Compressors and refrigeration systems

Abstract

This prevents refrigerant from blowing out radially outward from the rotor through the gap between the axial end of the rotor and the weight cover. [Solution] The drive shaft (11) rotates the compression mechanism (35). The motor (30) has a rotor (32) that rotates the drive shaft (11). The balance weight (40) is provided at the axial end of the rotor (32). The weight cover (50) has a side wall portion (52) that covers the radially outward side of the balance weight (40). The closing member (80) closes the gap (45) between the axial end of the rotor (32) and the side wall portion (52) when viewed from the radial direction of the rotor (32).

Description

Technical Field

[0007]

[0001] The present disclosure relates to a compressor and a refrigeration device.

Background Art

[0002] Patent Document 1 discloses a compressor including a balance weight provided at the lower end of a rotor of an electric motor, and a weight cover formed in a circular cap shape covering the lower end surface of the rotor and the balance weight and arranged coaxially with the rotor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, a gap is provided between the weight cover covering the balance weight and the axial end of the rotor in consideration of the assemblability due to dimensional variations of the weight cover.

[0005] <00​​​​​​​​​​​A first aspect of the present disclosure is a compressor comprising: a compression mechanism (35); a drive shaft (11) for rotationally driving the compression mechanism (35); a motor (30) having a rotor (32) for rotating the drive shaft (11); a balance weight (40) provided at the axial end of the rotor (32); a weight cover (50) having a side wall portion (52) covering the radially outward side of the balance weight (40); and a closing member (80) that closes the gap (45) between the axial end of the rotor (32) and the side wall portion (52) when viewed from the radial direction of the rotor (32).

[0008] In the first embodiment, the blocking member (80) closes the gap (45) between the axial end of the rotor (32) and the side wall portion (52), thereby preventing the refrigerant from being blown radially outward from the gap (45) of the rotor (32).

[0009] A second aspect of the present disclosure is the compressor of the first aspect, wherein the rotor (32) has an end plate (33) located at the axial end of the rotor (32), and the closing member (80) is composed of a part of the end plate (33).

[0010] In the second embodiment, by forming the closing member (80) from a part of the end plate (33), it is not necessary to provide the closing member (80) as a separate component, and the assembly man-hours can be reduced.

[0011] A third aspect of the present disclosure is the compressor of the first aspect, wherein the blocking member (80) is composed of a part of the balance weight (40).

[0012] In the third embodiment, by making the closing member (80) part of the balance weight (40), it is not necessary to provide the closing member (80) as a separate component, and the assembly man-hours can be reduced.

[0013] A fourth aspect of the present disclosure is a compressor of any one of the first to third aspects, wherein the blocking member (80) is positioned radially inward from the weight cover (50).

[0014] In the fourth embodiment, the blocking member (80) can be arranged so that it does not interfere with the stator of the motor (30).

[0015] A fifth aspect of the present disclosure is a compressor of any one of the first to fourth aspects, wherein the blocking member (80) is arranged around the entire circumference of the weight cover (50).

[0016] In the fifth embodiment, the gap (45) can be sealed all around the weight cover (50) by arranging the closing member (80) around the entire circumference in the circumferential direction.

[0017] A sixth aspect of the present disclosure is a compressor according to any one of the first to fourth aspects, wherein, when viewed from the axial direction of the rotor (32), the region in the circumferential direction of the weight cover (50) where the weight portion (42) of the balance weight (40) is located is defined as a first region, and the region excluding the first region is defined as a second region, and the closing member (80) is located in the second region.

[0018] In the sixth embodiment, the gap (45) in the first region can be closed with the eccentric portion of the balance weight (40), and the gap (45) in the second region can be closed with the closing member (80).

[0019] A seventh aspect of this disclosure is a refrigeration system comprising a compressor (10) of any one of the first to sixth aspects.

[0020] In a seventh embodiment, a refrigeration system equipped with a compressor (10) can be provided. [Brief explanation of the drawing]

[0021] [Figure 1] Figure 1 is a refrigerant circuit diagram showing the configuration of the refrigeration system of this embodiment 1. [Figure 2] Figure 2 is a longitudinal cross-sectional view showing the configuration of a scroll compressor. [Figure 3] Figure 3 is a cross-sectional view showing the configuration of the balance weight, weight cover, and closure member. [Figure 4] FIG. 4 is a longitudinal sectional view showing the configurations of the balance weight, the weight cover, and the closing member. [Figure 5] FIG. 5 is a perspective view showing the configurations of the balance weight and the closing member. [Figure 6] FIG. 6 is a longitudinal sectional view showing the configurations of the balance weight, the weight cover, and the closing member according to Embodiment 2. [Figure 7] FIG. 7 is a perspective view showing the configurations of the balance weight and the closing member. [Figure 8] FIG. 8 is a longitudinal sectional view showing the configurations of the balance weight, the weight cover, and the closing member according to Embodiment 3. [Figure 9] FIG. 9 is a perspective view showing the configurations of the balance weight and the closing member. [Figure 10] FIG. 10 is a longitudinal sectional view showing the configurations of the balance weight, the weight cover, and the closing member according to Embodiment 4. [Figure 11] FIG. 11 is a perspective view showing the configurations of the balance weight and the closing member.

MODE FOR CARRYING OUT THE INVENTION

[0022] 《Embodiment 1》 As shown in FIG. 1, a compressor (10) is provided in a refrigeration apparatus (1). In the following, the compressor (10) will be described as a scroll compressor (10), but a rotary compressor may also be used.

[0023] The refrigeration apparatus (1) has a refrigerant circuit (1a) filled with a refrigerant. The refrigerant circuit (1a) includes a scroll compressor (10), a radiator (3), a decompression mechanism (4), and an evaporator (5). The decompression mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle.

[0024] The refrigeration system (1) is an air conditioning system. The air conditioning system may be a cooling-only unit, a heating-only unit, or an air conditioning system that switches between cooling and heating. In this case, the air conditioning system has a switching mechanism (e.g., a four-way switching valve) that switches the direction of refrigerant circulation. The refrigeration system (1) may also be a water heater, a chiller unit, a cooling system that cools the air inside a storage unit, etc. The cooling system cools the air inside a refrigerator, freezer, container, etc.

[0025] As shown in Figure 2, the scroll compressor (10) comprises a casing (20), a motor (30), and a compression mechanism (35). The casing (20) is formed in a vertically elongated cylindrical shape and is configured as a sealed dome type. The motor (30) and the compression mechanism (35) are housed in the casing (20).

[0026] The motor (30) has a stator (31) and a rotor (32). The stator (31) is fixed to the inner circumferential surface of the casing (20). The rotor (32) is positioned inside the stator (31). The drive shaft (11) passes through the rotor (32). The rotor (32) is fixed to the drive shaft (11). The rotor (32) rotates the drive shaft (11).

[0027] An oil reservoir (21) is provided at the bottom of the casing (20). Lubricating oil is stored in the oil reservoir (21). An intake pipe (12) is connected to the upper part of the casing (20). A discharge pipe (13) is connected to the body of the casing (20).

[0028] A housing (36) is fixed to the casing (20). The housing (36) is positioned above the motor (30). A compression mechanism (35) is positioned above the housing (36). The inlet end of the discharge pipe (13) is located between the motor (30) and the housing (36).

[0029] A recess (38) is formed in the housing (36). The recess (38) is formed by a part of the upper surface of the housing (36) being recessed. An upper bearing (37) is provided below the recess (38).

[0030] The drive shaft (11) extends vertically along the central axis of the casing (20). The drive shaft (11) has a main shaft portion (14) and an eccentric portion (15). The drive shaft (11) rotationally drives the compression mechanism (35).

[0031] The eccentric portion (15) is provided at the upper end of the main shaft portion (14). The lower part of the main shaft portion (14) is rotatably supported by a lower bearing (22). The lower bearing (22) is fixed to the inner circumferential surface of the casing (20). For example, a positive displacement pump (25) is provided on the lower bearing (22). The upper part of the main shaft portion (14) passes through the housing (36) and is rotatably supported by an upper bearing (37) of the housing (36).

[0032] The compression mechanism (35) comprises a fixed scroll (60) and a movable scroll (70). The fixed scroll (60) is fixed to the upper surface of the housing (36). The movable scroll (70) is positioned between the fixed scroll (60) and the housing (36).

[0033] The fixed scroll (60) comprises a fixed end plate (61), a fixed lap (62), and an outer peripheral wall (63). The outer peripheral wall (63) is formed in a substantially cylindrical shape. The outer peripheral wall (63) is erected on the outer edge of the front surface (bottom surface in Figure 2) of the fixed end plate (61).

[0034] The fixed-side wrap (62) is formed in a spiral shape. The fixed-side wrap (62) is erected inside the outer peripheral wall (63) of the fixed-side end plate (61).

[0035] The fixed end plate (61) is located on the outer circumference and is formed continuously with the fixed lap (62). The tip surface of the fixed lap (62) and the tip surface of the outer circumference wall (63) are formed to be substantially flush. The fixed scroll (60) is fixed to the housing (36).

[0036] The movable scroll (70) has a movable end plate (71), a movable lap (72), and a boss portion (73). The movable lap (72) is formed in a spiral shape. The movable lap (72) is formed on the upper surface of the movable end plate (71). The movable lap (72) engages with the fixed lap (62).

[0037] The boss portion (73) is formed in the center of the lower surface of the movable end plate (71). The eccentric portion (15) of the drive shaft (11) is inserted into the boss portion (73), and the drive shaft (11) is connected to it.

[0038] The compression mechanism (35) has a compression chamber (S) into which refrigerant flows. The compression chamber (S) is formed between a fixed scroll (60) and a movable scroll (70). The movable scroll (70) is arranged such that its movable side wrap (72) engages with the fixed side wrap (62) of the fixed scroll (60).

[0039] An intake port (64) is formed in the outer circumferential wall (63) of the fixed scroll (60). The intake port (64) opens near the end of the fixed wrap (62). The downstream end of the intake tube (12) is connected to the intake port (64).

[0040] A discharge port (65) is formed in the center of the fixed end plate (61) of the fixed scroll (60). The discharge port (65) opens on the upper surface of the fixed end plate (61) of the fixed scroll (60). The high-pressure gaseous refrigerant discharged from the discharge port (65) flows out into the lower space (24) through a passage (not shown) formed in the housing (36).

[0041] An oil supply passage (16) is formed inside the drive shaft (11). The oil supply passage (16) extends vertically from the lower end to the upper end of the drive shaft (11). The lower end of the drive shaft (11) is connected to a pump (25). The lower end of the pump (25) is immersed in an oil reservoir (21). As the drive shaft (11) rotates, the pump (25) draws up lubricating oil from the oil reservoir (21) and delivers it to the oil supply passage (16). The oil supply passage (16) supplies the lubricating oil from the oil reservoir (21) to the sliding surfaces of the lower bearing (22) and the drive shaft (11), the sliding surfaces of the upper bearing (37) and the drive shaft (11), and also to the sliding surface of the boss (73) and the drive shaft (11). The oil supply passage (16) opens to the upper end surface of the drive shaft (11) and supplies lubricating oil to the upper part of the drive shaft (11).

[0042] The recess (38) of the housing (36) communicates with the oil supply passage (16) of the drive shaft (11) via the inside of the boss portion (73) of the movable scroll (70). High-pressure lubricating oil is supplied to the recess (38), so that a high pressure equivalent to the discharge pressure of the compression mechanism (35) acts upon it. The movable scroll (70) is pressed against the fixed scroll (60) by the high pressure in the recess (38).

[0043] <Balance weights> The balance weights (40) are provided to counteract the unbalanced forces generated by the rotational motion of the compression mechanism (35). In the example shown in Figure 2, the balance weights (40) are positioned above and below the rotor (32). The balance weights (40) positioned below the rotor (32) will be described below.

[0044] A balance weight (40) is provided at the axial lower end of the rotor (32). As shown in Figure 3, the balance weight (40) has a cylindrical portion (41) and a weight portion (42). The cylindrical portion (41) is arranged coaxially with the rotor (32) and the drive shaft (11).

[0045] As shown in Figure 4, the rotor (32) has an end plate (33). The end plate (33) is positioned at the axial end of the rotor (32). The balance weight (40) is fixed to the rotor (32) with the end plate (33) sandwiched between it and the rotor (32).

[0046] The weight portion (42) protrudes radially outward from the cylindrical portion (41). The weight portion (42) is provided over approximately half of the circumference of the cylindrical portion (41).

[0047] <Weight cover> As shown in Figure 4, the balance weight (40) is covered by a weight cover (50). The weight cover (50) is positioned coaxially with the rotor (32). The weight cover (50) is fixed to the rotor (32) together with the balance weight (40) by bolts (not shown).

[0048] The weight cover (50) has a bottom portion (51) and a side wall portion (52). The bottom portion (51) covers the lower end surface of the rotor (32) and the lower end surface of the balance weight (40). The side wall portion (52) is erected along the outer peripheral edge of the bottom portion (51) toward the rotor (32).

[0049] As shown in Figure 5, the side wall portion (52) covers the entire radially outward circumference of the balance weight (40). In the following description, when viewed from the axial direction of the rotor (32), the region in the circumferential direction of the weight cover (50) where the weight portion (42) of the balance weight (40) is located will be referred to as the first region, and the region excluding the first region will be referred to as the second region (see also Figure 3).

[0050] An internal space (55) is formed on the second region side inside the weight cover (50). The internal space (55) is the space enclosed by the side wall (52) and bottom surface (51) of the weight cover (50), the cylindrical portion (41) of the balance weight (40), and the end plate (33) of the rotor (32) (see Figure 4).

[0051] <Blocking component> Incidentally, as shown in Figure 4, a gap (45) is provided between the weight cover (50) that covers the balance weight (40) and the axial end of the rotor (32) to allow for assembly due to dimensional variations in the weight cover (50).

[0052] Here, as the balance weight (40) rotates, a differential pressure is generated inside the weight cover (50), causing the refrigerant in the internal space (55) of the weight cover (50) to be blown radially outward from the rotor (32) through the gap (45). This flow of refrigerant may excite the axial flow of refrigerant around the rotor (32) inside the casing (20), potentially increasing oil leakage.

[0053] Therefore, in this embodiment, it is possible to suppress the refrigerant from being blown radially outward from the rotor (32) through the gap (45) between the axial end of the rotor (32) and the weight cover (50).

[0054] Specifically, as shown in Figures 4 and 5, when viewed from the radial direction of the rotor (32), the gap (45) between the axial end of the rotor (32) and the side wall (52) is closed by the closing member (80).

[0055] In the example shown in Figure 4, the closing member (80) is composed of a part of the end plate (33) of the rotor (32). Specifically, a first closing portion (81) as the closing member (80) is integrally formed on the end plate (33). The first closing portion (81) is formed in a wall shape that extends downward along the outer peripheral edge of the end plate (33). The first closing portion (81) is arranged along the inner circumferential surface of the weight cover (50) and extends around the entire circumference of the weight cover (50). The first closing portion (81) is positioned radially inward from the side wall portion (52) of the weight cover (50).

[0056] The lower end of the first closing portion (81) extends to a position below the upper end of the side wall portion (52) of the weight cover (50). In this way, a part of the first closing portion (81) and a part of the side wall portion (52) of the weight cover (50) overlap when viewed from the radial direction of the rotor (32), thereby closing the gap (45).

[0057] As a result, the internal space (55) is partitioned by the inner circumferential surface of the side wall portion (52) of the weight cover (50), the upper surface of the bottom portion (51), the outer circumferential surface of the cylindrical portion (41) of the balance weight (40), the lower surface of the end plate (33) of the rotor (32), and the inner circumferential surface of the first closing portion (81).

[0058] -Effects of Embodiment 1- According to this embodiment, the blocking member (80) closes the gap (45) between the axial end of the rotor (32) and the side wall portion (52), thereby preventing the refrigerant from being blown radially outward from the gap (45) of the rotor (32).

[0059] According to this embodiment, by forming the closing member (80) from a part of the end plate (33), it is not necessary to provide the closing member (80) as a separate component, and the assembly man-hours can be reduced.

[0060] According to this embodiment, by positioning the closing member (80) radially inward from the weight cover (50), the closing member (80) can be positioned so as not to interfere with the stator of the motor (30).

[0061] According to this embodiment, by arranging the closing member (80) around the entire circumference of the weight cover (50), the gap (45) can be sealed around the entire circumference.

[0062] According to this embodiment, a refrigeration system (1) equipped with the compressor (10) described above can be provided.

[0063] Embodiment 2 In the following description, the same reference numerals are used for parts identical to those in Embodiment 1, and only the differences will be explained.

[0064] As shown in Figures 6 and 7, the closure member (80) is composed of a part of the end plate (33) of the rotor (32). Specifically, a second closure portion (82) as the closure member (80) is integrally formed on the end plate (33). The second closure portion (82) is formed in a wall shape that extends downward along the outer peripheral edge of the end plate (33). The second closure portion (82) is positioned in a second region of the internal space (55) along the inner circumferential surface of the weight cover (50). The second closure portion (82) is positioned radially inward from the side wall portion (52) of the weight cover (50).

[0065] The lower end of the second closing portion (82) extends to a position below the upper end of the side wall portion (52) of the weight cover (50). A part of the second closing portion (82) and a part of the side wall portion (52) of the weight cover (50) overlap when viewed from the radial direction of the rotor (32), and the gap (45) in the second region is closed by the second closing portion (82).

[0066] -Effects of Embodiment 2- According to this embodiment, the gap (45) in the first region can be closed by the eccentric portion of the balance weight (40), and the gap (45) in the second region can be closed by the closing member (80).

[0067] Embodiment 3 As shown in Figures 8 and 9, the closure member (80) is composed of a part of the balance weight (40). Specifically, the third closure portion (83), which serves as the closure member (80), is integrally formed on the cylindrical portion (41) and the weight portion (42) of the balance weight (40). The third closure portion (83) is positioned in the second region of the internal space (55). The third closure portion (83) is formed in a plate shape that covers the entire lower surface of the end plate (33) in the second region.

[0068] The lower end of the third closing portion (83) extends to a position below the upper end of the side wall portion (52) of the weight cover (50). A part of the third closing portion (83) and a part of the side wall portion (52) of the weight cover (50) overlap when viewed from the radial direction of the rotor (32), and the gap (45) in the second region is closed by the third closing portion (83).

[0069] -Effects of Embodiment 3- According to this embodiment, by forming the blocking member (80) as a part of the balance weight (40), it is not necessary to provide the blocking member (80) as a separate component, and the assembly man-hours can be reduced.

[0070] Embodiment 4 As shown in Figures 10 and 11, the closing member (80) is composed of a part of the balance weight (40). Specifically, a fourth closing portion (84), which serves as the closing member (80), is integrally formed on the weight portion (42) of the balance weight (40). The fourth closing portion (84) is formed in the shape of a wall that stands upright along the outer edge of the end plate (33). The fourth closing portion (84) is positioned in the second region of the internal space (55) along the inner surface of the weight cover (50).

[0071] The lower end of the fourth closing portion (84) extends to a position below the upper end of the side wall portion (52) of the weight cover (50). A part of the fourth closing portion (84) and a part of the side wall portion (52) of the weight cover (50) overlap when viewed from the radial direction of the rotor (32), and the gap (45) in the second region is closed by the fourth closing portion (84).

[0072] In the example shown in Figure 10, the fourth closing portion (84) is formed in the shape of a wall that stands along the outer edge of the end plate (33). Therefore, the weight of the fourth closing portion (84) is reduced compared to, for example, the case where the closing member (80) is formed in the shape of a plate that covers the entire lower surface of the end plate (33).

[0073] In this way, by increasing the weight difference between the weight portion (42) of the balance weight (40) and the weight of the fourth closing portion (84) in the second region, the effect of canceling out the unbalanced force generated by the rotational motion of the compression mechanism (35) becomes greater.

[0074] -Effects of Embodiment 4- According to this embodiment, by forming the blocking member (80) as a part of the balance weight (40), it is not necessary to provide the blocking member (80) as a separate component, and the assembly man-hours can be reduced.

[0075] Other embodiments Although embodiments and modifications have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. Furthermore, elements of the embodiments, modifications, and other embodiments described above may be combined or substituted as appropriate. In addition, the designations "first," "second," "third," etc. in the specification and claims are used to distinguish the phrases to which these designations are given, and do not limit the number or order of such phrases. [Industrial applicability]

[0076] As explained above, this disclosure is useful for compressors and refrigeration equipment. [Explanation of Symbols]

[0077] 1. Refrigeration equipment 10 Compressor 11 Drive shaft 30 motors 32 rotors 33 End plate 35 Compression mechanism 40 Balance Weights 42 Weight section 45 gaps 50 Weight Cover 52 Side wall section 80 Closure member

Claims

1. Compression mechanism (35), A drive shaft (11) that rotates the compression mechanism (35), A motor (30) having a rotor (32) that rotates the drive shaft (11), A balance weight (40) is provided at the axial end of the rotor (32), A weight cover (50) having a side wall portion (52) that covers the radially outward side of the balance weight (40), The rotor (32) is equipped with a closing member (80) that closes the gap (45) between the axial end of the rotor (32) and the side wall portion (52) when viewed from the radial direction of the rotor (32). Compressor.

2. In the compressor according to claim 1, The rotor (32) has an end plate (33) positioned at the axial end of the rotor (32), The closing member (80) is composed of a part of the end plate (33). Compressor.

3. In the compressor according to claim 1, The blocking member (80) is composed of a part of the balance weight (40). Compressor.

4. In any one of the compressors of claims 1 to 3, The closing member (80) is positioned radially inward from the weight cover (50). Compressor.

5. In any one of the compressors of claims 1 to 3, The closing member (80) is arranged around the entire circumference of the weight cover (50). Compressor.

6. In any one of the compressors of claims 1 to 3, Viewed from the axial direction of the rotor (32), the region in the circumferential direction of the weight cover (50) where the weight portion (42) of the balance weight (40) is located is defined as the first region, and the region excluding the first region is defined as the second region. The closing member (80) is positioned in the second region. Compressor.

7. The present invention comprises a compressor (10) according to any one of claims 1 to 3. Refrigeration equipment.

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