JPH05974U - Pump drive - Google Patents

Abstract

(57) [Abstract] [Purpose] A rotary shaft of a pump is not overloaded, has high transmission efficiency, and is compact. [Structure] The casing 2 is hermetically sealed by a casing 2 joined to the pump 1 and a lid member 3 joined to an end of the casing 2, and a coil 4 is attached to an inner wall of the casing 2.
Is installed, and the casing is approximately the same as the axis of the coil 4.
A support shaft 7 fixed to 2 is provided, a rotor 5 having a magnet 6 attached thereto is rotatably supported on the support shaft 7, and the power of the rotor 5 is transmitted between the rotor 5 and the rotary shaft 1a of the pump 1 described above. A flexible coupling 10 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive device for a pump that pumps a liquid such as a CFC liquid or an ammonia liquid, which is less likely to leak to the outside, and more specifically to a pump drive device that does not leak liquid at all.

[0002]

[Prior Art]

 Conventionally, a pump drive device for pumping a liquid such as a CFC liquid or an ammonia liquid which is difficult to leak to the outside has a mechanism for transmitting the power of the drive motor 52 to the pump 51 as shown in the sectional view of FIG. A magnetic coupling 53 is generally used to prevent liquid from leaking to the outside.

The structure of the magnet coupling 53 on the pump 51 side is such that the rotor 54 has a circular magnet 55 attached to the end of the rotary shaft 51a of the pump 51 in which the periphery of the rotary shaft 51a is sealed by a sealing material 56. It was attached. However, the seal of the seal material 56 is not perfect, and the liquid inside the pump 51 will leak from the seal portion with the passage of time.

Therefore, by covering the magnet 55 with a thin casing 57 made of a non-magnetic material and sealing the casing 57 and the pump 51 with a sealant 59, even if liquid leaks from the seal portion of the rotary shaft 51a. The liquid is prevented from leaking to the outside by allowing only the casing 57 to leak.

For the transmission of power, a driving magnet 58, which is larger than the casing 57, is provided outside the casing 57, and the driving motor 58 is rotated by the driving motor 52 so that the rotation shaft 51a of the pump 51 is rotated. A rotating magnetic field is applied to the attached magnet 55 to rotate the rotating shaft 51a.

As a conventional technique of this type, there is a device described in Japanese Utility Model Laid-Open No. 1-58794.

[0007]

[Problems to be solved by the device]

 However, in the above-mentioned magnetic coupling, since the magnet, which is a heavy object, and the rotor are attached to the rotating shaft of the pump in a cantilevered state, an extra load is constantly applied to the bearing of the rotating shaft due to its weight, and The rotating shaft bearing is easily worn and may cause early damage.

Further, since the magnet coupling itself makes it impossible to transmit 100% of the torque, the drive motor becomes large in size when the loss of the transmitted torque is taken into consideration.

Furthermore, since a space for providing a large magnet coupling is required between the drive motor and the pump, the size of the entire device becomes large.

Therefore, in order to improve the torque transmission efficiency and downsize the device, a coil is directly wound on the outside of the casing, and the direction of the current flowing through the coil is directly changed to impart a rotating magnetic field to the coil. Although a method of directly rotating the magnet by using a magnet has been proposed, it has not been realized yet. Moreover, even this method cannot solve all the problems described above.

In view of the above problems, it is an object of the present invention to provide a compact pump drive device that does not impose an extra load on the rotary shaft of a pump, has high transmission efficiency, and is compact.

[0012]

[Means for Solving the Problems]

 In order to achieve the above object, a pump drive device according to the present invention seals the inside of the casing with a casing joined to the pump and a lid member joined to an end of the casing, and a coil is provided on an inner wall of the casing. A support shaft fixed in the above casing is provided substantially the same as the axis of the coil, and a rotor having a magnet attached to the support shaft is rotatably supported, and a rotor is provided between the rotor and the rotation shaft of the pump. It is characterized in that a transmission means for transmitting the power of is provided.

[0013]

[Action]

 With the above structure, a rotating magnetic field is applied to the coil provided on the inner wall of the casing, so that the rotor provided substantially in the same axis as the coil rotates together with the magnet. Then, the rotational force of the rotor is transmitted to the rotary shaft of the pump by the transmission means.

Since the magnet is supported by the support shaft fixedly supported in the casing via the rotor, the load of the magnet weight is not applied to the rotating shaft of the pump, and only the rotating force is applied to the rotating shaft of the pump. . In addition, since the coil, rotor, and rotor support shaft are provided inside the casing, the entire device becomes compact.

[0015]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. It should be noted that in the following description, a pump that pumps the fluorine liquid is used as an example.

FIG. 1 is a front view of a cross-sectional view of a pump driving device of the present invention. As shown in the drawing, one end of a casing 2 is joined to a rotary shaft 1a side of a pump 1 by a bolt 13, and this casing is On the other end side of 2, the coil 4 provided inside the casing 2 described later.
And a lid member 3 having a connector 3a for inputting / outputting electric current to / from the magnetic sensor 11 is bolted.
It is joined by 13. Then, the casing 2 and the pump 1 and the lid member 3 are completely sealed by providing a sealing material 2a. A is the discharge side from pump 1, and B is the suction side.

A coil 4 is attached around the inner wall of the casing 2 thus sealed, and a flange portion 2b is provided so as to project from the inside of the casing 2, and a support shaft having a base portion 7a on the flange portion 2b. 7 is attached with bolt 7b.

A magnet 6 is attached to the periphery of the support shaft 7, and a rotor 5 having an insertion hole 5a in the center is inserted into the support shaft 7, and a washer 8 is fixed to the tip of the support shaft 7 with a bolt 9. In this way, the rotor 5 is rotatably supported on the support shaft 7 fixed to the casing 2 so as to be rotatable.

Further, a pair of locking portions 5b is formed at the end of the rotor 5 on the pump 1 side by notching the rotor 5, and the pin 1b provided on the rotary shaft 1a of the pump 1 is fixed to this locking portion. A so-called flexible coupling 10 [transmission means (universal joint or the like)] is provided which connects the rotor 5 and the rotary shaft 1a by engaging with 5b.

On the other hand, inside the coil 4 attached to the inner wall of the casing 2, a magnetic sensor 11 for detecting the magnetic direction of the magnet 6 attached to the rotor 5 is provided. Reference numeral 12 is a pipe for returning the CFC liquid accumulated in the casing 2 to a tank (not shown).

When operating the pump driving device configured as described above, a connector (not shown) from a power source is connected to the connector 3a of the lid member 3, and the S pole and N pole of the magnet 6 attached to the periphery of the rotor 5 are connected. The magnetic sensor 11 detects the magnetic direction and the direction of the current flowing through the coil 4 is controlled by an amplifier (not shown), and a current is passed through the coil 4 to give a rotating magnetic field to the coil 4 to rotate the rotor 5. When the pump 1 is driven by transmitting the rotational force of the rotor 5 to the rotary shaft 1a of the pump 1 via the flexible coupling 10, the pump 1 sucks the CFC liquid from the suction side B and discharges it from the discharge side A. And pump the fluorinated liquid.

By the way, if the CFC liquid leaks from the rotating shaft 1a of the pump 1 while the CFC liquid is being pumped, the inside of the casing 2 is completely sealed and the CFC liquid will not leak to the outside. Instead, it is returned to the tank (not shown) through the pipe 12.

Further, in the above-described embodiment, the motor unit can be cooled by the CFC liquid leaking from the rotary shaft 1a of the pump 1, and the coil 4 is always under the CFC liquid and is not exposed to the outside air. It can also be used in harsh environments.

Further, as described above, the pump drive device according to the present invention significantly reduces the load on the bearing of the pump, so that the life of the bearing is extended and the drive motor unit can be made extremely compact. It is particularly useful when used in a pump that pumps CFC liquid in a refrigeration system used in a limited space, such as space problems and maintenance problems, at the same time.

In the above embodiment, the rotor 5 and the rotating shaft 1a of the pump 1 are connected by the flexible coupling 10 using the engaging portion 5b formed by cutting out the end of the rotor 5 and the pin 1b. However, the means is not particularly limited as long as it can transmit the rotation of the rotor 5 to the rotation shaft 1a.

[0026]

[Effect of the device]

 According to the present invention, since the rotor and the magnet are separated from the rotary shaft of the pump, the load on the rotary shaft bearing can be extremely reduced, so that the adverse effect on the bearing can be extremely reduced and the life of the pump drive device can be extended. be able to.

Further, since the coil, the rotor, and the supporting shaft for the rotor are provided inside the casing, and the rotor is directly driven by the coil, the motor section can be made small and the efficiency is improved, and the entire apparatus is very efficient. It becomes compact.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the entire pump driving device of the present invention.

FIG. 2 is a cross-sectional view showing an entire conventional pump drive device.

[Description of symbols] 1 ... Pump 1a ... Rotating shaft 1b ... Pin 2 ... Casing 3 ... Lid member 4 ... Coil 5 ... Rotor 5a ... Insert hole 5b ... Locking part 6 ... Magnet 7 ... Support shaft 8 ... Washer 9 ... Bolt 10 ... Flexible coupling (Transmission means) 11 ... Magnetic sensor

Claims (1)

[Claims for utility model registration] 1. A casing joined to a pump and a lid member joined to an end of the casing seals the inside of the casing, and a coil is provided on an inner wall of the casing. A support shaft fixed in the casing is provided substantially the same as the shaft center, a rotor having a magnet attached to the support shaft is rotatably supported, and the power of the rotor is transmitted between the rotor and the rotation shaft of the pump. A pump drive device comprising a transmission means.