JPH01290986A - Scroll type hydraulic machine - Google Patents

Abstract

PURPOSE:To lubricate an anti-rotation mechanism sufficiently by arranging a union for sucking refrigerant between a casing motor and an upper bearing support member and providing a refrigerant flow path communicated with the union and passing refrigerant gas toward the bottom of the casing. CONSTITUTION:A suction union 35 is secured to the upper side of the stator 25 in a lower case 5 while penetrating through the case 5, and a suction pipe is coupled with the union 35 in order to suck refrigerant. A pipe 37 is coupled to the union 35 with the opening 37a at the tip thereof being bent to face with the space section 39 between adjoining salient poles 25a of the stator 25. Consequently, refrigerant gas is led from the union 35 into the space 39 to cool the stator 25 and a coil 27 thus forming a refrigerant flow path with the pipe 37.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a closed scroll fluid machine used in air conditioners, refrigeration equipment, etc.

(Prior Art) As a conventional souffle fluid machine, there is a scroll type electric compressor using a spiral scroll member.

In this type of electric compressor, a crankshaft is provided eccentrically to the drive shaft of an electric motor, and a movable scroll member is connected to the crankshaft. As the drive shaft rotates, the movable scroll member moves eccentrically and compresses refrigerant gas in a plurality of compression chambers formed between the movable scroll member and the fixed scroll member fixed to the case.

In addition, in order to prevent rotational movement of the movable scroll member during eccentric movement, a rotation prevention mechanism using, for example, a ball bearing is provided between the movable scroll member and the case. This prevents the movable scroll member from rotating when the machine is driven.

The rotation prevention mechanism using ball bearings uses two thrust plates that guide the eccentric movement of the balls (for example, Japanese Patent Publication No. 6O-22i99).

(Problem to be solved by the invention) However, in the electric compressor using the above ball bearing rotation prevention mechanism, each thrust plate simply guides the balls, and the case side and the movable scroll member are connected to each other. Since each ball itself directly receives the thrust force acting during the point contact, the wear of each ball becomes significant and it is difficult to ensure smooth movement of the bearing portion.

In addition, according to the conventional electric compressor described above, the union for sucking refrigerant was installed at the bottom of the case, that is, below the electric motor, so that the oil accumulated at the bottom of the case was turned into a mist. Therefore, there is a possibility that sufficient lubrication of the rotation prevention mechanism, in particular where the thrust force is concentrated, may not be achieved.

Therefore, in the present invention, a rotation prevention mechanism using a pin is used,
The object of the present invention is to provide a scroll fluid machine that alleviates the thrust force that acts directly on the pins, prevents damage and wear of the pins, and also creates oil mist.

(Means for Solving the Problems) A scroll fluid machine of the present invention includes an electric motor disposed on the lower side inside a sealed case, and an upper bearing fixed to the case and supporting the upper part of the drive shaft of the electric motor. a support member;
a crankshaft connected to the drive shaft and eccentric with respect to the drive shaft; a fixed scroll member fixed to the upper side of the case; a movable scroll member that moves eccentrically while meshing with each other; a rotation prevention mechanism that prevents rotation of the movable scroll member; an annular stationary thrust plate that is fixed to the bearing support member; An annular movable thrust plate fixed to the movable scroll member and in surface contact with the fixed thrust plate, and a pin inserted into the holes of both thrust plates, and the electric motor and the upper bearing support member of the case. The structure includes a refrigerant suction union provided between the refrigerant and the refrigerant passage, and a refrigerant flow path that communicates with the union and allows the refrigerant to flow toward the bottom of the case.

(Operation) The drive shaft rotates due to the drive of the electric motor, and the crankshaft performs eccentric movement accordingly. Due to the eccentric movement of the crankshaft, the movable scroll member connected to the crankshaft moves eccentrically while meshing with the fixed scroll member, and refrigerant gas is compressed in the compression chamber formed between both scroll members.

The refrigerant gas flows from the suction union toward the bottom of the case through the refrigerant passage, and from the motor side to both scroll members. In this case, the refrigerant gas guided into the case from the refrigerant flow path first collides with the oil level accumulated at the bottom of the case and passes through the motor, so the collision promotes the formation of oil mist. , the oil mis 1~ is sufficiently mixed into the refrigerant, and sufficient lubrication is performed in the rotation prevention mechanism. In addition, in the 5-rotation prevention mechanism, the thrust force acting between the case side and the movable scroll member is received by both thrust plates that are in surface contact with each other, and no weight is applied to the pin connecting them. damage etc. can be prevented.

(Example) An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a scroll-type hermetic electric compressor (scroll fluid machine) 1, in which 3.5 is an upper case and a lower case, and 7 is a bearing support plate. The upper case 3 and the lower case 5 are connected to each other with a bearing support plate 7 and a shim 9 interposed therebetween by a plurality of bolts 11 so that the inside thereof is sealed. The shim 9 is provided to adjust the axial dimension.

A drive shaft 13 is disposed in the vertical direction inside the case 3.5, and the lower part of the drive shaft 13 is connected to the lower case 3.5 through a bearing 15.
The upper part of the drive shaft 13 is supported by the bearing member 7 via a bearing 17. Note that 19 in FIG. 1 is a collar link to the slot 1 of the bearing 17.

A columnar rotor 21 made of a laminated iron core is fixed to the lower end side of the drive shaft 13, and a permanent magnet 23 that sequentially constitutes an N pole and an S pole is attached to the circumferential surface of this rotor 21.

Further, a cylindrical stator 25 made of a laminated iron core is disposed on the outer periphery of the permanent magnet 23, and this stator 25 is attached to the lower case 5.
Fixed. As shown in FIG. 2, an excitation coil 27 is wound around each salient pole 25a of the stator 25, and a brushless electric motor 28 is constituted by these coils. The excitation coil 27 is supported by a support member 29 fixed to the lower case 5, as shown in FIG.
The lead wire 33 is connected to a lead wire 33 that passes through the case 5, and the lead wire 33 is drawn out of the case 5.

A suction union 35 is fixed to the upper side of the stator 25 of the lower case 5 through the case 5.
A suction vibrator (not shown) is connected to the refrigerant to suck refrigerant. A vibrator 37 is connected to the union 35, and a distal opening 37a of the vibrator 37 connects to the space 3 between adjacent salient poles 25a of the stator 25, as shown in FIGS.
It is bent so that it faces 9.

Therefore, as shown by the arrow in FIG.
7 to the space 39 between the salient poles 25a, the stator 25 and the coil 27 are cooled, and the vibrator 37 forms a coolant flow path. Furthermore, the refrigerant gas that has passed through the space 39 collides with the inner surface of the bottom of the lower case 5, passes through the gap between the rotor 21 and the stator 25, and reaches the upper side, thereby cooling the motor 28 again. In this case, the refrigerant gas colliding with the bottom of the case turns the oil adhering to the inner surface of the bottom of the lower case 5 into mist (particulates), which flows upward as refrigerant gas mixed with oil mist. In this way, since the oil mist is promoted to be mixed into the refrigerant gas, the rotation prevention mechanism 58, which will be described later, can be sufficiently lubricated.

As shown in FIG. 1, the upper end of the drive shaft 13 is integrally formed with a crankshaft 13A whose center 0° is eccentric from the center 01 of the drive shaft 13 by a predetermined distance. This crankshaft 13A is inserted through a metal bearing 43 into a connecting insertion part 41a formed in a concave shape on the back side of the movable scroll member 41, and the crankshaft 13A rotates as the drive shaft 13 rotates. As a result, the movable scroll member 41 is driven to rotate. In addition, since the crankshaft 13A is eccentric with respect to the drive shaft 13, in order to stabilize the rotational balance of the drive shaft 13, the drive shaft 13A is
A balance weight 45 is fixed below the bearing 17 with a screw 47.

As shown in FIGS. 3 and 4, between the movable scroll member 41 and the bearing support plate 7, there is an annular fixed thrust plate 53 fixed to the bearing support plate 7, and a movable scroll member. An annular movable-side thrust plate 55 fixed to the back surface of 41 is interposed so as to be in sliding surface contact with each other. Further, a pin 51 is interposed between both thrust plates 53 and 55. As shown in FIG. 3, there are four pins 51 arranged at equal intervals in the circumferential direction.
There are several locations. Further, as shown in FIGS. 5 and 6, the pin 51 consists of a large diameter portion 51a and a small diameter portion 51b, and the small diameter portion 51b has a circular outer shape when viewed from the front.
the center of both so that it protrudes from the front circular outline.
It is formed to be shifted by the same dimension as the eccentricity of the crankshaft 13A. The large diameter portion 51a of each pin 51 is connected to a hole 5 formed in the stationary thrust plate 53.
3a, and the small diameter portion 51b of each pin 51 is fitted into the hole 5 of the movable thrust plate 55.
5a via a metal bearing 56 so as to be rotatable. Therefore, when the crankshaft 13A rotates, the rotation of the movable scroll member 41 is suppressed by the plurality of pins 51 disposed in the circumferential direction. That is, the pin 51, both thrust plates 53, 55, and the metal bearing 56 constitute a rotation prevention mechanism 58.

Further, the fixed side and movable side thrust plates 53.
55, substantially semicircular notches 53b and 55b of the same shape are formed, respectively, as shown in FIGS. 3 and 4. This notch 53b.

55b are formed at four locations at equal intervals in the circumferential direction. In addition, suction boats (refrigerant gas flow passages) 57 communicating with the motor section space 26 are formed at each position of the bearing support plate 7 corresponding to these notches 53b and 55b, and each suction boat 57 is connected to the motor section space 26. , each of both thrust plates 53.5
5 facing the back surface of the movable scroll member 41 through the notches 53b and 55b, and these notches 53b and 55b.
Through 55b, it communicates with a suction pressure chamber 65 of the scroll section in FIG. 1, which will be described later. Therefore, each suction boat 57 can be provided close to the drive shaft 13 so as to communicate with the notches 53b, 55b of both thrust plates 53, 55, so the outer diameter of the bearing support plate 7 can be reduced. This makes it possible to reduce the outer diameter of the compressor itself.

As shown in FIG. 3, the fixed thrust plate 53 and the movable thrust plate 55 are displaced from each other in the rotation direction as the movable scroll member 41 rotates together with the crankshaft 13A. The movable scroll member 41 is in contact over a wide area in the radial direction, making it possible to receive the thrust force acting on the movable scroll member 41 as a small thrust force per unit area. Also,
The refrigerant gas in the motor space 26 flows from each suction bow 1-57 to the notch 53b of both thrust plates 53.55,
55b to the suction pressure chamber 65 of the scroll section, but at this time, the fixed side thrust brake 53 and the movable side thrust plate 55 are misaligned as shown in Figs. 3 and 1, so the fixed side The refrigerant gas that has passed through the notch 53b of the thrust plate 53 collides with a part of the wall of the movable thrust plate 55 due to inertia, and as a result of this collision, mist oil in the refrigerant gas adheres, and the attached oil are the thrust plates 53 and 5 on the fixed side and movable side.
5, and sufficient lubrication is achieved between them.
Both thrust plates 53 and 55, which are in sliding contact with each other and exert a large thrust force, can smoothly slide. Similarly, the refrigerant flowing through the notch 55b of the movable thrust plate 55 collides with the back surface of the movable scroll member 41, and due to the oil adhering to this, the refrigerant further flows between the two thrust plates 53 and 55. As a result, the rotation prevention mechanism 58 is sufficiently lubricated.

The sliding contact surface of the movable thrust plate 55 that comes into sliding contact with the stationary thrust plate is shown in FIGS. 1, 3, and 7.
As shown in Figures (a) and (b), an annular oil groove 55c
is formed. This oil groove 55c is provided so as to communicate with all the notches 55b and the recess 55b into which the pin 51 is fitted, and furthermore, this annular oil groove 55c is communicated with four oil grooves 55d provided in the radial direction. ing.

Therefore, the notches 5 of both thrust plates 53, 55
The oil that enters between them from 3b and 55b lubricates the sliding surfaces of each other through the annular oil groove 55c, and also lubricates the various fitting portions of the pin 51. Furthermore, the oil supplied through the radial oil groove 55d lubricates the space between the crankshaft 13A and the metal bearing 43, which reduces stress at various parts where stress is concentrated. It is possible to ensure a January slip.

In addition, the bearing support plate 7 and the fixed side thrust plate 53
A fan 61 fixed to the drive shaft 13 with screws is provided in a space 59 surrounded by the movable scroll member 41 and the movable scroll member 41 . This fan 61 is installed so that as the drive shaft 13 rotates, air can be blown from the space 59 to the space 26 on the motor 28 side through the gap between the bearings 17 and the like. As a result, the inside of the space 59 becomes negative pressure, and the suction accompanying the negative pressure supplies more lubricating oil between the two thrust plates 53 and 55, thereby improving lubrication.

The movable scroll member 41 supported by the crankshaft 13A is engaged with a fixed scroll member 63 fixed to the upper case 3 with a plurality of bolts 62, for example, as shown in FIGS. 1 and 8. A suction pressure chamber 65 is formed to have a suction pressure, an intermediate pressure chamber 67 is compressed to an intermediate pressure, and a discharge pressure chamber 69 is compressed to a discharge pressure.
A discharge boat 71 is formed in the center of the discharge chamber 9 , and this discharge boat 71 communicates with a discharge chamber 75 via a reed valve 73 . Then, the movable scroll member 41 moves to the fixed scroll member 63 according to the amount of eccentricity of the crankshaft 13A.
Sealed pressure chamber 67.8 formed by sliding and engaging
The volume of the refrigerant 9 is gradually reduced to compress the refrigerant from the suction pressure to the intermediate pressure and further from the intermediate pressure to the discharge pressure, and the refrigerant is discharged from the discharge boat 71. In addition, 76 in the figure indicates a discharge union.

The movable scroll member 41 is provided with extremely small diameter oil holes 77 and 79. One oil hole 77 is
As shown in FIG. 1, one end thereof communicates with the gap between the end face of the crankshaft 13A and the movable scroll member 41, and the other end communicates with the gap between the end face of the crankshaft 13A and the movable scroll member 41, as shown in FIG.
Three types of chambers 65, 67, 69.63 are defined by spiral wrap portions 41A and 63A. Among them, intermediate pressure chamber 67
is connected to. Further, as shown in FIG. 1, the other oil hole 79 has one end connected to the stationary thrust plate 5.
3 and the movable scroll member 41, and the other end thereof communicates with the intermediate pressure chamber 67 as described above.

Also, both of these oil holes 77 and 79 are connected to the intermediate pressure chamber 67.
The position communicating with the fixed side scroll member 63 is selected from the position where the wrap portion 63A of the fixed scroll member 63 communicates with the fixed side scroll member 63 intermittently. The oil adhering to the inner wall surface of the intermediate pressure chamber 67 due to the intermediate pressure of the intermediate pressure chamber 67 passes through the oil hole 77 to the end surface of the crankshaft 13A and the movable scroll member 41.
On the other hand, the oil is intermittently supplied to the gaps between the stationary thrust plate 53, the movable scroll member 41, and the movable thrust plate 55 through the oil holes 79.

Further, an annular oil reservoir 8 is provided on the upper surface of the fixed scroll member 63 that defines the discharge chamber 75 together with the upper case 3.
1 is formed, and this oil reservoir 81 has a discharge chamber 7.
The oil in 5 is collected. On the other hand, a surface 41b of the movable scroll member 41 facing the fixed scroll member 63
An annular oil groove 83 is formed along its periphery, and oil from the inner surface of the suction pressure chamber 75 is stored in this oil groove 83, and this oil allows the tip of the wrap portion 63A to come into sliding contact when the compressor is driven. Surface lubrication takes place.

Further, the oil reservoir 81 is communicated with an oil hole 85 extending to the peripheral edge of the surface of the fixed scroll member C3 facing the movable scroll member 41. This oil hole 8
5 is provided with a check valve 87. In this embodiment, the check valve 87 is constituted by a reed valve that opens the oil hole 85 when the pressure in the discharge chamber 75 is low (below the discharge pressure). Therefore, when the compressor is driven, the oil hole 85 is closed, and when the compressor is stopped, the oil hole 85 is opened, and the oil in the oil reservoir 81 is guided to the suction pressure chamber 75 through the oil hole 85. This supplied oil travels along the wall surface of the lap part 41 and is collected in the oil groove 83, and when the compressor is started, the lap parts 41A, 63
A is lubricated, allowing smooth startup.

Furthermore, by preparing the above-mentioned thrust plates 53 and 55 in various thicknesses, and selecting and assembling the appropriate thrust plates 53 and 55 when assembling the compressor, dimensional errors in machining in the axial direction can be reduced. Even if the shim 9 is present, it can be easily accommodated, the assembly cost can be reduced, and it is also possible to create a structure that does not require the shim 9 described above.

Further, in the above embodiment, the vibrator 37 as shown in FIGS. 1 and 2 was used as the refrigerant flow path for guiding the refrigerant gas of the suction union 35 to the bottom of the case 5, but for example, as shown in FIG. As shown, in the type of electric compressor that has a stator support member 91 for the motor stator 25 inside the case 5, a gap 93 is formed between the support member 91 and the case 5. By interposing an annular stopper 95 above the union 35 and using this gap 93 as a refrigerant flow path, refrigerant gas flows toward the bottom of the case as shown by the arrow in the figure. A similar effect is achieved when the oil at the bottom is turned into a mist.

By providing the thrust plates in sliding contact with each other between the bearing support member and the movable scroll member in this way, only a small thrust force acts on the pins that connect them, thereby preventing damage to the pins. In addition, a union for refrigerant suction is provided between the electric motor of the case and the upper bearing support member, and a refrigerant flow path is provided that communicates with the union and directs the refrigerant gas toward the bottom of the case. As a result, oil is sufficiently mixed into the refrigerant gas, and the one-rotation blocking mechanism can be sufficiently lubricated.

(Effects of the Invention) As explained above, according to the present invention, since the rotation prevention mechanism is constituted by two thrust plates that face each other and a pin that connects these, the case and the movable scroll member are connected to each other. The acting thrust force is received by both thrust plates, reducing the thrust force acting directly on the pin, reducing pin damage and wear, and extending the life of the scroll fluid machine. .

In addition, a union for inhaling refrigerant gas is provided above the motor, and a refrigerant flow path is provided for the refrigerant gas from the union to flow toward the bottom of the case, so that it is possible to promote mist formation of oil at the bottom of the case. Sufficient lubrication of the sliding contact portions of the blocking mechanism and the like can be achieved.

[Brief explanation of the drawing]

1 to 9 relate to one embodiment of the present invention, and FIG.
The figure is a longitudinal cross-sectional view of a scroll fluid machine, Figure 2 is a cross-sectional view taken along the arrow II-II in Figure 1 showing the main parts of the electric motor, and Figure 3 is a cross-sectional view taken along arrow II-II in Figure 1 showing both thrust plates. ■A cross-sectional view in the direction of arrows, Fig. 4 is a partially fragmented perspective view showing the arrangement structure of both thrust plates, Fig. 5 is a side view showing the pin extracted, Fig. 6 is a perspective view of the pin, Fig. 7 Figure (a) is a front view showing the thrust plate, Figure 7 (b) is Figure 7 (a)
Figure 8 is a cross-sectional view taken along arrows ■-■ in Figure 1, showing both scroll members, and Figure 9 shows the mounting structure of the suction union according to another embodiment. FIG. 3.5...Case 7...Bearing support member 13.13A...Drive shaft and crankshaft 28...
Electric motor 35... Suction union 37.93... Refrigerant flow path 41.63... Movable side and fixed side scroll member 5
1...Pin 58...Rotation prevention mechanism Patent applicant: Diesel Kiki Co., Ltd. Patent applicant: Tama Manufacturing Co., Ltd. Patent attorney: Tadashi Mori Figure 7 Figure 9

Claims (1)

[Scope of Claims] An electric motor disposed on the lower side of a sealed case; an upper bearing support member fixed to the case and supporting the upper part of the drive shaft of the electric motor; connected to the drive shaft; a crankshaft that is eccentric to the drive shaft; a fixed scroll member fixed to the upper side of the case; and a movable member that is connected to the crankshaft and moves eccentrically while meshing with the fixed scroll member as the crankshaft is driven. a side scroll member, a rotation prevention mechanism that prevents rotation of the movable scroll member, an annular fixed thrust plate that is fixed to the bearing support member, and a rotation prevention mechanism that is fixed to the movable scroll member. an annular movable thrust plate that is in surface contact with the stationary thrust plate; and a pin that is inserted into holes in both thrust plates, and is provided between the electric motor and the upper bearing support member of the case. A scroll fluid machine comprising: a union for sucking refrigerant gas; and a refrigerant flow path communicating with the union and allowing refrigerant to flow toward the bottom of the case.