JPS6341589Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention involves meshing a pair of spiral bodies at different angles, applying circular orbital motion to one of them, and moving the closed space formed between the spiral bodies to the center of the spiral bodies. The present invention relates to a scroll type compressor that discharges compressed fluid from the center by reducing the volume while moving in the direction.

[Prior art]

A conventional scroll compressor is shown in FIG. Referring to FIG. 1, the fixed scroll member 25 has a spiral body 252 on a side plate 251, and the movable scroll member 26 has a spiral body 262 on a side plate 261. Conventionally, a side plate 251 is provided with a fixed spiral body 252 and a side plate 261 is provided with a movable spiral body 262.
A structure is adopted in which wear-resistant plates 254 and 264 are installed in close contact with one or both of the spiral body walls so as to cover the space between the walls of the spiral body. The wear-resistant plates 254 and 264 are formed from steel or the like. In a scroll compressor having such a structure, the clearance between the tip of the fixed spiral body 252 and the wear-resistant plate 264 and the wear resistance between the tip of the movable spiral body 262 and the wear-resistant plate 264 are initially set by the casing shim 113. The clearance between the plate 254 (hereinafter, these clearances are referred to as axial clearance) is due to the deflection of the side plates 251 and 261 due to the pressure increase in the spiral body during operation, and the thrust ball 281 of the movable scroll rotation prevention mechanism 28. It changes due to the deformation of the axial contact part of the axial contact part and the expansion and contraction of each part due to temperature changes. Here, it is possible to make the side plates 251 and 261 sufficiently thick to prevent their deflection, and to enlarge the thrust ball 281 to prevent deformation at the contact portion, but expansion and contraction of the parts due to temperature changes may be prevented. This cannot be avoided and is a major factor in changing the axial clearance. Note that the movable scroll rotation prevention mechanism 28 is for preventing rotation of the movable scroll member 26 during the circular orbit movement of the movable scroll member 26.

As is clear from the principle of compression of a scroll type compressor, the scroll members 25, 2 during operation.
The temperature of No. 6 is low at the outer periphery that is in contact with the suction gas from the suction port 34, increases toward the center, and reaches its maximum at the discharge port 258.
Therefore, the axial clearance decreases most at the center of the scroll members 25, 26 due to temperature changes associated with operation. For this reason, if the axial clearance at the time of assembly is set small to maintain performance, the tips near the center of the spiral bodies 252 and 262 will come into strong contact with the side plates 261 and 251, causing the spiral bodies 252 and 262 to This has disadvantages in that the tips may suffer abnormal wear and excessive force may be applied to the roots of the spiral bodies 252 and 262.

In addition, in FIG. 1, the compressor housing 10
is composed of a front end plate 11, a cup-shaped portion 12, the above-mentioned casing shim 113, and the like. 35 is a discharge port.
The pulley 22, electromagnet 23, and armature plate 24 constitute an electromagnetic clutch, which allows the rotation of an external drive source (for example, an automobile engine) to be transferred to the pulley 22 through a belt.
By energizing the electromagnet 23, the armature plate 24 is attracted to the pulley 22, thereby transmitting the rotational force to the main shaft 13. This rotational force of the main shaft 13 is transmitted to the movable scroll drive mechanism 27. The movable scroll drive mechanism 27 has a drive wheel 271, a radial bearing 272, etc., and the movable scroll member 26 is configured to provide circular orbital motion to the movable scroll member 26.
is combined with

[Purpose of invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks and prevent abnormal wear of the tips near the center of the pair of spiral bodies caused by the temperature rise in the center of the pair of scroll members. An object of the present invention is to provide a scroll compressor that can prevent excessive force from working.

[Structure of the idea]

According to the present invention, a pair of scroll members each having a spiral body provided on a side plate are stacked one on top of the other so that both spiral bodies are angularly shifted and engage with each other, and one scroll member is stacked against the other scroll member. The fluid pocket formed between the two spiral bodies is moved toward the center of the two spiral bodies by the relative circular orbital movement of the fluid pocket, thereby reducing the volume of the fluid pocket and compressing the fluid. In the scroll compressor, at least one of the scroll members has a wear-resistant plate disposed on a side plate on which the spiral body is provided so as to cover between the walls of the spiral body. In the scroll compressor, a step is provided in the center of the side plate surface on which the wear-resistant plate is arranged in a direction that reduces the thickness of the side plate, and a gap is formed between the side plate and the wear-resistant plate. A scroll compressor is obtained.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 2, in one embodiment of the present invention, a side plate 25 is placed in the center of the side plates 251 and 261 on which wear-resistant plates 254 and 264 made of steel are arranged.
25 steps in the direction of decreasing the plate thickness of 1,261
3 and 263, and a pocket is formed in which a minute gap can be set between the wear-resistant plates 254 and 264. The above step difference will be explained in detail with reference to FIGS. 3 and 4.

3A and 3B are a front view and a sectional view of the fixed scroll member 25, respectively. A step 253 shown with a dot is formed at the center of the side plate 251. This step 253 is formed from the discharge port 258 to an arbitrary position along the surface of the side plate 251 between the fixed spiral body 252. Such a step 2
53 can be easily machined with a tool such as an end mill, and its depth t can be controlled with high precision. Extremely small depth t if necessary
It is also possible to set

Figure 4 shows the fixed scroll member 2 shown in Figure 3.
5 shows a state in which a wear-resistant plate 254 is combined. As is clear from FIG. 4B, a gap or pocket is formed between the step 253 and the wear-resistant plate 254.

The reason why the fixed scroll member 25 expands particularly greatly in the axial direction due to the temperature rise associated with operation is when the fixed scroll member 25 expands in the vicinity of the center of the spiral bodies 252 and 262 of the movable scroll member 26 (252a and 26 in FIGS. 2 and 3).
2a), a step 263 or 253 shown in FIG. 2 is provided on the side plate 261 or 251 corresponding to that portion, and a pocket is formed between the side plate 264 or 254 and the wear-resistant plate 264 or 254. In the scroll type compressor shown in FIG. 2, when the vicinity of the center of the spiral bodies 252, 262 expands in the axial direction due to temperature rise with the axial clearance set to a minute value, the side plate 26
1,251 has wear-resistant plates 264, 25 in the center.
Since a pocket is formed between the spiral bodies 252 and 262, the central portions 252a and 2
Depending on the amount of axial expansion of the wear-resistant plate 26
4,254 is deflected. The depth of these pockets t
The spiral bodies 252, 262 that may occur during operation
By setting the maximum axial expansion amount of the central portions 252a, 262a, the amount of axial expansion in any state can be absorbed by the bending of the wear-resistant plates 264, 254. Wear-resistant plate 264,2
Spiral body 25 created by bending of 54
Since the reaction force received by the center portions 252a, 262a of the spiral bodies 252, 262 is minute, the spiral bodies 252, 262
Only a slight force is applied to the tips of the center portions 252a, 262a of the coils 262, which prevents abnormal wear of the tips, and also prevents excessive force from acting on the roots of the spiral bodies 252, 262. can. Furthermore, if the depth t of the pocket is very small, the lubricating oil will enter the gap and there is no need to worry about blow-by.

[Effect of idea]

As explained above, according to the present invention, abnormal wear of the tips near the center of the pair of spiral bodies, which occurs due to temperature rise in the center of the pair of scroll members, and excessive wear on the roots of the pair of spiral bodies, A scroll compressor that can prevent the application of excessive force can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional structural diagram of a conventional scroll compressor, FIG. 2 is a cross-sectional structural diagram of an embodiment of the present invention, and FIGS. 3 A and B are the fixed scroll member 25 of FIG.
FIGS. 4A and 4B are a front view and a sectional view of a state in which the fixed scroll member 25 of FIG. 2 and the wear-resistant plate 254 are combined. 10...Compressor housing, 11...Front end plate, 12...Cup-shaped portion, 13...
...Main shaft, 25...Fixed scroll member, 251...
...Side plate, 252...Fixed spiral body, 252a...
...A portion near the center of the fixed spiral body 252, 253...
...Step, 254... Wear-resistant plate, 258... Discharge port, 26... Movable scroll member, 261...
Side plate, 262... Movable spiral body, 262a...
Near the center of the movable spiral body 262, 263...
Step, 264... Wear-resistant plate, 27... Movable scroll drive mechanism, 28... Rotation prevention mechanism.

Claims (1)

[Scope of utility model registration request] A pair of scroll members each having a spiral body provided on a side plate are stacked one on top of the other so that both spiral bodies are angularly shifted and mesh with each other, and the relative circular orbit of one scroll member with respect to the other scroll member is determined. Scroll-type compression in which the fluid pocket formed between the two spiral bodies is moved toward the center of the two spiral bodies by the motion, thereby reducing the volume of the fluid pocket and compressing the fluid. In a scroll type compressor, at least one of the scroll members has a wear-resistant plate disposed on a side plate on which the spiral body is provided so as to cover between the walls of the spiral body, A scroll characterized in that a step is provided in the center of the side plate surface on which the wear-resistant plate is arranged in a direction that reduces the thickness of the side plate, and a gap is formed between the side plate and the wear-resistant plate. mold compressor.