JPH03115789A - Contactless rotary pump - Google Patents

Abstract

PURPOSE:To improve the overall adiabatic efficiency by flowing the fluid in a space pinched by the vane side surface of the advancing side of one rotor and a part near the lagging end of the vane peripheral surface of the other rotor and a fixed central member into the discharging side space in the fixed central member. CONSTITUTION:The fluid in a space (an actuation chamber 7 under the condition that the tip of a line C2 comes to close a line C3) pinched by the vane side surface (a part corresponding to the line C2) of the advancing side of one rotor and a part near the lagging end of the vane peripheral surface 2' of the other rotor and a fixed central member 5 is flowed into the discharging side space in the fixed central member 5 through a discharging side communicating port 11 with the rotation of rotors 3, 3'. The fluid resistance at the time that the fluid in the actuation chamber 7 is pushed out to the outside is therefore never increased even if a clearance between the tip of the line C2 and the line C3 is contracted to about 1mm. Consequently, since a closed space can be reduced more, the overall adiabatic efficiency is improved remarkably, and an energy source for generating the noise is made small and the noise is restrained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to a rod having blades that rotates in close contact with the outer peripheral surface of a fixed central body, in which rotors are each configured in a non-contact state with each other. It is related to a non-contact rotary pump that rotates in opposite directions synchronously, and in detail, it closes without increasing the flow resistance of the fluid when it flows out from or flows into the space between the rotor tooth profiles. It relates to a device that reduces the volume of the enclosed space, improves the total insulation effect, and reduces noise.

(Prior Art) In order to understand the present invention, a non-contact rotary pump according to the present invention, which is already known, will be explained.

In FIG. 1, each rotor has blades 1 and 1' that rotate in close contact with the outer circumferential surface of a fixed central body 5 and 5' that are fixed (to the casing), and the blade outer circumference that is in close contact with the inner circumferential surface of the casing. The surface 2 (2') is configured to be in close contact with the fixed center body 5' (5) on the other rotor side, and thus each rotor is synchronously opposed to each other by a synchronous gear (not shown) in a non-contact state. They rotate one rotation in each direction.

Furthermore, as shown in FIG. 2, the tip of the side surface of the blade of one rotor (corresponding to line C3 in the figure) is separated from the fixed center body 5 (if a notched portion 6 is formed, this notched portion 6 At the moment of separation (from the wall), the blade side of the rotor (
At the latest, the tip of the line (corresponding to line C2 in the figure) reaches the fixed center body 5' (or the wall surface of this omitted circular part 6' if it is formed from the omitted circular part 6'). As a result, communication between the pump discharge side (inside the discharge passage 9 and the part communicating therewith) and the pump suction side (inside the suction passage 8 and the part communicating therewith) is cut off,
It will function as a pump.

Lines C2 and C4 may be opened by the tip of line C3 and the tip of line C1, respectively. The gap at the closest part between the parts corresponding to line C1 and line C4 is the same as the blade outer circumferential surface 2 (2').
) and the inner peripheral surface of the casing (usually 0.05~0.
If it is made relatively large enough (usually about 1 to 4 mm), there is no need to precisely process line C2 and line C4, and the tooth shape can be used as a tooth profile as it is by casting or injection molding. Since it can be used, manufacturing becomes easy.

That is, in general, there is a gap between the tip of line C3 and line C2 when they are closest together, a similar gap between the tip of line C2 and line C3, and a gap between the tip of line C1 and line C4. It is preferable that the gaps are relatively sufficiently larger than the gap between the outer circumferential surface 2 (2') of the blade and the inner circumferential surface of the casing.

Now, paying attention to the working chamber 7 (7') sandwiched between the blades 1 and 1' of each rotor, the fluid sucked into the working chamber 7 (7') from the suction passage 8 flows into the working chamber 7 (7'). (7')
is communicated to the pump discharge side (inside the discharge passage 9) from the maximum volume state of The fluid trapped in the containment space 10 is released to the pump suction side.

In general, the fixed center bodies 5 and 5' have blade outer peripheral surfaces 2' and 5', respectively.
Although it is desirable to form cutout portions 6 and 6' in which the portions 2 are in close contact with each other face-to-face, these are not essential (see FIG. 3).

In this case, in FIG. 3, the blade outer circumferential surface 2' is in close contact with the outer circumferential surface of the fixed center body 5, and the blade outer circumferential surface 2 is in close contact with the outer circumferential surface of the fixed center body 5', so the tip of the line C3 If the tip of the line C2 is about 1 mm away from the center connection line (t≒1), the gap between the tip of the line C3 and the outer peripheral surface of the fixed center body 5 or the line C2 The gap between the tip of the pump and the outer circumferential surface of the fixed central body 5' is very small, and therefore, as in FIGS. 1 and 2, communication between the pump discharge side and the pump suction side is also blocked.

However, the gap between the tip of the line C3 and the line C2 is small near the tip of the line C2 (for example, about 1 mm), and is widened at a distance from this (for example, about 3 to 4 mm). The gap between the tip of C2 and line C3 is also small near the tip of line C3 (for example, about 1 mm), and widened at a distance from this (for example, 3 to 4 mm).
), it is necessary to allow fluid to flow freely through these gaps.

The relationship between the line C1 and the line C4 is also the same (for example, the gap between the tip of the line C1 and the line C4 is made small near the tip of the line C4, and widened at a distance from this, etc.) ).

Now, in the non-contact rotary pump configured as described above (which is already known as described above), the fluid in the confined space 10 (fluid at the same pressure as in the discharge passage 9) shown in FIGS. is released to the pump suction side (in the figure, 2
(emitted twice), the loss increases and noise is also emitted.

As a countermeasure to this problem, it is naturally possible to reduce the volume of the confined space 10, but to do so, line C3 in FIG.
The gap between the tip of line C1 and line C2 (the gap between the tip of line C1 and line C
4), and preferably the gap between the tip of line C2 and line C3 (also the gap between the tip of line C4 and line C1). As a result, the flow resistance of fluid when flowing through these gaps increases, and although noise decreases, loss increases,
A paradox arises in which the total insulation efficiency deteriorates.

(Problems to be Solved by the Invention) It is an object of the present invention to provide a solution to the confined space 10 without increasing the flow resistance of the fluid when it flows out from or flows into the space sandwiched between the rotor tooth profiles. The aim was to reduce the loss by reducing the volume of the heat sink, thereby improving the overall adiabatic efficiency and reducing noise.

(Means for Solving the Problems) In order to solve the conventional drawbacks, the present invention aims to connect the leading side blade side of one rotor, the portion of the blade outer peripheral surface of the other rotor near the lagging end, and the fixed center body. The fluid in the space sandwiched by the fixed center body is made to flow into the discharge side space in the fixed center body, which is formed so as to be able to communicate with the pump discharge side through the discharge side communication port formed in the fixed center body. Furthermore, in order to increase the effect, the fixed center body is inserted into the space sandwiched between the side surface of the blade on the lagging side of one rotor, the part of the outer peripheral surface of the blade of the other rotor near the leading end, and the fixed center body. The fluid is configured to flow in from the suction side space formed so as to communicate with the pump suction side through the suction side communication port formed therein.

(Example) Figure 4 shows an example of the non-contact rotary pump according to the present invention (
(see also FIG. 5 showing a side view), fixed central body 5
, 5' are formed with discharge side spaces 12, 12' that communicate with the pump discharge side via communicating passages 13, 13', respectively, and are further provided with space portions 12, 12' on the pump discharge side close to the pump discharge side ends of the wall surfaces of the circular portions 6, 6'. Discharge side communication ports 11 and 11' are formed respectively.

Therefore, the side surface of the blade on the advancing side of one rotor (the part corresponding to line C2 in the figure) and the outer circumferential surface 2 of the blade of the other rotor.
The fluid in the space sandwiched between the portion near the lagging end of ' and the fixed center body 5 (the working chamber 7 when the tip of line C3 approaches line C2) is discharged as the rotor rotates. Since it can flow into the discharge side space 12 in the fixed center body 5 which is formed to communicate with the pump discharge side through the side communication port 11, the gap between the tip of the line C3 and the line C2 Although it was conventionally about 3 to 4 mm, even if it is reduced to about 1 mm, the flow resistance when the fluid inside the working chamber 7 is pushed out to the outside does not increase at all (conventionally, the If the gap is reduced, flow resistance increases and losses increase).

The fluid that has flowed into the discharge side space 12 is sent out into the discharge passage 9.

The same is true for the discharge side space 12'.

In this way, the gap between the tip of the line C3 and the line C2 (and of course the gap between the tip of the line C1 and the line C4) can be drastically reduced, so that the confined space 1 formed in FIG.
It is possible to reduce the column product of 0' compared to the conventional method (Figs. 2 and 3).

In FIG. 4, the rotor shafts 3 and 3' pass through the fixed center bodies 5 and 5', respectively, but an embodiment in which they do not pass through is shown in FIG. 7, and the structure of the rotor on the upper side of FIG. It is shown in FIG. 8 (the structure of the lower rotor is also similar).

As is clear from the figure, the blade side plates 4 firmly fixed to both end faces of the blade 1 play the role of the rotor shaft.

In this case, as is clear from FIG. 7, when the fluid in the working chamber 7 is pushed into the discharge side space 12 from the state shown in the figure, the discharge side space 12' is moved through the discharge side communication port 11'. Since it communicates with the inside of the discharge passage 9, if a communication passage 14 is formed to communicate the discharge side spaces 12 and 12' as shown in FIG. 9, it can be used instead of the communication passages 13 and 13' in FIG. I can do things.

Next, as explained in FIG. 4, the tip of the line C3 and the line C
2, the volume of the confined space 10' is reduced by reducing the volume of the confined space 10' to form the parts 12, 12'. 10
It can also be applied to reduce the volume of '.

That is, in FIG. 10, suction side spaces 16, 16' are formed in the fixed center bodies 5, 5', respectively, and the two are communicated with each other through a communication path 14'.
16' is formed so as to be able to communicate with the water pump suction side, and the suction side communication port 15 is located close to the pump suction side end of the wall surface of the missing circular portions 6, 6' (see Fig. 4). ,15'
are formed respectively.

Therefore, the side surface of the blade on the lagging side of one rotor (for example, the part corresponding to line C3) and the outer circumferential surface 2 of the blade of the other rotor.
Fluid is introduced from the suction side space 16', which is formed so as to be able to communicate with the pump suction side via the suction side communication port 15', into the space sandwiched between the portion near the leading end of the pump and the fixed center body 5'. The tip of line C2 and line C3
The gap between the
Even if the size is reduced to about m, the flow resistance when the fluid is sucked into the space does not increase at all (conventionally, it increases and the loss increases).

In this way, the volume of the confined space 10' shown in FIG. 6 can be further reduced.

Similarly, the gap between the tip of the line C4 and the line C1 can be reduced.

It goes without saying that the suction side spaces 16, 16' may be constructed so as to communicate independently into the suction passage 8.

In the embodiment shown in FIG. 11, immediately after the working chamber 7' (7) cuts off communication with the suction passage 8, the working chamber 7' (7) is opened via the hole 17' (17) having a predetermined cross-sectional area. and the discharge side space 12' (12), and before the working chamber 7' (7) communicates with the pump discharge side (inside the discharge passage 9).
The fluid in the discharge side space 12' (12) is made to flow into the discharge side space 12' (12) to raise the internal pressure to an intermediate pressure in advance, so that the working chamber 7' (7) flows into the discharge passage 9. This has the effect of alleviating backflow compression caused by communication and suppressing noise generation.

FIG. 12 shows an embodiment in which the discharge side communication port 11 and the hole 17 are formed integrally (similarly, the discharge side communication port 11' and the hole 17' can be formed integrally). can).

In FIG. 4, each rotor is provided with one blade 1, 1', but FIG. 13 shows an embodiment in which two blades are provided.

Reference numerals 12 and 12' designate discharge side spaces, and their actions will be explained in the same manner as in FIG. 4, so their explanation will be omitted.

In this case as well, the suction side spaces 16, 16 are similar to FIG.
It is desirable to form suction side communication ports 15, 15'.

(Effects of the Invention) As described above, according to the present invention, the volume of the confined space can be increased without increasing the flow resistance of the fluid when flowing out from or flowing into the space between the rotor teeth. It can be reduced.

That is, according to FIG. 4, the volume of the confined space can be significantly reduced by reducing the gap between the tip of line C3 and line C2 (also the gap between the tip of line C1 and line C4). (Compare the confined space 10' in Figure 6 with the confined space 10 in Figures 2 and 3), and furthermore, according to Figure 10, the tip of line C2 and line C3 Since the gap between them (also the gap between the tip of the line C4 and the line C1) can be reduced, it is possible to further reduce the confined space.

Therefore, the total insulation efficiency is greatly improved, and the energy source that generates noise becomes smaller, making it possible to effectively suppress noise.

Furthermore, a pump in which the lines C2 and C4 in FIG. 1 are created by the tip of the line C3 and the tip of the line C1, respectively, is already known, but in this case, the confined space shown in FIG. The volume of 10 is considered to be the minimum (minimum loss), and the gap between the tip of line C3 and line C2 and the gap between the tip of line C1 and line C4 are 0.05 to 0.15 mm. Therefore, when the rotor rotates from the state shown in the figure, the fluid in the working chamber 7 can be allowed to flow in by forming a relief groove in the casing that is in close contact with the blade end surface. After the fluid inside has finished flowing in the rotor axial direction, it must flow out from the relief groove.
The flow resistance is large (and there is a problem that the cross-sectional area of the relief groove cannot be made very large).

If the present invention is implemented even in such a case, the total insulation efficiency can be greatly improved.

[Brief explanation of drawings]

Figures 1, 2, and 3 are diagrams of conventional non-contact rotary pumps, and Figures 4 and 3 are diagrams of conventional non-contact rotary pumps.
Figures 6, 7, 8, 9, 10, 11, and 13 are views of the non-contact rotary pump according to the present invention, Figure 5 is a side view of Figure 4, Figure 8 is a side view of the rotor in Figure 7, FIG. 12 is a diagram of a fixed center body corresponding to the one in which the discharge side communication port and the hole are integrally formed in FIG. 11. 1 and 1' are blades, 2 and 2' are blade outer peripheral surfaces, 3 and 3' are rotor shafts, 4 and 4' are blade side plates, 5 and 5' are fixed center bodies, 6 and 6' are missing circular parts, 7 and 7' are working chambers, 8 is a suction passage, 9 is a discharge passage, 10 and 10' are confined spaces, and 11 and 10' are confined spaces.
11' is a discharge side communication port, 12 and 12' are discharge side spaces,
13 and 13' are communication passages, 14 and 14' are communication passages, and 15 and 14' are communication passages.
15' is the suction side communication port, 16 and 16' are the suction side space group,
17 is a hole, 17' is also a hole, and C1, C2, C3, and C4 are lines.

Claims (3)

[Claims] (1) Each rotor is composed of a rod having blades that rotate while closely touching the outer circumferential surface of a fixed fixed center body, and the outer circumferential surface of the impeller closely contacting the inner circumferential surface of the casing is the fixed center of the other rotor. The rotors, each configured to be in close contact with the body, synchronously rotate in opposite directions without contacting each other, and at the moment the tip of the blade side of one rotor separates from the fixed center body, the other rotor rotates in opposite directions. The tip of the side surface of the blade is at the position near the moment when it reaches the fixed center body at the latest, so that the communication between the pump discharge side and the pump suction side is cut off, and the working chamber is kept from the maximum volume state to the pump. In a pump configured to communicate with the discharge side, the fluid in the space sandwiched between the leading-side blade side of one rotor, the portion of the blade side of the other rotor near the lagging end, and the fixed center body is A non-contact rotary pump characterized in that the fluid flows into a discharge side space in the fixed center body, which is formed so as to communicate with the pump discharge side through a discharge side communication port formed in the fixed center body. (2) A suction side communication port formed in the fixed center body into the space sandwiched between the side surface of the blade on the lagging side of one rotor, the part of the blade outer peripheral surface of the other rotor near the leading edge, and the fixed center body. 2. The non-contact rotary pump according to claim 1, wherein fluid is allowed to flow in from a suction side space in the fixed center body, which is formed to communicate with the pump suction side through the fixed center body. (3) Before the working chamber communicates with the pump discharge side, the fluid in the discharge side space inside the fixed center body is allowed to flow into the working chamber to raise the pressure inside the working chamber to an intermediate pressure in advance. A non-contact rotary pump according to claim 1 or 2.