KR20180093693A - Scroll compressor - Google Patents

Abstract

According to the present invention, a scroll compressor comprises: a casing; a fixing scroll placed to be fixated to the inside of the casing; a turning scroll forming a compression chamber by being engaged with the fixing scroll; an injection flow path formed by penetrating through the fixing scroll; and an injection valve assembly placed in the injection flow path. The injection valve assembly comprises: an elastic member of which one end is supported by an internal wall of the injection flow path; a valve member coupled to the other end of the elastic member; and a hollow member provided with a hollow portion through which a fluid passes, and inserted into the injection flow path to close the injection flow path when being in contact with the valve member. Therefore, a back flow of refrigerant is prevented, and dead volume in a flow path can be reduced.

Description

[0001] SCROLL COMPRESSOR [0002]

The present invention relates to a scroll compressor in which a refrigerant circulating in a refrigeration cycle is bypassed to an intermediate compression chamber to vary the capacity of the compressor.

Generally, the hermetic compressor is provided with a driving motor for generating a driving force in an inner space of a sealed casing and a compression section for receiving a driving force of the driving motor to compress the fluid.

The scroll compressor, which is one type of the hermetic compressor, is provided with a non-orbiting scroll in the inner space of the casing, and a non-orbiting scroll in which the orbiting scroll is engaged with the orbiting scroll, A compressor, an intermediate pressure chamber, and a discharge chamber.

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 can smoothly connect suction, compression, and discharge strokes of the refrigerant to obtain stable torque.

The scroll compressor can be divided into a high-pressure type and a low-pressure type depending on the type of refrigerant being supplied to the compression chamber. In the high-pressure scroll compressor, the refrigerant is sucked directly into the suction chamber without passing through the inner space of the casing, and is discharged through the inner space of the casing. Most of the inner space of the casing forms a high-pressure portion as a discharge space. On the other hand, in the low-pressure scroll compressor, the refrigerant is indirectly sucked into the suction chamber through the inner space of the casing, and the inner space of the casing is divided into a low-pressure portion as a suction space and a high-

On the other hand, the scroll compressor can be divided into a fixed capacity type and a variable capacity type by a circulation system of the refrigerant. In the fixed capacity type compressor, the entire refrigerant discharged from the compressor is circulated through a refrigeration cycle including a condenser, an expander and an evaporator, and is sucked to the suction side of the compressor. On the other hand, a part of the refrigerant discharged from the variable capacity compressor is bypassed The refrigerant flows into the intermediate compression chamber of the compressor again and the remaining refrigerant is sucked to the suction side of the compressor through the refrigerant cycle in turn. The variable capacity type scroll compressor typically has an injection pipe connected to the outlet of the condenser and communicating the injection pipe with the intermediate compression chamber of the compressor. The circulation direction of the refrigerant in the middle of the injection pipe or at the branch point of the injection pipe A valve for controlling the flow rate of the refrigerant is provided.

However, when a valve is provided in the injection pipe, the space inside the injection pipe from the compression chamber to the valve position is kept in communication with the compression chamber in the compression process. Such a space inside the injection tube has a problem that it acts as a dead body in the course of compression.

Further, when the valve is formed in the hermetic compressor in order to reduce the carcass space, the strength of the component may be degraded as more processing steps such as penetrating the components are added. In addition, the valve structure formed inside the hermetic compressor needs to be configured to facilitate assembly.

SUMMARY OF THE INVENTION A first object of the present invention is to provide a scroll compressor in which a valve assembly for preventing reverse flow of an injection refrigerant is mounted inside a fixed scroll to reduce the carcass of the compression chamber.

A second object of the present invention is to provide a valve assembly capable of minimizing the machining process of the injection flow path formed inside the fixed scroll and being easily assembled by the insertion fitting of the components while achieving gastric reduction will be.

In order to achieve the first object of the present invention, a scroll compressor according to the present invention includes: a fixed scroll and a orbiting scroll which are meshed with each other to form a compression chamber; An injection flow passage formed through the fixed scroll or the orbiting scroll; And an injection valve assembly for selectively communicating the injection passage and the compression chamber, wherein the injection valve assembly comprises: an elastic member having one end supported by an inner wall of the injection passage; A valve member coupled to the other end of the elastic member; And a hollow member through which the fluid passes. The hollow member is inserted into the injection channel so that the injection channel is closed when the valve member is brought into contact.

In order to achieve the second object of the present invention, the valve member includes: a sealing portion closing the injection flow path by contact with the hollow member; And a housing portion connected to the hermetically sealed portion and accommodating at least a part of the elastic member.

In addition, the injection channel may be formed with a guide portion protruding from the inner circumferential surface so as to slide with the receiving portion. The valve member may have a stopper portion protruding from the outer circumferential surface of the valve member so as to be caught by the end portion of the guide portion.

On the other hand, the accommodating portion may include a plurality of accommodating legs spaced apart from each other. Further, the thickness of the accommodating leg may be made smaller than the diameter of the communication hole communicating the injection passage and the compression chamber.

On the other hand, the receiving portion may have a recess portion which is recessed at the outer peripheral surface of the receiving portion. Alternatively, the receiving portion may be formed to have an outer diameter larger than the sealed portion.

According to the present invention constituted by the solution means described above, the following effects can be obtained.

In the scroll compressor of the present invention, since the injection valve assembly is disposed in the injection flow path formed inside the fixed scroll, the backflow prevention is realized, and the internal volume of the injection flow path is minimized to increase the compression efficiency .

Second, the injection valve assembly of the present invention is formed such that the elastic member, the valve member, and the hollow cylinder are inserted into the injection flow passage formed through the fixed scroll in order to be assembled, thereby improving assembling convenience. In addition, factors that may lower the component strength such as additional machining of the fixed scroll can be eliminated.

In addition, since the guide portion is formed in the injection flow path and the stopper portion is formed in the valve member, the reliability of the operation of the valve member can be ensured repeatedly.

On the other hand, since the accommodating portion of the valve member is constituted by a plurality of accommodating portion legs and the width of the accommodating portion leg is smaller than the communicating portion, the fluid chamber is formed between the valve chamber formed inside the injection passage with respect to the hollow member, It can be moved smoothly.

On the other hand, since the recessed portion is provided on the outer circumferential surface of the receiving portion of the valve member or the accommodating portion has a larger outer diameter than the closed portion, the communication space between the valve chamber on the inner side of the hollow cylinder and the compression chamber on which the fluid is compressed .

1 is a longitudinal sectional view showing a part of a scroll compressor according to the present invention.
FIG. 2 is a perspective view of the fixed scroll shown in FIG. 1; FIG.
3 is a systematic view showing a refrigeration cycle provided with the scroll compressor shown in FIG.
FIG. 4A is a schematic cross-sectional view illustrating a state in which an injection valve assembly provided in a scroll compressor according to the present invention closes an injection flow path. FIG.
FIG. 4B is a schematic cross-sectional view showing the injection valve assembly shown in FIG.
5 is a perspective view showing a valve member according to an embodiment of the present invention;
6 is a perspective view showing a valve member according to another embodiment of the present invention;
7A is a perspective view showing a valve member according to another embodiment of the present invention.
FIG. 7B is a schematic cross-sectional view showing a part of a fixed scroll equipped with an injection valve assembly having a valve member shown in FIG. 7A. FIG.

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

In other respects, the same or similar reference numerals are given to the same or similar components to those of the previous embodiment, and a duplicate description thereof will be omitted.

It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention, It should be understood that it includes water and alternatives.

FIG. 1 is a longitudinal sectional view showing a part of a scroll compressor 100 according to the present invention, and FIG. 2 is a perspective view showing an incision of the fixed scroll shown in FIG. The scroll compressor 100 according to the present invention may be, for example, a high pressure scroll compressor.

1 and 2, a scroll compressor 100 according to the present invention includes a casing 110 having a closed inner space, a main frame 120 fixed to both upper and lower inner spaces of the casing 110, (Not shown). The main frame 120 may further include a driving motor 130 mounted between the main frame 120 and the sub frame to generate a rotational force.

The fixed scroll 140 is fixed to the upper surface of the main frame 120 and is directly coupled to the gas suction pipe SP. The fixed scroll 140 is coupled to the main frame 120 to form a compression chamber P And an orbiting scroll (150) pivotally mounted on the upper surface. Further, it may further include an Oldham's ring (not shown) installed between the orbiting scroll 150 and the main frame 120 to rotate the orbiting scroll 150 while preventing the orbiting scroll 150 from rotating.

The closed space of the casing 110 can be partitioned into the upper space S1 and the lower space S2 by the main frame 120 and the fixed scroll 140. [ In this embodiment, both the upper space S1 and the lower space S2 maintain a high pressure state, and the bottom surface of the lower space S2 of the casing 110 can be filled with oil. The gas suction pipe SP is coupled to the upper space S1 of the casing 110 and the gas discharge pipe DP is connected to the lower space S2 of the casing 110. [

The main frame 120 is formed with a shaft hole 121 at the center thereof and an oil pocket 122 is formed at an upper end of the shaft hole 121 so as to collect oil picked up through a rotation shaft 132 . The back pressure groove 123 may be formed on the upper surface of the main frame 20 so as to form a back pressure chamber S3 having a part of the refrigerant sucked and a part of the oil sucked and having an intermediate pressure. A sealing groove (not shown) may be annularly formed on the inside of the back pressure groove 123 so that the sealing member 160 is inserted to seal the oil accumulated in the oil pocket 122 to maintain a high pressure. The back pressure chamber S3 is formed by combining the back pressure groove 123 of the main frame 120 with the longitudinal plate portion 141 of the fixed scroll 140 to be described later and the longitudinal plate portion 151 of the orbiting scroll 150 to be described later, .

The driving motor 130 includes a stator (not shown) having a coil 131 fixed to the inside of the casing 110 so as to receive power from the outside and a stator (Not shown) that rotates while operating. The rotating shaft 132 may further include a rotating shaft 132 coupled to the rotor by heat shrinkage to transmit the rotating force of the driving motor 130 to the orbiting scroll 50. The rotary shaft 32 is formed with an oil passage 132a in the axial direction and an oil pump (not shown) may be installed at the lower end of the oil passage 132a.

The stationary scroll 140 is formed in a spiral shape by a fixed wraps 142 forming a pair of two compression chambers P on the bottom surface of the hard plate portion 141. A gas suction pipe SP is formed on the side surface of the hard plate portion 141, A suction port 143 for direct communication can be formed. A discharge port 144 for discharging the compressed refrigerant into the upper space S1 of the casing 110 may be formed at the center of the upper surface of the hard plate portion 141. [

The compression chamber P and the back pressure chamber S3 are communicated with each other between the laps constituting the compression chamber P on the bottom surface of the hard plate portion 141, that is, the surface forming the thrust bearing surface together with the orbiting scroll 150 The back pressure passage 145 may be formed.

2, the orbiting scroll 150 includes a fixed lap 142 of the fixed scroll 140 and a orbiting wrap 152, which forms a pair of two compression chambers P, on the upper surface of the rigid plate 151 And may be formed into a spiral shape. A boss 153 may be formed at the center of the bottom of the hard plate 151 to receive the power of the driving motor 130 by being coupled to the rotary shaft 132.

The scroll compressor (100) of the present invention operates as follows.

When power is applied to the driving motor 130, the rotating shaft 132 rotates together with the rotor to transmit rotational force to the orbiting scroll 150. The orbiting scroll 150 receives the rotational force and rotates by an eccentric distance from the upper surface of the main frame 120 by the overhanging so that the orbiting scroll 142 of the fixed scroll 140 and the orbiting scroll 150 of the orbiting scroll 150 A pair of compression chambers P continuously moving between the wraps 152 are formed. The compression chamber (P) is moved to the center by the continuous swirling motion of the orbiting scroll (150) and the volume thereof is reduced to compress the refrigerant sucked in.

At the same time, the oil filled in the casing 110 is pumped by the oil pump (not shown) provided at the lower end of the rotating shaft 132. The oil is sucked up to the upper end through the oil passage 132a of the rotary shaft 132 and a part of the oil is supplied to the water spouting hole 121 of the main frame 120. On the other hand, some of the oil is scattered at the upper end of the rotating shaft 132 and flows into the back pressure chamber S3 of the main frame 120. [ The oil introduced into the back pressure chamber S3 pressurizes the orbiting scroll 150 to rise toward the fixed scroll 140 so that the stationary wrap 142 and the orbiting wrap 152 are moved to the respective hard plates 151 and 141, thereby sealing the compression chamber (P).

In this state, the orbiting scroll 150 continuously compresses the refrigerant while swirling, and a part of the refrigerant to be compressed moves to the back pressure chamber S3 through the back pressure passage 145, The pressure is kept constant. As the outlet of the back pressure passage 145 alternately communicates with the both compression chambers P with the orbiting wrap 152 therebetween, the oil is uniformly supplied to the compression chambers P through the back pressure passage 145 .

3 is a schematic diagram showing a refrigeration cycle 10 provided with the scroll compressor 100 shown in FIG. When the scroll compressor (100) of the present invention is constituted by a variable capacity type, the refrigerant is supplied to the intermediate compression chamber of the compressor in the middle of the refrigeration cycle (10) including the scroll compressor (100) The compression capacity of the scroll compressor can be increased by increasing the amount of the refrigerant that is re-introduced and compressed.

 3, in the middle of the refrigerant pipe 13 connecting the condenser 11 and the inflator 12 of the refrigeration cycle, that is, at the outlet side of the condenser 11, the injection pipe 14 is branched , And the injection pipe (14) is connected to the scroll compressor (100). A bypass valve 15 for controlling the flow of the refrigerant may be installed in the middle of the injection pipe 14 or at a point where the injection pipe 14 is branched.

2, the injection pipe 14 is connected to the fixed scroll 140 through the casing 110 of the scroll compressor 100 of the present invention. The fixed scroll (140) is provided with an injection flow passage (146) which is formed to penetrate the inside of the fixed scroll and communicates with the intermediate compression chamber.

With this configuration, when the capacity of the scroll compressor 100 of the present invention is insufficient, the refrigerant circulating in the refrigeration cycle (hereinafter also referred to as "fluid") can be injected into the compression chamber. That is, the refrigerant is introduced into the compression chamber during the expansion or condensation of the refrigeration cycle during the compression process, thereby improving the overall capacity.

However, in the case of the conventional scroll compressor, the injection pipe 14 and the injection flow path 146 to the point where the bypass valve 15 is installed are communicated with the compression chamber P, Space is lost in the compression process, and the compression efficiency is lowered. Particularly, at low load / low speed operation in which the compressor flow rate is small, the ratio of carcass to the compressed flow rate becomes higher, which can be a bigger problem.

The injection valve assembly 170 included in the scroll compressor 100 of the present invention isolates the compression chamber P from the piping such as the injection pipe 14 and the injection flow path 146 to be described later, In particular, it can be positioned as close to the compression chamber (P) as possible to minimize the body mass.

In the scroll compressor (100) of the present invention, the injection channel (146) serves to communicate the injection pipe (14) and the compression chamber (P). Specifically, the injection flow path 146 includes a radial flow path 146a extending in the radial direction of the rotary shaft 132 in the longitudinal section 141 of the fixed scroll 140, And the axial flow path 146b extended to be connected to the compression chamber P located at the second end portion of the compression chamber P intersect with each other. At this time, the axial flow path 146b can communicate with the intermediate compression chamber having the intermediate pressure.

4A is a schematic cross-sectional view showing an injection valve assembly 170 provided in a scroll compressor 100 according to the present invention in a state in which an injection flow path 146 is closed. 4A, the injection valve assembly 170 of the present invention includes an elastic member 171, a valve member 172, and a hollow member 173.

The elastic member 171 is elastically deformed by the pressure of the fluid flowing through the injection flow path 146 and functions to open and close the injection flow path 146. One end of the elastic member 171 is supported by the inner wall of the injection channel 146 and the other end is supported by the valve member 172 to be described later. Respectively. 4A, the elastic member 171 may be supported at an end of the radial passage 146a, which is an inner wall facing the radial direction of the rotary shaft 132. [

The elastic member 171 can be inserted into the injection flow path 146, and can be made of a coil spring as shown in FIG. 4A. The elastic member 171 is supported by the inner wall of the injection flow path 146 and the valve member 172 so that the elastic member 171 is resiliently compressed when the valve member 172 described later is pressed by the fluid flowing into the injection flow path 146. [ .

On the other hand, the valve member 172 serves to close the injection flow path 146 by contact with a hollow member 173 described later. 4A, the valve member 172 is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the injection path 146, and the valve member 172 is formed to be movable by the pressure of the fluid flowing in the injection path 146. [ . A more detailed structure and function of the valve member 172 will be described later by dividing the embodiment.

In this embodiment, the valve member 172 can be moved along the extension direction of the injection flow path 146, at which time the other end of the elastic member 171 is supported by the valve member 172. Accordingly, the valve member 172 can be elastically moved by the fluid flowing into the compression chamber P from the outside.

Specifically, when the force applied to the valve member 172 by the pressure of the inflow fluid is larger than the elastic force supported by the elastic member 171, the valve member 172 is moved along the direction in which the fluid is introduced. The moved valve member 172 can be returned to its original position by the restoring force of the compressed elastic member 171 when fluid does not flow or the force due to the pressure is smaller than the elastic force .

The hollow member 173 functions to form a space in which the valve member 172 moves in the injection flow path 146 and closes the injection flow path 146 by contact with the valve member 172. [ The hollow member 173 has a hollow portion 173a, which may be a hollow cylinder in this embodiment.

The hollow member 173 is formed in a shape that can be inserted and fixed in the injection flow path 146 and has a hollow portion 173a that can be formed to allow the fluid to pass therethrough when the hollow member 173 is inserted into the injection flow path 146 It is possible to perform such a function.

In this embodiment, the hollow member 173 is disposed so as to be in contact with the valve member 172 by the urging force of the elastic member 171. The hollow member 173 can be inserted and mounted on the inner circumferential surface of the injection flow path 146 after the elastic member 171 and the valve member 172 are inserted into the end side of the injection flow path 146. At this time, May be formed through the hollow member 173 in parallel with the advancing direction of the injection flow path 146.

When the hollow member 173 is inserted and fixed, the inside of the injection channel 146 in which the valve member 172 and the elastic member 171 are present can be the valve chamber 146c. The end of the hollow portion 173a closed by the valve member 172 can be an inlet.

 FIG. 4B is a schematic cross-sectional view showing the injection valve assembly 170 shown in FIG. 4A in a state where the injection valve 146 is open. Hereinafter, the operation of the injection valve assembly 170 according to the present invention will be described with reference to FIGS. 4A and 4B.

First, the state shown in FIG. 4A is a state in which the fluid does not flow into the injection channel 146. At this time, the hollow member 173 and the valve member 172 come into contact with each other, and the injection flow path 146 is kept closed. The valve member 172 can be pressed toward the hollow member 173 by keeping the elastic member 171 compressed in a predetermined level when the hollow member 173 is inserted and fixed.

Next, the state shown in FIG. 4B is a state in which the fluid flows into the injection flow path 146. The inflow fluid presses the valve member 172 outwardly beyond the elastic force of the elastic member 171, and the valve member 172 moves in the fluid flow direction. When the hollow member 173 and the valve member 172 are separated from each other, the fluid can pass through the hollow portion 173a and flow into the space between the valve member 172 and the injection flow path 146, The valve assembly 170 is in an open state.

The scroll compressor 100 according to the present invention is provided with the injection valve assembly 170 composed of the elastic member 171, the valve member 172 and the hollow member 173 described above, The injection flow path 146 is opened only when the refrigerant of the condenser is supplied, and the back flow of the refrigerant is prevented when the refrigerant of the condenser is not supplied.

The injection valve assembly 170 is disposed at a position closest to the compression chamber P from the condenser 11 of the refrigeration cycle 10 to the compression chamber P of the scroll compressor 100 of the present invention, So that the carcass generation due to the increase in the piping space communicating with the compression chamber P can be minimized. In addition, the hollow member 173 inserted into the injection flow path 146 further reduces the space occupied by the refrigerant, thereby contributing to a further reduction in the carcass.

In addition, by preventing the fluid in the compression chamber P from flowing back to the injection channel 146, a part of the oil in the compression chamber P flows out to the injection channel 146, Can be prevented.

4A and 4B, the valve member 172 included in the injection valve assembly 170 of the present invention may include a sealing portion 172a and a receiving portion 172b. The sealing portion 172a serves to close the hollow portion 173a by the contact with the hollow member 173 described above and the receiving portion 172b functions to engage with the elastic member 171. [

The sealing portion 172a covers the end face of the hollow cylindrical member 173 so as to close the hollow portion 173a. To this end, in the present embodiment, the sealing portion 172a is formed in a cylindrical shape having a larger diameter than the hollow portion 173a having a circular cross section.

The cylindrical sealing portion 172a is formed to have a smaller diameter than the inner diameter of the injection channel 146 or the outer diameter of the hollow member 173. This is for allowing the inflow fluid to pass between the sealing portion 172a and the inner peripheral surface of the injection channel 146 when the valve member 172 is separated from the hollow member 173 by the pressure of the fluid.

The accommodating portion 172b of the valve member 172 according to the present invention extends from the sealing portion 172a so as to enclose at least a part of the elastic member 171. [ In this embodiment, the accommodating portion 172b is formed so as to surround the outer peripheral surface of the elastic member 171 formed of a cylindrical coil spring. As a result, the valve member 172 is engaged with the outer peripheral surface of the elastic member 171, and may have a cap shape.

On the other hand, the length in which the accommodating portion 172b extends is set so that the length of the length of the accommodating portion 172b is set such that the elastic member 171 is in contact with the inner wall of the injection flow path 146 in which the elastic member 171 is supported, The member 172 can be designed to be stopped.

According to the structure of the valve member 172 as described above, the injection valve assembly 170 of the present invention is provided with the elastic member 171, the valve member 172, and the hollow member 173 In turn, can be formed. In other words, since it is not required to process the fixed scroll 140 in order to form a separate valve chamber 146c in the injection flow path 146, it is easy to manufacture. Further, the factor that may lower the strength of the fixed scroll 140 forming the compression chamber P can be eliminated, and the structural reliability of the scroll compressor 100 according to the present invention can be improved.

The injection valve assembly 170 of the scroll compressor 100 according to the present invention is installed inside the fixed scroll 140 and can be easily formed without deteriorating the efficiency of the compressor. Hereinafter, the structure and characteristics of forming the refrigerant passage in the injection valve assembly 170 of the present invention will be described.

5 is a perspective view showing a valve member 172 according to an embodiment of the present invention. The diameter of the sealing portion 172a constituting the valve member 172 in the present embodiment is made equal to the outer diameter of the receiving portion 172b or larger than the outer diameter of the receiving portion 172b as shown in FIG. .

4A and 4B, the injection flow path 146 of the scroll compressor 100 according to the embodiment of the present invention includes a guide portion 146d. In this embodiment, the guide portion 146d guides the movement of the valve member 172 and functions to smoothly flow the fluid when the injection channel 146 is opened.

The guide portion 146d provided according to the present embodiment can be formed to protrude from the inner circumferential surface of the injection flow path 146. As a result, the guide portion 146d can be formed by injecting the injection fluid 146 ) Holes or grooves having an inner diameter smaller than the inner diameter can be formed.

The guide portion 146d may be formed near the inner wall of the injection flow path 146 in which the elastic member 171 is supported. The accommodating portion 172b of the valve member 172 encloses the elastic member 171 so that the accommodating portion 172b and the guide portion 146d can be brought into contact with each other. 4A and 4B, when the valve member 172 is moved by the fluid pressure and the elastic force of the elastic member 171, the receiving portion 172b slides on the guide portion 146d and is moved The movement path can be accurately guided.

6 is a perspective view showing a valve member 272 according to another embodiment of the present invention. When the guide portion 146d is formed in the injection flow path 146 of the fixed scroll 140, the valve member 272 according to another embodiment of the present invention is hooked on the end portion of the guide portion 146d, And a stopper portion 272c that can be secured.

Since the guide portion 146d is formed to protrude from the inner circumferential surface of the injection flow path 146, steps different in inner diameter from each other can be formed in the injection flow path 146. [ As shown in Fig. 6, the stopper portion 272c formed on the valve member 272 can be formed to protrude so as to be caught at the portion where the stepped portion is formed. The stopper portion 272c is engaged with the guide portion 146d in a state as shown in the figure so that the valve member 272 can be supported.

In this manner, the guide portion 146d is formed in the injection flow path 146, and the stopper portion 272c is formed in the valve member 272 of the injection valve assembly 170, so that the valve member 272 is connected to the injection flow path 146 Lt; RTI ID = 0.0 > and / or < / RTI > In addition, when the strong pressure of the fluid is repeatedly applied to the valve member 272, the risk that the receiving portion 272b of the valve member 272 may collide with the inner wall of the injection channel 146 and is damaged can be reduced . Therefore, the reliability of the repeated operation of the valve member 272 can be improved.

As described above, the injection flow path 146 formed in the fixed scroll 140 of the scroll compressor 100 of the present invention may include the radial flow path 146a and the axial flow path 146b, And a communication hole 146e may be formed at a point where they communicate with each other. When the injection valve assembly 170 of the present invention is positioned so as to open the injection flow path 146, the communication hole 146e must be secured in an open state that is not closed by other components.

In one embodiment and another embodiment of the present invention, the communication port 146e may be located where the valve member 172 and the injection flow path 146 are not in contact with each other. For example, it may be formed on the outer circumferential surface of the valve chamber 146c formed between the guide portion 146d and the hollow member 173.

However, the injection flow path 146 formed through the conventional fixed scroll 140 is formed in such a manner that the radial flow path 146a is formed so as not to be deeper than the position of the communication hole 146e communicating with the axial flow path 146b Lt; / RTI > That is, there may be no extra space in which the valve member 172 and the elastic member 171 are inserted and the communicating port 146e can be exposed to the valve chamber 146c. When the valve member 172 is inserted in this state, there may not be a sufficient gap for refrigerant flow between the valve member 172 and the communication hole 146e, as shown in Figs. 4A and 4B. Hereinafter, the structure of the valve member 172, which is configured to ensure the open state even at the position of the communication hole 146e as described above, will be described.

5 and 6, the receiving portions 172b and 272b of the valve member 172 and 272 of the present invention may be formed of a plurality of receiving legs. The receiving legs may be spaced apart from each other to enclose the elastic member 171. Each of the receiving legs can be coupled with and supported by the sealing portion 172a of the valve member 172. [ As shown in Figs. 5 and 6, the accommodating legs have a circular cross-section having a predetermined thickness, and may be formed of three, for example.

The fluid introduced when the valve member 172 is moved and the injection channel 146 is opened can be passed from the outer periphery side to the inner periphery side of the accommodating portion 172b through the space of the valve chamber 146c . The fluid passes through the space on the inner circumferential side of the accommodating portion 172b formed of the coil spring and then to the outer circumferential side of the accommodating portion 172b so that it can enter the compression chamber P through the communication hole 146e.

At this time, it is preferable that the receiving leg is inserted at an angle that does not close the communication hole 146e when the valve member 172 is inserted, but in the repeated opening and closing process, the valve member 172 is rotated by the torque of the elastic member 171 ) To close the communication hole 146e.

Therefore, the plurality of accommodating legs can be formed so that the width in the circumferential direction is smaller than the diameter of the communication hole 146e. Thus, even if the receptacle leg is rotated to the position where the communication hole 146e is present, the open state of the communication hole 146e can be maintained.

Further, the accommodating portion 172b made of a plurality of accommodating legs may have a recess portion 272d formed to be recessed on the outer circumferential surface. 6, the recessed portion 272d is formed at a position where the communication hole 146e can be placed among the outer peripheral surfaces of the receiving portion legs so that the receiving portion leg is positioned so as to cover the communication hole 146e The space is opened in the circumferential direction so that the communication state between the communication port 146e and the valve chamber 146c can be maintained.

7A is a perspective view showing a valve member 372 according to another embodiment of the present invention. The valve member 372 may include a sealing portion 372a and a receiving portion 372b and the receiving portion 372b may be formed to have an outer diameter larger than that of the sealing portion 372a.

The valve member 372 of another embodiment of the present invention is characterized in that it can be applied without separately processing the injection channel 146 when the inner diameter of the injection channel 146 is constant. That is, another embodiment of the present invention may be suitable for the case where the guide portion 146d of the above-described embodiment is not machined or machining is difficult.

Referring to FIG. 7A, the valve member 372 according to another embodiment of the present invention may include an accommodating portion 372b formed of a plurality of accommodating legs as in the previous embodiment. However, the outer diameter of the receiving portion 372b formed by each receiving portion leg may be larger than the outer diameter of the sealing portion 372a. To this end, the plurality of receiving portion legs may extend from the sealing portion 372a, And an extended portion 372e having an increased outer diameter.

7B is a schematic cross-sectional view showing a part of the fixed scroll 140 on which the injection valve assembly 170 having the valve member 372 shown in FIG. 7A is mounted. As shown in FIG. 7B, when the valve member 372 is moved to be separated from the hollow member 173, the fluid flows into the valve chamber 146c through the hollow portion 173a. The fluid passes around the sealing portion 372a having a smaller diameter than the injection flow path 146 and flows between the plurality of extended portions 372e and flows toward the inner circumferential side of the accommodating portion 372b of the valve member 372. [ The fluid may pass through a space where the elastic member 171 is present and again pass through a plurality of receptacle legs to flow into the communication hole 146e and be supplied into the compression chamber P. [

When the valve member 372 according to another embodiment of the present invention is applied, there is no need to further process the injection channel 146 or insert the structure, in order to form the stepped structure like the guide portion 146d . Therefore, there is an advantage that a flow path structure in which the refrigerant communicates to the compression chamber P when the valve member 372 is opened can be easily manufactured.

The valve member 172 and 272 according to one embodiment of the present invention and the valve member according to another embodiment of the present invention and the valve member 372 according to another embodiment of the present invention are provided in the fixed scroll 140 with the injection flow path 146 And the ease of manufacturing the valve member 172, 272, and 372, and the like.

The present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the scope of the present invention as defined in the following claims. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: refrigeration cycle 11: condenser
12: inflator 13: refrigerant tube
14: Injection pipe 15: Bypass valve
100: scroll compressor 110: casing
120: main frame 121: bearing hole
122: Oil pocket 123: Back pressure groove
130: drive motor 131: coil
132: rotation axis 132a:
140: fixed scroll 141, 151:
142: stationary lap 143: inlet
144: discharge port 145: back pressure passage
146: Injection flow path 146a:
146b: axial flow channel 146c: valve chamber
146d: guide portion 146e:
150: orbiting scroll 152: orbiting wrap
153: boss portion 160: sealing member
170: Injection valve assembly 171: Elastic member
172: valve member 172a: sealing member
172b: receiving portion 173: hollow member
173a: hollow portion 272: valve member
272b: receiving portion 272c: stopper portion
272d: recess portion 372: valve member
372a: sealing part 372b:
372e: Extended portion

Claims (10)

Casing;
A fixed scroll positioned to be fixed inside the casing;
A orbiting scroll which forms a compression chamber by engaging with the fixed scroll;
An injection flow passage formed through the fixed scroll to introduce fluid outside the casing into the compression chamber; And
And an injection valve assembly positioned inside the injection path to selectively communicate the injection path and the compression chamber,
Wherein the injection valve assembly includes:
An elastic member having one end supported by an inner wall of the injection path;
A valve member coupled to the other end of the elastic member and adapted to be moved by a pressure of the fluid; And
And a hollow member having a hollow portion through which the fluid is passed, the hollow member being inserted into the injection flow passage and closing the injection flow passage when the valve member is in contact with the valve member. The method according to claim 1,
Wherein the valve member comprises:
A sealing part formed to contact the end surface of the hollow member to close the injection path; And
And a housing portion extending from the closed portion to enclose at least a part of the elastic member. 3. The method of claim 2,
Wherein the injection channel is formed with a guide portion protruding from an inner circumferential surface so as to slide with the accommodating portion. The method of claim 3,
Wherein the valve member includes a stopper portion protruding from the outer circumferential surface of the valve member so as to be caught by the end portion of the guide portion. 3. The method of claim 2,
Wherein the accommodating portion includes a plurality of accommodating legs spaced from each other along a circumference of the elastic member. 6. The method of claim 5,
A communication port communicating with the compression chamber is formed in the injection channel,
And the thickness of the receiving leg is smaller than the diameter of the communicating hole. 3. The method of claim 2,
Wherein the accommodating portion has a recess portion which is recessed at an outer peripheral surface of the accommodating portion. 3. The method of claim 2,
And the receiving portion is formed to have an outer diameter larger than that of the closed portion. Casing;
A fixed scroll positioned to be fixed inside the casing;
A orbiting scroll which forms a compression chamber by engaging with the fixed scroll;
An injection pipe connected to a condenser outside the casing and passing through the casing and mounted on the fixed scroll;
An injection flow passage formed in the fixed scroll portion so as to communicate with the compression chamber and the injection pipe; And
And an injection valve which is operated to communicate the injection path with the compression chamber by the pressure of the fluid flowing from the condenser and is located at the end of the injection path on the side of the compression chamber. 10. The method of claim 9,
Wherein the injection valve comprises:
A valve chamber having a space communicating with the compression chamber and having an inlet communicating with the injection channel;
A valve member mounted inside the valve chamber to open and close the inlet; And
And an elastic member elastically supported on the valve chamber and the sealing member, respectively, so that the inlet is opened by the hydraulic pressure of the fluid.

Images