JPS58176908A - Forced oil type transformer for vehicle - Google Patents

Abstract

PURPOSE:To omit the operation required for remodeling wiring and devices other than a transformer and provide a switching function with an extremely simple construction, by providing a means for giving an alarm when detecting a stop of oil flow thereby to protect the transformer. CONSTITUTION:When a vehicle is traveling in an AC section and an oil feeding pump is operative to allow the oil to flow normally, a reed switch 1 is open, while a reed switch 2 is closed, so that the protection circuit is open as viewed from terminals (a), (b). On the other hand, when the pump suspends to shut off the oil flow, the reed switch 1 is closed, and also the reed switch 2 is closed, so that the protection circuit is closed. When the vehicle is traveling in a DC section and the transformer is inoperative and in addition the pump suspends, the reed switch 1 is closed, while the reed switch 2 is opened, so that the protection circuit is opened. Accordingly, only in the case of (B), the protection circuit is closed to give an alarm, and the abnormal operation can be discriminated from the normal operations (A), (C). It is to be noted that when the transformer is operated to allow the load current to flow, a magnetic field M is produced around conductors, i.e., a terminal 11 and an external lead 12 thereby to make it possible to close the reed switch 2 disposed in the vicinity of the conductors.

Description

[Detailed Description of the Invention] The present invention relates to an oil feed type transformer for a vehicle.
To be more specific, it is mounted on an AC/DC electric vehicle and is equipped with a means to protect the transformer by detecting the stoppage of oil flow and issuing an alarm if the oil flow stops while the transformer is in operation. This relates to oil-fed transformers.

Conventionally, some transformers of this type have not been provided with an opening/closing means for opening/closing the alarm circuit in the oil flow indicator due to improved reliability of the oil supply bomb. However, even if there is no abnormality in the function of the oil pump itself,
If the power supply to the oil pump stops due to external factors such as damage to the equipment that supplies power to the oil pump, or breakage of the power supply line to the oil pump midway, etc. If the transformer continues to operate, the temperature of each part of the transformer will rise abnormally. To prevent this,
A method has been adopted in which an oil flow indicator is equipped with an opening/closing means to detect an oil flow interruption as an electrical signal, generate an alarm, and interrupt the transformer circuit.

However, in the DC section, the transformer and oil pump do not need to operate, and the oil flow will naturally be interrupted. It is necessary to determine which section the vehicle is traveling on. The means for this is generally to link the AC/DC switch with the opening/closing means attached to the oil flow needle, so that in the DC section, an alarm to cut off the transformer circuit is not generated when the oil flow is interrupted. However, this would require modification of equipment other than the transformer and modification of the wiring.

This invention was made in order to solve one or more problems, and it is an oil feed type transformer for vehicles that has the above opening/closing function with an extremely simple configuration and eliminates the work required to modify equipment and wiring other than the transformer. The main purpose is to provide

Another object of the present invention is to provide a first contact that closes in response to an oil flow interruption, and a magnetic field that is generated in each part of the transformer when the transformer receives power and is excited, or when a load is applied to the low voltage side. The circuit includes a circuit in which λ-th contacts closed by this magnetic field are connected in series, It is an object of the present invention to provide an oil feed type transformer for a vehicle configured to issue an alarm only when both second contacts are closed.

The invention will now be described with reference to embodiments shown in the drawings.

FIG. 1 shows the main circuit configuration of the present invention, and in FIG. The magnetic reed switch 1.2, which is the No. 1 contact, is connected in series by a transformer protection circuit wiring 3 consisting of terminals a and b to which an alarm (not shown) is connected. It is preferable that the reed switch l is one that opens and closes depending on the direction of the magnetic field generated by a permanent magnet interlocking with the rotating vane of the oil flow indicator, and opens and closes when the oil pump is operating and the oil flow is normal. It is configured to close when the oil pump stops for some reason and the oil flow is cut off. The reed switch is placed at an appropriate position where a magnetic field M is generated by the operation of a transformer (not shown), and is kept in a position that closes in response to the generation of the magnetic field M, so that the operation of the transformer is prevented. When the motor is stopped and no magnetic field M is generated, the reed switch is open.

The contact operation in the above circuit configuration is as follows.

(1) When the vehicle is running in an AC section and the oil pump is operating and the oil flow is normal, reed switch l is open and reed switch co is closed, as shown in the same figure (a), and the terminal The protection circuit seen from a and b is released.

(2) When the vehicle is running on an AC section and the oil pump stops and the oil flow is cut off, the reed switch / is closed and the reed switch is also closed to protect the vehicle, as shown in the same figure (b). The circuit is closed.

(3) The transformer is not operated while the vehicle is traveling in a DC section,
When the oil pump stops, the reed switch / is closed, the reed switch λ is opened, and the protection circuit is released, as shown in FIG.

That is, the protection circuit is closed and an alarm is issued only in the case of (B) in the same figure, which can be distinguished from the normal operation shown in (A) of the same figure, e→.

Next, the manner in which the reed switch 2 constituting the λ-th contact point is assigned will be described with reference to several embodiments.

The low-voltage side terminal section is considered as a place where the magnetic field M is generated during the operation of the transformer. Figure 2 shows the arrangement of a reed switch that utilizes this magnetic field M. The terminals /l on the low voltage side of the transformer are connected to the external leads 12, and when a load current flows through them, the magnetic field M is applied to the terminals. // and external lead l
Occurs around the conductor. By arranging the reed switch near this conductor, when the transformer is operated and a negative current flows, the reed switch can be closed by the magnetic field M.

Furthermore, in the configuration shown in FIG. 1, when the magnetic field M is weak and the operation of the reed switch is incomplete, the configuration shown in FIG. 3 is available as a means for increasing the magnetic field M. In other words, 1 annular iron core 1
3 is installed so as to surround the low voltage terminal // and (i) external lead l-, and a reed switch is placed in the gap lJa formed in the iron core /. By providing the iron core /3 in this way, the iron core 13, especially the gap /J
The magnetic flux density at a increases significantly compared to the surrounding air region,
The opening/closing operation of the reed switch becomes more reliable.

The first example is another example in which the external lead lλ is wound several times to form a coiled portion l core a.
A reed switch is disposed at the center of the coil, and the magnetic field is stronger than that shown in FIG. 2 by the number of turns of the coiled portion l.

In addition to the above, there is another area around the 5-iron core where the magnetic field is generated during transformer operation. FIG. 3 shows another embodiment in which a reed switch is operated using the magnetic field M from the iron core /Il, and the reed switch is disposed near the iron core yoke /Pa.

The core yoke/Fa often generates a large leakage magnetic field in the core magnetic path, which allows the reed switch to close properly when the transformer receives power and the core is energized. .

As mentioned above, this invention provides information on oil flow stoppage.

It is possible to reliably distinguish whether the problem is caused by an abnormality in the oil pump system or by running in a DC section, and to issue a warning only in the event of an abnormality.Moreover, the configuration is simple and the effect is great.

[Brief explanation of drawings]

FIG. 1 is a wiring diagram for explaining the essential circuit configuration and operation of an embodiment of the present invention, and FIGS. 2(A) and (B) are respectively an embodiment of the same arrangement with the first contact. Figures 3 (A) and 3 (B) are side and front views of another embodiment, respectively, and bait figures (A) and (B) are side views and front views of another embodiment, respectively. Front view, Figure 3 (
A) is a front view of yet another embodiment, and FIG. 3(B) is a front view of another embodiment.
Figure (This is an enlarged front view of part B of ~. l, Co. Reed switch, 3. Transformer protection circuit wiring, //... Terminal, / Co. External lead. l Coil... Coiled part, /J...Iron core, /Ja...Gap, /F...Iron core, /fa...Yoke. M...Magnetic field. In each figure, the same reference numerals indicate the same or equivalent parts. Agent: Kuzu Nobuo - Tail 1 figure (A) (0) I)

Claims (1)

[Claims] (1) In an oil-fed transformer mounted on an AC/DC electric vehicle, a first contact that closes when the oil flow stops and a second contact that closes due to the magnetic field generated when the transformer is operating. 1. An oil feed type transformer for a vehicle, comprising a circuit formed by connecting contacts in series, and a transformer protection means consisting of an alarm means inserted into this circuit. (2) First. 2. The oil-feeding transformer for a vehicle according to claim 1, wherein the second contact is a magnetic reed switch operated by a magnetic field. (3) The vehicle oil feed type transformer according to claim 1, wherein the first contact is a magnetic reed switch that responds to the magnetic field of a permanent magnet at the base that is interlocked with the rotary vane of the oil flow indicator. (Hiroshi) For a vehicle according to claim 1, wherein the contact point C is a magnetic reed switch disposed near a terminal on the low voltage side of the transformer and a conductor of an external lead connected to this terminal. Oil feed type transformer. (3) The vehicle according to claim 1, wherein the second contact is a magnetic reed switch disposed within a gap formed in the annular core surrounding the low-voltage terminal of the transformer. Oil supply (large pressure vessel). (6) The third contact point is a magnetic reed switch disposed at the center of a coiled part formed by winding the low voltage side external lead of the transformer several times. Oil feed type transformer for vehicles. (7) A claim in which the first contact is a magnetic reed switch disposed close to the yoke of the transformer core.
The vehicle oil feed type transformer according to item 1.