JPS58131402A - Accumulator with operational abnormality detection function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an accumulator that increases the pulsating flow and discharge amount of fluid supplied from a pump. This invention relates to an accumulator whose pressure accumulation function can be checked externally.

(Page 3) Conventional accumulators have various inconveniences because even if an abnormality occurs in the pressure accumulation capacity due to a gas leak, it cannot be detected from the outside. For example, if the accumulator of an anti-lock brake mechanism in a car or the like decreases in its accumulating capacity, there will be a time delay in the anti-lock mechanism on the front brake side, which can lead to accidents such as front wheel slippage, which is extremely dangerous.

An object of the present invention is to provide an accumulator that can automatically detect the presence or absence of an abnormality in pump pressure and internal gas pressure and remotely check its pressure accumulation capacity.

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

The accumulator has a cylindrical body l as shown in Figure 1.
One end 11 has a joint part 2 that communicates with the discharge side piping of a hydraulic pump (not shown), and the other end has a lid 3 airtightly fitted through a sealing member such as an O ring and a backup ring 31, and a stopper. It is fixed with a ring 3b. An air valve 5 capable of filling air is airtightly fixed to the lid 3 via an O-ring 5a.

A diaphragm 6 is fitted airtightly and slidably into the main body 1 via an O-ring and a backup ring 6a.
The interior is divided into a hydraulic chamber A communicating with the joint portion 2 and a gas chamber BK communicating with the air valve 5.

In this type of accumulator, the feature of the present invention is that a cylindrical housing 7 that protrudes into the gas chamber B of the main body 1 is installed in the center of the unit 3, and a reed switch 8 is built in the hollow interior of the housing 7. At the same time, a magnet 10 is arranged around the outer periphery of the housing 7 so as to be interlocked with the diaphragm 6.

The switch case 9 is attached to the housing 7 so as to be displaceable in the axial direction by a securing means such as screwing, so that the reed switch 8 fixed to the switch case 9 can be positioned along the axial direction of the housing 7. That's how it is.

(Page 5) The cover 3 of the main body 1 is covered with a cover 11 made of an elastic material to prevent dust from entering and impact. It is connected to external electrical display means (see Figure 3) or alarm means.

On the other hand, the magnet 10 slidably disposed on the outer periphery of the housing 7 has one axial end engaged with a spring 13 stretched across the lid 3 via a spring receiver 14, and the other end A spring 15, whose side is stretched between the diaphragm 6 and the diaphragm 6, is engaged via a stopper 16. Thus, the spring receiver 14 pressed against the magnet 10 and the spring 13.15
and a stopper 16, and is displaced along the outer periphery of the housing 7 to a position where the pressing forces of the barbs 13 and 15 are balanced, and the reed switch 8 in the housing 7 is opened and closed by the change in position. ing.

Further, on the outer periphery of the housing 7, in order to restrict the movement of the i-gnet 10 within a predetermined range, there are locking portions 17 consisting of protrusions or stepped portions at the front (tip @) and rear (implantation base m1) K, respectively. Form .18. The stopper 16 is slidably fitted into the diaphragm 6, and is assembled so as to be locked to a circlip 19 provided inside the lower part of the diaphragm 6, and the inner diameter edge that engages with the magnet 10 is connected to the housing. It is configured to be located outside the tip of the tip side locking portion 17 fixedly attached to the tip.

However, since the accumulator of the present invention electrically detects the position of the diaphragm 6 using the reed switch 8 and the magnet 10 as described above, in order to maintain good sensitivity, at least the members around the magnet 10, i.e. , housing 7, switch case 9, spring 13, spring receiver 14
, non-magnetic material is used for the stopper 16 and the magnet locking portions 17,18.

Next, the present invention will be explained in detail.

First, in order to use the terminal, connect the joint part 2 of the accumulator 1 to the discharge side piping of the hydraulic pump, fill the gas chamber B with high pressure gas via the air valve 5, and connect the lead switch (the first one) of the reed switch 8. (page 7) Connect 12 to an external display device or other alarm device.

When filling the high-pressure gas, the pump pressure and the gas pressure are set so as to be balanced approximately at the middle of the sliding stroke of the diaphragm 6. Therefore, when the pressure of the hydraulic pump decreases or the gas pressure becomes higher than the set value, the diaphragm 6 is displaced toward the hydraulic chamber A until the two pressures are balanced.
Conversely, if the hydraulic pump pressure is p higher than the set value or the system pressure is lower than the set value due to leakage of the sealed gas, the diaphragm 6 is displaced to the gas chamber BM until both pressures are balanced.

In the present invention, a reed switch 8 is provided in the housing 7 of the accumulator main body 1, and a magnet 10 that is linked to the movement of the diaphragm 6 via springs 13 and 15 is slidably fitted on the outer periphery of the housing 7. Therefore, as shown in the explanatory diagram of FIG. 2, when the magnet 10 is near the contact point (imaginary line range) of the reed switch 8, the NS pole is induced at both ends of the switch 8, the contact turns ON, and current flows through the conductor 12. flows. On the other hand, when the magnet 10 moves a predetermined distance with the movement of the diaphragm 6 and the induced magnetic force decreases, the switch 8 is elastically turned off and the current in the conductor 11 stops flowing. The accumulator is in normal operating condition within the stroke range that is the sum of the diaphragm movement stroke due to the pump's pulsating flow and used discharge amount, and the diaphragm movement stroke due to variations in gas pressure and pump discharge pressure; otherwise, there is some abnormality. Therefore, by adjusting the shape of the magnet 10 and the positional relationship of the reed switch 8 so that the reed switch 8 is turned on in the normal stroke range and turned off in the abnormal stroke range, it is possible to determine whether or not there is an abnormality in the accumulator. This means that it can be checked externally. For example, if you want to display an abnormal condition with a lamp, as shown in Figure 3, when the reed switch 8 is OFF, the contact 21 of the relay 20 is turned ON, lighting up the lamp 22, and the reed switch 8 is turned ON.
The circuit may be configured so that the contact 21 of the relay 20 is turned OFF and the lamp 22 is turned off at the time of (9th negative).

In addition, as shown in FIG. 4, the reed switch 8 is attached to a magnet 10.
When it moves away from the contacts of the switch 8 by a certain distance, magnetic force is induced in one contact of the switch 8 and attracts the other contact, and as a result, the stroke of the diaphragm 6 becomes abnormal as shown by the imaginary line in Fig. 4. Even though the state is within the range, the switch 8 may turn on and send the same electrical signal as in the normal state. Therefore, the movement of the magnet 10 is
It is necessary to restrict it to the range shown by d in the figure.

In the present invention, this problem is solved by stopping the magnet 10 at the front engaging part 17 and the rear engaging part 18 formed on the outer periphery of the housing 7.

That is, in FIG. 1, the diaphragm 6 and the stopper 16
Since the spring 15 between them always has a higher load than the spring 13 of the spring receiver 14 and the tension body 3, when the diaphragm 6 moves to the right side in the figure, the barb 13 bends and the magnet 10
is pushed by the stopper 16 and moves to the right in the figure. As the diaphragm 6 moves further to the right, the magnet 10 and the spring receiver 14 (see page 10) are locked to the rear stop portion 18 of the housing 7, but after that the spring 15 is deflected, so the diaphragm 6 is moved independently. Any further movement to the right is permitted. On the other hand, if the diaphragm 6 moves to the left side in the figure, the circlip 1
Stopper 1 engaged with diaphragm 6 via 9
6 moves along with the diaphragm 6, the magnet 10 moves to the left in the figure due to the expansion of the spring 13. In this case, the front locking part 17 of the housing 7 with 10 magnets
However, since the gap between the inner peripheral edge of the stopper 16 and the nozzle 7 is larger than the protruding length of the locking part 17, the stopper 16 passes through the locking part 17. Move independently. Therefore, if the mounting position of the stop 17.18 is set so that the magnet 10 is locked before opening the reed switch 8 and attracting the other contact,
The movement of the magnet with respect to the stroke of the diaphragm 6 is regulated within a desired range, so that the reed switch 8 can always be kept open within the abnormal stroke range of the diaphragm 6.

(Page 11) As described above, since the present invention has a structure that electrically detects the movement of the diaphragm of the accumulator, it is possible to prevent abnormal operation of the accumulator by giving this electric signal to an external display device or alarm device, etc. The presence or absence of such information can be checked automatically and remotely.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of an accumulator showing an embodiment of the present invention, Figs. FIG. 2 is a schematic electrical circuit diagram showing the relationship between FIG. 2... Joint part, 3... Lid body, 5... Air valve, 6... Diaphragm, 7... Housing,
8... Reed switch, 10... Magnet, 13
．． 15... Spring, 14... Spring receiver, 16... Stopper 117, 18... Locking portion, 19... Circlip. Patent applicant: Showa Seisakusho Co., Ltd. JP-A-58-131402 (4)

Claims (3)

[Claims] (1) Inside the cylindrical body (1), there is a hydraulic chamber (A) including a joint part (2) to the pump discharge side piping, a gas chamber (B) equipped with an air valve (5), and a diaphragm (6).
In the accumulator which is partitioned through the airtight gas chamber (B), a nozzle (7) protruding into the gas chamber (B) is installed in the center of the lid (3) of the gas chamber (B), which is formed airtight. A KIJ-de switch (8) is fitted into the hollow interior of the housing (7), and a magnet (10) for exciting the reed switch (8) is movably disposed around the outer periphery of the housing (7). , one end of the magnet (10) is engaged with a spring (13) stretched between the lid (3) via a spring receiver (14), and the other end of the magnet (10) is
a spring (15) stretched between the diaphragm (6);
An accumulator having an operation abnormality detection function, characterized in that the accumulator is engaged through a stopper (16). (W42 page)' (2) Magnet on the outer periphery of the housing (7) (10)
A lock 5 (17) that engages with the end of the magnet (10) is fixedly installed, and the magnet (10)
The accumulator according to claim 1, wherein the movement stroke of the accumulator is regulated within a desired range. (3) Connect the outer periphery of the stopper (16) to the diaphragm (6
) is engaged with the circlip (17) formed on the inner circumferential wall of the magnet (lO), and the stopper (16) is engaged with
The gap between the inner peripheral edge of the housing (7) and the housing (7) is
7) The accumulator according to claim 2, wherein the protruding length of the front side locking portion (17) is greater than the length of the projection.