KR102032397B1 - A swash plate type compressor - Google Patents

Abstract

The present invention provides a cylinder block having a plurality of cylinder bores therein, a drive shaft rotatably installed in the cylinder block and being rotated by receiving a driving force, the swash plate and the swash plate being inclined to the drive shaft and installed in the cylinder block. A plurality of pistons that linearly reciprocate in the cylinder bore as they rotate and compress the refrigerant, an inlet formed in the cylinder block so that the refrigerant is sucked into the cylinder block from the outside, and a flow direction of the refrigerant formed in the inlet and passing through the inlet is switched. It relates to a swash plate compressor including a switching unit to be.

Description

Swash Plate Compressor {A SWASH PLATE TYPE COMPRESSOR}

The present invention relates to a swash plate compressor for switching the suction path during suction of the refrigerant so that oil on the outer peripheral surface of the piston is not removed.

The compressor used in the automotive air conditioning system sucks the gaseous refrigerant evaporated from the evaporator, compresses the refrigerant to a high temperature and high pressure state that is easy to liquefy, and delivers the refrigerant to the condenser.

In such a compressor, there are a reciprocating type that actually compresses the refrigerant and a reciprocating type that performs compression while reciprocating, and a rotary type that performs compression while rotating. The reciprocating type includes a crank type for transmitting the driving force of the driving source to a plurality of pistons using a crank, a swash plate type for transmitting a swash plate to a drive shaft provided with a wobble plate, and a wobble plate type using a wobble plate. Rotary type includes vane rotary type using rotary rotary shaft and vane, and scroll type using rotary scroll and fixed scroll.

1 is a cross-sectional view showing the configuration of a general swash plate type compressor, and FIG. 2 is a longitudinal sectional view of a cylinder block of a general swash plate type compressor. As shown in these figures, the swash plate compressor 1 according to the present invention includes front and rear cylinder blocks 4 and 4 'having a plurality of cylinder bores 4a formed therein, and the front and rear cylinder blocks 4 and 4, respectively. And a front head 2 and a rear head 27 which are respectively coupled to the front and rear of 4 'to form discharge chambers 2a and 27a and suction chambers 2b and 27b. The front head 2, the front and rear cylinder blocks (4, 4 ') and the rear head 27 are combined by a plurality of bolts (B) to form an overall compressor.

The front head 2 has a substantially cylindrical shape, and the discharge chamber 2a and the suction chamber 2b are formed therein. The discharge chamber 2a and the suction chamber 2b may be selectively communicated with the cylinder bore 4a of the front cylinder block 4, respectively. That is, through the valve assembly 14 provided between the front head 2 and the front cylinder block 4, the discharge chamber 2a and the suction chamber 2b are each cylinder bore based on the pressure difference of the refrigerant. It is formed to be able to communicate with (4a).

2, a plurality of cylinder bores 4a are formed in the front cylinder block 4 and the rear cylinder block 4 'in a direction parallel to the drive shaft 24. The cylinder bores 4a have a cylindrical shape and a plurality of cylinder bores are arranged in a circle. The cylinder bore 4a is a space in which the refrigerant is compressed by the piston 30 linearly reciprocating therein.

The muffler portion 5 is formed outside the front and rear cylinder blocks 4 and 4 '. In the center of the front and rear cylinder blocks 4 and 4 ′, a shaft hole 6 is formed to rotatably support the driving shaft 24. In addition, a plurality of communication holes 8 are formed at a portion corresponding to the cylinder bore 4a and the shaft hole 6. The communication hole 8 is formed in the front and rear cylinder blocks (4, 4 ') to reduce the overall weight of the product, it may be formed in the portion except the cylinder bore (4a) and the shaft hole (6).

The suction muffler chamber 10 is formed inside the muffler portion 5 between the front and rear cylinder blocks 4 and 4 '. The suction muffler chamber 10 is a portion through which the refrigerant sucked into the front and rear cylinder blocks 4 and 4 'passes. The suction muffler chamber 10 serves to reduce pulsation and noise of the refrigerant sucked into the cylinder bore 4a. Communication holes 11 communicating with the suction muffler chamber 10 and the suction chambers 2b and 27b are formed. The refrigerant passing through the suction muffler chamber 10 is introduced into the suction chambers 2b and 27b through the communication hole 11.

Between the front head 2 and the front cylinder block 4, there is provided a valve assembly 14 for controlling the flow of refrigerant between the suction chamber 2b and the discharge chamber 2a and the cylinder bore 4a. . That is, the valve assembly 14 controls the refrigerant flow from the suction chamber 2b to the cylinder bore 4a and the refrigerant flow from the cylinder bore 4a to the discharge chamber 2a, respectively.

A swash plate chamber 23 is formed inside the front cylinder block 4 and the rear cylinder block 4 '. The swash plate chamber 23 is a space in which the swash plate 25 installed on the drive shaft 24 is rotatable.

A drive shaft 24 for rotating the swash plate 25 is installed through the center of the front head 2, the front cylinder block 4, and the rear cylinder block 4 '. An approximately disc shaped swash plate 25 is inclined at a predetermined angle to the drive shaft 24 on the drive shaft 24.

A shoe 26 is provided between the swash plate 25 and the piston 30. The shoe 26 is provided between the swash plate 25 and the piston 30 so that the rotational movement of the swash plate 25 is transmitted to the piston 30 so that the piston 30 is linearly reciprocated.

As such, the piston 30 linearly reciprocating through the shoe 26 has a substantially cylindrical shape corresponding to the inside of the cylinder bore 4a, and both ends of the front cylinder block 4 and the rear cylinder block 4 ', respectively. It is installed in the cylinder bore 4a of the) to compress the refrigerant supplied into the cylinder (4a).

The rear head 27 is mounted on one surface of the rear cylinder block 4 '. The rear head 27 is provided with a discharge chamber 27a and a suction chamber 27b. The discharge chamber 27a and the suction chamber 27b communicate with each other with the cylinder bore 4a formed in the rear cylinder block 4 ', respectively. In addition, the valve assembly 14 is installed between the rear cylinder block 4 'and the rear head 27, as described above.

The operation of the compressor having such a configuration will be described. As the drive shaft 24 is rotated by a driving force transmitted from the outside, the swash plate 25 is rotated together with the drive shaft 24. Rotation of the swash plate 25 allows the piston 30 to make a linear reciprocating motion inside the cylinder bore 4a.

At this time, as the drive shaft 24 rotates, the refrigerant in the suction chambers 2b and 27b is sucked into the cylinder bore 4a, respectively. As the refrigerant passes through the suction muffler chamber 10 before entering the suction chambers 2b and 27b, pulsation and noise are reduced. For reference, the refrigerant is sucked into the cylinder bore 4a when the piston 30 moves from the bottom dead center to the top dead center in the corresponding cylinder bore 4a while the pressure inside the cylinder bore 4a is low. to be. As such, when the refrigerant is sucked into the cylinder bore 4a, the piston 30 moves in the direction of compressing the sucked refrigerant in the corresponding cylinder bore 4a.

When the refrigerant is compressed in the cylinder bore 4a, the pressure inside the cylinder bore 4a becomes relatively high and the refrigerant is discharged to the discharge chambers 2a and 27a. The refrigerant discharged into the discharge chambers 2a and 27a is transferred to the condenser (not shown) through the refrigerant discharge port.

However, the conventional compressor as described above has the following problems.

The piston 30 reciprocating inside the compressor, specifically in the front and rear cylinder blocks 4 and 4 ', has an oil film formed on its outer circumferential surface so that wear, noise, and vibration do not occur during movement.

Among the plurality of pistons 30 in which an oil film is formed, particularly in the case of the piston 30 disposed adjacent to the communication hole 11, the refrigerant 30 is in contact with the outer circumferential surface of the piston 30 in the process of being sucked through the communication hole 11. Inhaled. In this process, the refrigerant removes the oil film on the outer circumferential surface of the piston 30. As a result, the piston 30 is stuck in the reciprocating process, and as a result, the piston 30 is easily worn or noise and vibration are generated in the compressor.

The present invention is to solve the above-mentioned problems of the prior art, an aspect of the present invention is to provide a swash plate compressor to prevent the oil film formed on the outer peripheral surface of the piston during the suction process of the refrigerant.

The swash plate compressor according to the embodiment of the present invention includes a cylinder block having a plurality of cylinder bores formed therein, a drive shaft rotatably installed in the cylinder block and being rotated by a driving force, and installed inclined to the drive shaft. A swash plate rotated in a swash plate chamber formed therein, a plurality of pistons linearly reciprocating in the cylinder bore according to the rotation of the swash plate and compressing the refrigerant, and a suction port formed in the cylinder block so that the refrigerant is sucked into the cylinder block from the outside. And, and may be formed in the inlet and the switching unit for changing the flow direction of the refrigerant passing through the inlet.

In the swash plate compressor according to the embodiment of the present invention, the switching unit may allow the refrigerant sucked through the suction port to be in contact with one surface of the switching unit so that the flow direction is changed.

In the swash plate compressor according to an embodiment of the present invention, the switching unit may be formed at the inner end of the cylinder block of the suction port.

In the swash plate compressor according to an embodiment of the present invention, the switching unit may be integrally formed with the cylinder block.

In the swash plate type compressor according to an embodiment of the present invention, the switching unit may allow the flow direction of the refrigerant to be switched to a direction inclined with respect to the flow direction before contacting one surface of the switching unit.

In the swash plate type compressor according to the embodiment of the present invention, the switching unit flow direction of the refrigerant so that the refrigerant sucked through the suction port does not contact radially with respect to the outer circumferential surface of the piston closest to the suction port among the plurality of pistons. Can be switched.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

According to the present invention, by changing the flow direction of the refrigerant passing through the inlet of the cylinder block it is possible to prevent the oil film formed on the outer circumferential surface of the piston adjacent to the inlet to be removed, thereby preventing the sticking of the piston that occurred in the conventional swash plate type compressor It does not occur.

1 is a longitudinal sectional view showing a conventional swash plate type compressor.
Figure 2 is a cross-sectional view showing a conventional swash plate compressor.
Figure 3 is a perspective view showing a cylinder block of the swash plate compressor according to an embodiment of the present invention.
4 is a cross-sectional view of the main portion of the cylinder block shown in FIG.

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

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

In addition, the following examples are not intended to limit the scope of the present invention but merely illustrative of the components set forth in the claims of the present invention, which are included in the technical spirit throughout the specification of the present invention and constitute the claims Embodiments that include a substitutable component as an equivalent in the element may be included in the scope of the present invention.

Figure 3 is a perspective view showing a cylinder block of the swash plate compressor according to an embodiment of the present invention, Figure 4 is a cross-sectional view of the main portion of the cylinder block shown in FIG.

First, since the swash plate compressor according to the embodiment of the present invention has a configuration of the cylinder block, the configuration may be the same as the conventional swash plate compressor referenced in FIG. 1 except for the cylinder block. Therefore, in the swash plate compressor according to the present embodiment, the same configuration as that of the conventional swash plate compressor will be described with reference to FIG. 1, and the matters improved from the conventional swash plate compressor shown in this embodiment are illustrated in FIG. This will be described with reference to 3 and FIG. 4. However, the swash plate type compressor shown in FIG. 1 is a double head type swash plate type compressor but has a structure in which a suction chamber is separately provided at the front head and the rear head, but the present invention is not limited thereto. In the swash plate type compressor or the swash plate type compressor of the rotary valve type which allows the refrigerant to be sucked through the suction passage inside the drive shaft, the features of the swash plate type compressor according to the present embodiment to be described with reference to FIGS. 3 and 4 are applied. Of course it can.

The swash plate compressor according to the embodiment of the present invention may include a cylinder block (4, 4 '), a drive shaft 24, a swash plate 25, and a piston (30).

The cylinder blocks 4 and 4 'may be composed of front and rear cylinder blocks 4 and 4' as shown. The front head 2 and the rear head 27 forming the discharge chambers 2a and 27a and the suction chambers 2b and 27b may be coupled to the front and rear of the front and rear cylinder blocks 4 and 4 ', respectively. have. The front head 2, the front and rear cylinder blocks 4, 4 'and the rear head 27 may be coupled by a plurality of bolts (B). However, in the illustrated example, an example consisting of front and rear cylinder blocks 4 and 4 'to which the cylinder blocks 4 and 4' are coupled to each other is illustrated, but is not limited thereto. The front and rear cylinder blocks 4, 4 'may be integrally formed.

The front and rear cylinder blocks 4 and 4 'may have a swash plate chamber 23 formed therein. In addition, a plurality of cylinder bores 4a may be formed in the front and rear cylinder blocks 2 and 2 ', respectively. The cylinder bores 4a may be arranged spaced apart in the circumferential direction as shown in FIG. 3, and may have a cylindrical shape. The piston 30 is installed in the cylinder bore 4a to enable the linear reciprocating motion.

In the center of the front, rear cylinder block (4, 4 ') can be formed a shaft hole (6) for the drive shaft 24 is installed. The shaft hole 6 is formed by penetrating the front and rear cylinder blocks 4, 4 'in front and rear.

In the drive shaft 24 provided in the shaft hole 6, the swash plate 25 is installed to rotate together with the drive shaft 24. The swash plate 25 rotates in the swash plate chamber 23 formed in the cylinder blocks 4 and 4 ', and the piston 30 linearly reciprocates as the swash plate 25 rotates. Since the interconnection structure of the swash plate 25 and the piston 30 is a general structure already disclosed in the swash plate compressor structure, detailed description thereof will be omitted.

A plurality of communication holes 8 may be formed in a portion corresponding to the cylinder bore 4a and the shaft hole 6. The communication hole 8 may be formed in the front and rear cylinder blocks 4 and 4 'to reduce the overall weight of the product, and may be formed in portions except the cylinder bore 4a and the shaft hole 6. have.

On the other hand, the cylinder block (4, 4 ') may be formed with a suction port 41 to allow the refrigerant to be sucked into the cylinder block (4, 4') from the outside of the cylinder block (4, 4 '). In the example shown in FIGS. 3 and 4, as an example, an example in which a suction port 41 is formed in the rear cylinder block 4 ′ is shown.

The refrigerant sucked through the suction port 41 may flow into the cylinder block 4 ′ and then flow into the suction chambers 2b and 27b. At this time, the refrigerant is formed on the outer circumferential surface of the piston 30 closest to the suction port 41 immediately after passing through the suction port 41 (the piston located in the cylinder bore indicated by reference numeral 4a1 nearest to the suction port among the cylinder bores shown in FIG. 3). It may flow while contacting at a predetermined pressure, in which case there is a concern that the oil film formed on the outer circumferential surface of the piston 30 may be removed by the refrigerant as described in the problem of the conventional swash plate type compressor. Therefore, the swash plate compressor according to the present embodiment may include a switching unit 51 so that such a problem does not occur.

The switching unit 51 performs a function of switching the flow direction of the refrigerant passing through the suction port 41 in the process of passing through the suction port 41. In this case, the switching unit 51 may allow the flow direction of the refrigerant to be switched while contacting one surface of the switching unit 51. In addition, while the flow direction of the refrigerant is in contact with one surface of the switching unit 51, the refrigerant may be switched in a direction inclined with respect to the flow direction before contact. Therefore, even if the longitudinal direction of the inlet port 41 is directed toward the outer circumferential surface side of the piston 30 closest to the inlet port 41, the flow direction of the refrigerant is switched by the above-described function of the switching unit 51 so that the piston 30 The removal of the oil film on the outer circumferential surface can be greatly reduced.

As a specific example of the structure of the switching unit 51, the illustrated example shows an example in which the switching unit 51 is formed at the end located inside the cylinder block 4 'of both ends of the suction port 41. As shown in FIG. This is to minimize the amount of refrigerant directed toward the piston 30 by forming the switching part 51 at the position closest to the piston 30 in the longitudinal direction of the suction port 41. Switching portion 51 may be formed to protrude inclined toward the inside of the cylinder block (4 ') from the end edge of the suction port 41, wherein the switching portion 51 is integral with the cylinder block (4') in consideration of manufacturing convenience Can be formed. One surface of the switching unit 51, in the example shown in FIG. 4, the upper surface 51a of the switching unit may be formed in various shapes such that the flow direction of the refrigerant may be changed, including the illustrated shape.

The refrigerant passing through the suction port 41 is deflected in the radial direction of the piston 30 with respect to the outer circumferential surface of the piston 30 closest to the suction port 41 by switching the flow direction by the above-described switching unit 51. Will be directed. In general, the flow direction may be switched in a direction close to the curvature direction of the outer circumferential surface of the piston 30, and therefore, even if the piston 30 is in contact with the piston 30 after passing through the inlet 41, The pressure is greatly reduced, thereby not damaging the oil film on the outer circumferential surface of the piston 30.

Although the present invention has been described in detail through specific examples, it is intended to specifically describe the present invention, and the present invention is not limited thereto, and the present invention has ordinary knowledge in the art within the technical spirit of the present invention. It is obvious that the modification or improvement is possible by the ruler.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

4,4 ': cylinder block
4a: Cylinder Bore
24: drive shaft
25: swash plate
30: piston
41: suction port
51: switching unit

Claims (6)

Cylinder blocks 4 and 4 'having a plurality of cylinder bores 4a formed therein;
A drive shaft (24) rotatably installed in the cylinder block (4,4 ') and being rotated by receiving a driving force;
A swash plate 25 that is inclined to the drive shaft 24 and rotates in the swash plate chamber 23 formed in the cylinder blocks 4 and 4 ';
A plurality of pistons 30 compressing the refrigerant while linearly reciprocating in the cylinder bore 4a according to the rotation of the swash plate 25;
A suction port 41 formed in the cylinder blocks 4 and 4 'such that refrigerant is sucked into the cylinder blocks 4 and 4' from the outside; And
It includes a switching unit 51 extending from the inner end of the cylinder block (4, 4 ') of the suction port 41 and protrudes inclined toward the inside of the cylinder block (4, 4'),
The switching unit 51 is such that the refrigerant sucked through the suction port 41 does not contact radially with respect to the outer circumferential surface of the piston closest to the suction port 41 among the plurality of pistons 30. A swash plate compressor, characterized in that the flow direction is switched. The method according to claim 1,
The switching unit 51 is a swash plate compressor characterized in that the flow direction is switched while the refrigerant sucked through the suction port 41 is in contact with the one surface (51a) of the switching unit.
delete The method according to claim 1,
The switching unit 51 is a swash plate compressor, characterized in that formed integrally with the cylinder block (4, 4 ').
The method according to claim 2,
The switching unit 51 is a swash plate-type compressor characterized in that the flow direction of the refrigerant is switched in the direction inclined with respect to the flow direction before contacting the one surface (51a) of the switching unit.
delete

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