JPH0771384A - Oil pump of hermetic compressor - Google Patents

Abstract

PURPOSE:To provide an oil pump of a hermetric compressor capable of easily finding that a thrust plate is directed to a different direction from a specified direction in assembling to install the thrust plate and a cover plate on a cylinder. CONSTITUTION:This oil pump is furnished with a cylinder the lower surface part of which is opened, a rotor arranged inside of the cylinder, a thrust plate 74 installed on the cylinder and to close the lower surface part of this cylinder and a cover plate 75 supporting this thrust plate 74 from the lower side and installed on the cylinder, and the cover plate 75 has a suction hole 82 and a discharge hole 84. The thrust plate 74 has a suction port 83 communicating the suction hole 82 and the inside of the cylinder through to each other, an oil discharge hole communicating the oil discharge hole and the inside of the cylindes through to each other and a communicating hole communicating the oil discharge hole and an oiling hole, and on the thrust plate 74, a protruded part 91 to confirm an assembling position protruded outside is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump incorporated in a hermetic compressor to supply lubricating oil to sliding parts of the compressor.

[0002]

2. Description of the Related Art In a hermetic compressor such as a scroll compressor or a rotary compressor, a compression mechanism and an electric motor are vertically arranged inside a hermetic housing, and a rotary shaft of the electric motor is connected to the compression mechanism. The rotating shaft is rotated by the electric motor, and the compression mechanism is driven by the rotating shaft.

Generally, in these hermetic compressors, the lubricating oil, which is incorporated in the lower end of the rotary shaft and which is stored in the inner bottom of the hermetic housing, is sucked into the rotary shaft through a lubrication hole formed inside the rotary shaft. The moving part is equipped with an oil pump for refueling.

Conventionally, the oil pump provided in this hermetic compressor has a structure shown in FIGS. 6 to 8.
In the figure, 1 is a closed housing. 2 is a closed housing 1
Is a cylinder arranged on the inner bottom of the cylinder and has a cylinder chamber 3 whose lower surface is open. The cylinder 2 is fixed to the closed housing 1 by a stay 4 formed integrally with the cylinder 2. A lower surface opening portion of the cylinder chamber 3 is closed by a thrust plate 5 and a cover plate 6 attached to the cylinder 2.

Reference numeral 7 denotes a rotary shaft, the lower end of which is inserted into the cylinder 2, and an eccentric shaft 8 is formed at the lower end located in the cylinder chamber 3. Reference numeral 9 denotes an annular rotor arranged inside the cylinder chamber 3, which is rotatably fitted to the outer peripheral portion of the eccentric shaft 8 so that the outer peripheral surface contacts the inner peripheral surface of the cylinder chamber 3 and the It is limited to crescent.

A blade-shaped projection 10 extending in the diametrical direction is integrally formed on the outer peripheral portion of the rotor 9, and the slot 1 is formed on the inner peripheral surface of the cylinder chamber 3 along the small diameter direction.
1 is slidably inserted. The projection 10 partitions the cylinder chamber 3 into an oil supply chamber 3a and an oil discharge chamber 3b, and
Rotation of the rotor 9 is prevented. The outer periphery of the rotor 9 is circular except for the protrusion 10.

As shown in FIG. 8, a suction hole 12 is formed in the cover plate 6 below the oil supply chamber 3a of the cylinder chamber 3 and communicates with the inner bottom portion of the closed housing 1. . The thrust plate 5 has a suction hole 12 located below the oil supply chamber 3a and a suction port 13 communicating with the oil supply chamber 3a.

Further, as shown in FIG. 8, the cover plate 6
A discharge hole 14 is formed in the. Thrust plate 5
Has a discharge port 15 located below the oil discharge chamber 3b and communicating with the discharge hole 14 and the oil discharge chamber 3b of the cylinder chamber 3. The communication hole communicates with the discharge hole 14 and the oil supply hole 17 of the rotary shaft 4. The hole 16 is formed.

Further, the thrust plate 5 is formed with a pair of mounting holes 18a and 18b at equal distances on the same diametrical line with the center therebetween. The cover plate 6 has a pair of mounting holes 19a and 19b formed at positions facing the pair of mounting holes 18a and 18b.

The thrust plate 5 is arranged in direct contact with the lower surface of the cylinder 2 to close the lower surface open portion of the cylinder chamber 3, and receives the lower surface of the eccentric shaft 8 and the lower surface of the rotor 9 inside the cylinder chamber 3. The cover plate 6 is disposed on the lower side of the thrust plate 5 and supports the thrust plate 5 by mounting the thrust plate 5 on the upper surface thereof.

Then, as shown in FIG. 6, the bolts 20A,
20B from the lower side of the cover plate 6 to the mounting holes 19a and 19b of the cover plate 6 and the thrust plate 5
Of the cover plate 6 and the thrust plate 5 by passing through the pair of mounting holes 18a and 18b, and further screwing into a screw hole (not shown) formed in the cylinder 2 for tightening.
Is fixed to the cylinder 2.

The positions of the cover plate 6 and the thrust plate 5 with respect to the cylinder 2 will be described below. The suction port 13 of the thrust plate 5 and the suction hole 12 of the cover plate 6 form the oil supply chamber 3 of the cylinder chamber 3.
The discharge port 15 of the thrust plate 5 and one end of the discharge hole 14 of the cover plate 6 are located on the lower side of a.
The cover plate 6 and the thrust plate 5 are set in the mounting orientation so that the other ends of the communication hole 16 and the discharge hole 14 are located below the oil supply hole 17 of the rotary shaft 4. . Then, when the cover plate 6 and the thrust plate 5 are mounted by the bolts 20A and 20B, the mounting holes 19a and 19b of the cover plate 6 and the thrust plate 5 are arranged so that the cover plate 6 and the thrust plate 5 are located at the above-mentioned mounting orientation positions. The positions of the pair of mounting holes 18a and 18b are set.

The oil supply hole 17 is formed inside the rotary shaft 4 along the axial direction from the lower end to the upper end. Lubricating oil OIL is stored in the inner bottom portion of the closed housing 1.

When the oil pump thus constructed is rotated together with the rotary shaft 7 rotated by the electric motor, the eccentric shaft 8 is eccentrically rotated in the direction of the arrow in the figure. The rotor 9 is pushed by the eccentric shaft 8 that rotates eccentrically, and makes an orbital revolving motion while the outer peripheral surface slides in line with the inner peripheral surface of the cylinder chamber 3 of the cylinder 2. As the rotor 9 rotates, the respective volumes of the oil supply chamber 3a and the oil discharge chamber 3b in the cylinder chamber 3 increase and decrease relatively and change.

As the volume of the oil supply chamber 3a increases, the lubricating oil OIL stored in the inner bottom portion of the closed housing 1 passes through the suction hole 12 of the cover plate 6 and the suction 13 of the thrust plate 5. It is sequentially sucked into the oil supply chamber 3a of the cylinder chamber 3. Further, as the volume of the oil discharge chamber 3b of the cylinder chamber 3 decreases, the lubricating oil OIL in the oil discharge chamber 3b is pressurized and discharged from the discharge port 15 of the thrust plate 5.

The discharged lubricating oil OIL flows from one end of the discharge hole 14 of the cover plate 6 to the other end thereof, is sent from the lower end of the rotary shaft 7 to the oil supply hole 17 through the communication hole 16 of the thrust plate 5, and is supplied to the oil supply hole 17. It flows out from the upper end of the rotating shaft 7 and is supplied to each sliding portion in the compression mechanism to perform lubrication. After that, the lubricating oil OIL flows down inside the closed housing 1 and accumulates at the bottom again.

[0017]

In such an oil pump, when the thrust plate 5 and the cover plate 6 are mounted at the mounting orientations described above and shown in FIG. A passage is formed in which the lubricating oil OIL at the bottom is sucked into the cylinder chamber 3, further pressurized, discharged from the cylinder chamber 3, and supplied to the oil supply hole 17 of the rotary shaft 7.

However, when the thrust plate 5 is positioned in a direction different from the predetermined mounting direction described above, for example, in the direction shown in FIG. 9, the suction port 13 and the discharge port 15 become the suction holes 12 of the cover plate 6. The wall of the thrust plate 5 separates from the discharge hole 14 and closes the suction hole 12 and the discharge hole 14 of the bar plate 6. As a result, the lubricating oil OIL at the inner bottom portion of the closed housing 1 is sucked into the cylinder chamber 3, further pressurized, discharged from the cylinder chamber 3, and supplied to the oil supply hole 17 of the rotary shaft 7. Become.

That is, when the assembly work for attaching the thrust plate 5 and the cover plate 6 to the cylinder 2 is performed, the thrust plate 5 and the cover plate 6 are combined and arranged on the lower surface side of the cylinder 2, and then the bolt 20 is used.
Attach to cylinder 2 with A and 20B. Here, in order to pass the bolts 20A and 20B, the thrust plate 5 and the cover plate 6 are provided with a pair of mounting holes 18a and 18b.
And the pair of mounting holes 19a and 19b are opposed to each other and combined.

However, the pair of mounting holes 18a, 18b of the thrust plate 5 and the pair of mounting holes 19a, 19b of the cover plate 6 are at the target positions with their respective centers sandwiched in each plate. This is for equalizing the forces applied to the thrust plate 5, the cover plate 6 and the cylinder 2.

Therefore, not only when the thrust plate 5 is in the predetermined position, but also the pair of mounting holes 18a, 18a
b and a pair of mounting holes 19a and 19b for the cover plate 6
The bolts 20A and 20B can be inserted to face each other.
Further, when the thrust plate 5 is placed at a position different from the predetermined position, the pair of mounting holes 18
b, 18a and a pair of mounting holes 19 for the cover plate 6
Since a and 19b face each other, the bolts 20A and 20B can be inserted.

Therefore, in the assembly work for attaching the thrust plate 5 and the cover plate 6 to the cylinder 2,
Even if the thrust plate 5 is positioned in a direction different from the predetermined position, this cannot be found at the stage of the assembly work, and the thrust plate 5 is positioned in a direction different from the predetermined position. In some cases, the thrust plate 5 and the cover plate 6 may be attached to the cylinder 2. In this case, the oil pump cannot operate normally.For example, when the manufactured compressor is test-operated at the factory, it is necessary to detect the oil pump abnormality and reassemble the oil pump. It adversely affects the productivity in manufacturing.

It is conceivable that the positions of the pair of mounting holes 18a, 18b of the thrust plate 5 and the pair of mounting holes 19a, 19b of the cover plate 6 may be unequal with respect to the center of each plate. In this case, the force applied to the thrust plate 5, the cover plate 6 and the cylinder 2 becomes uneven.

The present invention has been made in view of the above circumstances, and when the thrust plate 5 is in a position different from the predetermined position in the assembly work for mounting the thrust plate and the cover plate on the cylinder, It is an object of the present invention to provide an oil pump for a hermetic compressor that can be easily found and can be accurately assembled, and can prevent an adverse effect on productivity due to assembly failure.

[0025]

To achieve the above object, an oil pump for a hermetic compressor according to the present invention is incorporated in a lower end portion of a rotary shaft for driving a compression mechanism housed inside a hermetic housing, In an oil pump that sucks lubricating oil stored in the inner bottom portion of the closed housing and supplies oil to the sliding portion of the compression mechanism through an oil supply hole formed inside the rotary shaft, a cylinder whose lower surface portion is open, A rotor that is disposed inside the cylinder and slidably contacts the inner peripheral surface of the cylinder chamber to define the cylinder chamber and that is rotated by being combined with the lower end of the rotary shaft and a lower surface of the cylinder that is attached to the cylinder. A thrust plate that closes the rotor and supports the rotor, and supports the thrust plate from below and attaches it to the cylinder by aligning the attachment position with the thrust plate. A cover plate having a suction hole and a discharge hole, and the thrust plate is attached to the cylinder at the same position as the cover plate. The thrust plate includes a suction port that communicates the suction hole with the inside of the cylinder, a discharge port that communicates the discharge hole with the inside of the cylinder, and a communication hole that communicates the discharge hole with the oil supply hole. Is provided with a protrusion for assembling position confirmation, which protrudes outward from the cover plate.

[0026]

When the thrust plate and the cover plate are mounted on the cylinder by inserting bolts into the mounting holes formed in the thrust plate and the cover plate, the thrust plate is mounted in a predetermined mounting direction, that is, the suction port of the thrust plate and the suction hole of the cover plate are located in the cylinder chamber. It is located below the oil supply chamber, one end of the discharge port of the thrust plate and the discharge hole of the cover plate is located below the oil discharge chamber, and the other end of the communication hole and the discharge hole is below the oil supply hole 1 of the rotary shaft. When it is oriented toward the side, the protrusion formed on the thrust plate and protruding outside the cover plate is positioned at a position corresponding to the predetermined direction. The operator knows that the thrust plate is positioned in a predetermined direction by looking at the position of the protrusion.

Further, the thrust plate is in a direction different from the predetermined mounting direction, that is, the suction port and the discharge port of the thrust plate are disengaged from the suction hole and the discharge hole of the cover plate, and the wall of the thrust plate is the suction hole and the suction hole of the cover plate. When positioned so as to close the discharge hole, the protrusion formed on the thrust plate is positioned at a position different from the position corresponding to the predetermined direction. The operator knows that the thrust plate is positioned in a direction different from the predetermined direction by observing the position of the protruding portion.

Therefore, in the assembling work for attaching the thrust plate and the cover plate to the cylinder, when the thrust plate is in a position different from the predetermined position, it can be easily found and accurate assembly can be performed. You can

[0029]

Embodiments of the present invention will be described with reference to FIGS. First, a scroll type compressor as an example of a hermetic type compressor equipped with the oil pump of the present invention is shown in FIG.
Will be described with reference to.

In FIG. 1, the interior of the closed housing 31 is partitioned by a discharge cover 32 into a high pressure space 33 and a low pressure space 34. Inside the low-pressure space 34, a scroll-type compression mechanism C is provided in an upper part, and an electric motor M is provided in a lower part.
However, the oil pumps P of the present invention are further provided at the bottom of the low-pressure space 34 (bottom of the closed housing 31), and these are the scroll type compression mechanism C, the electric motor M, and the oil pump P.
Are connected by a rotary shaft 35 provided in the electric motor M.

The electric motor M includes a stator 36 fixed to the hermetic housing 31, a rotor 37 assembled inside the stator 36, and a rotary shaft 3 inserted and fixed to the rotor 37.
5, the rotary shaft 35 extends below and above the rotor 37, respectively.

The scroll type compression mechanism C has a fixed scroll 38 and an orbiting scroll 39.
8 includes an end plate 40 and a spiral wrap 41,
The discharge port 42 is provided in the. The orbiting scroll 39 includes an end plate 43 and a spiral wrap 44, and
A bush 46 is rotatably fitted into a boss 45 provided on the lower surface of the bush 3 via a bearing 47.
An eccentric shaft 48 provided at the upper end of the rotary shaft 35 is slidably inserted into the shaft 6.

Fixed scroll 38 and orbiting scroll 39
The end plate 40 and the end plate 43 are eccentric by a predetermined distance, and a plurality of closed spaces 49 are formed in which the wrap 41 and the wrap 44 are mutually combined at an angle of 180 degrees. The orbiting scroll 39 is slidably supported by a casing 50 fixed inside the closed housing 31, and between the orbiting scroll 39 and the casing 50,
A rotation preventing mechanism 51 is provided which allows the orbiting scroll 39 to orbit but does not rotate.

The outer periphery of the end plate 40 of the fixed scroll 38 is supported by a casing 50 so as to be floatable, and cylindrical flanges 52, 53 are provided on the upper surface of the end plate 40 of the fixed scroll 38.
Are arranged concentrically.

A back pressure chamber 55 is formed between the cylindrical flanges 52 and 53 by fitting a cylindrical flange 54 provided on the lower surface of the discharge cover 32 in a sealed and slidable manner. The back pressure chamber 55 communicates with a closed space 49 in the middle of gas compression through a hole 56 provided in the end plate 40. Here, the hole 56 is located at a point in contact with the inner peripheral side of the wrap 41, and the high pressure chamber 57 is located on the inner peripheral side of the back pressure chamber 55.
Is formed, and a low pressure chamber 58 is formed on the outer peripheral side.
A gas suction pipe 59 is provided in the low pressure space 34 of the closed housing 31, and a gas discharge pipe 60 is provided in the high pressure space 35.

In such a structure, the rotation shaft 35 is rotated by driving the motor M, and this rotation is transmitted to the orbiting scroll 39 of the compression mechanism C via the eccentric shaft 48, the bush 46 and the boss 45. The orbiting scroll 39, while being prevented from rotating by the rotation preventing mechanism 51, makes a revolution orbiting motion on a circular orbit having a radius of a favorable orbiting radius.

Then, the gas enters the low-pressure space 34 of the closed housing 31 through the suction pipe 59, and is sucked into the closed section of the compression mechanism C via a path not shown. And
The closed space 4 is formed by the orbiting motion of the orbiting scroll 39.
As the volume of the gas 9 decreases, the gas is compressed and reaches the central portion, enters the high pressure space 33 from the discharge port 42 through the high pressure chamber 57, and is discharged to the outside through the gas discharge pipe 60.

At this time, the fixed scroll 38 is pressed against the orbiting scroll 39 by the gas pressure in the high pressure chamber 57 and the back pressure chamber 55 to prevent the gas from leaking from the inside of the closed space 49. When the liquid is sucked into the closed space 49, the fixed scroll 38 floats up and allows the liquid to escape, thereby preventing damage to the compression mechanism.

Next, an embodiment of the oil pump P which is the object of the present invention will be described with reference to FIGS. Reference numeral 71 in the drawing denotes a cylinder arranged and fixed to the inner bottom portion of the closed housing 31, and this has a cylinder chamber 72 whose lower surface portion is open. The cylinder 71 is fixed to the closed housing 31 by a stay 73 formed integrally therewith. The lower surface opening portion of the cylinder chamber 72 is closed by a thrust plate 74 and a cover plate 75, which are examples of a closing member attached to the cylinder 71 by bolts.

The lower end of the rotary shaft 35 is inserted into the cylinder 71, and an eccentric shaft 76 is formed at the lower end located in the cylinder chamber 72. Reference numeral 77 denotes an annular rotor arranged inside the cylinder chamber 72. The rotor 77 is rotatably fitted to the outer peripheral portion of the eccentric shaft 76, the outer peripheral surface of which contacts the inner peripheral surface of the cylinder chamber 72, so that the cylinder chamber 72 is closed. It is limited to crescent.

A blade-shaped protrusion 78 extending in the diametrical direction is integrally formed on the outer peripheral portion of the rotor 77, and is slidable in a slot 79 formed in the inner peripheral surface of the cylinder chamber 72 along the diametrical direction. Has been inserted into. This protrusion 78
Divides the cylinder chamber 72 into an oil supply chamber 80 and an oil discharge chamber 81, and prevents rotation of the rotor 77.

As shown in FIG. 4, a suction hole 82 is formed in the cover plate 75 below the oil supply chamber 80 of the cylinder chamber 72, which communicates with the inner bottom portion of the hermetic housing 31. The thrust plate 74 has a suction hole 82.
Further, a suction port 83 communicating with the oil supply chamber 80 of the cylinder chamber 72 is formed.

Discharge holes 84 are formed in the cover plate 75, and the thrust plate 74 has discharge ports 85 communicating with the discharge holes 84 and the oil discharge chamber 81 of the cylinder chamber 72, and the discharge holes 84 and the oil supply holes of the rotary shaft 35. Communication holes 86 communicating with 87 are formed respectively.

Further, as shown in FIG. 4, a pair of mounting holes 88a and 88b are formed in the thrust plate 74 at equidistant positions on the same diametrical line with the center therebetween. The cover plate 75 has a pair of mounting holes 89a,
89b is formed at a position facing the pair of mounting holes 88a and 88b.

The thrust plate 74 is the cylinder 72.
Is placed in direct contact with the lower surface of the cylinder chamber 72 to close the lower surface open portion of the cylinder chamber 72, and receives the lower surface of the eccentric shaft 76 and the lower surface of the rotor 77 inside the cylinder chamber 72. The cover plate 75 is arranged on the lower side of the thrust plate 74, and the thrust plate 74 is placed on the upper surface of the cover plate 75 to support it.

Then, as shown in FIG. 2, the bolts 90A,
90B is passed from the lower side of the cover plate 25 through the mounting holes 89a, 89b of the cover plate 25 and the pair of mounting holes 88a, 88b of the thrust plate 74, and further screwed into a screw hole (not shown) formed in the cylinder 71 for tightening. As a result, the cover plate 75 and the thrust plate 74 are attached and fixed to the cylinder 71.

Here, the mounting positions of the cover plate 75 and the thrust plate 74 with respect to the cylinder 71 will be described. The suction port 83 of the thrust plate 74 and the suction hole 82 of the cover plate 75 are located below the oil supply chamber 80 of the cylinder chamber 72, and the discharge port 8 of the thrust plate 74 is disposed.
5, one end of the discharge hole 82 of the cover plate 75 is the drainage chamber 8
1, the mounting positions of the cover plate 75 and the thrust plate 74 are set so that one ends of the communication hole 86 and the discharge hole 84 are located below the oil supply hole 87 of the rotary shaft 35. Then, when the cover plate 75 and the thrust plate 74 are mounted by the bolts 90A and 90B, the mounting holes 89a and 89b of the cover plate 75 and the thrust plate 74 are positioned so that the cover plate 75 and the thrust plate 74 are located in the mounting orientation positions described above. The positions of the pair of mounting holes 88a and 88b are set.

Further, as shown in FIG. 4, the thrust plate 5 has a protruding portion 91 for confirming the mounting direction of the thrust plate 74 when performing the assembly work for mounting the thrust plate 5 and the cover plate 75 on the cylinder 71. Are formed. The projecting portion 91 projects outward from the outer peripheral side of the cover plate 75 so that the operator can confirm it, and is formed by extending a part of the peripheral portion of the thrust plate 74 into a triangular projecting piece shape, for example.

The oil supply hole 87 is formed inside the rotary shaft 35 from the lower end to the upper end along the axial direction.
Lubricating oil OIL is stored in the inner bottom portion of the closed housing 31.

Further, this oil pump is provided with a relief valve 93 which allows the lubricating oil OIL inside the oil pump to escape to the inner bottom portion of the closed housing 1 when the amount of oil supply exceeds a predetermined amount. That is, the cover plate 7
A discharge hole 84 communicating with the discharge hole 84 and the inner bottom portion of the hermetic housing 71 is formed in 5, and the lubricating oil OIL inside the oil pump is allowed to escape to the inner bottom portion of the hermetic housing 1 through the relief hole 92. There is.

The relief valve 93 includes the cover plate 7
5 is a circular valve element 94 that is arranged on the lower surface of the valve 5 to open and close the relief hole 92, and is arranged on the outside of the cover plate 75, and one end of which is in contact with the valve element 94 and is a relief hole for the valve element 94. A compression coil spring 95 for applying a force in the direction of closing 92
And a spring holder 96 which is disposed outside the cover plate 75 and receives the other end of the compression coil spring 95 while surrounding the other end thereof.

In the oil pump thus constructed, the eccentric shaft 35 is eccentrically rotated together with the rotary shaft 35 rotated by the electric motor M in the direction of the arrow in the figure. The rotor 77 is pushed by the eccentric shaft 76 that eccentrically rotates, and makes an orbital revolving motion while the outer peripheral surface slides in line with the inner peripheral surface of the cylinder chamber 72 of the cylinder 71. As the rotor 77 rotates, the capacities of the oil supply chamber 80 and the oil discharge chamber 81 in the cylinder chamber 72 relatively increase and decrease and change.

As the volume of the oil supply chamber 80 increases, the lubricating oil OIL stored in the inner bottom portion of the closed housing 31 passes through the suction hole 82 of the cover plate 75 and the discharge port 85 of the thrust plate 74. Are sequentially sucked into the oil supply chamber 80 of the cylinder chamber 72. Further, as the volume of the oil discharge chamber 81 of the cylinder chamber 72 decreases, the lubricating oil OIL in the oil discharge chamber 81 is pressurized and discharged from the discharge port 85 of the thrust plate 74.

The discharged lubricating oil OIL is sent from the lower end of the rotary shaft 35 to the oil supply hole 87 through the discharge hole 84 of the cover plate 75 and the communication hole 86 of the thrust plate 74, and passes through the oil supply hole 87 to pass through the oil supply hole 87. It flows out from the upper end and is supplied to each sliding portion in the compression mechanism C to perform lubrication.
After that, the lubricating oil OIL flows down through the inside of the hermetically sealed housing 31 and accumulates at the bottom again.

Thrust plate 74 and cover plate 7
The assembling work for attaching 5 to the cylinder 71 will be described. The thrust plate 74 and the cover plate 75 are attached to, for example, mounting holes 88a, 88b, 89 formed therein.
Cylinder 7 through bolts 90A and 90B on a and 89b
1, the thrust plate 74 is installed in a predetermined mounting direction, that is, the suction port 83 of the thrust plate 74 and the suction hole 82 of the cover plate 75 are located below the oil supply chamber 80 of the cylinder chamber 72 as shown in FIG. The discharge port 85 of the thrust plate 74 and one end of the discharge hole 84 of the cover plate 85 are positioned below the oil drainage chamber 81, and the communication hole 86 and the other end of the discharge hole 84 are located at the other end of the rotary shaft 3.
5, the projection 91 formed on the thrust plate 74 and projecting outward is positioned in a direction corresponding to a predetermined mounting direction.

The operator knows that the thrust plate 74 is located in the predetermined mounting direction C by observing the position of the projecting portion 91 projecting from the outer peripheral side of the cover plate 75. Further, for example, as shown in FIG. 5, the thrust plate 74 is oriented in a direction different from the predetermined mounting direction, that is, the suction port 83 and the discharge port 85 of the thrust plate 74 are separated from the suction hole 82 and the discharge hole 84 of the cover plate 75,
When the wall of the thrust plate 74 is positioned so as to close the suction hole 82 and the discharge hole 84 of the cover plate 75, the projection 91 formed on the thrust plate 74 is positioned in the direction D different from the position corresponding to the predetermined direction. To do.

The operator sees the position of the protruding portion 91 protruding from the outer peripheral side of the cover plate 75 and knows that the thrust plate 74 is positioned in a direction different from the predetermined mounting direction. Therefore, in the assembly work for attaching the thrust plate 74 and the cover plate 75 to the cylinder 71, when the thrust plate 74 is in a position different from the predetermined position, this can be easily found.
By doing so, accurate assembly can be performed.
Therefore, the thrust plate and the cover plate are attached to the cylinder while the thrust plate is in the position different from the predetermined position, and the oil pump cannot operate normally. It is possible to prevent the occurrence of a situation in which an oil pump abnormality is found during the test operation in a factory and the oil pump is reassembled.

The present invention is not limited to the above-described embodiments, but various modifications can be carried out. For example, the compression mechanism is not limited to the scroll type, but may be a rotary type or a rotary type.

Further, in order to attach the thrust plate and the cover plate to the cylinder, not only the bolts but also other means can be adopted. Further, the protrusion for confirming the assembly direction provided on the thrust plate is not limited to the protrusion.

[0060]

As described above, according to the oil pump of the hermetic compressor of the present invention, in the assembly work for mounting the thrust plate and the cover plate on the cylinder, the thrust plate is oriented in a direction different from the predetermined position. When it is in the position, it can be easily found, accurate assembly can be performed, and the bad influence on productivity due to assembly failure can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing a scroll type compressor equipped with an oil pump according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a portion of the oil pump in FIG.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a view showing a combination of a thrust plate and a cover plate in the same embodiment.

FIG. 5 is a view showing a combination of a thrust plate and a cover plate in the same embodiment.

FIG. 6 is a cross-sectional view showing a conventional oil pump.

FIG. 7 is a sectional view taken along the line BB of FIG.

FIG. 8 is a view showing a combination of a thrust plate and a cover plate in the conventional example.

FIG. 9 is a view showing a combination of a thrust plate and a cover plate in the conventional example.

[Explanation of symbols]

31 ... Airtight housing, 35 ... Rotating shaft, 71 ... Cylinder, 72 ... Cylinder chamber, 74 ... Thrust plate, 75 ... Cover plate, 76 ... Eccentric shaft, 77 ... Rotor, 91 ... Projection part.

Claims (1)

[Claims] 1. A rotary shaft, which is incorporated in a lower end of a rotary shaft for driving a compression mechanism housed in the closed housing, sucks lubricating oil stored in an inner bottom of the closed housing, and is formed inside the rotary shaft. In the oil pump that supplies oil to the sliding portion of the compression mechanism through the oil supply hole, the cylinder chamber is defined by the cylinder having an open lower surface and the cylinder arranged inside the cylinder and slidingly contacting the inner peripheral surface of the cylinder chamber. And a rotor that is rotated by being combined with the lower end of the rotary shaft, a thrust plate that is attached to the cylinder and closes the lower surface of the cylinder to support the rotor, and the thrust plate that supports the thrust plate from below. A plate and a cover plate that is attached to the cylinder at the same mounting position. The cover plate has a suction hole and a discharge hole. The thrust plate has a suction port that communicates the suction hole with the inside of the cylinder when the thrust plate is mounted on the cylinder in the same mounting direction as the cover plate. The cylinder has a discharge port that communicates with the inside of the cylinder and a communication hole that communicates the discharge hole with the oil supply hole, and the thrust plate is provided with a protrusion for confirming a mounting position that protrudes outward from the cover plate. An oil pump for a hermetic compressor characterized by being provided.