Compressor and refrigerator

Abstract

To prevent flame generated inside a terminal box in a compressor from extending outside.SOLUTION: A compressor (10) comprises: a compressor mechanism (30); a casing (20) which stores the compressor; a terminal body (110) which holds a terminal rod (100) connected to wiring (K) leading to equipment (J) in the casing and is fixed to an external wall (28) of the casing; and a terminal box (120) which is fixed to the external wall of the casing and stores the terminal rod held by the terminal body. The terminal body is protruded in a direction (E) away from the casing and includes: a bottom wall section (121) fixed to the external wall of the casing; a hole section (122), on the bottom wall section, through which the terminal body passes; and a cylinder section (126) which is extended, in a direction away from the casing, from a periphery (122a) of the hole section. The terminal body is inserted into the cylinder section.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] In the compressor disclosed in Patent Document 1, a terminal box for protecting terminals is provided on the peripheral wall of the casing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 61-032761 Summary of the Invention [Problem to be solved by the invention]

[0004] This type of compressor includes a compression mechanism, a casing, a terminal rod, a terminal body, and a terminal box. The casing houses the compression mechanism. The terminal rod is connected to wiring to devices inside the casing. The terminal body holds the terminal rod and is fixed to the outer wall of the casing. The terminal box is fixed to the outer wall of the casing and houses the terminal rod held by the terminal body.

[0005] If there is an abnormality during compressor operation, a flame may occur inside the terminal box that houses the terminal rod. The flame is promoted by oxygen. Since there is a large amount of oxygen in the atmosphere outside the terminal box, it is necessary to prevent the flame that occurs inside the terminal box from escaping outside the terminal box.

[0006] An object of the present disclosure is to prevent a flame occurring inside a terminal box of a compressor from escaping outside the terminal box. [Means for solving the problem]

[0007] A first aspect of the present disclosure is directed to a compressor (10). The compressor (10) includes a compression mechanism (30), a casing (20) that houses the compression mechanism (30), a terminal body (110) that holds a terminal rod (100) to which wiring (K) is connected to a device (J) in the casing (20) and is fixed to an outer wall (28) of the casing (20), and a terminal box (120) that houses the terminal rod (100) that is fixed to the outer wall (28) of the casing (20) and is held by the terminal body (110). The terminal box (120) includes a bottom wall portion (121) fixed to the outer wall (28) of the casing (20), a hole portion (122) formed in the bottom wall portion (121) through which the terminal body (110) passes, and a tubular portion (126) extending from a periphery (122a) of the hole portion (122) toward the direction (E) away from the casing (20), and the terminal body (110) is inserted into the tubular portion (126).

[0008] In the compressor (10) according to the first aspect, a flame generated in the terminal box (120) passes through the gap between the terminal body (110) and the cylindrical portion (126) of the terminal box (120) to escape to the outside of the terminal box (120). The flame can be extinguished before passing through the gap.

[0009] According to the compressor (10) of the first aspect, a flame occurring inside the terminal box (120) can be prevented from escaping to the outside of the terminal box (120).

[0010] A second aspect of the present disclosure is directed to the compressor (10) according to the first aspect. In the compressor (10), an insertion length (L1) of the terminal body (110) inserted into the cylindrical portion (126) is 6 mm or more.

[0011] The compressor (10) according to the second aspect is more advantageous in extinguishing the flame before it passes through the gap between the terminal body (110) and the cylindrical portion (126) of the terminal box (120).

[0012] A third aspect of the present disclosure is directed to the compressor (10) according to the first or second aspect. In this compressor (10), a gap (T) between the terminal body (110) and the cylindrical portion (126) is equal to or smaller than 0.4 mm.

[0013] The compressor (10) according to the third aspect is more advantageous in extinguishing the flame before it passes through the gap (T) between the terminal body (110) and the cylindrical portion (126) of the terminal box (120).

[0014] A fourth aspect of the present disclosure is directed to the compressor (10) according to any one of the first to third aspects. In the compressor (10), the tubular portion (126) has a cylindrical shape that extends straight, and the terminal body (110) extends straight and has a circular cross section.

[0015] According to the compressor (10) of the fourth aspect, the terminal body (110) can be easily inserted into the cylindrical portion (126) of the terminal box (120).

[0016] A fifth aspect of the present disclosure is directed to the compressor (10) according to any one of the first to fourth aspects. The compressor (10) includes an electric motor (70) that drives the compression mechanism (30), the casing (20) houses the compression mechanism (30) and the electric motor (70), and a wiring (K) to the electric motor (70) is connected to the terminal rod (100).

[0017] In the compressor (10) of the fifth aspect, a large current is likely to flow through the terminal rod (100) connected to the electric motor (70) via the wiring (K). Therefore, it is beneficial to take measures against a flame that may occur around the terminal rod (100) through which a large current is likely to flow.

[0018] A sixth aspect of the present disclosure is directed to the compressor (10) according to any one of the first to fifth aspects. In this compressor (10), the outer wall (28) is arc-shaped.

[0019] In the compressor (10) of this embodiment, a gap is likely to be formed between the outer wall (28) of the casing (20) and the bottom wall portion (121) of the terminal box (120). This makes it possible to more effectively utilize the advantage of inserting the terminal body (110) into the cylindrical portion (126) of the terminal box (120).

[0020] A seventh aspect of the present disclosure is directed to a refrigeration system (1). The refrigeration system (1) includes a compressor (10) according to any one of the first to sixth aspects. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 shows a refrigeration device (1) according to a first embodiment. [Diagram 2] FIG. 2 shows a front cross-sectional view of the compressor (10) according to the first embodiment. [Diagram 3] FIG. 3 is a front cross-sectional view showing the outer wall (28) of the casing (20), the terminal rod (100), the terminal body (110), and the terminal box (120) according to the first embodiment. [Figure 4] FIG. 4 is a perspective view of a terminal rod (100) and a terminal body (110) according to the first embodiment. [Diagram 5] FIG. 5 is a plan view showing the outer wall (28) of the casing (20) and the terminal box (120) according to the first embodiment. [Figure 6] FIG. 6 is a side view showing the terminal rod (100), the terminal body (110), and the terminal box (120) according to the first embodiment. [Figure 7] FIG. 7 is a view corresponding to FIG. 3 according to the second embodiment. [Figure 8] FIG. 8 is a view corresponding to FIG. 3 according to the third embodiment. [Figure 9] FIG. 9 is a view corresponding to FIG. 3 according to the prior art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical idea of ​​the present disclosure. Since each drawing is intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.

[0023] First Embodiment (Refrigeration equipment) A compressor (10) according to a first embodiment will be described. The compressor (10) is applied to a refrigeration system (1). FIG. 1 shows the refrigeration system (1). The refrigeration system (1) includes a refrigerant circuit (1a) in which a refrigerant circulates as a working fluid. The refrigerant circuit (1a) of the refrigeration system (1) includes a compressor (10), a condenser (heat radiator) (2), a pressure reduction mechanism (expansion mechanism) (3), and an evaporator (4). The pressure reduction mechanism (3) is, for example, an expansion valve or a capillary tube. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle. The refrigeration system (1) is applied to, for example, an air conditioner or a chiller.

[0024] (Compressor) 2 shows a front cross-sectional view of the compressor (10). In this example, the compressor (10) is a scroll compressor. The compressor (10) includes a casing (20), a compression mechanism (30), a drive shaft (40), a housing (50), a balance weight (60), an electric motor (70), a lower bearing member (80), an oil pump (90), a terminal rod (100), a terminal body (110), and a terminal box (120).

[0025] Hereinafter, the direction in which the axis of the drive shaft (40) extends is referred to as the axial direction and is designated as (Z). The direction perpendicular to the axis of the drive shaft (40) is referred to as the radial direction and is designated as (R). The side farther from the axis of the drive shaft (40) in the radial direction is referred to as the radial outer circumferential side or outward and is designated as (Ro). The side closer to the axis of the drive shaft (40) in the radial direction is referred to as the radial inner circumferential side or inward and is designated as (Ri). The direction of rotation of the drive shaft (40) is referred to as the circumferential direction and is designated as (θ).

[0026] The axial direction of the drive shaft (40) extends in the vertical direction. The vertical direction is indicated by (Z), just like the axial direction. The upper side in the axial direction (vertical direction) is simply referred to as the upper side and indicated by (Za). The lower side in the axial direction (vertical direction) is simply referred to as the lower side and indicated by (Zb).

[0027] The compressor (10) is disposed vertically. A compression mechanism (30), a housing (50), a balance weight (60), an electric motor (70), a lower bearing member (80), and an oil pump (90) are housed in the casing (20) in this order from top to bottom. The drive shaft (40) extends axially (vertically) within the casing (20).

[0028] As will be described in detail later, the terminal body (110) and the terminal box (120) are fixed to the outer wall (28) of the casing (20). The terminal rod (100) is held by the terminal body (110).

[0029] (Casing) The casing (20) accommodates a compression mechanism (30), a drive shaft (40), a housing (50), a balance weight (60), an electric motor (70), a lower bearing member (80), and an oil pump (90).

[0030] The casing (20) is a cylindrical sealed container that extends vertically in the axial direction (vertical direction). The casing (20) is made of metal. The casing (20) includes a body portion (21), an upper end plate portion (22), a lower end plate portion (23), and legs (24). The body portion (21) is cylindrical with both ends in the axial direction (vertical direction) open. The upper end plate portion (22) closes the upper end of the body portion (21). The lower end plate portion (23) closes the lower end of the body portion (21). The legs (24) are provided below the lower end plate portion (23) and support the casing (20) on a foundation.

[0031] A suction pipe (25) is connected to the casing (20). The suction pipe (25) axially passes through the upper end plate portion (22) of the casing (20). A discharge pipe (26) is connected to the casing (20). The discharge pipe (26) radially passes through the body portion (21) of the casing (20).

[0032] An oil reservoir (27) is provided at the bottom of the casing (20). The oil reservoir (27) stores lubricating oil (L). The lubricating oil (L) serves to lubricate the sliding parts of the compressor (10).

[0033] The outer wall (28) of the casing (20) will be described later.

[0034] (Compression mechanism) The compression mechanism (30) is provided in the casing (20). The compression mechanism (30) compresses a refrigerant (G) (e.g., a refrigerant gas) serving as a working fluid. In this example, the refrigerant (G) is propane. Propane is highly flammable and easily combustible. The compression mechanism (30) has a fixed scroll (31) and a movable scroll (35). The movable scroll (35) is meshed with the fixed scroll (31).

[0035] The fixed scroll (31) includes a fixed end plate portion (32), a fixed side wrap (33), and an outer circumferential wall portion (34). The fixed side end plate portion (32) is disk-shaped. The fixed side wrap (33) is a spiral wall that describes an involute curve and protrudes downward from the lower surface of the fixed side end plate portion (32). The outer circumferential wall portion (34) is formed so as to surround the fixed side wrap (33) from the outer circumferential side, and protrudes downward from the lower surface of the fixed side end plate portion (32).

[0036] The movable scroll (35) is also called an orbiting scroll. The movable scroll (35) is disposed below the fixed scroll (31). The movable scroll (35) includes a movable end plate portion (36), a movable wrap (37), and a boss portion (38). The movable end plate portion (36) is disk-shaped. The movable wrap (37) is a spiral wall that describes an involute curve and protrudes upward from the upper surface of the movable end plate portion (36). The boss portion (38) is cylindrical and protrudes downward from the center of the lower surface of the movable end plate portion (36). A bearing (38a) is fitted into the inner periphery of the boss portion (38).

[0037] In the compression mechanism (30), a movable wrap (37) of the movable scroll (35) is meshed with a fixed wrap (33) of the fixed scroll (31). A compression chamber (C) is formed in a region surrounded by the fixed end plate portion (32) and the fixed wrap (33) of the fixed scroll (31) and the movable end plate portion (36) and the movable wrap (37) of the movable scroll (35). The refrigerant (G) is compressed in the compression chamber (C). The compression chamber (C) is in communication with the suction pipe (25).

[0038] A discharge port (32a) is formed in the fixed end plate portion (32) of the fixed scroll (31). The discharge port (32a) axially passes through the center of the fixed end plate portion (32) and communicates with the compression chamber (C). A discharge chamber (A) is formed in a region between the fixed scroll (31) and the upper end plate portion (22) of the casing (20). The discharge chamber (A) communicates with the discharge port (32a).

[0039] (Drive shaft) The drive shaft (40) extends in the axial direction (vertical direction) within the casing (20). The drive shaft (40) has a main shaft portion (41) and an eccentric shaft portion (42). The eccentric shaft portion (42) is provided at the upper end of the main shaft portion (41). The outer diameter of the eccentric shaft portion (42) is smaller than the outer diameter of the main shaft portion (41). The axis (42a) of the eccentric shaft portion (42) is eccentric with respect to the axis (41a) of the main shaft portion (41) by a predetermined distance.

[0040] The eccentric shaft portion (42) of the drive shaft (40) is rotatably supported by the boss portion (38) of the movable scroll (35) through a bearing (38a).

[0041] (housing) The housing (50) has a generally cylindrical shape extending in the axial direction (vertical direction). The housing (50) is disposed within the casing (20) below the movable scroll (35) and above the balance weight (60). The drive shaft (40) is inserted into the inner periphery of the housing (50). The outer diameter of the upper portion of the housing (50) is larger than the outer diameter of the lower portion of the housing (50). The outer peripheral surface of the upper portion of the housing (50) is fixed to the inner peripheral surface of the body portion (21) of the casing (20).

[0042] The inner diameter of the upper portion of the housing (50) is larger than the inner diameter of the lower portion of the housing (50). A crank chamber (51) is formed on the inner periphery of the upper portion of the housing (50) by a downwardly recessed portion. The crank chamber (51) accommodates the boss portion (38) of the movable scroll (35).

[0043] A main bearing hole (52) is formed on the inner periphery of the lower part of the housing (50). The main bearing hole (52) penetrates the lower part of the housing (50) in the axial direction (vertical direction) and communicates with the crank chamber (51). A bearing (52a) is fitted into the inner periphery of the main bearing hole (52). The main shaft portion (41) of the drive shaft (40) is rotatably supported in the main bearing hole (52) of the housing (50) via the bearing (52a).

[0044] A discharge space (B) is formed in the casing (20) below the housing (50). The discharge space (B) communicates with the discharge pipe (26).

[0045] (Balance weight) The balance weight (60) serves to cancel out an unbalanced force generated by the orbital motion of the movable scroll (35) of the compression mechanism (30). The balance weight (60) is provided in the casing (20), below the housing (50) and above the electric motor (70). The balance weight (60) is provided on the main shaft portion (41) of the drive shaft (40). The balance weight (60) rotates integrally with the drive shaft (40). The balance weight (60) is composed of a weight portion (61), a non-weight portion (62), and a cover (63).

[0046] The weight portion (61) is a portion that extends over approximately half the circumference of the balance weight (60) in the circumferential direction. The weight portion (61) protrudes toward the outer periphery of the drive shaft (40). The weight portion (61) protrudes from the drive shaft (40) on the side opposite to the side where the eccentric shaft portion (42) is eccentric with respect to the main shaft portion (41).

[0047] The cover (63) covers the entire balance weight (60) including the weight portion (61) and the non-weight portion (62).

[0048] (Electric motor) The electric motor (70) is also called a motor. The electric motor (70) is provided in the casing (20) below the balance weight (60) and above the lower bearing member (80). The electric motor (70) is a type of device (J) in the casing (20). The electric motor (70) drives the compression mechanism (30) by rotating the drive shaft (40). The electric motor (70) includes a rotor (71), a stator (72), a coil (73), and an insulator (74).

[0049] The rotor (71) is also called a rotor. The rotor (71) is made of metal. The rotor (71) is cylindrical and extends in the axial direction (vertical direction). The rotor (71) is coupled to the main shaft portion (41) of the drive shaft (40). The main shaft portion (41) of the drive shaft (40) is inserted and fixed to the inner periphery of the rotor (71). The rotor (71) rotates integrally with the drive shaft (40).

[0050] The rotor (71) is provided with a plurality of inner refrigerant passages (75). The inner refrigerant passages (75) penetrate the wall of the rotor (71) in the axial direction (vertical direction). The inner refrigerant passages (75) are arranged side by side at predetermined intervals along the circumferential direction of the rotor (71).

[0051] The stator (72) is also called a stator. The stator (72) is made of metal. The stator (72) is cylindrical and extends in the axial direction (vertical direction). The stator (72) is fixed to the inner circumferential surface of the body portion (21) of the casing (20). The stator (72) is disposed so as to surround the rotor (71) from the outer circumferential side. There is a predetermined gap between the stator (72) and the rotor (71) in the radial direction. The rotor (71) is rotatably inserted into the inner circumferential side of the stator (72).

[0052] A plurality of core cuts (72a) are provided on the outer periphery of the stator (72). The core cuts (72a) are grooves extending in the axial direction (vertical direction). The plurality of core cuts (72a) are arranged at intervals along the circumferential direction of the stator (72). An outer refrigerant passage (76) is provided between the core cuts (72a) on the outer periphery of the stator (72) and the inner circumferential surface of the body portion (21) of the casing (20).

[0053] The coil (73) is fixed to the stator (72). There are a plurality of coils (73) (three or more) corresponding to three phases, namely, U phase, V phase, and W phase. The coils (73) are arranged side by side at intervals along the circumferential direction of the stator (72). An inter-coil refrigerant passage (77) is provided between the coils (73) adjacent to each other in the circumferential direction.

[0054] The coil (73) includes an upper coil end that protrudes upward beyond the upper end of the stator (72) and a lower coil end that protrudes downward beyond the lower end of the stator (72).

[0055] A lead wire (73a) serving as wiring (K) is drawn from the coil (73) of each phase. There are three lead wires (73a) corresponding to the three phases, namely, U phase, V phase, and W phase. The lead wires (73a) are drawn to above the motor (70).

[0056] The insulator (74) is made of resin. There are two insulators (74). The insulators (74) are disposed above and below the stator (72). The insulators (74) insulate the stator (72) from the coils (73).

[0057] (Lower bearing member) The lower bearing member (80) has a generally cylindrical shape extending in the axial direction (vertical direction). The lower bearing member (80) is provided in the casing (20) between the electric motor (70) and the oil reservoir (27) (the lower bottom portion of the casing (20)). The lower bearing member (80) includes a cylindrical portion (81), a protruding portion (82), and an oil separation plate (83).

[0058] The cylindrical portion (81) is cylindrical. The cylindrical portion (81) accommodates the main shaft portion (41) of the drive shaft (40). A bearing (81a) is fitted into the inner periphery of the cylindrical portion (81). The main shaft portion (41) of the drive shaft (40) is rotatably supported by the cylindrical portion (81) of the lower bearing member (80) via the bearing (81a).

[0059] The protrusion (82) protrudes outward from the cylindrical portion (81) and is fixed to the inner circumferential surface of the body portion (21) of the casing (20).

[0060] The oil separation plate (83) is fixed to the cylindrical portion (81) and extends in the radial and circumferential directions. The oil separation plate (83) faces the oil reservoir (27). The refrigerant (G) contains lubricating oil (L). When the refrigerant (G) hits the oil separation plate (83), the lubricating oil (L) is separated from the refrigerant (G), and the separated lubricating oil (L) drops into the oil reservoir (27).

[0061] (Oil pump) The oil pump (90) includes a pump portion (91) and a nozzle portion (92). The pump portion (91) is provided at the lower end of the main shaft portion (41) of the drive shaft (40). The pump portion (91) rotates integrally with the drive shaft (40). The nozzle portion (92) is fixed to the lower end of the cylindrical portion (81) of the lower bearing member (80). The nozzle portion (92) is immersed in the lubricating oil (L) stored in the oil reservoir (27).

[0062] The oil pump (90) draws up the lubricating oil (L) from the oil reservoir (27). The lubricating oil (L) is supplied to each sliding part of the compressor (10) through an oil passage (not shown) provided inside the drive shaft (40).

[0063] (Compressor operation) The operation of the compressor (10) will be described. When the electric motor (70) is driven, the drive shaft (40) rotates, thereby driving the movable scroll (35) of the compression mechanism (30). The movable scroll (35) revolves around the axis (41a) of the main shaft portion (41) of the drive shaft (40) while its rotation is restricted.

[0064] The low-pressure refrigerant (G) is drawn from the suction pipe (25) into the compression chamber (C) of the compression mechanism (30) in the casing (20) and compressed to become high-pressure refrigerant (G). The high-pressure refrigerant (G) is discharged from the compression chamber (C) through the discharge port (32a) of the fixed scroll (31) to the discharge chamber (A). The high-pressure refrigerant (G) flows from the discharge chamber (A) through a discharge passage (not shown) formed in the fixed scroll (31) and the housing (50) to a discharge space (B) located below the housing (50). The high-pressure refrigerant (G) is discharged from the discharge space (B) through the discharge pipe (26) to the outside of the casing (20) (e.g., the condenser (2) of the refrigerant circuit (1a)).

[0065] Although detailed description is omitted, a portion of the refrigerant (G) circulates around the electric motor (70) through the inner refrigerant passage (75), the outer refrigerant passage (76), and the inter-coil refrigerant passage (77).

[0066] (Casing outer wall, terminal rod, terminal body, terminal box) Hereinafter, the relationship between the outer wall (28) of the casing (20), the terminal rod (100), the terminal body (110), and the terminal box (120) will be described with reference to FIGS.

[0067] Fig. 3 shows a front cross-sectional view of the outer wall (28) of the casing (20), the terminal rod (100), the terminal body (110), and the terminal box (120). Fig. 4 shows a perspective view of the terminal rod (100) and the terminal body (110). Fig. 5 shows a plan view of the outer wall (28) of the casing (20) and the terminal box (120) as viewed from above, as indicated by an arrow V. Fig. 6 shows a side view of the terminal rod (100), the terminal body (110), and the terminal box (120) as viewed from the side, as indicated by an arrow VI.

[0068] (Outer wall of casing) As shown in Fig. 3, the body (21) of the casing (20) includes an outer wall (28). The outer wall (28) separates the inside and outside of the casing (20). The outer wall (28) extends in the axial direction (vertical direction) and circumferential direction of the drive shaft (40). The inner surface of the outer wall (28) faces the inside of the casing (20). The outer surface of the outer wall (28) faces the outside of the casing (20). The outer wall (28) is made of metal.

[0069] The outer wall (28) of the casing (20) is arc-shaped when viewed in the axial direction (vertical direction) so as to correspond to the cylindrical shape of the body (21) of the casing (20) (see FIG. 5). The outer wall (28) is provided with a seat (28a). The seat (28a) is flat.

[0070] A first hole (29) is formed in the seat portion (28a) of the outer wall (28). The first hole (29) has a circular shape. The first hole (29) penetrates the outer wall (28). The first hole (29) communicates between the inside and the outside of the casing (20).

[0071] The first hole (29) is disposed axially (vertically) near the upper end of the electric motor (70) (specifically, slightly above the upper coil end of the coil (73)).

[0072] (Terminal Rod) As shown in Fig. 3, the terminal rod (100) is rod-shaped. The terminal rod (100) extends straight. The terminal rod (100) is made of metal.

[0073] The terminal rod (100) is disposed in the first hole (29) of the outer wall (28). The terminal rod (100) passes through the first hole (29) of the outer wall (28). One end (101) of the terminal rod (100) is located inside the casing (20) relative to the outer wall (28). The other end (102) of the terminal rod (100) is located outside the casing (20) relative to the outer wall (28).

[0074] A lead wire (73a) serving as wiring (K) to the electric motor (70) in the casing (20) is connected to one end (101) of the terminal rod (100). The other end (102) of the terminal rod (100) is connected to an external power source (not shown) via a power supply cable (not shown).

[0075] There are three terminal rods (100) corresponding to the three phases, namely, U phase, V phase, and W phase. The terminal rod (100) of each phase corresponds to the lead wire (73a) of each phase.

[0076] (Terminal body) As shown in Fig. 3, the terminal body (110) has a cylindrical shape with a bottom. The terminal body (110) is hollow. The terminal body (110) is made of metal. The terminal body (110) is press-formed. The terminal body (110) is disposed in the first hole portion (29) of the outer wall (28). The terminal body (110) includes a first tube portion (111), a locking portion (112), and a cover portion (113).

[0077] The first tubular portion (111) of the terminal body (110) is cylindrical. The first tubular portion (111) of the terminal body (110) extends straight. The first tubular portion (111) of the terminal body (110) has a circular cross section when viewed in the extension direction of the first tubular portion (111) (see FIG. 6).

[0078] The first cylindrical portion (111) passes through the first hole (29) of the outer wall (28). One end of the first cylindrical portion (111) is located inside the casing (20) relative to the outer wall (28). The other end of the first cylindrical portion (111) is located outside the casing (20) relative to the outer wall (28). The outer diameter of the first cylindrical portion (111) is slightly smaller than the inner diameter of the first hole (29) of the outer wall (28).

[0079] The locking portion (112) is provided at one end of the first cylindrical portion (111). The locking portion (112) is located inside the outer wall (28) of the casing (20). The locking portion (112) is formed by widening the diameter of one end of the first cylindrical portion (111). The outer diameter of the locking portion (112) is larger than the outer diameter of the first cylindrical portion (111). The outer diameter of the locking portion (112) is larger than the inner diameter of the first hole portion (29) of the outer wall (28).

[0080] The lid portion (113) closes an opening on the other end side of the first cylindrical portion (111). The lid portion (113) is located outside the outer wall (28) of the casing (20).

[0081] The terminal body (110) is fixed to the outer wall (28) of the casing (20). The first cylindrical portion (111) of the terminal body (110) passes through the first hole portion (29) of the outer wall (28). The first cylindrical portion (111) is fitted into the first hole portion (29). The locking portion (112) of the terminal body (110) comes into contact with and is hooked onto the periphery of the first hole portion (29) on the inner surface of the outer wall (28).

[0082] The first cylindrical portion (111) of the terminal body (110) protrudes in a separation direction (E) away from the outer wall (28) of the casing (20). The first cylindrical portion (111) of the terminal body (110) extends straight in the separation direction (E). In this example, the separation direction (E) coincides with the radial outer periphery of the drive shaft (40). The separation direction (E) is also the other end side of the extension direction of the first cylindrical portion (111) of the terminal body (110). The separation direction (E) is also the other end side of the extension direction of the terminal rod (100).

[0083] As shown in Fig. 4, the terminal body (110) holds the terminal rod (100). The terminal rod (100) is housed in a first cylindrical portion (111) of the terminal body (110). The terminal rod (100) passes through a hole (not shown) formed in a lid portion (113) of the terminal body (110) in the separation direction (E). The other end (102) of the terminal rod (100) is located closer to the separation direction (E) than the lid portion (113) of the terminal body (110).

[0084] The terminal rod (100) and the terminal body (110) are electrically insulated from each other by an insulating material (130). The insulating material (130) is made of glass and is interposed between the terminal rod (100) and the cover portion (113) of the terminal body (110).

[0085] (Terminal Box) As shown in Fig. 3, the terminal box (120) has a box shape. The terminal box (120) has a rectangular parallelepiped shape. The terminal box (120) is made of metal. The terminal box (120) is located outside the outer wall (28) of the casing (20). The terminal box (120) is fixed to the outer wall (28) of the casing (20).

[0086] The terminal box 120 protects the terminal rod 100 accommodated in an accommodating space 120a, which will be described later. The terminal box 120 is also used during maintenance.

[0087] The terminal box (120) includes a bottom wall portion (121), a second hole portion (122), a side wall portion (123), a cover portion (124), a cable gland (125), and a second cylindrical portion (126).

[0088] 3 and 5, the bottom wall portion (121) extends in the axial direction (vertical direction) and circumferential direction of the drive shaft (40) so as to correspond to the outer wall (28) of the casing (20). The bottom wall portion (121) has an arc shape when viewed in the axial direction (vertical direction) so as to correspond to the arc shape of the outer wall (28) of the casing (20) (the cylindrical shape of the body portion (21) of the casing (20)). The bottom wall portion (121) is in the shape of a rectangular plate bent into an arc shape.

[0089] The bottom wall portion (121) is provided with a seat portion (121a). The seat portion (121a) is flat. The seat portion (121a) of the bottom wall portion (121) corresponds to the seat portion (28a) of the outer wall (28). The bottom wall portion (121) (specifically, the seat portion (121a) of the bottom wall portion (121)) has a plate thickness (t).

[0090] The bottom wall portion (121) is fixed to an outer wall (28) of the casing (20). As shown in Fig. 5, since both the outer wall (28) and the bottom wall portion (121) have an arc shape, a gap (H) is likely to be formed between the outer wall (28) and the bottom wall portion (121).

[0091] The second hole (122) is formed in the seat portion (121a) of the bottom wall portion (121). The second hole (122) has a circular shape. The second hole (122) penetrates the bottom wall portion (121). The second hole (122) of the bottom wall portion (121) overlaps with the first hole (29) of the outer wall (28).

[0092] The first cylindrical portion (111) of the terminal body (110) passes through a second hole (122) provided in the bottom wall portion (121) of the terminal box (120). The first cylindrical portion (111) of the terminal body (110) protrudes in the separation direction (E) beyond the bottom wall portion (121) of the terminal box (120) by at least an amount greater than the plate thickness (t) of the bottom wall portion (121). The lid portion (113) of the terminal body (110) is located closer to the separation direction (E) than the bottom wall portion (121) of the terminal box (120). The terminal rod (100) held by the terminal body (110) is located closer to the separation direction (E) than the bottom wall portion (121) of the terminal box (120).

[0093] The side wall portion (123) extends (rises) in the separation direction (E) from the peripheral edge of the rectangular plate-shaped bottom wall portion (121). The side wall portion (123) is rectangular tubular. The bottom wall portion (121) closes an open end of the rectangular tubular side wall portion (123) on the side opposite to the separation direction (E) (the side closer to the outer wall (28) of the casing (20)).

[0094] The lid portion (124) is in the shape of a rectangular plate and closes the open end of the rectangular cylindrical side wall portion (123) facing in the separating direction (E). A seal member (124a) is interposed between the side wall portion (123) and the lid portion (124).

[0095] An accommodation space (120a) is defined in an area (interior of the terminal box (120)) surrounded by the bottom wall portion (121), the side wall portion (123), and the lid portion (124) of the terminal box (120). The bottom wall portion (121), the side wall portion (123), and the lid portion (124) separate the accommodation space (120a) inside the terminal box (120) from an external space (120b) outside the terminal box (120).

[0096] The storage space (120a) in the terminal box (120) has an internal volume (V). The smaller the internal volume (V), the smaller the amount of air (containing oxygen) present in the storage space (120a) in the terminal box (120). The larger the internal volume (V), the greater the amount of air present in the storage space (120a) in the terminal box (120).

[0097] The terminal box (120) accommodates, in an accommodation space (120a), the terminal rod (100) held by the terminal body (110). In detail, a portion of the terminal rod (100) that protrudes in the separation direction (E) beyond the cover portion (113) of the terminal body (110) is accommodated in the accommodation space (120a) in the terminal box (120).

[0098] The cable gland (125) has a substantially cylindrical shape and passes through a hole (not shown) formed in the side wall portion (123). A seal member (not shown) is interposed between the hole in the side wall portion (123) and the cable gland (125).

[0099] A power supply cable (not shown) connected to the other end (102) of the terminal rod (100) accommodated in the accommodation space (120a) in the terminal box (120) passes through a cable gland (125) and is connected to an external power source (not shown) arranged in the external space (120b) outside the terminal box (120).

[0100] As shown in Fig. 3, the second tube portion (126) extends from a peripheral edge (122a) of the second hole portion (122) formed in the bottom wall portion (121) toward the separation direction (E) away from the outer wall (28) of the casing (20). The second tube portion (126) is cylindrical. The second tube portion (126) extends straight in the separation direction (E). The second tube portion (126) extends in the separation direction (E) by a total length (L0). The second tube portion (126) is disposed in the accommodation space (120a) in the terminal box (120).

[0101] The first cylindrical portion (111) of the terminal body (110) is inserted into the second cylindrical portion (126) of the terminal box (120). In detail, the first cylindrical portion (111) of the terminal body (110) is fitted into the second cylindrical portion (126) of the terminal box (120).

[0102] The first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) are fitted together. In detail, the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) are in a clearance fit relationship.

[0103] In this example, the tip portion (the connection portion with the cover portion (113)) of the first tubular portion (111) of the terminal body (110) on the separation direction (E) side protrudes slightly toward the separation direction (E) relative to the tip portion of the second tubular portion (126) of the terminal box (120) on the separation direction (E) side.

[0104] 6, a gap (T) is formed between the outer peripheral surface of the first cylindrical portion (111) of the terminal body (110) and the inner peripheral surface of the second cylindrical portion (126) of the terminal box (120). The gap (T) between the outer peripheral surface of the first cylindrical portion (111) of the terminal body (110) and the inner peripheral surface of the second cylindrical portion (126) of the terminal box (120) is set to a predetermined value or less based on design criteria for safety gaps shown in Table 1, which will be described later.

[0105] The gap (T) is the sum of the first gap (T1) at any point between the first tubular portion (111) and the second tubular portion (126) and the second gap (T2) 180° opposite the first gap (T1) (a position that is rotationally symmetrical about the center of each tubular portion).

[0106] The insertion length (L1) of the first cylindrical portion (111) of the terminal body (110) inserted into the second cylindrical portion (126) of the terminal box (120) is set to a predetermined value or more based on the design criteria for safety clearance shown in Table 1 described later. The insertion length (L1) is the length of the portion where the clearance (T) is kept below a predetermined value. The insertion length (L1) is also called the fitting length.

[0107] The first tubular portion (111) of the terminal body (110) has a corner at the tip (connection portion with the cover portion (113)) on the separation direction (E) side, which is formed with an arc-shaped radius (111a). In the region of the radius (111a), the gap (T) between the first tubular portion (111) and the second tubular portion (126) may not be equal to or smaller than a predetermined value. The insertion length (L1) is preferably set so as not to include the radius (111a).

[0108] In this example, the insertion length (L1) of the first cylindrical portion (111) of the terminal body (110) inserted into the second cylindrical portion (126) of the terminal box (120) is shorter than the total length (L0) by the amount excluding the radiused corner (111a).

[0109] (Safety gap) If an abnormality occurs during operation of the compressor (10), a flame (F) may occur in the accommodation space (120a) of the terminal box (120) that accommodates the terminal rod (100). The flame (F) is promoted by oxygen. Since a large amount of oxygen is present in the atmosphere in the external space (120b) outside the terminal box (120), it is necessary to prevent the flame (F) occurring in the accommodation space (120a) of the terminal box (120) from escaping to the external space (120b) outside the terminal box (120).

[0110] The flame (F) is generated, for example, in the following manner. When a large current flows through the terminal rod (100) due to an abnormality during operation of the compressor (10), the insulating material (130) between the terminal rod (100) and the terminal body (110) melts, and the terminal rod (100) comes off the terminal body (110). The terminal rod (100) that has come off the terminal body (110) may be blown off by the internal pressure of the compressor (10) and come into contact with the metal casing (20). At this time, a spark is generated between the terminal rod (100) and the casing (20).

[0111] If the refrigerant (G) used in the compressor (10) is flammable, the refrigerant (G) leaking out of the casing (20) from the portion where the terminal rod (100) is removed (the first hole (29) in the outer wall (28) of the casing (20)) mixes with the air (containing oxygen) present outside the casing (20) to form a flammable atmosphere. If a spark occurs in this state, it may ignite outside the casing (20) and cause a flame (F).

[0112] Therefore, the terminal box (120) is fixed to the outer wall (28) of the casing (20) so as to cover the first hole portion (29) of the outer wall (28) of the casing (20). A flame (F) occurring outside the casing (20) is confined to the accommodation space (120a) in the terminal box (120) (the flame (F) occurs in the accommodation space (120a) in the terminal box (120)).

[0113] As described above, since a large amount of oxygen is present in the atmosphere in the external space (120b) outside the terminal box (120), it is necessary to prevent the flame (F) generated in the storage space (120a) inside the terminal box (120) from escaping into the external space (120b) outside the terminal box (120).

[0114] As shown in FIG. 3, a flame (F) generated in the storage space (120a) within the terminal box (120) inevitably passes through the gap (T) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) to escape to the external space (120b) outside the terminal box (120).

[0115] The idea behind a safe gap is that the cooling and suffocating effects of a flame (F) as it passes through a gap (T) cause the flame (F) to disappear before it passes through the gap (T).

[0116] Table 1 shows the design criteria for safety gaps.

[0117] [Table 1]

[0118] A safe gap is the maximum gap (T) that can extinguish a flame (F) before it passes through the gap (T). The gap (T) should be set to the value shown in [Table 1] or less.

[0119] The maximum gap (T) (safety gap) is determined by the type of refrigerant (G), the insertion length (L1) and the internal volume (V). The unit of the maximum gap (T) (safety gap) is [mm]. The unit of the insertion length (L1) is [mm]. The unit of the internal volume (V) is [cm 2 ].

[0120] [Table 1] shows an example where the refrigerant (G) type is propane, but it can also be applied to other types of refrigerants. Since propane is highly flammable, the clearance (T) value shown in [Table 1] is set strictly (small). When the refrigerant (G) type is other than propane, the clearance (T) value may be more lenient (larger) than the value shown in [Table 1].

[0121] As shown in Table 1, the maximum gap (T) (safety gap) is smaller as the insertion length (L1) is smaller and larger as the insertion length (L1) is larger. The maximum gap (T) (safety gap) is larger as the internal volume (V) is smaller and smaller as the internal volume (V) is larger.

[0122] As shown in Table 1, the maximum gap (T) (safety gap) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) is preferably equal to or less than 0.4 mm.

[0123] As shown in Table 1, the insertion length (L1) of the first cylindrical portion (111) of the terminal body (110) inserted into the second cylindrical portion (126) of the terminal box (120) is preferably 6 mm or more.

[0124] (Action and effect) 3, in the compressor (10) according to this embodiment, a flame (F) generated in the accommodation space (120a) in the terminal box (120) passes through a gap (T) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) to escape to the external space (120b) outside the terminal box (120). The flame (F) is extinguished before passing through the gap (T).

[0125] According to the compressor (10) of this embodiment, it is possible to prevent the flame (F) generated in the accommodation space (120a) in the terminal box (120) from escaping to the external space (120b) outside the terminal box (120).

[0126] By making the insertion length (L1) of the first tubular portion (111) of the terminal body (110) inserted into the second tubular portion (126) of the terminal box (120) 6 mm or more, it becomes more advantageous in extinguishing the flame (F) before it passes through the gap (T).

[0127] By setting the maximum gap (T) (safety gap) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) to 0.4 mm or less, it becomes more advantageous for the flame (F) to be extinguished before it passes through the gap (T).

[0128] Since the first tubular portion (111) of the terminal body (110) extends straight and has a circular cross-section (is cylindrical), and the second tubular portion (126) of the terminal box (120) is also cylindrical and extends straight, it becomes easy to insert the first tubular portion (111) of the terminal body (110) into the second tubular portion (126) of the terminal box (120).

[0129] A lead wire (73a) is connected to the terminal rod (100) as wiring (K) to the electric motor (70) in the casing (20). A large current is likely to flow through the terminal rod (100) connected to the electric motor (70) via the lead wire (73a). It is useful to take measures against flames (F) that may occur around the terminal rod (100) where a large current is likely to flow.

[0130] 5, since the outer wall (28) of the casing (20) has an arc shape (the body portion (21) of the casing (20) has a cylindrical shape), a gap (H) is likely to be formed between the outer wall (28) of the casing (20) and the bottom wall portion (121) of the terminal box (120). More specifically, a large gap (H) is inevitably formed between the outer wall (28) and the bottom wall portion (121).

[0131] It is difficult to keep this gap (H) below the safety gap. If you try to keep this gap (H) below the safety gap, you will have to do complicated work such as caulking or filling the gap (H) with sealing material.

[0132] FIG. 9 is a view according to the prior art, equivalent to FIG. 3. In a compressor (10') according to the prior art, a terminal body (110') does not protrude in a direction away from an outer wall (28) of a casing (20). In a compressor (10') according to the prior art, a terminal box (120') does not have a second cylindrical portion (126). Therefore, it is necessary to keep the gap (H) between the outer wall (28) of the casing (20) and a bottom wall portion (121') of the terminal box (120') below a safe gap. Therefore, in the compressor (10') according to the prior art, it is necessary to caulk or fill the gap (H) with a sealing material in order to keep the gap (H) below a safe gap.

[0133] According to the compressor (10) of this embodiment, the gap (T) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) is kept below a safe gap. According to the compressor (10) of this embodiment, it is not necessary to perform such a troublesome operation as caulking or filling the gap (H) between the outer wall (28) of the casing (20) and the bottom wall portion (121) of the terminal box (120) with a sealing material as in the compressor (10') of the conventional technology.

[0134] According to the compressor (10) of this embodiment, a safety gap can be more easily ensured as compared with the compressor (10') of the conventional technology.

[0135] According to the compressor (10) of this embodiment, a gap (H) is easily formed between the arc-shaped outer wall (28) of the casing (20) and the bottom wall portion (121) of the terminal box (120), so that the benefits of inserting the first cylindrical portion (111) of the terminal body (110) into the second cylindrical portion (126) of the terminal box (120) can be more effectively enjoyed.

[0136] <Second embodiment> A compressor (10) according to a second embodiment will be described. Fig. 7 is a view according to the second embodiment, which corresponds to Fig. 3. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof may be omitted.

[0137] In this embodiment, the terminal body 110 is a solid cylindrical (rod-shaped) terminal body that extends straight and has a circular cross section when viewed in the extension direction of the terminal body 110.

[0138] The other configurations are similar to those of the first embodiment.

[0139] <Third embodiment> A compressor (10) according to a third embodiment will be described. Fig. 8 is a view corresponding to Fig. 3 according to the third embodiment. Fig. 8 is simplified more than Fig. 3. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof may be omitted.

[0140] In this embodiment, the terminal body (110) is tapered and decreases in diameter in the separating direction (E). The second cylindrical portion (126) of the terminal box (120) is tapered and decreases in diameter in the separating direction (E).

[0141] The other configurations are similar to those of the first and second embodiments.

[0142] <Other embodiments> The maximum gap (T) (safety gap) and the insertion length (L1) do not necessarily have to be set according to [Table 1]. For example, if the type of refrigerant (G) is not highly flammable propane, these values ​​may be set more leniently than the values ​​shown in [Table 1]. The maximum gap (T) (safety gap) may be greater than 0.4 mm. The insertion length (L1) may be less than 6 mm.

[0143] The type of refrigerant (G) may be other than propane. The refrigerant (G) may be any of highly flammable, combustible, slightly flammable, and non-flammable. The refrigerant (G) may be, for example, ammonia (R717), methane (R50), ethane (R170), butane (R600), isobutane (R600a), R152a, R32, R1234yf, R1234ze, R410A, R134a, and R407C, other than propane (R290). The refrigerant (G) may be a mixed refrigerant containing two or more of these refrigerants. The refrigerant (G) may be other than the above-mentioned refrigerants.

[0144] In the third embodiment, the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) may be tapered and may increase in diameter in the separating direction (E).

[0145] The second tubular portion (126) of the terminal box (120) may have a shape other than a cylindrical shape, for example a rectangular tubular shape. The terminal body (110) may have a rectangular cross section.

[0146] The tip end portion of the second cylindrical portion (126) of the terminal box (120) in the separation direction (E) may protrude beyond the tip end portion of the terminal body (110) in the separation direction (E). Also, the two may be flush with each other.

[0147] The outer wall 28 of the casing 20 may be flat rather than arcuate.

[0148] In the above embodiment, the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) are in a clearance fit relationship, but the present invention is not limited to this and may be an interference fit relationship or an intermediate fit relationship. The gap (T) may be zero (it is preferable that the gap (T) is zero).

[0149] In the above embodiment, the electric motor 70 is illustrated as an example of the device J in the casing 20 to which the wiring K is connected to the terminal rod 100. However, the device J in the casing 20 may be, for example, another device such as a measuring device or a magnetic bearing.

[0150] The compressor (10) may be placed horizontally. The axial direction (Z) of the drive shaft (40) may extend horizontally.

[0151] The compressor (10) is not limited to a scroll compressor, but may be another type of compressor, such as a rotary compressor, a screw compressor, or a turbo compressor.

[0152] The compressor (10) does not have to be applied to the refrigeration system (1) and may be used, for example, as a standalone unit.

[0153] Although the embodiments have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims. Elements of the above-mentioned embodiments, modifications, and other embodiments may be appropriately combined or substituted. [Explanation of symbols]

[0154] E Separation direction (direction) K wiring V internal volume L1 Insertion length T Gap F flame 1 Refrigeration equipment 10 Compressor 20 Casing 21 Torso 28 Exterior Wall 29 1st hole 30 Compression Mechanism 40 Drive shaft 50 Housing 60 Balance weight 70 Electric motor 73 Coil 73a lead wire 80 Lower bearing member 90 Oil Pump 100 Terminal Rod 110 Terminal body 111 First cylinder part 120 Terminal Box 120a Storage space 120b External space 121 Bottom wall 122 2nd hole 122a Periphery 126 Second cylinder part

Claims

1. A compression mechanism (30); a casing (20) that houses the compression mechanism (30); a terminal body (110) that holds a terminal rod (100) to which a wiring (K) is connected to a device (J) in the casing (20) and is fixed to an outer wall (28) of the casing (20); a terminal box (120) that is fixed to the outer wall (28) of the casing (20) and that houses the terminal rod (100) that is held by the terminal body (110), The terminal body (110) protrudes in a direction (E) away from the casing (20), The terminal box (120) is a bottom wall portion (121) fixed to the outer wall (28) of the casing (20); a hole (122) formed in the bottom wall portion (121) and through which the terminal body (110) passes; a cylindrical portion (126) extending from a periphery (122a) of the hole portion (122) in a direction (E) away from the casing (20), The terminal body (110) is inserted into the cylindrical portion (126). Compressor.

2. An insertion length (L1) of the terminal body (110) inserted into the cylindrical portion (126) is 6 mm or more. The compressor according to claim 1.

3. A gap (T) between the terminal body (110) and the cylindrical portion (126) is 0.4 mm or less. The compressor according to claim 1 or 2.

4. The tube portion (126) has a cylindrical shape that extends straight, The terminal body (110) extends straight and has a circular cross section. The compressor according to claim 1 or 2.

5. an electric motor (70) that drives the compression mechanism (30); the casing (20) houses the compression mechanism (30) and the electric motor (70), A wiring (K) to the electric motor (70) is connected to the terminal rod (100). The compressor according to claim 1 or 2.

6. The outer wall (28) is arc-shaped. The compressor according to claim 1 or 2.

7. The compressor (10) according to claim 1 or 2, Refrigeration equipment.

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