JPH0723587Y2 - Pump controller - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pump control device equipped in a power sprayer or the like, and more specifically, automatically depressurizes a pump according to the operation of a pump driving motor. The present invention relates to a pump control device that can be performed.

[Conventional technology]

5 and 6 relate to the prior art, FIG. 5 is a vertical sectional view showing a motor a, a pump b and a pressure regulating valve f together with a coupling relationship, and FIG. 6 is a motor a from an angle different from that of FIG. It is a side view showing pump b and pressure regulation valve f. The pump b is driven by the motor a, and the pressure regulating valve f has a pressure regulating port c connected to the discharge side of the pump b, and a spill port d communicating with the pressure regulating port c via the passage e to discharge spillage. And adjusts the discharge pressure of the pump b to a set value. The valve seat g is arranged in the middle of the passage e, and the valve body h can be seated on the valve seat g from the side opposite to the pressure adjusting port c. The elastic body i is contracted between the valve body h and the spring seat j, and urges the valve body h toward the valve seat g. The cap-shaped handle k is eccentrically arranged with respect to the spring seat j and is rotatably disposed, and the spring seat j has a guide shaft m that projects upward and is inserted into a cam groove 1 on the lower surface side of the cap-shaped handle k. ing. The depth of the cam groove 1 changes along the rotation direction of the cap-shaped handle k, and the guide shaft m moves up and down according to the rotation position of the cap-shaped handle k. As a result, the preload of the elastic body i, That is, the pressure regulating value of the pressure regulating valve f is adjusted.

When the motor a is started without depressurizing the pump b, the load on the motor a is excessively large, which makes it difficult to start the motor a, burns the motor a, or deteriorates the water absorption of the pump b. Therefore, there is a problem that the pump b is burned out. In addition, even after the motor a is stopped, the pump b
If the pressure is not released, harmful chemicals may be blown out and the worker may be exposed when the discharge hose is removed. Therefore, in the conventional pump b, the operator needs to turn the cap-shaped handle k to make the pressure regulating value of the pressure regulating valve f zero before starting and stopping the motor a.

[Means for Solving the Problems]

In the prior art, the operator needs to operate the cap-shaped handle k one by one before starting the motor a and accompanying the stop of the motor a, which is complicated and may be forgotten.

An object of the present invention is to provide a pump control device capable of omitting the pressure relief operation of the pump which must be performed prior to starting the position detection switch and accompanying stop of the position detection switch.

[Means for Solving the Problems]

The invention will be described using the reference numerals of the drawings corresponding to the embodiments.

The pump control device that is the premise of this invention is a pump (2).
A motor (1) for driving the motor (1) and a pressure regulating valve (6) capable of adjusting the discharge pressure of the pump (2) according to the displacement position of the operating member (11). Further, in the pump control device of the present invention, the operation member (11) including the cap-shaped handle is provided.
Has a stop position (12a), a starting position (12b) and a working position (12c, 12d), and the pressure regulating valve (6) is an operating member (11).
At the stop position (12a) and the start position (12b), the discharge pressure of the pump (2) is set to zero. The displacement position of the operating member (11) is detected, the motor (1) is stopped at the stop position (12a), and the motor (1) is allowed to move at the start position (12b) and the work position (12c, 12d) to move. A position detection switch (19) that can be turned on and off according to the protrusion amount of the portion (20) slides the movable portion (20) on the inner peripheral surface (15) of the cap-shaped handle (11), The contour of the inner peripheral surface (15) of the cap-shaped handle (11) is
The cap-shaped handle (11) is at the stop position (12a).
And the starting position (12b) and the operating position (1
2c, 12d), the amount of protrusion of the movable part (20) is switched.

[Action]

When starting the motor (1), the operating member (11) of the pressure regulating valve (6) is switched from the stop position (12a) to the start position (12b). The pressure regulating valve (6) sets the discharge pressure of the pump (2) to zero at the stop position (12a) and the starting position (12b) of the operating member (11), and the pump (2) before starting the motor (1). Is in a depressurized state. The position detecting means (19) detects the displacement position of the operating member (11) of the pressure regulating valve (6), and allows the motor (1) to be started at the starting position (12b). Thus, the motor (1) is started.

When the motor (1) is stopped, the operating member (11) is switched from the work position (12c, 12d) to the stop position (12a). The position detecting means (19) stops the motor (1) along with the switching of the operating member (11) to the stop position (12a). On the other hand, the pressure regulating valve (6) has a pump (2) as the operating member (11) is switched to the stop position (12a).
To zero the discharge pressure.

〔Example〕

The invention will be described below with reference to the embodiments shown in FIGS.

FIG. 1 is a vertical sectional view showing a motor 1, a pump 2 and a pressure regulating valve 6 together with a coupling relationship. The pump 2 is driven by the motor 1, the pressure regulating valve 6 is driven by the pump 2 by the motor 1, and the pressure regulating valve 6 regulates pressure via the passage 5 and the pressure regulating port 3 connected to the discharge side of the pump 2. The discharge pressure of the pump 2 is adjusted by providing a spill port 4 communicating with the port 3 and discharging the spillage. The valve seat 7 is arranged in the middle of the passage 5, and the valve body 8 is freely seated on the valve seat 7 from the side opposite to the pressure adjusting port 3. Bullet 9
Is contracted between the valve body 8 and the spring seat 10, and urges the valve body 8 toward the valve seat 7. The cap-shaped handle 11 is rotatably supported with its center line aligned with the handle support portion 17 that is eccentric to the spring seat 10, and the spring seat 10 projects upward and is in a cam groove on the lower surface of the cap-shaped handle 11. It has a guide shaft 14 inserted in 13.

2 and 4 are views of the cap-shaped handle 11 viewed from the lower surface side and the upper surface side, respectively. Cap handle
11 has an inner peripheral surface 15 having a substantially circular shape. Cam groove 13
Is a cap-shaped handle with a diameter smaller than the inner surface 15
It is formed into an arc that is concentric with 11, and is recessed at 90 ° intervals 12a, 12b,
It has 12c and 12d. The depressions 12a, 12b, 12c, 12d correspond to the stop position, the start position, the weeding work position, and the spraying work position of the cap-shaped handle 11, respectively. The inner peripheral surface 15 has a recess 16 at a position opposite to the recess 12a with respect to the center of the cap-shaped handle 11.

FIG. 3 is a cap-shaped handle along the cam groove 13 of FIG.
11 is a sectional view of FIG. The cam groove 13 has a deep and equal depth in the range from the depression 12a to the depression 12b, and the depth is gradually reduced in a portion extending from the depression 12b to the depression 12d. The guide shaft 14 shown in FIG. 1 is pushed downward as it is located in the shallow portion of the cam groove 13 to increase the preload of the elastic body 9, so that the discharge pressure of the pump 2 is adjusted. , Increases as the guide shaft 14 is located at a shallower position in the cam groove 13. The regulated value of the discharge pressure of the pump 2 is zero when the guide shaft 14 is located in the recesses 12a and 12b, and is maximum when the guide shaft 14 is located in the recess 12d. Hollow
When it is located at 12c, it is almost halfway between zero and the maximum value. In addition, the guide shaft 14 has the recesses 12a, 12b, 12c, 12
When it is located at d, the cap-shaped handle 11 is required to have a large rotational operation force when it is fitted into them and is detached from them.

In FIG. 1, the position detection switch 19 has a movable portion 20 fixed to the surface of the handle support portion 17 opposite to the spring seat 10 and protruding toward the inner peripheral surface 15. Position detection switch 19
When the amount of protrusion of the movable portion 20 is equal to or larger than a predetermined value and smaller than a predetermined value, the power is turned off and on, respectively, and the electric power of the motor 1 is sent via the lead wire 18 and the position detection switch 19. The movable portion 20 slides on the inner peripheral surface 15 at the tip portion as the cap-shaped handle 11 rotates with respect to the handle support portion 17, and when the movable portion 20 is located in the recess 16, the position detection switch 19 is turned off. Then, the power supply to the motor 1 is cut off, the motor 1 is stopped, and the movable portion 20 has an inner peripheral surface other than the recess 16.
When it is located at the portion of 15, the position detection switch 19 is turned on, and power supply to the motor 1 is permitted.

The operation of the embodiment will be described.

When the motor 1 is started, the cap-shaped handle 11 of the pressure regulating valve 6 is switched to the stop position 11a or the start position 12b.
When the cap-shaped handle 11 is at the stop position 11a and the start position 12b, the guide shaft 14 is deeply inserted into the cam groove 13 and is at a high position, so that the preload of the elastic body 9 is almost zero. The pressure regulating value of the discharge pressure of the pump 2 by the pressure regulating valve 6 is zero, and the pump 2 is in a depressurized state before the motor 1 is started. On the other hand, the movable portion 20 of the position detection switch 19 escapes from the recess 16 of the inner peripheral surface 15 as the cap-shaped handle 11 is switched from the stop position 11a to the start position 12b, and the protrusion amount is reduced. , Position detection switch
19 turns on. As a result, the motor 1 is connected to the lead wire 18
Also, electric power is supplied through the position detection switch 19 to start the operation.

When the motor 1 is stopped, the cap-shaped handle 11 is switched from the weeding work position 12c or the spraying work position 12d to the stop position 11a. Since the movable portion 20 of the position detection switch 19 enters the recess 16 of the inner peripheral surface 15 to increase the protrusion amount,
The position detection switch 19 is turned off, and the motor 1 stops the supply of electric power and stops. On the other hand, the guide shaft 14 is
At the position of the depression 12a, the preload of the elastic body 9 becomes zero, the pressure regulation value of the discharge pressure of the pump 2 by the pressure regulating valve 6 becomes zero, and the pump 2 is in the pressure relief state.

[Effect of device]

According to this invention, the operating member of the pressure adjusting valve adjusts the pressure adjusting value of the discharge pressure of the pump, simultaneously controls the driving and stopping of the motor, and the pump automatically operates at the stop position and the starting position of the operating member. It is in a depressurized state. Therefore, the operator is relieved from the trouble of depressurizing the pump one by one before starting the motor and accompanying the stop of the motor, and prevents the situation such as the inability to start or the burning due to forgetting to depressurize the pump. can do.

[Brief description of drawings]

1 to 4 relate to an embodiment of the present invention, FIG. 1 is a vertical sectional view showing a motor, a pump, and a pressure regulating valve together with a coupling relationship, and FIG. 2 is a view of a cap-shaped handle as seen from the lower surface side,
FIG. 3 is a cross-sectional view of the cap-shaped handle along the cam groove of FIG. 2, FIG. 4 is a view of the cap-shaped handle seen from the upper side, and FIGS. 5 and 6 are related to the prior art, and FIG. Is a vertical sectional view showing a motor, a pump and a pressure regulating valve together with a coupling relationship, and FIG. 6 is a side view showing the motor, the pump and the pressure regulating valve from an angle different from FIG. 1 ... motor, 2 ... pump, 6 ... pressure regulating valve, 11 ... cap handle (operating member, rotary cap), 12a
... Dimples (stop position), 12b ... Dimples (start position), 12c
…… Dimples (weeding work position, work position), 12d …… Dimples (spraying work position, work position), 15 …… Inner peripheral surface, 19 …… Position detection switch (position detection means), 20 …… Movable part.

Claims (1)

[Scope of utility model registration request] 1. A motor (1) for driving a pump (2),
A pump control device comprising a pressure regulating valve (6) capable of adjusting the discharge pressure of the pump (2) according to the displacement position of the operating member (11), the operating member (11) comprising a cap-shaped handle. Has a stop position (12a), a start position (12b) and a working position (12c, 12d), and the pressure regulating valve (6) is
At the stop position (12a) and the start position (12b) of the operating member (11), the discharge pressure of the pump (2) is set to zero, and the displacement position of the operating member (11) is detected. At the stop position (12a), the motor (1) is stopped to start the start position (12b) and the working position (12c, 12).
In d), the motor (1) is allowed to drive and the movable part (2
The position detection switch (19) that can be turned on and off according to the amount of protrusion of (0) slides the movable portion (20) on the inner peripheral surface (15) of the cap-shaped handle (11), The contour of the inner peripheral surface (15) of the handle (11) is such that when the cap-like handle (11) is in the stop position (12a), the starting position (12b) and the working position (12).
c, 12d), the pump control device is formed so as to switch the protrusion amount of the movable part (20).