JPH01290982A - Scroll type hydraulic machine - Google Patents

Abstract

PURPOSE:To reduce the outer diameter dimension by arranging a thrust plate between a bearing support member and a movable side scroll member and making semi-circular notch sections in both thrust plates thereby providing a refrigerant gas flow path in the center. CONSTITUTION:Pins 51 are provided to fixed side and movable side thrust plates 53, 55. When a crankshaft 13A rotates, rotation of a movable side scroll member 41 is suppressed through a plurality of pins 51 arranged in the circumferential direction. Approximately semi-circular notches 53b, 55b are made respectively in the fixed side and movable side thrust plates 53, 55.

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 scroll 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 the cold tofu gas is compressed in the number of compression chambers formed between the fixed scroll members 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 1 for guiding the eccentric movement of the balls (for example, Japanese Patent Publication No. 60-22199).

(Problem B to be solved by the invention) However, in the electric compressor using the above-mentioned ball bearing rotation prevention mechanism, each thrust plate simply guides the balls, and the case side and movable scroll Because each ball itself directly receives the thrust force that acts between it and the member due to point contact, each ball wears out significantly, making it difficult to ensure smooth movement of the bearing part. .

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 reduces the thrust force that acts directly on the pin, prevents pin damage and wear, and reduces the outer diameter of the pin.

(Means for Solving the Problems) A scroll fluid machine of the present invention includes, in a sealed case, an electric motor, a bearing support member fixed to the case and supporting an upper part of the drive shaft of the electric motor, and the drive shaft. a crankshaft that is eccentric with respect to the drive shaft; a fixed scroll member that is fixed to the case; and a fixed scroll member that is coupled to the crankshaft and moves eccentrically while meshing with the fixed scroll member as the crankshaft is driven. a rotation prevention mechanism that prevents rotation of the movable scroll member; and a flow passage provided in the bearing support member that allows refrigerant gas to flow from the electric motor side to the scroll member side; The rotation prevention mechanism includes an annular fixed thrust plate fixed to the bearing support member, and 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 a hole in both of the thrust plates, and a substantially semicircular notch is provided in a position corresponding to a flow path provided in the bearing support member of both thrust plates. has been done.

(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 a compression chamber formed between both scroll members.

The refrigerant gas flows from the electric motor side through the flow path to both scroll members through the notches of both thrust brakes l-. Further, in this case, 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 that connects them. Therefore, damage and wear on the pins are reduced, and by providing notches in both thrust plates, the refrigerant gas flow path can be placed closer to the drive shaft, reducing the overall diameter. I can figure it out.

(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 by a plurality of bolts 11 with a bearing support plate 7 and a shim 9 interposed therebetween 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 cases 3 and 5, and the lower part of the drive shaft 13 is connected to the lower case 5 through a bearing 15.
The upper part of the drive shaft 13 is supported by the bearing member 7 via a bearing 17. In addition, 19 in the figure is a stopper ring 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.
is 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.
It 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, the refrigerant gas is guided from the union 35 to the space 39 between the salient poles 25a through the vibrator 37, as shown by the arrow in FIG. 1, and the stator 25 and the coil 27 are cooled. 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, reaches the upper part, and then returns to the motor 2.
8 cooling is performed. 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.

On the upper end side of the drive shaft 13, as shown in FIG. 1, a crankshaft 13A is formed with a center 02 eccentric from the center 01 of the drive shaft 13 by a predetermined dimension.

The crankshaft 13A is inserted through a metal bearing 43 into a connecting insertion portion 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. Furthermore, 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 1
A balance weight 45 is attached to a screw 47 below the bearing 17 of No. 3.
It is fixed by.

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 rear 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.
It is located in several places. 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 centers of both are shifted by the same dimension as the eccentricity of the crankshaft 13A so as to protrude from the front circular outer shape of the crankshaft 13A. The large diameter portion 51a of each pin 51 is
Hole 53 formed in the stationary thrust plate 53
a, and the small diameter portion 51b of each pin 51 is fitted into the hole 55 of the movable thrust plate 55.
a through a metal bearing 56 so as to be rotatable. Therefore, when the crankshaft 13A turns, the rotation of the movable scroll member 41 is suppressed by the plurality of pins 51 arranged in the circumferential direction. That is, pin 5
1. Both thrust plates 53, 55 and metal bearings 56 constitute a rotation prevention mechanism.

In addition, 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. Further, at each position of the bearing support plate 7 corresponding to these notches 53b and 55b, a suction boat (refrigerant gas flow path) 57 communicating with the motor section space 26 is formed. , respectively, both thrust plays F.53.
The notches 53b and ssb of the thrust plates 55 communicate with the suction pressure chamber 65 of the scroll section in FIG. 1, which will be described later.
Since each suction bow (57) can be provided close to the drive shaft 13 so as to communicate with the bearing support plate 7, the outer diameter of the bearing support plate 7 can be reduced. The outer diameter of itself can be reduced.

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 is transferred from each suction boat 57 to the notch 53b of both thrust brakes 1"53.55,
55b to the suction pressure chamber 65 of the scroll portion, but at this time, the fixed thrust plate 53 and the movable thrust plate 55 are misaligned as shown in FIGS. 3 and 1, so the fixed thrust plate 53 ...The refrigerant gas that has passed through the notch 53b of the 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 this adhered Oil flows into the gap between the thrust plates 53 and 55 on the fixed side and the movable side, lubrication is performed between them, and both thrust plates 53 and 55 that are in sliding contact with each other can smoothly slide. Similarly, the refrigerant flowing through the notch 55b of the movable thrust plate 55 also flows through the movable scroll member 4.
The oil that adheres to the rear surface of the thrust brake 1 flows further between the thrust brakes 53 and 55 of both thrust brakes for lubrication.

As shown in FIGS. 1, 3, and 7(a), (b), an annular oil groove 55 is formed on the sliding surface of the movable thrust plate 55 that comes into sliding contact with the fixed thrust plate.
c is formed. This oil groove 55C has all the above-mentioned notches 55b and a recess 55b into which the pin 51 is fitted.
Furthermore, this annular oil groove 55c communicates with four oil grooves 55d provided in the radial direction.

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, thereby ensuring lubrication of each part where stress is concentrated.

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 . The fan 61 is installed so that as the drive shaft 13 rotates, air can be blown from the space 59 into the space 26 on the motor 28 side through the gap between the bearings 17 and the like. 59 becomes negative pressure, and the suction accompanying the negative pressure supplies more lubricating oil between the above-mentioned 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 67.6 formed by sliding and engaging
By gradually reducing the volume of the refrigerant 9, the refrigerant is compressed from the suction pressure to the intermediate pressure and then from the intermediate pressure to the discharge pressure, and is discharged from the discharge boat 7J. 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 both scroll members 41 as shown in FIG.
．． Three types of chambers 65, 67, 69 . 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. Then, 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 is transferred to the end surface of the crankshaft 13A and the movable scroll member 41 through the oil hole 77.
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 in this oil reservoir 81, and a discharge chamber 7 is formed in this oil reservoir 81.
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 on the inner surface of the suction pressure chamber 75 is stored in this oil groove 83. When the compressor is driven, the tip of the wrap portion 63A comes into sliding contact with the oil groove 83. 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 63 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.

In addition, by preparing both the above-mentioned thrust plates 53 and 55 with various plate 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 avoided. It is also possible to easily accommodate the above-mentioned configuration, reduce assembly costs, and create a structure that does not require the shim 9 described above.

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. Furthermore, by providing semicircular notches in both thrust plates, the refrigerant gas flow passage can be provided at the center, and the outer diameter can be reduced.

(Effects of the Invention) As explained above, according to the present invention, since the rotation prevention mechanism is constituted by two thrust plates facing each other and a pin connecting these, the case and the movable scroll member are The thrust force acting on the pin is received by both thrust plates, which reduces the thrust force acting directly on the pin, reduces pin damage and wear, and extends the life of the electric compressor. I can do it. Also,
Since both thrust plates are provided with substantially semicircular notches, the refrigerant gas flow path provided in the bearing support member can be formed close to the drive shaft, and the overall outer diameter can be reduced.

[Brief explanation of the drawing]

1 to 8 relate to one embodiment of the present invention, and FIG.
The figure is a vertical cross-sectional view of the scroll fluid machine, and Figure 2 is II-I in Figure 1 showing the main parts of the electric motor. 3 is a sectional view taken along the line m-■ in FIG. 3 showing both thrust plates; FIG. 4 is a partially fragmented perspective view showing the arrangement structure of both thrust plates; FIG. The figure is a side view showing the extracted pin, Figure 6 is a perspective view of the pin, Figure 7 (a) is a front view showing the thrust plate, and Figure 7 (b) is Figure 7 (a).
FIG. 8 is a cross-sectional view taken along the line ■--■ in FIG. 1 showing both scroll members. 3.5...Case 7...Bearing support member 13.13A...Drive shaft and crankshaft 28...
Electric motor 41.63...Movable side and fixed side scroll member 5
1... Pin 53b... Notch 55b of fixed side thrust plate.
...Notch 57 of movable thrust plate...Flow passage 58...Rotation prevention mechanism Fig. 2. Brush 3 Dark Figure 5 Figure 6 M7

Claims (1)

[Scope of Claims] An electric motor, a bearing support member fixed to the case and supporting the upper part of the drive shaft of the electric motor, and a crank connected to the drive shaft and eccentric to the drive shaft. a shaft; a fixed scroll member fixed to the case; a movable scroll member that is connected to the crankshaft and moves eccentrically while meshing with the fixed scroll member as the crankshaft is driven; and the movable scroll member. a rotation prevention mechanism that prevents rotation of the member; and a flow passage provided in the bearing support member that allows refrigerant gas to flow from the electric motor side to the scroll member side; an annular fixed-side thrust plate fixed to the support member; an annular movable-side thrust plate fixed to the movable-side scroll member and in surface contact with the fixed-side thrust plate; 1. A scroll fluid machine comprising: a pin; and a substantially semicircular notch is provided at a position corresponding to a flow passage provided in the bearing support member of the thrust plate.