JPS58200092A - scroll fluid machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to scroll fluid machines such as scroll compressors, scroll expanders, and scroll pumps.

1 and 2 show a conventional scroll fluid machine. The stationary scroll member 1 consists of an end plate 1m and a wrap 1b standing upright thereon. It consists of an orbiting scroll member 2ri, an end plate 2a similar to the stationary scroll member 1, and a wrap 2b. The wraps 1b and 2b of both the scroll members 1 and 2 are formed as involutes or curves similar to this, and have a uniform thickness and a uniform height.

A boat 3 is located at the center of the end plate 1a of the stationary scroll member 1.
is provided, and another boat 4 is provided on the outer peripheral side. The boat 3 is a discharge boat in the case of a compressor, and an inflow boat in the case of an expander.

Boat 4I/'i, in the case of a compressor, becomes an intake boat, and in the case of an expander, it becomes a discharge boat.

A scroll pin 2C is provided to protrude from the back surface of the orbiting scroll member 2.

The two scroll members 1.2 are interlocked with their laps lb, 2bl inside each other. In this state, each lap is lb
, 2b's winding ends 1b/, 2b/ are 1 to each other.
It is located 80 degrees apart.

The frame 5 is fixed to the outer periphery of the end plate of the stationary scroll member l with several bolts.

The crankshaft 6 has two bearings 7 attached to the frame 5,
8 on the frame 5.

An a1 balance weight 9 is integrally formed with this crank lIl]6. The parasi weight 9ri may be separate from the crankshaft 6.

A boss hole 1O is formed in the head of the crankshaft 6. The boss hole 10 has its center at a position offset by a distance 6 from the center of the crankshaft 6, and the scroll pin 2c is fitted into the boss hole 10. A needle bearing 11 is provided between the boss hole 10 and the scroll pin 2c.

Rotation prevention member 12t'i End plate 2 of orbiting scroll member 2
It is provided between the back surface of a and the frame 5. The rotation prevention member 12 is ring-shaped and has a straight line m (not shown) on a surface facing the end plate 2a and a surface facing the frame 5. The grooves provided on the surface facing the frame 5 are orthogonal to the grooves provided on the surface facing the end plate 2a. The Oldham keys 138, 13b fixed to the frame 5 are fitted into the grooves provided on the surface facing the frame, and the end plates 2a are fitted into the grooves formed on the surface facing the end plate 2a.
Oldham keys 13c and 13d (see Fig. 3) fixed to are fitted.

The mechanical seal 14 is provided at a portion where the crankshaft 6 passes through the frame 5 and projects to the outside, and is housed in a seal housing 15. This mechanical seal 1
4ri is used, so a description of the configuration will be omitted.

When the crankshaft 6 is rotated clockwise in FIG. 1 by a prime mover (not shown), the orbiting scroll member 2
rotates clockwise without changing its attitude relative to the stationary scroll member 1 (apparently not rotating). As a result, both scroll members l.

The sealed space Vl + v2 formed between the two compresses the volume of the sealed space V,,v, while rotating clockwise, compresses the fluid taken in from the boat 4, and discharges it from the bolt 3.

Conversely, when the orbiting scroll member 2 rotates counterclockwise, the closed space V1. The volume of V2 gradually increases as it rotates in the opposite manner to the above, and the high temperature and high pressure (
The gas (which is at high temperature and pressure relative to what is being discharged from the boat 4) expands and is discharged from the boat 4. At this time, power is generated in the crankshaft 6. Set the number of inumaki rolls to 1.5,
If the closed space does not change its volume, it becomes a pump.

In such a configuration, when manufacturing the fixed scroll member 1 and the orbiting scroll member 2, high precision is required for machining the bottom surface between the laps, resulting in a problem of increased manufacturing cost.

An object of the present invention is to provide a scroll fluid machine in which when a spiral plate is inserted into the bottom between the wraps as a sealing means for a scroll wrap, the spiral plate is pressed with an appropriate force against the mating wrap end mK, and the fluid loss and mechanical loss are small. The purpose is to

A spiral plate is inserted into the bottom surface between the laps, and a passage is provided to connect the space sandwiched between the bottom surface between the wraps and the spiral plate, and the fluid-fluid hyperactive space formed by the two meshed laps. Appropriate fluid pressure is applied to the surface so that the surface of the spiral plate and the tip of the mating wrap always slide, thereby sealing the fluid leaking in the radial direction from the tip of the wrap.

Since there is no easy processing method for finishing the bottom surface of scroll wrap, the bottom surface of scroll wrap has poor flatness and surface roughness.
There was a demand for the invention of a sealing means with good performance. For this C, if a spiral plate with the same shape as the bottom surface between the wraps is made separately, inserted into the bottom between the wraps, and further raised from the wrap n1li surface so that it makes <K contact with the tip of the other wrap, the wrap Sealing of the fluid movement space can be achieved regardless of the flatness or roughness of the bottom surface.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 15. An embodiment of the present invention is shown in FIG. 4, FIG. 5, and FIG. 6. A spiral plate 16 is inserted into the bottom surface between the laps of the fixed scroll 1, and a spiral plate 20 is inserted into the bottom surface between the laps of the orbiting scroll 2. When machining laps, there is no easy means to grind the bottom surface between the laps, so the bottom surface between the laps has greater flatness and surface roughness than the tip of the lap. There is a gap between the two. Therefore, a space 17 is created between the stationary scroll 1 and the spiral plate 16, and a space 21 is created between the orbiting scroll 2 and the spiral plate 20. Spaces 17 and 21 rt spread over the entire spiral plate, for example, space 17 Fi is the beginning of winding 1 of the spiral plate.
It is distributed along the spiral from 6P to the end of winding 169. Space 17°21 and fluid movement space (closed space V, , V,
A passage is provided between the discharge space Vd) and the discharge space Vd), and these fluids are guided to the spaces i...17 and 21. In this way, fluid pressure is applied to the front and back surfaces of the spiral plate 1620, and the sum of the fluid pressures applied from the space 17 to the back surface of the spiral plate 16 is the fluid movement space vl, VB
, if the sum of the fluid pressures applied from Va to the surface of the spiral plate is also greater than the tip of the spiral plate 16d and the mating wrap 2b
Always in contact, the fluid movement space vl + v, IV - mutual leakage n is reduced, and a fluid machine with less leakage is obtained. FIG. 7 is a detailed view showing the communication passage. 1 wound gap 22.23 between the spiral plate 16 and the lug 1b, and a side gap 24.2 between the spiral plate 20 and the wrap 2b.
5 is provided, and these side clearances 22, 23, 24
．． 25Fi, the winding field of the spiral plate is uniformly distributed from 16p to 16Q. These are passages that communicate the space 17.21 and the fluid movement space Vj+''2+V-.

With this configuration, the pressure difference close to the fluid pressure in the fluid movement space becomes small. Therefore, the surface pressure α between the back surface of the spiral plate and the tip of the mating wrap is uniformly distributed from the beginning to the end of the winding of the spiral plate, and a scroll fluid with low leakage and low mechanical loss can be obtained. It has the effect of

Another embodiment of the invention is shown in FIG. A through hole 18.26 is provided near the center of the spiral plate as a passageway connecting the space 17.21 on the back surface of the spiral plate and the fluid movement space. The position of the through hole is such that it can communicate with the closed space Va communicating with the boat (in the case of a compressor, a discharge port) 3 through which high-pressure gas enters and exits. With this configuration, high pressure gas can be easily guided to the space 17.21 on the back surface of the spiral plate. These through holes 18.26 and side gaps 22.25 can also be used together.

By configuring it like this, the space 17 on the back side of the spiral plate
, 21 becomes high at the beginning of winding, becomes low toward the end of winding, and the pressure difference between the front and back of the seal plate becomes smaller. Furthermore, by changing the hole diameter of the through hole, the flow rate of high pressure gas leaking into the space 17.21 can be adjusted.
．． This has the advantage that the pressure level within 21 can be adjusted.

Another embodiment of the invention is shown in FIG. A closed space Vz during the compression process (in the case of a compressor) is used as a passage connecting the space 17.21 on the back surface of the spiral plate and the fluid movement space.
It is a good idea to provide a through hole 27 in the spiral plate at the position where 414 is connected. Constructed like this, from 1K,
Gas having a pressure intermediate between the discharge gas pressure and the suction gas pressure can be guided to the space 17.21 on the back surface of the spiral plate.
21 is adjusted so that it is almost close to the pressure in the closed space V2. For this reason, the spiral plate 16rt and the mating wrap 2b
This has the effect of reducing mechanical loss without being strongly pressed locally.

Another embodiment of the invention is shown in FIG.

An obstacle 28 is placed in the space 1-7 on the back side of the spiral board 16, and the same length as the width is hunted. In this example, the obstacles 28ri
, is housed in a cage 29 provided on the spiral plate 16,
The obstacle 28 and the spiral plate may be made integrally, or the end plate 1
It may be integrated with a. With this configuration, it is possible to prevent the fluid from leaking from the space 17a on the back side of the spiral plate to the space 17b, so it is possible to prevent the pressure in the space 17a from decreasing even in the vertical direction, and the spiral plate 16 gold opponent lap 2b
This has the effect of providing a scroll fluid machine with less fluid loss. Furthermore, the position of the obstacle is preferably the opening to the lower royal chamber, ie, the position of the winding @ the end lb' of the stationary scroll, as shown in FIG. Particularly in the case of compression, leakage into the low pressure chamber (suction volume) reduces the discharge flow rate of the compressor, so it is necessary to seal the gas leaking into the suction volume through the space 17K'' on the back surface of the spiral plate. Therefore, the obstruction 28 at the opening to the first inlet chamber (winding end 1b') prevents the gas from passing through the space 17 on the back surface of the spiral plate, resulting in high efficiency with less fluid loss. This has the effect of producing a scroll fluid machine.

Another embodiment of the invention is shown in FIG. The back surface of the spiral plate 16, that is, the surface facing the end plate 1a, is provided with irregularities. This configuration has the effect of sealing off fluid leaking into the space 17t-vortex i curve on the back surface of the spiral plate by a labyrinth effect.

A second embodiment of this invention is shown in Fig. si4.A coating 30 is applied to the bottom surface of the end plate ia between the wraps 1b.The coating is soft and deforms elastically or plastically when subjected to compressive force. The coating may also be applied to the back surface of the spiral plate 16 (the surface converging with the space 17).

With this configuration, the wrap 2b is connected to the spiral plate 1.
6, the spiral plate 16 can escape in the axial direction due to the deformation of the coating.
This has the effect of not increasing the contact pressure between b and the spiral plate 16.
In addition, the wrap 2b is pressed against the spiral plate 16, and the spiral &16 is further pressed against the coil plate/g, deforming the coating, so that the volume of the space 17 decreases, and the volume of the fluid passing through the space 17 is reduced. This has the effect of reducing JIt't.

Another embodiment of the invention is shown in FIG. The spiral plates 16a and Isb are inserted at the bottom between the wraps 1b, and the spiral plates 20a and 20b are inserted at the bottom between the wraps 2b. Wrap multiple spiral plates in this way 4"Km/'tf6e, !=
K"jP・010" Sandwiched space 17a1 Spiral plate 17
Fluid leaks into the space 17b formed between the wrap 2b and the bottom surface between the wraps, and even if strong pressure is applied from the wrap 2b, it becomes a cushion and deforms, causing the wrap 2b tip and the spiral plate 1 to deform. This has the effect of preventing the contact surface pressure with 6a from increasing excessively. Furthermore, by dividing the space 17 between the spiral plate 16a and the bottom surface between the wraps into 17a and 17b,
It becomes easier to seal the gas with lubricating oil, etc., and has the effect of reducing the amount of gas required to control the spiral plate.

According to the present invention, the spiral plate inserted at the bottom between the laps can always be brought into contact with the tip of the mating wrap with an appropriate force, and even if the area of the bottom of the lap varies due to the inexpensive processing method, the efficiency is always high. There are young fruits from which a scroll fluid machine is obtained.

According to another aspect of the present invention, it is possible to prevent fluid from leaking through the space between the interlap bottom surface and the spiral plate, and therefore it is possible to obtain a scroll fluid machine with less fluid loss.

According to the third aspect of the present invention, it is possible to prevent fluid from leaking through the space sandwiched between the bottom surface between the laps and the spiral plate; This has the effect of providing a scroll fluid machine with low fluid loss and low mechanical loss.

According to the fourth invention, the contact pressure between the spiral plate and the mating lap can be kept constant at all times, and a scroll fluid machine with small flow rate loss and mechanical loss can be obtained. Wow.

[Brief explanation of drawings]

Figure 1 is a top-down view of a conventional scroll fluid machine, Figure 2 is a sectional view taken along line It-II in Figure 1, Figure 3 is a detailed view of the anti-rotation mechanism, and Figure 4 is a cross-sectional view of the conventional scroll fluid machine. A sectional view of an embodiment of the present invention, FIG. 5 is a plan view of the spiral plate, and FIG. 6 is a sectional view thereof.
Fig. 7 is an enlarged partial view of rt, Fig. 8 is a partially enlarged view of another embodiment, Fig. 9 is a plan view of the third embodiment, Fig. 10 is a sectional view thereof, Fig. 11 #i No. 4 A partially enlarged view of an example of
12th I8! ! , l is a top view of the embodiment, No. 13
The figures are a partially enlarged view of an embodiment of another invention, FIG. 14 is a sectional view of an embodiment of the third invention, and FIG. 15 is a partially enlarged view of an embodiment of the fourth invention. DESCRIPTION OF SYMBOLS 1... Stationary scroll member, 2... Orbiting scroll member, 1a, 2a, one end plate, lb, 2b-...
Wrap, 3° 4... Boat, 5... Frame, 6.
...Kuhunk m, 7. 8...Bearing, 9...Balance weight, 12...
-1 blocking member, 13...-? -114... Mechanical 7-rule 16... Spiral plate, 17... Space, 18.1
9... Through hole, 20... Spiral plate, 21... Space,
22, 23, 24゜25...Side clearance, 2 b T
27... Through hole, 28... Obstacle, 29... Groove, 3o... Coating. 10 - 12Il 3, 4, 4; Kanaka 7, 110, 12, 13, 411! J Sai 15 (2) Procedural amendment (method) 1. Indication of the case Patent Application No. 81403 of 1981 2 Title of the invention Scroll fluid machine 1 Person making the amendment C510 seal, ceremony 1111 Production location -4I
I+ Katsushige 4, Deputy Mr. Hitoshi and - (7237) Bu `` Ri 1 Thin
Hl Ri da, ゛1・first, -': ,',4
',:' 5. Amendment Order Lower August 81, 1981
'1,246, Subject of amendment Figure 9 of the drawings and JO
Figure 17, Contents of the amendment The corrections are made as shown in the attachment.

Claims (1)

[Claims] 1. Two scroll members formed by an end plate and a wrap portion that stands upright thereon and is formed of an involute or a curve close to an involute, with the wrap portion facing inward. In a scroll member that engages with each other in a state in which one scroll member rotates in such a way that it does not appear to rotate relative to the other scroll member, a double-wound plate is attached at the bottom between the laps, and an iron plate is attached. A passage that slides with the tip of the other lap on the surface of the iron plate and connects the space C formed between the iron plate and the bottom surface between the laps and the fluid movement space formed by the two meshed laps. A scroll fluid machine characterized by having: 2. The scroll fluid machine according to claim 1, wherein a uniform clearance is provided between the side surface of the spiral plate and the wrap side l from the beginning of the wrap to the end 9 of the wrap to form the communication passage. 3. Provide a hole penetrating the spiral plate from the back side to the front side,
A scroll fluid machine according to claim 1, wherein the communication passage is the communication passage. 4. The scroll fluid machine according to claim 3, wherein the through hole is provided at a position facing the highest pressure space of the fluid movement space formed by the two laps. 5. The through hole is provided in a position facing a space having a pressure intermediate between the discharge pressure and the suction pressure among the fluid movement spaces formed by the two meshing wraps, as set forth in claim 3. Scroll fluid machine. 6. In the space between the back surface of the spiral plate and the bottom surface of the wrap,
A scroll fluid machine according to claim 1, wherein a barrier is provided substantially perpendicular to the spiral plate. 7. Two scroll members formed by an end plate and a lap part made of an involute or a curve close to an involute standing on the end plate are engaged with each other with the lap parts facing inward. In a scroll member in which one scroll member rotates so as not to apparently rotate relative to the other scroll member VC, a spiral plate having unevenness on one side is inserted so that the unevenness faces the bottom between the laps, and the spiral plate is The smooth surface of the plate is made to slide against the tip of the other wrap, and the space formed between the back surface of the spiral plate and the bottom surface between the wraps, and the fluid movement space formed by the two meshed wraps. A scroll fluid machine characterized by having a passage communicating with. 8. Two scroll members formed by a plate and a lap part that stands upright and has an involute or a curve close to an involute are engaged with each other with the lap parts facing inward. , - In the moor where the scroll member of the sword rotates so that it does not appear to rotate relative to the other scroll member, a spiral plate is inserted at the bottom between the laps, and the front end of the spiral plate slides against the tip of the other lap. A passage is provided that communicates the space formed between the back surface of the spiral plate and the bottom surface between the laps and the fluid movement space formed by the two meshed wraps, and the back surface of the spiral plate or A scroll fluid machine characterized by a coating applied to the bottom surface between the laps. 9. Two scroll members formed by an end plate and a lap part formed of an ori, an involute, or a curve close to an involute standing upright thereon are engaged with each other with the lap parts facing inward. In the case where one scroll member rotates in such a manner that it does not appear to rotate relative to the other scroll member, a plurality of spiral plates are inserted at the bottom of the same lap, and the surface of the topmost spiral plate is used to rotate the other scroll member. It is characterized by providing a passage that slides on the tip and communicates the space formed between one surface of the spiral plate and the bottom surface between the laps and the fluid movement space formed by the two meshed laps. Scroll fluid machine.