JPH0125909B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positive displacement fluid machine generally referred to as a C-ring pump or scroll pump.

For example, the above-mentioned C-ring type pump is known as this type of fluid machine, but in the case of this C-ring type pump, one end communicates with the inlet and the other end communicates with the outlet on the end face of the case. A C-shaped groove is provided, and a disk fitted with a lid on the open end surface of the C-shaped groove is loosely fitted between the inner surfaces of the C-shaped groove, and
A C-shaped blade whose tip surface slides in sliding contact with the bottom surface of the C-shaped groove is provided, and at least one of the inner circumferential surface and the outer circumferential surface of the C-shaped groove is in contact with the inner surface of the C-shaped groove. The C-shaped groove is filled by placing the C-shaped blade eccentrically by a predetermined distance from the center of curvature of the C-shaped groove so as to make contact therewith, and causing the C-shaped blade to perform a sliding motion along its eccentric trajectory. The pump unit includes a pump unit configured to move fluid from the inlet side to the outlet side. Below, such C
The explanation will focus on a ring type pump, but according to a fluid machine with such a configuration, a plurality of pump units are connected in series, and the C-shaped blades of each unit are shifted in phase from each other by a required angle. By enabling synchronous operation in different states, it is possible to construct a positive displacement pump without pulsation, and conversely, by introducing fluid into each of the units, C of each of these units
By forcibly operating shaped blades and making the operating force available to the outside, it is possible to construct flowmeters with low pressure loss and motors that operate stably over a wide range of speeds from high to low. It is possible.

However, in the conventional type, the inner circumferential surface and outer circumferential surface of the C-shaped blade and both inner circumferential surfaces of the C-shaped groove are respectively cylindrical surfaces, so there is a problem that mass production is difficult. That is, if the inner and outer circumferential surfaces and the inner surface are respectively cylindrical surfaces formed by generatrix lines parallel to the axis of the unit, draft cannot be ensured, so the C-shaped blade or the C It is extremely difficult to manufacture a case with shaped grooves by mold processing. Therefore, at least the cylindrical surface portion has to be formed by machining, which is troublesome, and there is an inconvenience that it takes time and effort to manufacture.

In addition, in the case of such a cylindrical surface, the contact area between the inner and outer circumferential surfaces of the blade and the inner surface of the groove, and the contact area between the tip surface of the blade and the bottom surface of the groove perform sealing to expand and contract the volume. It is beginning to form a space. However, in conventional methods, the outer and inner ends of the blades and grooves are generally angular, so there is a serious problem that the continuity of the seal is easily lost at the corners. There is. In other words, it is possible to ensure appropriate sealing performance at the contact area between surfaces by improving the accuracy of surface processing or by providing a special sealing member, but concave corners and convex corners It is difficult to accurately seal the two. Even if such a seal can be achieved, the corners are likely to wear due to use and the sealing performance will deteriorate. For this reason, conventional blades and grooves in which the outer and inner ends are angular have a problem in that it is difficult to maintain desired performance over a long period of time.

The present invention has been made in view of the above-mentioned circumstances, and includes a structure in which the outer circumferential surface and inner circumferential surface of a C-shaped or spiral-shaped blade are formed such that the thickness of the C-shaped or spiral-shaped blade gradually decreases toward the tip. and inclining each inner surface of the C-shaped or spiral-shaped groove so that its generatrix is parallel to the generatrix of the outer circumferential surface or inner circumferential surface of the corresponding C-shaped or spiral-shaped blade; The radius of curvature R has a relationship of t/10≦R≦t/2 at the corner portions of the outer and inner ends of each of the C-shaped or spiral-shaped wing and the C-shaped or spiral groove. An object of the present invention is to provide a positive displacement fluid machine that can effectively eliminate the above-mentioned disadvantages by providing a section.

Here, t is the thickness of the tip of the blade. The reason why the radius of curvature R of the rounded portion is limited as described above is as follows. That is, when the radius of curvature R is made smaller than t/10, the corner portions of the blade and the groove become substantially angular;
The continuity of the seal is likely to be lost at the corners due to wear. On the other hand, if the radius of curvature R is made larger than t/2, the tip of the blade becomes sharp, which is not preferable. That is, when the radius of curvature R is set to t/2, the tip of the blade has a semicircular arc shape in cross section. Therefore, if the radius of curvature R is made larger than this, the tip of the blade becomes discontinuous and becomes prone to wear.

Hereinafter, an embodiment in which the present invention is applied to a C-ring type pump will be described with reference to FIGS. 1 to 4.

A first pump unit A and a second pump unit B are connected in series. Each pump unit A, B has C-shaped grooves 3, 4 opened in one end surface 1a, 2a of the cases 1, 2;
from the disks 5, 6 which are capped on the opening end surfaces of the C-shaped grooves 3, 4, loosely fitting between the inner surfaces 7, 8, 9, 10 of the C-shaped grooves 3, 4;
And, the tip surfaces 11 and 12 are connected to the C-shaped grooves 3 and 4.
C-shaped blades 15, which slide in liquid-tight contact with the bottom surfaces 13, 14 of the
16 are integrally protruded, and these C-shaped wings 15, 16
the C-shaped groove 3 such that at least one of the outer circumferential surfaces 17, 18 and inner circumferential surfaces 19, 20 of the C-shaped blades 15, 16 abuts the inner surfaces 7, 8, 9, 10 of the C-shaped groove. , 4 are arranged eccentrically by a predetermined distance from the center of curvature 0, and the C-shaped blades 15, 16 are made to perform an orbital circular motion along their eccentric orbits. The C-shaped grooves 3 and 4 each have a 3/4+α arc shape, and each one end communicates with the inflow ports 21 and 22, and each other end communicates with the outflow ports 23 and 24. Then, the outflow port 23 of the first pump unit A is connected to the inflow port 2 of the second pump unit B.
Connected to 2. In addition, the C-shaped blades 15, 16
is a 3/4+α circular arc, and the C-shaped groove 3,
The radius of curvature of the outer inner surfaces 7, 9 of the C-shaped grooves 3, 4 at a predetermined depth position of 4 is r ₁ , the radius of curvature of the inner inner surfaces 8, 10 of the C-shaped grooves 3, 4 is r ₂ , the C-shaped blades 15, 16 If the average radius of curvature of is r ₃ , then r ₃ = (r ₁ + r ₂ )/2
The shape and dimensions are set so that the following relational expression holds true. Then, the C-shaped blades 15 of the first pump unit A and the C-shaped blades 16 of the second pump unit B are caused to synchronously move in a synchronous manner with their phases differing by 90 degrees. . In addition, here, the misosuri movement refers to each of the C-shaped blades 15, 1.
Each part of 6 is the width dimension (r ₂ - r ₁ ) of the C-shaped grooves 3 and 4.
This means performing a circular motion with a diameter corresponding to the value obtained by subtracting the width w of the C-shaped blades 15 and 16 from . A specific configuration for causing each of the C-shaped blades 15 and 16 to perform a sliding motion is, for example, by arranging both the pump units A and B back to back with their axes aligned, and having a common axis at the center of the pump units A and B. axis of rotation 26
The eccentric cams 27 and 28 are inserted into the rotating shaft 26 so as to be integrally rotatable with each other, and the eccentric cams 27 and 28 are attached to the disks 5 and 6.
The disks 5 and 6 are rotatably fitted into shaft holes 29 and 30 drilled in the disks, and the rotating shaft 26 is rotated to cause the disks 5 and 6 to move circularly along eccentric orbits.

Further, the outer peripheral surfaces 17, 1 of the C-shaped blades 15, 16
8 and inner circumferential surfaces 19, 20, the C-shaped blades 15, 1
6 is inclined so that the thickness thereof gradually decreases toward the distal end. Further, the inner surfaces 8, 10 on the inside of the C-shaped grooves 3, 4 are arranged such that the generatrix thereof is the C-shaped blade 15, 16.
The outer inner surfaces 7, 9 of the C-shaped grooves 3, 4 are inclined so that the generatrix is parallel to the generatrix of the inner circumferential surfaces 19, 20 of the C-shaped blade.
It is tilted so as to be parallel to the generatrix lines of numbers 7 and 18. Each of the generatrix lines has a straight line at the center and an approximately 1/4 arc line at both ends, and each of the inner surfaces 7, 8, 9, 10, the outer circumferential surface 17,
18, and rounded portions 7a, 8a, 9 at each outer corner portion and inner corner portion of the inner peripheral surfaces 19, 20, respectively.
a, 10a, 17a, 18a, 19a, and 20a are formed.

That is, the corners of the outer and inner ends of the C-shaped blades 15, 16 and the C-shaped grooves 3, 4 have a radius of curvature R of t/10≦R≦t/2. Rounded portions 7a, 8a, 9a, 10a, 17a,
18a, 19a, and 20a are formed. Here, t indicates the thickness dimension of the tip portions of the C-shaped blades 15 and 16.

If it has such a configuration, the C-shaped blade 15,
The outer circumferential surfaces 17, 18 of the C-shaped blades 15, 16 are in the outer contact portion and are in line contact with the outer inner surfaces 7, 9 of the C-shaped grooves 3, 4, and the inner circumferential surfaces 19, 20 of the C-shaped blades 15, 16 are in the inner contact portion. In order to make line contact with the inner surfaces 8, 10 inside the C-shaped grooves 3, 4, the inside of the C-shaped grooves 3, 4 has a sickle-shaped inlet side formed by the C-shaped blades 15, 16. Spaces 3a, 4a and space 3 on the outlet side
It is divided into 4b and 4b. From this state, the rotating shaft 26 is rotated in the direction of arrow X to
When the shaped wings 15 and 16 are made to perform a misosuri motion,
Since the outer contact portion and the inner contact portion move from the inflow ports 21, 22 to the outflow ports 23, 24 side along the inner surfaces 7, 8, 9, 10 of the C-shaped grooves 3, 4, respectively, the two spaces 3a, 3b, 4a, and 4b will also move in the same direction, and these spaces 3
The fluid filling a, 3b, 4a, and 4b is transported from the inlet ports 21 and 22 side to the outlet ports 23 and 24 side. In addition, in the process of the C-shaped blades 15 and 16 performing a sliding motion, there is a period when the external contact portion temporarily disappears (see the first pump unit A in FIG. 4) and a period when the internal contact portion temporarily disappears. (2nd pump unit B in Figure 3)
) will be visited regularly. however,
Since the phases of the grinding motions of the C-shaped blades 15 and 16 are made different between the first pump unit A and the second pump unit B so that these timings do not overlap, Pump unit A
A situation in which the inlet 21 of the pump unit B and the outlet 24 of the second pump unit B communicate with each other through the C-shaped grooves 3 and 4 without any resistance cannot occur even for a moment. Therefore, if it is like this, the inflow port 21
The fluid sucked in from the C-shaped grooves 3 and 4 is reliably guided to the outlet 24 through the C-shaped grooves 3 and 4, and is sequentially discharged from the outlet 24 without using any valves or the like. It is something that can be operated by

Note that the above embodiments are for the case where the fluid machine according to the present invention is used as a pump, but conversely, if the fluid is made to flow through each of the units, this fluid machine can be used as a flow meter or a motor. It can be used as

Further, in the above embodiment, a case was explained in which two sets of units were connected in series, but the present invention includes a case having only one set of units, a case having three sets of units, and a case having three sets of units.
It also includes units equipped with more than one set.

Furthermore, the present invention can also be applied to a spiral pump (scroll pump) or a motor equipped with a unit consisting of a combination of spiral blades and grooves, as described above. An example of this spiral fluid machine is shown in JP-A-51-104609, "Compressor for Compressible Media."

As described above, the present invention provides the corner portions of the outer and inner ends of the C-shaped or spiral-shaped blade and the C-shaped or spiral groove, respectively, with t/10≦R≦t/2. Since the radiused portion has the following relationship, the contact seal portion between the blade and the groove becomes smoothly continuous. Furthermore, the problem that the corner portions are deformed due to wear and the sealing performance of the portions is deteriorated is less likely to occur. Therefore, the excellent effect of being able to maintain high efficiency over a long period of time can be obtained.

Further, the inner and outer circumferential surfaces of the C-shaped or spiral-shaped blade are inclined such that the thickness of the C-shaped or spiral-shaped blade gradually decreases toward the tip, and each inner surface of the C-shaped or spiral groove is Since the generatrix is inclined so as to be parallel to the generatrix of the inner and outer circumferential surfaces of the opposing C-shaped or spiral-shaped blades, the C-shaped or spiral-shaped blades are brought into line contact with the inner surface of the C-shaped or spiral groove. It is possible to perform a misosuri movement in a state in which the device is held in place, and in principle, it can perform the same functions as conventional devices. Furthermore, if the inner and outer circumferential surfaces of the C-shaped or spiral-shaped blades and the inner surfaces of the C-shaped or spiral grooves are sloped as described above, the slopes can be used as draft angles during mold processing. As a result, demolding becomes extremely easy, and a case having the C-shaped or spiral grooves and a disk having the C-shaped or spiral blades can be manufactured easily. Therefore, when performing mass production, it is possible to significantly reduce costs. Furthermore, by making the C-shaped or spiral-shaped blade into a tapered shape as described above, it is possible to ensure the necessary rigidity even if the C-shaped or spiral-shaped blade is made relatively thin.
Another advantage is that the weight of the unit can be reduced.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with FIG. 1 being a schematic sectional view, FIG. 2 being an enlarged explanatory view showing the main parts, and FIG.
FIG. 4 is a diagram explaining the principle. A, B...Unit (pump unit), 1, 2
...Case, 3, 4...C-shaped groove, 5, 6...Disk,
7, 8, 9, 10... Inner wall, 11, 12... Tip surface, 13, 14... Bottom surface, 15, 16... C-shaped blade, 1
7, 18...outer peripheral surface, 19,20...inner peripheral surface, 21,
22... Inlet, 23, 24... Outlet, 7a, 8
a, 9a, 10a, 17a, 18a, 19a, 2
0a...R section.

Claims (1)

[Claims] 1. A C-shaped or spiral groove is provided on the end face of the case, one end communicating with the inlet and the other end communicating with the outlet, and a lid is attached to the open end face of the C-shaped or spiral groove. A C-shaped or spiral-shaped wing is protruded from the C-shaped or spiral-shaped disc, and is loosely fitted between the inner surfaces of the C-shaped or spiral-shaped groove, and whose tip surface is in close contact with the bottom surface of the C-shaped or spiral-shaped groove. or a spiral blade from the center of curvature of the C-shape or spiral groove such that at least one of the inner peripheral surface and the outer peripheral surface of the C-shape or spiral blade abuts the inner surface of the C-shape or spiral groove. By arranging the C-shaped or spiral-shaped blades eccentrically by a predetermined distance and causing them to perform a diagonal movement along the eccentric trajectory, the fluid filling the C-shaped or spiral-shaped groove is directed toward the inlet side. A positive displacement fluid machine comprising a unit configured to be able to move from the C-shaped or spiral-shaped blade to the outlet side, the outer peripheral surface and the inner peripheral surface of the C-shaped or spiral-shaped blade The thickness of the blade is inclined so that it gradually decreases toward the tip, and each inner surface of the C-shaped or spiral groove is set so that its generatrix line is the generatrix of the outer peripheral surface or inner peripheral surface of the corresponding C-shaped or spiral blade. and the radius of curvature R is t/10≦at the corner portions of the outer and inner ends of the C-shaped or spiral-shaped blade and the C-shaped or spiral groove, respectively. A positive displacement fluid machine characterized by forming a radiused portion having the relationship R≦t/2 (t is the thickness of a blade tip).