JPH0286976A - Scroll hydraulic machine - Google Patents

Abstract

PURPOSE:To aim at the secureness or the like of sealability by installing an elastic member, giving some preload to a movable side scroll member toward the turning outward, in space between a crankshaft and this movable side scroll member via a sleeve, and installing an engaged projection, projecting annularly toward the radial inward, in this sleeve. CONSTITUTION:A crankshaft 43 is inserted into a connecting part 45a formed at the backside of a movable side scroll member 45 via an inner sleeve 47, an elastic member 49 and an outer sleeve 51. Then, this inner sleeve 47 is displaced outward and assembled whereby an outward part of the elastic member 49 is compressed in the radial direction, and thereby preload F1 for the radial outward is given to the movable side scroll member 45. In addition, in a lower end of the outer sleeve 51, there is provided with an engaged projection 51a toward the inner sleeve 47.

Description

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

(Prior art) As a conventional scroll fluid machine, Japanese Patent Application Laid-Open No. 59-103
There is one described in Publication No. 979.

This type of scroll fluid machine includes a crankshaft that moves eccentrically by a drive source, and a movable scroll member that moves eccentrically while meshing with a fixed scroll member by driving the crankshaft connected to the crankshaft. The movable scroll member is divided into a scroll member and a crankshaft fitting portion, and the shaft fitting portion is coupled to the scroll portion through an elastic body.

When the crankshaft is driven, the movable scroll member is moved at a radius larger than the eccentric radius of the crankshaft due to the action of centrifugal force. The sealing performance is obtained.

(Problems to be Solved by the Invention) However, in the above conventional scroll fluid machine,
Although sealing performance can be obtained when the crankshaft is operated at high speed, there is a problem in that when the crankshaft is operating at low speed, centrifugal force hardly acts and sealing performance cannot be expected. Also,
During high-speed operation, as the sealing performance increases in proportion to the centrifugal force, there is a risk that the wear of the scroll parts that slide against each other will increase. Furthermore, since the movable scroll member must be divided, there is a drawback that the structure becomes complicated and processing costs increase.

Therefore, in the present invention, the above-mentioned problems are solved by interposing an elastic member between the drive shaft and the crankshaft with a preload applied thereto, and by providing a structure that limits the deformation of the elastic member. It is an object.

(Means for Solving the Problems) A scroll fluid machine of the present invention includes an electric motor, a support block fixed to the case and supporting a drive shaft of the electric motor, and a support block connected to the drive shaft in a sealed case. A crankshaft that is eccentric with respect to the drive shaft, a fixed scroll member fixed to the support block, and a fixed scroll member that is connected to the crankshaft and engages with the fixed scroll member as the crankshaft is driven and performs eccentric movement to reduce the intake pressure. a movable scroll member defining a chamber, an intermediate pressure chamber, and a discharge pressure chamber;
A scroll fluid machine comprising: an elastic member disposed between the crankshaft and the movable scroll member via a sleeve to apply a preload to the movable scroll member toward the outside of the rotation; It is configured with a locking protrusion that protrudes radially inward in an annular shape.

(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.

In this case, during assembly, the movable scroll member is preloaded radially outward by an elastic member, so that the movable scroll member is urged outward during break-in operation. The wrap portion of the movable scroll member and the wrap portion of the stationary scroll member are appropriately worn by sliding contact, and the sealing performance between them is improved. During normal operation, the locking protrusion of the sleeve comes into contact with the circumferential surface of the crankshaft, the preload of the elastic member is not applied above a predetermined value, and sealing performance is ensured mainly by the action of centrifugal force.

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

FIG. 1 shows a scroll fluid machine 1 (a scroll type hermetic electric compressor), in which numerals 3, 5, and 7 are an upper case, an intermediate case, and a lower case, and 9 is a support block. The upper case 3, middle case 5, and lower case 7 are integrally connected to each other so that the inside thereof is sealed. A drive shaft 11 is disposed vertically within the case 3, 5.7, and the middle portion of the drive shaft 11 is supported by the support block 9 via bearings 13 and 15.

A columnar rotor 17 made of a laminated iron core is fixed to the lower end of the drive shaft 11, and permanent magnets 19 are attached to the circumferential surface of the rotor 17, which sequentially constitute N and S poles.

Further, a cylindrical stator 21 made of a laminated iron core is disposed around the outer periphery of the permanent magnet 19, and this stator 21 is fixed to a support member 25 fixed to the support block 9 with bolts 23. An excitation coil 27 is wound around each salient pole 21a of the stator 21, and a brushless electric motor 29 is constituted by these coils. A lead wire (not shown) is connected to the excitation coil 27, and the lead wire is drawn out of the case 5. Note that 31 is a Hall element that detects the number of rotations of the rotor 21, and is fixed to the support member 25 with bolts 33 and is supported by the member 35.

A suction union 37 is fixed to the upper side of the stator 21 through the case 5, and a suction pipe (not shown) is connected to this union 37 to suck refrigerant. The union 37 communicates with a plurality of annular passages 9a formed in the support block 9. The annular passage 9a is a support block 9
A motor space 39 formed above the motor 29 by
are communicated with each other via a plurality of communication passages 9b.

Therefore, as shown by the arrow in FIG. 1, the refrigerant gas reaches the space 39 from the union 37 through the annular passage 9a and the communication passage 9b, and is led to the lower part of the electric motor 29 through the space between the salient poles 21a. Stator 21 and coil 2
7 cooling is performed. Furthermore, the refrigerant gas that has passed through the electric motor 29 passes through an oil separation plate 41 provided at the bottom of the lower case 7.
The space 42 between the case 5 and the support block 9
and reaches upward through a plurality of communication passages 9C provided in the support block 9.

As shown in FIG.
A crankshaft 43 having an eccentric position is integrally formed. The eccentricity of the crankshaft 43 is slightly larger than the maximum eccentricity of the movable scroll member 45, which will be described later. Further, the crankshaft 43 is inserted into a connecting portion 45a formed on the back side of the movable scroll member 45 via an inner sleeve 47, an elastic member 49, and an outer sleeve 51. The inner sleeve 47 and the outer sleeve 51 are formed into concentric cylindrical shapes, as shown in the enlarged view of FIG.
1, an elastic member 49 made of rubber or the like is integrally formed by baking. The inner sleeve 47 is press-fitted onto the crankshaft 43, and the outer sleeve 51 is inserted into the movable scroll member 45 so as to be relatively rotatable. The inner sleeve 47 and the outer sleeve 51 are concentric when assembled, but because the eccentricity of the crankshaft 43 is slightly large, the assembly sometimes takes place as shown in FIG.
The inner sleeve 47 is displaced outward and assembled, and the outer portion 49a of the elastic member 49 is assembled in a radially compressed state. Therefore, when the movable scroll member 45 is assembled, the preload F is applied radially outward.
1 is given. Furthermore, a locking protrusion 51a is provided at the lower end of the outer sleeve 51 toward the inner sleeve 47. During normal operation of the crankshaft 43, the locking protrusion 51a comes into contact with the inner sleeve 47 to prevent the elastic member 49 of the outer portion 49a from being excessively compressed. Then, due to the rotation of the drive shaft 11, the crankshaft 4
3 rotates, and accordingly, the movable scroll member 45 is driven to rotate, and the refrigerant is compressed within the compression chamber formed between the movable scroll member 45 and the fixed scroll member 71.

An oil chamber (not shown) is formed in the crankshaft 43, and an oil passage 11a formed in the axial direction of the drive shaft 11 is communicated with the oil chamber. An oil pump 55 is attached to supply oil from the oil reservoir 53 to the oil passage 11a, and the oil is supplied by centrifugal force caused by eccentric movement of the crankshaft 43.

The oil in this oil chamber is supplied to the inner sleeve 45 and outer sleeve 51 through oil holes formed in the radial direction of the crankshaft 43, thereby lubricating the sliding contact portions thereof.

An annular Oldham joint 57 is interposed between the movable scroll member 45 and the support block 9. That is, the Oldham joint 57 is connected to the support block 9
a fixed side plate 61 fixed to by bolts 59;
It consists of a movable side plate 65 fixed to the back side of the movable side scroll member 45 by bolts 63, and an intermediate plate 67 provided between these. It is slidably fitted into each groove formed in the fixed side and movable side plates 61 and 65, and slidably contacts the movable side scroll member 45 while being variable in the direction of the turning radius.

This Oldham joint 57 allows the movable scroll member 45 to
A rotation prevention mechanism is configured.

As the movable scroll member 45 rotates, the intermediate plate 67 and the movable plate 65 slide in the rotating direction relative to the fixed plate 61 and are displaced. 61,65.67
are in contact with each other over a wide area in the radial direction, making it possible to receive the thrust force acting on the movable scroll member 45 as a small thrust force per unit area.

The wrap 45A of the movable scroll member 45 supported by the crankshaft 43 meshes with the wrap portion 71A of the fixed scroll member 71 fixed to the support block 9 with a plurality of bolts 69. For example, as shown in FIG. and the fourth
As shown in the figure, a suction pressure chamber 73 is formed to have a suction pressure, an intermediate pressure chamber 75 is compressed to an intermediate pressure, and a discharge pressure chamber 77 is compressed to a discharge pressure. A discharge boat 79 is formed, and this discharge boat 79 is connected to the discharge chamber 81.
is connected to. Then, the movable scroll member 45 slides on the fixed scroll member 71 in accordance with the eccentric movement of the crankshaft 43, gradually reducing the volume of the intermediate/discharge pressure chambers 75, 77 formed by the IIIfi engagement. , 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 79. In addition, 83 in the figure
82.84 indicates a discharge union, and 82.84 indicates a balance weight.

According to such a scroll fluid machine 1, since the crankshaft 43 is formed to be slightly larger than the turning radius of the movable scroll 45, the crankshaft 43 and the elastic member 4
9 etc. are sometimes assembled using the elastic member 4 as shown in FIG.
The outer portion 49a of 9 is inserted in a compressed state compared to the inner portion 49b, and due to the biasing force of the compressed elastic member 49, a preload of Fl is applied radially outward to the movable scroll member 45. Granted in advance.

When the electric motor 29 is driven in this state to perform a break-in operation, the wrap 45 of the movable scroll member 45 is
A and the wrap 71A of the stationary scroll member 71 are in sliding contact with each other during mating, and when they are worn out and a predetermined amount of wear progresses, the locking protrusion 51a of the outer sleeve 51
The inner part of the inner sleeve 47 contacts the inner sleeve 47, and almost no outward pressing force is applied by the elastic member 49a of the outer part. That is, as shown in FIG. 5, at point A during assembly, a preload F1 is applied to the movable scroll member 45 by the elastic member 49 toward the outside, and in this case, the preload F1 is applied to the movable scroll member 45 by the elastic member 49 on the inner side. The dimension is Lo. When the sliding surfaces of both lap parts 45A and 71A are worn out by the break-in operation, the dimension of the inner elastic member 49b becomes F2 at point B, and the locking protrusion 51a is attached to the inner sleeve 47. abutting,
The displacement of the outer elastic member 49a is regulated, and the pressing force of the outer elastic member 49a against the movable scroll member 45 is maintained at F2. Therefore, during the break-in operation, both the wrap portions 45A and 71A are moderately worn, which improves the break-in and improves the sealing performance during normal operation. In addition, even if liquid compression occurs in the refrigeration cycle during normal operation, the locking protrusion 5 on the outer part
Since 1a is brought into contact with the inner sleeve 47, it is possible to prevent an adverse effect on the elastic member 49 due to liquid compression.

Furthermore, since the crankshaft 43 and the movable scroll member 45 are connected via the elastic member 49, these radial machining errors can be absorbed, and there is no need to increase the machining accuracy so much, making the machining work easier. Since the turning radius is simply changed, it can be constructed with a simple structure.

In the above embodiment, a case has been described in which the inner sleeve 47 is fitted onto the crankshaft 43, but the invention is not limited to this, and the inner sleeve 47 may be mounted so as not to rotate relative to each other by a spline connection or a key and a keyway. Furthermore, instead of the cylindrical elastic member 49, as shown in FIG. 6, at least two upper and lower O-rings 91 and 93 may be used.
In order to adjust the eccentricity of the rings 91, 93, it is also possible to form annular grooves 85, 87 of different depths in the inner and outer parts of the inner sleeve 47.

Furthermore, although the elastic member was provided using an inner sleeve in the above-mentioned embodiment, as shown in Fig. 7, the elastic member can also be baked directly onto the crankshaft, eliminating the need for an inner sleeve and reducing the number of parts. can be achieved.

Further, by subjecting the scroll wrap portion to a surface treatment that provides good initial conformability, the effects of the present invention can be further exhibited.

(Effects of the Invention) As explained above, according to the present invention, since the elastic member is interposed between the crankshaft and the movable scroll member,
These radial machining errors can be absorbed, the configuration becomes simple, and the machining work becomes easy. Furthermore, since a preload is applied to the movable scroll member on the outer side of the rotation during assembly, the sealing performance between both scroll members can be improved through a break-in operation. Furthermore, since the outer sleeve is provided with a locking protrusion directed inward, it is possible to prevent adverse effects caused by liquid compression.

[Brief explanation of the drawing]

1 to 5 relate to one embodiment of the present invention, and FIG.
The figure is a longitudinal sectional view of the scroll fluid machine, FIG. 2 is a longitudinal sectional view explaining the relationship between the crankshaft and the movable scroll member, FIG. 3 is a longitudinal sectional view showing the interposed state of the elastic member, and FIG. 4 IV-IV in FIG. 1 showing both scroll members
FIG. 5 is a cross-sectional view taken in the direction of arrows, and FIG. 5 shows the relationship between the amount of displacement and pressing force of the elastic member. FIGS. 6 and 7 are longitudinal cross-sectional views showing other aspects of the elastic member. 3.5.7...Case 9...Support block 11.43...Drive shaft and crankshaft 29...Electric motor 45.71...Movable side and fixed side scroll member 4
7.91.93...Elastic member 51...Sleeve 51a...Latching protrusion 57...Rotation prevention mechanism Patent applicant Diesel Kiki Co., Ltd. Patent applicant Tama Manufacturing Co., Ltd. Representative Patent attorney Tadashi Mori

Claims (1)

[Scope of Claims] An electric motor, a support block fixed to the case and supporting a drive shaft of the electric motor, and a crankshaft connected to the drive shaft and eccentric to the drive shaft;
A fixed scroll member fixed to the support block is connected to the crankshaft and moves eccentrically while meshing with the fixed scroll member as the crankshaft is driven to control an intake pressure chamber, an intermediate pressure chamber, and a discharge pressure chamber. A scroll fluid machine comprising a movable scroll member that defines a movable scroll member, wherein an elastic member is provided between the crankshaft and the movable scroll member via a sleeve to apply a preload to the movable scroll member toward the outside of the revolution. 1. A scroll fluid machine characterized in that a locking protrusion is provided on the sleeve and protrudes radially inward in an annular shape.