Electric compressor

Abstract

The present invention relates to an electric compressor comprising: a compressor including a housing in which a suction chamber, a back pressure chamber, a compression chamber and a discharge chamber are formed, a driving part that includes a stator with an inner peripheral surface that faces the outer peripheral surface of a rotary shaft rotatably supported in the housing and a rotor that is coupled to the outer peripheral surface of the rotary shaft so as to rotate together with the rotary shaft by means of induced electromotive force with the stator, a fixed scroll integrated and fixed in the housing, an orbiting scroll that engages with the fixed scroll so as to form the compression chamber while orbiting by means of the driving part, and a control part in which a driving circuit and an element for operating the driving part are arrayed on a PCB integrated into one side of the housing; and a pressure-tight unit which is provided in the compression chamber so as to maintain constant pressure of the back pressure chamber within a set range according to the motion of the orbiting scroll when the orbiting scroll is operated and, simultaneously, which maintains airtightness of the back pressure chamber, wherein shape deformation and restoration are facilitated during assembly, and back pressure is maintained and a load applied to a thrust surface is reduced such that the performance of the compressor can be improved.

Description

electric compressor

[0001] The present invention relates to an electric compressor, and more particularly, to an electric compressor that is easy to change shape and restore during assembly, maintains back pressure, and reduces the load on a thrust surface, thereby improving the performance of the compressor.

[0002] An electric compressor may typically include a fixed scroll fixed to a housing and an orbiting scroll that orbits relative to the fixed scroll.

[0003] The above-described fixed scroll may include a fixed base plate and a fixed spiral wall protruding from the fixed base plate.

[0004] The aforementioned orbital scroll may include a orbital base plate and an orbital spiral wall protruding from the orbital base plate.

[0005] Here, the fixed spiral wall and the rotating spiral wall are combined to form a compression chamber.

[0006] The orbital motion of these rotating scrolls reduces the volume of the compression chamber and compresses the refrigerant.

[0007] At this time, an opposing wall may be placed inside the housing and fixed to the housing in a compression chamber formed between the rotating scroll and the fixed scroll.

[0008] A back pressure region is formed between the opposing wall and the orbiting scroll, and the back pressure inside the back pressure region can elastically support the orbiting scroll toward the fixed scroll.

[0009] An annular sealing member could be placed between these rotating scrolls and the opposing wall.

[0010] Here, the pivoting scroll may include a retaining member that holds the sealing member.

[0011] At this time, the sealing member may include a rubber portion that is elastically deformed within the retaining member and a resin portion made of a material that is harder than the rubber portion.

[0012] However, in the orbiting scroll structure of this structure, the shape of the rubber part that is elastically deformed within the groove formed in the holding part, that is, the orbiting scroll, includes a flat surface that comes into contact with the resin part, and a space is formed between the holding part and the rubber part to allow the rubber part to be elastically deformed within the holding part. However, this orbiting scroll structure has a problem in that it is difficult to elastically deform the rubber part when considering the hardness for maintaining the shape of the rubber part.

[0013] Therefore, the problem of compressor performance degradation was encountered due to an increase in the load applied to the thrust surface of the back pressure chamber.

[0014] Prior art literature

[0015] (Patent Document 1) Registered Patent No. 10-1467024

[0016] The present invention was invented to improve the above-mentioned problems, and to provide an electric compressor that is easy to change and restore in shape during assembly, maintains back pressure, and reduces the load on the thrust surface, thereby improving the performance of the compressor.

[0017] In order to achieve the above object, the present invention provides an electric compressor comprising a housing having a suction chamber, a back pressure chamber, a compression chamber, and a discharge chamber formed therein, a driving unit including a stator having an inner surface facing an outer surface of a rotating shaft rotatably supported within the housing, and a rotor coupled to the outer surface of the rotating shaft and rotating together with the rotating shaft by an induced electromotive force with the stator, a fixed scroll built into and fixed to the housing, an orbiting scroll that forms the compression chamber by interlocking with the fixed scroll while being rotated by the driving unit, and a control unit having a driving circuit and elements for operating the driving unit arranged on a PCB built into one side of the housing; and a pressure-tightness unit provided in the compression chamber to maintain a constant pressure in the back pressure chamber within a set range according to the behavior of the orbiting scroll when the orbiting scroll is in operation, while maintaining the back pressure chamber airtight.

[0018] Here, it is characterized in that it further includes a thrust plate mounted on one side of the pressure chamber and in contact with an end surface of the fixed scroll and in contact with a part of the pressure seal unit.

[0019] At this time, it further includes a thrust plate mounted on one side of the pressure chamber and in contact with an end surface of the fixed scroll and in contact with a part of the pressure seal unit, and when the orbiting scroll is in operation, the orbiting scroll moves adjacent to the thrust plate.

[0020] In addition, when the orbiting scroll is in operation, the orbiting scroll moves adjacent to one side of the pressure chamber, and thus a part of the pressure-tight unit is characterized in that it allows a shape deformation.

[0021] In addition, the pressure seal unit is characterized in that it includes a first part which is mounted on one side of the back pressure chamber and has a sealing surface that is in pressure contact with the thrust plate when the orbiting scroll is in operation, while maintaining the back pressure of the back pressure chamber, and is arranged on the end side of the orbiting scroll, and a second part which is in contact with the first part and is arranged on the end of the orbiting scroll, and maintains the pressure of the back pressure chamber while allowing shape deformation as the first part is in pressure contact with the thrust plate when the orbiting scroll is in operation.

[0022] According to the present invention having the above configuration, the following effects can be achieved.

[0023] First, the present invention will be able to improve the performance of the compressor by making it easy to change and restore the shape during assembly, maintaining the back pressure, and reducing the load on the thrust surface.

[0024] In addition, the present invention can improve compressor performance and durability by minimizing thrust surface friction loss by allowing shape deformation and restoration with a relatively simple structure as well as sealing of the back pressure chamber.

[0025] Figure 1 is a cross-sectional conceptual diagram showing the overall structure of an electric compressor according to one embodiment of the present invention.

[0026] Figure 2 is a cross-sectional conceptual diagram showing a structure in which a compressor seal unit, which is a main part of an electric compressor according to one embodiment of the present invention, allows shape deformation according to the behavior of a rotating scroll.

[0027] Figures 3 to 6 are cross-sectional conceptual diagrams showing the structure of the second part of the compressor seal unit, which is a main part of an electric compressor according to various embodiments of the present invention.

[0028] <Explanation of symbols>

[0029] 100...compressor

[0030] 110...Housing

[0031] 110a...front housing

[0032] 110b...main housing

[0033] 110c...rear housing

[0034] 111...inhalation chamber

[0035] 112...back pressure room

[0036] 113...Compression chamber

[0037] 114...spit out room

[0038] 120...Drivetrain

[0039] 121...rotation axis

[0040] 122...stator

[0041] 123...rotor

[0042] 125...Eccentric Bush

[0043] 131...Fixed scroll

[0044] 132...Rotating Scroll

[0045] 140...control unit

[0046] 200...pressure-tight unit

[0047] 210...Part 1

[0048] 211...pressure surface

[0049] 220...Part 2

[0050] 221...First agent

[0051] 221a...first outer edge

[0052] 221b...first inner edge

[0053] 222...Second agent

[0054] 222a...2nd outer edge

[0055] 222b...2nd inner edge

[0056] 223...Third agent

[0057] 223a...third outer edge

[0058] 223b...3rd inner edge

[0059] 224...4th agent

[0060] 224a...4th outer edge

[0061] 224b...4th inner edge

[0062] 225...Fifth agent

[0063] 226...6th agent

[0064] 227...Seventh agent

[0065] 227a...7th outer edge

[0066] 227b...7th inner edge

[0067] 228...8th agent

[0068] 228a...8th outer edge

[0069] 228b...8th inner edge

[0070] 229...connection

[0071] 230...thrust plate

[0072] 240...home

[0073] The advantages and features of the present invention and the method for achieving them will become clear with reference to the embodiments described in detail below together with the accompanying drawings.

[0074] However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms.

[0075] The embodiments herein are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention.

[0076] And the present invention is defined only by the scope of the claims.

[0077] Accordingly, in some embodiments, well-known components, well-known operations, and well-known techniques are not specifically described to avoid obscuring the present invention.

[0078] Additionally, throughout the specification, the same reference numerals refer to the same components, and the terminology used (referred to) in this specification is for the purpose of describing embodiments and is not intended to limit the present invention.

[0079] In this specification, the singular includes the plural unless specifically stated otherwise in the phrase, and the reference to an element or action as “including (or comprising)” does not exclude the presence or addition of one or more other elements or actions.

[0080] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in the sense commonly understood by a person of ordinary skill in the art to which the present invention belongs.

[0081] Also, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless they are defined otherwise.

[0082] Hereinafter, a preferred embodiment of the present invention will be described with reference to the attached drawings.

[0083] First, FIG. 1 is a cross-sectional conceptual diagram illustrating the overall structure of an electric compressor according to one embodiment of the present invention.

[0084] In addition, FIG. 2 is a cross-sectional conceptual diagram showing a structure in which a compressor seal unit (200), which is a main part of an electric compressor according to one embodiment of the present invention, allows shape deformation according to the behavior of a rotating scroll (132).

[0085] In addition, FIGS. 3 to 6 are cross-sectional conceptual diagrams showing the structure of the second part (220) of the compressor seal unit (200), which is a main part of an electric compressor according to various embodiments of the present invention.

[0086] As shown in FIGS. 1 and 2, the present invention can be applied to an embodiment of a structure in which a pressure seal unit (200) is provided in a compressor (100).

[0087] First, the compressor (100) may include a housing (110) having a suction chamber (111), a back pressure chamber (112), a compression chamber (113), and a discharge chamber (114) formed therein.

[0088] In addition, the compressor (100) may include a driving unit (120) including a stator (122) having an inner surface facing an outer surface of a rotational shaft (121) that is rotatably supported inside a housing (110) and a rotor (123) that is coupled to the outer surface of the rotational shaft (121) and rotates together with the rotational shaft (121) by an induced electromotive force with the stator (122).

[0089] In addition, the compressor (100) may include a fixed scroll (131) built into and fixed to the housing (110), and a rotating scroll (132) that is rotated by a driving unit (120) and engages with the fixed scroll (131) to form a compression chamber (113).

[0090] In addition, the compressor (100) may include a control unit (140) in which a driving circuit (not shown) and elements (not shown) for operating the driving unit (120) are arrayed on a PCB (not shown) built into one side of the housing (110).

[0091] Meanwhile, the pressure seal unit (200) is provided in the compression chamber (113) to maintain the pressure of the back pressure chamber (112) within a set range according to the movement of the orbiting scroll (132) when the orbiting scroll (132) is in operation, while maintaining the airtightness of the back pressure chamber (112).

[0092] The present invention can be applied to the above-described embodiments, and of course, the following various embodiments can also be applied.

[0093] First, the housing (110) is composed of a front housing (110a), a main housing (110b), and a rear housing (110c) sequentially from the left side of FIG. 1, as shown in FIG. 1.

[0094] Here, the suction chamber (111) is formed across the front housing (110a) and the main housing (110b), and the back pressure chamber (112), the compression chamber (113), and the discharge chamber (114) are formed inside the rear housing (110c).

[0095] At this time, the rotary scroll (132) can be connected to the aforementioned rotary shaft (121) and the eccentric bush (125) so that it can receive driving force from the rotary shaft (121).

[0096] Meanwhile, a thrust plate (230) is mounted on one side of the pressure chamber (112) to come into contact with the end surface of the fixed scroll (131) and may come into contact with a part of the pressure seal unit (200) to be described later.

[0097] Accordingly, it can be seen that when the turning scroll (132) is in operation, the turning scroll (132) moves adjacent to the thrust plate (230) as shown in Fig. 2(b).

[0098] In addition, it can be seen that when the orbiting scroll (132) is in operation, the orbiting scroll (132) moves adjacent to one side of the pressure chamber (112), thereby allowing a part of the pressure seal unit (200) to undergo shape deformation.

[0099] Meanwhile, this pressure-sealing unit (200) may include first and second parts (210, 220).

[0100] The first section (210) has a pressure surface (211) that is mounted on one side of the pressure chamber (112) and seals the thrust plate (230) that comes into pressure contact with the end surface of the fixed scroll (131) when the orbiting scroll (132) is in operation, thereby maintaining the pressure of the pressure chamber (112). The pressure surface (211) is disposed on the end side of the orbiting scroll (132).

[0101] The second part (220) is arranged at the end of the orbiting scroll (132) in contact with the first part (210), and is provided to perform the role of maintaining the pressure in the back pressure chamber (112) while allowing shape deformation as the first part (210) comes into pressure contact with the thrust plate (230) when the orbiting scroll (132) is in operation.

[0102] Here, the pressure seal unit (200) may further include a recessed portion (240) formed in the end face of the rotating scroll (132).

[0103] Accordingly, it can be seen that the second part (220) is built along the formation direction of the groove part (240), and the first part (210) is placed adjacent to the second part (220) so that the thrust plate (230) and the pressure surface (211) face each other.

[0104] At this time, it can be seen that the first part (210) is made of synthetic resin with a cross-section formed into a square shape, and one side of the square shape forms a pressure surface (211).

[0105] And, the second part (220) is made of rubber or synthetic rubber whose cross-section is formed into a semicircular shape or an arc shape.

[0106] In addition, the distance between the two ends of the semicircular or arc-shaped part (220) is reduced as shown in Fig. 2(b) by contact with the thrust plate (230) side of the end of the linear scroll according to the behavior of the rotating scroll (132).

[0107] In addition, it can be seen that the second part (220) restores the distance between the two ends of the semicircular or arc shape to the initial state as shown in Fig. 2(a) when the operation of the rotary scroll (132) is stopped.

[0108] Looking more specifically at the second part (220), it can be seen that it has a semicircular or arc-shaped cross-section with an outer circumference and an inner circumference and a certain thickness, and one edge of the two ends of the semicircular or arc-shaped shape is in contact with the inner surface of the grooved portion (240), and the other edge of the two ends of the semicircular or arc-shaped shape is in contact with the inner surface of the first part (210).

[0109] Accordingly, the outer surface formed on the opposite side to the inner surface of the first part (210) forms a pressure surface (211) that comes into contact with the thrust plate (230) according to the operation of the rotary scroll (132).

[0110] In other words, the second part (220) having a cross-section of a semicircular shape or an arc shape is located on the inner surface of the grooved part (240), and the first part (210) is installed toward the outer surface of the grooved part (240), that is, toward the thrust plate (230).

[0111] The pressure surface (211) of the first part (210) is in close contact with the thrust plate (230) when the rotary scroll (132) is in operation, so that the pressure in the pressure chamber (112) is maintained by sealing.

[0112] When the orbiting scroll (132) is in operation, the second part (220) seated in the groove (240) maintains the pressure in the pressure chamber (112) by repeatedly contracting and expanding according to the movement of the orbiting scroll (132).

[0113] At this time, the second part (220) having a cross-section of a semicircular shape or an arc shape smoothly contracts and expands due to internal pressure, and when the first part (210) is in close contact with the thrust plate (230), the elastic force of the second part (220) is minimized, so that a constant back pressure and airtightness can be maintained while minimizing the thrust load, and thus the performance of the compressor (100) can be maintained as well as improved.

[0114] That is, when the first part (210) is in close contact with the thrust plate (230), the elastic force of the second part (220) having an arc-shaped cross-section is also minimized, thereby minimizing the thrust load and maintaining the tightness of the back pressure, thereby improving the overall performance of the compressor.

[0115] The reason why the cross-sectional shape of the second part (220) is manufactured to be a semicircle or an arc shape is to secure an elastic sealing structure by allowing deformation and restoration of shape due to elasticity, but also because the second part (220) generates an elastic repulsive force in the direction of pushing the first part (210) against the back pressure applied toward the inside of the back pressure chamber (112), that is, toward the groove (240), thereby implementing sealing.

[0116] In other words, when the second part (220) is manufactured to have a semicircular or arc-shaped cross-section and is accommodated in the grooved part (240), the back pressure is applied toward the grooved part (240), thereby generating elastic force in the direction in which the semicircular or arc-shaped cross-section of the second part (220) pushes outward, thereby strengthening the sealing.

[0117] Meanwhile, the second part (220) can be designed in various ways, such as by being manufactured in various structures as shown in FIGS. 3 to 6, in addition to the semicircular or arc-shaped structures described above.

[0118] That is, the second part (220) may be designed to be modified and applied by overlapping the second part having a cross-section of a semicircular shape or an arc shape as shown in FIGS. 1 and 2, with the shape reversed upside down, as shown in FIG. 3.

[0119] Specifically, the second part (220) may include a first working body (221) having a first outer edge (221a) and a first inner edge (221b) and having a cap-shaped cross-section formed in an overall '∩' shape, i.e., a semicircle or arc shape.

[0120] And, the second part (220) may include a second working body (222) having a second outer edge (222a) and a second inner edge (222b) and having a cup-shaped cross-section formed in an overall '∪' shape, i.e., a semicircle or arc shape.

[0121] In other words, the second part (220) illustrated in FIG. 3 can be designed to be deformed and applied in a structure in which the cap-shaped cross-section of the first working body (221) and the cup-shaped cross-section of the second working body (222) overlap each other.

[0122] Meanwhile, the second part (220) may also apply an embodiment of a structure in which a third action body (223) and a fourth action body (224), which are separated from each other as shown in FIG. 4, are accommodated in a groove (240).

[0123] That is, the second part (220) can be designed to be deformed and applied in such a way that the convex portions of the third working body (223) having a cap-shaped cross-section and the fourth working body (224) having a cup-shaped cross-section are arranged in a reversed manner.

[0124] Specifically, the second part (220) may include a third working body (223) having a third outer edge (223a) and a third inner edge (223b) and having a cap-shaped cross-section formed in an overall '∩' shape, i.e., a semicircle or arc shape.

[0125] And, the second part (220) may include a fourth working body (224) having a fourth outer edge (224a) and a fourth inner edge (224b) and having a cup-shaped cross-section formed in an overall '∪' shape, i.e., a semicircle or arc shape.

[0126] Meanwhile, the second part (220) may be designed to have a structure with a cross section in the shape of an 'X' letter by intersecting the fifth and sixth working bodies (225) and the sixth working body (226) in the shape of a straight bar as shown in Fig. 5.

[0127] Meanwhile, the second part (220) is arranged so that the convex parts of each of the working bodies having a cap-shaped cross-section as shown in FIG. 4 and the working bodies having a cup-shaped cross-section are arranged side by side, as shown in FIG. 6, but it is possible to modify and apply the structure in which the convex parts of each of the working bodies are interconnected.

[0128] Specifically, the second part (220) may include a seventh working body (227) having a seventh outer edge (227a) and a seventh inner edge (227b) and having a cross-section of a cap shape formed in an overall '∩' shape, i.e., a semicircle or arc shape.

[0129] And, the second part (220) may include an eighth working body (228) having an eighth outer edge (228a) and an eighth inner edge (228b) and having a cup-shaped cross-section formed in an overall '∪' shape, i.e., a semicircle or arc shape.

[0130] Additionally, the second part (220) may include a connecting portion (229) formed by interconnecting the convex portions of each of the seventh working body (227) and the eighth working body (228) described above.

[0131] The structure according to the various embodiments of the second part (220) described above is not limited to the structure of FIGS. 3 to 6, and various other applicable applications and modified designs are also possible.

[0132] As described above, it can be seen that the present invention has as its basic technical idea the provision of an electric compressor that is easy to change and restore shape during assembly, maintains back pressure, and reduces the load on the thrust surface, thereby improving the performance of the compressor.

[0133] And, of course, many other modifications and applications are also possible for those with common knowledge in the industry within the scope of the basic technical idea of ​​the present invention.

Claims

1. A compressor including a housing having a suction chamber, a back pressure chamber, a compression chamber, and a discharge chamber formed therein, a driving unit including a stator having an inner surface facing an outer surface of a rotary shaft rotatably supported inside the housing, and a rotor coupled to the outer surface of the rotary shaft and rotating together with the rotary shaft by induced electromotive force with the stator, a fixed scroll built into and fixed in the housing, a rotating scroll that forms the compression chamber by engaging with the fixed scroll while rotating by the driving unit, and a control unit having a driving circuit and elements for operating the driving unit arranged on a PCB built into one side of the housing; and An electric compressor characterized by including a pressure sealing unit which is provided in the compression chamber and maintains the pressure of the back pressure chamber constant within a set range according to the behavior of the orbiting scroll when the orbiting scroll is in operation, while maintaining the airtightness of the back pressure chamber.

2. In claim 1, An electric compressor characterized in that it further includes a thrust plate mounted on one side of the above pressure chamber and in contact with an end surface of the above fixed scroll and in contact with a part of the above pressure seal unit.

3. In claim 1, It further includes a thrust plate mounted on one side of the above pressure chamber and in contact with the end face of the above fixed scroll and in contact with a part of the above pressure seal unit, An electric compressor, characterized in that when the orbiting scroll is in operation, the orbiting scroll moves adjacent to the thrust plate.

4. In claim 1, An electric compressor characterized in that when the orbiting scroll is in operation, the orbiting scroll moves adjacent to one side of the back pressure chamber, thereby allowing a part of the pressure seal unit to undergo shape deformation.

5. In claim 1, The above pressure seal unit is, A first section, which is mounted on one side of the pressure chamber and has a sealing surface that is in pressure contact with the thrust plate when the orbiting scroll is in operation, so that the pressure of the pressure chamber is maintained, and is arranged on the end side of the orbiting scroll; An electric compressor characterized by including a second portion which is arranged at an end of the orbiting scroll in contact with the first portion and which maintains the pressure in the back pressure chamber while allowing a shape deformation as the first portion is pressurized and comes into contact with the thrust plate when the orbiting scroll is in operation.

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