KR20200013443A - Electric swash plate compressor - Google Patents

Abstract

Disclosed is a variable swash plate type compressor which can stably control the amount of oil circulated in the variable swash plate type compressor by using a flow path adjustment means having a size variable in a radial direction in accordance with a change in the temperature of a refrigerant. The variable swash plate type compressor comprises a front housing (10), a rear housing (20), a cylinder block (30), a swash plate (40), a plurality of pistons (50), a gasket (60), an oil passage (34), and a flow path adjustment means (500).

Description

Variable swash plate compressor {Electric swash plate compressor}

The present invention relates to a swash plate compressor, and more particularly, to a variable swash plate compressor having a flow path adjusting means used to adjust the amount of movement of oil circulating in the variable swash plate compressor.

An automotive cooling system includes a compressor for adiabatic compression of low-temperature low-pressure gaseous refrigerant to be a high-temperature high-pressure gaseous refrigerant, and a condenser for making a high-temperature, high-pressure gas refrigerant discharged from the compressor into a saturated liquid state by heat exchange; An expansion valve for throttling the refrigerant liquefied from the condenser to make a low-pressure wet steam state, and an evaporator for evaporating the refrigerant conveyed from the expansion valve by heat exchange to make a vapor to the compressor.

Here, the compressor selectively receives the power of the engine delivered through the pulley of the vehicle by the intermittent action of the electronic clutch, sucks the refrigerant exchanged from the evaporator, compresses it by the linear reciprocating motion of the piston, and discharges it to the condenser. By the operation of the compressor, the refrigerant is circulated in the cooling cycle.

The compressor is known in various forms according to the compression method and structure, and swash plate compressor is generally used in the automotive cooling system. In the swash plate compressor, when the power of the engine is transmitted to the drive shaft, the pistons move forward and backward by the swash plate rotating together with the drive shaft to perform suction, compression, and discharge of the refrigerant through the valve unit.

On the other hand, in the automotive cooling system employing the compressor as described above, by lubricating the mechanical friction surface of the compressor drive part by circulating by containing a refrigerant for lubrication purpose for smooth operation of the compressor in the refrigerant.

At this time, when the oil contained in the refrigerant flows into a heat exchanger such as a condenser, an expansion device, a pipe and a lake, the oil is coated on the inner wall of the oil flow path such as a heat exchanger, or the oil occupies a space of the refrigerant flow path of the heat exchanger. The fluidity of the coolant is lowered, thereby lowering the heat exchange efficiency of the heat exchanger.

In addition, when the oil circulates through the entire cooling system, a significant fluctuation occurs in the amount of oil supplied to the compressor, and thus the durability of the compressor is lowered because lubrication of the compressor is not made smoothly and smoothly.

Therefore, it is necessary to prevent oil from being supplied to other components except the compressor.

The oil separator separates the lubrication oil contained in the refrigerant gas discharged from the compressor and recycles the lubrication oil to the compressor, thereby preventing the deterioration of heat exchange efficiency due to the lubrication oil and lubricating the compressor.

The oil separator is classified into an external type and a built-in compressor type. The external oil separator has a structure in which the inlet port is connected to the discharge line of the compressor, the outlet port is connected to the inlet end of the condenser, and the oil storage chamber and the compressor suction line of the inside are connected through a capillary tube (capillary tube). .

The refrigerant containing the lubricating oil discharged from the compressor is introduced into the oil separator through the inlet port of the oil separator, where the refrigerant and the lubricating oil are separated from each other.

The refrigerant is supplied to the condenser through the outlet port of the oil separator, and the lubricating oil is stored in the oil reservoir of the oil separator, and then supplied to the compressor suction line through the capillary tube and flows into the compressor together with the refrigerant discharged from the evaporator. do. Therefore, the lubricating oil can be prevented from flowing out to the heat exchanger such as the condenser or the evaporator while being mixed with the refrigerant.

However, the external oil separator as described above has the advantage that it is relatively easy to manufacture and design, and the oil separation efficiency is good. However, the external oil separator is installed separately from the compressor and requires a separate bypass circuit. have.

Proposed in consideration of the problems of the external oil separator as described above is a compressor built-in oil separator is configured integrally with the compressor.

The built-in oil separator separates only the oil from the refrigerant and the oil mixture to help lubricate the inside of the compressor. The oil separator is a case where the oil is not circulated under the operating conditions of the high load ALPM is trapped in the crank chamber, which causes a problem that the temperature of the compressor is rapidly increased.

In the conventional oil separator, since the oil channel is formed in a thin gasket, the cross-sectional area of the oil channel is small, which causes a problem that the oil channel is blocked by impurities or the like.

Therefore, it is necessary to supplement the disadvantages of the conventional oil separator and to take measures for stable oil circulation.

Japanese Patent Laid-Open No. 11-93880

The present invention has been made to solve the above problems, the variable swash plate compressor according to an embodiment of the present invention includes a front housing 10 is formed with a crank seal 12 inside; A rear housing 20 having a discharge chamber 22 through which refrigerant is discharged; a cylinder block 30 coupled between the front housing 10 and the rear housing 20 and having a plurality of cylinder bores 32. ; A swash plate 40 installed in the swash plate chamber 2 in the cylinder block 30 and integrally rotating with the drive shaft 3; A plurality of pistons 50 reciprocating in the cylinder bore 2 by the inclination of the swash plate 40; A gasket (60) provided between the cylinder block (30) and the rear housing (20) and having an oil hole (62) through which oil contained in the refrigerant moves; An oil passage (34) provided in the cylinder block (30) and communicating with the crank seal (12) and the oil hole (62); And an oil passage adjusting means 500 disposed between the oil passage 34 and the oil hole 62, wherein the oil passage adjusting means 200 has the oil hole 62 in response to a temperature change of the refrigerant. The radiator communicates with each other so that the amount of oil contained in the refrigerant moving to the oil hole 62 is adjusted.

The cylinder block 30 is formed with an extension 36 extending toward the gasket 60 at an end of the oil passage 34 facing the oil hole 62 of the gasket 60. The passage adjusting means 200 is provided at 36.

The flow path adjusting means 200 has a scroll shape wound a plurality of times in the radial direction of the expansion part 36 concentrically with the center of the oil hole 62.

The flow path adjusting means 200 includes: a first variable part 210 wound and extending radially outward from the center of the oil hole 62; A second variable part 220 extending radially outward from an extended end of the first variable part 210; The third variable part 230 includes a third variable part 230 extending radially outwardly from an extended end of the second variable part 220.

The first variable portion 210 is thermally expanded at a first temperature T1, the second variable portion 220 is thermally expanded at a second temperature T2, and the third variable portion 230 is formed. The thermal expansion according to the temperature change is minimal, but the first temperature T1 of the first variable portion 210 is thermally expanded at a temperature lower than the second temperature T2 of the second variable portion 220. It is characterized by.

Since the first variable part 210 is wound more than the second variable part 220, the change in radius due to thermal expansion is increased.

Bimetal is used for the first and second variable parts 210 and 220.

The flow path adjusting means 200 is made of bimetal.

The flow path adjusting means 200 has a band shape.

The expansion part 36 is provided with a catching part 38 for preventing the separation of the flow path adjusting means 200.

The present embodiment for achieving the above object is to provide a variable swash plate type compressor that can stably move the oil to the oil hole by the radius is changed in accordance with the temperature change of the refrigerant using the flow path adjusting means.

The variable swash plate compressor according to the present invention can adjust the moving amount of oil by using the characteristics of the bimetal which is thermally expanded according to the temperature change of the refrigerant, so that the durability is improved even when the variable swash plate compressor is operated under high load conditions, Performance also remains stable.

Embodiments of the present invention can easily adjust the amount of oil to be moved to the oil hole according to the temperature change of the refrigerant can perform a stable lubrication for components that require lubrication.

Embodiments of the present invention can improve the problem that the components that need lubrication in the variable swash plate compressor is fixed to each other to reduce the possibility of abnormal heat generation, improve durability, and minimize the problem of noise generation.

1 is a view showing a variable swash plate compressor and a flow path adjusting means according to an embodiment of the present invention.
2 to 3 is an operating state diagram of the flow path adjusting means according to an embodiment of the present invention.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. The thickness of the lines or the size of the components shown in the accompanying 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 depending on the intention or precedent of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

Hereinafter, a variable swash plate compressor according to an embodiment of the present invention will be described with reference to the drawings. For reference, Figure 1 is a view showing a variable swash plate compressor and a flow path control means according to an embodiment of the present invention, Figures 2 to 3 is an operating state diagram of the flow path control means in an embodiment of the present invention.

1 to 2, the variable swash plate type compressor according to an embodiment of the present invention includes a front housing 10 having a crank chamber 12 formed therein, and a discharge chamber 22 through which refrigerant is discharged. A cylinder block 30 formed between the formed rear housing 20, the front housing 10 and the rear housing 20, and having a plurality of cylinder bores 32, and within the cylinder block 30. A swash plate 40 which is installed in the swash plate chamber 2 and rotates integrally with the drive shaft 3, and a plurality of pistons 50 which reciprocate in the cylinder bore 2 due to the inclination of the swash plate 40. And an oil passage 34 provided in the cylinder block 30 to communicate the crank seal 12 and the oil hole 62; And an oil passage adjusting means 500 disposed between the oil passage 34 and the oil hole 62.

In addition, the flow path adjusting means 200 may have an amount of oil included in the refrigerant moving to the oil hole 62 by varying a radius of communication with the oil hole 62 in response to the temperature change of the refrigerant. Adjust

The cylinder block 30 is formed with an extension 36 extending in diameter toward the gasket 60 at the end of the oil passage 34 facing the oil hole 62 of the gasket 60. The flow path adjusting means 200 is installed in the expansion part 36.

The gasket 60 may have the oil hole 62 opening smaller than the diameter of the oil passage 34 or may be opened in the same manner.

The gasket 60 is disposed between the cylinder block 30 and the rear housing 20 and corresponds to a component constituting a valve assembly (not shown) in which a valve plate (not shown) is opened and closed according to the pressure of the refrigerant. .

For example, the valve assembly includes a gasket 60 on the left side of FIG. 1 and sequentially includes a suction lead (not shown), a valve plate (not shown), a discharge lead, and a discharge on the right side of the gasket 60. It consists of a gasket.

The flow path adjusting means 200 according to the present embodiment has a scroll shape wound multiple times in the radial direction of the expansion part 36 concentrically with the center of the oil hole 62.

The expansion portion 36 is configured in the form of expansion pipe with a radius increased toward the oil hole 62, the flow path adjusting means 200 is installed to be supported on the inside of the expansion portion (36).

Since the flow path adjusting means 200 needs to be variable in radius, the flow rate adjusting means 200 can easily adjust the amount of oil moved to the oil hole 62 according to the temperature change of the refrigerant, and thus, the flow rate adjusting means 200 is configured in the form shown in the drawing.

The flow path adjusting means 200 according to the present embodiment is, for example, a first variable part 210 and an extension of the first variable part 210 which are wound and extended radially outward from the center of the oil hole 62. And a second variable portion 220 extending radially outward at the end portion thereof, and a third variable portion 230 extending radially outwardly at the extended end of the second variable portion 220.

Bimetal is used as the first and second variable parts 210 and 220 as an example, and when the cross section is cut and viewed from above, the inner side has a high coefficient of thermal expansion and the outer side has a low coefficient of thermal expansion. Variable is made easily.

The flow path adjusting means 200 is formed in the form of a scroll-shaped band and extends in a predetermined width from the expansion part 36. In particular, the flow path adjusting means 200 has a radius of oil in the center portion facing the oil hole 62 in order to variably adjust the amount of oil moved to the oil hole 62 according to the temperature change of the refrigerant. It can contribute to the improvement of lubrication performance by adjusting the amount of oil moving to 62).

The first variable portion 210 is thermally expanded at a first temperature T1, the second variable portion 220 is thermally expanded at a second temperature T2, and the third variable portion 230 is Thermal expansion due to temperature changes is minimal. For example, bimetal is used for the first and second variable parts 210 and 220, and a general rapid material is used for the third variable part 230 rather than a bimetal material.

When the temperature of the refrigerant is low, the first variable part 210 decreases the radial change due to the coefficient of thermal expansion, thereby reducing the radius of the opening in the region facing the center of the oil hole 62.

In this case, since the amount of oil moved to the oil hole 62 is reduced due to the region generated after the first variable portion 210 is reduced, the oil does not move to the discharge chamber 22 unnecessarily, and the front housing 10 It is possible to stably maintain the lubrication for the components that require lubrication while staying inside the).

2 to 3, the first variable part 210 is wound around the second variable part 220 relatively more than the second variable part 220 so that a change in radius may occur when the thermal expansion occurs. ) Is increased.

In this case, the first variable part 210 may adjust the movement of the oil moved through the oil hole 62 more accurately, thereby achieving stable movement of the oil by using the expansion in the radial direction due to thermal expansion. .

For reference, FIG. 2 is the diameter of the oil hole 62 shown as a dotted line as it is, but if the thermal expansion does not occur in the first variable portion 210 at least the flow path of the oil hole 62 is opened, FIG. When the first and second variable parts 210 and 220 are thermally expanded in a high temperature operating condition, the opening size in the radial direction is expanded larger than the diameter of the oil hole 62 due to thermal expansion. One drawing.

For example, when the temperature of the refrigerant decreases, since the diameter change in the radial direction of the first variable part 210 decreases according to the coefficient of thermal expansion, a radius opening in an area facing the center of the oil hole 62 is indicated by an arrow in the figure. It is deformed in the direction (reduction direction) shown.

On the contrary, when the variable swash plate compressor is driven for a long time under high load conditions when the temperature of the outside air is high, such as in summer, the internal temperature increases rapidly.

Under these conditions, the oil is circulated entirely inside the variable swash plate compressor for stable lubrication due to friction and contact of individual components, thereby reducing the occurrence of failure due to improved durability and sticking.

In this embodiment, in this case, the oil is thermally expanded by the first variable portion 210 by the high temperature refrigerant, and the amount of oil moved to the oil hole 62 is increased to a region generated after the radius is increased.

Since the oil is moved to the inside of the rear housing 20 and circulated to the front housing 10 via a separate lubrication line, it prevents abrasion of the individual components and minimizes problems due to lack of oil, thereby improving durability. You can.

 The first temperature T1 of the first variable part 210 is thermally expanded at a temperature lower than the second temperature T2 of the second variable part 220, so that the radius is changed according to the temperature change of the refrigerant as described above. Thermal expansion is easily done in the direction.

Since the first and second variable parts 210 and 220 are all thermally expanded, the first and second variable parts 210 and 220 may have the same thermal expansion rate, or the first variable part 210 may have a thermal expansion rate for stability of movement of oil with respect to the oil hole 62. It can be configured large.

Unlike the first and second variable parts 210 and 220 described above, the third variable part 230 is not made of bimetal, and thus thermal expansion does not occur in the radial direction. The third variable part 230 maintains a state in which the first and second variable parts 210 and 220 are supported inside the expansion part 36 when thermal expansion occurs, so that the expansion part 36 is moved while oil is moved. This can prevent deviating or twisting in the.

Therefore, the flow path adjusting means 200 can stably move the oil to the oil hole 62 even with various temperature changes of the refrigerant.

The expansion part 36 is provided with a catching part 38 for preventing the separation of the flow path adjusting means 200.

The locking portion 38 is formed in a stepped shape, and since the third variable portion 230 is positioned inside the locking portion 36, the flow path adjusting means 200 is variable in the radial direction according to the temperature change of the refrigerant. Stable operating conditions can be maintained.

As described above, the present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely exemplary, and various modifications and equivalent embodiments of the present invention may be obtained by those skilled in the art. I understand that it is possible. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: front housing
12: crank seal
20: rear housing
30: cylinder block
40: swash plate
50: sheep scalp piston
60: gasket
200: right adjustment means
210: first variable part
220: second variable part
230: third variable part

Claims (9)

A front housing 10 having a crank seal 12 formed therein;
A rear housing 20 in which a discharge chamber 22 through which the refrigerant is discharged is formed;
Coupled between the front housing 10 and the rear housing 20, a plurality of cylinders
A cylinder block 30 in which a bore 32 is formed;
A swash plate 40 installed in the swash plate chamber 2 in the cylinder block 30 and integrally rotating with the drive shaft 3;
A plurality of pistons 50 reciprocating in the cylinder bore 2 by the inclination of the swash plate 40;
A gasket (60) provided between the cylinder block (30) and the rear housing (20) and having an oil hole (62) through which oil contained in the refrigerant moves;
An oil passage (34) provided in the cylinder block (30) and communicating with the crank seal (12) and the oil hole (62); And
Is provided with a flow path adjusting means 500 disposed between the oil passage 34 and the oil hole 62,
The flow path adjusting means 200 adjusts the amount of oil contained in the coolant moving to the oil hole 62 by varying a radius of the communication facing the oil hole 62 according to the temperature change of the coolant. Variable swash plate compressor. According to claim 1,
The cylinder block 30 is formed with an extension 36 extending toward the gasket 60 at an end of the oil passage 34 facing the oil hole 62 of the gasket 60. A variable swash plate compressor provided with the flow path adjusting means (200) at (36). The method of claim 2,
The flow path adjusting means (200) is a variable swash plate compressor consisting of a scroll shape wound in the radial direction of the expansion portion (36) concentrically around the center of the oil hole (62). The method of claim 3, wherein
The flow path adjusting means 200 includes: a first variable part 210 wound and extending radially outward from the center of the oil hole 62;
A second variable part 220 extending radially outward from an extended end of the first variable part 210;
A variable swash plate compressor including a third variable portion 230 extending radially outwardly from the extended end of the second variable portion (220). The method of claim 4, wherein
The first variable portion 210 is thermally expanded at a first temperature T1, the second variable portion 220 is thermally expanded at a second temperature T2, and the third variable portion 230 is formed. Is the minimum thermal expansion caused by temperature changes,
The first temperature (T1) of the first variable portion 210 is a variable swash plate type compressor is thermal expansion at a temperature lower than the second temperature (T2) of the second variable portion (220). The method of claim 4, wherein
The first variable portion (210) is a variable swash plate type compressor that is wound relatively more than the second variable portion 220 increases the radius change due to thermal expansion. The method of claim 6,
The first and second variable parts (210, 220) is a variable swash plate type compressor using a bimetal. The method of claim 4, wherein
The flow path adjusting means 200 is a variable swash plate type compressor consisting of a strip form. The method of claim 2,
The expansion unit 36 is a variable swash plate type compressor having a catching portion 38 for preventing the passage of the passage adjusting means 200 is formed.

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