CN115539392A - Horizontal scroll compressor - Google Patents

Abstract

The invention provides a horizontal scroll compressor, which comprises a shell, a partition plate and a scroll assembly, wherein the partition plate divides an inner space defined by the shell into a high-pressure side space and a low-pressure side space, a fixed scroll part of the scroll assembly comprises a gas outlet for discharging compressed working fluid to the high-pressure side space, the fixed scroll part can move for a preset distance relative to the shell along the direction of a horizontal central axis, a first back pressure cavity and a second back pressure cavity which are hermetically separated from each other and are communicated with the high-pressure side space are arranged between the fixed scroll part and the partition plate, the first back pressure cavity is positioned to be offset towards one side of a horizontal plane where the horizontal central axis is located, the second back pressure cavity is positioned to be offset towards the other side of the horizontal plane, the first back pressure cavity is at least partially positioned above the horizontal plane, and the first back pressure cavity is also communicated with the gas outlet. According to the horizontal scroll compressor, the overlarge oil circulation rate can be avoided, and the stable and reliable work of the scroll component can be ensured.

Description

Horizontal scroll compressor

Technical Field

The present invention relates to the field of horizontal scroll compressors, and more particularly, to a horizontal scroll compressor having at least two back pressure chambers.

Background

This section provides background information related to the present invention, which does not necessarily form the prior art.

In a horizontal compressor, it is usually necessary to build oil separation and return functions in the high-pressure discharge chamber of the compressor to avoid a large oil circulation rate. The common oil distribution function is realized by arranging an oil distribution pipe in the top cover. The working fluid discharged from the central exhaust port of the scroll mechanism of the compressor enters the oil distribution pipe from the air inlet at the middle upper part of the oil distribution pipe, and the oil separated by the oil distribution pipe falls into the oil pool from the oil return hole at the bottom of the oil distribution pipe and returns to the low-pressure air suction area of the scroll compressor through the oil return channel in the scroll mechanism. Because the central discharge port of the scroll mechanism is relatively close to the oil sump, the working fluid tends to carry oil from the oil sump away from the scroll compressor.

If the position of the central exhaust port of the scroll mechanism is eccentrically arranged to be close to the upper part of the scroll mechanism, for a horizontal compressor adopting a floating fixed scroll design, the acting force of the exhaust port close to the upper part of the scroll mechanism on the fixed scroll does not act on the center of the scroll, so that the fixed scroll is easy to overturn.

Accordingly, it is desirable to provide an improved horizontal scroll compressor which is capable of not only improving oil separation efficiency and avoiding an excessive oil circulation rate, but also securing stability of a floating fixed scroll.

Disclosure of Invention

A general summary of the invention is provided in this section, and is not a comprehensive disclosure of the full scope of the invention or all of the features of the invention.

It is an object of the present invention to provide an efficient horizontal scroll compressor in which the discharge port of the scroll mechanism is offset upwardly with respect to the horizontal plane in which the horizontal central axis of the compressor lies, thereby being remote from the oil sump, reducing the amount of oil carried away by the working fluid from the oil sump and/or improving the oil separation efficiency to avoid excessive oil circulation rates.

Another object of the present invention is to provide a reliable horizontal scroll compressor, in which a back portion of the floating fixed scroll is provided with a back pressure chamber corresponding to the discharge port of the scroll mechanism and upwardly offset with respect to a horizontal plane on which the horizontal central axis is located, and is further provided with another back pressure chamber downwardly offset with respect to the horizontal plane on which the horizontal central axis is located, so that the floating fixed scroll is balanced in stress and the compressor operates stably.

According to one aspect of the present invention, there is provided a horizontal scroll compressor including: a housing defining an interior space of the horizontal scroll compressor; a partition plate dividing the inner space into a high pressure side space and a low pressure side space; and a scroll assembly including an orbiting scroll member and a non-orbiting scroll member, a series of compression chambers formed between the orbiting and non-orbiting scroll members, the non-orbiting scroll member including a discharge port for discharging a compressed working fluid from the scroll assembly to a high pressure side space, wherein the non-orbiting scroll member is configured to be movable relative to the housing by a predetermined distance in a direction of a horizontal central axis of the horizontal scroll compressor, wherein a first back pressure chamber and a second back pressure chamber, which are hermetically spaced from each other, for urging the non-orbiting scroll member toward the orbiting scroll member are provided between the non-orbiting scroll member and the partition plate, the first back pressure chamber is positioned to be offset toward one side of a horizontal plane in which the horizontal central axis is located, the second back pressure chamber is positioned to be offset toward the other side of the horizontal plane, the first back pressure chamber is at least partially located above the horizontal plane, the first back pressure chamber and the second back pressure chamber are both communicated with the high pressure side space, and the first back pressure chamber is also communicated with the discharge port.

Optionally, the first back pressure chamber and the second back pressure chamber are located radially opposite to each other about the horizontal central axis.

Optionally, in a transverse cross-section perpendicular to the horizontal central axis, a product of a cross-sectional area of the first back pressure chamber and a distance of a center of the first back pressure chamber to the horizontal central axis is equal to a product of a cross-sectional area of the second back pressure chamber and a distance of a center of the second back pressure chamber to the horizontal central axis.

Optionally, the number of the second back pressure cavities is two, and in a transverse cross section perpendicular to the horizontal central axis, a connecting line between the center of the first back pressure cavity and the centers of the two second back pressure cavities forms an isosceles triangle.

Alternatively, an oil sump containing oil is provided in a region of the high-pressure side space below the horizontal plane, and a first orifice communicating with the first back pressure chamber and a second orifice communicating with the second back pressure chamber are formed in the partition plate.

Optionally, an oil return passage communicating with the second back pressure chamber is provided in the non-orbiting scroll, and the oil in the oil sump is returned to the low pressure side space via the second orifice, the second back pressure chamber, and the oil return passage.

Optionally, an oil return passage directly communicating with the low-pressure side space is further formed in the partition plate, and the oil in the oil sump is returned to the low-pressure side space via the oil return passage.

Optionally, the ratio of the inner diameter of the oil return channel to its length is less than or equal to 1.

Optionally, a third back pressure chamber hermetically separated from the first back pressure chamber and the second back pressure chamber for pushing the non-orbiting scroll part toward the orbiting scroll part is further provided between the non-orbiting scroll part and the partition plate, the third back pressure chamber communicating with a compression chamber having an intermediate pressure among the compression chambers, and the first back pressure chamber and the second back pressure chamber being provided in the third back pressure chamber.

Alternatively, the non-orbiting scroll member includes a main body portion and a cover plate portion that are separate bodies, and the exhaust port is formed at a position of the cover plate portion that is above the horizontal plane.

Optionally, an oil distribution pipe is arranged in the high-pressure side space, and the oil distribution pipe is provided with an air inlet hole positioned above the horizontal plane and an oil return hole positioned at the bottom of the oil distribution pipe.

Optionally, the first and second back pressure chambers are located above and below the horizontal plane, respectively.

Generally, the horizontal scroll compressor according to the present invention brings at least the following advantageous effects: the back of floating fixed vortex is provided with the back pressure cavities which are positioned on the upper side and the lower side of the horizontal central axis, so that the oil in an oil pool can be effectively prevented from being taken away by working fluid in the discharging process, and overturning moment can be prevented from being generated on the vortex mechanism, and the horizontal compressor can run efficiently and reliably.

Drawings

The foregoing and additional features and characteristics of the present invention will become more apparent from the following detailed description, taken with reference to the accompanying drawings, which are given by way of example only and which are not necessarily drawn to scale. In the drawings, like reference numerals are used to indicate like parts, and in which:

FIG. 1 shows a partial longitudinal cross-sectional view of a horizontal scroll compressor according to a first embodiment of the present invention;

fig. 2 is a perspective view illustrating a non-orbiting scroll of a horizontal type scroll compressor according to a first embodiment of the present invention;

FIG. 3 illustrates a top view of a non-orbiting scroll of a horizontal scroll compressor according to a first embodiment of the present invention;

FIG. 4 illustrates a cross-sectional view of the non-orbiting scroll taken along section line C-C in FIG. 3;

FIG. 5 shows a partial longitudinal cross-sectional view of a horizontal scroll compressor according to a second embodiment of the present invention;

FIG. 6 shows an enlarged detail view of area A in FIG. 5; and

fig. 7 shows a partial longitudinal sectional view of the horizontal scroll compressor in the comparative example.

Detailed Description

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, fig. 1 to 6. Corresponding components or parts are designated by the same reference numerals throughout the several views. The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. In the following description, the "horizontal central axis direction" refers to a direction in which the central axis of the horizontal scroll compressor is located, which is a direction parallel to a horizontal plane in a natural state. The "horizontal plane on which the horizontal central axis lies" means a plane including the central axis of the horizontal scroll compressor and parallel to the horizontal plane in the natural state.

Fig. 1 shows a horizontal turbocompressor according to a first embodiment of the invention, in particular illustrating the configuration of the discharge end of the horizontal scroll compressor. As shown in fig. 1, the horizontal type turbo compressor 100 includes a casing 110 defining an inner space of the compressor. The housing 110 may include a cylindrical portion 112 at a middle section, and a top cover 114 and a bottom cover (not shown) at both axial ends of the cylindrical portion 112. The top cover 114 and the bottom cover are fixedly coupled to the cylinder 112 to enclose an inner space of the compressor together with the cylinder 112. An intake port (not shown) for sucking the working fluid is provided in the cylindrical portion 112, and an exhaust port for discharging the compressed working fluid out of the compressor is provided in the head cover 114. A partition plate 116 extending substantially in the lateral direction (i.e., the direction perpendicular to the horizontal center axis direction of the horizontal scroll compressor) is further provided between the cylindrical portion 112 and the top cover 114, thereby partitioning the internal space defined by the housing 110 into a high-pressure side space and a low-pressure side space. Specifically, the space between the top cover 114 and the partition plate 116 constitutes a high-pressure side space, and the space between the partition plate 116 and the bottom cover constitutes a low-pressure side space. A motor, a rotating shaft, and a scroll assembly are disposed in the low pressure side space, the motor driving the scroll assembly through the rotating shaft to compress a working fluid.

The compressed working fluid is discharged from the low pressure side space to the high pressure side space, and is usually mixed with oil droplets. Before the working fluid exits the compressor, it is necessary to separate and recover the oil therein to avoid excessive oil circulation rate in the system, affecting the performance of the system's heat exchangers, or causing the compressor to run out of oil. Accordingly, a substantially laterally extending oil distribution pipe 140 is provided in the high pressure side space, and the oil distribution pipe 140 includes a working fluid outlet at the top of the oil distribution pipe, an oil return hole 144 at the bottom of the oil distribution pipe, and an air inlet 142 on the side wall of the oil distribution pipe. The working fluid outlet of the oil distribution tube 140 communicates with an exhaust port on the top cover 114, and the oil distribution tube 140 may include structure therein for separating oil from gas. The mixture of the high pressure working fluid (gas) and the oil (liquid) enters the oil distribution pipe 140 from the gas inlet 142 of the oil distribution pipe 140, the oil distribution pipe 140 separates the working fluid from the oil, the separated working fluid is discharged through the working fluid outlet of the oil distribution pipe, and the separated oil drops to the oil sump 150 at the bottom of the high pressure side space from the oil return hole 144 of the oil distribution pipe. The oil sump 150 communicates with the low pressure side space through an oil return passage 152 provided in the scroll assembly, and oil accumulated in the oil sump 150 is returned to the low pressure side space via the oil return passage 152 under the pressure difference between the high pressure side space and the low pressure side space to cool and lubricate components in the low pressure side space.

The oil return channel 152 is preferably configured as a microchannel sized to: the oil is cooled and lubricated better by passing through the oil return passage 152 at a reduced temperature and pressure, and/or the working fluid in the high pressure side space is prevented from leaking to the low pressure side space in a certain case. For example, the ratio of the inner diameter to the length of the oil return passage is less than or equal to 1. In addition, it is preferable that the air inlet 142 is closer to the working fluid outlet than the oil return hole 144, that is, the air inlet 142 is located at the middle upper portion of the oil distribution pipe 140, so that the air inlet 142 is far away from the oil sump 150 to reduce the possibility of oil being taken away from the compressor by the working fluid.

The specific structure of the scroll assembly of the low pressure side space will be described with reference to fig. 4. The scroll assembly includes an orbiting scroll member 120 and a non-orbiting scroll member 130. Orbiting scroll member 120 includes an orbiting scroll end plate 124 and a spiral vane 122 formed on one side of orbiting scroll end plate 124. The non-orbiting scroll member 130 is formed by a body portion 133 and a cover plate portion 136 together, wherein the body portion 133 includes a non-orbiting scroll end plate 134 and a spiral vane 132 formed at one side of the non-orbiting scroll end plate 134. The spiral vanes 132 of the non-orbiting scroll member and the spiral vanes 122 of the orbiting scroll member 120 mesh with each other to form a series of compression chambers between the non-orbiting scroll member 130 and the orbiting scroll member 120 for compressing the working fluid. The cover plate portion 136 is located on the opposite side of the non-orbiting scroll end plate 134 from its spiral vanes 132. A central discharge chamber 137 (fig. 4) is formed between the cover plate 136 and the body 133, the central discharge chamber 137 is capable of communicating with a central discharge port 135 located at the center of the orbiting scroll end plate 134, and a discharge valve 139 (fig. 4) for opening and closing the central discharge port 135 is further provided in the central discharge chamber 137. The cover plate 136 is provided with an exhaust port 138 for communicating the central exhaust chamber 137 and the high-pressure side space. The exhaust ports 138 are disposed above a horizontal plane in which the horizontal central axis is located (at least the centers of the exhaust ports 138 are disposed above the horizontal plane in which the horizontal central axis is located). The cover plate 136 further has a first oil return passage section 1521 provided therein, the main body 133 has a second oil return passage end 1521 provided therein, and the first oil return passage section 1521 and the second oil return passage section 1522 are sealingly connected by a self-adaptive seal, thereby collectively constituting the oil return passage 152 for guiding oil from the oil sump 150 of the high-pressure side space back to the low-pressure side space. To be remote from the oil distribution pipe to reduce the likelihood of oil being carried away from the compressor, facilitating communication with the oil sump, an oil return passage 152 is provided below the horizontal plane in which the horizontal central axis lies.

In the first embodiment according to the present invention, although the cover plate portion 136 and the main body portion 133 are constructed as separate members to facilitate the processing and assembly, it will be understood by those skilled in the art that the cover plate portion 136 and the main body portion 133 may also integrally form the non-orbiting scroll member.

In order to provide a given scroll member with some axial flexibility (i.e., to enable the non-orbiting scroll member to move a predetermined distance in the horizontal center axis direction) to increase reliability and safety of the compressor, the non-orbiting scroll member 130 is further provided with a back pressure chamber so that the non-orbiting scroll member 130 can be reliably engaged with the orbiting scroll member 120 by the pressure provided by the back pressure chamber.

Referring to fig. 1, the back pressure chambers of the non-orbiting scroll part 130, which include a first back pressure chamber C1, a second back pressure chamber C2, and a third back pressure chamber C3, are formed at a side opposite to the orbiting scroll blade 132 of the non-orbiting scroll part, in other words, at a side of the cover plate 136 opposite to the central discharge chamber 137, and are collectively configured by the cover plate 136, the partition plate 116, and a seal. Specifically, as shown in fig. 2 and 3, on the opposite side of the cover plate portion 136 from the central exhaust chamber 137 (shown as the upper side of the cover plate portion 136 in fig. 2), the cover plate portion 136 has a third flange portion 1363 that protrudes in the axial direction around the outer periphery of the cover plate portion 136, a first flange portion 1361 that protrudes in the axial direction around the exhaust port 138, and a second flange portion 1362 that protrudes in the axial direction around the opening of the first oil return passage section 1521. The third flange portion 1363 is sealingly engaged with the separation plate 116 by the third seal ring 160 to form a third back pressure chamber C3, the first flange portion 1361 is sealingly engaged with the separation plate 116 by the first seal ring 161 to form a first back pressure chamber C1, and the first flange portion 1362 is sealingly engaged with the separation plate 116 by the second seal ring 162 to form a second back pressure chamber C2. The first back pressure cavity C1 and the second back pressure cavity C2 are located in the third back pressure cavity C3, so that the arrangement of the back pressure cavities is more compact and easier to process and install. The third back pressure chamber C3 communicates with at least one compression chamber having an intermediate pressure among the series of compression chambers through a passage (not shown) provided in the non-orbiting scroll member, thereby providing an intermediate pressure to the third back pressure chamber C3. The first back pressure chamber C1 communicates with the high pressure side space through the first orifice 1161 of the partition plate 116, thereby supplying high pressure to the first back pressure chamber C1. The first back pressure chamber C1 is also communicated with the exhaust port 138, so that the compressed working fluid is discharged to the high pressure side space through the first back pressure chamber C1 after being discharged from the exhaust port 138. The second back pressure chamber C2 communicates with the high pressure side space through the second orifice 1162 of the partition plate 116, thereby supplying high pressure to the second back pressure chamber C2. The term "connected" herein means directly connected in space. The high pressure generated by the gas in the first back pressure cavity C1 and the second back pressure cavity C2 and the medium pressure generated by the gas in the third back pressure cavity C3 can resist the axial gas force in the compression cavity, so that the fixed scroll part is tightly pressed to the movable scroll part, and the axial sealing between the fixed scroll part and the movable scroll part is ensured.

As shown in fig. 4, in the first embodiment according to the present invention, since the exhaust port 138 of the non-orbiting scroll member 130 (i.e., the exhaust port 138 on the cover plate portion 136) is disposed above the horizontal plane on which the horizontal central axis is located, and the oil return passage 152 (including the first oil return passage section 1521) is disposed below the horizontal plane on which the horizontal central axis is located, the first back pressure chamber C1 corresponding to the position of the exhaust port 138 and the second back pressure chamber C2 corresponding to the position of the opening of the first oil return passage end 1521 are also located above and below the horizontal plane on which the horizontal central axis is located, respectively. Thus, the first and second back pressure chambers C1 and C2 can provide the non-orbiting scroll member 130 with high pressure forces F1 and F2 acting on upper and lower sides of the horizontal central axis, respectively, thereby more stably pressing the non-orbiting scroll member 130 against the orbiting scroll member 120.

It will be understood by those skilled in the art that the first back pressure chamber C1 and the second back pressure chamber C2 may be located above and below the horizontal plane on which the horizontal central axis is located, as shown in fig. 1 and 3, respectively, without intersecting the horizontal plane on which the horizontal central axis is located, or may be located at a position intersecting the horizontal plane on which the horizontal central axis is located, as long as the first back pressure chamber C1 is offset upward with respect to the horizontal plane on which the horizontal central axis is located, and the second back pressure chamber C2 is offset downward with respect to the horizontal plane on which the horizontal central axis is located. Even more, the first back pressure chamber C1 may be offset downward with respect to the horizontal plane on which the horizontal central axis is located, and the second back pressure chamber C2 may be offset upward with respect to the horizontal plane on which the horizontal central axis is located, as long as the first back pressure chamber C1 is at least partially located above the horizontal plane, and the exhaust port 138 communicates with the first back pressure chamber C1 through the portion of the first back pressure chamber C1 located above the horizontal plane. In addition, although the first back pressure chamber C1 and the second back pressure chamber C2 are shown as being circular in fig. 3, the first back pressure chamber C1 and the second back pressure chamber C2 may be implemented in other shapes. When the first back pressure chamber C1 and the second back pressure chamber C2 are implemented to be non-circular, "center" refers to a geometric center.

Since neither the high-pressure F1 generated by the first back-pressure chamber C1 nor the high-pressure F2 generated by the second back-pressure chamber C2 acts on the scroll center, a tilting moment may be generated on the non-orbiting scroll member 130. To ensure the stability of the non-orbiting scroll part 130, the center of the first back pressure chamber C1 and the center of the second back pressure chamber C2 are located at both sides of a horizontal plane on which the horizontal central axis is located, respectively, and the center of the first back pressure chamber C1 and the center of the second back pressure chamber C2 are located at both sides of or on a longitudinal plane perpendicular to the horizontal plane, respectively. Preferably, the first back pressure chamber C1 and the second back pressure chamber C2 are radially opposed with respect to the horizontal central axis to substantially achieve the moment balance generated by the first back pressure chamber C1 and the second back pressure chamber C2. Further, in order to completely cancel the moments generated by the first back pressure chamber C1 and the second back pressure chamber C2 to each other to achieve the balance of the non-orbiting scroll member 130, in a transverse section perpendicular to the horizontal central axis, the product of the cross-sectional area S1 of the first back pressure chamber C1 and the distance L1 from the center of the first back pressure chamber C1 to the horizontal central axis is equal to the product of the cross-sectional area S2 of the second back pressure chamber C2 and the distance L2 from the center of the second back pressure chamber C2 to the horizontal central axis, i.e., S1 × L1= S2 × L2.

The oil-air path in the horizontal scroll compressor 100 according to the first embodiment of the present invention is as follows: the working fluid in the low pressure side space enters the scroll assembly, is compressed through a series of compression chambers to a high pressure, exits the compression chambers from the central discharge port 135 of the non-orbiting scroll end plate 134, unseats the discharge valve 139 into the central discharge chamber 137, and then enters the high pressure side space through the discharge port 138 disposed above the horizontal center axis, the first back pressure chamber C1, and the first orifice 1161 in the partition plate 116. The working fluid introduced into the high pressure side space enters the oil distribution pipe 240 through the inlet 242 of the oil distribution pipe, oil-gas separation is performed in the oil distribution pipe 240, the working fluid after oil separation is discharged to the outside of the compressor, and the separated oil drops to the oil sump 150 at the bottom of the high pressure side space through the oil return hole 144 at the bottom of the oil distribution pipe 140. The oil in the oil sump 150 is returned to the low-pressure side space through the second orifice 1162 on the partition plate 116, the second back pressure chamber C2, and the oil return passage 152 in the non-orbiting scroll member, all of which are located below the horizontal center axis.

The advantages of the first embodiment of the present invention will be described below with reference to a comparative example shown in fig. 7. In the comparative example, the horizontal scroll compressor 1 includes a housing 10, an orbiting scroll member 20, a non-orbiting scroll member 30, and the like, and the structure and operation principle thereof are substantially the same as those of the present invention, and thus, detailed description thereof is omitted. In contrast, the exhaust port 38 of the fixed scroll member 30 is provided at the center of the cover plate 36, and the high-pressure back pressure chamber C0 and the intermediate-pressure back pressure chamber C are provided on the opposite side of the cover plate 36 from the main body 33. The high-pressure back pressure chamber C0 is provided in the center of the cover plate portion 36 around the exhaust port 38, and communicates with the high-pressure side space through an orifice 161 located at the center of the partition plate 16. An intermediate pressure back pressure chamber C is disposed at the periphery of the first back pressure chamber C0 and communicates with at least one compression chamber of the series of compression chambers having an intermediate pressure through a passage (not shown) provided in the non-orbiting scroll member 30. Further, the oil sump 50 at the bottom of the high-pressure side space is returned to the low-pressure side space through an oil return passage 52 formed in the partition plate 16 and the casing 10. In the comparative example, since the discharge port 38 and the corresponding high pressure back pressure chamber C0, the orifice 161 on the partition plate 16 are all provided at the horizontal central axis (i.e., the center of the discharge port 38, the high pressure back pressure chamber C0, and the center of the orifice 161 are on the horizontal central axis), the distance from the oil pool 50 at the bottom of the high pressure side space is small, so that oil is easily taken away from the compressor by the working fluid.

In the horizontal scroll compressor 100 of the present invention, the exhaust port 138 and the corresponding first back pressure chamber C1 and the first hole 1161 of the partition plate 116 are disposed above the horizontal central axis, so that the distance from the oil sump 150 at the bottom of the high pressure side space is increased, and the oil is prevented from being carried away from the compressor by the working fluid.

On the other hand, in order to avoid the fixed scroll part 130 from overturning due to the acting force of the first back pressure chamber C1 arranged above the horizontal central axis to the fixed scroll part 130, the horizontal scroll compressor 100 of the present invention is further provided with the second back pressure chamber C2 located below the horizontal central axis, so that the moment generated by the second back pressure chamber C2 to the fixed scroll part 130 and the moment generated by the first back pressure chamber C1 to the fixed scroll part 130 are mutually offset, and the fixed scroll part 130 can be ensured to be more stably and reliably engaged with the movable scroll part 120. Meanwhile, the second back pressure chamber C2 communicates the oil return passage 152 in the non-orbiting scroll and the second orifice 1162 on the partition plate 116, so that the oil of the oil sump 150 can be returned to the low pressure side space via the second orifice 1162 on the partition plate 116, the second back pressure chamber C2, and the oil return passage 152. Therefore, only one second hole 1162 is formed in the partition plate 116 to simultaneously provide high pressure to the second back pressure chamber C2 and provide an oil return path, and a plurality of holes need not be formed in the partition plate, so that the compressor is simpler in structure and more convenient to machine.

It will be understood by those skilled in the art that although the second back pressure chamber C2 is provided in the oil return path in the first embodiment of the present invention, the present invention is not limited thereto. Fig. 5 to 6 show a second embodiment according to the present invention, in which the second back pressure chamber C2 is provided independently of the oil return path.

As shown in fig. 5, in the second embodiment according to the present invention, the horizontal scroll compressor 200 includes a housing 210, an orbiting scroll part 220, a non-orbiting scroll part 230, and the like, and the structure and operation principle thereof are substantially the same as those of the first embodiment of the present invention, and thus, detailed description thereof is omitted. In contrast, a through hole for communicating the oil sump 250 of the high pressure side space with the low pressure side space is separately provided in the partition plate 216 in addition to the first orifice 2161 communicating with the first back pressure chamber C1 and the second orifice 2162 communicating with the second back pressure chamber C2. Fig. 6 shows an enlarged view of the region a in fig. 5 where the through-hole is located. The through hole passes through the partition plate 216 in the axial direction, is disposed below the horizontal center axis, and is disposed outside the cover plate portion 236 of the non-orbiting scroll member, thereby forming an oil return passage 252 that directly communicates the oil sump 250 with the low-pressure side space. And an oil return passage is no longer provided in the non-orbiting scroll member, and the second back pressure chamber C2 is no longer communicated with the oil return passage.

The oil-air path in the horizontal scroll compressor 200 according to the second embodiment of the present invention is as follows: the working fluid in the low pressure side space enters the scroll assembly, is compressed through a series of compression chambers to a high pressure, exits the compression chambers through the central discharge port 235 of the non-orbiting scroll end plate 234, unseats the discharge valve 239 into the central discharge plenum 237, and then enters the high pressure side space through the discharge port 238 disposed above the horizontal center axis, the first back pressure chamber C1, and the first aperture 2161 in the divider plate 216. The working fluid introduced into the high pressure side space enters the oil distribution pipe 240 through the air inlet 242 of the oil distribution pipe, oil-gas separation is performed in the oil distribution pipe 240, the working fluid after oil separation is discharged to the outside of the compressor, and the separated oil drops to the oil sump 250 at the bottom of the high pressure side space through the oil return hole 244 at the bottom of the oil distribution pipe 240. The oil in the oil sump 250 is returned to the low-pressure side space through an oil return passage 252 provided in the partition plate 216 below the horizontal center axis.

Therefore, according to the second embodiment of the present invention, in addition to the advantage of avoiding high-pressure discharge air from taking oil of the oil sump away from the compressor, which is obtained because the discharge port 238 is eccentrically disposed above the horizontal central axis, machining and assembly of the non-orbiting scroll part 230 are simpler and less costly, since an oil return passage does not need to be provided in the non-orbiting scroll part 230.

In addition, it will be understood by those skilled in the art that the present invention is not limited to the above-described two embodiments, but also includes variations or combinations of the above-described two embodiments. For example, the first back pressure chamber C1 and the second back pressure chamber C2 may not be provided in the third back pressure chamber C3, and only the first, second, and third back pressure chambers need to be sealed from each other. For another example, the number of the second back pressure chambers C2 may be one, two or more, and preferably, the number of the second back pressure chambers C2 is two, wherein one second back pressure chamber C2 is communicated with the oil return passage provided in the fixed scroll part, and a connecting line between centers of the two second back pressure chambers C2 and a center of the first back pressure chamber C1 forms an isosceles triangle, so that the force applied to the fixed scroll part is sufficiently balanced, and the fixed scroll part is more stably and reliably engaged with the movable scroll part.

The high temperature heat pump system according to the preferred embodiment of the present invention has been described above with reference to the specific embodiments. It will be understood that the above description is intended to be illustrative and not restrictive, and that various changes and modifications may be suggested to one skilled in the art in view of the above description without departing from the scope of the invention. Such variations and modifications are also included in the scope of the present invention.

Claims (12)

1. A horizontal scroll compressor (100, 200) comprising:

a housing (110, 210) defining an interior space of the horizontal scroll compressor;

a partition plate (116, 216) that divides the interior space into a high-pressure side space and a low-pressure side space; and

a scroll assembly including an orbiting scroll member (120, 220) and a non-orbiting scroll member (130, 230) with a series of compression chambers formed therebetween, the non-orbiting scroll member including a discharge port (138, 238) for discharging compressed working fluid from the scroll assembly to the high pressure side space,

wherein the non-orbiting scroll member is configured to be movable relative to the housing by a predetermined distance in a direction of a horizontal central axis of the horizontal type scroll compressor,

wherein a first back pressure chamber (C1) and a second back pressure chamber (C2) which are hermetically separated from each other and used for pushing the fixed scroll part towards the movable scroll part are arranged between the fixed scroll part and the partition plate, the first back pressure chamber is positioned to be offset towards one side of a horizontal plane where the horizontal central axis is positioned, the second back pressure chamber is positioned to be offset towards the other side of the horizontal plane, the first back pressure chamber is at least partially positioned above the horizontal plane, the first back pressure chamber and the second back pressure chamber are both communicated with the high pressure side space, and the first back pressure chamber is also communicated with the exhaust port.

2. The horizontal scroll compressor (100, 200) according to claim 1, wherein:

the first back pressure cavity and the second back pressure cavity are positioned radially opposite with respect to the horizontal central axis.

3. The horizontal scroll compressor (100, 200) according to claim 1, wherein: in a transverse cross-section perpendicular to the horizontal central axis, the product of the cross-sectional area of the first back pressure chamber and the distance from the center of the first back pressure chamber to the horizontal central axis is equal to the product of the cross-sectional area of the second back pressure chamber and the distance from the center of the second back pressure chamber to the horizontal central axis.

4. The horizontal scroll compressor (100, 200) according to claim 1, wherein the second back pressure chambers are two, and a line connecting a center of the first back pressure chamber and centers of the two second back pressure chambers forms an isosceles triangle in a transverse cross section perpendicular to the horizontal central axis.

5. The horizontal scroll compressor (100) according to claim 1, wherein an oil sump (150) containing oil is provided in a region of the high pressure side space below the horizontal plane, and a first orifice (1161) communicating with the first back pressure chamber and a second orifice (1162) communicating with the second back pressure chamber are formed in the partition plate (116, 216).

6. The horizontal scroll compressor (100) according to claim 5, wherein an oil return passage (152) communicating with the second back pressure chamber is provided in the non-orbiting scroll member, and oil in the oil sump (150) is returned to the low pressure side space via the second orifice (1162), the second back pressure chamber, and the oil return passage.

7. The horizontal scroll compressor (200) according to claim 5, wherein an oil return passage (252) directly communicating with the low-pressure side space is further formed in the partition plate (216), and the oil in the oil sump (250) is returned to the low-pressure side space via the oil return passage (252).

8. The horizontal scroll compressor (100, 200) according to claim 6 or 7, wherein the ratio of the inner diameter of the oil return passage (152, 252) to its length is less than or equal to 1.

9. The horizontal scroll compressor (100, 200) according to any one of claims 1 to 7, wherein a third back pressure chamber (C3) sealingly separated from each of the first back pressure chamber (C1) and the second back pressure chamber (C2) for urging the non-orbiting scroll member toward the orbiting scroll member is further provided between the non-orbiting scroll member and the partition plate, the third back pressure chamber (C3) communicating with a compression chamber having an intermediate pressure among the compression chambers, the first back pressure chamber (C1) and the second back pressure chamber (C2) being provided within the third back pressure chamber (C3).

10. The horizontal scroll compressor (100, 200) according to any one of claims 1 to 7, wherein said non-orbiting scroll member includes a split body portion (133) and a cover plate portion (136), said exhaust port (138) being formed at a position of said cover plate portion which is above said horizontal plane.

11. The horizontal scroll compressor (100, 200) according to any one of claims 1 to 7, wherein an oil distribution pipe (140, 240) having an air inlet hole (142, 242) located above the horizontal plane and an oil return hole (144, 244) located at a bottom of the oil distribution pipe is provided in the high pressure side space.

12. The horizontal scroll compressor (100, 200) according to any one of claims 1 to 7, wherein the first and second back pressure chambers are located above and below the horizontal plane, respectively.

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