CN117365954A - Non-orbiting scroll assembly, scroll compressor and method of machining non-orbiting scroll assembly - Google Patents

Abstract

The present disclosure relates to a non-orbiting scroll assembly, a scroll compressor, and a method of processing a non-orbiting scroll assembly. The non-orbiting scroll assembly includes a non-orbiting scroll member and a seal assembly. The fixed scroll member is provided with an end plate and a fixed wrap extending from one side of the end plate. The non-orbiting scroll member is provided with at least one set of apertures, each set of apertures including a bypass aperture and an enhanced vapor injection aperture. Fluid within the compression pockets can be discharged to a low pressure region external to the non-orbiting scroll member via the bypass aperture. An enthalpy-increasing injection fluid external to the compressor including the non-orbiting scroll assembly can be supplied into the compression chamber via the enthalpy-increasing injection hole. The seal assembly is configured to seal a set of holes in the at least one set of holes. The variable displacement structure and the jet enthalpy increasing structure in the fixed scroll component of the scroll compressor are integrally designed, so that the structure and the processing process of the scroll compressor are simplified, and the number of required sealing parts is reduced.

Description

Non-orbiting scroll assembly, scroll compressor and method of machining non-orbiting scroll assembly

Technical Field

The present disclosure relates to the field of compressors, and in particular to a non-orbiting scroll assembly, a scroll compressor including the same, and a method of machining the same.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Bypass holes at the intermediate pressure compression chamber are often provided in some scroll compressors for selectively flowing or disconnecting the intermediate pressure compression chamber from the low pressure side fluid to vary the displacement of the scroll compressor without varying the rotational speed of the scroll compressor. In other scroll compressors, particularly in large-number scroll compressors, an enthalpy injection technology is often adopted, that is, refrigerant is supplemented to a designated position of a compression cavity through an enthalpy injection hole of the enthalpy injection in fluid communication with the compression cavity of the compressor, so that an enthalpy injection effect is achieved, and the performance of the compressor is improved. Conventional high-capacity scroll compressors typically do not include both a variable displacement configuration and an enhanced vapor injection configuration.

If the variable displacement structure and the enhanced vapor injection structure are simply integrated into one large scroll compressor, the number of parts, the processing difficulty and the volume thereof are increased, thereby resulting in time consuming assembly, an increase in the overall volume and the cost.

Disclosure of Invention

It is an object of the present disclosure to integrate a variable displacement structure with an enhanced vapor injection structure in a scroll compressor, which can simplify the structure and process of the scroll compressor.

Another object of the present disclosure is to seal a variable displacement bypass orifice and an injection enthalpy increasing injection orifice in a scroll compressor with a common sealing structure, thereby reducing the number of required sealing parts.

One aspect of the present disclosure provides a non-orbiting scroll assembly including a non-orbiting scroll member and a seal assembly. The fixed scroll member is provided with an end plate and a fixed wrap extending from one side of the end plate. The non-orbiting scroll member is provided with at least one set of apertures, each set of apertures including a bypass aperture and an enhanced vapor injection aperture. Fluid within the compression pockets can be discharged to a low pressure region external to the non-orbiting scroll member via the bypass aperture. An enthalpy-increasing injection fluid external to the compressor including the non-orbiting scroll assembly can be supplied into the compression chamber via the enthalpy-increasing injection hole. The seal assembly is configured to seal a set of holes in the at least one set of holes.

In one embodiment, the non-orbiting scroll member may include two or more sets of apertures spaced apart in a circumferential direction.

In one embodiment, the seal assembly may include a piston. The piston is disposed in the bypass bore and is movable between a first position allowing the respective compression chamber to be in fluid communication with the low pressure region and a second position preventing the respective compression chamber from being in fluid communication with the low pressure region.

In one embodiment, the non-orbiting scroll assembly may further include a fluid control device. The fluid control device is configured to control a pressure difference between an upper side and a lower side of the piston by introducing a fluid having a predetermined pressure to the upper side of the piston to control movement of the piston.

In one embodiment, the non-orbiting scroll member may further include a fluid passage communicating the bypass hole to a high pressure region having a pressure of fluid greater than a pressure of fluid in a compression chamber communicating with the bypass hole. The fluid control device may include a valve configured to selectively connect or disconnect the fluid passage to vary a pressure differential above and below the piston.

In one embodiment, a communication groove may be provided at an upper surface of the non-orbiting scroll member to communicate all of the bypass holes or the bypass holes in each group of holes with each other and with at least one of the fluid passages. The communication groove may be sealed by a sealing assembly.

In one embodiment, the fluid channels may include a first fluid channel and a second fluid channel. The first fluid passage extends from the outer peripheral surface of the non-orbiting scroll member to the high pressure region, and the second fluid passage extends from the outer peripheral surface of the non-orbiting scroll member to the communication groove. The valve is located between the first fluid passage and the second fluid passage.

In one embodiment, the bypass holes and the injection enthalpy increasing injection holes may extend from an upper surface of the end plate to the corresponding compression chambers.

In one embodiment, the fluid control device may be disposed on an outer peripheral surface of the end plate.

In one embodiment, the upper surface of the end plate may be provided with a recess, and the side wall of the recess may be provided with a vent groove. The vent slots are configured to enable all bypass holes or bypass holes in each set of holes to communicate with each other and with the low pressure region via the vent slots.

In one embodiment, the fixed scroll may include a hub protruding from an upper surface of the end plate in an axial direction, and the bypass hole and the injection enthalpy increasing injection hole may extend from an upper surface of the hub to the corresponding compression chamber.

In one embodiment, the fluid control device may be disposed on an outer peripheral surface of the hub.

In one embodiment, the outer circumferential surface of the hub portion may be provided with a vent groove. The vent slots are configured to enable all bypass holes or bypass holes in each set of holes to communicate with each other and with the low pressure region via the vent slots.

In one embodiment, the non-orbiting scroll member may further include an enhanced vapor injection inlet aperture and an enhanced vapor injection passage. The jet enthalpy increasing inlet hole is positioned at the peripheral surface of the end plate, and the jet enthalpy increasing channel extends inside the end plate and connects the jet enthalpy increasing inlet hole and the jet enthalpy increasing jet hole.

In one embodiment, the injection hole may include a recess formed in the fixed scroll.

In one embodiment, the seal assembly may include a gasket seal and a platen that cover and seal the bypass orifice and the jet enthalpy injection orifice.

In one embodiment, the seal assembly may further include a fastener that secures the seal gasket and the pressure plate to the non-orbiting scroll member.

Another aspect of the present disclosure provides a scroll compressor including the non-orbiting scroll assembly according to the above aspects.

Yet another aspect of the present disclosure provides a method of machining a non-orbiting scroll assembly. The non-orbiting scroll assembly may include a non-orbiting scroll member having a non-orbiting scroll and an end plate. The method comprises the following steps: at least one set of holes is machined in the non-orbiting scroll member, each set of holes in the at least one set of holes including a bypass hole and an injection enthalpy increasing injection hole. Fluid within the compression pockets can be discharged to a low pressure region external to the non-orbiting scroll member via the bypass aperture. An external enhanced vapor injection fluid of a compressor including a non-orbiting scroll assembly can be supplied into the compression chamber via an enhanced vapor injection orifice; and machining a seal assembly for sealing the set of holes in the at least one set of holes.

In one embodiment, machining the at least one set of holes may include: bypass holes and jet enthalpy increasing jet holes are processed from the upper surface of the end plate toward the corresponding compression chambers.

In one embodiment, the method may further comprise: a communication groove is formed in an upper surface of the end plate so that each set of bypass holes or all the bypass holes communicate with each other and can communicate with a high-pressure region in which a pressure of fluid is greater than a pressure of fluid in a compression chamber communicating with the bypass holes.

In one embodiment, the method may further comprise: a recess is provided on the upper surface of the end plate, and a vent groove for communicating each set of bypass holes with the low pressure region is provided on a side wall of the recess.

In one embodiment, the non-orbiting scroll member includes a hub projecting in an axial direction from an upper surface of the end plate, and machining the at least one set of holes includes: bypass holes and injection enthalpy increasing injection holes are machined from the upper surface of the hub toward the corresponding compression chambers.

In one embodiment, the method may further comprise: a communication groove is formed in an upper surface of the hub portion so that each set of bypass holes or all the bypass holes communicate with each other and can communicate with a high pressure region in which a pressure of fluid is greater than a pressure of fluid in a compression chamber communicating with the bypass holes.

In one embodiment, the method may further comprise: an exhaust groove is formed on the outer circumferential surface of the hub portion so that each set of bypass holes or all the bypass holes communicate with each other and with the low pressure region.

Further areas of applicability of the present disclosure will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the disclosure, are intended for purposes of illustration only and are not intended to limit the disclosure.

Drawings

Embodiments of the present disclosure will be described below, by way of example only, with reference to the accompanying drawings. In the drawings, like features or components are denoted by like reference numerals. The figures are not necessarily to scale, for example, certain features may be shown exaggerated in scale for clarity. In the drawings:

FIG. 1 illustrates a perspective view of a compression mechanism of a scroll compressor according to one embodiment of the present disclosure;

FIG. 2 illustrates an exploded view of the non-orbiting scroll assembly of FIG. 1;

figures 3-5 illustrate front, top and bottom views, respectively, of the non-orbiting scroll member of figure 1;

FIG. 6 illustrates a cross-sectional view of the compression mechanism of FIG. 1 taken along line A-A of FIG. 3;

FIG. 7 illustrates a cross-sectional view of the compression mechanism of FIG. 1 taken along line B-B of FIG. 6;

FIG. 8 illustrates a rear view of the non-orbiting scroll member of FIG. 1;

FIG. 9 illustrates a cross-sectional view of the non-orbiting scroll member of FIG. 1 taken along line C-C of FIG. 8;

FIG. 10 illustrates a cross-sectional view of the non-orbiting scroll member of FIG. 1 taken along line D-D of FIG. 9;

FIG. 11 illustrates a cross-sectional view of the non-orbiting scroll member of FIG. 1 taken along line E-E of FIG. 9;

FIG. 12 illustrates a cross-sectional view of the compression mechanism of FIG. 1 taken along line F-F in FIG. 9;

FIG. 13 illustrates a perspective view of a compression mechanism of a scroll compressor according to another embodiment of the present disclosure;

FIG. 14 illustrates an exploded view of the non-orbiting scroll assembly of FIG. 13;

FIG. 15 illustrates a side view of the non-orbiting scroll member of FIG. 13;

FIG. 16 illustrates a cross-sectional view of the non-orbiting scroll member taken in a vertical plane passing through the axis of the first fluid passage illustrated in FIG. 15;

FIG. 17 illustrates a cross-sectional view of the non-orbiting scroll member taken along a vertical plane passing through the axis of the second fluid passage illustrated in FIG. 15.

Detailed Description

Exemplary embodiments will now be described more fully with reference to the accompanying drawings.

The exemplary embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those skilled in the art. Numerous specific details are set forth, such as examples of specific components, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to one skilled in the art that the exemplary embodiments may be embodied in many different forms without the use of specific details, and should not be construed as limiting the scope of the disclosure. In some exemplary embodiments, well-known processes, well-known device structures, and well-known techniques are not described in detail.

In the following description, directional terms used in relation to "upper" and "lower" are described in terms of upper and lower positions of the views shown in the drawings. In practical use, the positional relationships of "upper" and "lower" used herein may be defined according to practical circumstances, and these relationships may be reversed.

A scroll compressor according to an embodiment of the present disclosure will be described first with reference to fig. 1 to 12. The scroll compressor may include a housing, a compression mechanism 1 accommodated in the housing, a driving mechanism for driving the compression mechanism, and the like. For simplicity, only the compression mechanism 1 of the scroll compressor is shown herein, and other well-known structures of the scroll compressor are not shown.

Fig. 1 shows a perspective view of a compression mechanism 1 of a scroll compressor according to one embodiment of the present disclosure. The compression mechanism 1 of the scroll compressor includes an orbiting scroll member 10 and a non-orbiting scroll member 20 that cooperate with each other to form a compression chamber. Fig. 2 shows an exploded view of the non-orbiting scroll assembly of fig. 1 including non-orbiting scroll member 20. As shown in fig. 2, the non-orbiting scroll assembly may include a non-orbiting scroll member 20 and a seal assembly 40 coupled to the non-orbiting scroll member 20. Fig. 3 to 5 show front, top and bottom views, respectively, of the non-orbiting scroll member 20; fig. 6 and 7 show a sectional view of the compression mechanism 1 of the scroll compressor.

As shown in fig. 1 to 5, the fixed scroll member 20 includes an end plate 21 and a fixed wrap 22 extending in the axial direction from a lower surface 21b of the end plate 21. The non-orbiting scroll member 20 may further include a hub 23 protruding in an axial direction from the upper surface 21a of the end plate 21. As shown in fig. 7, the orbiting scroll member 10 includes an end plate 11 and an orbiting wrap 12 extending in the axial direction from an upper surface 11a of the end plate 11. When the scroll compressor is in operation, the drive mechanism drives orbiting scroll member 10 relative to non-orbiting scroll member 20, and orbiting scroll 12 intermeshes with non-orbiting scroll 22 to form a series of compression pockets therebetween which progressively decrease in volume from radially outboard toward radially inboard. As shown in FIG. 5, fixed scroll 22 defines a spiral fluid compression path. In the fully loaded operation state of the scroll compressor, the fluid to be compressed flows in from the radially outer side of the spiral fluid compression path, and after being compressed, flows out from the discharge port 21c located at the substantially center of the end plate 21. At the middle of the spiral fluid compression path, one or more bypass holes 24 extending from the upper surface 21a of the end plate 21 through the end plate 21 down to the compression chamber are provided. In the present embodiment, two sets of bypass holes spaced apart in the circumferential direction are provided, each set of bypass holes including three bypass holes 24. In other embodiments, any number and set of bypass holes may be provided. Furthermore, the shape of the bypass aperture may be circular or take on any other suitable shape. By selectively fluidly connecting or disconnecting the bypass aperture 24 to the exterior of the non-orbiting scroll member 20, the displacement of the scroll compressor may be varied. When the bypass hole 24 is blocked, the scroll compressor is operated in a full load operation state; the scroll compressor operates in a part load operating condition when the bypass aperture 24 is in fluid communication with the exterior of the non-orbiting scroll member 20 thereby placing the corresponding compression chamber in fluid communication with the low pressure region of the scroll compressor. As shown in fig. 1 and 2, a discharge groove 25 is provided at a side of each set of bypass holes 24, and the discharge groove 25 extends into each bypass hole of the set of bypass holes 24, so that the respective bypass holes of the set of bypass holes 24 can communicate with each other and the outside of the non-orbiting scroll member 20 via the discharge groove 25. As shown in fig. 2, in the present embodiment, the exhaust groove 25 is provided on a side wall 21e of the recess 21d recessed downward from the upper surface 21a of the end plate 21 adjacent to the bypass hole 24.

Fig. 6 shows a sectional view of the compression mechanism 1 of the scroll compressor taken along the line A-A in fig. 3, and fig. 7 shows a sectional view of the compression mechanism 1 of the scroll compressor taken along the line B-B in fig. 6. As shown in fig. 3 to 7, the non-orbiting scroll member 20 may further include an injection enthalpy increasing inlet hole 26 formed at an outer circumferential surface 21f of the end plate 21, an injection enthalpy increasing injection hole 27 extending from an upper surface 21a of the end plate 21 through the end plate 21 downward to the compression chamber, and an injection enthalpy increasing passage 28 extending inside the end plate 21 and connecting the injection enthalpy increasing inlet hole 26 and the injection enthalpy increasing injection hole 27. In the present embodiment, the non-orbiting scroll member 20 includes two injection enthalpy increasing injection holes 27, each injection enthalpy increasing injection hole 27 being positioned adjacent to a set of bypass holes 24. In other embodiments, any number of jet enthalpy increasing injection holes may be provided. As shown in fig. 7, when the scroll compressor is operated, the opening 27a of the injection enthalpy increasing injection hole 27 at the upper surface 21a of the end plate 21 is sealed, and the opening 27b of the injection enthalpy increasing injection hole 27 at the lower surface 21b of the end plate 21 is in fluid communication with the compression chamber. Thus, a certain amount of refrigerant can be supplemented to a designated position (i.e., a designated compression chamber) via the enthalpy-increasing injection hole 26, the enthalpy-increasing injection passage 28, and the enthalpy-increasing injection hole 27, thereby achieving an enthalpy-increasing effect and optimizing the performance of the scroll compressor.

Preferably, as shown in fig. 7, at least a portion of the injection-enthalpy-increasing injection holes 27 extend from the upper surface 21a of the end plate 21 beyond the lower surface 21b and into the fixed scroll 22, such that the injection-enthalpy-increasing injection holes 27 include a recess 27c formed by removing a portion of material from the fixed scroll 22. In the prior art, the jet enthalpy increasing injection hole is usually drilled from the lower surface 21b of the end plate 21, which requires that the jet enthalpy increasing injection hole must avoid the fixed scroll 22 and cannot exceed the line width of the moving scroll 12 to prevent the fluid in the compression chamber in fluid communication with the jet enthalpy increasing injection hole from leaking to the adjacent other compression chamber. Therefore, the aperture and the flow area of the jet enthalpy increasing jet hole in the prior art are limited. In contrast, the injection-enthalpy-increasing injection holes 27 are drilled from the upper surface 21a of the end plate 21 according to the embodiment of the present disclosure, and the injection-enthalpy-increasing injection holes 27 may be arranged using a portion of the thickness of the fixed scroll 22, which can significantly increase the aperture and flow area of the injection-enthalpy-increasing injection holes 27.

In the present disclosure, the bypass holes 24 for implementing the compressor variable displacement function and the enthalpy injection holes 27 for implementing the enthalpy injection function are arranged adjacent to each other and in groups, so that proper sealing of the holes can be implemented by a common sealing structure. As shown in fig. 1 and 2, the non-orbiting scroll assembly of the scroll compressor may include a seal assembly 40. The sealing assembly 40 may include a pressure plate 41 and a sealing gasket 42 for covering and sealing the bypass hole 24 and the injection enthalpy increasing injection hole 27, wherein the sealing gasket 42 is positioned between the pressure plate 41 and the bypass hole 24 and the injection enthalpy increasing injection hole 27. The seal assembly 40 may further include a plurality of bolts 43, the bolts 43 passing through corresponding bolt holes formed in the seal gasket 42, the pressure plate 41, and the upper surface 21a of the end plate 21 to fix and compress the seal gasket 42 and the pressure plate 41 to the upper surface 21a of the end plate 21. Any other suitable fastener may be used in addition to the bolts 43. In the present embodiment, two pressure plates 41 and two sealing gaskets 42 are provided corresponding to the two sets of bypass holes 24 and the injection enthalpy increasing injection holes 27 spaced apart from each other. The seal assembly 40 may also include a piston 44. A piston 44 is disposed in the bypass bore 24 and is movable up and down to selectively fluidly connect and disconnect the compression chamber from the low pressure region.

The seal assembly 40 is used to seal groups of orifices, including bypass orifices and jet enthalpy injection orifices adjacent to each other. That is, a single seal assembly may be used to seal one set of holes, more than one set of holes, or all sets of holes. The number of sealing assemblies can be significantly reduced, the sealing structure can be simplified and compact, and assembly time can be reduced.

As shown in fig. 1 and 2, the non-orbiting scroll assembly of the scroll compressor may further include a fluid control device 50 for introducing fluid having a predetermined pressure to an upper surface of the piston 44, and controlling the movement of the piston 44 by controlling a pressure difference between above and below the piston 44, thereby controlling the scroll compressor to be switched between a full load operation state and a partial load operation state. In the present embodiment, the fluid control device 50 includes a solenoid valve. In other embodiments, fluid control device 50 may also include any other suitable valve and/or other mechanism.

The operation and principles of the seal assembly 40 and the fluid control device 50 are described below in connection with fig. 8-12. FIG. 8 illustrates a rear view of non-orbiting scroll member 20; FIG. 9 illustrates a cross-sectional view of non-orbiting scroll member 20 taken along line C-C in FIG. 8; FIG. 10 illustrates a cross-sectional view of non-orbiting scroll member 20 taken along line D-D in FIG. 9; FIG. 11 illustrates a cross-sectional view of non-orbiting scroll member 20 taken along line E-E in FIG. 9; fig. 12 shows a sectional view of the compression mechanism 1 of the scroll compressor taken along the line F-F in fig. 9.

As shown in fig. 8 and 9, the end plate 21 of the fixed scroll member 20 is provided with a first fluid passage 31, a second fluid passage 32, and a third fluid passage 33 extending from the outer peripheral surface 21f of the end plate 21 to the inside of the end plate 21. As shown in fig. 9 and 10, the first fluid passage 31 may include a laterally extending section 31a and a pressure relief hole 31b extending to the lower surface 21b of the end plate 21 at an inner end of the laterally extending section 31a, the pressure relief hole 31b of the first fluid passage 31 being in fluid communication with the high pressure region. The pressure relief hole 31b may be positioned radially inward of the bypass holes 24 on the spiral fluid compression path of the non-orbiting scroll member 20, that is, the pressure relief hole 31b may be closer to the center of the non-orbiting scroll member 20 than each of the bypass holes 24. As shown in fig. 9, the second fluid passage 32 and the third fluid passage 33 correspond to the set of bypass holes 24, respectively. Referring to fig. 4 and 11, the second fluid passage 32 may include a lateral extension 32a and a communication hole 32b extending to the upper surface 21a of the end plate 21 at an inner end of the lateral extension 32a, and a communication groove 36 communicating the set of bypass holes 24 with each other and with the communication hole 32b is further provided on the upper surface 21a of the end plate 21. Similarly, as shown in fig. 4 and 9, the third fluid passage 33 may include a laterally extending section 33a and a communication hole 33b extending to the upper surface 21a of the end plate 21 at an inner end of the laterally extending section 33a, and a communication groove 38 that communicates the set of bypass holes 24 with each other and with the communication hole 33b is further provided on the upper surface 21a of the end plate 21. As shown in fig. 11, the upper portion of each bypass hole 24 has a slightly larger aperture than the lower portion, and the upper portion of the bypass hole 24 defines a piston chamber 24a for receiving the piston 44, and the piston 44 is movable up and down within the piston chamber 24a and is capable of blocking the lower portion of the bypass hole 24. In the assembled state, the communication holes 32b, 33b and the communication grooves 36, 38 are covered and sealed by the pressure plate 41 and the sealing gasket 42, and the fluid from the second fluid passage 32 and the third fluid passage 33 can flow into the corresponding piston chamber 24a through the communication grooves 36, 38 and act on the upper surface of the piston 44, respectively.

As shown in fig. 1 and 2, the fluid control device 50 is disposed on the outer peripheral surface 21f of the end plate 21 of the non-orbiting scroll member 20 and between the first fluid passage 31 and the second and third fluid passages 32, 33. In the present embodiment, a recess 21g for receiving the fluid control device 50 is formed on the outer peripheral surface 21f of the end plate 21. The fluid control device 50 is configured to selectively fluidly connect or disconnect the first fluid passage 31 with the second fluid passage 32 and the third fluid passage 33, thereby changing the pressure difference above and below the piston 44, and controlling the piston 44 to move up and down using the pressure difference. Piston 44 is movable between a first position allowing fluid communication of the respective compression pockets with a low pressure region external to non-orbiting scroll member 20 and a second position preventing fluid communication of the respective compression pockets with the low pressure region. Fig. 12 schematically shows both the first position of the piston 44 (see left-hand piston 44 in fig. 12) and the second position of the piston 44 (see right-hand piston 44 in fig. 12).

In the embodiment in which the fluid control device 50 is a solenoid valve, when the solenoid valve is de-energized, the solenoid valve places the first fluid passage 31 in fluid communication with the second fluid passage 32 and the third fluid passage 33, high-pressure fluid from a high-pressure region corresponding to the pressure taking hole 31b flows into the piston chamber 24a of each of the bypass holes 24 of the corresponding set of bypass holes 24 via the first fluid passage 31, the second fluid passage 32 and the communication groove 36, and simultaneously, high-pressure fluid from a high-pressure region corresponding to the pressure taking hole 31b flows into the piston chamber 24a of each of the bypass holes 24 of the corresponding other set of bypass holes 24 via the first fluid passage 31, the third fluid passage 33 and the communication groove 38. Thus, the pressure above each piston 44 corresponds to the pressure of the fluid at the pressure pickup hole 31b, and the pressure below each piston 44 corresponds to the pressure of the fluid in the compression chamber in fluid communication with the respective bypass hole 24. Since the pressure taking hole 31b is closer to the center of the non-orbiting scroll member 20 than each of the bypass holes 24 is on the spiral fluid compression path, the pressure of the fluid at the high pressure region corresponding to the pressure taking hole 31b is greater than the pressure of the fluid in the compression chamber in fluid communication with each of the bypass holes 24, i.e., the pressure above the piston 44 is greater than the pressure below the piston 44. Thus, the piston 44 is forced down to its second position by the high pressure fluid thereabove, thereby blocking the bypass orifice 24 and the vent 25, as shown in the right half of fig. 12.

When the solenoid valve is energized, the solenoid valve disconnects the first fluid passage 31 from the second fluid passage 32 and the third fluid passage 33. At this time, the high-pressure fluid located above the piston 44 in the piston chamber 24a of each bypass hole 24 is discharged via the fluid path in the solenoid valve, so that the pressure below the piston 44 is greater than the pressure above the piston 44. Thus, the piston 44 moves upward to its first position, placing the bypass orifice 24 in fluid communication with the discharge groove 25, and fluid in the respective compression chambers can flow out through the bypass orifice 24 and the discharge groove 25, as indicated by the arrows in the left half of fig. 12.

Fig. 13 to 17 show a compression mechanism 1' of a scroll compressor according to another embodiment of the present disclosure. The following will mainly be described with respect to the differences of the compression mechanism 1' from the compression mechanism 1 described above, wherein identical or corresponding features or parts are indicated with the same reference numerals with an apostrophe.

Fig. 13 shows a perspective view of a compression mechanism 1' of a scroll compressor. The compression mechanism 1' includes an orbiting scroll member 10' and a non-orbiting scroll member 20' that cooperate with each other to form a compression chamber. Fig. 14 shows an exploded view of the non-orbiting scroll assembly of fig. 13, which may include a non-orbiting scroll member 20', a seal assembly 40' coupled to the non-orbiting scroll member 20', and a fluid control device 50'. As shown in fig. 14, in this embodiment, the non-orbiting scroll member 20' includes two sets of bypass holes 24' spaced apart from each other and an injection and enthalpy increasing injection hole 27' disposed adjacent to each set of bypass holes 24', each of the bypass holes 24' and injection and enthalpy increasing injection holes 27' extending downwardly from an upper surface 23a ' of the hub 23' of the non-orbiting scroll member 20' through the hub 23' and the end plate 21' until being in fluid communication with the compression chamber. At the outer peripheral surface 23b 'of the hub 23' two exhaust grooves 25 'are provided, each exhaust groove 25' extending into each bypass hole of a corresponding set of bypass holes 24', enabling the respective bypass holes of the set of bypass holes 24' to communicate with each other and with a low pressure region outside the non-orbiting scroll member 20 'via the exhaust grooves 25'. In other embodiments, a discharge groove may be provided to communicate all the bypass holes 24 'with each other and with the outside of the non-orbiting scroll member 20'. A communication groove 36 'for communicating all the bypass holes 24' is also provided at the upper surface 23a 'of the hub 23'. The sealing assembly 40' includes a generally annular pressure plate 41' and a sealing gasket 42', the pressure plate 41' and the sealing gasket 42' covering the upper surface 23a ' of the hub 23' and covering and sealing all of the bypass holes 24' and the jet enthalpy increasing injection holes 27'. The sealing assembly 40' may further include a plurality of bolts 43' or other fasteners securing the pressure plate 41' and the sealing gasket 42' to the upper surface 23a ' of the hub 23' and compressing, and a piston 44' movable up and down in the piston cavity 24a ' of each bypass hole 24 '.

Similar to the non-orbiting scroll member 20 of the previous embodiment, in the present embodiment, an injection enthalpy increasing inlet hole (not shown) is formed at the outer circumferential surface 21f 'of the end plate 21' of the non-orbiting scroll member 20 'as well, and an injection enthalpy increasing passage (not shown) connecting the injection enthalpy increasing inlet hole and the injection enthalpy increasing injection hole 27' is formed inside the end plate 21 'of the non-orbiting scroll member 20'. It should be understood that the present disclosure is not limited thereto and that the enhanced vapor injection holes and enhanced vapor injection passages may be formed at other locations of the non-orbiting scroll member, such as in the hub.

As shown in fig. 13 and 14, in the present embodiment, the fluid control device 50 'is disposed on the outer peripheral surface 23b' of the hub portion 23 'of the non-orbiting scroll member 20'. Thereby, the fluid flow path for controlling the up-and-down movement of the piston 44' can be further simplified, which will be further described with reference to fig. 15 to 17.

Fig. 15 shows a side view of the non-orbiting scroll member 20' illustrating the first and second fluid passages 31' and 32' located in the hub portion 23' of the non-orbiting scroll member 20'. FIG. 16 illustrates a cross-sectional view of non-orbiting scroll member 20 'taken along a vertical plane passing through the axis of first fluid passage 31'; fig. 17 shows a cross-sectional view of non-orbiting scroll member 20 'taken along a vertical plane passing through the axis of second fluid passage 32'. As shown in fig. 14 to 16, the first fluid passage 31' of the non-orbiting scroll member 20' extends from the outer peripheral surface 23b ' of the boss portion 23' to the inside of the boss portion 23 '. The first fluid passage 31 'includes a laterally extending section 31a' and a pressure taking hole 31b ', the pressure taking hole 31b' being provided at an inner end portion of the laterally extending section 31a 'and extending from an upper surface 23a' of the hub portion 23 'through the hub portion 23' and the end plate 21 'down to a lower surface 21b' of the end plate 21', whereby the pressure taking hole 31b' is in fluid communication with a predetermined high pressure region in the compression chamber. In the spiral fluid compression path of the non-orbiting scroll member 20', the pressure relief hole 31b' may be positioned radially inward of the bypass holes 24', i.e., the pressure relief hole 31b' is closer to the center of the non-orbiting scroll member 20 'than each of the bypass holes 24'. In the assembled state, the pressure taking hole 31b ' is sealed by the pressure plate 41' and the sealing gasket 42' at the upper surface 23a ' of the hub portion 23 '. As shown in fig. 14, 15 and 17, the second fluid passage 32' in the non-orbiting scroll member 20' extends from the outer peripheral surface 23b ' of the boss portion 23' to the inside of the boss portion 23 '. The second fluid passage 32 'includes a laterally extending section 32a' and a communication hole 32b ', the communication hole 32b' extending upwardly from an inner end of the laterally extending section 32a 'into a communication groove 36' of the upper surface 23a 'of the hub 23'. In the assembled state, the communication hole 32b 'and the communication groove 36' are sealed by the pressing plate 41 'and the sealing gasket 42'.

Similar to the fluid control device 50 according to the previous embodiment, the fluid control device 50' is located between the first fluid passage 31' and the second fluid passage 32' and is configured to selectively fluidly connect or disconnect the first fluid passage 31' to the second fluid passage 32' to vary a pressure difference above and below the piston 44', thereby controlling the piston 44' to move up and down using the pressure difference. In the embodiment in which the fluid control device 50' is a solenoid valve, when the solenoid valve is de-energized, the solenoid valve places the first fluid passage 31' in fluid communication with the second fluid passage 32', and high-pressure fluid from a high-pressure region corresponding to the pressure taking hole 31b ' flows into the piston chamber 24a ' of each bypass hole 24' via the first fluid passage 31', the second fluid passage 32', and the communication groove 36'. Thus, the pressure above the piston 44' is greater than the pressure below the piston 44', and the piston 44' is forced by the high pressure fluid above it to drop to the second position, thereby blocking the bypass orifice 24' and the discharge groove 25', such that the scroll compressor is in a full load operating condition. When the solenoid valve is energized, the solenoid valve disconnects the first fluid passage 31 'from the second fluid passage 32'. At this time, the high-pressure fluid located above the piston 44' in the piston chamber 24a ' of each bypass hole 24' is discharged through the fluid path in the solenoid valve, so that the pressure below the piston 44' is greater than the pressure above the piston 44'. Thus, the piston 44' moves upward to the first position to place the bypass port 24' in fluid communication with the discharge groove 25', and fluid in the corresponding compression chamber flows out through the bypass port 24' and the discharge groove 25 '.

Another aspect of the present disclosure provides a method of machining a non-orbiting scroll assembly. The non-orbiting scroll assembly may include a non-orbiting scroll member having a non-orbiting scroll and an end plate. The method may include: machining at least one set of holes in the non-orbiting scroll member, each set of holes in the at least one set of holes including a bypass hole and an injection enthalpy increasing injection hole; a seal assembly is machined for sealing each or all of the at least one set of holes. In particular, the step of machining at least one set of holes may include machining bypass holes and jet enthalpy injection holes from an upper surface of the end plate toward the respective compression chambers; the step of machining at least one set of holes may also include machining bypass holes and jet enthalpy increasing injection holes from an upper surface of the hub toward the corresponding compression chamber. Preferably, a portion of the material may be removed from the fixed wrap of the fixed scroll member during processing of the enhanced vapor injection holes. In addition, the method may further include the step of machining a communication groove that communicates each set of bypass holes or all the bypass holes with each other and is capable of communicating with the high pressure region at the upper surface of the non-orbiting scroll member. Specifically, the communication groove may be formed on the upper surface of the end plate of the fixed scroll member or the upper surface of the boss portion. In addition, the method may further include the step of machining a discharge groove in the non-orbiting scroll member that communicates each set of bypass holes or all of the bypass holes with each other and with a low pressure region outside the non-orbiting scroll member. The exhaust groove may be machined in a recess of the upper surface of the end plate or on the outer peripheral surface of the hub portion. The above steps do not have to be performed in the order described herein.

In embodiments of the present disclosure, the bypass holes and the injection enthalpy increasing injection holes are disposed adjacent to each other on the upper surface of the non-orbiting scroll member, and sealing of these holes may be accomplished simultaneously by a common sealing assembly. Therefore, the structure and the processing process of the scroll compressor can be simplified, the requirement for sealing parts is reduced, the sealing structure is integrated and compact, and the processing time consumption can be reduced correspondingly. Further, by providing a communication groove that communicates two or more bypass holes with each other and can communicate with the high pressure region on the upper surface of the non-orbiting scroll, it is possible to simultaneously introduce high pressure fluid into the corresponding plurality or all of the bypass holes, thereby simultaneously controlling the plurality or all of the bypass holes to communicate with or to be disconnected from the low pressure region using the piston in the bypass hole. Providing a discharge groove that communicates two or more bypass holes with each other and with a low pressure region outside the non-orbiting scroll member is advantageous in increasing the discharge area. The communicating groove and the exhaust groove are simple in structure and convenient to machine.

On the other hand, the perforation from the upper surface of the non-orbiting scroll part may extend a portion of the perforation into the non-orbiting scroll so as to enlarge the aperture by a portion of the thickness of the non-orbiting scroll part, thereby increasing the flow area of the corresponding fluid passage without deteriorating the sealing performance of the scroll compressor. In particular, the aperture and flow area of the jet enthalpy increasing jet orifice can be significantly increased according to embodiments of the present disclosure.

Herein, exemplary embodiments of a non-orbiting scroll assembly, a scroll compressor, and a method of machining a non-orbiting scroll assembly according to the present disclosure have been described in detail, but it should be understood that the present disclosure is not limited to the specific embodiments described and illustrated in detail above. The various embodiments according to the present disclosure may be used alone or in combination. Those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the disclosure. All such modifications and variations are intended to be within the scope of this disclosure. Moreover, all the components described herein may be replaced by other technically equivalent elements.

Claims (25)

1. A non-orbiting scroll assembly, the non-orbiting scroll assembly comprising:

a non-orbiting scroll member provided with an end plate and a non-orbiting wrap extending from one side of the end plate, wherein the non-orbiting scroll member is provided with at least one set of holes, each set of holes including a bypass hole through which a fluid in a compression chamber can be discharged to a low pressure region outside the non-orbiting scroll member, and an injection enthalpy increasing fluid outside a compressor including the non-orbiting scroll assembly can be supplied into the compression chamber through the injection enthalpy increasing injection hole; and

a seal assembly configured to seal a set of holes of the at least one set of holes.

2. The non-orbiting scroll assembly of claim 1, wherein the non-orbiting scroll member includes two or more sets of apertures spaced apart in a circumferential direction.

3. The non-orbiting scroll assembly of claim 1, wherein the seal assembly includes a piston disposed in the bypass bore and movable between a first position allowing the respective compression chamber to be in fluid communication with the low pressure region and a second position preventing the respective compression chamber from being in fluid communication with the low pressure region.

4. A non-orbiting scroll assembly according to claim 3, further comprising a fluid control device configured to control the pressure differential above and below the piston by introducing fluid having a predetermined pressure above the piston to control the movement of the piston.

5. The non-orbiting scroll assembly of claim 4, wherein the non-orbiting scroll member further includes a fluid passage communicating the bypass bore to a high pressure region having a pressure of fluid greater than a pressure of fluid in the compression chamber in communication with the bypass bore; the fluid control device includes a valve configured to selectively connect or disconnect the fluid passage to vary a pressure differential above and below the piston.

6. A non-orbiting scroll assembly according to claim 5, wherein a communication groove is provided in an upper surface of the non-orbiting scroll member, communicating all or a subset of the bypass holes with each other and with at least one of the fluid passages, the communication groove being sealed by the seal assembly.

7. The non-orbiting scroll assembly of claim 6, wherein the fluid passages include a first fluid passage extending from an outer peripheral surface of the non-orbiting scroll member to the high pressure region and a second fluid passage extending from the outer peripheral surface of the non-orbiting scroll member to the communication slot, the valve being located between the first and second fluid passages.

8. The non-orbiting scroll assembly of claim 4, wherein the bypass hole and the injection enthalpy increasing injection hole extend from an upper surface of the end plate to respective compression chambers.

9. The non-orbiting scroll assembly of claim 8, wherein the fluid control device is disposed on an outer peripheral surface of the end plate.

10. A non-orbiting scroll assembly according to claim 8, wherein a recess is provided on the upper surface of the end plate, and a vent groove is provided on a side wall of the recess, the vent groove being configured such that all or a group of the bypass holes can communicate with each other and with the low pressure region via the vent groove.

11. The non-orbiting scroll assembly of claim 4, wherein the non-orbiting scroll member includes a boss portion protruding in an axial direction from an upper surface of the end plate, the bypass hole and the injection enthalpy increasing injection hole extending from an upper surface of the boss portion to the respective compression chamber.

12. The non-orbiting scroll assembly of claim 11, wherein the fluid control device is disposed on an outer peripheral surface of the hub.

13. A non-orbiting scroll assembly according to claim 11, wherein a bleed groove is provided on the outer peripheral surface of the hub, the bleed groove being configured such that all or a subset of the bypass holes can communicate with each other and with the low pressure region via the bleed groove.

14. The non-orbiting scroll assembly of any one of claims 1 to 13, wherein the non-orbiting scroll member further comprises an enhanced vapor injection hole positioned at an outer peripheral surface of the end plate and an enhanced vapor injection passage extending inside the end plate and connecting the enhanced vapor injection hole with the enhanced vapor injection hole.

15. The non-orbiting scroll assembly according to any one of claims 1 to 13, wherein the injection enthalpy increasing injection hole includes a recess formed in the fixed wrap.

16. The non-orbiting scroll assembly of any one of claims 1 to 13, wherein the seal assembly includes a sealing gasket and a pressure plate covering and sealing the bypass aperture and the enhanced vapor injection aperture.

17. The non-orbiting scroll assembly of claim 16, wherein the seal assembly further comprises a fastener that secures the seal gasket and the pressure plate to the non-orbiting scroll member.

18. A scroll compressor comprising a non-orbiting scroll assembly according to any one of claims 1 to 17.

19. A method of machining a non-orbiting scroll assembly including a non-orbiting scroll member having a non-orbiting wrap and an end plate, the method comprising:

machining at least one set of holes in the non-orbiting scroll member, each set of holes of the at least one set of holes including a bypass hole through which fluid within a compression chamber can be discharged to a low pressure region external to the non-orbiting scroll member, and an enthalpy-increasing jet fluid external to a compressor including the non-orbiting scroll assembly can be fed into the compression chamber through the enthalpy-increasing jet hole; and

a seal assembly is processed for sealing a set of holes of the at least one set of holes.

20. The method of claim 19, wherein machining the at least one set of holes comprises: and machining the bypass hole and the jet enthalpy increasing jet hole from the upper surface of the end plate toward the corresponding compression chamber.

21. The method of claim 20, the method further comprising: a communication groove that communicates each set of bypass holes or all bypass holes with each other and is capable of communicating with a high pressure region in which the pressure of fluid is greater than the pressure of fluid in the compression chamber communicating with the bypass holes is formed on the upper surface of the end plate.

22. The method of claim 20, the method further comprising: a recess is provided on the upper surface of the end plate, and an exhaust groove for communicating each set of bypass holes and with the low pressure region is provided on a side wall of the recess.

23. The method of claim 19, wherein the non-orbiting scroll member includes a hub projecting in an axial direction from an upper surface of the end plate, and wherein machining the at least one set of holes includes: the bypass hole and the injection enthalpy increasing injection hole are machined from the upper surface of the hub toward the corresponding compression chamber.

24. The method of claim 23, the method further comprising: a communication groove that communicates each set of bypass holes or all bypass holes with each other and is capable of communicating with a high pressure region in which the pressure of fluid is greater than the pressure of fluid in the compression chamber communicating with the bypass holes is formed on the upper surface of the hub.

25. The method of claim 23, the method further comprising: an exhaust groove is formed on an outer circumferential surface of the hub portion so that each set of bypass holes or all the bypass holes communicate with each other and with the low pressure region.