Scroll compressor

Abstract

Provided is a scroll compressor which makes it possible to reduce the amount of refrigerant that leaks from an injection port. The present invention comprises a fixed scroll member (110) and an orbiting scroll member (120), wherein: a fixed end plate (111) has formed therein an injection port (111c) into which a refrigerant having an intermediate pressure is led; in accordance with an orbiting motion of the orbiting scroll member (120), the injection port (111c) communicates with one of an inner compression chamber and an outer compression chamber or faces a tooth tip (122a) of an orbiting wrap (122); and a gap between a facing region (R0) and a tooth bottom (111a) is smaller than a gap between an inner region (R1) and the tooth bottom (111a) where the facing region (R0) is a region of the tooth tip (122a) facing the injection port (111c) when the orbiting scroll member (120) orbits, and the inner region (R1) is a region of the tooth tip (122a) further inward than the facing region (R0) in the spiral direction.

Description

Scroll Compressor

[0001] The present disclosure relates to scroll compressors.

[0002] For example, Patent Document 1 discloses a scroll compressor having a fixed scroll in which an injection port is formed that sequentially opens to a first compression chamber formed on the outer wall side of the wrap of the orbiting scroll and a second compression chamber formed on the inner wall side of the wrap.

[0003] Furthermore, for example, Patent Document 2 discloses a scroll compressor having a scroll in which tip seals are provided at the tooth tips of a scroll body.

[0004] International Publication No. WO 2018 / 096824 International Publication No. WO 2017 / 126181

[0005] The scroll compressor of Patent Document 1 has a structure in which the orbiting scroll is pressed against the fixed scroll to seal the gap between the tooth tip of the wrap of one scroll and the tooth bottom of the end plate of the other scroll.

[0006] The scroll compressor of Patent Document 2 is structured so that, instead of pressing one scroll against the other, a tip seal is used to seal between the tooth tip of the spiral body of one scroll and the tooth bottom of the base plate of the other scroll.

[0007] When an injection port such as that described in Patent Document 1 is provided in a scroll compressor that employs a sealing structure using a tip seal, when the tip seal provided on the wrap of one of the scroll members passes through the area facing the injection port, the tip seal may be pushed in by the pressure of the refrigerant injected from the injection port, reducing the sealing ability and resulting in refrigerant leakage.

[0008] The present disclosure has been made in view of the above circumstances, and has an object to provide a scroll compressor that can reduce the amount of refrigerant leaking from an injection port.

[0009] In order to solve the above problems, the scroll compressor of the present disclosure employs the following means: That is, a scroll compressor according to one aspect of the present disclosure includes a fixed scroll member having a fixed end plate on which a spiral-shaped fixed wrap is provided, and an orbiting scroll member having an orbiting end plate arranged opposite the fixed end plate and having a spiral-shaped orbiting wrap on which the orbiting wrap meshes with the fixed wrap to form compression chambers, the compression chambers including an inner compression chamber in contact with an inner circumferential surface of the orbiting wrap and an outer compression chamber in contact with an outer circumferential surface of the orbiting wrap, and an injection port provided in the fixed end plate to introduce intermediate-pressure refrigerant is formed, and the injection port communicates with either the inner compression chamber or the outer compression chamber as the orbiting scroll member or faces the tooth tip of the orbiting wrap as the orbiting scroll member orbits, and when the area of ​​the tooth tip that faces the injection port when the orbiting scroll member orbits is defined as the opposing area and the area of ​​the tooth tip that is more inward than the opposing area in the spiral direction is defined as the inner area, the gap between the opposing area and the tooth bottom of the fixed end plate is smaller than the gap between the inner area and the tooth bottom.

[0010] According to the present disclosure, the amount of refrigerant leaking from the injection port can be reduced.

[0011] 1A and 1B are longitudinal cross-sectional views of the scroll compressor according to the first embodiment and the second embodiment of the present disclosure, in a state in which the fixed scroll member and the orbiting scroll member are meshed. A cross-sectional view of the scroll compressor according to the first embodiment, taken along the cutting line A-A in FIG. 1 (the injection port is in communication with the inner compression chamber C1). A cross-sectional view of the scroll compressor according to the first embodiment, taken along the cutting line A-A in FIG. 1 (the injection port faces the orbiting wrap). A cross-sectional view of the scroll compressor according to the first embodiment, taken along the cutting line A-A in FIG. 1 (the injection port faces the orbiting wrap). A cross-sectional view of the scroll compressor according to the first embodiment, taken along the cutting line A-A in FIG. 1 (the injection port is in communication with the outer compression chamber C2). A cross-sectional view of the fixed scroll member and the orbiting scroll member in the vicinity of the injection port in the first embodiment of the present disclosure, taken along the spiral direction. A cross-sectional view of the fixed scroll member and the orbiting scroll member in the vicinity of the injection port in a modified example 1-1 of the first embodiment of the present disclosure, taken along the spiral direction. A cross-sectional view of the fixed scroll member and the orbiting scroll member in the vicinity of the injection port in a modified example 1-2 of the first embodiment of the present disclosure, taken along the spiral direction. 1 is a cross-sectional view taken along the spiral direction of the fixed scroll member and the orbiting scroll member near the injection port in a modified example 1-3 of the first embodiment of the present disclosure. 2 is a cross-sectional view taken along the cutting line A-A in FIG. 1 in a scroll compressor according to a second embodiment. 3 is a cross-sectional view taken along the spiral direction of the fixed scroll member and the orbiting scroll member near the injection port in a modified example 2-1 of the second embodiment of the present disclosure.

[0012] First Embodiment A scroll compressor according to a first embodiment of the present disclosure will be described below with reference to the drawings.

[0013] The scroll compressor 100 is one of the devices that make up a refrigeration cycle of, for example, an air conditioner, and has a function of compressing a refrigerant sealed in the refrigeration cycle. In addition to the scroll compressor 100, the refrigeration cycle includes devices such as a condenser, an expansion valve, and an evaporator (not shown), and piping that connects these devices. The refrigeration cycle is, for example, a known injection cycle, and is configured so that an intermediate-pressure refrigerant (for example, a gas refrigerant) is introduced into the scroll compressor 100.

[0014] As shown in FIG. 1 , the scroll compressor 100 includes a fixed scroll member 110 and an orbiting scroll member 120. The fixed scroll member 110 and the orbiting scroll member 120 form a compression mechanism and are housed in a housing (not shown) while meshing with each other. The fixed scroll member 110 and the orbiting scroll member 120 mesh with each other to form a compression chamber C0. The fixed scroll member 110 and the orbiting scroll member 120 are made of metal, such as aluminum alloy or iron. However, they may be made partially of different materials (other types of metals or materials other than metals).

[0015] The fixed scroll member 110 has a fixed end plate 111 and a fixed wrap 112 provided on the fixed end plate 111 .

[0016] The fixed end plate 111 is a generally circular plate-shaped portion fixed directly or indirectly to the housing. An injection port 111c and a discharge port 111d are formed in the fixed end plate 111. The injection port 111c and the discharge port 111d are both holes that penetrate the fixed end plate 111 in its thickness direction. An intermediate-pressure refrigerant is introduced into one end of the injection port 111c, and the other end of the injection port 111c is connected to the compression chamber C0. This allows the intermediate-pressure refrigerant to be injected from the injection port 111c into the compression chamber C0 (specifically, the inner compression chamber C1 or the outer compression chamber C2, described later). As described above, the intermediate-pressure refrigerant is introduced from outside the scroll compressor 100. One end of the discharge port 111d is connected to the highest pressure portion of the compression chamber C0 (the central portion of the compression chamber C0), and the other end of the discharge port 111d is connected to the external space of the compression chamber C0 (for example, the space in contact with the back surface of the fixed end plate 111). This allows high-pressure refrigerant to be discharged from the compression chamber C0 to the external space of the compression chamber C0.

[0017] The fixed wrap 112 is a spiral wall body that stands on the tooth bottom of the fixed end plate 111 (hereinafter referred to as the "fixed-side tooth bottom 111a") toward the orbiting end plate 121 of the orbiting scroll member 120. This spiral is defined using, for example, an involute curve or an Archimedes curve.

[0018] The orbiting scroll member 120 has an orbiting end plate 121 and an orbiting wrap 122 provided on the orbiting end plate 121 .

[0019] The orbiting end plate 121 is a generally disk-shaped portion connected to a crankshaft (not shown) and is parallel to the fixed end plate 111 of the fixed scroll member 110.

[0020] The orbiting wrap 122 is a spiral wall body that stands on the tooth bottom of the orbiting end plate 121 (hereinafter referred to as the "orbiting-side tooth bottom 121a") toward the fixed end plate 111 of the fixed scroll member 110. This spiral is defined using a curve similar to that of the fixed wrap 112.

[0021] The fixed scroll member 110 and the orbiting scroll member 120 configured as described above are meshed together to form a compression chamber C0. Furthermore, the orbiting scroll member 120 orbits relative to the fixed scroll member 110 due to a driving force transmitted from a crankshaft (not shown), and the volume of the compression chamber C0 gradually decreases from the outer periphery toward the center, compressing the refrigerant.

[0022] The compression chamber C0 includes an inner compression chamber C1 and an outer compression chamber C2. As shown in FIGS. 2 to 4 , the inner compression chamber C1 is a portion of the compression chamber C0 that contacts the inner circumferential surface of the orbiting wrap 122. In other words, the inner compression chamber C1 is the compression chamber C0 formed by the inner circumferential surface of the orbiting wrap 122 and the outer circumferential surface of the fixed wrap 112. On the other hand, the outer compression chamber C2 is a portion of the compression chamber C0 that contacts the outer circumferential surface of the orbiting wrap 122. In other words, the outer compression chamber C2 is the compression chamber C0 formed by the outer circumferential surface of the orbiting wrap 122 and the inner circumferential surface of the fixed wrap 112.

[0023] The opening of the injection port 111c (the opening through which the refrigerant is injected) is located on the fixed-side tooth bottom 111a between the fixed wraps 112 of the fixed scroll member 110. Specifically, the opening of the injection port 111c is located on the fixed-side tooth bottom 111a approximately midway between a predetermined location on the fixed wrap 112 and another location on the fixed wrap 112 that is offset from the predetermined location by an extension angle of approximately 360 degrees (approximately 2π [rad]). As a result, as the orbiting scroll member 120 orbits, the injection port 111c alternately communicates with either the inner compression chamber C1 or the outer compression chamber C2. Specifically, during the first half of the orbiting motion, the injection port 111c communicates with the inner compression chamber C1 (see FIG. 2), and during the second half of the orbiting motion, the injection port 111c communicates with the outer compression chamber C2 (see FIG. 4), and this cycle is repeated thereafter.

[0024] As shown in Figures 3A and 3B, when the orbiting side tooth tip 122a of the orbiting wrap 122 passes through the area facing the injection port 111c as the orbiting scroll member 120 rotates and the communication target of the injection port 111c switches from the inner compression chamber C1 to the outer compression chamber C2 (or from the outer compression chamber C2 to the inner compression chamber C1), the injection port 111c temporarily faces the orbiting side tooth tip 122a of the orbiting wrap 122.

[0025] Here, the region of the orbiting-side tooth tip 122a of the orbiting wrap 122 that faces the injection port 111c when the orbiting scroll member 120 orbits is defined as the "opposing region R0." Note that the position of the opposing region R0 on the orbiting-side tooth tip 122a differs when the communication target of the injection port 111c switches from the inner compression chamber C1 to the outer compression chamber C2 (see FIG. 3A ) and when the communication target of the injection port 111c switches from the outer compression chamber C2 to the inner compression chamber C1 (see FIG. 3B ). Strictly speaking, there are two opposing regions R0 on the orbiting-side tooth tip 122a. However, in this embodiment, the region from one opposing region R0 to the other opposing region R0 is collectively defined as the "opposing region R0." Furthermore, the region of the orbiting-side tooth tip 122a that is located inside (closer to the center of) the opposing region R0 in the spiral direction of the orbiting wrap 122 is defined as the "inner region R1." Furthermore, the region of the orbiting tooth tip 122a located outside (farther from the center) than the opposing region R0 in the spiral direction of the orbiting wrap 122 is defined as the "outer region R2." Note that the boundary lines between the opposing region R0, the inner region R1, and the outer region R2 shown by the two-dot chain lines in Figures 2 and 4 are imaginary lines and do not actually exist. Furthermore, these boundary lines are not precise and may include errors.

[0026] The fixed end plate 111 of the fixed scroll member 110 has a flat surface formed on the same plane. Meanwhile, the orbiting tooth tip 122a of the orbiting wrap 122 of the orbiting scroll member 120 is configured so that the gap between the orbiting tooth tip 122a and the fixed tooth bottom 111a varies depending on the position in the spiral direction. Specifically, as shown in FIG. 5 , the gap between the facing region R0 of the orbiting tooth tip 122a and the fixed tooth bottom 111a is smaller than the gap between the inner region R1 of the orbiting tooth tip 122a and the fixed tooth bottom 111a. This reduces the amount of refrigerant leaking from the injection port 111c through the gap between the orbiting tooth tip 122a and the fixed tooth bottom 111a when the injection port 111c faces the orbiting tooth tip 122a during orbital movement of the orbiting scroll member 120.

[0027] The orbiting-side tooth tip 122a corresponding to the inner region R1 has a seal groove (groove portion) 122c extending along the spiral direction and having a substantially constant depth along the spiral direction. A tip seal 130 is accommodated in the seal groove 122c. Compressed refrigerant is guided between the seal groove 122c and the tip seal 130. As a result, the tip seal 130 is pressed into contact with the fixed-side tooth bottom 111a, sealing the refrigerant. In this way, the scroll compressor 100 is a type that seals the refrigerant with the tip seal 130, and is not a type that seals the refrigerant by, for example, pressing the fixed scroll member 110 against the orbiting scroll member 120 using back pressure.

[0028] The gap between the outer region R2 of the orbiting-side tooth tip 122a and the fixed-side tooth bottom 111a may be approximately the same size as the gap between the opposing region R0 and the fixed-side tooth bottom 111a, or may be approximately the same size as the gap between the inner region R1 and the fixed-side tooth bottom 111a. If the gap between the outer region R2 and the fixed-side tooth bottom 111a is approximately the same size as the gap between the inner region R1 and the fixed-side tooth bottom 111a, it is preferable to also provide a tip seal 130 on the orbiting-side tooth tip 122a corresponding to the outer region R2.

[0029] The scroll compressor according to this embodiment has the following advantages: The gap between the opposing region R0 of the orbiting-side tooth tip 122a and the fixed-side tooth bottom 111a is smaller than the gap between the inner region R1 of the orbiting-side tooth tip 122a and the fixed-side tooth bottom 111a. Therefore, when the injection port 111c faces the orbiting-side tooth tip 122a during the orbiting motion of the orbiting scroll member 120, the amount of refrigerant leaking from the injection port 111c through the gap between the orbiting-side tooth tip 122a and the fixed-side tooth bottom 111a can be reduced. This improves the performance of the scroll compressor 100.

[0030] Furthermore, since the injection port 111c communicates with either the inner compression chamber C1 or the outer compression chamber C2 as the orbiting scroll member 120 orbits, refrigerant can be injected into both the inner compression chamber C1 and the outer compression chamber C2 through a single injection port 111c. Specifically, during one orbital movement, the injection port 111c can be communicated with the inner compression chamber C1 in the first half of the orbital movement and with the outer compression chamber C2 in the second half of the orbital movement. In the second half of the orbital movement, the pressure in the inner compression chamber C1 becomes higher than the pressure of the refrigerant injected through the injection port 111c. Therefore, if the injection port 111c continues to communicate with the inner compression chamber C1, refrigerant would flow back from the inner compression chamber C1 to the injection port 111c, creating a dead volume. Therefore, by switching the communication target of the injection port 111c to the outer compression chamber C2, which has a lower pressure than the refrigerant being injected, during the latter half of the orbital motion, the refrigerant is injected into the compression chamber C0 for almost the entire period of the orbital motion, thereby improving the performance of the scroll compressor 100.

[0031] 5, the opposing region R0 and the inner region R1 are connected by a step, and the height of the orbiting-side tooth tip 122a changes in a step-like manner from the opposing region R0 to the inner region R1 (or from the inner region R1 to the opposing region R0). However, as shown in FIG. 6, the opposing region R0 and the inner region R1 may be connected by an inclined portion, and the height of the orbiting-side tooth tip 122a may be changed gradually.

[0032] 7, a predetermined portion 122b of the orbiting wrap 122, including the opposing region R0, may be formed of a material that is more easily worn than the fixed end plate 111 of the fixed scroll member 110. This makes it possible to reduce the gap to the extent that the opposing region R0 of the orbiting-side tooth tip 122a contacts the fixed-side tooth bottom 111a of the fixed end plate 111, thereby further reducing the amount of refrigerant leakage. An example of a material that is more easily worn than the fixed end plate 111 is an abradable paint.

[0033] <Modification 1-3> As shown in Fig. 8, the injection port 111c may be inclined. Specifically, the injection port 111c may be inclined with respect to a direction perpendicular to the fixed-side tooth bottom 111a of the fixed end plate 111 of the fixed scroll member 110 so that intermediate-pressure refrigerant can be injected along the flow of refrigerant in the compression chamber C0. This increases the amount of refrigerant injected, thereby improving the performance of the scroll compressor 100.

[0034] Second Embodiment A scroll compressor according to a second embodiment of the present disclosure will be described below with reference to the drawings. The scroll compressor according to this embodiment is identical to the scroll compressor of the first embodiment except for the configuration of the orbiting scroll member. Therefore, the same components as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0035] 9, a seal groove 122c extending along the spiral direction is formed in the orbiting-side tooth tip 122a corresponding to the opposing region R0, the inner region R1, and the outer region R2. A tip seal 130 is housed in the seal groove 122c over the entire region.

[0036] As shown in FIG. 10 , the depth of the seal groove 122c varies depending on the position in the spiral direction. Specifically, the depth of the seal groove 122c formed in the opposing region R0 of the orbiting tooth tip 122a is shallower than the depth of the seal groove 122c formed in other regions (the inner region R1 and the outer region R2). This is achieved, for example, by providing a protrusion 122c1 in the portion / region targeted by the seal groove 122c. In this case, the protrusion 122c1 may be formed of a different material from the other portions, or may be retrofitted to the portion / region targeted by the seal groove 122c, which has a substantially constant depth along the spiral direction. This prevents the tip seal 130 housed in the seal groove 122c from being easily pushed in by the pressure of the refrigerant injected from the injection port 111c.

[0037] The depth of the seal groove 122c in each region is substantially constant along the spiral direction.

[0038] The scroll compressor according to this embodiment offers the following advantages. The depth of the seal groove 122c formed in the opposing region R0 of the orbiting-side tooth tip 122a is shallower than the depth of the seal groove 122c formed in other regions (the inner region R1 and the outer region R2). This prevents the tip seal 130 housed in the seal groove 122c from being easily compressed by the pressure of the refrigerant injected through the injection port 111c. Therefore, when the injection port 111c faces the orbiting-side tooth tip 122a (tip seal 130) during the orbiting motion of the orbiting scroll member 120, the amount of refrigerant leaking from the injection port 111c through the gap between the tip seal 130 and the fixed-side tooth bottom 111a can be reduced. This improves the performance of the scroll compressor 100.

[0039] Furthermore, since the injection port 111c is connected to either the inner compression chamber C1 or the outer compression chamber C2 as the orbiting scroll member 120 orbits, refrigerant can be injected into both the inner compression chamber C1 and the outer compression chamber C2 through the single injection port 111c. Specifically, during one orbital movement, the injection port 111c is connected to the inner compression chamber C1 in the first half of the orbital movement to inject refrigerant into the inner compression chamber C1, and the injection port 111c is connected to the outer compression chamber C2 in the second half of the orbital movement to inject refrigerant into the outer compression chamber C2. During the second half of the orbital movement, the pressure in the inner compression chamber C1 becomes higher than the pressure of the refrigerant injected through the injection port 111c. Therefore, if the injection port 111c continues to be connected to the inner compression chamber C1, refrigerant would flow back from the inner compression chamber C1 to the injection port 111c, creating a dead volume. Therefore, in the latter half of the orbital motion, the injection port 111c is switched to communicate with the outer compression chamber C2, which has a lower pressure than the refrigerant being injected. This allows refrigerant to be injected into the compression chamber C0 for almost the entire period of the orbital motion, improving the performance of the scroll compressor 100.

[0040] 10, the opposing region R0 and the other region are connected by a step, and the depth of the seal groove 122c changes in a step-like manner from the opposing region R0 to the other region (or from the other region to the opposing region R0). However, as shown in FIG. 11, the opposing region R0 and the other region may be connected by an inclined portion, and the depth of the seal groove 122c may change gradually.

[0041] [Additional Notes] The scroll compressors according to the first and second embodiments of the present disclosure described above can be understood, for example, as follows.

[0042] A scroll compressor (100) according to a first aspect of the present disclosure comprises a fixed scroll member (110) having a fixed end plate (111) on which a spiral-shaped fixed wrap (112) is provided, and an orbiting scroll member (120) having a rotating end plate (121) arranged opposite the fixed end plate on which a spiral-shaped orbiting wrap (122) is provided, the orbiting wrap meshing with the fixed wrap to form a compression chamber (C0), the compression chamber including an inner compression chamber (C1) in contact with an inner peripheral surface of the orbiting wrap and an outer compression chamber (C2) in contact with an outer peripheral surface of the orbiting wrap, and an intermediate-pressure refrigerant is supplied to the fixed end plate. An injection port (111c) is formed through which the injection port is introduced, and the injection port communicates with either the inner compression chamber or the outer compression chamber as the orbiting scroll member rotates, or faces the tooth tip of the orbiting wrap.When the area of ​​the tooth tip that faces the injection port when the orbiting scroll member rotates is defined as an opposing area (R0), and the area of ​​the tooth tip that is more inward than the opposing area in the spiral direction is defined as an inner area (R1), the gap between the opposing area and the tooth bottom of the fixed end plate is smaller than the gap between the inner area and the tooth bottom.

[0043] Because the gap between the facing region and the tooth bottom of the fixed end plate is smaller than the gap between the inner region and the tooth bottom, when the injection port faces the tooth tip of the orbiting wrap during orbital motion of the orbiting scroll member, the amount of refrigerant leaking from the injection port through the gap between the tooth tip of the orbiting wrap and the tooth bottom of the fixed end plate can be reduced. This improves the capacity of the scroll compressor. Furthermore, since the injection port is connected to either the inner compression chamber or the outer compression chamber as the orbiting scroll member orbits, refrigerant can be injected into both the inner compression chamber and the outer compression chamber through a single injection port. Specifically, during a single orbital motion, the injection port is connected to the inner compression chamber to inject refrigerant, and during the latter half of the orbital motion, the injection port is connected to the outer compression chamber to inject refrigerant.

[0044] A second aspect of the present disclosure provides the scroll compressor of the first aspect, wherein the opposing region is formed of a material that is more easily worn than the fixed end plate.

[0045] Since the opposing area is formed from a material that is more susceptible to wear than the fixed end plate, the gap can be reduced to the point where the opposing area comes into contact with the tooth base of the fixed end plate, further reducing the amount of refrigerant that leaks.

[0046] The scroll compressor according to the third aspect of the present disclosure is the first or second aspect, in which a groove portion (122c) extending along the spiral direction is formed in the inner region, and a tip seal (130) is housed in the groove portion and seals the refrigerant by contacting the tooth bottom of the fixed end plate.

[0047] The inner region has a groove extending along the spiral direction, and is equipped with a tip seal that is housed in the groove and seals the refrigerant by contacting the tooth bottom of the fixed end plate, thereby sealing the gap between the tooth tip of the inner region and the tooth bottom of the fixed end plate, thereby reducing the amount of refrigerant that leaks.

[0048] A scroll compressor according to a fourth aspect of the present disclosure includes a fixed scroll member having a fixed end plate on which a spiral-shaped fixed wrap is provided, an orbiting scroll member having an orbiting end plate arranged opposite the fixed end plate and having a spiral-shaped orbiting wrap on which the orbiting wrap meshes with the fixed wrap to form a compression chamber, and a tip seal having a groove formed in a tooth tip of the orbiting wrap and extending along the spiral direction, the tip seal being accommodated in the groove and contacting a tooth bottom of the fixed end plate to seal a refrigerant, the compression chamber being an inner compression chamber in contact with an inner circumferential surface of the orbiting wrap and a tip seal having a groove formed in a tooth tip of the orbiting wrap and a tip seal having a groove formed in a tooth bottom of the fixed end plate to seal a refrigerant. The rotary scroll includes an outer compression chamber in contact with the outer peripheral surface of the orbiting wrap, and an injection port through which an intermediate-pressure refrigerant is introduced is formed in the fixed end plate, and the injection port communicates with either the inner compression chamber or the outer compression chamber as the orbiting scroll member or faces the tooth tip of the orbiting wrap, and when the area of ​​the tooth tip that faces the injection port when the orbiting scroll member orbits is defined as the facing area, the depth of the groove formed in the facing area is shallower than the depth of the groove formed in other areas of the tooth tip.

[0049] The depth of the grooves formed in the facing region is shallower than the depth of the grooves formed in other regions of the tooth tips, so the tip seals housed in the grooves are not easily pressed in by the pressure of the refrigerant injected through the injection port. Therefore, when the injection port faces the tooth tips (tip seals) of the orbiting wrap during the orbiting motion of the orbiting scroll member, the amount of refrigerant leaking from the injection port through the gap between the tip seal and the tooth bottom of the fixed end plate can be reduced. This improves the capacity of the scroll compressor. Furthermore, since the injection port is connected to either the inner compression chamber or the outer compression chamber as the orbiting scroll member orbits, refrigerant can be injected into both the inner and outer compression chambers through a single injection port. Specifically, during one orbital motion, the injection port is connected to the inner compression chamber to inject refrigerant, and during the latter half of the orbital motion, the injection port is connected to the outer compression chamber to inject refrigerant.

[0050] A scroll compressor according to a fifth aspect of the present disclosure is any one of the first to fourth aspects, wherein the injection port is formed at an angle so as to inject intermediate-pressure refrigerant along the flow of refrigerant in the compression chamber.

[0051] The injection port is formed at an angle so that intermediate-pressure refrigerant is injected along the flow of refrigerant in the compression chamber, thereby increasing the amount of refrigerant injected and improving the capacity of the scroll compressor.

[0052] REFERENCE SIGNS LIST 100 Scroll compressor 110 Fixed scroll member 111 Fixed end plate 111a Fixed side tooth root 111c Injection port 111d Discharge port 112 Fixed wrap 120 Orbiting scroll member 121 Orbiting end plate 121a Orbiting side tooth root 122 Orbiting wrap 122a Orbiting side tooth tip 122b Predetermined portion 122c Seal groove 122c1 Protruding portion 130 Tip seal C0 Compression chamber C1 Inner compression chamber C2 Outer compression chamber R0 Opposing region R1 Inner region R2 Outer region

Claims

1. A scroll compressor comprising: a fixed scroll member having a spiral-shaped fixed wrap provided on a fixed end plate; and an orbiting scroll member having a spiral-shaped orbiting wrap provided on an orbiting end plate arranged opposite the fixed end plate, the orbiting wrap meshing with the fixed wrap to form compression chambers, wherein the compression chambers include an inner compression chamber in contact with the inner peripheral surface of the orbiting wrap and an outer compression chamber in contact with the outer peripheral surface of the orbiting wrap, wherein the fixed end plate is formed with an injection port through which intermediate-pressure refrigerant is introduced, and the injection port communicates with either the inner compression chamber or the outer compression chamber as the orbiting scroll member or faces the tooth tips of the orbiting wrap, wherein when the area of ​​the tooth tips that faces the injection port when the orbiting scroll member orbits is defined as an opposing area, and the area of ​​the tooth tips that is inside the opposing area in the spiral direction is defined as an inner area, the gap between the opposing area and the tooth bottom of the fixed end plate is smaller than the gap between the inner area and the tooth bottom.

2. The scroll compressor according to claim 1, wherein the opposing region is made of a material that is more susceptible to wear than the fixed end plate.

3. A scroll compressor according to claim 1 or 2, wherein a groove extending along the spiral direction is formed in the inner region, and a tip seal is provided which is housed in the groove and contacts the tooth bottom of the fixed end plate to seal in the refrigerant.

4. A scroll compressor comprising: a fixed scroll member having a fixed end plate on which a spiral-shaped fixed wrap is provided; an orbiting scroll member having an orbiting end plate arranged opposite the fixed end plate and having a spiral-shaped orbiting wrap provided on the orbiting end plate, the orbiting wrap meshing with the fixed wrap to form a compression chamber; a groove extending along the spiral direction formed on the tooth tip of the orbiting wrap, and a tip seal accommodated in the groove and contacting the tooth bottom of the fixed end plate to seal the refrigerant; wherein the compression chamber includes an inner compression chamber in contact with the inner peripheral surface of the orbiting wrap and an outer compression chamber in contact with the outer peripheral surface of the orbiting wrap; an injection port formed in the fixed end plate through which intermediate-pressure refrigerant is introduced; and the injection port communicates with either the inner compression chamber or the outer compression chamber as the orbiting scroll member or faces the tooth tip of the orbiting wrap, When the area of ​​the tooth tip that faces the injection port when the orbiting scroll member orbits is defined as an opposing area, the depth of the groove formed in the opposing area is shallower than the depth of the groove formed in other areas of the tooth tip.

5. A scroll compressor according to claim 1 or 4, wherein the injection port is formed at an angle so as to inject intermediate-pressure refrigerant along the flow of refrigerant in the compression chamber.

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