JPS59194096A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To regulate the operating characteristic such that the top clearance volume is brought substantially to zero while at least one of the position, size, shape, number of volute is varied. CONSTITUTION:A volute member of same shape (not shown) having an end board 700 for a volute member 501 at the fixed side, a delivery board 701 provided properly on the end board in accordance to the application and a delivery board 702 provided properly in accordance to other application is provided revolvably without spinning while contacting with the fixed side volute member 501. The minimum level of the central small chamber formed between the contact points of both volute members is brought to zero while at least one of the position, size, shape and the number of volutes is varied to regulate the operating characteristic.

Description

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

For example, in a known scroll compressor, one of two spiral bodies having the same shape, as shown in FIG.
is fixed to a seal end plate having a discharge port 4 approximately in the middle, and both are rotated 180° relative to each other as shown in FIG.
And the spiral bodies of both are 51.52 and 51'
, 52', the distance 2ρ(
- Pinochi of the whirlpool 2 x thickness of the whirlpool) are stacked on top of each other, one whirlpool rest 2 is stationary, and the other whirlpool body 1 is connected to one whirlpool by a crank mechanism having a crank radius ρ. The groove is formed so that the body 2 rotates around the center 00 of the body 2 at a radius of ρ-〇〇' without rotating on its own axis.

Then, between the two spiral bodies 1 and 2, there are points 51 and 52 where both the spiral bodies abut, and points 51' and 52'.
A sealed small chamber 3, 3 is formed in between, and a sealed small chamber 3, 3 is formed.
The volume of the spiral body 1 gradually changes as the spiral body 1 revolves.

That is, from the state of (1) in the same figure, first turn the spiral body 1 into 9
When it revolves at 0', it becomes (2) in the same figure, when it revolves at 180 degrees, it becomes (3) in the same figure, and when it revolves at 270 degrees, it becomes (4) in the same figure.
), and during this period, the volume of chamber 3 gradually decreases, and in figure (4), the two chambers 3.3 communicate with each other to form chamber 53, and when they revolve further 90 degrees from the state of figure (4), the same figure(
1), and the volume of the small chamber 53 is determined from the figure (2) to the figure (3).
), and the volume becomes the smallest between (3) and M (4) in the same figure, and during this time, the outer space that began to open in (2) in the same figure becomes (3) in the same figure, Moving from (4) to (1) in the figure, new gas is taken in to form a closed chamber, and this process is repeated thereafter, and the gas taken in from the spiral outer body 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.
．． Rear end plate 12. Consisting of a cylinder plate 13, an intake port 14 and a discharge port 1 on the rear end plate 12.
5 is protruded, the spiral body 252 and the disc 2
A stationary scroll member 25 consisting of 51 is fixed, and a main shaft 17 having a crank pin 23 is pivotally connected to the front end plate 11. , radial needle bearing 26. Boss 243 of the revolving scroll member 24. Square tube member 271. A revolving scroll member 24 consisting of a spiral body 242 and a disk 241 is attached via a non-rotating and revolving mechanism consisting of a sliding body 291, a J-thong material 2922, a detent 293, and the like.

The shape of the spiral bodies 1 and 2 of such a scroll type compressor is determined by, for example, the outside of the spiral body, as described in detail in Japanese Patent Application No. 1976-1972 proposed by the present inventors. And most of the inner curve can be composed of involute functions, but as described in the operating principle, the small chamber 53 gradually decreases its volume, and as a result, high-pressure fluid is discharged from the discharge port. When the spiral body has a thickness, the volume of the small chamber does not become zero, and there is a phenomenon in which a so-called top clearance volume remains.

That is, as shown in the enlarged view of the fourth fixed part, (1)
corresponds to Fig. 1 (3), and two spiral bodies 1,202
The small chamber 53 formed between the two contact points 52 and 52' is
When it revolves further, it becomes as shown in the same figure (2), and small chamber 5 is formed at Komata.
The volume of the spiral body 3 becomes the minimum, and when the spiral body 1 is further revolved, the two spiral bodies 1 and 2 are separated, and the contact point is 52°52
' has disappeared, and the small chamber 53 formed between the two spiral bodies 1 and 2 communicates with the small chambers 3 and 3 formed on the outside of each spiral body.

Therefore, the high-pressure fluid in the minimum volume of the small chamber shown in FIG. The work done by the compressor on the fluid is lost.

Further, since the tips of the central portions of the spiral bodies 1 and 2 each have sharp edges, these portions may be damaged during operation, and furthermore, machining of these tips requires a lot of man-hours.

In order to eliminate such drawbacks, the present inventors previously proposed the following structure in Japanese Patent Application No. 57-206088.

According to this structure, first, in the fair view of FIG.
501 is related to Japanese Patent Application No. 57-206088 (fixed side)
The spiral bodies 601 and 602 are the outer and inner curves of the spiral body 501, respectively, and the outer curve 661 is the base circle radius, the involute curve of the starting point A, and the inner curve 6.
Between EF of 02 is an outer curve 601 and a rectangular curve, between DE is an arc with a radius of approximately The starting point, point B, is the outer curve 60
1 and the connecting curve 603, and the double opening lines have the same radius of curvature at this point. Point C is a point sufficiently outside the outer curve 601, and the point is the boundary point between the inner curve 602 and the connecting curve 603. At this point, the two arcs with radii R and r touch. Point E is the boundary point between the inner curve 6020 arc (between DE) and the involute curve EF. At this point, both sides have the same radius of curvature. F is a point well outside the inner curve 602.

The same applies to the other revolution side spiral body 502.

Here, the radii R and r are expressed by the following formula.

R-ρ+bβ+b r = bβ 10d, ρ: Radius of revolution b = Radius of base circle b'-(,--+bβ)' d = ,,-,,,-,---,-,-,- --2
(-+bβ) β=parameter.

Next, in FIG. 6, 502 is a spiral body on the revolution side;
52 and 552' are contact points of both spiral bodies, 5
53 is a small chamber formed at contact points 552° and 552';
03.503 are the outer chambers, and (1) in the same figure is
Figure 4 (1), Figure 4 (2) correspond to Figure 4 (2), Figure 4 (3) corresponds to Figure 4 (3), and Figure 4 (
4) and (5) respectively show the case where the spiral body 502 is further revolved from the figure (3).

Both spiral bodies 501 and 502 are relative to each other in Figure 6 (1)
, (2), (3), (4), and (5) in the order of revolution, the volume of the small chamber 553 formed by the contact points 552 and 552' decreases, and the contact point at (5) in the same figure decreases. 552 and 552' become the same point, which makes the small chamber 55
The volume of 3 becomes zero.

For this reason, the so-called top clearance volume that existed conventionally becomes zero, and all of the fluid compressed from this volume is discharged to the outside from the discharge port (not shown), and all of the work that the compressor applies to the fluid is transferred to the fluid. The losses that previously existed will disappear.

Although the size of the discharge port has been ignored for the sake of convenience in the above embodiment, it is actually necessary to form the discharge port at an appropriate position where the small chamber 553 is formed.
Although this results in some top clearance volume, this amount is much smaller than in the prior art and can be considered essentially zero.

According to such a structure, the tip shapes of the central portions of the spiral bodies 501 and 502 are as shown in FIG.
By making the connection curve 603 a circular arc, there is no sharp edge, and this part will not be damaged during operation of the machine.
By making each of 03 into a circular arc, it becomes easy to process the spiral body.

The present invention further develops such a structure so that even if the application or displacement changes, the base circle radius and revolution radius ρld
The object of the present invention is to provide a scroll-type fluid machine stock that reduces costs by machining the spiral body with the same machine tool while keeping the characteristic values of the spiral body constant, such as lβ.

To this end, the present invention has two spiral bodies of the same shape, one of which is fixed, and the other that is in contact with the one and revolves around its axis without rotating. The position of the discharge port in a device in which the minimum value of the small chamber is substantially zero.

It is characterized in that the operating characteristics are adjusted by changing at least one of the size, shape, and number of spirals.

An embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a front view showing a fixed example of the spiral body, and FIG. 8 is a diagram showing the relationship between the turning angle and the volume of the spiral body according to the present invention.

First, in Fig. 7, 501 is the aforementioned patent application filed in
The spiral body proposed in No. 6088 shows the fixed side spiral body, 700 is its end plate, 701 is a discharge port appropriately provided in the end plate 700 according to the purpose of use, 702
is a discharge port that can be appropriately provided for other purposes.

In such a scroll-type rotating machine, the two spiral bodies do not engage and separate in the middle, and the volume of the small chamber 553 eventually becomes zero, so the design volume ratio Vi and the design pressure ratio φ1 are determined by the discharge port. determined by the position of

FIG. 8 shows the relationship between the rotation angle of the revolution-side scroll and the volume of the small chamber in such a scroll-type rotating machine, and the volume of the discharge port is ignored for the sake of explanation.

Here, the volume of point B = VB Point A 〃 2VA Point Al〃 = ■8' Point A is the volume when the small chamber 503 communicates with the discharge port when the discharge port 701 shown in Fig. 7 is provided. volume,
Similarly, point A' is the volume when the small chamber 503 communicates with the discharge port when the discharge port +-702 is provided.

That is, in the first case, the design volume ratio Vil and the design pressure ratio φ11 when the discharge port 701 is provided are as follows.

A φ1l−(Vil)k As the second case, the design volume ratio Vi2 and the design pressure ratio φ12 when the discharge port 702 is provided are as follows.

■A / φi 2 - (V i 2 ) k Tag, k is polytropic index To change the displacement of the machine, in addition to the height of the spiral body, change the number of turns N of the spiral, and if necessary change the discharge port. All you have to do is change the position or size of the dashed line 70 in Figure 7.
3 is a case where the number of windings N of the conventional spiral body 501 is set to 1, and the volume VB at point B' in FIG. 8 is the displacement amount at that time.

The shape of the whirling holiday is based on the aforementioned patent application 1987- It is not limited to 206088.

The present invention is not limited only to compressors, but can also be applied to pumps, expanders, etc., and is not limited to any applications.

According to such an invention, the spiral body can be machined with the same machine tool even if the use and operating conditions are different, so it is possible to reduce the cost of the scroll-type fluid machine.

In short, according to the present invention, it has two spiral bodies of the same shape, one is fixed, the other rotates on its axis while contacting the above one, and the spiral body is formed between the contact points of both spiral bodies. By adjusting the operating characteristics by changing at least one of the position, size, shape, and number of spirals of the discharge port, The present invention is extremely useful industrially because it provides a scroll-type fluid machine at low cost.

[Brief explanation of the drawing]

Figure 1 is a diagram of the operating principle of a known scroll compressor, Figure 2
The figure is a longitudinal cross-sectional view showing a known scroll type compressor, Figure 3 is a cross-sectional view taken along the line ilI-III in Figure 2, and Figure 4 shows changes in the central small chamber of the spiral body in Figure 2. Figure 5 is a partial front view showing the spiral body proposed in Japanese Patent Application No. 57-206088, Figure 6 is a partial front view showing changes in the central chamber of the spiral body in Figure 5, Figure 7 The figure is a front view showing a fixed-side spiral body according to an embodiment of the present invention.
FIG. 8 is a diagram showing the relationship between the turning angle and the volume of the spiral body according to the present invention. 501... fixed side spiral body, 503,553... small chamber,
700... End plate, 701, 702 ・Discharge port,
703- Uzumaki body. Sub-Agent Patent Attorney Masafumi Tsukamoto

Claims (1)

[Claims] It has two spiral bodies of the same shape, one is fixed and the other is allowed to revolve without rotating while touching the above one, and the minimum value of the small chamber in the center formed between the contact points of both spiral bodies is effectively In the case where the value is set to zero,
A scroll-type fluid machine characterized in that the operating characteristics are adjusted by changing at least one of the position, loudness, shape, and number of spirals of the discharge hoard.