JP4539972B2 - Hermetic scroll compressor - Google Patents

Description

  The present invention relates to a hermetic scroll compressor, and is particularly suitable for a hermetic scroll compressor used in a helium compressor for a cryopump apparatus in an ultra-high vacuum field using helium gas as a working gas.

  In the conventional hermetic scroll compressor, as shown in FIG. 29 and FIG. 30, the motor protector 91 is tied to the surface of the motor coil end portion 3e and fixed to the portion where the flow of the compressed gas is stagnated with a string. (Prior art 1). The motor protector 91 of the prior art 1 is hermetically sealed with an insulating member 110 formed of a relatively hard insulating paper having a thickness of about 0.2 mm, and is tied to the outer surface of the motor coil end portion with a string 186. It was fixed at. The insulating member 110 is composed of a cylindrical hard insulating paper whose both sides are longer than the motor protector 91 for fixing by the tie strap 186. It is fixed to the part.

  Patent documents relating to the motor protector of the hermetic scroll compressor include those disclosed in Japanese Patent Application Laid-Open Nos. 7-189954 (Patent Document 1) and 2001-304147 (Patent Document 2).

  In the hermetic scroll compressor of Patent Document 1, the motor is disposed in the space where the refrigerant gas is sucked, and is located near the opening of the gas suction pipe and near the low pressure side outlet of the pressure relief valve. A motor protector is disposed in the end coil portion (prior art 2).

  Further, in the hermetic scroll compressor of Patent Document 2, when the temperature inside the hermetic container becomes higher than usual, the compressor is swirled by the temperature detection of the motor protector that can detect the temperature and current provided in the motor. It stops before breakage or bearing seizure occurs (Prior Art 3).

JP-A-7-189954 JP 2001-304147 A

  In the prior art 1 mentioned above, since the motor protector is arrange | positioned in the part in which the flow of compressed gas has stagnated, the cooling effect by a working gas flow was not fully acquired. For this reason, there existed a problem that motor protector ambient temperature became high and the lifetime of motor protector itself became short.

  Moreover, in the prior art 1, since the motor protector 91 is sealed with the insulating member 110, it becomes difficult to radiate the heat of the motor protector 91 to the outside of the insulating member 110, and the temperature of the entire motor protector 91 rises. . In addition, since the insulating member 110 performs a heat insulating action, the cooling action to the motor protector 91 due to the refrigerant gas flow flowing around the insulating member 110 cannot be sufficiently obtained, and the temperature rise of the motor protector 91 is further increased. For this reason, the lifetime of the motor protector 91 itself is shortened, and the maximum continuous current value that is the operating current of the motor protector 91 is reduced. When the maximum continuous current value is lowered, the operating range of the compressor is limited, and the usability is lowered. In particular, in a scroll compressor for helium, the amount of helium gas to circulate is reduced to about 1/20 of that for an air conditioning compressor having the same capacity and the same stroke volume. If it is sealed, the cooling effect on the motor protector 91 by helium gas can hardly be expected, and the lifetime of the motor protector 91 itself and the maximum continuous current value of the motor protector 91 are particularly decreased. The performance / function of the product is greatly reduced.

  Moreover, in the prior art 1, since the hard insulating member 110 in a sealed state is fixed with the tie strap 186, as shown in FIGS. 29 and 30, protrusions are formed on both upper sides of the relatively hard insulating member 110. 110a is generated. In addition, a protruding portion 110b from which a part of the insulating member 110 protrudes from the outside dimension of the coil end (Dk dimension) also occurs in the circumferential direction of the coil end portion 3e. For this reason, variations occur in the molding dimensions at the time of assembling the motor coil end portion 3e and the motor protector 91, leading to defective dimensions or poor molding workability, resulting in poor productivity in mass production. There is.

  Moreover, the scroll compressor of the prior art 2 is one in which a motor is disposed in the space of the sucked-in low-pressure refrigerant gas, and a motor is disposed in the flow path of the compressed gas discharged into the sealed container. Is not disclosed.

  Moreover, the scroll compressor of the prior art 3 was not disclosed regarding the specific installation position with respect to the working gas flow of a motor protector.

  An object of the present invention is to provide a highly reliable hermetic scroll compressor that has a simple structure, can extend the life of a motor protector, and can reliably protect the motor.

In order to achieve the above object, according to a first aspect of the present invention, helium gas is used as a working gas , and a scroll compressor unit and an electric motor unit are housed in a sealed container. The fixed scroll that erects the spiral wrap and the orbiting scroll that erects the spiral wrap on the end plate are engaged with each other with the wraps inside, and is engaged with an eccentric mechanism that connects the orbiting scroll to the rotating shaft. The orbiting scroll is orbited with respect to the fixed scroll without rotating, and the fixed scroll is provided with a discharge port that opens at a central portion and a suction port that opens at an outer peripheral portion, and the working gas is supplied from the suction port. The suction gas is moved around a compression chamber formed by the fixed scroll and the orbiting scroll to reduce the volume and compress the working gas. The dynamic gas configured to discharge the container chamber from the discharge port, the hermetic scroll compressor discharges the discharge working gas in the vessel outside through the discharge pipe, oil injection for cooling the working gas A motor protector that directly cuts the motor circuit that connects the pipe to the oil injection port provided on the end plate of the fixed scroll and energizes the motor coil due to an abnormal increase in the motor current and an abnormal increase in the working gas temperature,
The motor protector is attached to a motor coil end portion, which is a mixed working gas region of mist-like oil and working gas discharged from the discharge port , through a thin-film insulating member having an upper surface opened, and the motor protector is attached. The motor protector is placed on the thin-film insulating member so that a predetermined insulating distance is secured between the upper portion of the motor and the airtight container so as to be exposed to the mixed working gas region of the mist oil and working gas. It is.

A second aspect of the present invention, the helium gas used as the working gas, and a scroll compressor unit and an electric motor unit and stored vertically disposed across the frame in a sealed container, the rotary shaft penetrating through the frame Connecting the electric motor part and the scroll compressor part, and dividing the inside of the sealed container by the frame into a discharge chamber in which the scroll compressor part is arranged and a motor chamber in which the electric motor part is arranged, The motor chamber is divided into an upper motor chamber and a lower motor chamber in the electric motor section, and a passage is provided in the outer edge portion of the frame to connect the discharge chamber and the upper motor chamber. wherein a plurality of passages for the communication with the lower motor chamber and the upper motor chamber provided, provided the discharge tube so as to communicate with the upper motor chamber located on the opposite side to the outer edge of the frame to the closed container, the scan The roll compressor unit engages a fixed scroll that erects a spiral wrap on the end plate and a orbiting scroll that erects the spiral wrap on the end plate with the wraps facing each other, and the orbiting scroll is connected to the rotating shaft. Engaging with an eccentric mechanism to be installed, causing the orbiting scroll to orbit with respect to the fixed scroll without rotating, and providing the fixed scroll with a discharge port that opens at the center and a suction port that opens at the outer periphery, The working gas is sucked from the suction port, moved around a compression chamber formed by the fixed scroll and the orbiting scroll, the volume is reduced, the working gas is compressed, and the compressed working gas is discharged to the discharge port. configured to discharge more the discharge chamber, it leads to the discharge working gas in the upper motor chamber through the passage of the outer edge portion of the frame, on the The working gas that has flowed into the motor chamber is divided into a flow that reaches the discharge pipe through the upper motor chamber, and a flow that reaches the discharge pipe through the passage of the outer edge of the electric motor section and the lower motor chamber. In the hermetic scroll compressor configured to discharge outside through the discharge pipe, an oil injection pipe for cooling the working gas is connected to an oil injection port provided on the end plate of the fixed scroll, the motor circuit for energizing the motor coil includes a motor protector to direct cut by abnormal increase in abnormal increase the working gas temperature of the motor current, mixed operation with mist oil and working gas discharged said motor protector from said discharge port With a string tied tightly through a thin-film insulating member whose upper surface is open to the motor coil end that faces the upper motor chamber that becomes the gas region And attaching the motor protector to the strap so that the upper portion of the motor protector is exposed to the mixed working gas region of the mist oil and working gas while ensuring a predetermined insulation distance between the upper portion of the motor protector and the sealed container. And the motor protector is placed on the thin film insulating member .

  According to the present invention, it is possible to obtain a highly reliable hermetic scroll compressor with a simple structure that can extend the life of the motor protector and reliably protect the motor.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. In addition, it can be made more effective by combining each Example suitably as needed.

  First, a hermetic scroll compressor according to a first embodiment of the present invention will be described with reference to FIGS.

  A helium compressor will be described as an example of the hermetic scroll compressor according to the first embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing an embodiment of an oil-filled sealed helium scroll compressor of the present invention in a vertical structure. 2 is a sectional view taken along the line CC in FIG. 1, and FIG. 3 is a sectional view taken along the line DD in FIG.

In FIG. 3, a motor coil is connected to the motor coil end portion 3c on the downstream side of the flow of the mixture of mist oil and refrigerant gas discharged from the discharge port 10 due to an abnormal increase in motor current and abnormal increase in gas temperature. integrating the electric motor unit 3 is attached directly at the cord (not shown) tied through a thin film sleeve 110 to the motor protector 91 in an electrically insulating means and the motor protector 9 1 having a motor circuit direct-cut function allowed to energization It has a structure. The motor protector 91 is installed in the vicinity of the gas inlet 20 a of the discharge pipe 20.

Furthermore, the motor coil an arcuate gas flow path portion 25c is formed by the inner wall surface 2 m of the outer peripheral surface of the motor stator 3a and the closed container 1 in contact with the flow of the working gas reaches the discharge pipe 20 from the gas flow path portion 25c A motor protector 91 is installed at the upper end 3c of the end. Since the motor protector 91 is exposed to the flow of the mixture in the horizontal direction and the gas flow mainly rising the arc-shaped gas flow path portion 25c, the speed of the surrounding mixture is increased. The cooling effect on the motor protector 91 is enhanced. In addition, 85 is a lead wire for main power supplies, and 86, 87, and 88 are lead wires for neutral points.

  FIG. 4 is a plan view of the fixed scroll 5, and FIG. 5 is a longitudinal sectional view of the fixed scroll 5. One oil injection port 22 can inject cooling oil into both compression chambers 8 and is provided at the center position of the wrap groove. The hole diameter d0 is set to a value larger than the wrap thickness t to prevent an oil hammer phenomenon during oil injection. 6 and 7 are a plan view and a longitudinal sectional view of the orbiting scroll 6.

In this embodiment, the working gas is helium gas, and as shown in FIG. 1, an oil injection pipe 31 for cooling the working helium gas passes through the upper lid 2 a of the sealed container 1 and the end plate portion 5 a of the fixed scroll 5. It is connected to the oil injection port 22 provided in. The opening portion of the oil injection port 22 is opened facing the tooth tip surface of the wrap 6 b of the orbiting scroll 6. The scroll compression mechanism part is accommodated in the upper part which becomes the suction piping 17 side in the airtight container 1, and the electric motor part 3 is accommodated in the lower part. The sealed container 1 is divided into a discharge chamber 1a and a motor chamber 1b with the frame 7 interposed therebetween. The scroll compression mechanism unit forms a compression chamber (sealed space) 8 by meshing the fixed scroll 5 and the orbiting scroll 6 with each other.

  As shown in FIG. 4, the fixed scroll 5 includes a disc-shaped end plate 5a and an involute curve upright or a wrap 5b formed in an approximate curve thereto, and a discharge port 10 at the center thereof. A suction port 15 (15a, 15b) is provided on the outer peripheral portion. As shown in FIGS. 6 and 7, the orbiting scroll 6 is also formed on a disc-shaped end plate 6a, a wrap 6b that stands upright and is formed in the same shape as the fixed scroll wrap, and an anti-wrap surface of the end plate. It consists of a boss 6c.

In FIG. 1, the frame 7 forms a bearing portion 40 that is a main bearing at a central portion, and the rotating shaft 14 is supported on the bearing portion 40. The eccentric shaft 14a at the tip of the rotating shaft is inserted into the boss portion 6c so as to be capable of turning. In addition, the fixed scroll 5 is fixed to the frame 7 by a plurality of bolts 81. The orbiting scroll 6 is supported by an Oldham mechanism 38 comprising an Oldham ring and Oldham key. The orbiting scroll 6 is formed so as to orbit with respect to the fixed scroll 5 without rotating. An electric motor shaft 14 b is integrally connected to the rotating shaft 14, and the electric motor shaft 14 b is directly connected to the electric motor unit 3.

A suction pipe 17 is connected to the suction port 15 of the fixed scroll 5 through the upper lid 2 a of the sealed container 1, and the discharge chamber 1 a in which the discharge port 10 is opened is a passage 18 a at the outer edge of the fixed scroll 5 and the frame 7. , 18b communicates with the motor chamber 1b (1b1, 1b2). The motor chamber 1b communicates with a discharge pipe 20 that penetrates the casing portion 2b at the center of the sealed container. The discharge pipe 20 is installed at a position almost opposite to the positions of the passages 18a and 18b. The positional relationship between the two 18 and 20 is such that the mixture of the gas and the injection oil that has passed through the passage 18 flows downward into the passage 25b in the vertical direction of the passage 18, the stator upper surface 3f, and the surrounding area. Due to the collision with the coil end portion 3e, it is divided into two hands in the horizontal direction and divided into two directions (strictly, three directions) along the flow path along the inner wall of the container. Motor chamber 1b1 forms an arcuate path 25 as a gas flow path portion between the inner wall surface 2 m side of the motor stator 3a and the casing portion 2b (25a, 25b, 25c, 25d). In the passage 25, mainly gas 25b, 25a, and 25d flow downward in the gas and the injection oil, and only the passage 25c becomes upward flow in the working gas upward. The gap 26 of the motor air gap also serves as a gas passage, and the space 1b1 and the space 1b2 communicate with each other through the gap 26.

  Such a flow of the gas and oil mixture in the motor chambers 1b1 and 1b2 inside the container enables direct cooling to the motor with relatively low-temperature injection oil of 60 ° C to 70 ° C. In the space, oil in the gas is separated from the gas and flows downward while cooling the surrounding members 3a and 2b via the passages 25a, 25b and 25d. The scroll compressor for air conditioning and refrigeration applications does not have an oil injection structure, so the cooling effect of this oil cannot be obtained.

An O-ring 53 that seals the high pressure portion and the low pressure portion is provided between the suction pipe 17 and the fixed scroll 5. Further, a check valve means 13 is provided in the suction pipe 17, and the check valve 13 prevents reverse rotation of the rotary shaft 14 when the compressor is stopped, and the lubricating oil in the sealed container flows out to the low pressure side. This is to prevent this from happening. 70 is a three-phase power source.

  A space 36 (hereinafter referred to as a back pressure chamber) surrounded by the scroll compressor unit 2 and the frame 7 is formed on the back surface of the end plate 6a of the orbiting scroll 6. An intermediate pressure Pb between the suction pressure and the discharge pressure is introduced into the back pressure chamber 36 through the pores 6 e and 6 f formed in the end plate 6 a of the orbiting scroll 6, and presses the orbiting scroll 6 against the fixed scroll 5. Axial force is given.

The lubricating oil 23 is stored at the bottom of the sealed container 1, and the lubricating oil 23 is sucked up to the oil suction pipe 27 by the differential pressure between the high pressure in the sealed container and the intermediate pressure Pb in the back pressure chamber 36. After that, the oil flows through the rotary shaft 14 and is supplied to the auxiliary bearing 39 and the main bearing 40 through the slewing bearing 32 and the lateral hole 151. The oil supplied to the bearing portions 40 and 32 is injected into the compression chamber 8 of the scroll wrap through the holes 6e and 6f through the back pressure chamber 36, mixed with the compressed gas, and then discharged into the discharge chamber 1a together with helium gas. Is done. In the bottom portion of the sealed container 1, the oil extraction pipe 30 it is provided to take out the lubricating oil 2 3 bottom to vessel out. An oil injection pipe 31 for injecting oil into the compression chamber 8 in the middle of compression of the scroll compression mechanism is provided on the upper lid portion 2a of the sealed container 1.

The oiling system of the present embodiment will be described with reference to FIG. Lubricating oil 23 stored at the bottom of the sealed container 1 flows into the oil take-out pipe 30 due to the differential pressure between the pressure in the sealed container 1 (discharge pressure Pd) and the pressure in the compression chamber 8 (pressure below the discharge pressure). The oil flows into the oil take-out pipe 30 from 30a. Oil flowing into the oil extraction pipe 30 is led through an outer oil pipe 51 to the oil strainer 56 and the oil cooler 33, after being suitably cooled Here, the oil injection pipe 31 and port 22 via the Aburahai tube Then, the pressure is introduced using the differential pressure and injected into the compression chamber 8. Reference numeral 271 denotes an oil flow rate adjusting valve.

  The oil injected into the compression chamber 8 in this manner serves to cool the working gas in the compression chamber 8 and lubricate sliding portions such as the scroll wrap tip. Then, this oil is compressed together with the working gas, and then discharged from the discharge port 10 to the discharge chamber 1a, and is separated from the working gas in the electric motor chamber 1b as described above, and flows down through the passages 25a, 25b, 25d and sealed. It collects at the bottom of the container 1.

FIG. 8 is a motor circuit diagram of this embodiment. The motor circuit of this embodiment is a circuit in which an internal motor protector 91 is provided at the neutral point 3k of the star connection, and the motor protector 91 is provided with two contact portions 91p (current interrupting portions) for three phases. ing. With this configuration, a motor protector 91 having a direct cut function for a motor circuit that energizes a motor coil due to an abnormal increase in motor current and an abnormal increase in gas temperature is shown. For this reason, the contact part is always closed. It opens at the time of abnormality. Reference numerals 91a , 91b and 91c denote motor protector pin portions . 3 e is a motor coil unit. Reference numeral 70a denotes a hermetic terminal.

  The operating current of the motor protector can be increased by lowering the ambient temperature Tp of the motor protector 91 and thus lowering the discharge gas temperature Td flowing out from the discharge pipe 20. Usually, Td <Tp, and the conventional machine (for air conditioning use) has a temperature difference of Tp−Td = 20 to 30 ° C. under an overload condition. In the scroll compressor for helium of the present embodiment, the temperature difference can be reduced to Tp−Td = 10 to 15 ° C. due to the oil injection effect. As a result, the motor protection function of the motor protector 91 can be improved. Further, the oil injection cooling amount is adjusted by the oil flow rate adjusting valve 271 (see FIG. 1) so that Tp−Td = 10 to 15 ° C.

The operation of this embodiment will be described with reference to FIG. FIG. 9 is a characteristic diagram showing the relationship between the operating current passing through the motor protector 91 and the ambient temperature around the motor protector 91. In FIG. 9, in the case of the atmospheric temperature Tp, the operating current value is k1 in the case of the conventional machine, whereas in this embodiment, the k2 value is high (the cooling effect by the cooling oil of the oil injection mechanism is high for helium applications). In the case of a scroll compressor for helium in which a synergistic cooling effect is obtained by the gas velocity, the operating current value is high. This is because the motor protector 91 according to the present embodiment is arranged at an optimum position, and the overload condition that becomes the upper limit of the operating range of the compressor can be increased by the function of greatly increasing the operating current. For example, since the discharge pressure can be secured higher than that of the conventional machine, an effect that the operation range can be set wider can be obtained. Oil injection makes it possible to lower the ambient temperature of the motor protector 91 as compared to that for air conditioning. When an overcurrent flows, the temperature of the motor protector contact portion (for example, 91p in FIG. 8 ) decreases, and the number of contact ON / OFF times The effect that the total number of times increases is obtained. As the structure of the contact portion, there is a bimetal structure (not shown). That is, the effect of improving the life of the motor protector 91 can be obtained. The motor protector 91 is an automatic return type in which, when the ambient temperature returns to normal, the contact is closed and the current flows again through the circuit due to the bimetal structure.

FIGS. 10 and 11 show modifications in which a recess 3g is provided in the motor coil end portion 3c, and a motor protector 91 is disposed and attached in close contact with the recess 3g via an insulating member 110. FIG. By adopting the structure of this modified example, the contact area between the motor protector 91 and the coil portion 3c is increased, and it is easy to detect an abnormal temperature rise of the motor, and the followability of the motor protector 91 can be improved and protected. Function will be improved.

  In this embodiment, in order to overcome the problems of the prior art 1, particularly in helium applications, in a helium compressor having an oil injection function structure effective for motor cooling as well as cooling of working gas, The compressor structure is configured to promote cooling of the electric motor unit 3 and the motor protector 91 by a mixed flow of a mist-like oil and gas mixture. Further, in order to improve the motor protection function of the motor protector 91 and improve the followability of the motor protector 91, the discharge gas is located in the vicinity of the discharge pipe 20 on the downstream side of the discharge gas in the sealed container where the gas temperature is highest. It will be installed in the flow. That is, by adopting these configurations, the cooling of the motor protector 91 itself by the mixture of the gas flow and the oil mist is promoted, the maximum operating current value of the motor protector 91 is increased, the overcurrent blocking unit, Thus, a hermetic scroll compressor that extends the life of the contact portion of the motor protector 91 can be realized.

Moreover, the following specific effect is acquired by setting it as the structure of the Example mentioned above.
(1) By arranging the motor protector on the downstream side of the discharge gas in a gas flow or a mixed flow of a mist-like oil and gas mixture, the motor protector itself and the peripheral portion of the motor protector Cooling can be promoted. As a result, the maximum operating current value of the motor protector can be increased, and the life of the motor protector contact portion serving as an overcurrent interrupting portion can be extended. This effect / action becomes remarkable in a compressor for helium that can cool a motor by oil injection.
(2) According to the above item (1), the motor protector can be reduced in size and weight. As a result, the cost can be reduced.
(3) Since the life of the motor protector can be extended, the life and reliability of the compressor as a whole can be greatly improved.
(4) The overload condition of the compressor can be widened by arranging the motor protector at the optimum position. For example, since the discharge pressure can be ensured higher than before, an effect that the operation range can be set wider can be obtained.
(5) Especially in the case of a helium scroll compressor, the cooling effect by oil injection can further reduce the gas ambient temperature around the motor protector to around 20 ° C to 30 ° C. Even if the functionality is equivalent to the same capacity horsepower class of the machine, a smaller motor protector can be used, and the cost can be reduced. Although the helium compressor is mainly used in a cryopump apparatus used in a semiconductor manufacturing apparatus, the reliability of the motor protector is improved, so that the motor protection is ensured and the helium compressor unit is also protected. The effect is also extended to the extension of the maintenance time of the helium compressor unit, and the maintenance cost can be reduced.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 12 is a longitudinal sectional view of a hermetic scroll compressor according to a second embodiment of the present invention, and FIG. 13 is a sectional view taken along line EE of FIG. The second embodiment is different from the first embodiment in the following points, and is basically the same as the first embodiment in other points.

  In the second embodiment, the discharge pipe 20 is extended to the vicinity of the frame 7 incorporating the main bearing 40 inside the container, and the motor protector 91 is installed in the vicinity of the gas inlet 20a of the discharge pipe 20. . By adopting this structure, the gas inflow rate into the discharge pipe 20 is increased, and the motor protector 91 is exposed to the atmosphere. The improvement of the cooling effect | action to the motor protector 91 by the mixture of the gas flow and the oil mist which the gas velocity increased is aimed at.

  By adopting the configuration of the second embodiment, the main flow velocity of the gas in the motor protector 91 can be set to about 1 to 3 m / sec, and the cooling effect can be further improved. In addition, the motor protector of the prior art 1 has a flow velocity of about 0.3 m / sec or less.

Next, a third embodiment of the present invention will be described with reference to FIGS. 1-4 and 9. Figure 1 4 is a longitudinal sectional view of hermetic scroll compressor of the third embodiment of the present invention.

  The third embodiment is different from the first embodiment in that it is a scroll compressor for refrigeration / air conditioning that does not require the oil injection mechanism sections 30 and 31, and the other points including the motor circuit are the first. This is basically the same as one embodiment. Even in the scroll compressor for air conditioning that does not have the oil injection mechanism sections 30 and 31 as in the third embodiment, the same operation and effect as the first embodiment can be obtained in the same configuration as the first embodiment. It is. That is, in FIG. 9, when the ambient temperature is Tp, the operating current value of the conventional machine is k1 ′, whereas in the third embodiment, the k2 ′ value (high in the case of the air conditioning compressor embodiment) is high. The operating current value and the operating current value are increased due to the cooling effect by the gas velocity.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS. 15 is a transverse sectional view (corresponding to the DD cross section of FIG. 1) of the hermetic scroll compressor of the fourth embodiment of the present invention, FIG. 16 is a longitudinal sectional view of the main part of the hermetic scroll compressor, FIG. Is a longitudinal sectional view of the motor protector of the hermetic scroll compressor, FIG. 18 is a plan view of the motor protector, FIG. 19 is a side view of the motor protector, and FIG. 20 is a modification of the hermetic scroll compressor. FIG. 2 is a transverse sectional view (corresponding to a DD section in FIG. 1). The fourth embodiment is different from the first embodiment in the following points, and is basically the same as the first embodiment in other points.

  In the fourth embodiment, as shown in FIGS. 15 and 16, the motor coil end 4c on the downstream side of the flow of the mixture of the mist-like oil discharged from the discharge port 10 and the refrigerant gas is supplied to the motor current. A motor circuit that energizes the motor coil due to an abnormal increase and an abnormal increase in gas temperature is obtained by binding a motor protector 91 having a direct cut function through a cylindrical and thin-film insulating member 110 serving as an electrical insulating member and coiling it with a string 186 The motor unit 3 and the motor protector 91 are integrated with each other by being directly attached to the end portion. The electrically insulating member 110 has a structure in which a protector body is wrapped by winding a relatively soft and heat-resistant polyester synthetic resin material (sheet material) in a cylindrical shape. Since it is relatively soft, it has a function as a cushioning material.

  The mounting structure of the motor protector 91 will be described with reference to FIGS.

  The length L3 of the cylindrical thin film insulating member 110 is approximately L3 = L1 × 1.1 with respect to the longitudinal dimension L1 of the motor protector 91. Due to this dimensional relationship, part of the insulating paper is eliminated from the outer dimension (Dk dimension) of the coil end in the circumferential direction of the coil end portion 3c at the time of fixing the protector, and the protrusions 110d and 110e Occurrence is eliminated, and the degree of variation in molding dimensions during assembly of the coil end portion and the protector is reduced. In addition, the workability of attaching the strap 186 is improved, and the productivity during mass production of the protector attachment workability can be improved. In the conventional case, the insulating member 110 is very long, generally around L3 = L1 × 2.5.

  As shown in FIGS. 18 and 19, both end surfaces of the insulating member 110 form openings 110 a and 110 b, and are in an open state in communication with the motor chamber 1 b side after assembly. In addition, 91a, 91b, 91c are power supply connection parts (pin parts) on the protector side, and 86, 87, 88 are neutral point lead wires.

  As shown in FIGS. 15 and 16, the motor protector 91 is installed near the gas inlet 20 a of the discharge pipe 20. Furthermore, an arc-shaped gas flow path portion 25c is formed by the outer peripheral portion of the motor stator 3a and the inner wall surface 2m of the hermetic container 1, and the motor is in contact with the flow of the working gas from the gas flow path portion 25c to the discharge pipe 20. A motor protector 91 is installed at the upper end 3c of the coil end. Since the motor protector 91 is exposed to the flow of the mixture in the horizontal direction and the gas flow mainly rising in the arc-shaped gas flow path portion 25c and the flow of the oil component oil-injected, The speed of the gas and oil mixture increases, and the cooling action of the mixture on the motor protector 91 increases. By adopting such a configuration, as described above, the speed of the main flow of gas can be set to around 1 to 3 m / sec, and the cooling effect of this embodiment can be sufficiently obtained. As shown in FIG. 20, the openings 110c and 110d of the insulating member 110 are provided even when the mounting position of the motor protector 91 is positioned at the intermediate portion between the discharge pipe side 3c and the passage side 3e of the motor coil end. Thus, the cooling effect of the motor protector 91 is obtained.

  Next, a fifth embodiment of the present invention will be described with reference to FIGS. 21 is a plan view of a motor protector portion of a hermetic scroll compressor according to a fifth embodiment of the present invention, and FIG. 22 is a partial cross-sectional side view of FIG. The fifth embodiment is different from the fourth embodiment in the following points, and the other points are basically the same as those in the fourth embodiment.

  The fifth embodiment is an embodiment in which the motor protector 91 is attached with a string 186 through a thin film-like insulating member 110, and notches 110e are provided at both ends of the insulating member 110. After assembling, the cutout portion 110e communicates with the motor chamber 1b where the surface of the side surface portion of the motor protector 91 is a mixed region of the surrounding working gas and mist oil. Conventionally, heat is trapped inside the insulating member 110, but heat generated in the protector portion can be dissipated from the notch portion 110e. The notch 110e forms an opening after the protector is assembled.

  Further, both side end portions 110f and 110g having a large notch portion 110e are members for binding the thin-film insulating member 110 and the motor protector 91 to the coil end side with a string 186. As described above, when the insulating member 110 having the notch structure and the hole structure is assembled into the coil end portion 3c, the conventional excess protruding portion is absorbed by the notch portion, etc. The defective dimension will be eliminated.

  Next, a sixth embodiment of the present invention will be described with reference to FIGS. FIG. 23 is a longitudinal sectional view of a motor protector used in a hermetic scroll compressor according to a sixth embodiment of the present invention, FIG. 24 is a plan view of a motor protector portion of the hermetic scroll compressor, and FIG. 25 is a part of FIG. It is a cross-sectional side view. The sixth embodiment is different from the fifth embodiment in the following points, and the other points are basically the same as the fifth embodiment.

In the sixth embodiment, the motor protector 91 is attached to the motor end coil portion 3c with a string 186 through a thin film insulating member 110, and the lead wires 86, 87, 88 of the motor protector 91 at the center of the insulating member 110 are attached. A hole (opening) 110h is provided in a portion related to the connecting portion . After the assembly, the hole 110h communicates with the motor chamber 1b in which the upper surface of the motor protector 91 is a mixed region of the surrounding working gas and mist oil. The heat generated in the protector portion can be dissipated from the opening portion 110h. With this structure in which a part of the motor protector 110 communicates with the working gas region, the heat generated from the motor protector 110 can be directly radiated to the motor chamber. Further, a forced cooling action can be obtained directly by the gas flow, and the temperature rise of the motor protector 110 can be suppressed.

  Next, a seventh embodiment of the present invention will be described with reference to FIGS. 26 is a longitudinal sectional view of a motor protector used in a hermetic scroll compressor according to a seventh embodiment of the present invention, FIG. 27 is a plan view of a motor protector portion of the hermetic scroll compressor, and FIG. 28 is a part of FIG. It is a cross-sectional side view. The seventh embodiment differs from the fifth and sixth embodiments in the following points, and is basically the same as the fifth and sixth embodiments in the other points.

  The seventh embodiment is an embodiment in which the notch portion 110e of the fifth embodiment and the hole portion 110h of the sixth embodiment are made extremely large. The motor protector 110 is tied between the lower part 91f of the motor protector 91 and the motor coil end portion 3c via an insulating member 110 having a cushioning material function, for example, a thin-film polyester synthetic resin material as shown in FIG. It is attached so as to be wound by. The insulating member 110 includes a rib part 110i and a sheet part 110j. In the present invention, the function required by the present invention can be obtained only by the sheet portion 110j.

  The length L5 of the sheet-like insulating member 110 is a length obtained by adding the dimensions necessary for binding to the length of the motor protector 110 and binding with the string 186. The sheet width W3 is substantially the same as the width W1 of the coil end 3c (see FIGS. 16 and 20) for covering the lower part of the protector. Above the motor protector 91, the contact portions 86 to 88 are exposed to the motor chamber 1b in a bare state. That is, the portion of the motor protector 91 excluding the lower portion 91f is exposed and incorporated in the motor coil end portion 3c.

  According to the seventh embodiment, the heat generated by the motor protector 91 can be directly radiated to the motor chamber, and the cooling effect by forced convection due to the gas flow can be directly obtained, so that the temperature rise of the motor protector 91 is remarkably suppressed. Will be. Promoting the cooling of the motor protector 91 increases the MCC value and extends the number of ON / OFF lifetimes of the contact portion of the motor protector 91, leading to an increase in capacity as a protector.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a vertical type helium hermetic scroll compressor according to a first embodiment of the present invention. CC sectional drawing of FIG. DD sectional drawing of FIG. The top view of the fixed scroll of the 1st Example. The longitudinal cross-sectional view of the fixed scroll of the 1st Example. The top view of the turning scroll of the 1st Example. Vertical sectional view of the orbiting scroll of the first embodiment The motor circuit diagram of the 1st Example. The characteristic view which shows the relationship between the operating current of the motor protector of the said 1st Example, and the ambient temperature around a motor protector. Sectional drawing of the part which provided the recessed part in the motor coil end part of the same 1st Example, and attached the motor protector. Sectional drawing in the different direction of the part which attached the motor protector of FIG. The longitudinal cross-sectional view which shows the vertical scroll compressor for helium of the vertical type of 2nd Example of this invention. EE sectional drawing of FIG. The longitudinal cross-sectional view which shows the vertical type hermetic scroll compressor of the 3rd Example of this invention. The cross-sectional view in the hermetic scroll compressor of 4th Example of this invention. The principal part longitudinal cross-sectional view of the hermetic scroll compressor of the 4th Example. The longitudinal section of the motor protector of the hermetic scroll compressor of the 4th example. The top view of the motor protector part of the hermetic scroll compressor of the 4th example. The side view of FIG. The cross-sectional view of the modification of the hermetic scroll compressor of the fourth embodiment. The top view of the motor protector part of the enclosed scroll compressor of 5th Example of this invention. The partial cross section side view in FIG. The longitudinal cross-sectional view of the motor protector used for the hermetic scroll compressor of 6th Example of this invention. The top view of the motor protector part of the hermetic scroll compressor of the 6th example. The partial cross section side view in FIG. The longitudinal cross-sectional view of the motor protector used for the hermetic scroll compressor of 7th Example of this invention. The top view of the motor protector part of the hermetic scroll compressor of the 7th example. The partial cross section side view in FIG. The cross-sectional view which shows the conventional vertical type helium hermetic scroll compressor. The side view of the electric motor part which shows the attachment structure of the motor protector of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sealed container, 1a ... Discharge chamber, 1b1, 1b2 ... Electric motor chamber, 3 ... Electric motor part, 3a ... Motor stator, 3b ... Motor rotor, 3c ... Discharge pipe side motor coil end part, 3e ... Motor coil end of the passage 18 side Part, 3g ... concave part of motor coil end part, 5 ... fixed scroll, 5a ... fixed scroll end plate, 6 ... turning scroll end plate, 6a ... turning scroll end plate, 7 ... frame, 8 ... compression chamber, 10 ... discharge port, 14 ... rotation Shaft, 14a ... eccentric shaft, 15 ... suction port, 17 ... suction pipe, 18a, 18b ... passage, 20 ... discharge pipe, 22 ... port, 23 ... lubricating oil, 25 ... passage, 27 ... oil suction pipe, 30 ... Oil take-out pipe, 31 ... Oil injection pipe, 32 ... Slewing bearing, 38 ... Oldham mechanism, 39 ... Auxiliary bearing, 40 ... Main bearing, 53 ... O-ring, 85 ... Lead wire for main power supply, 86, 87, 88 Lead wire for neutral point, 91 ... motor protector, 91a to 91c ... protector pin part, 91f ... lower part of protector, 110 ... insulating member, 110a, 10b ... projection, 110c, 10d ... opening, 110e ... notch, 110f, 110g ... both ends, 110h ... hole, 110i ... rib part, 110j ... sheet part, 186 ... tied string.

Claims (2)

Use helium gas as working gas,
While storing a scroll compressor part and an electric motor part in an airtight container,
The scroll compressor unit engages a fixed scroll that erects a spiral wrap on the end plate and a orbiting scroll that erects the spiral wrap on the end plate with the wraps inside each other, and the orbiting scroll is used as a rotating shaft. Engaging with a continuous eccentric mechanism, the orbiting scroll is rotated with respect to the fixed scroll without rotating, and the fixed scroll is provided with a discharge port that opens at the center and a suction port that opens at the outer periphery. The working gas is sucked from the suction port, moved around the compression chamber formed by the fixed scroll and the orbiting scroll, the volume is reduced, the working gas is compressed, and the compressed working gas is discharged. Configured to discharge from the outlet into the container chamber,
In the hermetic scroll compressor that discharges the discharged working gas to the outside through the discharge pipe,
An oil injection pipe for cooling the working gas is connected to an oil injection port provided on the end plate of the fixed scroll,
A motor protector that directly cuts the motor circuit that energizes the motor coil by an abnormal increase in motor current and abnormal increase in working gas temperature,
Attach the motor protector with a tie string through a thin film insulating member whose upper surface is open to the motor coil end that is a mixed working gas region of mist oil and working gas discharged from the discharge port ,
The motor protector is mounted on the thin-film insulating member so that the upper portion of the motor protector is exposed to the mixed working gas region of the mist oil and working gas while ensuring a predetermined insulating distance between the upper portion of the motor protector and the sealed container. A hermetic scroll compressor characterized by being installed. Use helium gas as working gas,
Place the scroll compressor part and the electric motor part in the airtight container with the frame sandwiched between them.
Connecting the electric motor part and the scroll compressor part with a rotating shaft passing through the frame;
The inside of the sealed container is partitioned by the frame into a discharge chamber in which the scroll compressor unit is arranged and a motor chamber in which the electric motor unit is arranged,
Dividing the motor chamber into an upper motor chamber and a lower motor chamber in the electric motor section;
Providing a passage communicating the discharge chamber and the upper motor chamber at the outer edge of the frame;
A plurality of passages communicating with the upper motor chamber and the lower motor chamber are provided in an outer edge portion of the electric motor portion,
A discharge pipe is provided in the sealed container so as to communicate with the upper motor chamber located on the opposite side of the outer edge of the frame;
The scroll compressor unit engages a fixed scroll that erects a spiral wrap on the end plate and a orbiting scroll that erects the spiral wrap on the end plate with the wraps inside each other, and the orbiting scroll is used as a rotating shaft. Engaging with a continuous eccentric mechanism, the orbiting scroll is rotated with respect to the fixed scroll without rotating, and the fixed scroll is provided with a discharge port that opens at the center and a suction port that opens at the outer periphery. The working gas is sucked from the suction port, moved around the compression chamber formed by the fixed scroll and the orbiting scroll, the volume is reduced, the working gas is compressed, and the compressed working gas is discharged. Configured to discharge from the outlet into the discharge chamber;
The discharged working gas is guided to the upper motor chamber through a passage at the outer edge of the frame, and the working gas flowing into the upper motor chamber flows to the discharge pipe through the upper motor chamber; In the hermetic scroll compressor configured to divide the flow into the discharge pipe through the passage of the outer edge portion of the section and the lower motor chamber, and to discharge outside through the discharge pipe,
An oil injection pipe for cooling the working gas is connected to an oil injection port provided on the end plate of the fixed scroll,
A motor protector that directly cuts the motor circuit that energizes the motor coil by an abnormal increase in motor current and abnormal increase in working gas temperature,
The motor protector is closely attached to a motor coil end portion facing the upper motor chamber, which is a mixed working gas region of mist oil and working gas discharged from the discharge port , through a thin film insulating member having an upper surface opened. And tie it up with a strap ,
The motor protector is directly tied with the strap so that the upper part of the motor protector is exposed to the mixed working gas region of the mist-like oil and working gas with a predetermined insulation distance between the upper part of the motor protector and the sealed container. In addition, the motor protector is mounted on the thin film insulating member . A hermetic scroll compressor.

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