JPS5954701A - Rotary fluid machine - Google Patents

Abstract

PURPOSE:In a rotary fluid machine having two volute members, to maintain the characteristic value constant regardless of displacing volume, by employing same shape volute member having different number of volute while removing the central portion of volute. CONSTITUTION:In a rotary fluid machine for delivering the fluid by means of a static scroll member where engagable volute members are provided on a pair of disc faces arranged oppositely with an interval and a revolving scroll member, and conventional volute 500 shown by the solid line (The outside and inside curves 501, 502 are formed with involute lines) are formed as shown by dashed line. In other word, the number of volutes are made different while employing same shape of volutes then the central portion of volute is cut and the inner end C is arched. With such a structure, a fluid machine having different displacing volumes is obtained with low cost through a simple improvement.

Description

[Detailed description of the invention] The present invention relates to a rotary fluid machine.

This known fjF compressor, as shown in the operating principle diagram in Figure 1, has two spiral bodies of the same shape, one of which is fixed to a sealed end plate having a discharge port 4 in the middle, and the other is The spiral body 1 is fixed to the other seal end, and both are rotated 180 degrees relative to each other as shown in FIG.
The distance is 1 + 2ρ so that they touch each other at 4 points of 52'.
By relatively shifting by (-pitch of whirlpool - 2 x thickness of whirlpool), L7. Place one spiral body 2 on top of the other and hold one of the spiral bodies 2 still.

The other spiral body 1 is configured to revolve around the center 0 of one spiral body 2 with a radius ρ-oo' without rotating around the center 0 using a crank mechanism having a crank radius ρ. , then two spiral bodies 1.2
In between, there are points 51, 52 and 5 where both spiral bodies come into contact.
1') A sealed small chamber 3°3 is formed between the coils 52', and the volumes of the sealed small chambers 3, 3 gradually change as the spiral body 1 revolves.

That is, if the spiral body 1 is first revolved by 90 degrees from the state shown in figure (1), it will become as shown in figure (2).

When it revolves 180 degrees, it reaches (3) in the same figure, and when it revolves 270', it reaches (4) in the same figure.During this period, the volume of chamber 3 gradually decreases, and in (4), the two chambers 3. 3 communicates and becomes a small chamber 5:3, and when it revolves further 90 degrees from the state of (4) in the same figure, it becomes (1+) in the same figure, and the volume of the small chamber 53 becomes (
The volume is reduced from 2) to (3) in the same figure, and (3) in the same figure
The volume becomes the minimum between the figure (, I), and during this time, the outer space that begins to open in the figure (2) (3) 1 From the figure (4): figure (1), Move to new ``'na/irregular j/,''''C voice closed'J,) 1! form, become,
From now on, repeat this □ and get thin > j.

The gas that has been taken out of the space is compressed and discharged from the discharge port 4.

The above is the operating principle of a scroll type compressor. Specifically, as shown in the vertical cross-sectional view of FIG.
11. Rear end play 1-12. When the suction port 14 and the discharge port 15 are provided protruding from the rear end plate 12 from the cylinder plate 13, the spiral body 25
2 and a disk 251. The scroll member 25 is fixed, and the main shaft 17 having a crank pin 23 is pivotally connected to the front end plate 11.
As shown in FIG. 3 (a cross-sectional view of the river-1!1 in FIG. 2), the radial needle bearing 26. Revolutionary scroll member 24
Boss 243. Square tube member 271. Sliding body 291. Ring member 2921 Stops rotation, 29: Through a revolution mechanism consisting of 3, etc., the spiral body 2/12 and the disc 2
A crawling member 24 is attached.

□ It is the spiral shape that reflects the characteristics of the spiral body of a scroll compressor.

This shape was previously proposed by the present inventors in Japanese Patent Application No. 56-141767.
No. 2, as described in detail in Japanese Patent Application No. 197673/1973.
In addition, it is determined by the base circle radius of the involute curve of the spiral = b and the revolution radius of the revolving spiral body - ρ.

It is known that there is a relationship between ρ and the groove Il of the concave body and the thickness TR as follows: groove ri]TG−πb×ρ·□Thickness TR=πb−ρ.

And 5. What determines the capacity of a rotary fluid machine (in the case of compression countries, it is also called the displacement amount or suction amount)?
- and ρ, the number of windings N, and the height and depth of the spiral), and when changing the displacement of the machine, as shown in Figure 4, the number N of windings is the solid line part N =
Broken line part from B? ! If J=B' is increased, the amount of displacement can be increased, and the relationship between the turning angle (revolution angle) and the volume is as shown in FIG.・In other words, in the same figure.

The point ^ is when the volume of the small chamber 53 shown in the operating principle of FIG. 1 is at its minimum, that is, between (3) and (4) in FIG.

Point D in Figure 4 of Japanese Patent Application No. 197573/1982 is shown, indicating a point that begins to separate near the center of the spiral body. 56-1
This corresponds to point B in Figure 3 of No. 97672.

Point B indicates the point at which a closed chamber begins to form when the number of spirals is N = B (see the solid line in Figure 4), that is, the point at which the two spiral bodies begin to touch on the outside, and point B' is the point at which the spiral begins to form. It shows the point at which a closed chamber starts to be formed when the number of firewood is N=B' (see the broken line in Fig. 4). .

When the number of windings of the whirlpool N=B, the volume ratio V i B is Also, the pressure ratio φiB is becomes.

and k is the polytropic index.

Similarly, to increase the displacement, the number of fires N=B-)
Volume RI ratio V i B ' for B' and L7'C.

The pressure ratio φiB’ is respectively becomes.

Accordingly, VB<VB', l: ViB', and therefore φ B × φiB', and the volume ratio and pressure ratio of Jinno et al. are called the volume ratio and the design pressure ratio.

By the way, the conditions under which a machine is actually operated are such that the operating force ratio is determined depending on the machine's use, so usually the machine is set so that the operating pressure ratio and the traction pressure ratio match. If these differ, the efficiency of the machine will drop dramatically, so if we change the number N to make the displacement of the machine small or small, what will be the result of the dissection volume ratio and design? Therefore, conventionally, b and ρ, which determine the characteristics of the whirlpool, have been determined for each application or displacement. Since a different spiral shape is required for each displacement meter, the manufacturing of the spiral body becomes complicated, and the measurement of the shape of the spiral becomes complicated.
This is a good idea because it requires a measuring machine and a set-up process for each shape of the whirlpool.

The present invention was proposed in view of these circumstances.
Use or displacement (1'L is different -C- also changes the shape of the swirl -(r (, 't'H41: value'(
In the scroll type fluid machine, the purpose is to offer a rotary fluid machine in which l) and ρ) are constant. 1 and the shape is the same.

The feature is that when the number of vortices differs from each other, the central part of the vortex is cut out to change the installed volume ratio.

An embodiment of the present invention, which is suitable for I-I stations with the same operating force ratio and 1ttj'5x different displacement, will be explained with reference to the drawings. 7th
The figure is based on the spiral body of Figure 6! ji+: Line showing the relationship between the angle and the volume (null 0, 1, in Figure 6, the solid line is '1.!+' I Gusho 56-), 976
No. 72, 1982-1. ! In the conventional one shown in No. 17673, the spiral shape of the spiral body 500 (outside curve 501. inside (luul + curve 502) is formed by an involute curve, respectively) (excluding the vicinity of the center of the inside curve 502). ), its starting point is on the X axis, and the number of fires N is N
= 11 t represents the number of whirlpools, and the number N of whirlpools is shown from the X axis.

Next, the broken line is according to the present invention, and the number of fires N=B'
(B'> B), and the sowing starts from C at the 1'T point outside of the conventional one. However, the method of counting the spiral number N=B' is the same as in the conventional method, expressed as Xllll1ll, and is made by cutting out the central part of the spiral. Note that portion C in the figure is a circular arc with radius R that smoothly connects the outer and inner curves.

In such a spiral body, the relationship between the volume and the turning angle is shown in Figure 7, in which point A9, point B1, point B
'd, is shown in Figure 5'', and I is the conventional one, and point C is the central part of the spiral size in Figure 6 and Q of the spiral shape of the present invention. If we take it as part C, that is, the middle part of the conventional one divided by 9' mixture, 2
The two spiral bodies start Al111 in the medium heat section, ie, the point in FIG. 1 where the volume of chamber 5;

Here, when the volumes of points A, B, B' and C are respectively iVA, VB, VB', J:hiVC,
VA, VB, VB', VC, and hence the points A, B, B', C, -1, so that φIB2φ113', the number N=2B.

Determine B'.

1. i,;l:,;,r已71゛'1 +・(Pushing two tables aside, like two 1'!1:: II2, different and both like VB and VB' The pressure ratios φiB and φiB' are the same as described above.

Therefore, different displacements and machines for the same application...
,,,Fl "D"j"l: @, (x, > Oi4
In the case of an m-body machine, b and ρ are obtained.

Therefore, it is a scroll type fluid machine.

It is possible to obtain machines with different displacements while keeping the characteristic value of ρ the same (constant), that is, with a constant spiral shape. Prices fall.

In the above embodiment, a scroll type compressor was described where the spiral shape used an involute function.
For example, using circular arcs in addition to involutes,
The present invention can be applied to a scroll type fluid machine such as -93992, and also to a rotary type fluid machine other than a scroll type fluid machine.

The present invention is not limited to compressors, but can also be applied to rotary fluid machines such as expanders or pumps.

The portion C in FIG. 6 is not limited to a circular arc having a radius R, but may be any curve connecting the outer curve and the inner curve.

In the above example, one of the spirals with the same set pressure ratio was involue 1, the winding started from the base circle (X axis), and the other spiral had the middle heating part cut off. Although the central part of the whirlpool is removed in both cases, the number of windings of the whirlpool may be changed and the dissection pressure (design volume ratio) may be the same (or may be changed to a desired value).

In short, according to the present invention, the spiral shapes of the spiral bodies of a rotary fluid machine having two spiral bodies are the same,
When the number of spirals differs from each other, the design volume ratio is changed by cutting out the medium heat part of the five spirals, resulting in a high-performance rotary fluid machine that maintains constant characteristic values even if the application or displacement differs. of? However, the present invention is extremely useful industrially.

[Brief explanation of drawings]

Figures 1 (1) to (4) are diagrams of the operating principle of a known scroll type compressor, Figure 2 is a vertical sectional view of a known scroll type compressor, and Figure 3 is a diagram showing III- and Ill of Figure 2. FIG. 4 is a front view of the spiral body shown in FIG. 3, FIG. 5 is a line diagram showing the relationship between the turning angle and the volume of the spiral body shown in FIG. FIG. 7 is a front view of the spiral body showing one embodiment, and is a diagram showing the relationship between the turning angle and the volume of the spiral body of FIG. 6. 500... spiral body, 501... outer curve, 502...
・Inner curve, sub-agent Masafumi Tsukamoto, patent attorney

Claims (1)

[Claims] If the spiral shapes of the spiral bodies of a rotary fluid machine having two spiral bodies are the same, but the number of spirals is different from each other, the design a1 volume ratio can be changed by cutting out the central part of the spiral. A rotary fluid machine characterized by: