JP2002054580A - Rotary pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary pump capable of reducing the load on a rotor and motor generated by a high viscosity of the coil in the case of low temperature, i.e., the rotary pump is to be started, and shortening the time required to raise the pump operation, without separately providing any heating means for heating the oil put fully in the pump casing. SOLUTION: The rotary pump is structured so that the rotor having a movable vane is installed rotatably inside a casing furnished with a suction hole and exhaust hole and one end of the movable vane abuts to the inner wall of the casing and rotates as following the rotation of the rotor, and thereby the fluid sucked into the casing from the suction hole is exhausted from the exhaust hole, wherein two pump working chambers are formed in such a way as put in communication to each other at least when the pump is to be started, one bounded by the movable vane, rotor and casing inner wall and the other bounded by the movable vane, rotor and casing inner wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pump for sucking and discharging a fluid such as a gas, a liquid and a viscous liquid.

[0002]

2. Description of the Related Art Rotary pumps have often been used industrially for the purpose of evacuating fluids such as gases, liquids and viscous liquids.

Hereinafter, a conventional rotary pump having two movable vanes will be described with reference to FIG.

This rotary pump has a rotor 2 centered on a rotating shaft (not shown) in a casing 1 having a suction port 6 and a discharge port 7, and a movable groove 3 in the rotor 2 A vane 4 is provided. In the rotary pump shown in FIG. 4, the movable vanes 4 are a pair of movable vanes 4.
a, 4 b are connected via a spring 5. The tip of each of the movable vanes 4a, 4b has a smooth shape corresponding to the shape of the inner wall of the casing 1, and is constantly pressed against the inner wall of the casing 1 by the spring 5.

A rotating shaft (not shown) of the rotor 2 is connected to an induction motor (motor) or the like (not shown), and by driving the motor, the rotor 2 is connected to the motor, for example. , In the direction of arrow 21.

[0006] Inside the casing 1, a contact portion between the movable vane 4 and the inner wall of the casing 1 during rotation of the rotor 2 is provided.
Oil 8 is filled to improve lubricity and vacuum sealability.

When the rotor 2 rotates in the direction indicated by the arrow 21 and the movable vanes 4a pass through the suction port 6, the movable vanes 4a and 4b and the rotor 2 and the casing 1
The pump action chambers A and B, which are areas surrounded by the inner wall of the pump, are formed.

Since the movable vanes 4a and 4b keep rotating, the volume of the pump working chamber A is increased, and the pressure is reduced. With this pressure drop, fluid is sucked from the inlet 6.

The pump working chamber A seals the fluid sucked from the suction port 6 together with the oil 8 in the pump working chamber A, and has a maximum volume when the movable vane 4b passes through the suction port 6.

On the other hand, when the movable vane 4a continues to rotate while passing through the suction port 6 and being stored in the rotor 2, the volume of the pump working chamber A decreases, and the fluid inside is compressed. Therefore, the fluid is pushed out of the casing 1 from the discharge port 7, that is, out of the pump, and is discharged.

By repeating such an operation, for example, the suction port 6 of the rotary pump can be connected to the airtight container, and the fluid (gas, liquid, viscous liquid, etc.) in the airtight container can be exhausted.

[0012]

In the conventional rotary pump, it was necessary to warm the oil before starting. This is because the lower the temperature of the oil filled in the casing, the higher the viscosity and the higher the resistance to the rotation of the movable vane.

Normally, the rotor of a rotary pump is connected to an induction motor (motor), whereby a rotational force is applied to the rotor. Therefore, when the resistance to the rotation of the movable vane is high, the resistance at the time of rotation of the rotor is high, and the load on the motor is also increased in proportion thereto.Therefore, the high viscosity of the oil at the time of starting the movable vane attached to the rotor and The motor was damaged.

At present, a commercially available rotary pump motor is provided with a safety mechanism for stopping operation under a load exceeding a predetermined value in order to prevent damage to the motor itself. However, even with such a rotary pump,
If the temperature of the oil at the time of starting is low, the load on the motor is large, and the safety mechanism is immediately activated to stop the pump. That is, there is a problem that the pump cannot be started when the oil temperature is low.

As a result, there has been a problem that a heating mechanism such as a heater must be provided in the rotary pump itself, or a heating means must be separately provided, and it takes a long time to start up the rotary pump.

According to the present invention, there is provided a rotary pump which is provided at a low temperature, that is, when the rotary pump is started, due to a high viscosity of the oil without separately providing a heating means for heating oil filled in a casing of the rotary pump. It is another object of the present invention to provide a rotary pump capable of reducing the load on a motor and shortening the time required for pump startup.

[0017]

According to the present invention, a rotor having a movable vane is rotatably mounted inside a casing having an inlet and an outlet, in order to achieve the above object.
In the rotary pump, one end of the movable vane rotates while abutting on the inner wall of the casing in accordance with the rotation of the rotor to suck fluid into the casing from the suction port and discharge the sucked fluid from the discharge port. One pump action chamber defined by the movable vane, the rotor, and the inner wall of the casing, and the other pump action chamber defined by the movable vane, the rotor, and the inner wall of the casing, communicate with each other at least when the pump is started. It proposes a rotary pump characterized by being made possible.

Thus, one pump action chamber (pump action chamber on the side where the discharge port faces) divided by the movable vane, the rotor and the inner wall of the casing, and the movable vane, the rotor and the inner wall of the casing. The other pump working chamber (the pump working chamber on the side facing the intake port) is communicated at least when the pump is started, so that the resistance to the rotation of the movable vane due to the low temperature and high clay oil is reduced. Thus, the load on the rotor and the motor can be reduced.

In order to provide the rotary pump of the present invention as described above, the movable vane employed in the rotary pump of the present invention can be configured as follows.

That is, the movable vane is formed of a vane body having a hollow portion inside and an opening in a wall facing the one pump working chamber and the other pump working chamber. An inner plate provided with a flow hole in an inner hollow portion of the vane body for communicating openings formed in a wall facing one pump operation chamber and the other pump operation chamber of the vane body. Are slidably fitted on the inner wall of the inner hollow portion of the vane body. Further, at one end of the internal hollow portion of the vane body, an elastic body for urging the inner plate toward the other side of the internal hollow portion of the vane body is provided. Inner plate supports are provided to support the inner plate and move the inner plate toward the one side of the hollow portion inside the vane body in accordance with a rise in temperature.

The force applied to the inner plate by the elastic body and the inner plate support is such that at least at the time of starting the rotary pump, the position of the flow hole of the inner plate is one of the vane members. The pump working chamber is adjusted so as to be disposed at a position where the openings provided on the wall facing the other pump working chamber communicate with each other.

Thus, at least at the time of starting the pump, the fluid compressed in one of the pump action chambers (the pump action chamber on the side facing the discharge port) defined by the movable vane, the rotor and the inner wall of the casing, or The other pump working chamber (the pump working chamber on the side facing the suction port) in which oil is partitioned by the movable vane, the rotor and the inner wall of the casing through the opening of the vane body and the flow hole of the inner plate. Therefore, resistance to rotation of the movable vane due to oil having a low temperature and high viscosity can be reduced, and the load on the rotor and the motor can be reduced.

Here, the inner plate support for supporting the inner plate has a plate shape formed by laminating metals having different coefficients of thermal expansion such as, for example, bimetals. It is supported at the other end of the internal hollow portion, and is provided at the other end of the internal hollow portion of the vane body in a state of being deformed in an arc shape toward the one side of the vane internal hollow portion. Can be.

As a result, when the temperature of the oil rises and the temperature of the inner plate support also rises, the shape of the inner plate support is deformed and the force applied from the inner plate support to the inner plate changes. Then, the inner plate moves in the hollow portion inside the vane body. Therefore,
When the pump is started, as described above, the inner plate of the vane body is located at a position communicating with the openings provided in the walls facing the one pump working chamber and the other pump working chamber. The position of the flow hole also varies.

As described above, when the temperature of the oil rises, the viscosity of the oil decreases, and the resistance to the rotation of the movable vane decreases, the communication between the openings is cut off.
The suction of fluid into the other pump working chamber (the pump working chamber on the side facing the suction port) defined by the movable vane, the rotor and the inner wall of the casing, and the movable vane, rotor and The predetermined operation of the rotary pump, that is, discharge from one of the pump working chambers (the pump working chamber on the side facing the discharge port) partitioned by the inner wall of the casing, is performed in a state where the load on the rotor and the motor is reduced. Will be started within a short time.

In order to provide the rotary pump of the present invention as described above, a bypass having an open end near a discharge port and a suction port of a casing and having a valve which is open at least when the pump is started is provided. May be provided in the casing.

Even with such a configuration, at least at the time of starting the pump, the pump is compressed in one of the pump working chambers (the pump working chamber on the side where the discharge port faces) partitioned by the movable vane, the rotor and the inner wall of the casing. Fluid or oil is efficiently transferred via the bypass to the other pumping chamber (the pumping chamber on the side facing the suction port) defined by the movable vane, the rotor and the inner wall of the casing. Therefore, resistance to rotation of the movable vane due to oil having a low temperature and high viscosity can be reduced, and the load on the rotor and the motor can be reduced.

[0028]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

As a first embodiment of the present invention, openings are provided in the first and second movable vanes 4a and 4b, and the openings are opened only when the pump is started, so that the load on the motor is reduced. The reduced rotary pump is shown in FIG.
The rotary pump of the present invention shown in FIG. 1 is the same as the conventional rotary pump except for the configuration and structure of the movable vane, and includes substantially the same elements as the conventional rotary pump described with reference to FIG. The same reference numerals are given and the description is omitted.

The movable vanes 4a and 4b are shown in FIG.
(B), (c) As shown in the drawing, the pump working chamber (having the discharge port 7 facing therethrough) has a hollow portion therein and is partitioned by the movable vanes 4a, 4b, the rotor 2 and the inner wall of the casing 1. Pump working chamber B) and movable vane 4
a, 4b and the inner wall of the rotor 2 and the inner wall of the casing 1, a plurality of openings 13, respectively, on the wall facing the other pumping chamber (the pumping chamber facing the suction port 6) A. 13 is constituted by a vane body 20.

In the inside hollow portion of the vane body 20, there is provided a flow hole 1 for opening the openings 13 provided in the walls of the vane body 20 facing the pumping chambers A and B, respectively.
An inner plate 10 having 4 and 14 is slidably fitted on the inner wall of the inner hollow portion of the vane body 20.

At one end of the internal hollow portion of the vane body 20, the inner plate 10 is attached to the other side of the internal hollow portion of the vane body 20 (in the direction of arrow 22 in FIGS. 1 and 2A). For example, an elastic body 12 such as a compression spring is provided.

On the other hand, at the other end of the internal hollow portion of the vane body 20, the inner plate 10 is attached to one side of the internal hollow portion of the vane body 20 (FIGS. 1 and 2) according to the rise in the temperature of the oil 8. (B)
An inner plate support 11 for moving in the direction of arrow 23) is provided to support the inner plate 10.

The inner plate support 11 has a plate shape formed by laminating metals having different coefficients of thermal expansion such as bimetals, for example, and is opposed to each other as shown in FIGS. 2 (a) and 2 (b). The ends may be supported at the ends of the internal hollow portion of the vane body 20, and may be provided in a state of being deformed in an arc shape toward the other side of the internal hollow portion of the vane body 20.

In the movable vane employed in the rotary pump of the present invention, the force of the elastic body 12 pressing the inner plate 10 in the direction indicated by the arrow 22 in the above-described configuration is applied when the rotary pump is started, that is, when the oil 8 When the temperature of the inner plate 10 is low, as shown in FIG. 2A, the flow holes 14, 14 of the inner plate 10 are related to the force with which the inner plate 10 is supported by the inner plate support 11 in the direction indicated by the arrow 23. Are adjusted so as to be arranged at positions where the openings 13, 13 provided on the walls of the vane body 20 facing the pump action chambers A, B can communicate with each other.

Therefore, even if the rotor 2 rotates in the direction indicated by the arrow 21 at least when the pump is started, the pump action chambers A and B
Are communicated through the openings 13 and 13 and the flow holes 14 and 14, through which oil 8 and fluid such as gas existing in the pump action chambers A and B can flow. And the movable vanes 4a, 4b when the pump is started.
And the load on the motor via the rotor 2 is reduced.

When the movable vanes 4a and 4b are rotated by operating the rotary pump, the movable vanes 4a and 4b
As shown in FIG. 1, since the tip portion is in contact with the inner wall of the casing 1, frictional heat is generated at the contact portion.
Further, since the movable vanes 4a and 4b move in the oil 8, frictional heat is also generated on the oil 8 and the surfaces of the movable vanes 4a and 4b. The temperature of the oil 8 rises due to this heat, and the temperatures of the movable vanes 4 a and 4 b and the rotor 2 also rise due to the heat transferred from the oil 8.

Inner plate support 1 arranged in movable vane 4
1 is made of, for example, a bimetal, as described above, and is deformed in an arc shape from the state shown in FIG. 2A to the state shown in FIG. 10 is moved in the direction of arrow 23. Then, the position of the flow hole 14 provided in the inner plate 10 is moved from the position shown in FIG. 2A to the position shown in FIG. The space between the openings 13, 13 provided in the walls facing the pump action chambers A, B is closed by the inner plate 10.

As a result, the pump working chambers A and B are separated from each other by the movable vanes 4a and 4b, the rotor 2 and the inner wall of the casing 1. As the rotor 2 rotates in the direction indicated by the arrow 21, fluid flows from the suction port 6 to the casing. 1, and the sucked fluid is discharged from the casing 1 through the outlet 7, that is, out of the rotary pump.

As described above, with the rotation of the movable vanes 4a, 4b at the time of startup, the temperature of the oil 8 rises,
Further, the temperatures of the movable vanes 4a, 4b and the rotor 2 also rise due to the heat transferred from the oil 8, so that the inner plate 10 moves under the force of the inner plate support 11, and the pump action chambers A and B
Is cut off through the openings 13, 13 and the flow holes 14, 14 to thereby start suction and discharge of the fluid by the rotary pump. Therefore, the time required to start up the pump can be reduced without the need to separately provide a means for heating the oil 8 in order to reduce the load on the pump.

Next, as a second embodiment of the present invention,
A rotary pump with a bypass is shown in FIG. 3 and described. The rotary pump according to the second embodiment of the present invention shown in FIG. 3 is the same as the conventional rotary pump except that the rotary pump is provided with a bypass 15.
Elements that are substantially the same as those of the conventional rotary pump described with reference to FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.

In the embodiment shown in FIG. 3, the pump action chamber A (the pump action chamber on the side facing the suction port 6)
A bypass 15 having open ends near the discharge port 7 and the suction port 6 of the casing 1 so as to communicate with the pump operation chamber B (the pump operation chamber on the side where the discharge port 7 faces).
Is provided in the casing 1.

As the movable vanes 4a and 4b rotate in the direction of the arrow 21, the volume of the pump working chamber B formed on the discharge port 7 side decreases, and the fluid and oil 8 therein are compressed. Will be.

Here, the bypass 15 is provided with a valve 16, and the valve 16 is opened at least when the pump is started. So, as mentioned above,
When the volume of the pumping chamber B decreases and the fluid and the oil 8 therein are compressed, the compressed fluid and the oil 8 are transferred to the pumping chamber A through the bypass 15.

Therefore, when the pump is started, the amount of the compressed gas and the oil 8 in the pump working chamber B formed on the discharge port 7 side is reduced, so that the movable vanes 4a and 4b, and hence the rotor 2, The resistance applied to the motor that applies a rotational force to the motor can be reduced.

With the rotation of the movable vanes 4a, 4b, frictional heat is generated between the inner wall of the casing 1 and the tips of the movable vanes 4a, 4b, or with the compression of the pump action chamber B defined on the discharge port 7 side. Heat of compression is generated. The oil 8 is warmed by these heats. If the temperature of the oil 8 increases, the viscosity of the oil 8 also decreases, so that the pump can be brought into a steady operation state with the load applied to the motor via the movable vanes 4a, 4b and the rotor 2 reduced.

However, if the fluid or oil 8 is transferred from the pump working chamber B to the pump working chamber A through the bypass 15 during a steady operation, the performance of the pump to discharge is significantly reduced. To prevent this, bypass 1
The valve 16 provided in the valve 5 needs to be configured to be closed when a steady operation is performed and the respective pump working chambers A and B are separated.

Therefore, the valve 16 is connected to a sensor for sensing the temperature of the oil 8 or the casing 1, and when the temperature of the oil 8 or the casing 1 reaches a predetermined temperature, it is considered that the pump is in a steady operation, and is automatically operated. It is preferable to configure so as to be closed. Further, the valve 16 may be provided with a timer so that the steady operation is determined based on the lapse of time from the start of the pump.

The preferred embodiment of the present invention has been described with reference to the accompanying drawings. However, the configuration and structure of the rotary pump are only schematically shown to the extent that the present invention can be understood. The present invention is not limited to the above-described embodiment, and can be changed to various modes within the technical scope understood from the description of the claims.

For example, the compression spring 12 has been employed as the elastic body which constantly urges the inner plate 10 in the direction of the arrow 22. However, if the elastic body performs the same function and function, it may be a rubber material. Various elastic bodies can be adopted.

As the inner plate support 11 for moving the inner plate 10 in the direction of arrow 23 in response to a rise in temperature, a plate-like body formed by laminating metals having different coefficients of thermal expansion such as bimetals is used. Although adopted, other things can be adopted as long as they perform the same function and function.

Further, in the second embodiment of the present invention,
Openings at both ends of the bypass 15 are used to realize more efficient transfer of the fluid or oil 8 accompanying the compression in the pump action chamber B from the pump action chamber B to the pump action chamber A.
It is desirable to be connected to the vicinity of the discharge port 7 and the vicinity of the suction port 6 respectively. However, the position where the both ends of the bypass 15 are connected to the vicinity of the discharge port 7 and the vicinity of the suction port 6 of the casing 1 is As long as the transfer of the compressed gas or oil 8 from the inside of the pump working chamber B formed on the discharge port 7 side to the other pump working chamber A at the time of starting the pump can be realized efficiently, FIG. The position is not limited to the position shown in FIG.

[0053]

As described above, according to the rotary pump of the present invention, at least when the pump is started, the pump working chamber on one side defined by the movable vane, the rotor and the inner wall of the casing is moved from the pump working chamber on the other side. The fluid (gas, liquid, viscous liquid) existing in the pump working chamber or the oil filled in the caging is transferred to the pump working chamber of the pump working chamber without using a heating means. The resistance applied to the movable vane at the time of startup can be reduced, and accordingly, the load on the movable vane, the rotor, and the motor can be reduced to prevent breakage and the like. Also,
The pump can be started without activating the safety mechanism provided in the motor.

Furthermore, by using the heat generated by the rotation of the movable vane as a heating source for the oil, the oil can be warmed without having a separate heating means, and when the oil temperature rises, the movable vane has already been heated. The rotation speed is high, and a steady operation can be performed immediately. That is, the startup time of the pump can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a rotary pump according to the present invention.

FIG. 2 is a view for explaining a schematic configuration of a movable vane employed in the rotary pump of the present invention shown in FIG. 1;
(A) Sectional drawing explaining the state of the movable vane at the time of starting a pump. (B) Sectional drawing explaining the state of the movable vane at the time of steady operation. (C) The top view explaining the opening part of a vane body.

FIG. 3 is a diagram illustrating a schematic configuration of another rotary pump according to the present invention.

FIG. 4 is a diagram illustrating a schematic configuration of a conventional rotary pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Rotor 3 Storage groove 4a, 4b Movable vane 5 Spring 6 Inlet 7 Outlet 8 Oil 10 Inner plate 11 Inner plate support 12 Elastic body 13 Opening 14 Flow hole 20 Vane body

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H029 AA05 AA15 AA21 BB12 CC04 CC06 CC25 CC46 CC54 CC85 3H040 AA01 AA05 AA07 BB04 BB05 BB14 CC13 DD08 DD12 3H044 AA01 AA02 AA04 BB05 CC10 DD14

Claims (4)

[Claims] 1. A rotor having a movable vane is rotatably mounted inside a casing having an inlet and an outlet.
A rotary pump, in which one end of the movable vane rotates while abutting on the inner wall of the casing in accordance with the rotation of the rotor to suck fluid into the casing from the suction port and discharge the sucked fluid from the discharge port, One pump action chamber defined by the movable vane, the rotor, and the inner wall of the casing, and the other pump action chamber defined by the movable vane, the rotor, and the inner wall of the casing, communicate with each other at least when the pump is started. A rotary pump characterized by being enabled. 2. A movable vane having a hollow portion inside, and a vane body having an opening in a wall facing the one pump working chamber and the other pump working chamber, respectively, and a hollow inside the vane body. The opening is slidably fitted in the inner wall of the internal hollow portion inside the portion, and connects the openings provided on the wall facing the one pump action chamber and the other pump action chamber of the vane body. An inner plate having a flow hole; and an elastic member provided at one end of the inner hollow portion of the vane body for urging the inner plate toward the other side of the inner hollow portion of the vane body. Body, provided at the other side end of the internal hollow portion of the vane body, supports the inner plate, and in accordance with a rise in temperature, the inner plate is provided on the one side of the vane internal hollow portion. It consists of an inner plate support that moves toward At the time of starting the rotary pump, the flow holes of the inner plate are arranged at positions where the openings provided on the wall facing one pump action chamber and the other pump action chamber of the vane body can communicate with each other. 2. The rotary pump according to claim 1, wherein the forces applied to the inner plate from the elastic body and the inner plate support are adjusted so that the elastic body and the inner plate supporter respectively. 3. The inner plate support for supporting the inner plate is a plate formed by laminating metals having different coefficients of thermal expansion,
Opposite ends of the vane body hollow portion are supported by the other end of the vane body hollow portion, and the other end of the vane body hollow portion is deformed in an arc shape toward the one side of the vane body hollow portion. 3. The rotary pump according to claim 2, wherein the rotary pump is provided at an end of the rotary pump. 4. The casing is provided with a bypass having an open end near a discharge port and a suction port of the casing and having a valve that is open at least when the pump is started. The rotary pump according to 1.