KR101852448B1 - Swash plate type compressor - Google Patents

Abstract

The present invention relates to a swash plate type compressor in which the opening and closing core 520 and the pressure transmitting rod 530 are separately formed and coupled to each other and the opening and closing core 520 and the pressure transmitting rod 530 are coupled A suction check valve 500 having a strain relieving portion 540 for allowing relative movement between the pressure transmitting rod 530 and the opening and closing core 520 so that the relative deformation between the core 520 and the pressure transmitting rod 530 can be relaxed, ). ≪ / RTI > Such a swash plate type compressor can ensure smooth movement of the opening / closing core 520 or the pressure transmitting rod 530 due to the strain relieving portion 540, thereby reducing the performance of the suction check valve 500, .

Description

[0001] SWASH PLATE TYPE COMPRESSOR [0002]

The present invention relates to a swash plate type compressor, and more particularly, to a swash plate type compressor which compresses a refrigerant sucked from an external refrigerant line by a plurality of reciprocating pistons in accordance with rotation of a swash plate, And the opening degree of the suction check valve mounted between the chambers can be appropriately adjusted according to the amount of refrigerant sucked from the refrigerant line.

Generally, compressors that serve to compress refrigerant in automotive cooling systems have been developed in various forms. Such a compressor includes a reciprocating type in which compression is performed while a refrigerant is compressed and a rotary type in which compression is performed while rotating. In the reciprocating type, there are a crank type in which the driving force of the drive source is transmitted to a plurality of pistons by using a crank, a swash plate type in which the swash plate is transmitted by a swash plate installed shaft, a wobble plate type in which a wobble plate is used, There are vane rotary type, scroll type using revolving scroll and fixed scroll.

Among the above various types of compressors, the swash plate type compressor is driven according to on / off of the air conditioner switch. When the compressor is driven, the temperature of the evaporator is lowered and the temperature of the evaporator is raised when the compressor is stopped.

On the other hand, as the swash plate type compressor, there are fixed capacity type and variable capacity type. These compressors are driven by receiving power from the rotational force of the engine of the vehicle. In the fixed capacity type, an electromagnetic clutch is provided to control the operation of the swash plate type compressor. However, in the case of the fixed capacity type having the electromagnetic clutch, there is a problem that the RPM of the vehicle flows when the compressor is driven or stopped, thereby hindering stable vehicle operation.

Therefore, in recent years, a variable displacement type, which is not provided with a clutch, is always driven with the driving of the engine of the vehicle, and can vary the discharge capacity by changing the inclination angle of the swash plate, is widely used. In such a variable displacement swash plate type compressor, a pressure control valve for adjusting the inclination angle of the swash plate is generally used for adjusting the refrigerant discharge amount.

However, in the conventional variable displacement swash plate type compressor, when the suction amount of the refrigerant is reduced, there is a problem that vibration occurs in the suction port and pulsation or roaring occurs.

In order to solve such a problem, a suction check valve 150 shown in FIG. 1 has been proposed in order to gradually change the flow area of the suction port when the suction amount of refrigerant is small to avoid abrupt suction.

The suction check valve 150 includes a case 151, an opening and closing core 153 and a recoil spring 155. The case 151 is a cylindrical body that is opened to serve as a body of the valve 150 And an opening cover 169 is fitted around the opened suction port 161. A discharge port 163 is formed at one side of the side wall surface at a right angle to the suction port 161. [

The opening and closing core 153 is a cylindrical plunger which is installed inside the case 151 so as to be movable in an axial direction and moves up and down inside the case 151 in accordance with the refrigerant pressure applied to the suction port 161, To the discharge port 163, as shown in FIG.

The recoil spring 155 is installed to elastically support the opening / closing core 153 against the pressure of the refrigerant flowing into the case 151 through the suction port 161. The refrigerant pressure The opening / closing core 153 is brought into close contact with the cover 169 so that the suction port 161 can be closed.

The axial groove 171 is formed on the outer peripheral surface of the opening and closing core 153 so that the refrigerant can flow through the axial groove 171 even when the opening and closing core 153 is in close contact with the lid 169 So that a sudden change in the opening of the suction check valve can be prevented even if there is a sudden change in the refrigerant pressure applied to the suction port 161. [

However, since the conventional suction check valve 150 is configured to operate only by the differential pressure between the suction port and the suction chamber of the variable displacement swash plate type compressor, when the differential pressure between the suction port and the suction chamber exceeds a certain limit, Even when the maximum variable operation is not performed, the opening / closing core 153 can be opened to a maximum similar to the case of the maximum variable operation, so that the effect of preventing the occurrence of suction pulsation or noise is insignificant.

In order to solve this problem, in order to adjust the suction amount of the refrigerant flowing into the suction port through the suction check valve, the opening degree of the suction check valve is adjusted not only by the differential pressure between the suction port and the suction chamber but also by the crank chamber pressure An improved suction check valve 250 as shown in FIG. 2 has been proposed so that the occurrence of suction pulsation or roar can be prevented.

The improved suction check valve 250 is installed on the pipe 135 connecting the suction port (not shown) to the suction chamber 132 and is provided between the suction port 132 and the crank chamber 121 So that the opening degree can be controlled. At this time, a passage 136 connecting the crank chamber 121 and the conduit 135 is formed.

On the other hand, the above-described improved suction check valve 250 has a suction port 251a at one side thereof and a discharge port 251b communicating with the suction port 251a when the suction port 251a is opened, A case 251 having a guide hole 251d formed at one side thereof and a case 251 supported by the inside of the case 251 via a spring S so as to extend from the suction port 251a to the discharge port 251b An opening and closing core 252 for adjusting the flow of the refrigerant and a crank chamber 121 located inside the opening and closing core 252 so that the pressure of the crank chamber 121 can be applied to the inside of the opening and closing core 252, And a pressure transmitting rod 253 which is pressed by the pressure of the case 251 and moves up and down integrally with the opening and closing core 252 through the guide hole 251d of the case 251. [

In the case where the above-described improved suction check valve 250 is applied, when the pressure of the suction port is excessive in a state where the inlet port 251b is not maximally variable, the discharge port 251b can be adjusted to the maximum opening degree by the opening / closing core 252 The pressure of the crank chamber 121 acts on the opening / closing core 252 in a direction opposite to the pressure direction of the suction port, so that the final adjusted opening degree can be reduced. As a result, .

In the conventional improved suction check valve 250, the opening and closing core 252 and the pressure transmitting rod 253 are integrally formed. In forming the opening and closing core 252 and the pressure transmitting rod 353, Synthetic resin material was used to reduce pulsation. The opening and closing core 252 and the pressure transmitting rod 353 may be deformed to some extent and the opening and closing core 252 may not be accurately positioned on the inner surface of the case 251, 353 may not be accurately positioned in the guide hole 251d of the case 251 and may cause problems such as being pinched in the opening and closing core 252 or the pressure transmitting rod 353, There is a problem that the performance of the suction check valve may be deteriorated or the fixing phenomenon may occur, and further, the pulsation reduction effect may not be obtained.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide a pressure check valve of a suction check valve which is formed separately from an opening / closing core, The deformation relieving portion for relieving the relative deformation between the opening and closing core and the pressure transmitting rod is formed to ensure smooth movement of the opening and closing core or the pressure transmitting rod, It is an object of the present invention to provide a swash plate type compressor.

According to another aspect of the present invention, there is provided a swash plate compressor including a cylinder block having a plurality of cylinder bores formed therein, a front head disposed in front of the cylinder block and formed with a crank chamber, A rotary shaft mounted on the rotary shaft so as to be rotatable through one side of the rotary shaft; a rotary shaft integrally rotated with the rotary shaft; A swash plate installed so as to be able to vary the angle with respect to the rotation axis so that the swash plate can be adjusted; and a linear reciprocating motion, which is jointly connected to the edge of the swash plate, Thereby compressing the refrigerant sucked through the suction port, A plurality of pistons to be discharged and a plurality of pistons which are provided on a pipe connecting the suction port to the suction chamber, the suction port being formed at one side thereof and the discharge port communicating with the suction port being formed at the other side thereof, An opening / closing core which is supported on the inside of the case by a spring so as to control the flow of the refrigerant leading from the inlet to the outlet, And a pressure transmitting rod which is located inside the opening and closing core so as to be applied to the inside of the opening and closing core and which is pressurized by the pressure of the crank chamber and moves up and down integrally with the opening and closing core through the communication hole of the case Wherein the opening and closing core and the pressure transmitting rod are separately formed and coupled to each other, Characterized in that the strain relief portion to allow relative movement between the pressure transmitting rod and opening and closing the core group can be formed such that the relative deformation between the core and the opening and closing relief opening pressure transmission rod core and the pressure transmission rod, the engagement portion.

The coupling portion of the opening / closing core and the pressure transmitting bar may include an engaging protrusion protruding from the inside of the opening / closing core, and an engaging groove formed in the pressure transmitting bar in a shape corresponding to the engaging protrusion.

Preferably, the strain relief portion includes a spacing space formed between the coupling protrusion and the coupling groove.

Wherein the engaging projection has a cylindrical supporting piece protruding from the inside of the opening and closing core, and an outer diameter larger than the outer diameter of the supporting piece at an extension portion extending from the supporting piece, And a coupling piece formed so as to be inclined so that the outer diameter gradually decreases toward the delivery rod.

Wherein the coupling groove has an upper groove formed to be inserted into the upper surface of the pressure transmission rod so as to have an inner diameter larger than the outer diameter of the supporting piece and a groove extending from the upper groove and formed in a shape corresponding to the shape of the coupling piece, And a lower end groove formed to have an inner diameter larger than the outer diameter.

A coupling protrusion interface is formed between the support piece and the coupling piece, the coupling protrusion serving as a separation preventing jaw coupled to the coupling groove, and the coupling protrusion is coupled to the coupling groove between the upper groove and the lower groove It is preferable that an engaging groove interface that acts as a latching jaw against the engaging projection interface is formed.

Wherein the spacing space formed between the engaging projections and the engaging recesses has a first gap which is a space laterally spaced between the outer side surface of the supporting piece and the upper end groove and a second gap that is laterally spaced between the outer side surface and the lower end groove And a second gap which is a space formed between the first and second substrates.

According to the swash plate type compressor as described above, the pressure transmission rod of the suction check valve is formed separately from the opening / closing core, and relative movement between the opening / closing core and the pressure transmission rod is allowed at the engagement portion of the opening / closing core and the pressure transmission rod, By providing a strain relief portion for relieving the relative deformation of the transmission rods, smooth movement of the opening / closing core or the pressure transmission rods can be ensured, thereby preventing performance deterioration or sticking of the suction check valve.

1 is a perspective view showing a suction check valve employed in a conventional swash plate type compressor.
2 shows an improved suction check valve employed in a conventional swash plate compressor.
3 is a longitudinal sectional view of a swash plate type compressor according to the present invention, showing a swash plate inclined with respect to a rotation axis.
4 is a longitudinal sectional view of a swash plate compressor according to the present invention, showing a swash plate erected in a radial direction of a rotating shaft;
FIG. 5 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, in which the suction port of the suction check valve is closed; FIG.
6 is a view illustrating a strain relief portion of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention.
7 is a more detailed view of a strain relief portion of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention.
8 is a longitudinal sectional view of a suction check valve applied to a swash plate compressor according to an embodiment of the present invention, showing a state in which the suction port of the suction check valve is opened to the maximum.
FIG. 9 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, in which the suction port of the suction check valve is properly opened; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured by the present invention. Also, the thickness of the lines and the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms used are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be based on the entire contents of the present specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a vertical sectional view of a swash plate type compressor according to the present invention, in which a swash plate is inclined with respect to a rotation axis, FIG. 4 is a longitudinal sectional view of the swash plate type compressor according to the present invention, 5 is a longitudinal sectional view of a suction check valve applied to a swash plate compressor according to an embodiment of the present invention, in which the suction port of the suction check valve is closed, and FIG. 6 is a cross- FIG. 7 is a view showing a strain relieving portion of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, and FIG. 7 is a view showing a strain relief portion of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, 8 is a longitudinal sectional view of the suction check valve applied to the swash plate type compressor according to the embodiment of the present invention. FIG. 9 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to an embodiment of the present invention, showing a suction port of a suction check valve properly opened. FIG.

3 to 9, a swash plate compressor according to an embodiment of the present invention includes a housing 100, a rotary shaft 200, a swash plate 300, a plurality of pistons 400, (500).

3 and 4, the housing 100 includes a cylinder block 110, a front head 120, and a rear head 130. As shown in FIGS. Here, the cylinder block 110 is a tubular body disposed at an intermediate portion in the longitudinal direction of the housing 100, and a hollow portion is formed therein to house the plurality of pistons 400 as well as the rotary shaft 200 .

The front head 120 and the rear head 130 are cylinders for closing the open and close ends of the upper cylinder block 110. As shown in FIGS. 3 and 4, the front head 120 includes a cylinder block 110 So that the inclination adjusting mechanism 320 can be received while securing the crank chamber 121 which is the rotating space of the swash plate 300. [

The rear head 130 has a front end open toward the cylinder block 110 and includes a suction chamber 132 for supplying the refrigerant to the cylinder bore 111 of the cylinder block 110 during the suction stroke, A discharge chamber 134 through which the refrigerant in the cylinder bore 111 is discharged is formed. A suction port 131 and a discharge port (not shown), which are connected to the suction chamber 132 and the discharge chamber 134, respectively, are formed on an outer wall surface of the rear head 130. On the other hand, a suction check valve 500 is mounted on the channel 135 connecting the suction port 131 to the suction chamber 132.

3 and 4, the rotating shaft 200 is a means for transmitting the rotational driving force of the external driving source to the inside of the compressor. The rotating shaft 200 penetrates a central portion of the front head 120, And is rotatably mounted. A rotary pulley 140 is coupled to one end of a rotary shaft 200 exposed to the outside of the front head 120 and an external rotary driving force is transmitted to the rotary shaft 200 through the rotary pulley 140 The rotating shaft 200 is rotated.

3, the swash plate 300 is mounted on the rotary shaft 200 in an inclined state. The swash plate 300 is a member for converting the rotational driving force of the rotary shaft 200 into reciprocating linear motion of the piston 400, And rotates together with the rotating shaft 200. At this time, a plurality of shoes 310 are mounted in the circumferential direction of the swash plate 300, and the plurality of pistons 400 are slidably supported by the shoe 310 through the shoe 310.

In particular, the swash plate type compressor shown in FIGS. 3 and 4 is a variable displacement swash plate type compressor. The swash plate type compressor is installed such that the inclination angle of the swash plate 300 is variable, Is 90 DEG, the reciprocation motion of the piston 400 disappears, so that the rotation shaft 200 idles. Conversely, when the swash plate 300 is inclined with respect to the rotary shaft 200 as shown in FIG. 3, the piston 400 reciprocates in the cylinder bore 111 to compress the refrigerant.

The suction check valve 500 installed on the pipeline 135 between the suction port 130 and the suction chamber 132 through which the refrigerant flows from the outside is connected to the suction check valve 500 when the slope of the swash plate 300 approaches 90 °, The amount of inflow of the refrigerant becomes small, and on the contrary, when the inclination becomes smaller than 90 degrees, the inflow amount of the refrigerant increases, thereby increasing the opening degree.

The plurality of pistons 400 are means for compressing the refrigerant while reciprocating in the cylinder bore 111 by the swash plate 300. As shown in FIGS. 3 and 4, And is reciprocated linearly along the inner peripheral surface of the cylinder bore 111 of the cylinder block 110 by the rotation of the swash plate 300, The refrigerant sucked into the cylinder bore 111 through the discharge port 131 is discharged to an external refrigerant line through a discharge port (not shown) of the rear head 130.

In the swash plate type compressor according to the present invention, the suction check valve 500 whose opening degree is adjusted according to the amount of refrigerant flowing through the suction port 131 is connected to the suction chamber 131 through a pipe connecting the suction port 131 to the suction chamber 132 And includes a case 510, an opening and closing core 520, and a pressure transmitting rod 530, as shown in FIG. The suction check valve 500 mainly adjusts the opening degree of the opening and closing core 520 by the differential pressure between the suction port 131 and the suction chamber 132 of the rear head 130, The opening degree of the crank chamber 121 can be controlled more precisely by the differential pressure between the suction port 131 and the suction chamber 132 and the crank chamber 121. [ In order to precisely adjust the opening degree, the housing 100 is preferably formed with a passage 136 connecting the crank chamber 121 and the channel 135.

5, the case 510 is provided on the pipe 135 connecting the suction port 131 to the suction chamber 132. The suction port 131 is connected to the suction port 132, And an O-ring R for maintaining airtightness is provided between the case 510 and the duct 135. [

The case 510 is formed of a hollow cylinder such as a cylindrical body and has a suction port 511 formed at one side thereof and a discharge port 512 communicating with the suction port 511 formed at the other side thereof. And a communication hole 510b communicating with the passage 136 is formed in the other side. Here, the passage 136 is also communicated with a communication passage (not shown) communicating with the discharge chamber 134 via the variable control valve.

The lower end of the case 510 has a shape that is closed except for the communication hole 510b through which the pressure transmitting rod 530 can pass, and is open toward the suction port 131 And a suction port 511 which continuously forms a flow path with the suction port 131 is passed through the center of the lid 513. Therefore, when the suction port 511 is opened, the external refrigerant flowing into the suction port 131 enters the inside of the case 510 through the suction port 511.

The opening and closing core 520 is a means for interrupting the flow of the refrigerant passing through the inside of the case 510 so as to control the flow of the refrigerant from the inlet 511 of the case 510 to the outlet 512 The pressure of the refrigerant flowing through the suction port 511 of the case 510 (also the pressure of the suction port 131) and the pressure of the suction chamber 132 (or the pressure of the suction chamber 132 and the pressure of the crank chamber 121) The opening degree of the inlet port 511 and the outlet port 512 of the case 510 is adjusted.

On the other hand, the opening / closing core 520 is vertically reciprocated within the case 510 5 and FIGS. 8 and 9, the case 510 is supported by a spring S inserted at the lower end of the case 510, And a bottom dead center at which the compression of the spring S is no longer possible. The opening / closing core 520 is reciprocally moved up and down inside the case 510. It is generally preferable that the opening and closing core 520 is formed to have a size that is in contact with the inner circumferential surface 510a of the case 510 and slidable in the axial direction along the inner circumferential surface 510a for suppressing noise and vibration, The opening / closing core 520 may be formed to be spaced apart from the inner circumferential surface 510a of the case 510 by a predetermined distance.

The spring S is resilient repulsion means for supporting the opening and closing core 520 as described above and is disposed between the bottom of the inner space of the case 510 and the opening and closing core 520 to support the opening and closing core 520 And serves to repel the opening / closing core 520 against the pressure of the refrigerant flowing through the inlet 511. 5, the opening / closing core 520 is pushed up to the uppermost position so as to be brought into close contact with the lid 513, while the suction port 511 is closed by the suction port 511. In other words, when there is no pressure of the refrigerant acting through the suction port 511, When the pressure of the refrigerant acting through the discharge port 512 is the maximum, the discharge port 512 is maximally compressed toward the bottom of the case 510 as shown in FIG.

The bottom of the case 510, that is, the lower end of the inner space in the drawing, except for the communication hole 510b, forms a spring seating surface 510d on which the lower end of the spring S contacts, The surface 510d may be formed with a spring lower end position fixing protrusion 510e for guiding the lower end of the spring S to be seated at the center of the spring seating surface 510d. The spring lower end position fixing protrusion 510e may be formed with an inclined surface 510f for guiding the lower end of the spring S to be smoothly seated on the spring seating surface 510d.

The pressure transmission rod 530 may be provided to the crank chamber 121 so that the pressure of the crank chamber 121 may further act on the opening and closing core 520. The pressure transmitting rod 530 may include a suction port 131, The pressure of the crank chamber 121 can be added to the pressure of the suction chamber 132 so as to cope with the pressure of the suction port 131. Even if the pressure of the suction port 131 becomes excessive, 512) can be adjusted appropriately.

The pressure transmitting rod 530 includes a pressing surface 531 receiving pressure of the crank chamber 121 so that the pressure of the crank chamber 121 can be applied to the inside of the opening / closing core 520 And is formed as a solid rod such as a circular rod that passes through the communication hole 510b of the case 510 and moves up and down integrally with the opening / closing core 520.

The pressure transmitting rod 530 is reciprocated upward and downward inside the case 510 so that the pressure transmitting rod 530 may be formed to be spaced apart from the communication hole 510b of the case 510 by a predetermined distance, It is more preferable that it is formed to have a size which is in close contact with the communication hole 510b of the case 510 and slidable in the axial direction along the communication hole 510b for suppressing vibration.

5, the pressure transmitting bar 530 may be formed separately from the opening / closing core 520. Referring to FIG.

5 and 6, a relative deformation between the opening / closing core 520 and the pressure transmitting rod 530 is relaxed at a joint portion C of the opening / closing core 520 and the pressure transmitting rod 530 It is preferable that a strain relieving portion 540 is formed to allow relative movement in the lateral direction (D) between the pressure transmitting rod 530 and the opening / closing core 520 so that the pressure transmitting rod 530 and the opening /

The coupling portion C of the opening and closing core 520 and the pressure transmission bar 530 includes a coupling protrusion 525 protruding from the inside of the opening and closing core 520 and a coupling protrusion 525 corresponding to the coupling protrusion 525 And an engaging groove 535 formed in the pressure transmitting bar 530 in the shape of a cylinder.

The coupling protrusion 525 includes a cylindrical support piece 525a protruding from the inside of the opening and closing core 520 and an extension of the support piece 525a extending from the support piece 525a, And an engaging piece 525b formed to have an outer diameter larger than the outer diameter of the supporting piece 525a and formed to be inclined toward the pressure transmitting rod 530 so that the outer diameter gradually decreases. The coupling groove 535 includes an upper groove 535a formed in the upper surface of the pressure transmission bar 530 so as to have an inner diameter larger than the outer diameter of the supporting piece 525a, And a lower end groove 535b formed in the shape corresponding to the shape of the coupling piece 525b and formed to have an inner diameter larger than an outer diameter of the coupling piece 525b.

7, a separation preventing jaw is provided between the support piece 525a and the engagement piece 525b to prevent the engagement protrusion 525 from being detached after being coupled to the engagement groove 535 The coupling protrusion 525c is formed between the upper groove 535a and the lower groove 535b and the coupling protrusion 525c is coupled to the coupling protrusion interface 525c. An engaging groove interface 535c serving as a latching jaw against the engaging groove 535c is formed.

Therefore, when the opening / closing core 520 is coupled to the pressure transmitting rod 530, the slanting engagement piece 525b formed on the slanting protrusion 525 can smoothly engage with the pressure transmitting rod 530. After the slanting engagement, The engaging projection interface 525c is engaged with the engaging groove interface 535c so that the opening and closing core 520 and the pressure transmitting rod 530 can not be separated arbitrarily.

7, the strain relieving portion 540 includes a spacing space E formed between the coupling protrusions 525 and the coupling recesses 535. The coupling protrusions 525 and The spacing space E formed between the engaging grooves 535 is defined by a first gap which is a space spaced laterally D between the outer surface 525aa of the supporting piece 525a and the upper groove 535a And a second gap E2 that is a space between the outer surface 525ba of the coupling piece 525b and the lower groove 535b in the lateral direction D, as shown in FIG.

When the first gap E1 and the second gap E2 constitute the spacing space E formed between the engaging protrusions 525 and the engaging recesses 535, The relative movement between the opening and closing core 520 and the pressure transmitting rod 530 can be allowed in the engaging portion C of the opening and closing core 530 and the relative deformation between the opening and closing core 520 and the pressure transmitting rod 530 can be relaxed The smooth movement of the opening / closing core 520 or the pressure transmitting rod 530 can be ensured, so that the performance check of the suction check valve 500 can be prevented or the sticking phenomenon can be prevented.

Hereinafter, the operation of the swash plate compressor according to the embodiment of the present invention will be described with reference to the accompanying drawings.

The swash plate type compressor according to the embodiment of the present invention is configured to vary the opening degree of the suction check valve 500 according to the flow rate of the refrigerant flowing from the external refrigerant line through the suction port 131, 4, the role of the suction check valve 500 becomes more important in the case of the variable displacement swash plate type compressor in which the inclination of the swash plate 300 can be varied.

3, when the inclination of the swash plate 300 is the maximum, the stroke of each piston 400 becomes the maximum, and therefore the amount of the refrigerant flowing from the outside through the suction port 131 becomes maximum do. Accordingly, the opening / closing core 520, which has closed the suction port 511 of the suction check valve 500, reaches the bottom dead center as shown in FIG. 8 while compressing the spring S to the maximum. When the opening / closing core 520 reaches the bottom dead point, the suction port 511 of the suction check valve 500 as well as the discharge port 512 are adjusted to the maximum opening degree so that the refrigerant at the maximum flow rate is delivered to the suction chamber 132 do.

Conversely, when the inclination of the swash plate 300 becomes 90 deg. As shown in Fig. 4, the reciprocation of each piston 400 disappears and the piston bores 111 remain stationary. At this time, the amount of the refrigerant flowing through the suction port 131 is minimized. In this case, as shown in FIG. 5, the opening / closing core 520 closes the suction port 511 by the reaction force of the spring S.

In the variable operation of the swash plate type compressor, the slope of the swash plate 300 varies, so that the refrigerant pressure acting on the opening / closing core 520 through the suction port 511 varies, but the suction port 511 and the suction chamber The opening / closing core 520 can be fully lowered to the position shown in FIG. 8 even when the differential pressure between the open / close core 520 and the open / close core 520 is not the maximum variable. 9, the pressure of the refrigerant from the crank chamber 121 acts on the opening / closing core 520 through the pressure adjusting rod 530, and the spring force of the spring S is applied to the opening / By acting on the core 520, the final regulated opening as shown in FIG. 9 can be reduced, thereby preventing the generation of suction pulsations or noise, which was a conventional problem. In addition, even if relative deformation occurs to some degree between the opening / closing core 252 and the pressure transmitting rod 353 during the above process, the opening / closing core (520) and the pressure transmitting rod (530) 520 and the pressure transmitting rod 530 to allow the relative deformation between the opening and closing core 520 and the pressure transmitting rod 530 to be relaxed, The smooth movement of the pressure transmitting rod 530 can be ensured and the performance check of the suction check valve 500 can be prevented or the sticking phenomenon can be prevented.

According to the swash plate type compressor of the present invention, the pressure transmission rod of the suction check valve is formed separately from the opening and closing core, and relative movement between the opening and closing core and the pressure transmission rod is permitted So that smooth movement of the opening / closing core or the pressure transmitting rod can be ensured, thereby preventing performance deterioration of the suction check valve or fixing phenomenon .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, 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. It is to be understood that the invention may be variously modified and changed.

100: housing 110: cylinder block
120: front head 121: crank chamber
130: rear head 131: suction port
132: suction chamber 135: channel
136: passage 200: rotating shaft
300: swash plate 400: piston
500: Suction check valve 510: Case
511: Inlet port 512: Outlet port
515: communication hole 520: opening / closing core
530: pressure adjusting rod 540: strain relief portion

Claims (7)

A cylinder block 110 having a plurality of cylinder bores 111 formed therein and a front head 120 disposed in front of the cylinder block 110 and formed with a crank chamber 121, And a rear head (130) having a port (131), a suction chamber (132), a discharge port and a discharge chamber (134) formed therein to form an outer body;
A rotating shaft 200 rotatably mounted through one side of the housing 100;
A swash plate 300 mounted on the rotary shaft 200 and integrally rotated with the rotary shaft 200 so as to be able to vary the angle with respect to the rotary shaft 200 so that the refrigerant discharge amount can be adjusted;
And is linearly reciprocated along the inner circumferential surface of the cylinder bore 111 by the rotation of the swash plate 300 so as to be reciprocated relative to the edge of the swash plate 300, A plurality of pistons (400) for compressing the refrigerant and discharging the compressed refrigerant to the discharge chamber (134); And
A suction port 511 is formed on one side of the pipe 135 and a discharge port 512 communicating with the suction port 511 is formed on the other side of the pipe 135. The suction port 131 is connected to the suction port 132, A case 510 through which a communication hole 510b communicating with the passage 136 connecting the crank chamber 121 and the pipeline 135 is passed through is formed on the other side of the case 510, And an opening / closing core (520) which is supported on the inside of the opening / closing member by a spring (S) to regulate the flow of refrigerant from the inlet (511) to the outlet (512) And is pressurized by the pressure of the crank chamber 121 and passes through the communication hole 510b of the case 510 so as to be inserted into the opening / (500) including a pressure-transmitting rod (530) moving upward and downward integrally with the piston (520)
The opening and closing core 520 and the pressure transmitting bar 530 are separately formed and joined to each other. The opening and closing core 520 and the pressure transmitting bar 530 are connected to each other at the coupling portion C of the opening and closing core 520 and the pressure transmitting bar 530, (540) is formed to allow relative movement between the pressure transmission rod (530) and the opening / closing core (520) so that the relative deformation between the pressure transmission rod (530) and the opening / closing core (520) can be relaxed. The method according to claim 1,
The engaging portion C of the opening and closing core 520 and the pressure transmitting bar 530 has an engaging projection 525 protruding from the inside of the opening and closing core 520 and a shape corresponding to the engaging projection 525 And a coupling groove (535) formed in the pressure transmission rod (530). The method of claim 2,
Wherein the strain relieving portion includes a spacing space formed between the engaging protrusion and the engaging recess. The method of claim 3,
The coupling protrusion 525 has a cylindrical supporting piece 525a protruding from the inside of the opening and closing core 520 and a cylindrical supporting piece 525b extending from the supporting piece 525a and extending from the extending portion between the supporting piece 525a And an engaging piece (525b) formed to have an outer diameter larger than an outer diameter of the supporting piece (525a) and formed to be inclined toward the pressure transmitting rod (530) so that the outer diameter gradually decreases. The method of claim 4,
The engaging groove 535 includes an upper groove 535a formed in the upper surface of the pressure transmitting bar 530 so as to have an inner diameter larger than the outer diameter of the supporting piece 525a and an upper groove 535b extending from the upper groove 535a And a lower end groove (535b) formed in a shape corresponding to the shape of the coupling piece (525b) and having an inner diameter larger than an outer diameter of the coupling piece (525b). The method of claim 5,
A coupling protrusion interface 525c is formed between the support piece 525a and the coupling piece 525b and the coupling protrusion 525 serves as a separation preventing jaw coupled to the coupling groove 535, The coupling protrusion 525 is coupled to the coupling groove 535 and the coupling groove interface 535c is formed between the lower groove 535a and the lower groove 535b to serve as a locking protrusion against the coupling protrusion interface 525c Wherein the swash plate type compressor is a swash plate type compressor. The method of claim 6,
The spacing space E formed between the engaging protrusions 525 and the engaging recesses 535 is spaced laterally D between the outer surface 525aa of the supporting piece 525a and the upper groove 535a And a second gap E2 as a space spaced in the lateral direction D between the outer side surface 525ba of the engaging piece 525b and the lower side groove 535b Wherein the swash plate type compressor is a swash plate type compressor.

Images