JPS62321B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positive displacement axial flow rotary piston that can be used as a pump, compressor, flow meter, actuator, fluid motor, or the like.

IMO pumps, Quimby pumps, and the like are widely known as fluid machines using such rotating pistons. In addition, this type of rotating piston is
It is known that it can also be used as a positive displacement flow meter, actuator, hydraulic motor, etc.

Therefore, in the conventionally known rotary piston of this type,
A single male spiral body is provided in the center of the housing,
One female helix is arranged on each side of the coil.

The male helix and the female helix are usually epitrochoid tooth-shaped bilobal, two-mouth screw gears with the same pitch diameter and leads, but
The male spiral body is a screw-like addendum gear with teeth formed in a trochoidal tooth profile between the tip circle and the pitch circle, and the female spiral body has teeth formed in a trochoidal tooth profile between the pitch circle and the root circle. It is a threaded dedendum gear.

The ratio of the diameter of the tip of the male helix, the pitch diameter common to both helices, and the root diameter of the female helix is usually 5:3:1.

At least a complete continuous fluid seal line is formed by the meshing portions of the two female spiral bodies that mesh with the one male spiral body, and the tips of the teeth of the three spiral bodies and the inner surface of the corresponding spiral body chamber. Two or more stages are formed. Using this rotating piston as a pump means that the rotation is transmitted from the power source outside the housing to the male helical body, and the fluid that flows into the housing from the inlet is transferred to both spiral bodies inside the helical body chamber. It is pressurized and discharged in the direction of the main axis of the body and discharged from the outlet.

This type of pump is a pump for transporting high viscosity oil such as heavy oil or lubricating oil, a lubricating oil pump for machine tools,
It is widely used as a hydraulic oil pump for hydraulic equipment, a fuel injection pump, etc.

Therefore, the present invention has been made to improve this type of rotary piston and make it even smaller, lighter, and more efficient.

The objects of the present invention are, first, to provide a rotary piston that can be used as an improved IMO type pump that is smaller in diameter, lighter, and more efficient than conventional ones; The object of the present invention is to provide a rotary piston that has higher efficiency than other rotary pistons of this type and can be actually used as a positive displacement flowmeter or a fluid motor.

Therefore, the gist of the present invention is to center one female helix and arrange a plurality of male helices around it.

That is, whereas the conventional one has a single male spiral body provided at the center of the casing and a plurality of female spiral bodies that engage with the male spiral body around the male spiral body, the present invention The product has a female spiral body provided at the center of the casing, and a plurality of male spiral bodies that engage with the female spiral body around the female spiral body.

Therefore, the male helical body and the female helical body used in the present invention are usually threaded gears having an epitrochoid or cycloid tooth profile with the same pitch diameter and lid, and the male helical body is threaded. The female helix is a threaded addendum gear. These may be monolobular or bilobal or multilobal.

Further, in the present invention, one female helix and two or three male helices are usually combined.

In addition, in this specification, the term trochoidal tooth profile refers not only to a tooth profile in which the tooth profile curve in the section perpendicular to the axis consists only of a complete trochoid, a cycloid, or a curve parallel to these, but also a part of the tooth profile that is a circular arc or other non-trochoid. It shall also include those that include dental impressions.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of the rotary piston according to the present invention used as a pump, FIG. 2 is an enlarged cross-sectional view showing the - cross section in FIG. 1, and FIGS. 3 and 4. 2A and 2B are enlarged cross-sectional views similar to FIG. 2 of other different embodiments, respectively.

In FIG. 1, 1, 2 and 3 are the main body, bottom and lid of the pressure vessel forming the pump housing; 4 and 5 are the housing and lid of the rotating piston; 6 is the female helix;
7 and 8 support the male helix, 9 supports the female helix,
The driving main shaft, 10 and 11 are support shafts for the female spiral bodies 7 and 8, 12, 13 and 14 are pilot gears, 15 is a tightening fitting for tightening the gland packing 16, 17, 18 and 19 are bolts, 20 and 2
1 is a gasket.

The main body 1 has an inlet 1a and an outlet 1b, and a rotary piston casing 4 and a lid 5 are attached therein. The housing 4 and lid 5 of the rotating piston include
A large number of fluid flow holes 4a, 4a, 5a, respectively.
5a is provided.

A cross-section perpendicular to the axis of the rotating piston portion is shown in FIG. In this embodiment, both male and female helical bodies are single-lobed screw gears. The female spiral body 6 includes a pressure vessel lid body 3 and a rotating piston housing 4 with a cocoon-shaped cross section.
It is fixed to a main shaft 9 passing through the center of the lid 5 and rotatably supported at the center of the casing 4 . The pair of male spiral bodies 7 and 8 are fixed to support shafts 10 and 11, respectively, which are parallel to the main shaft 6, and are rotatably supported within a male spiral body chamber provided in the housing 4.

An appropriate distance between the axes is provided between the female helical body 6 and the male helical body 7 or 8 so that their pitch cylinders face each other, so that one of them cannot be rotated. When one tooth is rotated, the rotation of the other is transmitted through the tooth surface.
In this embodiment, the pilot gear 1 is installed outside the housing.
2, 13, and 14 are provided so that rotation can be transmitted between the female spiral body 6 and the male spiral body 7 or 8 also through these.

Therefore, the female spiral body 6 and the female spiral body interior wall 4a
Appropriate minute gaps are provided between the male helical bodies 7 and 8 and the internal walls 4b and 4e of the female helical body, respectively. According to arrow A in the figure
When the pumps are rotated in the direction indicated by the arrow in the figure, they rotate smoothly while engaging with each other, and the fluid inside the pump housing flows in the direction of the arrow in the figure.

Next, to explain the effects of the present invention, the product of the present invention has a larger discharge amount per rotation than a conventional product of approximately the same type.

Now, when comparing the product of the present invention and a conventional rotary piston using a helical body of the same shape and size, in the case of this example, at the same rotation speed, the product of the present invention is more than twice that of the conventional product. In the embodiment shown in Fig. 4, which will be described later, the amount of liquid pumped is actually 3.
The amount of liquid pumped can be more than doubled.

That is, the displacement per rotation of this type of rotary piston is the flow path cross-sectional area obtained by subtracting the axis-perpendicular cross-sectional area of each helical body from the axis-perpendicular cross-sectional area of the space inside the housing, that is, the spiral body chamber. It is found by multiplying the lead of the spiral body.

Therefore, while the conventional product uses one male helix and two female helices, the product of the present invention uses two or three male helices and one female helix. It uses

Therefore, the cross-sectional area of the flow path has little to do with the number of female spiral bodies used, and is approximately proportional to the number of female spiral bodies used. Compared to known IMO pumps constructed using a helical body with the same pitch diameter, root diameter, tip diameter, and lead as the helical body used for this purpose, the liquid delivery capacity is double or triple. It has the following.

However, when using the same helical body, the product of the present invention is somewhat larger than the conventional product, but even when compared between products that have approximately the same weight, installation area, maximum dimensions, etc., the product of the present invention The product has a liquid delivery capacity of 1.5 to 2 times or more than conventional products.

Next, FIG. 3 will be explained. FIG. 3 is a cross-sectional view of a rotating piston when a bilobal, two-end threaded gear is used as the helical body, and 6' is a female helical body;
7' and 8' are male helices.

In this embodiment, the cross-sectional area of the flow path is slightly smaller than that shown in FIG. , or is recommended for low viscosity fluids.

Next, FIG. 4 will be explained. FIG. 4 is a cross-sectional view of a rotating piston consisting of three male spiral bodies arranged around one female spiral body, and in the figure,
23 is a female spiral body, 24, 25 and 26 are male spiral bodies, and this four-helix type rotary piston is installed in the pump housing like the three-helix type rotary piston in FIG. 1 described above. , is what is used.

In this example, each spiral body is shown as having a monolobal shape, but it is also possible for all of these spiral bodies to have a trilobal shape.

This four-helical rotary piston is a known
It has a liquid pumping capacity that is more than three times that of the IMO pump, and it also has a liquid pumping capacity that is more than 1.5 times that of the three-helical rotary piston shown in Figures 2 and 3 above. However, since this can be housed in a pump housing that has approximately the same size and shape as the pump housing that houses the three-helical rotary piston, this embodiment is extremely compact, lightweight, and has a large capacity. A pump can be configured. This type of pump is recommended for fluid transportation and cargo handling, especially as a marine pump for cargo tankers and the like.

Since the present invention is constructed as described above, it is possible to provide a positive displacement axial flow type rotary piston that has an extremely small diameter, is lightweight, has a large capacity, and is highly efficient.

In addition, although only an example in which the rotary piston according to the present invention is used as a screw pump is shown above, the use of the product of the present invention is not limited to this, and the product is driven by fluid energy. Even when used in equipment, the rotary piston according to the present invention is smaller and lighter than known rotary pistons using a spiral body with the same specifications, and
Higher output torque and volumetric efficiency can be obtained at the same output shaft rotation speed, and it can be widely used as a positive displacement flowmeter, an integrating volume meter, an actuator, or a fluid motor.

Further, the pilot gear shown in the above embodiments is not an essential component for the configuration of the present invention, and may be omitted depending on the application.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the rotary piston according to the present invention used as a pump, FIG. 2 is an enlarged cross-sectional view showing the - cross section in FIG. 1, and FIGS. 3 and 4. 2A and 2B are cross-sectional views similar to FIG. 2 in other different embodiments. DESCRIPTION OF SYMBOLS 1... Body of pressure vessel, 4... Housing of rotating piston, 5... Lid of rotating piston, 6, 23... Female spiral body, 7, 8, 24, 25, 26... Male spiral body,
9... Main shaft, 12, 13, 14... Pilot gear.

Claims (1)

[Scope of Claims] 1. Threaded addendum gear types that have trochoidal or cycloidal tooth profiles and are meshed so that their pitch circles are in rolling contact with each other and a fluid seal is established between both tooth surfaces. a male helical body and a female helical body in the form of a threaded dedendum gear, and a helix defined by the cylindrical surfaces of the tooth tips of the male helical body and the female helical body and both end surfaces thereof, and in which the male helical body and the female helical body are accommodated. a body chamber, a fluid inlet, a fluid outlet, an inlet channel that communicates the fluid inlet with one end of the spiral body chamber, and another end of the spiral body chamber with the fluid outlet; A positive displacement axial flow type comprising a casing equipped with an outlet flow path communicating with the casing, a rotation device provided outside the casing, and a rotation transmission device provided between the spiral body and the rotation device. In the rotating piston, one female spiral body is arranged in the center of the housing,
Multiple male helices are arranged around the helix,
The above-mentioned positive displacement axial flow rotary piston characterized by being in mesh with each other. 2. The positive displacement axial flow rotary piston according to claim 1, wherein the male helical body and the female helical body are both monolobal screw gears. 3. The positive displacement axial flow rotary piston according to claim 1, wherein the male helical body and the female helical body are both bilobal screw gears. 4 Claim 1, wherein two male spiral bodies are arranged around the one female spiral body.
The positive displacement axial flow rotary piston according to item 1, 2 or 3. 5. Claim 1, wherein three male spiral bodies are arranged around the one female spiral body,
The positive displacement axial flow rotary piston according to item 2 or 3.