JPH0730922Y2 - Engine rotation control device in pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an engine rotation control device for a pump device,
More specifically, the invention relates to a rotation control device for an engine in a pump device in which the pressure of a liquid discharged from a pump main body, which is interlocked with driving of an engine, is controlled by a pressure control valve and is discharged from a nozzle.

(Prior Art) Conventionally, the engine can be rotated at a high speed when the discharging operation is performed by opening the nozzle, and the engine can be rotated at a low speed when the discharging operation is interrupted by closing the nozzle. This has already been proposed as seen in Japanese Utility Model Publication No. 63-19046. This conventional one controls an engine, a pump main body that is interlocked with the driving of the engine, a nozzle that communicates with the pump main body through a liquid feed passage, a pressure of liquid discharged from the pump main body, and In the liquid feed passage between the control valve and the pump body in a pump device including a pressure control valve that opens when the inside of the liquid feed passage becomes equal to or higher than a set pressure, a piston case and a inside of the case are provided. Hydraulic pressure detection including a piston that is housed and that operates based on a hydraulic pressure that changes in relation to the closing operation position and the opening operation position of the valve body, and a coil spring that biases the piston in one direction. In the case where liquid is discharged from the nozzle, an interlocking device that interlocks with the operation of the piston is provided between the hydraulic pressure detector and a rotation control member such as an engine cabana. , The valve body closes In the location, the liquid feed passage becomes high, the piston of the hydraulic pressure detector is moved by overcoming the coil spring, the engine is rotating at high speed. Further, by closing the nozzle, the liquid pressure inside the liquid supply passage becomes equal to or higher than a set pressure, the valve body opens, and the liquid pressure in the liquid supply passage becomes low, and the liquid pressure detector The piston moves by the force of the coil spring, and the engine rotates at a low speed.

(Problems to be solved by the invention) However, according to this conventional one, in addition to the pressure control valve,
Since the hydraulic pressure detector needs to be specially provided, there is a problem that the structure is complicated and the cost becomes high.

In addition, the engine does not rotate at high speed unless the piston of the hydraulic pressure detector operates for a predetermined stroke, and the piston has a high pressure up to a set pressure of the liquid discharged from the pump main body which is linked to the drive of the engine. Unless it becomes a predetermined stroke, the liquid pressure discharged from the pump main body does not reach the set pressure unless the engine rotates at a high speed, so the operation of the hydraulic pressure detector reduces the rotation speed of the engine. When performing the discharging work by opening the closed nozzle again in a controlled state, the piston of the hydraulic pressure detector gradually operates as the pressure of the liquid discharged from the pump body that is driven at low speed gradually increases, and the engine rotation Is gradually increased in speed, and the pump body driven by this engine is gradually increased in speed. Therefore, after opening the nozzle, it takes a long time to reach the set pressure in the liquid supply passage, and there is a problem that the set pressure is lost for a long time until the discharge operation can be performed.

Further, when the valve body of the pressure control valve is opened by closing the nozzle and the hydraulic pressure in the liquid supply passage becomes low and the rotation of the engine becomes low, the valve body is controlled by the force of the control spring in the pressure control valve. Therefore, if the pressure of the liquid discharged from the pump body gradually increases in this state, the valve body floats and the inside of the liquid supply passage becomes low pressure again, and the valve body closes. There is also a problem that the operation is performed and this operation is repeated.

The present invention has been devised in view of the above points, and an object thereof is to provide a valve element in a pressure control valve with a simple structure without providing a special hydraulic pressure detector for detecting a change in hydraulic pressure in the liquid supply passage. You can control the rotation of the engine using the operation of
The engine can be rotated at a high speed immediately after opening the nozzle while controlling the rotation of the engine at a low speed. Furthermore, when the rotation of the engine is controlled at a low speed, the valve body of the pressure control valve is maintained in the open operation position. It allows you to do things.

(Means for Solving the Problems) In the present invention, therefore, the engine (1), the pump body (2) interlocked with the driving of the engine (1), the pump body (2) and the liquid feeding passage are provided. Nozzle (4) communicating through
And a pressure control valve (5) for controlling the pressure of the liquid discharged from the pump body (2) and for opening the valve body (51) when the pressure inside the liquid supply passage becomes equal to or higher than a set pressure. A rotation control device for an engine in a pump device provided with a check valve (7) in a liquid feeding passage between the nozzle (4) and a valve body (51) of the control valve (5). A pressure receiving chamber (9) communicating with the liquid feeding passage (3a) between the check valve (7) and the nozzle (4) is provided on the back pressure side of the valve body of the control valve (5), The pressure receiving chamber (9) is provided with a floating body (10) for opening the valve body (51) when the pressure inside the liquid delivery passageway (3a) exceeds a set pressure. An interlocking unit interlocking with the operation of the valve body (51) is provided between the rotation control member of the engine (1).

(Operation) When the pump body (2) is driven, the liquid discharged from the pump body into the liquid supply passage is controlled to the set pressure set by the pressure control valve (5), and the check valve (7) is opened. And nozzle (4)
When the inside of the liquid supply passage (3a) becomes equal to or higher than the set pressure due to the back pressure when the nozzle (4) is closed, the check valve (7) is closed and the check valve ( The fluid pressure between 7) and the nozzle (4) is the floating body (10) of the pressure receiving chamber (9).
And the valve body (51) of the pressure control valve (5) is opened along with the operation of the floating body (10).
The operation of 1) is transmitted to the rotation control member of the engine (1) via the interlocking means, and the engine (1) is controlled to rotate at a low speed. When the nozzle (4) is opened,
The pressure of the liquid accumulated in the liquid supply passage between the nozzle (4) and the check valve (7) immediately drops, and the valve body (51) is driven by the force of the control spring in the pressure control valve (5). ) Immediately closes, and the operation of the valve body (51) is transmitted to the rotation control member of the engine (1) through the interlocking means, and the engine operates at high speed in conjunction with the closing operation of the valve body (51). It is controlled by rotation. Further, when the nozzle (4) is closed, the valve body (51) of the pressure control valve (5) has a hydraulic pressure accumulated in the liquid supply passage between the check valve (7) and the nozzle (4). Since the opening operation is maintained by, the valve body (51) does not repeat the opening and closing operations.

(Embodiment) The control device of the present invention communicates with an engine (1), a pump body (2) which is interlocked with the drive of the engine (1), and the pump body (2) and a liquid feed passage (3). Controlling the pressure of the liquid discharged from the nozzle body (4) and the pump body (2), and the valve body (51) opens when the pressure inside the liquid supply passage (3) becomes equal to or higher than a set pressure. A control device for controlling rotation of an engine in a pump device including a pressure control valve (5), wherein the control valve (5) has a valve chamber at a communication portion where an inlet, an outlet, and a residual liquid communicate with each other. A valve seat (53) in the valve chamber (52a) of a valve body (52) having (52a), and the valve for abutting the valve seat (53) to open and close the inlet side of the residual liquid port. The body (51) is internally mounted, and the valve rod (51a) of the valve body (51) is projected toward the back pressure side of the valve chamber (52a) in the valve body (52), and on the back pressure side, Control spring for pressing the valve body through the Kibenbo (51a) and (51) to said valve chamber (53) (5
4) and the adjusting screw (5) for adjusting the pressing force of the valve body (51).
5) is provided, wherein the inflow port is the discharge port of the pump body (2), and the outflow port is the nozzle (4).
Further, when the residual liquid ports are respectively communicated with the residual liquid pipes (6), the nozzle (4) is closed, and the pressure inside the liquid supply passage (3) becomes equal to or higher than a preset pressure, the valve body (51) opens. Then pump body (2)
The liquid discharged from is discharged to the outside through the residual liquid port.

Therefore, in the illustrated embodiment, the valve seat (52a) is connected to the nozzle (4) in the liquid transfer passage (3a) between the nozzle (4) and the valve body (51) of the safety valve (5). A check valve (7) that allows a flow is provided, and a liquid supply passage (3a) between the check valve (7) and the nozzle (4) is provided on the back pressure side of the valve body of the safety valve (5). A pressure receiving chamber (9) that communicates via a communication passage (8) and receives the tip end portion of the valve rod (51a) is provided, and the liquid feeding passage is provided in the valve rod (51a) in the pressure receiving chamber (9). When the inside of (3a) becomes overloaded, a floating body (10) for opening the valve body (51) is provided, and the floating body (10) and the governor (1a) of the engine (1) rotate. An interlocking device interlocking with the operation of the valve body (51) is provided between the control member and the control member.

The check valve (7) is provided at the outlet (52b) of the valve body (52) of the control valve (5) via a cylindrical holder (11). Then, the valve body (52) valve seat (1
2) and a pressing spring (13) for pressing the check valve (7) in the holder (11), and the check valve (13) is provided by the pressure of the liquid discharged from the pump body (2). 7) moves against the pressing spring (13) to open the outlet (52b), and the communication passage (8) is provided in the valve body (32). .

Further, the floating body (10) is formed integrally with the valve rod (51a), but if it is formed separately from the valve body (51a), it receives a liquid pressure higher than the set pressure in the liquid supply passage (3a). The valve body (51) may be operated by contacting the valve rod (51a).

The interlocking means abuts on the tip of the valve rod (51a) and receives one end of the control spring (54).
A rod (22) provided on the spring bearing (21), an arm (23) having one end pivotally supported on the rod (22) and an intermediate portion pivotally supported by a stationary member, and the arm (23). An operation cord (24) including an inner wire (24a) interposed between the other end and the governor (1a) of the engine (1) and an outer cylinder (24b) guiding the wire (24a). Configure and
By the opening operation of the valve body (51), the inner wire (24
a) is pulled in one direction, and the inner wire (24a) is pushed in the other direction by closing the valve body (51).

In the figure, (4a) is a nozzle valve, (14), (15) and (16) are seal materials, (25) is a coil spring that suppresses excessive interlocking of the governor (1a), and (1b) is a throttle lever. , (1c) is a carburetor, and (1d) is a return spring.

The present invention is constructed as described above, and when the engine (1) is rotated at a high speed, the pump body (2) moves to the liquid feed passage (3).
The pressure of the liquid discharged inside becomes a high set pressure set by the pressure control valve (5) and is discharged to the outside from the nozzle (4). In this case, the valve body (51) is in the closing operation position, and the check valve (7) is in the opening operation position.

Then, when the nozzle (4) is closed, the inside of the liquid transfer passage (3a) between the nozzle (4) and the check valve (7) becomes equal to or higher than the set pressure, and the check valve (7) is opened. Closes instantly,
A hydraulic pressure above the set pressure acts on the floating body (10) of the pressure receiving chamber (9) through the communication passage (8), and the floating body (10) operates and the floating body (10) moves. The valve body (51) of the pressure control valve (5) is opened in conjunction with the operation, and the operation of the valve body (51) is controlled by the governor (1) of the engine (1) via the interlocking means.
It will be transmitted to a). Therefore, the engine (1)
Is controlled to a low speed rotation, the pump main body (2) which is interlocked with the driving of the engine (1) rotates at a low speed, and the liquid discharged from the pump main body (2) into the liquid supply passage (3) becomes a low pressure, It is discharged to the outside from the residual liquid port of the pressure control valve (5). In this case, the nozzle (4) and the check valve (7)
Since the fluid pressure accumulated in the liquid delivery passageway (3a) between and acts on the floating body (10), the valve body (51) is maintained at the opening position.

When the nozzle (4) is opened, this nozzle (4)
The liquid in the liquid feed passage (3a) between the check valve (7) and the check valve (7) flows out from the nozzle (4) to immediately reduce the liquid pressure in the liquid feed passage (3a), The hydraulic pressure acting on (10) becomes small, the valve body (51), which is biased by the control spring (54) in the closing direction, immediately closes, and the closing operation of this valve body (51) is interlocked. Governor (1a) of engine (1) through means
Will be transmitted to. Therefore, the engine (1)
The pump body (2), which is controlled to rotate at a high speed in conjunction with the closing operation of the valve body (51) and operates in conjunction with the drive of the engine (1), rotates at a high speed, and the pump body (2) feeds a liquid feed passage ( The liquid discharged into 3) has a high set pressure. Therefore, after the nozzle (4) is opened, the time until the inside of the liquid supply passage (3) reaches the set pressure is short, and the loss time until the discharge work can be performed at the set pressure can be significantly shortened, and the liquid discharge Therefore, the work efficiency can be improved.

Although the check valve (7) is incorporated in the pressure control valve (5) in the embodiment described above, it may be provided separately from the other pressure control valve (5). In this case, the liquid supply passage (3a) and the pressure receiving chamber (9) are connected by a pipe such as a pipe.

Further, as the interlocking means, a mechanism having a pull-type operation cord (24) or a mechanism having a push-pull type operation cord may be used, so that the structure is not particularly limited.

(Effect of the Invention) As described above, the present invention utilizes the operation of the valve body (51) in the pressure control valve (5), and the rotation control member of the engine (1) is interlocked with the operation of the valve body (51). Since the engine is controlled to operate at low speed and high speed, the structure can be simplified and the cost can be reduced as compared with the conventional example in which a special hydraulic pressure detector is provided for control. In addition, since the engine (1) can be rotated at a high speed immediately after opening the nozzle (4) while controlling the rotation of the engine (1) at a low speed, the nozzle can be opened and discharging work can be performed at a set pressure. The loss time can be greatly shortened and the discharge work efficiency can be improved. Moreover, when the rotation of the engine is controlled to a low speed, the fluid pressure in the liquid feeding passage between the nozzle (4) and the check valve (7) is applied to the floating body (10) to cause the control valve (5 It is possible to maintain the valve body (51) of (1) at the opening operation position, and therefore the valve body (51) does not repeat the opening and closing operations.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing the relationship between the control device of the present invention and a pump device, and FIG. 2 is an enlarged sectional view of only a main part. (1) …… Engine (2) …… Pump body (3a) …… Liquid transfer passage (4) …… Nozzle (5) …… Pressure control valve (51) …… Valve body (7) …… Check valve (9) …… Pressure receiving chamber (10) …… Floating body

Claims (1)

[Scope of utility model registration request] 1. An engine (1), a pump body (2) interlocked with the drive of the engine (1), and the pump body (2).
A valve (51) for controlling the pressure of the liquid discharged from the pump body (2) and the nozzle (4) communicating with the liquid supply passage through the liquid supply passage, and when the pressure inside the liquid supply passage becomes equal to or higher than a set pressure. ) Is a rotation control device for an engine in a pump device including a pressure control valve (5) for opening the nozzle (4)
A check valve (7) is provided in the liquid supply passage between the valve body (51) of the control valve (5) and the check valve (5) on the back pressure side of the valve body of the control valve (5). A pressure receiving chamber (9) communicating with the liquid transfer passage (3a) between the nozzle (4) and the nozzle (4).
The pressure receiving chamber (9) is provided with a floating body (10) for opening the valve body (51) when the pressure inside the liquid feeding passageway (3a) exceeds a set pressure. An engine rotation control device for a pump device, comprising interlocking means interlocking with the operation of the valve body (51) between the (10) and the rotation control member of the engine (1).