JPH03290082A - Joint method between blade and rotary center body of noncontact type rotary machine - Google Patents

Abstract

PURPOSE:To reduce the mutual gaps between the fixed center bodies, rotary center bodies, and blades and increase capacity by installing a close attached body integrally with a rotor blade, drastically reducing the maximum deflection by increasing the rigidity of a fixed center body, and improving the joint method between the rotor blade and the rotary center body. CONSTITUTION:As for rotor blades 1 and 1' which revolve integrally with rotary center bodies 7 and 7', in close contact with the outer peripheral surfaces of the fixed center bodies 5 and 5' fixed outside the rotary center bodies 7 and 7' and which is on the sides of the bodies 5 and 5' the close attached bodies 14 and 14' at the intermediate positions of the rotor blades 1 and 1' are constituted so as to be integral with the rotor blades 1 and 1', and the rotary center bodies 7 and 7' are inserted and attached with the inner peripheral surfaces of the close attached bodies 14 and 14', and the close attached bodies 14 and 14', blades 1 and 1', and the rotary center bodies 17 and 17' are integrally joined by bolts 15 and 15'. Accordingly, each length of the fixed center bodies 5 and 5' can be made the half of the conventional, and the rigidity of the fixed center bodies 5 and 5' can be markedly increased, and the leak loss can be reduced by inserting the fixed center bodies 5 and 5' from both the edge part sides of the blade.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a rotor in which at least one of a pair of rotors rotates while closely contacting the outer peripheral surface of a fixed center body fixed outside the rotation center body. The present invention relates to a non-contact rotating machine configured to have blades that rotate integrally with a center body, and more particularly to a method of coupling the blades of the rotor and the rotation center body.

(Prior Art) In order to properly understand the present invention, first, the non-contact rotating machine according to the present invention will be explained.

In FIG. 1 (see also FIG. 2, which shows a side view), each rotor blade 1, 1' is connected to a center of rotation 7, 7.
The rotating center bodies 7, 7' are configured to rotate integrally with the rotating center bodies 7, 7' while being in close contact with the outer peripheral surfaces of the fixed center bodies 5, 5', which are respectively fixed on the outside of the rotary center bodies 7, 7'.

Each blade 1, 1' has blade side plates 4, 4' at both ends, respectively.
is fixed, and in the second time, the blade side plates 4 and 4' on the right side firmly fix and connect the blade 1 and the rotation center body 7, and the blade 1' and the rotation center body 7', respectively. The left blade side plates 4, 4' are fixed to the ends of the blades 1, 1', respectively,
It rotates in close contact with the outer peripheral surface of the fixed center bodies 5, 5'.

A counterweight is built into the blade side plates 4, 4'.

2 (2') is the outer circumferential surface of the blade that is in close contact with the inner circumferential surface of the casing and the fixed center body 5' (5) (generally, the outer circumferential surfaces of the blades 2, 2' are facing each other to the fixed center body 5', 5). It is preferable to form missing circular parts 11' and 11 that are in close contact with each other), (3)
(3') is the outer peripheral surface of the blade.

Lines C2 and C4 are tooth profiles created by the tip of line C3 and the tip of line C1, respectively, and thus each rotor is synchronously rotated in opposite directions by synchronous gears without contacting each other. It has become.

Now, if we pay attention to the working chamber 9 (9'), we can see that the working chamber 9 (9')
) is compressed as the volume decreases as the rotor rotates, and when the pressure becomes almost equal to the pressure inside the rotating center body 7 (7'), the opening/closing port 8 (8') connects to the communication port 6 (6'). The liquid is communicated with the liquid so that it is discharged into the rotation center body 7 (7').

Then, the rotor rotates and the tip of the line C3 becomes the fixed center body 5.
(More specifically, the wall surface of the circular cutout 11'), the tip of the line C2 is configured to be at a position near the moment when it reaches the fixed center body 5' (specifically, the wall surface of the circular cutout 11') at the latest. Since the working chamber 9' and the passage 1 are in the compression process,
It does not communicate with 0 and can function as a pump.

In addition, if the pressure ratio is small (1.3 to 2.5), line C
1. Modify C2, C3, and C4 to create a gap between the tip of line C'3 and line C'2 in a close state, and a gap between the tip of line C'1 and line C'1, as shown in Figure 3. It is also possible to form a large gap between C'4 and C'4 (usually 3 to 4 m).
However, immediately after the tip of line C'3 (C'1) separates from the inner peripheral surface of the casing, opening/closing port 8 (8') and communication port 6
(6') to prevent backflow from inside the rotating center body 7 (7').

After the moment when the tip of the line C'3 separates from the inner circumferential surface of the casing, the fluid remaining in the working chamber 9 is removed from the line C'3.
is released into the working chamber 9' through a large gap between the tip end and the line C'2, expands uniformly, is compressed again within the working chamber 9', and enters the rotation center body 7'. It ends up being discharged.

By the way, if the rotation direction of each rotor is reversed in FIGS. 1 and 3, the opening/closing opening 8 (
8') and the communication port 6 (6') is cut off until the high pressure fluid supplied is expanded until the pressure becomes approximately equal to the pressure inside the passage 10 by expanding the volume of the working chamber 9 (9'). , it can function as an expander.

Next, in the non-contact rotating machine according to the present invention shown in FIG. 4, only one rotor is integrated with the rotation center body 7 while being in close contact with the outer peripheral surface of the fixed center body 5 fixed outside the rotation center body 7. It has a blade 1 that rotates at a angle of
2 is created by the tip of the line l3, and one of the lines l1 and l4 is created by the other line, and the blade outer peripheral surface 2 is in close contact with the line l5 (circular arc). It has become.

12 is a recessed portion into which the blade 1 is fitted.

Similarly to FIG. 1, the working chamber 9 is configured to communicate with the inside of the rotation center body 7 through the communication port 6 and the opening/closing port 8 during the period when the minimum volume state and the intermediate volume state are communicated. If you rotate the rotor on the side to the left, it will function as a pump, and if you rotate it to the right, it will function as an expander.

Figure 5 shows what is already known as a Behren pump, in which the blades 1 and 1' of each rotor are connected to the center of rotation 7 and 7'.
The rotating center body 7, 7' rotates integrally with the outer peripheral surface of the fixed center 5, 5' which is fixed on the outside of the rotary center body 7, 7'.

When it functions as a pump, the fluid sucked from inside the passage 10 is discharged into the passage 13 by the rotation of the rotor, and when it functions as an expander, the rotor rotates in the opposite direction, and the high-pressure fluid that has flowed from inside the passage 13 is discharged into the passage 13. This generates power.

Now, in the non-contact rotating machine according to the present invention as described above, as is clear from FIG. 2, the fixed center body 5 (5') is a cantilever beam fixed at one end as shown in the principle diagram in FIG. (The fixed center bodies 5 and 5' in Figs. 3, 4, and 5 are exactly the same), and l'1 is the length (equal to the blade length) that receives the fluid pressure in the working chamber 9 (9'). ), l2 as blade 1 (1
') to the fixed part of the fixed center body 5 (5'), the maximum deflection δmax when subjected to a load due to fluid pressure in the working chamber is, however, E and I are each fixed. The Young's modulus of the central body, the second moment of area, and ω are the load per unit length.

It can be seen that δmax is a function of l'1 to the fourth power, and that δmax increases extremely rapidly as l'1 increases.

Therefore, in the case of a non-contact rotating machine where l'1 is long to some extent, the blade 1 (1'), the fixed center body 5 (5'), and the rotating center body 7
The risk of mutual contact with (7') increases, and to avoid this, the gap between them must be increased, which has the drawback of increasing leakage loss.

In addition, when increasing the capacity of a non-contact rotating machine by lengthening l'1 (increasing the blade length), it is actually extremely difficult to desire more than a certain level for the reasons mentioned above (for large machines, is not suitable).

(Problems to be Solved by the Invention) An object of the present invention is to provide a method of coupling rotor blades and a rotating center body, which can increase the rigidity of the fixed center body and significantly reduce the maximum deflection. Therefore, the capacity of the non-contact rotating machine can be increased by reducing the gap between the fixed center body, the blades, and the rotating center body, and increasing the length of the blades while maintaining sufficient rigidity of the fixed center body. The point is to show you how things can be done.

(Means for Solving the Problems) In order to solve the drawbacks of the conventional art, the present invention provides a system in which at least one of a pair of rotors that rotates in opposite directions synchronously without contacting each other rotates. A blade of a rotor on the side of the fixed center body of a non-contact rotating machine configured to have a blade that rotates integrally with the rotation center body while being in close contact with the outer circumferential surface of the fixed center body fixed to the outside of the center body. Focusing on this, the close body located at the intermediate position of the blade is constructed so as to be integrated with the blade, and the rotation center body is inserted into the inner circumferential surface of the close body and brought into contact with the close body to cause rotation between the close body and the blade. The close body is firmly and integrally connected to the center body, and the close body has a cylindrical surface that comes into close contact with the outer peripheral surface of the mating rotor, and the fixed center body extends from both end sides of the blade to the close body. In this way, the blades and the center of rotation were constructed so as to be connected to each other.

(Example) Fig. 7 shows an example of the method of coupling the blades of a non-contact rotating machine and the rotation center body according to the present invention (Fig. 8 shows a sectional view taken along the line A-A', and Fig. 8 shows the cross-sectional view taken along the line B-B').・No. 9 showing the cross-sectional view along the line C-C'
(Please also refer to the figure at the same time), if we pay attention to the blade 1 (1') of the rotor on the side of the fixed center body 5 (5') (both rotors have a fixed center body, so we pay attention to the blades of both rotors respectively). - In the case of Figure 4, pay attention only to the upper side), same blade 1
The close body 14 (14') located at the intermediate position (axially intermediate position) of (1') is constructed so as to be integrated with the same blade 1 (1') (see Fig. 8), and the close body 14 The rotation center body 7 (7') is inserted into and brought into contact with the inner peripheral surface of (14'), and the close body 14 (14') and blade 1 (
1') and the rotational center body 7 (7') are firmly and integrally connected (of course, they may also be integrally connected by welding, etc.).

The close body 14 (14') has a cylindrical surface that comes into close contact with the outer circumferential surface of the mating rotor, that is, the outer circumferential surface of the blade 2' (2).

Therefore, the cylindrical surface of the close pair 14 (14') comes into close contact with the outer circumferential surface of the mating rotor (blade outer circumferential surface 2' (2)) in a line-to-line manner, but both sides of the close pair 14 (14') The part is B
As is clear from FIG. 9, which shows the cross-sectional views along the -B' line and the C-C' line, the outer peripheral surface 2' (2) of the blade is conventionally cut into the missing circular portion 11 (
11'), leakage loss is extremely small (good sealing performance).

When manufacturing a rotor, first, the close body 14 (14') and the blades 1 (1') are manufactured as one body, as shown in FIG. 8, by casting, for example, and then the close body A hole formed in 14 (14') is machined, and the center of rotation body 7 (7') is inserted thereinto, brought into contact with the inner circumferential surface, and is firmly connected integrally with bolts, welding, or the like.

Next, the tool 17 having the cutting edge 16 shown in FIG. 10 is inserted into the outer peripheral surface of the rotation center body 7 (7') while rotating with the rotation center body 7 (7') as a reference, and the tool 1 is machined.
7 (cutting edge 16) has an inner diameter and an outer diameter corresponding to the fixed center body 5 (5'), so the cross section of the part machined by the tool 17 is as shown in FIG. 9, and as shown in the figure. The fixed center body 5 (5') is connected to the blade 1 (1') and the rotating center body 7 (
7').

Then, the rotor is completed by accurately processing the cylindrical surface of the close body 14 (14') using a broach, a square cutter, etc.

The fixed center bodies 5 (5') are fixed to the casings at both ends of the blade 1 (1'), and extend from both ends of the blade 1 (1') to the close body 14 (14'). (of course, it is a cantilever beam with one end fixed).

In manufacturing the upper rotor in FIG. 7, as shown in FIG. 12, the blade 1a integrated with the close body 14 (same cross section as in FIG. 8) is used as the center of rotation. The blades 1b, 1c (
(The rotor is the same as the cross section in FIG. 9, and does not include the close body 14), and may be firmly connected together with bolts or the like (the same is true for the lower rotor in FIG. 7).

In addition, in FIG. 7, high-pressure fluid may leak from the close contact area between the end surface of the fixed central body 5 (5') and the close contact body 14, but in order to prevent this, the parts shown in FIG. As shown in an enlarged view, an annular projection (18) is formed on the end surface of the fixed center body 5 (5') and protrudes from this end surface, and the end surface and the annular projection 18 are closely connected to each other. ), and since the high-pressure fluid inside the fixed center body 5 (5') must leak out through a complicated, tortuous path, sealing performance is improved and leakage loss is reduced. Decrease.

Next, the present invention is similarly applied to the non-contact rotating machine shown in FIG. 4, and if FIG. This is as shown in FIG. 14, and the cross-sectional view corresponding to the lines BB' and C-C' is as shown in FIG. 15.

14 is a close body having a circumferential surface that is in close contact with the outer circumferential surface of the mating rotor.

Further, FIG. 16 shows a side view of an embodiment in which the present invention is applied to the non-contact rotating machine shown in FIG. 5.

That is, if we pay attention to the blade 1 of the rotor on the upper stage side in FIG. The center body 7 is inserted and brought into contact with the close body 14 and the blade 1.
and the rotational center body 7 are firmly and integrally connected (by bolts, welding, etc.), and the close body 14 has a cylindrical surface that comes into close contact with the outer circumferential surface (blade outer circumferential surface 2') of the mating rotor, The process center body 5 is arranged to extend from both ends of the blade 1 to the close body 14, and thus the blade 1 and the rotation center body 7 are connected (the same applies to the lower rotor). ).

In FIG. 7, the center of rotation 7 is used when functioning as a pump.
The fluid discharged into (7') flows out only from one end of the rotating center body, and when it functions as an expander, it flows in only from one end of the rotating center body 7 (7'). However, it is also possible to configure it so that it flows out or flows in from both ends of the rotation center body 7 (7'), and this is shown in FIG. 17.

(Effects of the Invention) As described above, in the present invention, since the blade 1 (1') and the rotation center body 7 (7') are integrally connected at the intermediate position of the blade (usually at the center of the blade), the blade The fixed center bodies 5 (5') are inserted from both end sides of the fixed center bodies 5 (5'), and the length of each fixed center body 5 (5') (more precisely, the length that receives the fluid pressure in the working chamber) is different from that of the conventional one. (Conventionally, the blade and the rotating center body are integrally connected at the end of the blade, so the fixed center body can only be inserted from one side of the blade.)

That is, in FIG. 6, assuming that the length of the blade 1 (1') is the same, the length corresponding to l'1 is equivalent to being shortened to less than half as a result.

As mentioned above, the deflection of the fixed center body 5 (5') is 4 of l'1.
and therefore according to the invention, the fixed central body 5 (
5') will be reduced very significantly.

In this way, the rigidity of the fixed center body 5 (5') is significantly increased,
Fixed center body 5 (5'), blade 1 (1') and rotating center body 7
(7') can be significantly reduced and leakage loss can be reduced.

Also, if you think about it conversely, the length of the blade 1 (1') can be increased compared to the conventional one while maintaining sufficient rigidity of the fixed center body 5 (5').
(more than double), it becomes possible to manufacture large-capacity non-contact rotating machines.

[Brief explanation of drawings]

Figures 1, 3, 4, and 5 are diagrams of a conventional non-contact rotating machine according to the present invention, Figure 2 is a side view of Figure 1, and Figure 6 is the relationship between the load and deflection acting on the fixed central body. Principle diagram showing the 7th
・Figures 11, 12, 13, 16, and 17 are diagrams showing a method of coupling the blades of the non-contact rotating machine and the rotation center body according to the present invention,
Fig. 8 is a sectional view taken along line A-A' in Fig. 7, Fig. 9 is a sectional view taken along line B-B' and C-C' in Fig. 7, and Fig. 10 is a diagram of the tool.
14 and 15 are cross-sectional views showing various parts of a side view to which the present invention is applied to FIG. 4. 1 and 1' are the blades, 2 and 2' are the outer peripheral surfaces of the blades, 3 and 3' are the inner peripheral surfaces of the blades, 4 and 4' are the blade side plates, 5 and 5' are the fixed center body, and 6 and 6' are the communication ports. , 7 and 7' are the centers of rotation, and 8 and 8'
is the opening/closing port, 9 and 9' are the working chambers, 10 and 13 are the passages, and 11
・11' is a missing circular part, 12 is a depressed part, 14 and 14' are close bodies, 15 and 15' are bolts, 16 is a cutting edge, 17 is a tool, 18 is an annular projection, C1, C2, C3, C4. l1・l
2, l3, and l4 are lines, and 1a, 1b, and 1c are the parts into which the blade is divided.

Claims (2)

[Claims] (1) At least one rotor of a pair of rotors synchronously rotating in opposite directions without contacting each other is in close contact with the outer peripheral surface of a fixed center body fixed outside the rotation center body. Focusing on the blade of the rotor on the fixed center body side of a non-contact rotating machine configured to have a blade that rotates integrally with the rotation center body, a close body located at an intermediate position of the blade is integrated with the blade. A rotating center body is inserted into and brought into contact with the inner circumferential surface of the close body, so that the close body, the blade, and the rotation center body are firmly and integrally connected,
The close body has a cylindrical surface that comes into close contact with the outer circumferential surface of the mating rotor, and the fixed center body is provided so that it extends from both ends of the blade to the close body, thus connecting the blade and the center of rotation. A method for connecting a blade of a non-contact rotating machine to a rotating center body, which is characterized by connecting the blades to the body. (2) A patent claim in which an annular projection protruding from the end surface of the fixed center body is formed, and the end surface and the annular projection are brought into close contact with each other to improve sealing performance. A method for coupling a blade of a non-contact rotating machine and a rotating center body according to item 1.