CN117365944A - 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 non-orbiting scroll member includes an end plate and a non-orbiting scroll extending from a first side of the end plate. The non-orbiting scroll member is provided with an enhanced vapor injection hole extending from an upper surface of the non-orbiting scroll member to the compression chamber, and enhanced vapor injection fluid external to the compressor including the non-orbiting scroll member is capable of being fed into the compression chamber via the enhanced vapor injection hole, the enhanced vapor injection hole having a first end opening into the compression chamber and a second end opening to the exterior of the non-orbiting scroll member. The seal assembly is configured to seal the second end of the jet enthalpy increasing injection orifice. Preferably, a portion of the injection hole includes a recess formed in the fixed scroll. The embodiments of the present disclosure facilitate simplifying the machining process of the scroll compressor, and may also significantly expand the flow area of the injection enthalpy-increasing injection holes.

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.

In the scroll compressor, refrigerant can be supplemented to a designated position of a compression cavity through an injection enthalpy-increasing injection hole in fluid communication with the compression cavity of the scroll compressor so as to achieve an enthalpy-increasing effect, and the performance of the compressor is improved. In a conventional scroll compressor, an injection hole for injecting enthalpy is generally processed from a side of an end plate of a non-orbiting scroll member on which a non-orbiting wrap is provided. In this case, the line of the fixed scroll must be avoided when drilling, and the injection enthalpy increasing injection hole must not exceed the line width of the movable scroll member to prevent the fluid in the corresponding compression chamber from leaking to the adjacent other compression chamber. Therefore, the process flow of processing the enhanced vapor injection holes in the prior art needs to be improved, and the size and the flow area of the enhanced vapor injection holes are limited.

Disclosure of Invention

It is an object of the present disclosure to simplify the construction and manufacturing process of scroll compressors.

Another object of the present disclosure is to increase the flow area of the injection enthalpy increasing injection holes in a scroll compressor.

An aspect of the present disclosure provides a non-orbiting scroll assembly including a non-orbiting scroll member and a seal assembly. The non-orbiting scroll member includes an end plate and a non-orbiting scroll extending from a first side of the end plate. The non-orbiting scroll member is provided with an enhanced vapor injection hole extending from an upper surface of the non-orbiting scroll member to the compression chamber, an enhanced vapor injection fluid external to the compressor including the non-orbiting scroll member being capable of being fed into the compression chamber via the enhanced vapor injection hole, the enhanced vapor injection hole having a first end opening into the compression chamber and a second end opening into the exterior of the non-orbiting scroll member. The seal assembly is configured to seal the second end of the jet enthalpy increasing injection orifice.

In one embodiment, the enhanced vapor injection holes may include a first portion and a second portion. The first portion extends to a first side of the end plate and does not overlap the fixed wrap as viewed in an axial direction of the fixed scroll assembly. The second portion extends through the end plate into the fixed wrap and overlaps the fixed wrap as viewed in an axial direction of the fixed scroll assembly, the second portion including a recess formed in the fixed wrap.

In one embodiment, the jet enthalpy increasing injection holes may extend through the end plate from a second side of the end plate opposite the first side.

In one embodiment, the non-orbiting scroll member may include a hub projecting in an axial direction from a second side of the end plate opposite the first side, with the enhanced vapor injection holes extending from an upper surface of the hub through the hub and the end plate.

In one embodiment, the non-orbiting scroll member may further include an enhanced vapor injection hole and an enhanced vapor injection passage connecting the enhanced vapor injection hole and the enhanced vapor injection hole, the enhanced vapor injection hole having a hydraulic diameter less than or equal to a hydraulic diameter of the enhanced vapor injection passage.

In one embodiment, the depth of the recess is not more than 2/3 of the thickness of the fixed wrap in the thickness direction of the fixed wrap.

In one embodiment, the height of the recess in the axial direction of the non-orbiting scroll member is greater than or equal to the hydraulic radius of the enhanced vapor injection orifice.

In one embodiment, the seal assembly may include a platen and a gasket seal.

In one embodiment, the seal assembly may further include a fastener securing the seal gasket and the pressure plate to the upper surface of the non-orbiting scroll member and compressing the seal gasket and the pressure plate.

In one embodiment, the non-orbiting scroll member may further include a bypass hole extending from an upper surface of the non-orbiting scroll member to the compression chamber, fluid in the compression chamber being able to be discharged to a low pressure region outside the non-orbiting scroll member via the bypass hole, and the sealing assembly sealing both the bypass hole and the injection enthalpy increasing injection hole.

In one embodiment, the non-orbiting scroll member may include two or more groups of holes spaced apart in a circumferential direction, wherein each group of holes includes at least one bypass hole and at least one injection enthalpy increasing injection hole.

In one embodiment, the non-orbiting scroll member may include two or more groups of holes spaced apart in a circumferential direction, wherein each group of holes includes at least one bypass hole and at least one injection enthalpy increasing injection hole.

In one embodiment, the seal assembly may include a piston disposed in the bypass bore and movable between a first position allowing fluid communication of the respective compression chambers with the low pressure region and a second position preventing fluid communication of the respective compression chambers 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, a communication groove that communicates the bypass holes with each other in the or each group of holes and is capable of communicating with a high pressure region, in which the pressure of fluid is greater than the pressure of fluid in a compression chamber communicating with the bypass holes, may be provided at an upper surface of the non-orbiting scroll, and the communication groove is sealed by a sealing assembly at the upper surface of the non-orbiting scroll.

In one embodiment, the non-orbiting scroll member may further include a discharge groove configured to enable all or a portion of the bypass holes to communicate with each other and with the low pressure region via the discharge groove.

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

Yet another aspect of the present disclosure provides a method of machining a non-orbiting scroll assembly according to the above aspects. The method comprises the following steps: machining at least one enhanced vapor injection hole in the non-orbiting scroll member extending from an upper surface of the non-orbiting scroll member to the compression chamber, wherein an enhanced vapor injection fluid external to the compressor including the non-orbiting scroll assembly is capable of being fed into the compression chamber via the enhanced vapor injection hole, the enhanced vapor injection hole having a first end opening into the compression chamber and a second end opening into the exterior of the non-orbiting scroll assembly; and a machined seal assembly configured to seal the second end of the enhanced vapor injection port.

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 side, 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 shows an enlarged view of region C in fig. 7;

FIG. 9 illustrates a perspective view of a compression mechanism of a scroll compressor according to another embodiment of the present disclosure;

fig. 10 shows an exploded view of the non-orbiting scroll assembly of fig. 9.

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 8. The scroll compressor may include a housing, a compression mechanism 1 accommodated in the housing, a driving mechanism for driving the compression mechanism 1, and the like. For simplicity, only the compression mechanism 1 and corresponding seal assembly of the scroll compressor are shown herein, while other well-known structures of scroll compressors 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 which cooperate with each other to form a compression chamber. Fig. 2 illustrates an exploded view of the non-orbiting scroll assembly of fig. 1, which 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 side, top and bottom views, respectively, of the non-orbiting scroll member 20, 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. 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 first side of the end plate 21, i.e., a lower surface 21b of the end plate 21. The non-orbiting scroll member 20 may further include a boss 23 protruding in an axial direction from an opposite second side of the end plate 21, i.e., an upper surface 21a opposite the lower surface 21 b. As shown in fig. 7, the orbiting scroll member 10 includes an end plate 11 and an orbiting wrap 12 protruding 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, the fixed scroll 22 defines a spiral fluid compression path from which fluid to be compressed flows in from the radially outer side, and from the discharge port 21c located at the substantially center of the end plate 21 after being compressed.

As shown in fig. 3 to 7, the non-orbiting scroll member 20 includes an injection enthalpy increasing inlet hole 24 formed at an outer peripheral surface 21d of the end plate 21, an injection enthalpy increasing injection hole 25 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 26 extending inside the end plate 21 and connecting the injection enthalpy increasing inlet hole 24 and the injection enthalpy increasing injection hole 25. In the present embodiment, the non-orbiting scroll member 20 includes two enhanced vapor injection holes 25 spaced apart in the circumferential direction of the non-orbiting scroll member 20. In other embodiments, any number of jet enthalpy increasing injection holes may be provided. As shown in fig. 7, the injection hole 25 has a first end 25a leading to the compression chamber and a second end 25b leading to the outside of the non-orbiting scroll assembly. When the scroll compressor is in operation, a first end 25a of the injection and enthalpy increasing injection hole 25 at the lower surface 21b of the end plate 21 is in fluid communication with the compression chamber, and a second end 25b of the injection and enthalpy increasing injection hole 25 at the upper surface 21a of the end plate 21 is sealed by the sealing assembly 40. 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 24, the enthalpy-increasing injection passage 26 and the enthalpy-increasing injection hole 25, thereby achieving an enthalpy-increasing effect and optimizing the performance of the scroll compressor.

As shown in fig. 1 and 2, the sealing assembly 40 may include a pressure plate 41 and a sealing gasket 42 for covering and sealing the injection enthalpy increasing injection holes 25, wherein the sealing gasket 42 is positioned between the pressure plate 41 and the injection enthalpy increasing injection holes 25. 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 pressing plates 41 and two sealing gaskets 42 are provided corresponding to the two injection enthalpy increasing injection holes 25. In other embodiments, any number of platens and sealing gaskets may be used, for example, a single platen and a single sealing gasket may be used to simultaneously seal multiple jet enthalpy injection holes. In other embodiments, any other suitable form of seal assembly may be employed.

As shown in fig. 7, the injection hole 25 includes a first portion that does not overlap the fixed scroll 22 as viewed in the axial direction and a second portion that overlaps the fixed scroll 22 as viewed in the axial direction. The second portion extends through the end plate into fixed scroll 22. In other words, the second portion of the injection hole 25 includes a recess 25c formed by removing a portion of material from the lower surface 21b of the end plate 21 of the fixed scroll 22 toward the fixed scroll 22.

Fig. 8 shows an enlarged view of the region C in fig. 7. Here, an enhanced vapor injection hole 25 and an enhanced vapor injection passage 26 having circular cross sections are shown. The diameter D1 of the enhanced vapor injection hole 25 is less than or equal to the diameter D2 of the enhanced vapor injection passage 26. When d1=d2, the flow path of the enhanced vapor injection fluid may have a constant flow area. Preferably, the depth W1 of the recess 25c formed by removing a part of the material from the fixed scroll 22 in the thickness direction of the fixed scroll 22 does not exceed 2/3 of the thickness W2 of the fixed scroll 22 to ensure that the fixed scroll 22 still has sufficient rigidity. Preferably, the height H of the recess 25c in the axial direction is greater than or equal to the radius of the jet enthalpy increasing jet orifice 25, i.e. H.gtoreq.1/2D 1, to achieve as large a flow area as possible.

Although various holes or channels, such as enhanced vapor injection holes, enhanced vapor injection channels, bypass holes, etc., are illustrated herein as holes or channels having a circular cross-section, it should be understood that the present disclosure is not limited to particular hole patterns and channel shapes. In other embodiments, any other suitable shape of aperture or passage may be used. For a hole or channel having a non-circular cross-section, the diameter or radius of the hole or channel as described herein should be understood as the hydraulic diameter or hydraulic radius of the hole or channel. The hydraulic diameter refers to the ratio of four times the flow cross-sectional area to the perimeter of the hole or channel and the hydraulic radius is the ratio of the flow cross-sectional area to the perimeter of the hole or channel.

As shown in fig. 8, in the prior art, the injection-enthalpy-increasing injection hole is usually drilled from the lower surface 21b of the end plate 21 of the fixed scroll member 20 (i.e., from the profile side of the fixed scroll 22), which requires that the injection-enthalpy-increasing injection hole must avoid the profile of the fixed scroll 22 and cannot exceed the profile width of the movable scroll 12 to prevent the fluid in the compression chamber in fluid communication with the injection-enthalpy-increasing injection hole from leaking to the adjacent other compression chamber. Therefore, the size and flow area of the jet enthalpy increasing jet hole in the prior art are limited. Fig. 8 shows the maximum dimension L1 of the injection hole in the thickness direction of the fixed scroll 22 and the movable scroll 12. In contrast, the injection-enthalpy-increasing injection holes 25 are drilled from the upper surface 21a of the end plate 21 of the fixed scroll member 20 according to the present embodiment, which can effectively avoid the fixed scroll 22 from obstructing the drilling process. Further, the present disclosure may utilize a portion of the thickness of the fixed scroll 22 to arrange the injection-enthalpy-increasing injection holes 25 to increase the size and flow area of the injection-enthalpy-increasing injection holes 25. Fig. 8 shows the maximum dimension L2 of the injection enthalpy increasing injection hole 25 in the thickness direction of the fixed scroll 22 and the moving scroll 12 according to the present disclosure. As can be seen, l2=l1+w1. That is, the maximum dimension L2 of the injection enthalpy increasing injection hole 25 of the scroll compressor according to the present disclosure in the thickness direction of the fixed wrap 22 and the movable wrap 12 is increased by the depth W1 of the recess 25c formed by removing part of the material from the fixed wrap 22, which may be 2/3 of the thickness W2 of the fixed wrap 22, compared to the corresponding maximum dimension L1 of the injection enthalpy increasing injection hole in the conventional scroll compressor. For circular holes, the largest dimensions L1 and L2 are understood as the diameter of the hole. For non-circular holes, the maximum dimensions L1 and L2 may limit the hydraulic diameter and flow area of the hole. The hydraulic diameter of the injection enthalpy increasing injection hole of the scroll compressor according to embodiments of the present disclosure may be increased by at least one time, and the flow area of the injection enthalpy increasing injection hole may be increased by at least four times, as compared to the conventional scroll compressor.

The scroll compressor may further include a variable displacement structure integrally designed with the enhanced vapor injection structure for varying the displacement of the scroll compressor without varying the rotational speed of the scroll compressor.

As shown in fig. 2-6, the non-orbiting scroll member 20 further includes one or more bypass holes 27 disposed adjacent to the enhanced vapor injection holes 25. The bypass holes 27 are located approximately at the middle of the spiral fluid compression path shown in fig. 5 and extend from the upper surface 21a of the end plate 21 over the lower surface 21b so as to extend through the end plate 21 to the compression chamber. The bypass holes 27 are disposed at the upper surface 21a of the end plate 21 in a group with the injection enthalpy increasing injection holes 25, and may be sealed by a common sealing assembly 40. In the present embodiment, two sets of bypass holes 27 spaced apart in the circumferential direction are provided corresponding to the two injection-enthalpy increasing injection holes 25, respectively, and each set of bypass holes 27 includes three bypass holes 27. In other embodiments, any number and number of sets of bypass holes may be provided. The displacement of the scroll compressor may be varied by selectively fluidly connecting or disconnecting the bypass port 27 to a low pressure region external to the non-orbiting scroll member 20. When the bypass hole 27 is blocked, the scroll compressor is operated in a full load operation state; the scroll compressor is operated in a partial load operation state when the bypass hole 27 is in fluid communication with the outside of the non-orbiting scroll member 20 such that the corresponding compression chamber is in fluid communication with the low pressure region of the scroll compressor.

As shown in fig. 1 and 2, a discharge groove 28 is provided at a side of each set of bypass holes 27, and the discharge groove 28 extends into each bypass hole of the set of bypass holes 27, so that the respective bypass holes of the set of bypass holes 27 can communicate with each other and the outside of the non-orbiting scroll member 20 via the discharge groove 28. In the present embodiment, the exhaust groove 28 is provided on the side wall 21f of the recess 21e recessed downward from the upper surface 21a of the end plate 21 adjacent to the bypass hole 27. As shown in fig. 2, the seal assembly 40 may also include a piston 44. An upper portion of the bypass hole 27 defines a piston chamber 27a, and a piston 44 is provided in the piston chamber 27a and is movable up and down between a first position and a second position in the piston chamber 27 a. When the piston 44 is raised to the first position, the bypass bore 27 is in fluid communication with the discharge groove 28 such that fluid in the respective compression chambers can be discharged to a low pressure region outside of the non-orbiting scroll member 20 via the bypass bore 27 and the discharge groove 28, thereby allowing the scroll compressor to operate in a part load operating condition. When the piston 44 is lowered to the second position, the passage between the bypass hole 27 and the discharge groove 28 is blocked by the piston 44, and the corresponding compression chamber is disconnected from the low pressure region, and the scroll compressor is operated in the full load operation state.

As shown in fig. 2 and 4, a communication groove 29 may be further provided at the upper surface 21a of the end plate 21 of the non-orbiting scroll member 20, the communication groove 29 being disposed around and communicating each of the bypass holes 27 of each group. The communication groove 29 also allows the bypass holes 27 to be in fluid communication with a high pressure area, the pressure of the fluid in which is greater than the pressure of the fluid in the compression chamber in communication with the respective bypass hole 27. In the assembled state, the bypass hole 27 and the communication groove 29 are covered and sealed by the pressure plate 41 and the sealing gasket 42 at the upper surface 21a of the end plate 21. By providing the communication groove 29, it is possible to simultaneously introduce fluid having a predetermined pressure to the upper surfaces of all the pistons 44 in one set of bypass holes 27, thereby varying the pressure difference above and below the pistons 44 so as to simultaneously control the movement of all the pistons 44 in each set of bypass holes 27. In other embodiments, a communication groove that communicates with all the bypass holes may be provided.

As shown in fig. 1 and 2, the scroll compressor may further include a fluid control device 50 for introducing fluid having a predetermined pressure to the upper surface of the piston 44, and controlling the movement of the piston 44 by controlling the pressure difference above and below the piston 44, thereby controlling the scroll compressor to be switched between the full load operation state and the 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 end plate 21 of the non-orbiting scroll member 20 is provided with a first fluid passage 31, a second fluid passage 32, and a third fluid passage 33 for connection to a fluid control device 50. In the present embodiment, a recess 21g for receiving and accommodating the fluid control device 50 is provided on the outer peripheral surface 21d of the end plate 21, and the first fluid passage 31, the second fluid passage 32, and the third fluid passage 33 extend from the outer peripheral surface 21d of the end plate 21 to the inside of the end plate 21 at the recess 21 g. The first fluid passage 31 extends to a predetermined high pressure region in the compression chamber. The high pressure region may be located radially inward of the bypass holes 27 on the spiral fluid compression path of the non-orbiting scroll member 20, i.e., closer to the center of the non-orbiting scroll member 20 than each of the bypass holes 27. Thus, the pressure of the fluid at the high pressure region is greater than the pressure of the fluid in the compression chamber in fluid communication with the bypass orifice 27. The second fluid passage 32 and the third fluid passage 33 are respectively in fluid communication with the communication grooves 29 of the respective corresponding two sets of bypass holes 27. The fluid control device 50 is disposed between the first fluid passage 31 and the second and third fluid passages 32, 33, and is configured to selectively fluidly connect or disconnect the first fluid passage 31 from the second and third fluid passages 32, 33. When the first fluid passage 31 is in fluid communication with the second fluid passage 32 and the third fluid passage 33, high-pressure fluid from a high-pressure region flows into the piston chamber 27a of the bypass hole 27 via the first fluid passage 31, the second fluid passage 32, the third fluid passage 33 and the communication groove 29 and acts on the upper surface of the piston 44, the pressure above the piston 44 is greater than the pressure below, and the piston 44 descends to the second position and blocks fluid communication of the bypass hole 27 with the exhaust groove 28. When the first fluid passage 31 is disconnected from the second fluid passage 32 and the third fluid passage 33, the high-pressure fluid located above the piston 44 in the piston chamber 27a of each bypass hole 27 is discharged via the fluid path in the fluid control device 50, so that the pressure below the piston 44 is greater than the pressure above the piston 44. Accordingly, the piston 44 moves upward to the first position to place the bypass hole 27 in fluid communication with the discharge groove 28, and fluid in the corresponding compression chamber can flow out through the bypass hole 27 and the discharge groove 28.

Fig. 9 to 10 illustrate a scroll compressor according to another embodiment of the present disclosure. The following description will be directed primarily to the differences between the scroll compressor and the scroll compressor described hereinabove, wherein identical or corresponding features or components are indicated with the same reference numerals with an apostrophe.

Fig. 9 shows a perspective view of the compression mechanism 1' of the 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. 10 illustrates an exploded view of the non-orbiting scroll assembly of fig. 9, which may include a non-orbiting scroll member 20 'and a seal assembly 40' and/or a fluid control device 50 'coupled to the non-orbiting scroll member 20'.

As shown in fig. 10, the non-orbiting scroll member 20' includes two injection-enthalpy increasing injection holes 25' spaced apart from each other and two sets of bypass holes 27' disposed adjacent to each injection-enthalpy increasing injection hole 25', each injection-enthalpy increasing injection hole 25' and bypass hole 27' extending downwardly from an upper surface 23a ' of the boss 23' of the non-orbiting scroll member 20' through the boss 23' and the end plate 21' until being in fluid communication with the compression chamber. Similar to the previous embodiment, each injection hole 25' may include a first portion that does not overlap the fixed wrap as viewed in the axial direction and a second portion that overlaps the fixed wrap as viewed in the axial direction. The second portion extends through the end plate 21 'into a fixed scroll (not shown) to enlarge the flow area of the enhanced vapor injection holes 25'.

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 21d '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 25' is formed inside the end plate 21 'of the non-orbiting scroll member 20'. However, the present disclosure is not limited thereto, and in other embodiments, the enhanced vapor injection holes and the enhanced vapor injection passages may be disposed at other locations, such as on the hub of the non-orbiting scroll member.

At the outer peripheral surface 23b 'of the hub 23' there are provided two exhaust grooves 28', each exhaust groove 28' extending into each bypass hole of a corresponding set of bypass holes 27', enabling the respective bypass holes of the set of bypass holes 27' to communicate with each other and with the outside of the non-orbiting scroll member 20 'via the exhaust grooves 28'. In other embodiments, a discharge groove may be provided that communicates all of the bypass holes 27 'with each other and with the outside of the non-orbiting scroll member 20'. A communication groove 29 'that communicates all of the bypass holes 27' is also provided in the upper surface 23a 'of the boss 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 portion 23' and covering and sealing all the enhanced vapor injection holes 25' and the bypass holes 27'. The sealing assembly 40' may further include a plurality of bolts 43' or other fastening structures that fix and compress the pressure plate 41' and the sealing gasket 42' to the upper surface 23a ' of the hub 23', and a piston 44' that is movable up and down in the piston chamber 27a ' of each bypass hole 27'.

As shown in fig. 9 and 10, 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'. Accordingly, the first fluid passage 31', the second fluid passage 32' for connection with the fluid control device 50 'extend from the outer peripheral surface 23b' of the hub 23 'to the inside of the hub 23'. The first fluid passage 31' is in fluid communication with a predetermined high pressure region in the compression chamber, which is closer to the center of the non-orbiting scroll member 20' than each of the bypass holes 27'. The second fluid channel 32' is in fluid communication with the communication groove 29' communicating with all the bypass holes 27'. Similar to the fluid control device 50 of the previous embodiment, the fluid control device 50' is disposed 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' so as to vary the pressure differential above and below the piston 44' to move the piston 44' up and down in the piston chamber 27a ' of the bypass bore 27', thereby controlling the scroll compressor to switch between the full load operating condition and the partial load operating condition.

Another aspect of the present disclosure provides a method of machining a non-orbiting scroll assembly according to the above aspects. The method may include: machining at least one injection enthalpy increasing injection hole in the non-orbiting scroll member extending from an upper surface of the non-orbiting scroll member to the compression chamber, an external injection enthalpy increasing fluid comprising a compressor of the non-orbiting scroll assembly being capable of being fed into the compression chamber via the injection enthalpy increasing injection hole, the injection enthalpy increasing injection hole having a first end opening into the compression chamber and a second end opening into the exterior of the non-orbiting scroll assembly; and machining a seal assembly configured to seal the second end of the enhanced vapor injection hole. The method may further comprise the corresponding step of machining features such as bypass holes, vent slots, communication slots, etc. as in the previous embodiments. The various steps described above do not have to be performed in the order described herein.

As described above, according to embodiments of the present disclosure, the injection-enthalpy-increasing injection holes are drilled from the upper surface of the non-orbiting scroll member (e.g., the upper surface of the end plate or the upper surface of the hub), and the injection-enthalpy-increasing injection holes may be arranged with a portion of the thickness of the fixed wrap, which may significantly simplify the machining process of the non-orbiting scroll assembly and enable an increase in the size and flow area of the injection-enthalpy-increasing injection holes without impairing the sealing performance of the scroll compressor. The hydraulic diameter of the injection enthalpy increasing injection hole of the scroll compressor according to embodiments of the present disclosure may be increased by at least one time, and the flow area of the injection enthalpy increasing injection hole may be increased by at least four times, as compared to the conventional scroll compressor. In addition, the jet enthalpy increasing structure and the variable displacement structure of the scroll compressor are integrally designed, so that the jet enthalpy increasing jet hole and the bypass hole can be sealed by a common sealing component. This simplifies the construction and machining of the scroll compressor and reduces the number of seals required. In particular, the injection enthalpy increasing injection hole, the bypass hole are disposed on the upper surface of the hub portion of the non-orbiting scroll member and a single communication groove communicating all the bypass holes is provided, and a single pressure plate and a single sealing gasket may be used to seal the respective holes and communication grooves, whereby the structure and the machining process of the scroll compressor may be further simplified and the number of required sealing parts may be further reduced.

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 (17)

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

a non-orbiting scroll member including an end plate and a non-orbiting wrap extending from a first side of the end plate, wherein the non-orbiting scroll member is provided with an enhanced vapor injection hole extending from an upper surface of the non-orbiting scroll member to a compression chamber through which enhanced vapor injection fluid external to a compressor including the non-orbiting scroll assembly can be fed into the compression chamber, the enhanced vapor injection hole having a first end opening to the compression chamber and a second end opening to the exterior of the non-orbiting scroll assembly; and

a seal assembly configured to seal the second end of the jet enthalpy increasing injection orifice.

2. The non-orbiting scroll assembly of claim 1, wherein the injection enthalpy increasing injection hole includes a first portion extending to the first side of the end plate and not overlapping the non-orbiting scroll as viewed in an axial direction of the non-orbiting scroll assembly and a second portion extending through the end plate into the non-orbiting scroll and overlapping the non-orbiting scroll as viewed in the axial direction of the non-orbiting scroll assembly, the second portion including a recess formed in the non-orbiting scroll.

3. The non-orbiting scroll assembly of claim 2, wherein the enhanced vapor injection holes extend through the end plate from a second side of the end plate opposite the first side.

4. The non-orbiting scroll assembly of claim 2, wherein the non-orbiting scroll member includes a hub projecting in the axial direction from a second side of the end plate opposite the first side, the jet enthalpy increasing injection holes extending from an upper surface of the hub through the hub and the end plate.

5. The non-orbiting scroll assembly of any one of claims 1 to 4, wherein the non-orbiting scroll member further comprises an enhanced vapor injection hole and an enhanced vapor injection channel connecting the enhanced vapor injection hole and the enhanced vapor injection hole, the enhanced vapor injection hole having a hydraulic diameter less than or equal to a hydraulic diameter of the enhanced vapor injection channel.

6. The non-orbiting scroll assembly according to any one of claims 2 to 4, wherein a depth of the recess in a thickness direction of the non-orbiting scroll is not more than 2/3 of a thickness of the non-orbiting scroll.

7. The non-orbiting scroll assembly of any one of claims 2 to 4, wherein a height of the recess in the axial direction of the non-orbiting scroll member is greater than or equal to a hydraulic radius of the enhanced vapor injection hole.

8. The non-orbiting scroll assembly of any one of claims 1 to 4, wherein the seal assembly comprises a pressure plate and a sealing gasket.

9. The non-orbiting scroll assembly of claim 8, wherein the seal assembly further comprises a fastener securing the seal gasket and the pressure plate to the upper surface of the non-orbiting scroll member and compressing.

10. The non-orbiting scroll assembly of any one of claims 1 to 4, wherein the non-orbiting scroll member further comprises a bypass bore extending from the upper surface of the non-orbiting scroll member to a compression chamber through which fluid in the compression chamber can drain to a low pressure region external to the non-orbiting scroll member, the seal assembly sealing both the bypass bore and the injection enthalpy injection hole.

11. The non-orbiting scroll assembly of claim 10, wherein the non-orbiting scroll member includes two or more sets of holes spaced apart in a circumferential direction, wherein each set of holes includes at least one of the bypass holes and at least one of the injection enthalpy increasing injection holes.

12. The non-orbiting scroll assembly of claim 11, 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.

13. The non-orbiting scroll assembly of claim 12, further comprising a fluid control device configured to control a pressure differential above and below the piston by introducing fluid having a predetermined pressure above the piston to control movement of the piston.

14. A scroll compressor according to claim 13, wherein a communication groove is provided in the upper surface of the non-orbiting scroll member which communicates all bypass holes or bypass holes in each group of holes with each other and is capable of communicating with a high pressure region where the pressure of fluid is greater than the pressure of fluid in the compression chamber communicating with the bypass holes, the communication groove being sealed by the seal assembly at the upper surface of the non-orbiting scroll member.

15. A scroll compressor as claimed in claim 13 or 14, wherein the non-orbiting scroll member further comprises a bleed groove configured to enable all or a subset of the bypass holes to communicate with each other and with the low pressure region via the bleed groove.

16. A scroll compressor comprising the non-orbiting scroll assembly according to any one of claims 1 to 15.

17. A method of machining a non-orbiting scroll assembly, the non-orbiting scroll assembly being according to any one of claims 1 to 15, the method comprising:

machining in a non-orbiting scroll member at least one enhanced vapor injection hole extending from an upper surface of the non-orbiting scroll member to a compression chamber, wherein enhanced vapor injection fluid comprising an exterior of a compressor of the non-orbiting scroll assembly is capable of being fed into the compression chamber via the enhanced vapor injection hole, the enhanced vapor injection hole having a first end opening into the compression chamber and a second end opening into the exterior of the non-orbiting scroll assembly; and

a seal assembly is machined and configured to seal the second end of the enhanced vapor injection port.