JPS62159786A - Rotary vane type pump - Google Patents

Abstract

PURPOSE:To prevent noises from being produced as well as to prevent sweat from being produced in a pump actuation chamber due to rapid changes in the ambient temperature by surrounding the pump actuation chamber constituted with a center case inner circumference and a side plate end surfaces by means of a tight-sealing vacant chamber. CONSTITUTION:Inside a center case 2 of a vane type pump is formed a center case tight-sealing chamber 8 surrounding a vacant chamber 13 serving as an actuation chamber. Similarly, on a side plate 1 of the center case is formed a side plate tight-sealing chamber 10. Since these tight-sealing chambers 8 and 10 serve as insulators against noises as well as heat, sweat in the actuation chamber due to rapid changes in the ambient temperature is prevented from being produced and also noises produced within the actuation chamber are prevented from being transmitted outside.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Commercial Use] The present invention relates to a rotary vane pump, and particularly to an oil-free rotary vane pump.

[Conventional technology]

Conventionally, as known from, for example, Japanese Utility Model Application Publication No. 59-27185, a rotary vane pump has a rotor that rotates within a space surrounded by a center case and a side plate, and the vanes held in grooves provided in the rotor. , the volume of the space surrounded by the center case, rotor, and side plates changes to perform the pumping action.

Furthermore, measures against noise caused by exhaust noise are already known, for example, as disclosed in Japanese Utility Model Publication No. 54-32241.

[Problem that the invention seeks to solve]

However, with the above conventional technology, noise countermeasures are still insufficient, and with the above conventional technology, when the ambient temperature of the pump suddenly changes from high to low temperature, the noise generated by the pump is surrounded by the inner peripheral surface of the center case and the end surface of the side plate. However, no consideration has been given to the fact that the gas remaining in the pump action chamber may condense, leading to the problem of rust forming inside the pump action chamber, which is particularly important in non-supplied pumps. there were.

The purpose of the present invention has been made based on the above-mentioned drawbacks of the prior art, and specifically, the purpose of the present invention is to prevent the occurrence of rust due to condensation of gas in the pump action chamber due to sudden changes in ambient temperature. Another object of the present invention is to provide a rotary vane pump that is also effective in reducing noise caused by pump operation.

[Means for solving problems]

The above objects of the present invention have been achieved by surrounding the pumping chamber surrounded by the center case and side plates of the rotary vane pump with a sealed cavity.

[Effect]

The sealed cavity around the pumping chamber has the effect of slowing down the heat transfer from the surroundings to the pumping chamber. As a result, even if the ambient temperature of the pump suddenly changes from high to low, the air remaining in the pump action chamber, which is surrounded by the inner peripheral surface of the center case and the side plate, will not condense. Prevents rust from forming inside the pump action chamber.

At the same time, the sealed chamber also has the function of preventing noise generated by the pump action from leaking outside.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

A rotor 3 is provided in a cylindrical center case 2 whose both ends are closed with side plates la and lb. It is rotatably supported by provided bearings 5a and 5b. Further, the rotor shaft 4 is connected to the electric motor 1, for example.
It is connected to the output shaft 4' of a rotating machine such as No. 4 through an Oldham joint, and is rotated by the rotational torque of this rotating machine. A connector cover 15 is provided at the joint between the rotor shaft 4 and the output shaft 4', and its structure, effects, etc. will be described in detail later.

A vane 7 is held in a rotor groove 6 provided in the rotor 3 so as to be slidable in the radial direction. When the rotor 3 rotates, the vane 7 comes into contact with the inner peripheral surface of the center case 2 due to centrifugal force.

A moat-like or penetrating groove is provided on both end surfaces of the center case 2, and the center case 2 and the side plates la,
lb is attached, the groove portion constitutes the center case sealed chamber 8.

Further, a moat-like groove is also provided on the outer end surfaces of the side plates la, lb.
When the lid members 9a, 9b are attached to the side plate b, the groove portions constitute side plate sealed chambers 10a, 10b.

A suction hole 11 communicating with the outside and a discharge hole 12 communicating with the center case sealed chamber 8 are opened at appropriate positions on the inner peripheral surface of the center case 2.

The inner surface shape of the center case 2 is such that the volume of the space 13 formed by the vanes 7, the side plates la, lb, and the rotor 3 is large near the suction hole 11, and the volume of the space 13 formed by the vane 7, the side plates la, lb, and the rotor 3 is large near the suction hole
It is set to become smaller in the vicinity. Therefore, when the rotor 3 is rotated by the pump driving electric motor 14, air is sucked in through the suction hole 11 and discharged from the discharge hole 12, thereby performing a pumping action.

Therefore, according to this embodiment, the empty chambers surrounded by the inner circumferential surface of the center case and the side plates where the pumping action is performed are the center case sealed chamber 8 and the side plate sealed chamber 10a.
, 10b, even if the ambient temperature of the pump suddenly changes from high to low, the center case sealed chamber 8 and the side plate sealed chamber 10a.

10b functions to slow down heat propagation, so moisture in the air remaining in the space 13 does not condense on the inner peripheral surface of the center case, the end surface of the side plate, the outer peripheral surface of the rotor, the vane surface, etc. This is effective in preventing rust on the inner circumferential surface of the center case, the end surfaces of the side plates, etc.

Further, in this embodiment, even if water infiltrates through the gap between the center case and the side plate, the water remains in the center case sealed chamber 8 and does not intrude into the pump action chamber.

In this embodiment, a structure is adopted in which the gas discharged from the discharge hole 12 of the pump is guided to the outside from the discharge hole 15 via the sealed chamber 8 of the center case. However, it is difficult to realize the present invention. is not limited to the above-mentioned structure, and may have a structure in which the discharge hole 12 is directly communicated with the discharge hole 15 by a pipe, for example.

However, in the above embodiment, the compressed air is discharged to the outside through the sealed chamber 8 of the center case, so the discharge hole 12
It also has the effect of being able to eliminate fluid noise that occurs when air is discharged from the pipe.

Next, in FIG. 1, a connector cover 1 covers the Oldham joint between the output shaft 4' of the electric motor 14 and the rotor shaft 4.
6 will be explained. The connector 16 is made of an elastic body such as rubber, and as shown in FIGS. 4 and 5, the cylindrical portion 16
a and a cylindrical portion 16b with a protrusion 17. The cylindrical portion 16a is fitted onto one shaft (the rotor shaft 4 in FIG. 1) with a tight fit, and the connector 16 is fixed to the rotor shaft 4. The protrusion-equipped cylindrical portion side 1-6b is connected to the other shaft (the first
As shown in FIG. 3, a protrusion 17 is elastically deformed on the motor shaft 4' (as shown in FIG. 3), so that it comes into close contact with the shaft 4' or 4.

The connector cover 16 made of the elastic body is tightly fitted to one of the rotating shafts, and the elastic body is fixed to one of the rotating shafts, and the elastic body is fixed to the other rotating shaft.

By elastically deforming the plurality of protrusions 17 provided on the inner diameter of the elastic body and tightly fitting them to the shaft, relative movement of both shafts is buffered and noise generation at the joint is suppressed. In addition, since the structure utilizes the elastic deformation of the protrusion to make it stick tightly to the shaft, it is easy to assemble by inserting the shaft, and the change in the holding force of the shaft due to aging of the elastic body can be minimized, ensuring quietness for a long time. can.

With this configuration, in terms of assembly accuracy of the two shafts, even if the play in the Oldham joint is large, impact contact due to the relative movement of the rotor shaft 4 of the pump and the motor shaft 14, which rotate repeatedly with torque changes as described above, can occur. The sound is reduced because the collision speed is slowed down by the elastic force of the protrusion 17 of the connector cover 16, and it is possible to reduce noise and prevent wear and tear on the connecting shaft.

Furthermore, the elastic force of the protrusion 17 of the connector cover 16 is used to reduce the wear life of the shaft and the connector 15.

Since it is in close contact with the shaft, there is no excessive contact load, which can extend the life of the shaft, and it also has the effect of improving the ease of assembly when inserting the shaft.

〔Effect of the invention〕

According to the present invention, as is clear from the above, even if the ambient temperature of the pump suddenly changes from high to low, the moisture in the air remaining in the pump action chamber does not condense, so the pump It is possible to obtain a rotary vane type pump which is not effective in preventing rust in the working chamber but has an excellent rust-preventing effect, and at the same time has an excellent noise-preventing effect.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of one embodiment of the rotary vane pump according to the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a shaft coupling portion and connector cover of Fig. 1. 4 is a central sectional view of the connector cover shown in FIG. 3, and FIG. 5 is a sectional view taken along line B--B. 1...Side plate, 2...Sensor case, 3.
... Rotor, 4... Rotor shaft, 4'... Rotating machine output shaft, 5... Bearing, 6... Rotor groove, 7... Vane, 8... Center case sealed chamber, 9a , 9b... Lid member, 10... Side plate sealed chamber, 11... Suction hole, 12... Discharge hole, 13... Empty chamber, 14... Electric motor, 15... Discharge hole , 16... Connector cover.

Claims (5)

[Claims] 1. It has a center case, a rotor that rotates within the center case by rotational torque from a rotating machine, a vane movably held in a groove provided in the rotor, and a side plate in contact with an opening end surface of the center case. In a rotary vane pump, the volume of the space surrounded by the center case, the rotor, the vanes, and the side plate changes as the rotor rotates to perform a pumping action. A rotary vane pump characterized by a pump action chamber formed by the end face of a side plate, surrounded almost entirely by a sealed cavity. 2. In the rotary vane pump according to claim 1, a moat-like or penetrating groove is provided almost all around the thick wall between the inner and outer peripheries of the center case. A rotary vane pump characterized in that when a side plate is attached, the groove portion constitutes the sealed chamber. 3. In the rotary vane pump according to claim 1, a lid member is provided on a surface of the side plate opposite to the pump action chamber, and a sealed chamber is formed between the side plate and the cover. A rotary vane pump characterized by: 4. The rotary vane type pump according to claim 3, wherein the lid member and the bracket of the rotating machine for driving the rotary vane are integrated. 5. In the rotary vane type pump according to claim 4, the rotor has a rotor rotation shaft, and the rotor rotation shaft is coupled to the rotation output shaft of the rotary vane driving rotary machine by an Oldham coupling. A rotary vane pump characterized in that the connecting portion is covered with a connector cover made of an elastic material.