KR101766508B1 - Swash plate type compressor - Google Patents

Abstract

The present invention relates to a swash plate type compressor, and is characterized in that a suction check valve (500) having a deformation preventing protrusion (531) capable of preventing deformation due to water absorption occurring at an upper end of a case (510) do. Such a swash plate type compressor has a deformation preventing protrusion 531 formed on the lid 530 of the suction check valve 500 to prevent deformation due to moisture absorption at the upper end 511 of the case 510, Thereby preventing separation of the cover 530 and the case 510, which may occur due to moisture absorption, so that the function of the suction check valve 500 can be continuously maintained.

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 when the compressor is stopped, the temperature of the evaporator is raised.

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, when the suction check valve 150 absorbs moisture, the upper end 151a of the case 151 is deformed in the outward direction W of the case 151 so that the lid 169 is separated from the case 151 There is a problem in that the function of the suction check valve 150 may be lost when the cover 169 is separated as described above.

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 suction check valve which can prevent a deformation due to moisture absorption at the upper end of a case, And it is an object of the present invention to provide a swash plate type compressor in which the function of the valve can be continuously maintained.

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, And a suction check valve provided on a pipeline that includes a plurality of pistons to be discharged, a case, an opening / closing core, and a lid and connects the suction port to the suction chamber, And a deformation preventing protrusion for preventing deformation of the wing due to moisture absorption occurring at the upper end portion is formed.

The cover and the upper end of the case are coupled to each other through an uneven structure on the inside of the case, and the deformation preventing protrusion is located outside the case to prevent the upper end of the case from being deformed toward the outside of the case desirable.

Wherein the cover includes a body portion positioned on an upper surface of the case and an engaging portion extending downward from the body portion and coupled to the inside of the case, It is preferable that they are protruded.

The deformation preventing protrusion may protrude from a lower surface of the body portion to a predetermined length.

The deformation preventing protrusion may be formed between the deformation preventing protrusion and the outer surface of the upper end of the case to allow the upper end portion of the case to be finely deformed toward the outer side of the case when the case and the lid are coupled.

The predetermined length of the deformation preventing projection projecting from the lower surface of the body is preferably 0.1 mm to 5 mm.

A concave and a convex structure formed at a joint portion between the cover and the upper end of the case includes an engaging projection formed on an inner surface of an upper end of the case, an engaging groove formed in an engaging portion of the lid and engaging with the engaging projection, And a guide protrusion formed continuously on one side and having a coupling-inducing curved surface formed on one side thereof.

According to the swash plate type compressor as described above, by forming the deformation preventing protrusion on the cover of the suction check valve, it is possible to prevent deformation due to moisture absorption at the upper end portion of the case, It can be maintained continuously.

1 is a partially cutaway perspective view showing a suction check valve employed in a conventional swash plate type compressor.
FIG. 2 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; FIG.
3 is a longitudinal sectional view of a swash plate type compressor according to the present invention, showing a swash plate erected in a radial direction of a rotating shaft;
4 is a longitudinal sectional view of a suction check valve applied to a swash plate type compressor according to the present invention.
5 is an enlarged view of an "I" area in Fig. 4; 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.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a swash plate type compressor in which a swash plate is inclined with respect to a rotation axis, FIG. 4 is a longitudinal sectional view of a suction check valve applied to the swash plate type compressor according to the present invention, and FIG. 5 is an enlarged view of an area "I" of FIG.

2 to 5, 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, a suction check valve 500).

The housing 100 is composed of a cylinder block 110, a front head 120 and a rear head 130 as shown in FIGS. 2 and 3, which is an outer body of the swash plate type compressor. 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. 2 and 3, 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.

As shown in FIGS. 2 and 3, 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 the center 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.

2, 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 rotary 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.

2 and 3 are variable displacement swash plate type compressors. The swash plate type compressor is installed such that the inclination angle of the swash plate 300 varies, and the swash plate 300 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. 2, 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 means of the swash plate 300. As shown in FIGS. 2 and 3, 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 / closing core 520, and a cover 530, as shown in FIG. The suction check valve 500 is controlled by the differential pressure between the suction port 131 of the rear head 130 and the suction chamber 132 so that the suction amount of the refrigerant is appropriately changed to avoid sudden suction It does.

The case 510 is a part constituting the external body of the suction check valve 500 and is installed on the pipeline 135 connecting the suction port 131 to the suction chamber 132.

The case 510 is formed of a hollow cylinder such as a cylindrical body and has a suction port 510a formed at one side thereof and a discharge port 510b communicating with the suction port 510a formed at the other side thereof.

 The opening and closing core 520 is a means for interrupting the flow of the refrigerant passing through the inside of the case 510. The opening and closing core 520 includes a case 510 for controlling the flow of the refrigerant from the inlet 510a to the outlet 510b, 510 of the case 510 in accordance with the pressure difference between the pressure of the refrigerant flowing through the suction port 510a of the case 510 (also the pressure of the suction port 131) and the pressure of the suction chamber 132 510a and the discharge port 510b.

In addition, the opening / closing core 520 is reciprocally moved up and down inside the case 510 And is supported by a spring S inserted at the lower end of the case 510 as shown in FIG. 4, and is supported by the upper end 511 of the case 510 And travels back and forth between the top dead center constrained by the lid 530 and the bottom dead center where the compression of the spring S is no longer possible. The opening / closing core 520 may be formed to be spaced apart from the inner circumferential surface of the case 510 by a predetermined distance because the opening / closing core 520 reciprocates vertically inside the case 510. However, It is more preferable that the protrusion 510 is formed to have a size that is in close contact with the inner circumferential surface of the protrusion 510 and can slide in the axial direction along the inner circumferential surface.

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 port 510a. 4, the opening / closing core 520 is pushed up to the uppermost position so as to be brought into close contact with the lid 5, whereas the suction port 511, The pressure of the refrigerant flowing through the discharge port 512 is maximized toward the bottom of the case 510 so that the discharge port 512 can be maximally opened.

4, the lid 530 is installed on the upper end 511 of the case 510, and the lid 530 is provided on the upper portion 511 of the case 510 so that the upward movement of the opening / Limit the upward travel distance. The cover 530 is provided with a deformation preventing protrusion 531 for preventing deformation due to moisture absorption at the upper end 511 of the case 510.

4 and 5, when the cover 530 is installed on the upper end 511 of the case 510, the cover 510 is inserted into the case 510 through the concavo- (Not shown). The deformation preventing protrusion 531 is located on the outer side of the case 510 to prevent the upper end 511 of the case 510 from being deformed in the outer direction A of the case 510.

5, the lid 530 includes a body portion 530a positioned on the upper end surface 511a of the case 510 and a lower portion 530a extending downward from the body portion 530a, And the engaging portion 530b coupled to the inside of the case 510. The deformation preventing protrusion 531 extends downward from the lower surface 530aa of the body portion 530a to a position Respectively. It is preferable that the predetermined length D of the deformation preventing projection 531 protruding from the lower surface 530aa of the body portion 530a is 0.1 mm to 5 mm. If the protrusion length is less than 0.1 mm, the case 510 It is not possible to sufficiently prevent the deformation of the upper end 511 of the cover 530. If it is larger than 5 mm, the coupling between the cover 530 and the case 510 is deteriorated,

5, the concavo-convex structure Z formed at the coupling portion between the lid 530 and the upper end 511 of the case 510 may be formed on the inner side of the upper end 511 of the case 510 A coupling protrusion P formed on the coupling protrusion 511c and a coupling groove C formed on the coupling portion 530b of the cover 530 to engage with the coupling protrusion P, And guide projections G formed on one side thereof and having a curved surface U for guiding coupling.

The curved surface U for guiding the coupling may be formed by the guide protrusion G when the lid 530 is coupled to the upper end 511 of the case 510, So that smooth coupling between the lid 530 and the upper end 511 of the case 510 can be achieved due to the curved surface U for coupling.

It is preferable that a deformation inducing space E is formed between the deformation preventing protrusion 531 and the outer surface 511b of the upper end 511 of the case 510. When the lid 530 is coupled to the upper end 511 of the case 510, the coupling inducing curved surface U formed on the guide protrusion G is guided to the case 510 The upper end 511 of the case 510 is allowed to be finely deformed in the outer direction A of the case 510 in a process of contacting the coupling protrusion P formed in the case 510, This can be done.

According to the swash plate type compressor according to the above-described embodiment of the present invention, by forming the deformation preventing protrusion on the cover of the suction check valve, it is possible to prevent deformation due to moisture absorption at the upper end portion of the case, The function of the check valve can be continuously maintained.

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: Upper part of case 511a: Upper side of case
511b: upper end outer surface of the case 511c: upper end outer surface of the case
520: opening / closing core 530: cover
530a: Body part 530b:
Z: concavo-convex structure P: engaging projection
C: engaging groove G: guide projection

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 check valve 500 installed on a pipeline 135 including a case 510, an opening and closing core 520 and a lid 530 and connecting the suction port 131 to the suction chamber 132, / RTI >
The lid 530 includes a body portion 530a positioned on an upper end surface 511a of the case 510 and a lower portion 530a extending downward from the body portion 530a and coupled to the inside of the case 510 A deformation preventing protrusion 531 is formed which includes a coupling portion 530b and prevents deformation of the wing due to moisture absorption occurring in the upper end 511 of the case 510,
The deformation preventing protrusion 531 is located on the outer side of the case 510 to prevent the upper end 511 of the case 510 from being deformed in the outer direction A of the case 510, 530a in a downward direction from an upper end 511 of the case 510,
An engagement protrusion P formed on the inner surface 511c of the upper end 511 of the case 510 at a position where the cover 530 is coupled to the upper end 511 of the case 510, A coupling groove C formed in the coupling portion 530b of the coupling groove 530 and coupled to the coupling projection P and a curved surface U continuously formed on the lower side of the coupling groove C, And a concavo-convex structure (Z) including a formed guide projection (G) is formed.
delete delete delete The method according to claim 1,
The upper end 511 of the case 510 is engaged with the case 510 when the lid 530 and the case 510 are coupled to each other between the deformation preventing protrusion 531 and the outer surface 511b of the upper end 511 of the case 510, 510) is formed in the outer circumferential direction (A) of the swash plate type compressor (100).
The method according to claim 1,
Wherein a predetermined length D of the deformation preventing protrusion 531 protruding from the lower surface 530aa of the body portion 530a is 0.1 mm to 5 mm.
delete

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