JPS60145432A - Automatic pressure regulator for car mount water pump - Google Patents

Abstract

PURPOSE:To maintain the operational conditions of pump approximately constant by comparing pressure signal at each section of car mount water pump with a setting signal in a control circuit to produce an output for driving a servo motor and regulating the speed of engine. CONSTITUTION:Negative pressure sensor S1 for detecting the suction pressure, delivery pressure sensor S2 and rotation sensor S3 are fixed to a water pump P coupled to an engine E to feed each signal to a controller 6. Said controller 6 will compare each detected signal with a setting signal from a pressure sensor 4 to control the speed regulation lever A of engine E.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic pressure regulating device for a vehicle-mounted water pump mounted on a fire pump vehicle or the like.

B. Prior Art At a fire scene, firefighting work is sometimes carried out by connecting multiple fire hoses to a single fire pump vehicle. In particular, when a water supply route is formed using two fire engines (1), a water supply team and a leading team, to extinguish a fire, 20 fire hoses may be connected to the leading vehicle to spray water. many. Under such water spraying conditions, if one of the fire hoses of the preceding team were to stop spraying water, a large reaction force would be instantaneously applied to the other fire hose and the worker holding the hose due to the water hammer action. This could lead to unexpected accidents. Further, even if the pressure change in the water discharge piping due to the water hammer action reaches an equilibrium state, the discharge amount of the on-vehicle water pump remains constant, so the water discharge pressure of the fire hose discharging water increases.

Therefore, it has been recognized that the reaction force of the sprayed water acting on the tip of the tube exceeds the force of the tip worker to hold the tip of the tube, thereby hindering the operation of the tip of the tube.

In recent years, various safety devices or automatic pressure regulating devices for vehicle-mounted water pumps have been proposed in order to solve the above-mentioned problems. For example, in a fire pump vehicle that uses a diesel engine as a driving source for a water pump, an electronic governor type automatic pressure regulating device is widely used as a control device for (2) the rotational speed of the diesel engine.

The electronic governor type automatic pressure regulating device uses an electronic governor as a means for adjusting the amount of fuel injection in a driving engine, and uses the discharge pressure regulating medium of the on-vehicle water pump to adjust the engine rotation speed due to the amount of fuel injection. It is used as.

If you set the discharge pressure for 10 water discharges of the on-vehicle water pump in advance on the electronic governor type automatic pressure regulating device, even if the number of water discharge ports increases to 20 or 30 or more in later water discharge operations, the initial setting will be maintained. The rotational speed of the driving diesel engine is automatically controlled to maintain the discharge pressure at all times.
Water can be discharged at a constant discharge pressure.

A conventional electronic governor type automatic pressure regulating device is a diesel engine for driving equipped with a fuel injection pump with a governor/actuator, which inputs a signal from an accelerator sensor or a pressure sensor to an arithmetic circuit, and outputs a signal from the arithmetic circuit. The output engine speed control signal is input to a governor actuator (3) and the fuel injection amount is adjusted via a link mechanism. However, in the above-mentioned electronic governor type automatic pressure regulating device, the structure of the electronic governor must be changed depending on the diesel engine model, and because it is specially designed, it lacks versatility and is structurally difficult to use with the fuel injection pump. It could not be installed on gasoline engines that did not require it.

Port 2 Purpose of the Invention The main purpose of the present invention is to
An object of the present invention is to provide an automatic pressure regulating device for an on-vehicle water pump that can discharge water at a constant pressure and has excellent safety and versatility.

Furthermore, another main object of the present invention is to provide an automatic pressure regulating device for an on-vehicle water pump that can be used not only for diesel engines but also for gasoline engines.

C0 Structure of the Invention The present invention is a device for automatically adjusting the discharge (4) pressure of a vehicle-mounted water pump (P) driven by a driving engine (E) of an automobile, the water pump (P)
sensor means (Sl), (S2), and (S3) for detecting the suction pressure, discharge pressure, and rotation speed of the water pump (P); and means (4), (4°) for setting the discharge pressure of the water pump (P).
and the sensor means (Sl), (S2) and (S
A control circuit (6) that compares the signal transmitted from the controller 3) with the signal transmitted from the setting means and performs arithmetic processing, and controls the driving engine (B) based on the signal transmitted from the control circuit (6). The gist of this invention is an automatic pressure regulating device for a vehicle-mounted water pump, which is comprised of a servo motor mechanism (7) that adjusts the rotation speed.

2. Embodiment The drawing is a perspective view illustrating the overall structure of an automatic pressure regulator for a vehicle-mounted water pump according to the present invention.

In the drawing, a driving engine (E) and a vehicle-mounted water pump (P) are mounted on a trunk chassis (not shown). The vehicle-mounted water pump (P) is connected to the vehicle engine (5) via a pump transmission (M) mounted on the vehicle engine (E) so that it can be driven by the vehicle engine (E).

The on-vehicle water pump (I) has a suction pipe (1) branched into a total of 20 pipes (10 on each side of a fire pump vehicle (not shown), 10 on each side) (only 10 are shown in the figure), and a total of 40 pipes (20 on each side of the fire pump vehicle), 20 on each side of the fire pump vehicle (not shown). Discharge pipe (2) branched into (only 20 is shown in the figure)
A cock (C) is provided at the tip of the suction pipe (1) and the discharge pipe (2), respectively.

The vehicle-mounted water pump (P) includes a negative m sensor (Sl) that detects the suction pressure of the vehicle-mounted water pump (P), and a pressure sensor (S2) that detects the discharge pressure of the vehicle-mounted water pump (P).
) and a rotation sensor (S3) that detects the rotation speed of the main shaft of the vehicle-mounted water pump CP). Further, the vehicle-mounted water pump (P) is equipped with a water pumping device (3) equipped with a vacuum pump for priming water.

The discharge pressure setting device (4) or (4") of the above-mentioned on-vehicle water pump (P) can be directly attached to the operation panel (not shown) provided on the left and right sides (6) of the fire pump vehicle, or it can be attached to an extension cord. (5) is attached to a remote control box (not shown) carried by the tip worker.

Each of the above sensor means (Sl), (S2) and (S3)
The output signal of the pressure setting device (4) or (4') is subjected to comparison calculation processing in the control circuit (6), and is outputted as a control signal for the servo motor mechanism (7).

The servo motor mechanism (7) has a servo motor body (8
), electromagnetic clutch (9), gearbox (10), (1
1) and manual adjustment dials (12), (12)
It consists of

The battery (13) is connected as a power source that supplies a stable and constant voltage to the control circuit (6) and the servo motor mechanism (7).

Reference number (14) is the operation panel of the water pumping device (3), and reference number (15) is the electromagnetic clutch that connects and disconnects the driving force to be transmitted to the vacuum pump (not shown) of the water pumping device (3). ,
Reference number (16) is an alarm device for notifying when an abnormality occurs in the vehicle-mounted (7) type water pump (P). As can be understood from the drawings, the operation panel (14) and the alarm device (16) are connected to a control circuit (6).
) is electrically connected to the

The operating procedures for the automatic pressure regulator for vehicle-mounted water pumps are explained below.

After the fire pump truck arrived at the fire scene, the above suction pipe (1
), connect a hose (not shown) that connects the suction pipe (1) with a fire hydrant, a water supply source such as a river, etc., and set the cock (C,) provided at the tip of the suction pipe (1) to the open position. and operate the on-vehicle water pump (P) and water pumping device (3).

The on-vehicle water pump (P) and the suction pipe (1) are discharged into the atmosphere by the water pumping device (3) and become in a negative pressure state, and the suction force due to the negative pressure causes the on-vehicle water pump (P) Water from the water supply source is drawn into the interior of the suction pipe (1) and the suction pipe (1). When the interior of the on-board water pump (P) is filled with water and the water suction operation is completed, the water pumping (8) device (3) automatically stops, and the on-board water pump (P) starts discharging water. becomes possible.

After that, a fire hose is connected to the discharge pipe (2) of the vehicle-mounted water pump (P), and the discharge pressure of the vehicle-mounted water pump (P) is set by the pressure setting device (4). In this state, the discharge pipe (
When the cock (C) of 2) is opened, the pressure setting device (4)
On-board water pump (with a predetermined discharge pressure set by
Water is supplied to the fire hose from P).

Firefighting activities are carried out according to the operating instructions described above, but if for some reason the number of water outlets of the fire hose is increased or decreased during water spraying, the discharge amount of the on-board water pump (P) is constant, so the remaining discharge pipe ( The water discharge pressure in 2) changes. The change in the discharge pressure is detected by a pressure sensor (S2), and the signal from the pressure sensor (S2) is compared with the signal from the pressure setting device (4) in the control circuit (6) and processed. The control circuit (6) transmits a control signal to the servo motor mechanism (7) in order to make the pressure difference zero.

(9) The servo motor mechanism (7) rotates the servo motor body (8) in either forward or reverse direction according to the control signal output from the control circuit (6), and rotates the servo motor body (8) in either forward or reverse direction. 10) and (11), the engine-related lever (A) is displaced to either the speed increasing side or the decelerating side. Due to the displacement of the engine speed regulating lever (A), the amount of fuel injection or the amount of air-fuel mixture supplied changes, and the rotational speed of the driving engine (E) increases or decreases accordingly.

Therefore, the vehicle-mounted water pump (P) driven by the driving engine (E) has its main shaft in order to eliminate the difference between the set pressure set by the discharge pressure setting device (4) and the actual discharge pressure. The rotation speed is adjusted.

By the way, when the automatic pressure regulator is activated, if the suction pressure of the on-vehicle water pump (P) reaches a pressure on the verge of cavitation, the tip of the hose connected to the suction pipe (1) may be connected to a river, etc. If air is inhaled by jumping out of the water supply source (10), if the difference between the discharge pressure and the set pressure exceeds the adjustable range of the automatic pressure regulator, or if the suction side or discharge side hose is damaged, etc. If the driving engine (E) revs up to the maximum speed for some reason, the control circuit (6) will control each sensor means (Sl), (S2), (
Based on the signal from S3), it is determined that an abnormality has occurred in the operating state of the on-vehicle water pump (P), and the alarm device (16) is activated.
This notifies the operator of the occurrence of an abnormal situation, and within a few seconds, the rotation speed of the driving engine (E) is reduced to an idle state, and the water supply state by the on-vehicle water pump (P) is stopped.

In addition, in the automatic pressure regulating device for the above-mentioned on-vehicle water pump,
By switching the electromagnetic clutch (9) of the servo motor mechanism (7) to a disconnected state, the manual adjustment dial (12)
It is also possible to manually adjust the discharge pressure of the on-vehicle water pump (P) by operating the .

Further, in the automatic pressure regulating device according to the present invention, a worker at the end of the fire hose can operate the discharge pressure setting device (4°) attached to the remote control box (11) via the remote control cord (5). The discharge pressure of the on-vehicle water pump (P) can be remotely adjusted at the tip of the cylinder.

E9 As described in detail of the invention, the automatic pressure regulating device for a vehicle-mounted water pump according to the present invention compares and processes the signal from the sensor means and the signal from the setting means in the control circuit, and the control circuit A servo motor mechanism is driven by the output signal from the servo motor mechanism, and the displacement of the engine speed regulating lever caused by the drive of the servo motor mechanism is used to increase or decrease the engine speed, and the vehicle-mounted water pump is driven. Regardless of whether the running engine is a gasoline engine or a diesel engine, the operating conditions of the water pump can be maintained substantially constant regardless of the number of water outlets.

Furthermore, the device of the present invention detects that an abnormality has occurred in the operating state of the vehicle-mounted water pump by each sensor means.
The automatic control circuit is configured to reduce the rotational speed of the driving engine to an idling state (12) and stop the water supply operation by the on-vehicle water pump. Safety is significantly improved compared to pressure equipment.

Thus, the present invention provides an automatic pressure regulating device that is notable for being a significant improvement over conventional devices in terms of safety, operational accuracy, and versatility.

[Brief explanation of drawings]

The drawing is a perspective view illustrating the overall structure of an automatic pressure regulator for a vehicle-mounted water pump according to the present invention. (P) --- Vehicle-mounted water pump, (El--propulsion engine, (Sl), (S2), (S3) --- Sensor means,
(4), (4″) - discharge pressure setting means, (6)...
-Control circuit, (7).-Servo motor mechanism.

Claims (1)

[Claims] (1) A device for automatically adjusting the discharge pressure of an on-vehicle water pump driven by a vehicle's running engine, comprising a sensor means for detecting the operating state of the water pump, and a means for setting the discharge pressure of the water pump. and a control circuit that compares the signal from the sensor means with the signal from the setting means and performs arithmetic processing, and a servo motor mechanism that adjusts the rotational speed of the driving engine based on the signal from the control circuit. Automatic pressure regulator for water pumps.