JP2005007366A - High-pressure washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure washer the discharge pressure of which can be adjusted. <P>SOLUTION: This high-pressure washer is provided with: a discharge unit 14 having a nozzle 22 for discharging high pressure water; and a washer main body 12 for compressing tap water by using a pump 20 and sending the high pressure water to the unit 14 through a hose 16. The larger the aperture of a discharge port is made by a lever 26 arranged in the unit 14, the more the water pressure in the pump 20 is lowered. The lowered water pressure is detected by a variable pressure detecting switch 56, and the number of revolution of the motor 28 of the pump 20 is increased. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high pressure washer used at home and the like.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, various high-pressure washing machines used for car washing and the like have been proposed (Patent Document 1).
[0003]
Moreover, in the high-pressure washing machine that has been widely used for general households at present, the pump itself for blowing out the high-pressure water does not have a function for adjusting the discharge pressure, and the nozzle adjusts the discharge angle of the high-pressure water mechanically. There is only a mechanism to do this.
[0004]
Therefore, when changing the pressure of high-pressure water, the discharge pressure of the nozzle can only be adjusted to a low pressure side in conjunction with the expansion of the discharge angle of the nozzle. Even if it is desired to use, there is a problem that this water pressure cannot be adjusted, so that it cannot be washed well.
[0005]
Therefore, in view of the above problems, the present invention provides a high-pressure washing machine capable of adjusting the discharge pressure.
[0006]
[Patent Document 1]
JP 2001-104839 A
[0007]
[Means for Solving the Problems]
The invention of claim 1 is a high-pressure apparatus comprising a discharge device having a nozzle for discharging high-pressure water, and a washing machine main body that compresses the supplied water by a pump and sends high-pressure water to the discharge device via a hose. In the cleaning machine, a discharge port adjusting unit that adjusts the opening / closing degree of the discharge port of the nozzle by adjusting a lever provided in the discharge device, a pressure detection unit that detects a water pressure inside the pump, and the pressure detection unit Variable means for steplessly changing the pump motor based on the detected water pressure, the water pressure inside the pump decreases as the opening of the discharge port increases by the lever, and the water pressure decreases. Detected by the pressure detecting means, the variable means increases the rotation speed of the motor, and the water pressure inside the pump increases as the closing degree of the discharge port increases by the lever. Detecting an increase in pressure in the pressure detecting means, said changing means lowers the rotation speed of the motor, the discharge port is a high pressure washer, characterized in that stops the motor to become fully closed.
[0008]
According to a second aspect of the present invention, the pressure detecting means is provided in the flowing water passage of the high-pressure water, and a detection valve in which a piston portion strokes according to the water pressure inside the flowing water passage, and a switch to the piston portion of the valve. The high pressure washer according to claim 1, further comprising a variable pressure detection switch having a portion connected thereto.
[0009]
The invention according to claim 3 is the high-pressure washing machine according to claim 2, wherein the detection valve of the pressure detecting means also serves as a relief valve for reducing the water pressure inside the flow channel when the discharge port is closed. is there.
[0010]
[Operation]
The high pressure washer according to claim 1 will be described.
[0011]
The operator operates the lever with the discharge device, and the greater the opening of the discharge port, the lower the water pressure inside the pump, and this pressure drop is detected by the pressure detection means. By increasing the rotational speed, the descending water pressure is increased again.
[0012]
Also, when the operator increases the closing degree of the discharge port with the lever, the water pressure inside the pump rises, the increase in the water pressure is detected by the pressure detection means, and the variable means rises by lowering the rotation speed of the motor. Reduce water pressure. Further, when the discharge port is fully closed by the operation of the lever, the motor is stopped.
[0013]
The pressure detection means in the high-pressure washing machine according to claim 2 is provided in the flow path of the high-pressure water, the detection valve in which the piston portion strokes according to the water pressure in the flow path, and the switch portion in the piston portion. Since the variable pressure detection switch is connected, the water pressure of the high-pressure water can be reliably detected.
[0014]
In the high-pressure washing machine according to the third aspect, since the detection valve and the relief valve are also used, the structure is simplified.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a high pressure washer 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
[0016]
This high-pressure washing machine 10 is used for making water supplied from tap water into a high pressure and washing cars, shutters, block fences, entrances, watering lawns, trees and the like.
[0017]
(1) Overall Structure of the High Pressure Washer 10 First, the overall structure of the high pressure washer 10 will be described with reference to FIG.
[0018]
The high-pressure washing machine 10 includes a washing machine body 12 and a pistol-type discharge device 14, and the washing machine body 12 and the discharge device 14 are connected by a high-pressure hose 16.
[0019]
The washing machine body 12 is provided with a suction port 18 for feeding domestic tap water, and the water supplied from the suction port 18 is made high pressure by a pump 20 inside the washing machine body 12, and the high pressure hose 16 is connected. To the discharge device 14.
[0020]
(2) Structure of the discharge device 14 The structure of the discharge device 14 will be described with reference to FIG.
[0021]
As described above, the discharge device 14 is a pistol type, and is provided with a nozzle 22 at the tip thereof and a grip 24 for an operator to hold the discharge device 14. A lever 26 for adjusting the pressure of water to be sprayed is provided at the front portion of the grip 24.
[0022]
By operating the lever 26, the stroke changes, and the opening / closing member that adjusts the opening / closing degree of the nozzle 22 outlet can be adjusted in response to the change in the stroke. That is, when the lever 26 is stroked to the grip 24 side, the opening / closing member of the discharge port of the nozzle 22 moves in the opening direction, and when the lever 26 is stroked in the direction opposite to the grip 24 side, the discharge port of the nozzle 22 is closed. The opening / closing member operates in the direction.
[0023]
(3) Structure of Pump 20 Next, the structure of the pump 20 will be described with reference to FIGS.
[0024]
A transmission gear 32 is connected to a rotation shaft 30 of a motor 28 provided in the pump 20, and a drive shaft 34 is rotated at a predetermined rotation speed by the transmission gear 32. A swash plate cam 36 is provided at the tip of the drive shaft 34. The piston 38 is brought into contact with the swash plate cam 36 and the swash plate cam 36 rotates, whereby the rotational motion of the motor 28 can be changed to the reciprocating motion by the piston 38.
[0025]
In the lower part of the pump chamber 40, the tip of the piston 38 reciprocates to advance and exit, thereby changing the pressure in the pump chamber 40. In the central portion of the pump chamber 40, a water absorption path 42 that opens to the water inlet 18 is opened. In the upper part of the pump chamber 40, a discharge path 44 leading to the discharge port of the pump 20 is opened. A water absorption valve 46 is attached between the pump chamber 40 and the water absorption path 42, and a discharge valve 48 is opened between the discharge path 44 and the pump chamber 40.
[0026]
As shown in FIG. 3, a decompression path 50 is provided between the discharge path 44 and the water absorption path 42, and a relief valve 52 is provided on the discharge path 44 side of the decompression path 50.
[0027]
A switch portion of a variable pressure switch 56 is connected to the piston portion 54 of the relief valve 52.
[0028]
(4) Configuration of Motor 28 Drive Circuit 58 Next, the motor 28 drive circuit 58 will be described with reference to FIG.
[0029]
The motor 28 is a series motor, and the stator 60 and the amateur 62 are connected by a pair of brushes 64 and 66. A coil L1 and a coil L2 of the stator 60 are connected in parallel to the brush 64, and one of the power switches 68 is connected to the coils L1 and L2 connected in parallel. The power switch 68 is connected to an AC power supply (100 V).
[0030]
The brush 66 is connected to one end of the variable pressure switch 56 described above, and the other end of the variable pressure switch 56 is connected to the other of the power switch 68.
[0031]
(5) Operational state of pump 20 The operational state of the pump 20 will be described.
[0032]
When the power switch 68 is turned on and the motor 28 rotates, the rotary shaft 30 and the drive shaft 34 rotate, and the swash plate cam 36 also rotates. Then, the piston 38 starts reciprocating motion.
[0033]
On the other hand, domestic tap water is supplied from the suction port 18 and sent to the pump chamber 40 via the water absorption valve 46. In this case, since the water pressure on the water absorption path 42 side is higher than the water pressure in the pump chamber 40, the water absorption valve 46 is opened and water enters the pump chamber 40. When the pump 38 reciprocates and enters the pump chamber 40, the pressure in the pump chamber 40 increases due to the advance, and the water absorption valve 46 is closed. On the other hand, the discharge valve 48 is opened because the pressure inside the pump chamber 40 has increased, and high-pressure water with increased water pressure is sent to the discharge passage 44 and sent to the discharge device 14 through the high-pressure hose 16.
[0034]
When the piston 38 moves backward, the pressure inside the pump chamber 40 decreases, the discharge valve 48 closes, the water absorption valve 46 opens, water is supplied again to the pump chamber 40, and the same operation as described above is repeated.
[0035]
The high-pressure water sent to the discharge device 14 is jetted from the discharge port of the nozzle 22.
[0036]
In this case, the pressure inside the pump 20, that is, the inside of the discharge path 44 changes depending on the opening / closing degree of the discharge port of the nozzle 22. Specifically, when the opening degree of the discharge port is large, the water pressure in the discharge path 44 decreases, and when the opening degree is small (when the closing degree is large), the water pressure in the discharge path 44 increases. Therefore, when the water pressure rises above a predetermined pressure, the relief valve 52 is actuated to return water to the water absorption passage 42 via the pressure reduction passage 50 and lower the water pressure. The pressure when the relief valve 52 is actuated to return water to the decompression path 50 is referred to as the maximum pressure in the following description.
[0037]
(6) Method for adjusting pressure of high-pressure water to be injected High-pressure water is injected as described above. A method for adjusting the pressure of high-pressure water will be described.
[0038]
First, when it is desired to increase the water pressure, when the lever 26 of the discharge device 14 is pulled toward the grip 24, the discharge port of the nozzle 22 is opened according to the stroke of the lever 26 (the opening degree in the open / close state increases) The water pressure in the discharge passage 44 decreases. Then, the piston portion 54 of the relief valve 52 strokes according to the reduced water pressure, and the variable pressure switch 56 operates according to the stroke, thereby increasing the drive current flowing from the AC power source to the armature 62 and the stator 60. As a result, the number of rotations of the motor 28, which is a series motor, increases, the number of reciprocating movements of the piston 38 increases, and the water pressure sent from the pump chamber 40 to the discharge passage 44 increases. And the hydraulic pressure of the high-pressure water sprayed from the nozzle 22 increases as intended by the operator.
[0039]
On the other hand, when the lever 26 is stroked in the direction opposite to the grip 24 side, that is, in the direction in which the lever 26 is loosened, the opening degree of the discharge port of the discharge device 14 is reduced (closeness is increased), and the water pressure in the discharge passage 44 is increased. To rise. Then, the piston 54 of the relief valve 52 operates according to the water pressure, and the variable pressure switch 56 also operates. Then, the drive current flowing through the stator 60 and the armature 62 decreases according to the degree of variability of the variable pressure switch 56, the rotational speed of the motor 28 decreases, and the water pressure in the discharge passage 44 decreases.
[0040]
When the discharge port is fully closed and the maximum pressure described above continues, the variable pressure switch 56 detects this and stops the motor 28.
[0041]
(7) Effects of the present embodiment As described above, in the high pressure washer 10 of the present embodiment, the water pressure of the high pressure water to be injected can be adjusted only by adjusting the lever 26 of the discharge device 14. .
[0042]
Further, in the configuration of the discharge device 14, it is only necessary to have a structure that opens and closes the discharge port according to the stroke of the lever 26, so that the structure becomes simple.
[0043]
(8) Modification Examples The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0044]
In the above embodiment, a series motor is used as the motor 28, but other motors that can vary the number of rotations may be used. For example, a brushless DC motor or the like.
[0045]
【The invention's effect】
As described above, in the high pressure washer of the present invention, the water pressure of the high pressure water sprayed from the nozzle can be easily changed by operating the lever of the discharge device.
[Brief description of the drawings]
FIG. 1 is a perspective view of a high-pressure washing machine showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a pump.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a block diagram of a pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 High pressure washer 12 Washing machine main body 14 Discharge device 16 High pressure hose 18 Suction port 20 Pump 22 Nozzle 24 Grip 26 Lever 28 Motor 40 Pump chamber 42 Water absorption path 44 Discharge path 52 Relief valve 56 Variable pressure switch

Claims (3)

A discharge device having a nozzle for discharging high-pressure water;
In a high-pressure washing machine having a washing machine body that compresses supplied water by a pump and sends high-pressure water to the discharge device via a hose,
A discharge port adjusting means for adjusting a degree of opening and closing of the discharge port of the nozzle by adjusting a lever provided in the discharge device;
Pressure detecting means for detecting the water pressure inside the pump;
Variable means for steplessly changing the pump motor based on the water pressure detected by the pressure detection means;
As the opening of the discharge port increases by the lever, the water pressure inside the pump decreases, the decrease in the water pressure is detected by the pressure detection means, and the variable means increases the rotation speed of the motor,
The greater the closing degree of the discharge port by the lever, the higher the water pressure inside the pump. The increase in the water pressure is detected by the pressure detecting means, and the variable means decreases the rotational speed of the motor, and the discharge A high pressure washer that stops the motor when the outlet is fully closed. The pressure detecting means includes
A detection valve provided in the flow path of the high-pressure water, and a piston portion strokes corresponding to the water pressure inside the flow path;
A variable pressure detection switch in which a switch part is connected to the piston part of the valve;
The high-pressure washer according to claim 1. The detection valve of the pressure detection means is
3. The high pressure washer according to claim 2, which also serves as a relief valve for reducing the water pressure inside the flowing water channel when the discharge port is closed.

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