JPH068788U - Oil rotary vacuum pump - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the overall axial length of the pump and reduce costs. [Structure] The Oldham coupling 14 is housed in the pump body A,
The ridge 15 of the motor shaft 15 inserted into the pump body A in the groove 14a provided on one end surface of the Oldham coupling 14.
In addition to engaging a, the ridge 14b provided on the other end surface of the Oldham coupling 14 was engaged with the flat plate-shaped sliding groove 4a opening at one end surface of the rotor 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil rotary vacuum pump used in various fields of hydraulic equipment.

[0002]

[Prior art]

As shown in FIG. 6, a conventional general oil rotary vacuum pump has a blade plate (not shown) fitted in a flat plate-shaped sliding groove b provided in a rotor a so as to be capable of projecting and retracting. A pump main body d having its tip slidably contacting the inner surface of the stator c and surrounding the pump chamber p by these rotor a, vanes and stator c, and a motor m connected to this pump main body d. It is equipped with A well-known pump action can be performed by rotationally driving the rotor a from the motor m via the shafts s ₁ and s ₂ .

[0003]

[Problems to be solved by the device]

However, in such a conventional oil rotary vacuum pump, the shaft s ₂ extending from the pump body d and the shaft s ₁ extending from the motor m are connected to a general coupling such as a flange coupling or a chain coupling. It is customary to connect the pump main body d and the motor m outside through e. For this reason, there is a gap L between the pump main body d and the motor m, and it is difficult to fill the gap L to a certain size or more, which leads to an increase in the axial length of the entire pump. . Further, when the pump main body d and the motor m are separately arranged in this way, it is necessary to attach an adapter (not shown) between the two in order to integrally connect them, which leads to a high cost. There is a drawback that.

On the other hand, it may be considered that the shaft s _{1 of the} motor m is directly inserted into the pump body d and directly connected to the shaft s ₂ of the rotor a by a set pin or the like. When there is a center deviation between the shafts s ₁ and s ₂ , unreasonable stress is likely to act on each part, resulting in a disadvantage that pump performance is significantly reduced. Further, even when there is no center deviation, the same inconvenience as described above occurs when the shaft s ₂ itself is vibrating.

The present invention has been made in view of such a problem, and is an oil rotation system capable of effectively reducing the size and cost of the entire pump without lowering the pump performance. The purpose is to provide a vacuum pump.

[0006]

[Means for Solving the Problems]

 The present invention adopts the following configuration in order to achieve such an object.

That is, in the oil rotary vacuum pump according to the present invention, the vane is fitted into the sliding groove provided in the rotor so that the vane is slidably contacted with the inner surface of the stator. And a pump main body in which a pump chamber is surrounded by the rotor, the vanes, and the stator, and a motor connected to the pump main body. The motor drives the rotor to rotate. In this configuration, the gas introduced from the intake port into the pump chamber can be exhausted toward the exhaust port, and the Oldham coupling is housed in the pump main body, and the Oldham coupling is provided on the end face on the motor side. The ridge or groove is engaged with the groove or ridge provided on the shaft end of the motor shaft, and the ridge provided on the pump body side end surface of the Oldham coupling is attached to the motor side end surface of the rotor. Engaging with the sliding groove that opens It is characterized by being combined.

[0008]

[Action]

 With this structure, when the shaft of the motor is introduced into the pump body and the shaft end of the shaft is engaged with the sliding groove of the rotor through the Oldham coupling, the motor is driven to the pump body. As a result, it is possible to eliminate or shorten the gap that has been conventionally present between the pump body and the motor. However, due to the presence of the Oldham's joint, the center shift between the motor shaft and the rotor, the vibration of the rotor, and the like can be absorbed appropriately.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

This oil rotary vacuum pump is called a Goethe type, and as shown in FIG. 1 and FIG. 2, it is immersed in the reserve oil 2 stored inside the casing 1 to dispose the stator 3 therein. The rotor 4 is housed in the stator 3 in an inscribed state. The rotor 4 is supported by the front cover 6 and the rear cover 7 via shafts 5a and 5b integrally fixed to one end surface and the other end surface of the rotor 4, and has a flat plate-shaped sliding groove provided within the wall thickness. 4a has a pair of blades 9 and 9 retractably housed in the spring 4a via a spring 8, and when the rotor 4 is rotationally driven, these blades 9 and 9 are slid on the inner peripheral surface of the stator 3. While being in contact with each other, the partition volume of the pump chamber P formed between the stator 3, the rotor 4, and the vane 9 can be continuously changed. The intake port 10 is opened in the space where the volume gradually increases, and the exhaust port 11 is opened in the space where the volume gradually decreases. The gas sucked from the intake port 10 is exhausted through the exhaust port 11. It is possible to carry out the well-known pumping action of exhausting compressed air from. The sliding groove 4a is made as follows. That is, as shown in FIGS. 3 and 4, first, the rotor 4 and the shaft 5b are cut into halves, and then the connecting rod 12 is inserted into the shaft 5b so that the gap between the upper and lower rotors 3 is divided. The shaft 5b and the connecting rod 12 are welded closely to each other, and then the ring member 13 is fitted on the outer periphery of the shaft 5b so that the upper and lower rotors 3 in the half split state. The sliding groove 4a is formed.

With this configuration, in this embodiment, when the sliding groove 4a is processed, the shaft holes 5c and 4b are formed in the shaft 5a and the rotor 5 and the shaft 5a is formed at the bottom of the shaft 5a. The sliding groove 4a of the rotor 4 is opened. Then, as shown in FIG. 5, the Oldham coupling 14 is first inserted from the tip of the shaft 5a, and then the shaft 15 of the motor M is inserted. In the Oldham coupling 14, a groove 14a is previously formed on the end surface on the motor M side, and a ridge 14b orthogonal to the groove 14a is formed on the end surface on the side opposite to the motor M. Then, the protrusion 14b is engaged with the sliding groove 4a of the rotor 4 and the groove 14a is engaged with the protrusion 15a of the shaft 15, and in that state, as shown in FIG. The flange 16 is brought into direct contact with the front end surface 6a of the front cover 6 of the pump body A, and the flange 16 and the front cover 6 are connected at a position not shown.

With the above structure, the gap L between the pump body A and the motor M, which is conventionally present, as shown in FIG. 6 does not exist, and as a result, the shaft of the entire pump is In addition to shortening the direction, it is possible to reduce costs by eliminating the use of adapters. Moreover, since the Oldham coupling 14 is interposed, the center deviation between the motor shaft 15 and the rotor 4 and the vibration of the rotor 4 are absorbed, so that it is possible to effectively prevent the deterioration of the pump performance.

Although the Oldham coupling 14 is completely housed in the hole 4b of the rotor 4 in the above-described embodiment, the Oldham coupling 14 itself is arranged outside the rotor 4, Only the protrusion 14b may be engaged with the sliding groove 4a.

[0014]

[Effect of device]

 Since the oil rotary vacuum pump of the present invention has the configuration described above, the motor is attached to the pump body, the shaft end of the motor shaft is introduced into the pump body, and the shaft is attached to the Oldham coupling. Can be connected to the rotor via. Therefore, it is possible to eliminate the gap between the pump and the conventional pump that existed between the pump body and the motor without degrading the pump performance.As a result, the overall length of the pump can be shortened in the axial direction. Costs can be reduced by eliminating the use of adapters.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged cross-sectional view of the rotor taken along line III-III in FIG.

FIG. 4 is a view on arrow IV in FIG.

FIG. 5 is an assembled perspective view of the embodiment.

FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 A ... Pump main body M ... Motor P ... Pump chamber 3 ... Stator 4 ... Rotor 4a ... Sliding groove 9 ... Vane 10 ... Intake port 11 ... Exhaust port 14 ... Oldham coupling 14a ... Groove 14b ... Projection 15 ... Shaft 15a ... ridge

Claims (1)

[Scope of utility model registration request] 1. A vane is slidably fitted in a sliding groove provided in a rotor, and a tip of the vane is slidably contacted with an inner surface of a stator,
It comprises a pump main body surrounding a pump chamber by these rotors, vanes, and a stator, and a motor connected to this pump main body. In an oil rotary vacuum pump capable of exhausting gas introduced into the pump chamber from an outlet toward an exhaust port, an Oldham coupling is housed in the pump body, and a protrusion provided on an end surface of the Oldham coupling on the motor side. The ridge or groove is engaged with the groove or ridge provided on the shaft end of the shaft of the motor, and the ridge provided on the end face of the Oldham coupling on the pump body side is opened on the end face of the rotor on the motor side. An oil rotary vacuum pump characterized by being engaged with the sliding groove.