JPH0341108Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an operating device for a priming vacuum pump in a water pump.

[Prior Art] Generally, a vacuum pump is used as a priming device built into a water pump. The vacuum pump for priming is installed on the drive shaft of the water pump via a clutch, and the power is transmitted and disconnected by connecting and disconnecting the clutch when the water pump is started. There is. An example of an electric device for this type of vacuum pump is shown in Fig. 1. 1 is a water pump, 2 is its drive shaft, 3 is a vacuum pump, and 4 is its drive shaft, which is cylindrical in shape. It is fitted onto the drive shaft 2.

5 is a clutch that transmits and disconnects power between the drive shaft 2 of the water pump 1 and the drive shaft 4 of the vacuum pump 3;
6 is a clutch fork, 7 is a spool, and 8 is a switching lever for connecting and disconnecting the clutch 5 via the spool 7 and the clutch fork 6.

By the way, in the conventional device, when power is extracted from the drive shaft 2 of the water pump 1 to drive the vacuum pump 3, it is necessary to manually operate the switching lever 8 to connect the clutch 5, and also to drive the vacuum pump 3. It is necessary to manually operate the throttle in order to increase the speed of the engine to the required rotational speed at the same time as the engine starts, and to decelerate it when the pumping is completed, which has the disadvantage of being cumbersome to operate.

[Purpose of the invention] This invention electrically connects and disconnects the drive shaft of the water pump to the drive shaft of the vacuum pump using a switch on the operation panel installed on the side panel of the pump chamber. To provide an operating device for a priming vacuum pump in a water pump, in which the speed of the engine is automatically increased to the required rotational speed when the pump starts driving, and the engine is automatically decelerated when pumping is completed.

[Structure of the device] This device attaches the drive shaft of a vacuum pump via a clutch to the drive shaft of a lift pump driven by an engine, operates the clutch with a switching lever, extracts power from the lift pump, and generates a vacuum. A device for driving a pump, which is connected to a switching lever and has a forward rotation coil that moves the switching lever in the clutch connection direction when energized, and a reverse rotation coil that moves the switching lever in the clutch disengagement direction when energized. The rotary solenoid and the start switch, which is installed on the operation panel such as the side plate of the pump chamber, and when pressed, energizes the forward rotation coil of the rotary solenoid and self-maintains the energized state for a predetermined period of time, and the start switch that is installed on the operation panel of the side plate of the pump chamber, etc. It is connected to a stop switch that, when pressed, energizes the reversing coil of the rotary solenoid and holds the current-carrying plate self-holding for a predetermined period of time, and a stop switch that is connected to the switching lever and uses pressure water from the pump to turn the switching lever into a clutch. The hydraulic cylinder is connected to a throttle that increases or decelerates the engine speed, and is energized with a slight delay in relation to the pressing of the start switch. A priming vacuum pump for a water pump consisting of a DC solenoid that operates the slot in a decelerating direction by the action of a spring, and a pressure switch installed in the water pump piping that detects the completion of water pumping and turns off the power to the DC solenoid. The present invention provides an operating device for the following.

Further, the electric circuit of the starting switch is equipped with an operation release limit switch that prevents energization when the engine rotation speed exceeds a certain rotation speed.

[Operation] When the start switch is pressed, the forward rotation coil of the rotary solenoid is energized for a predetermined period of time, the switching lever is moved in the direction of clutch connection, and the vacuum pump is started. In connection with this
The DC solenoid is energized and the throttle is automatically operated in the speed increasing direction to increase the engine speed and bring the water pump closer to the state where it can pump water.

When pumping is complete, the pressure switch de-energizes the DC solenoid and the spring moves the throttle in the deceleration direction, decelerating the engine.

Further, when pumping is completed, the hydraulic cylinder moves the exchange lever in the direction of disengagement of the clutch by the pressure water from the pump. Note that the power supply to the forward rotation coil of the rotary solenoid is cut off after a predetermined period of time has elapsed after the start switch is pressed. This automatically stops the vacuum pump.

The vacuum pump can also be stopped by a stop switch.

When the engine speed reaches a certain level, a limit switch is activated to stop the vacuum pump from operating.

[Example] The details of this invention will be explained below using the example shown in FIGS. 2 to 5.

Figure 2 shows a mechanism for automatically switching the clutch of a vacuum pump.
11 is a vacuum pump having a structure similar to that shown in FIG. 1, 12 is a switching lever whose middle portion is pivotally attached to a bracket 13 fixed to the casing of the vacuum pump 11, and 14 is a switching lever into which the lower end of the switching lever 12 is fitted. Although not shown in the drawing, the clutch fork is fixed together with the locked spool, and this clutch fork is connected to the clutch that transmits and disconnects power between the drive shaft of the lift pump and the drive shaft of the vacuum pump. has been done. 15 is a hydraulic cylinder for stopping the vacuum pump, which is operated by pressure water from a water pump installed above the vacuum pump 11;
A switching lever 12 is inserted into the tip of the switch 6. 1
7 is a pump chamber side plate, 18 is a rotary solenoid fixedly attached to a part thereof, and an arm 20 is fixed integrally to the rotor 19, and the free end of this arm 20 and the upper end of the switching lever 12 are connected to the rod 2.
1.

FIG. 3 shows the main parts of the mechanism that automatically increases and decelerates the engine while the vacuum pump 11 is in operation. A rod 24 attached to the tip of the plunger 23 of the DC solenoid is connected to the free end of an arm 26 integrally attached to a pivot 25 rotatably pivoted to a part of the pump chamber side plate 17. Reference numeral 27 denotes a lever fixedly attached to the pivot shaft 25, and its free end is connected to a throttle (not shown) via a rod 28. Reference numeral 29 denotes an operation release limit switch fixedly attached to the lower part of the pump chamber side plate 17, and is operated by a pin 30 fixed on the pivot shaft 25.

FIG. 4 shows an operation panel attached to the pump chamber side plate 17, which is provided with a start switch 31, a stop switch 33, and a pumping completion indicator lamp 33. There are two similar operation panels installed on the left and right sides of the vehicle body.

Figure 5 shows the electrical circuit of the vacuum pump operating device of this invention, where LS1 is the main switch, LS2, LS3
31 is a limit switch provided corresponding to the arm 20 attached to the rotor 19 of the rotary solenoid 18; 29 is a limit switch for releasing the operation;
is a start switch, 32 is a stop switch, 18a,
18b is a forward and reverse rotation coil of the rotary solenoid 18, 22a is a coil of the DC solenoid 22, R ₁ , R ₂ , R ₃ , R ₄ are relays, TR ₁ , TR ₂ ,
TR ₃ is a timer relay, X ₁ , X ₂ , X ₃ are relays
R ₁ , R ₂ , R ₃ normally open contacts, X ₄ is relay R ₄ normally closed contacts, T ₁ , T ₂ are timer relays TR- ₁ , TR ₂ normally closed contacts, T ₃ is timer relay TR ₃ normally open contacts,
PS is a normally open contact of a pressure switch provided in a part of the water pump piping, L ₁ and L ₂ are vacuum pump drive indicator lamps, and 33 is a pumping completion indicator lamp.

Next, the operation of the vacuum pump operating device of this invention in the above configuration will be explained.

After turning on the main switch LS1, turn on the start switch 31 on the operation panel attached to the pump chamber side plate 17.
is turned on for a certain period of time, the start switch 31 closes and the current flows through relays R ₁ , R ₃ and timer relay TR ₃
As a result, normally open contacts X ₁ and X ₃ of relays R ₁ and R ₃ close instantly, and normally open contact T ₃ of timer relay TR ₃ closes after a certain period of time. Then, first, the normal rotation coil 18a of the rotary solenoid 18 is energized, and the rotary solenoid 1
8 is excited, the rotor 19 is rotated counterclockwise in FIG. 2, and the switching lever 12 is swung clockwise in FIG. 2 via the arm 20 and rod 21, thereby sliding the spool 14. Then, the clutch is connected, and the vacuum pump 11 is driven by extracting power from the main shaft of the water pump through the clutch.
When the vacuum pump 11 is driven, the limit switch LS2 is turned on by the arm 20 attached to the rotor 19 of the rotary solenoid 18, turning on the lamps _L1 and _L2 , and at the same time, current is applied to the timer relay TR- ₁ . flows, the normally closed contact T ₁ of the timer relay TR ₁ opens, the energization to the relay R ₁ is cut off, the contact X ₁ is opened, and the energization to the forward rotation coil 18a of the rotary solenoid 18 is cut off. Therefore, the rotary solenoid 18 is demagnetized and the operation of the switching lever 12 is stopped. Next, after a while after the vacuum pump 11 is driven, the normally open contact _T3 closes due to the delayed operation of the timer relay _TR3 , energizes the coil 22a of the DC solenoid 22, and excites the plunger. Withdraw 23 and move to Rod 24,
Arm 26, pin 25, lever 27 and rod 2
8 to open the throttle and automatically speed up the engine to its required rotational speed. When pumping is completed, the contact PS of the pressure switch closes and the pumping completion indicator lamp 33 lights up, and at the same time, relay R ₄ is energized to open contact X ₄ of relay R ₄ , thereby energizing relay R _3. In order to cut off the current, contact X ₃ of relay R ₃ is opened to cut off the power to the coil 22a of the DC solenoid 22, demagnetizing the DC solenoid 22, and as a result, the plunger 23 of the DC solenoid 22 is activated by the built-in coil spring. etc. to extend the rod 24, arm 26, and pin 2.
5. Reduce the throttle opening via lever 27 and rod 28 to slow down the engine speed. In addition, when the engine rotation speed reaches a certain rotation speed, for example, 1500 rpm or more, the pin 30
opens the operation release limit switch 29, so even if the start switch 31 is turned on, the above operation is released and will not operate. Next, if you want to stop driving the vacuum pump 11, press the stop switch 32 on the operation panel.
When the switch 32 is turned on, the stop switch 32 is closed and the current is applied to the relay R ₂ , which closes the contact X ₂ of the relay R ₂ , and the reversing coil 18b of the rotary solenoid 18 is energized to excite the rotary solenoid 18. The rotor 19 is rotated clockwise in FIG. 2 to swing the switching lever 12 counterclockwise in FIG. 2 via the arm 20 and rod 21, thereby sliding the spool 14 and disengaging the clutch. The drive of the vacuum pump 11 is stopped by disconnecting the power from the drive shaft of the lift pump. At the same time as the clutch is disengaged, the arm 20 attached to the rotor 19 of the rotary solenoid 18 turns on the limit switch LS3, which causes current to flow through the timer relay _TR2 .
Contact T ₂ of TR ₂ opens, which cuts off power to relay R ₂ and opens its contact X ₂ , cutting off power to reverse coil 18b of rotary solenoid 18 and demagnetizes rotary solenoid 18. , the operation of the switching lever 12 is stopped.

[Effects of the invention] As explained above, according to the operating device of this invention, a clutch switching lever for transmitting and disconnecting power between the drive shaft of the lift pump and the drive shaft of the vacuum pump is provided on the side plate of the pump, etc. It can be operated electrically using the control panel, and the speed can be automatically increased to the required rotation speed as soon as the vacuum pump starts driving, and decelerated when pumping is completed, making operation extremely easy. .

Furthermore, when the engine speed exceeds a certain level, safety can be ensured by automatically stopping the vacuum pump or preventing the clutch from engaging.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the power operation of the vacuum pump;
2 and 3 are drawings showing a vacuum pump operating device according to the invention, FIG. 4 is a drawing showing an operating panel, and FIG. 5 is an electric circuit diagram of the vacuum pump operating device. 11...Vacuum pump, 12...Switching lever, 1
8...Rotary solenoid, 22...DC solenoid.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The drive shaft of a vacuum pump is mounted via a clutch on the drive shaft of a lifting pump driven by an engine,
In a device that operates a clutch with a switching lever to extract power from a lift pump to drive a vacuum pump, there is a forward rotation coil that is connected to the switching lever and moves the switching lever in the direction of connection of the clutch when energized; A rotary solenoid that has a reverse coil that moves the switching lever in the direction of clutch disengagement, and a rotary solenoid that is installed on an operation panel such as the side plate of the pump chamber, and when pressed, energizes the forward rotation coil of the rotary solenoid and maintains the energized state for a predetermined period of time. A start switch that self-retains the current for a predetermined period of time, a stop switch that is installed on the operation panel of the side panel of the pump chamber, etc., and that, when pressed, energizes the reversing coil of the rotary solenoid and maintains the energized state for a predetermined period of time, and a stop switch that is connected to the switching lever. It is connected to a hydraulic cylinder that uses pressure water from the lift pump to operate the switching lever in the clutch disengagement direction, and to a throttle that increases or decreases the engine speed, and is energized with a slight delay in relation to the pressing operation of the start switch. , a DC solenoid that operates the throttle in the direction of speed increase when energized and operates the throttle in the direction of deceleration by the action of a spring when not energized, and a DC solenoid installed in the pump piping that detects the completion of pumping and turns off the power to the DC solenoid. An operating device for a priming vacuum pump in a water pump, characterized by comprising a pressure switch. (2) The pump according to claim 1 of the utility model registration claim, wherein the electric circuit of the starting switch has an operation release limit switch that prevents energization at a rotation speed above a certain rotation speed of the engine. Operation device for the priming vacuum pump.