Scroll compressor

Abstract

To provide a scroll compressor capable of reducing refrigerant leakage from an injection port.SOLUTION: A scroll compressor comprises a fixed scroll member 110 and an orbiting scroll member 120, and an injection port 111c through which an intermediate pressure refrigerant is introduced is formed in a fixed end plate 111. The injection port 111c, according to the orbiting motion of the orbiting scroll member 120, communicates with either an inner compression chamber or an outer compression chamber, or faces a tooth tip 122a of an orbiting wrap 122. When the region of the tooth tip 122a that faces the injection port 111c during the orbital motion of the orbiting scroll member 120 is defined as a facing region R0, and the region of the tooth tip 122a located inward of the facing region R0 in a spiral direction is defined as an inner region R1, a gap between the facing region R0 and a tooth bottom 111a is smaller than a gap between the inner region R1 and the tooth bottom 111a.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to scroll compressors. [Background technology]

[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 equipped with a scroll in which tip seals are provided at the tooth tips of a scroll body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2018 / 096824 [Patent Document 2] International Publication No. 2017 / 126181 Summary of the Invention [Problem to be solved by the invention]

[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, rather than 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 potentially causing 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. [Means for solving the problem]

[0009] In order to solve the above problems, the scroll compressor of the present disclosure employs the following measures. 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 a rotating end plate arranged opposite the fixed end plate on which a spiral-shaped orbiting wrap is provided, the orbiting wrap meshing with the fixed wrap to form a compression chamber, the compression chamber 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 the fixed end plate has an injection port through which an intermediate-pressure refrigerant is introduced. 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. [Effects of the Invention]

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

[0011] [Figure 1] 1 is a vertical cross-sectional view of a scroll compressor according to a first embodiment and a second embodiment of the present disclosure, in which a fixed scroll member and an orbiting scroll member are meshed with each other. FIG. [Figure 2] 2 is a cross-sectional view of the scroll compressor according to the first embodiment taken along the line AA in FIG. 1 (an injection port communicates with an inner compression chamber C1). [Figure 3A] 2 is a cross-sectional view of the scroll compressor according to the first embodiment taken along the cutting line AA in FIG. 1 (where the injection port faces the orbiting wrap). [Figure 3B] 2 is a cross-sectional view of the scroll compressor according to the first embodiment taken along the cutting line AA in FIG. 1 (where the injection port faces the orbiting wrap). [Figure 4] 2 is a cross-sectional view of the scroll compressor according to the first embodiment taken along the line AA in FIG. 1 (an injection port communicates with an outer compression chamber C2). [Figure 5] 1 is a cross-sectional view taken along the spiral direction of a fixed scroll member and an orbiting scroll member near an injection port in a first embodiment of the present disclosure. FIG. [Figure 6] FIG. 10 is a cross-sectional view taken along the spiral direction of the fixed scroll member and the orbiting scroll member in the vicinity of the injection port in Modification 1-1 of the first embodiment of the present disclosure. [Figure 7] FIG. 10 is a cross-sectional view taken along the spiral direction of the fixed scroll member and the orbiting scroll member in the vicinity of the injection port in Modification 1-2 of the first embodiment of the present disclosure. [Figure 8] FIG. 10 is a cross-sectional view taken along the spiral direction of the fixed scroll member and the orbiting scroll member in the vicinity of the injection port in Modification 1-3 of the first embodiment of the present disclosure. [Figure 9] 2 is a cross-sectional view of a scroll compressor according to a second embodiment taken along line AA in FIG. 1. FIG. [Figure 10]FIG. 10 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 second embodiment of the present disclosure. [Figure 11] FIG. 10 is a cross-sectional view taken along the spiral direction of the fixed scroll member and the orbiting scroll member in the vicinity of the injection port in Modification 2-1 of the second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

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

[0013] The scroll compressor 100 is one of the devices that constitute the refrigeration cycle of an air conditioner or the like, and has a function of compressing the 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), as well as piping connecting these devices. The refrigeration cycle is, for example, a known injection cycle, and is configured so that an intermediate-pressure refrigerant (for example, gas refrigerant) is introduced to 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 constitute a compression mechanism, and are housed in a housing (not shown) in a state where they are meshed 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, but may be made partially of a different material (a different type of metal or a material other than metal).

[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 substantially disk-shaped portion that is fixed directly or indirectly to the housing. The fixed end plate 111 is formed with an injection port 111c and a discharge port 111d. The injection port 111c and the discharge port 111d are both holes that penetrate the fixed end plate 111 in the thickness direction thereof. 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 (more specifically, the inner compression chamber C1 or the outer compression chamber C2, which will be described later). Note that the intermediate-pressure refrigerant is introduced from outside the scroll compressor 100, as described above. One end of the discharge port 111d communicates with 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 communicates with 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 111 a ”) toward the orbiting end plate 121 of the orbiting scroll member 120 . The 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 rotating end plate 121 is a generally disk-shaped portion connected to a crankshaft (not shown). The orbiting end plate 121 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 upright on the tooth bottom of the orbiting end plate 121 (hereinafter referred to as the “orbiting-side tooth bottom 121 a ”) toward the fixed end plate 111 of the fixed scroll member 110 . The 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. 2 to 4, the inner compression chamber C1 is a portion of the compression chamber C0 that is in contact with the inner peripheral surface of the orbiting wrap 122. In other words, the inner compression chamber C1 is the compression chamber C0 that is formed by the inner peripheral surface of the orbiting wrap 122 and the outer peripheral surface of the fixed wrap 112. On the other hand, the outer compression chamber C2 is a part of the compression chamber C0 that is in contact with the outer peripheral surface of the orbiting wrap 122. In other words, the outer compression chamber C2 is the compression chamber C0 that is formed by the outer peripheral surface of the orbiting wrap 122 and the inner peripheral surface of the fixed wrap 112.

[0023] An opening of the injection port 111c (an opening on the side where the refrigerant is injected) is disposed on the fixed-side tooth bottom 111a between the fixed wraps 112 of the fixed scroll member 110. More specifically, the opening of the injection port 111c is disposed 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 shifted from the predetermined location by an extension angle of approximately 360 degrees (approximately 2π [rad]). As a result, the injection port 111c alternately communicates with either the inner compression chamber C1 or the outer compression chamber C2 as the orbiting scroll member 120 orbits. Specifically, in the first half of the orbiting motion, the injection port 111c communicates with the inner compression chamber C1 (see FIG. 2), and in 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 at 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). In other words, strictly speaking, there are two opposing regions R0 at 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." Also, the region of the orbiting-side tooth tip 122a located inside (closer to the center) than the opposing region R0 in the spiral direction of the orbiting wrap 122 is defined as an "inner region R1." Also, the region of the orbiting-side 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 an "outer region R2." 2 and 4, the boundary lines between the opposing region R0, the inner region R1, and the outer region R2 shown by the two-dot chain lines are imaginary lines and do not actually exist. Furthermore, these boundary lines may not be precise and may include errors.

[0026] The fixed end plate 111 of the fixed scroll member 110 has a fixed side tooth bottom 111a which is a flat surface formed on the same plane. On the other hand, the orbiting-side tooth tip 122a of the orbiting wrap 122 of the orbiting scroll member 120 is configured so that the gap between it and the fixed-side tooth bottom 111a changes depending on the position in the spiral direction. Specifically, as shown in Fig. 5, the gap between the opposing region R0 of the orbiting-side tooth tip 122a and the fixed-side tooth bottom 111a is configured to be smaller than the gap between the inner region R1 of the orbiting-side tooth tip 122a and the fixed-side tooth bottom 111a. This reduces 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 when the injection port 111c faces the orbiting side tooth tip 122a during the orbiting motion of the orbiting scroll member 120.

[0027] A seal groove (groove portion) 122c extending along the spiral direction and having a substantially constant depth along the spiral direction is formed in the orbiting-side tooth tip 122a corresponding to the inner region R1. A tip seal 130 is housed 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 against and comes into contact with the fixed-side tooth bottom 111a, thereby sealing the refrigerant. Thus, 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 with 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 set to be 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, so when the injection port 111c faces the orbiting-side tooth tip 122a during the orbiting motion of the orbiting scroll member 120, it is possible to reduce 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, thereby improving 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 in accordance with the orbiting motion of the orbiting scroll member 120, it is possible to inject refrigerant into the inner compression chamber C1 and the outer compression chamber C2 from the single injection port 111c. Specifically, in one orbiting motion, the injection port 111c can be communicated with the inner compression chamber C1 in the first half of the orbiting motion, and the injection port 111c can be communicated with the outer compression chamber C2 in the second half of the orbiting motion. During the latter half of the orbital motion, 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 will 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, refrigerant will be injected into the compression chamber C0 for almost the entire period of the orbital motion. This improves the performance of the scroll compressor 100.

[0031] <Variation 1-1> In the example of Figure 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 gradually changed.

[0032] <Variation 1-2> As shown in FIG. 7, a predetermined portion 122b of the orbiting wrap 122 including the facing region R0 may be made of a material that is more susceptible to wear than the fixed end plate 111 of the fixed scroll member 110. This makes it possible to reduce the gap to such an extent that the opposing region R0 of the orbiting-side tooth tip 122a comes into contact with the fixed-side tooth bottom 111a of the fixed end plate 111, thereby further reducing the amount of refrigerant that leaks. An example of a material that is more easily worn than the fixed end plate 111 is an abradable paint.

[0033] <Variation 1-3> As shown in FIG. 8, the injection port 111c may be inclined. Specifically, the injection port 111c may be inclined relative 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, and the capacity of the scroll compressor 100 can be improved.

[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 different from the scroll compressor according to the first embodiment in the configuration of the orbiting scroll member, but the other configurations are the same. Therefore, the same components as those in the first embodiment are denoted 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 seal groove 122c is configured so that its depth 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-side tooth tip 122a is configured to be 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 that is the target of the seal groove 122c. In this case, the protrusion 122c1 may be formed of a different material from the other portions, or may be installed later in the portion / region that is the target of the seal groove 122c, which has a substantially constant depth along the spiral direction. This makes it easier for the tip seal 130 housed in the seal groove 122c to be pressed 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 approximately constant along the spiral direction.

[0038] The scroll compressor according to this embodiment has 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). Therefore, the tip seal 130 accommodated in the seal groove 122c is not easily pressed in by the pressure of the refrigerant injected from 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 communicates with either the inner compression chamber C1 or the outer compression chamber C2 in accordance with the orbiting motion of the orbiting scroll member 120, it is possible to inject refrigerant into the inner compression chamber C1 and the outer compression chamber C2 from the single injection port 111c. Specifically, in one orbiting motion, the injection port 111c is communicated with the inner compression chamber C1 in the first half of the orbiting motion, so that refrigerant is injected into the inner compression chamber C1, and in the second half of the orbiting motion, the injection port 111c is communicated with the outer compression chamber C2, so that refrigerant is injected into the outer compression chamber C2. During the latter half of the orbital motion, 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 will flow back from the inner compression chamber C1 to the injection port 111c, creating a dead volume. Therefore, during 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] <Variation 2-1> In the example of Figure 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 facing region R0 and other regions may be connected by an inclined portion, so that the depth of the seal groove 122c changes gradually.

[0041] [Note] 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 includes 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 an orbiting end plate (121) arranged opposite the fixed end plate and having a spiral-shaped orbiting wrap (122) on which the orbiting wrap is meshed with the fixed wrap to form a compression chamber (C0), the compression chamber including an inner compression chamber (C1) in contact with an inner circumferential surface of the orbiting wrap and an outer compression chamber (C2) in contact with an outer circumferential 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 air 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 inside 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] Since 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 movement 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, thereby improving the capacity of the scroll compressor. In addition, since the injection port is connected to either the inner compression chamber or the outer compression chamber as the orbiting scroll member orbits, the refrigerant can be injected into both the inner compression chamber and the outer compression chamber through a single injection port. Specifically, during one orbital motion, the injection port is connected to the inner compression chamber to inject the refrigerant into the inner compression chamber in the first half of the orbital motion, and the injection port is connected to the outer compression chamber to inject the refrigerant into the outer compression chamber in the second half of the orbital motion.

[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 a third aspect of the present disclosure is the scroll compressor of 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 contacts the tooth bottom of the fixed end plate to seal the refrigerant.

[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 from the injection port. As a result, 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 performance of the scroll compressor. In addition, since the injection port is connected to either the inner compression chamber or the outer compression chamber as the orbiting scroll member orbits, the refrigerant can be injected into both the inner compression chamber and the outer compression chamber through a single injection port. Specifically, during one orbital motion, the injection port is connected to the inner compression chamber to inject the refrigerant into the inner compression chamber in the first half of the orbital motion, and the injection port is connected to the outer compression chamber to inject the refrigerant into the outer compression chamber in the second half of the orbital motion.

[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. [Explanation of symbols]

[0052] 100 Scroll Compressor 110 Fixed scroll member 111 Fixed end plate 111a Fixed side tooth bottom 111c injection port 111d Discharge port 112 Fixed Wrap 120 orbiting scroll member 121 Swivel end plate 121a Swivel side tooth root 122 Turning Lap 122a Swivel side tooth tip 122b Specified part 122c seal groove 122c1 Protrusion 130 Chip Seal C0 compression chamber C1 inner compression chamber C2 Outer compression chamber R0 Opposing Domain R1 inner area R2 outer domain

Claims

1. 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 disposed opposite the fixed end plate and having a spiral orbiting wrap provided thereon, the orbiting wrap meshing with the fixed wrap to form a compression chamber; Equipped with the compression chamber includes 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, An injection port through which an intermediate-pressure refrigerant is introduced is formed in the fixed end plate, the injection port communicates with either the inner compression chamber or the outer compression chamber in accordance with the orbiting movement of the orbiting scroll member, or faces a tooth tip of the orbiting wrap; When the region of the tooth tip that faces the injection port when the orbiting scroll member orbits is defined as a facing region, and the region of the tooth tip that is located inside the facing region in the spiral direction is defined as an inner region, a gap between the facing region and the tooth bottom of the fixed end plate is smaller than a gap between the inner region and the tooth bottom. Scroll compressor.

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

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

4. 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 disposed opposite the fixed end plate and having a spiral orbiting wrap provided thereon, the orbiting wrap meshing with the fixed wrap to form a compression chamber; A groove extending along the spiral direction is formed on the tooth tip of the orbiting wrap, a tip seal that is housed in the groove and contacts the tooth bottom of the fixed end plate to seal in the refrigerant; Equipped with the compression chamber includes 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, An injection port through which an intermediate-pressure refrigerant is introduced is formed in the fixed end plate, the injection port communicates with either the inner compression chamber or the outer compression chamber in accordance with the orbiting movement of 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. Scroll compressor.

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

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