JP2012217978A - High-pressure washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To put the lower limit of a controllable range in the delivery pressure of a high-pressure water at a lower setting.SOLUTION: This high-pressure washer 10 includes: a washer body 11 that generates a high-pressure water by driving a pump 41 by a driving source 32 and pressurizing a supplied water by pump 41; a delivery apparatus 21 that is connected through the washer body 11 and a hose and delivers the high-pressure water sent from the washer body 11; a setting section 15 that sets a revolution speed of the driving source 32; and controlling sections 35, 36 that perform drive-control on the driving source 32 to aim at the revolution speed set by the setting section 15. Then, the controlling sections 35, 36 obtain the revolution speeds at a detecting section 35 of revolution speed that detects the revolution speed of the driving source 32 and the revolution speed of the driving source 32 detected by the detecting section 35 of revolution speed, and has a control circuit 36 that transmits a drive controlling signal to the driving source 32 to allow the driving source 32 to keep the revolution speed set by the setting section 15.

Description

  The present invention relates to a high-pressure washing machine, and more particularly to a high-pressure washing machine that adjusts the discharge pressure of high-pressure water discharged by controlling a drive source.

  2. Description of the Related Art Conventionally, there is known a high pressure washer that can remove dirt stuck to a floor, a wall, or concrete by spraying water with a strong pressure. A general high pressure washer has a pump and a drive source (motor, engine, etc.) in the main body of the washer, and the water supplied from the water suction port is pressurized by a pump driven by the drive source and is high pressure. The high-pressure water was discharged through a discharge port and a discharge device (nozzle gun or the like).

  In such a conventional high pressure washer, as a method for adjusting the pressure of the discharged high pressure water, (1) the output of the drive source is kept constant, and a pressure adjusting unit is provided in the discharge device (nozzle gun, etc.) and the discharge path of the high pressure water. There are those that adjust the pressure of the high-pressure water that is provided and discharge, and (2) those that adjust the pressure of the high-pressure water discharged by adjusting the output of the drive source.

  As a prior art document disclosing the method (1), for example, the following Patent Document 1 exists, and as a prior art document disclosing the method (2), for example, the following Patent Document 2 exists. Yes.

JP-A-10-99800 JP 2005-7366 A

  However, the method of (1) represented by the above-mentioned Patent Document 1 operates a motor, an engine, or the like that is a drive source at a constant output regardless of the discharge pressure of high-pressure water. Therefore, the use efficiency of electric power and fuel is poor, and there is still room for noise reduction. Moreover, since the technique disclosed in Patent Document 1 is to depressurize the high-pressure water sent from the main body of the washing machine by the pressure adjusting unit, the load applied to the pressure adjusting unit is large, and also from the viewpoint of the life of the apparatus. It has a disadvantage.

  On the other hand, the technique described in Patent Document 2 is proposed in order to enable the discharge pressure adjustment on the low pressure side, which is impossible with the method (1). And the technique of patent document 2 uses the variable pressure switch which opens and closes according to the stroke of the lever which a discharge device has, and operates by the adjustment of the water pressure generated at the time of opening and closing of a discharge port, The high pressure washer was turned on / off. However, in the case of the technique described in Patent Document 2, when the discharge pressure is lowered by suppressing the rotation speed of the motor that is the drive source, when the discharge port is closed by the operation of the lever, the load on the pump is reduced. The increase in speed causes a decrease in the number of rotations of the motor, and a rise in pressure in the discharge path becomes gradual, which may cause a relief valve installed as a safety device not to operate. If the relief valve does not operate, the pressure in the discharge path will remain high, increasing the possibility of water leakage or damage to the hose or nozzle gun on the discharge side, and to resume operation. There is a possibility that a necessary load for pulling the lever becomes high, and a problem of deteriorating operability may occur. Therefore, the method (2) represented by Patent Document 2 has a problem that the adjustable range of the discharge pressure of high-pressure water cannot be set lower.

  The present invention has been made in view of the above-described problems, and its purpose is to set the lower limit of the adjustable range of the discharge pressure of high-pressure water lower than that of a conventional high-pressure washing machine. It is possible to provide a new high-pressure washing machine that is possible, has high power / fuel use efficiency, and achieves low noise and long life.

  The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis writing, However, This invention is not limited to the form of illustration by it.

  The high-pressure washing machine (10) according to the present invention is a washing machine main body (11) that generates a high-pressure water by driving a pump (41) with a drive source (32) and pressurizing supplied water with the pump (41). ), A discharge device (21) connected to the cleaning machine main body (11) via a hose and discharging high-pressure water sent from the cleaning machine main body (11), and rotation of the drive source (32) A setting unit (15) for setting the number, and a control unit (35, 36) for performing drive control of the drive source (32) so as to have the rotation speed set by the setting unit (15), The high-pressure washing machine (10) changes the discharge pressure of the high-pressure water according to the rotational speed of the drive source (32), and the controller (35, 36) is configured to rotate the rotational speed of the drive source (32). Is detected by the rotation speed detector (35) and the rotation speed detector (35). In addition, the rotational speed of the drive source (32) is acquired, and the drive source (32) is controlled so that the rotational speed set by the setting unit (15) is maintained by the drive source (32). And a control circuit (36) for transmitting a signal.

  In the high-pressure washing machine (10) according to the present invention, the discharge device (21) is provided with an opening / closing mechanism for opening and closing a path through which high-pressure water is discharged, and the washing machine body (11) A pressure switch (51) that is turned on when the mechanism is opened and turned off when the opening / closing mechanism is closed can be provided.

  In the high-pressure washing machine (10) according to the present invention, the pressure switch (51) includes a switch button (52) for switching on / off of the drive source (32) and the switch button (52). And a pressure driver (53) configured to turn on the switch button (52) by being separated and to turn off the switch button (52) by pressing the switch button (52). Can do.

  According to the present invention, the lower limit of the adjustable range of the discharge pressure of high-pressure water can be set lower than that of a conventional high-pressure washing machine, and the use efficiency of electric power and fuel is high, and it is quiet and long. It is possible to provide a new high-pressure washer that has a long service life.

It is an external appearance front view for demonstrating the whole high-pressure washing machine structure concerning this embodiment. It is an external appearance rear view for explaining the whole high-pressure washing machine composition concerning this embodiment. It is an external appearance left view for demonstrating the whole structure of the high pressure washing machine which concerns on this embodiment. It is a figure which shows the AA cross section in FIG. It is a rear view of the pressurization unit concerning this embodiment. It is a right view of the pressurization unit concerning this embodiment. It is a figure which shows the BB cross section in FIG. It is a figure which shows CC cross section in FIG. It is a figure which shows the DD cross section in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  1 to 3 are external views for explaining the overall configuration of the high-pressure washing machine according to the present embodiment. FIG. 1 is a front view, FIG. 2 is a rear view, and FIG. 3 is a left side view. ing. FIG. 4 is a view showing an AA cross section in FIG.

  The high pressure washer 10 according to the present embodiment is configured to include a washer main body 11 and a discharge device 21. The washing machine main body 11 has a handle 12 on the upper side and two tires 13 and 13 on the lower side. When the operator pushes the handle 12 to the back side with the handle 12 being slightly inclined, The two tires 13 and 13 are rotated so that the washing machine body 11 can be smoothly moved toward the front side.

  A main switch 14 for turning on / off the high-pressure washing machine 10 is installed on the front side of the washing machine main body 11. A variable pressure dial 15 is provided below the main switch 14. is set up. The variable pressure dial 15 constitutes a setting unit of the present invention. The main switch 14 is configured as a rotary knob that can be rotated within an arbitrarily set angle range, and is moved to either one of two positions, on and off, so that a motor 32 as a drive source, which will be described later, is moved. The power can be turned on / off. On the other hand, the variable pressure dial 15 is also configured as a rotary knob that can rotate in an arbitrary angle range, and by changing the position of the variable pressure dial 15, the number of rotations of a motor 32 as a drive source to be described later. The pressure of the high-pressure water discharged can be set. Note that the variable pressure dial 15 of the present embodiment can set pressures in multiple stages. The number of pressure settings, the set pressure value, etc., are the specifications, applications, and manufacturing costs of the high-pressure washing machine. It is possible to set arbitrarily according to the above.

  Further, a water suction port 16 and a water discharge port 17 are provided at a lower position on the front side of the washing machine body 11. The water suction port 16 is connected to a faucet or the like provided in a water pipe, a water storage tank, or the like via a hose (not shown), thereby taking in a role of taking water into the cleaning machine main body 11. On the other hand, the water discharge port 17 is a portion for discharging high-pressure water pressurized inside the cleaning machine main body 11 (a “pressurizing unit 31” described later) from the cleaning machine main body 11. The water discharge port 17 is connected to the discharge device 21 via a hose (not shown).

  The discharge device 21 according to the present embodiment is a member configured by combining a gun 22 and a nozzle 23. As shown in FIG. 3, the gun 22 and the nozzle 23 are separated from each other in the washing machine body 11. It can be stored in a storage cover 18 formed on the left side surface. The gun 22 and the nozzle 23 can be joined by connecting connecting portions formed respectively at the front end portion of the gun 22 and the rear end portion of the nozzle 23.

  Further, the gun 22 is formed with a water inlet 22a for connection to the water outlet 17 via a hose (not shown). Further, in the gun 22, high-pressure water is supplied from the water inlet 22a to the nozzle 23. An open / close mechanism (not shown) is provided in the water guide path of the high-pressure water that guides the water. This opening / closing mechanism can be operated by operating a trigger lever 22b installed on the gun 22. When the trigger lever 22b is pulled, the water guide path of the discharge device 21 is opened, and the trigger lever 22b is released to return to the original state. When it returns, it is comprised so that the water conveyance path of the discharge apparatus 21 may be closed. Therefore, when high-pressure water is sent from the washing machine body 11 to the discharge device 21 through the water inlet 22a, the high-pressure water stays inside the gun 22 by an opening / closing mechanism (not shown) formed inside the gun 22 once. When the operator pulls the trigger lever 22b from this state, an opening / closing mechanism (not shown) is operated to open the water guide path inside the gun 22, and high pressure water is guided to the nozzle 23, and high pressure is supplied from the tip of the nozzle 23. Water will be discharged. When the operator releases the trigger lever 22b from this state, the opening / closing mechanism (not shown) is operated, the water guide path inside the gun 22 is closed, and the discharge of high-pressure water from the tip of the nozzle 23 is stopped.

  As mentioned above, although schematic structure of the high pressure washer 10 concerning this embodiment was explained, in the high pressure washer 10 concerning this embodiment, it pressurizes the water introduced from water intake 16 and generates high pressure water. As a mechanism, a pressurizing unit 31 is installed inside the washing machine body 11. Then, next, the pressurization unit 31 which is a high pressure water generation mechanism is demonstrated in addition to a reference drawing with FIGS.

  Here, FIG. 5 is a rear view of the pressure unit according to the present embodiment, and FIG. 6 is a right side view of the pressure unit according to the present embodiment. 7 is a view showing a BB cross section in FIG. 5, FIG. 8 is a view showing a CC cross section in FIG. 6, and FIG. 9 is a DD cross section in FIG. FIG.

  As shown in detail in FIG. 7, the pressurizing unit 31 according to the present embodiment includes a motor storage portion 31 a that stores a motor 32 that is a drive source, and a pump storage that stores a pump 41 driven by the motor 32. It is comprised by the part 31b.

  The motor 32 housed in the motor housing portion 31a has a motor shaft 33 that is arranged so that the axis is oriented in a substantially vertical direction. The vicinity of both shaft ends of the motor shaft 33 is supported by bearings 33b and 33c so that the motor shaft 33 can rotate around the shaft. Further, a cooling fan 34 is installed at the shaft end portion above the motor shaft 33 for heat dissipation. The motor 32 serves as a heating element during driving, but the cooling fan 34 rotates in accordance with the rotational motion of the motor shaft 33 to generate cooling air, so that the heat of the motor 32 is suitably released by this cooling air. Thus, the heat effect on the motor 32 is removed.

  Further, in the vicinity of the installation position of the cooling fan 34, a sensor 35 as a rotation speed detection unit is installed in order to detect the rotation speed of the motor shaft 33 of the motor 32. Since the sensor 35 is electrically connected to a control circuit 36 installed for the motor storage portion 31 a that stores the motor 32, the rotational speed of the motor shaft 33 detected by the sensor 35 is transmitted to the control circuit 36. It is supposed to be sent by electricity. The control circuit 36 that has acquired the rotational speed of the motor shaft 33 by the sensor 35 sends a drive control signal to the motor 32 so that the motor shaft 33 is rotationally driven at the rotational speed set by the variable pressure dial 15 as a setting unit. It transmits and performs drive control of the motor 32. That is, the sensor 35 and the control circuit 36 are configured to function as a control unit that performs drive control of the motor 32 that is a drive source, and have a rotational speed set by the variable pressure dial 15 that is a setting unit. In addition, the sensor 35 serving as the control unit and the control circuit 36 are configured to cooperate to perform feedback control. Therefore, the high pressure washer 10 of the present embodiment can be operated in accordance with the condition values preset by the operator, and therefore has a configuration with very high power / fuel usage efficiency. it can. In addition, since the high pressure washer 10 of the present embodiment changes the discharge pressure of high pressure water according to the rotation speed of the motor 32, for example, when water is discharged at a low pressure, the motor 32 is operated at a low rotation speed. can do. Therefore, since the motor 32 is not caused to perform unnecessary driving, it is excellent in terms of noise reduction and longer life compared to the conventional technology.

  Further, a small gear 33 a is installed at a shaft end portion below the motor shaft 33. The small gear 33 a meshes with a large gear 42 a installed in the pump housing portion 31 b, so that the rotational driving force generated by the motor 32 can be transmitted to the pump 41.

  On the other hand, the pump 41 housed in the pump housing portion 31b has a large gear 42a at the upper end portion and a drive shaft 45 pivotally supported in the pump housing portion 31b via bearings 43 and 44. Configured. Accordingly, the rotational driving force generated by the motor 32 is transmitted to the drive shaft 45 after being decelerated by the action of the small gear 33a and the large gear 42a, thereby causing the drive shaft 45 to rotate around the shaft. ing.

  A swash plate 46 having an inclined surface on the lower surface side is installed at a shaft end portion below the drive shaft 45, and a thrust bearing 46a is embedded in the inclined surface on the lower surface side of the swash plate 46. It is installed (see FIGS. 7 and 8).

  Further, on the further lower side of the swash plate 46 in which the thrust bearing 46a is embedded, three pistons 47 that reciprocate in a substantially vertical direction are separated from the swash plate 46, and the thrust bearing 46a. It is installed in a state that can be contacted. For the three pistons 47, a spring 47a is installed between the inner surface of the pump housing portion 31b, and an elastic force is always applied in a direction protruding upward by the action of the spring 47a. When a downward force against the elastic force is applied, the piston 47 is configured to move downward. That is, each of the three pistons 47 is configured to be capable of reciprocating piston movement in the vertical direction.

  The pump inner region α where the thrust bearing 46a embedded in the swash plate 46 and the three pistons 47 are in contact with each other is filled with lubricating oil, and a good contact state between the thrust bearing 46a and the three pistons 47 is obtained. It is configured to be realized. Therefore, when the motor 32 is driven and the motor shaft 33 is rotationally driven, this rotational driving force is transmitted to the drive shaft 45 via the small gear 33a and the large gear 42a, and the swash plate 46 is rotationally driven. However, when the swash plate 46 is driven to rotate, the thrust bearing 46a is rotated by the action of the inclined surface formed on the lower surface side of the swash plate 46, so that the three pistons 47 are driven by the thrust bearing 46a. Are sequentially pushed downward and the downward push is released, so that the three pistons 47 sequentially perform reciprocating piston movement.

  A water suction port 16 is connected to the lower side of the pump housing portion 31 b, and water sent through the water suction port 16 is guided to a position below the installation location of the three pistons 47. The water guided to the position below the installation location of the three pistons 47 is pressurized by the action of the reciprocating piston movement by the pistons 47 to generate high-pressure water.

  The high-pressure water generated as described above is sent to the water discharge port 17 connected to the pump housing part 31b. A water absorption path γ (see FIG. 7) from the water inlet 16 to the front of the piston 47 and a water discharge path β from the location where the high pressure water is generated by the three pistons 47 of the pump 41 to the water outlet 17 (FIG. 8). And the pressure of water existing inside the pump 41 during operation is different from that of the pump 41, and in particular, it is necessary to prevent the pressurized high-pressure water existing in the water discharge path β from leaking into the water absorption path γ. There is. Therefore, in the present embodiment, as shown in FIG. 9, the check valve 48 corresponds to each of the three pistons 47 in the vicinity of the downstream side where the high pressure water is generated by the three pistons 47. Is installed. By the action of the check valve 48, the high-pressure water generated by being pressurized by the pump 41 is configured to be reliably sent to the spout 17 side without losing pressure.

  Now, as shown in detail in FIG. 9, a pressure switch 51 and a relief valve 61 are installed in the pressurizing unit 31 according to the present embodiment as a mechanism for suitably discharging the high-pressure water generated by the pump 41. ing. Therefore, next, the configuration of the pressure switch 51 and the relief valve 61 according to the present embodiment will be described with reference to FIG.

  The pressure switch 51 is a member installed in the water discharge path β from the location where the high pressure water is generated by the three pistons 47 of the pump 41 to the water discharge port 17, and turns on / off the motor 32 that is a drive source. A switch button 52 for switching, and a pressure driver 53 that switches the switch button 52 by being in a contact / non-contact state with respect to the switch button 52 are configured.

  The switch button 52 is configured to be turned on when the pressure driver 53 is separated and brought into a non-contact state, and to be turned off when the pressure driver 53 is brought into contact and the switch button 52 is pressed. . The switch button 52 is configured as a lower switch that functions when the main switch 14 is on, and can be operated only when the main switch 14 is on.

  The pressure driving body 53 has a shape similar to a golf tee in its outer shape, and an end portion on the side in contact with the switch button 52 is formed in the shaft shape 53a, and on the side not in contact with the switch button 52. The end portion is configured as a disk shape 53b connected to the shaft shape 53a. The diameter of the shaft shape 53a is configured to be smaller than the diameter of the disk shape 53b. In addition, a coil spring 54 is installed so as to surround the shaft shape 53a, so that an elastic force can be exerted between the inner wall surface of the pressure switch 51 in which the pressure driver 53 is accommodated and the disk shape 53b. It is configured. Accordingly, the pressure driver 53 is configured to be always located at a location away from the switch button 52 by receiving the elastic force of the coil spring 54.

  To the pressure switch 51 configured as described above, two branch paths (a first branch path β1 and a second branch path β2) branched from the high-pressure water discharge path β are connected. The connection relationship between the two branch paths β1 and β2 and the pressure switch 51 is that the first branch path β1 of the two branch paths β1 and β2 is connected to the position where the shaft shape 53a is formed. The path β2 is connected to the end portion side of the pressure driver 53 on the side where the disk shape 53b is formed. That is, each of the two branch paths β1 and β2 is connected to the pressure switch 51 so as to sandwich the disk shape 53b.

  As for the connection relationship between the two branch paths β1 and β2 and the water discharge path β, the first branch path β1 is connected to the water discharge path β having a normal diameter among the two branch paths β1 and β2. The second branch path β2 is connected to the throttle pipe 58 formed in the water discharge path β. When high-pressure water passes through the water discharge path β, high-pressure water is always introduced into the two branch paths β1 and β2, and the second branch is caused by the venturi effect obtained by the throttle pipe 58. The pressure of the path β2 is configured to be lower than the pressure of the first branch path β1.

  Accordingly, when high-pressure water is not introduced from the two branch paths β1 and β2, the pressure driver 53 is separated from the switch button 52 by the elastic force of the coil spring 54.

  On the other hand, when high-pressure water is introduced from the two branch paths β1 and β2, the operation state of the pressure switch 51 becomes three states described below. That is, the first state is a case where the pressure of high-pressure water entering from the two branch paths β1 and β2 is low. In this case, the disk shape on the side where high-pressure water is introduced from the second branch path β2 The area of the end surface of 53b is larger by the axial shape 53a than the area of the end surface of the disk shape 53b on the side where high-pressure water is introduced from the first branch path β1, so that the pressure driver 53 is affected by the effect of the area difference. However, since the moving force acts in the direction of the switch button 52, the elastic force of the coil spring 54 is superior to this moving force, so that the pressure driver 53 is separated from the switch button 52 (ON state). Next, the second state is a case where the pressure of the high-pressure water entering from the two branch paths β1 and β2 rises and the high-pressure water is flowing in the water discharge path β. Since the pressure of the high-pressure water introduced from the second branch path β2 is lower than the pressure of the high-pressure water introduced from the first branch path β1 due to the venturi effect obtained by the throttle pipe 58, the movement due to the above-described area difference effect. Since the force is weak and the elastic force of the coil spring 54 is superior to the moving force, the pressure driver 53 is separated from the switch button 52 (on state). Further, the third state is a case where the pressure of the high-pressure water entering from the two branch paths β1, β2 is increased and no high-pressure water is flowing in the water discharge path β. In this case, The pressure of the high-pressure water introduced from the first branch path β1 is equal to the pressure of the high-pressure water introduced from the second branch path β2, and as a result, the moving force due to the effect of the area difference described above becomes the elastic force of the coil spring 54. Since it wins, the pressure driver 53 will be in the state (OFF state) which contacted the switch button 52. FIG.

  For example, when the trigger lever 22b installed in the gun 22 is pulled to open an opening / closing mechanism (not shown) and the water guide path of the discharge device 21 is opened, the pressure of the water in the water discharge path β is reduced. The switch 51 is in the first state (ON state), and the pump 41 starts operation. When the operation of the pump 41 is started, high pressure water is discharged from the tip of the nozzle 23 of the discharge device 21, and the pressure of the high pressure water in the water discharge path β rises at the same time. Transition to the state (ON state). Accordingly, the pump 41 continues to operate, and the discharge of high-pressure water from the tip of the nozzle 23 of the discharge device 21 is continued.

  On the other hand, when the trigger lever 22b installed in the gun 22 is released from the above-described operation state and the opening / closing mechanism (not shown) is closed, the water guide path of the discharge device 21 is closed and the water discharge path β is discharged. Since the discharge of the high-pressure water toward the water port 17 is stopped, the high-pressure water pressurized by the pump 41 remains in the water discharge path β and the pressure of the water in the water discharge path β increases. In such a state, there is no pressure difference between the first branch path β1 and the second branch path β2 due to the action of the throttle pipe 58, and the pressure switch 51 has the same pressure via the two branch paths β1 and β2. High pressure water will be introduced. Note that the pressure of the high-pressure water at this time is much higher than the pressure of water in the water discharge path β in the above-described operation state. When high-pressure water having the same pressure is introduced into the pressure switch 51 via the two branch paths β1 and β2, the pressure driver 53 causes the switch button 52 to move from the area difference effect of the disk shape 53b in the pressure driver 53. Since the switch button 52 is pushed, the pressure switch 51 enters the third state (off state), and commands the motor 32 to stop operating. As described above, when the operator releases the trigger lever 22b, the pressure switch 51 is activated and the motor 32 is stopped. Thus, the operation stop state of the high pressure washer 10 is realized.

  Furthermore, along with the operation of the pressure switch 51, the relief valve 61 installed in the water discharge path β from the location where the high pressure water is generated by the three pistons 47 of the pump 41 to the water discharge port 17 is operated, whereby the water discharge path The pressure increase state (abnormal pressure increase state) in β and in the discharge device 21 can be eliminated. The relief valve 61 has a conventionally known mechanism, and is configured to operate when the pressure of the high-pressure water existing in the water discharge path β suddenly increases to 9 MPa or more, and exerts a function of releasing the pressure. Has been. When the pressure is released by the relief valve 61, the water discharge path β is opened at the location where the relief valve 61 is installed, so that a slight amount of water is released, but the outlet side of the relief valve 61 is The water absorption path γ from the water absorption port 16 to the front of the piston 47 is connected. Therefore, even if water is released by the operation of the relief valve 61, the discharged water is returned to the water absorption path γ into which water before pressurization is introduced and reused, so that water resources are wasted. It is designed not to be used.

  In the high pressure washer 10 according to the present embodiment, a detergent bottle 71 is installed near the lower side of the handle 12 on the back side of the washer body 11. As one method of using the detergent bottle 71, the gun 22 of the discharge device 21 and the detergent bottle 71 are connected by a hose, and the detergent is guided simultaneously with the discharge of the high-pressure water, thereby discharging the high-pressure water containing the detergent. There is a way. As another method of using the detergent bottle 71, the pressure switch 51 and the detergent bottle 71 are connected by a hose, so that the detergent is supplied to the high-pressure water in the drive region of the pressure driver 53 included in the pressure switch 51. There is also a method of using it as a supply path for this purpose. The reason why the detergent can be introduced into the drive region of the pressure driver 53 of the pressure switch 51 is due to the action of the throttle pipe 58. That is, when high-pressure water is discharged, the pressure of the second branch path β2 is lower than the pressure of the first branch path β1 due to the venturi effect obtained by the throttle pipe 58. In addition, high-pressure water is always introduced into the two branch paths β1 and β2. Therefore, the detergent introduced to the drive region of the pressure driver 53 is guided to the second branch path β2 having a low pressure, guided to the throttle pipe 58, and mixed with the high-pressure water to be discharged. 17 is discharged. In this manner, by introducing the detergent into the water discharge path β from the storage location of the pressure driver 53 via the second branch path β2, it becomes possible to discharge the high-pressure water containing the detergent.

  The specific configuration of the high pressure washer 10 according to the present embodiment has been described above. Next, the operation procedure and operation of the high pressure washer 10 according to the present embodiment will be described in detail.

  First, a hose connected to a water tap is attached to the water inlet 16 of the high pressure washer 10 according to the present embodiment. Further, the gun 22 and the nozzle 23 are taken out from the storage cover 18, the gun 22 and the nozzle 23 are combined, and the discharge device 11 is assembled. And the water inlet 22a of the assembled discharge apparatus 11 and the water discharge port 17 of the high-pressure washing machine 10 are connected with a hose, and the initial preparation of the high-pressure washing machine 10 is completed.

  When the operation of the high-pressure washing machine 10 is suddenly started from this state, the pump 41 is operated in a state where air is bitten. Next, a water intake operation for filling the pump 41 with water is performed. Specifically, when the trigger lever 22b installed in the gun 22 is pulled to open the water faucet connected to the water inlet 16 of the high pressure washer 10 in a state where the water guide path of the discharge device 21 is opened, Since tap water has a water pressure of about 0.5 MPa, water is taken into the pressurizing unit 31 via the water suction port 16 of the high-pressure washing machine 10 by the water pressure, and the water pressure from the water suction port 16 to the piston 47 is increased. The water absorption path γ up to this side and the water discharge path β from the piston 47 to the water discharge port 17 are filled with water, and water leaks from the tip of the nozzle 23 of the discharge device 21. At this point, the inside of the pressure unit 31 is filled with water. After confirming that water leaks from the tip of the nozzle 23, the trigger lever 22b is released to close the water guide path of the discharge device 21, and the water intake operation is completed.

  When the water-receiving work is completed, the main switch 14 is subsequently rotated to move to the ON position, and the high-pressure washing machine 10 is turned on. Before or after the operation of the main switch 14, the variable pressure dial 15 is adjusted and set to a desired number of revolutions, so that the discharge pressure of high pressure water to be discharged is set to a desired condition value. can do.

  When the main switch 14 is turned on, the motor 32 is turned on at that moment, so the motor shaft 33 rotates for a moment, the pump 41 is activated, and the water discharge path β is boosted. However, since the water guide path of the discharge device 21 is closed at this time, the pressurized water in the water discharge path β enters the pressure switch 51 via the two branch paths β1 and β2. On the side of the pressure switch 51 into which the pressurized water has entered from the two branch paths β1 and β2, the pressure driver 53 moves toward the switch button 52 by the effect of the area difference due to the pressure driver 53, and the pressure driver Since the switch button 52 is pushed by 53, the motor 32 is turned off (this off state corresponds to the above third state). Thereby, the operation preparation of the high-pressure washing machine 10 is completed.

  Now, when the operator pulls the trigger lever 22b and opens the water guide path of the discharge device 21 from the state where the above-described operation preparation is completed, the water in the water discharge path β passes through the water discharge port 17 and the nozzle of the discharge device 21. 23, since the discharge starts from the tip, the water pressure in the water discharge path β decreases. When the pressure of water in the water discharge path β decreases and flows out toward the water discharge port 17, the entry of water with pressure into the two branch paths β1 and β2 stops. Then, the pressure driver 53 released from the pressure of the water from the two branch paths β1 and β2 is separated from the switch button 52 by receiving the elastic force of the coil spring 54. When the pressing of the switch button 52 by the pressure driver 53 is released, the motor 32 is turned on, so that the motor shaft 33 is rotated and the operation of the pump 41 is started. Is started (at this time, the first state is realized). Thereafter, the water pressure in the water discharge path β increases as the pump 41 is operated. However, the two branch paths β1 and β2 into which high-pressure water is constantly introduced are obtained by the throttle pipe 58. Since the pressure of the second branch path β2 is lower than the pressure of the first branch path β1 due to the Venturi effect, the pressure driver 53 does not move in the direction of the switch button 52 (this state is This corresponds to the state 2). Therefore, even if the pressure of water in the water discharge path β continues to rise, the pressure switch 51 does not operate, and the high-pressure water discharge operation can be continued.

  The driving state of the motor 32 is a control unit so that the rotation number of the motor shaft 33 is constantly monitored by a sensor 35 as a rotation number detection unit and the rotation number set by the variable pressure dial 15 is maintained. Since the sensor 35 and the control circuit 36 are configured to perform feedback control in cooperation with each other, the rotation speed set in advance is always maintained.

  With this operation, high-pressure water having a pressure set in advance by the variable pressure dial 15 flows through the water discharge path β, and high-pressure water flows from the tip of the nozzle 23 of the discharge device 21 via the water discharge port 17 and the discharge device 21. The discharge is performed at a constant pressure.

  When stopping the discharge of the high-pressure water from the above operating state, the operator may release the trigger lever 22b. When the trigger lever 22b is released, the water guide path of the discharge device 21 is closed and the discharge of the high-pressure water is stopped. When the discharge of the high-pressure water stops, the pump 41 is still driven at this moment, so that the high-pressure water existing in the water discharge path β is boosted in a state where the flow is stopped and stopped. Since the flow is stopped, there is no pressure difference between the first branch path β1 and the second branch path β2 due to the action of the throttle pipe 58, and the pressure switch 51 passes through the two branch paths β1 and β2. Therefore, high-pressure water with the same pressure will be introduced. Due to the introduction of the high-pressure water, the pressure driver 53 moves to the switch button 52 side due to the area difference effect of the disk shape 53b in the pressure driver 53 and presses the switch button 52, and the pressure switch 51 stops the operation of the motor 32. (At this time, the third state is realized). As described above, when the operator releases the trigger lever 22b, the pressure switch 51 is activated and the motor 32 is stopped. Thus, the operation stop state of the high pressure washer 10 is realized.

  When the trigger lever 22b is released and the water guide path of the discharge device 21 is closed and the discharge of the high-pressure water is stopped, the high-pressure water existing in the water discharge path β is boosted in a state where the flow is stopped and stopped. Therefore, the high-pressure water in a state where the pressure increase continues exerts a load on the pump 41 as well. In the case of the high pressure washer of the prior art, when the load is applied to the pump, the rotational speed is reduced and the desired pump output cannot be obtained. Therefore, when the discharge is performed on the low pressure side, the discharge is performed on the high pressure side. As compared with the case where the pressure is increased, the pressure rise (pressure increase) becomes more gradual, and there is a possibility that the relief valve does not operate. However, in the present embodiment, the sensor 35 as the control unit and the control circuit 36 are configured to perform feedback control in cooperation, so even if a load is applied to the pump 41, the motor 32 The number of rotations of the motor shaft 33 is maintained in a preset state. For this reason, the pressure in the water discharge path β suddenly increases to about 9 MPa or more, so that the relief valve 61 does not operate. The situation never happens. Therefore, in the high pressure washer 10 according to the present embodiment, the abnormal pressure increase state does not occur in the water discharge path β and the discharge device 21 and the like, which is possible in the prior art, so that the operation is performed under desired conditions. It is possible and does not damage the equipment.

  When the relief valve 61 is activated, the pressure in the water discharge path β and the discharge device 21 is maintained at about 3.5 MPa, and the high pressure washer 10 is maintained in the state where the above-described operation preparation is completed. Will be.

  In this state, when it is desired to discharge and stop the high-pressure water again, the operation described above is executed by operating the trigger lever 22b of the gun 22, and the discharge and stop of the high-pressure water can be executed. .

  When it is desired to completely stop the operation of the high pressure washer 10, the operation of the high pressure washer 10 is completely stopped by moving the main switch 14 to the off position and turning off the power of the motor 32. Can be made. After the operation of the high-pressure washing machine 10 is stopped, a tap faucet connected to the water inlet 16 is closed, a hose (not shown) is pulled out from the water inlet 16, and a trigger lever 22b installed in the gun 22 To open the water conduit of the discharge device 21. Then, the water present in the pressurizing unit 31 included in the high pressure washer 10 can be discharged from the water outlet 17. In this way, it is preferable in terms of equipment maintenance that the high pressure washer 10 is drained and then the high pressure washer 10 is cleaned.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, in the above-described embodiment, the case where the motor 32 is employed as the drive source has been described as an example. However, any other drive means such as an engine can be employed as the drive source of the present invention.

  In the above-described embodiment, the power supply path to the drive source is omitted, but the power supply and fuel supply means for the drive source according to the present invention is an outlet cable for obtaining power from an external power source, Known electric power / fuel supply means such as a battery as an internal power source or a gasoline tank as an internal fuel can be employed.

  Further, in the above-described embodiment, the case where the pump 41 (so-called triple plunger pump) configured by the swash plate 46 with the thrust bearing 46a and the three pistons 47 is employed has been described as an example. Any known pressurizing mechanism can be employed for the pressurizing means of the present invention.

  Furthermore, the above-described water pressure is merely an example that can be realized in the present embodiment. The high-pressure washing machine according to the present invention can be arbitrarily changed within a range having the configuration described in the claims, and is not limited to the description of the above-described embodiment. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 High pressure washing machine, 11 Washing machine main body, 12 Handle, 13 Tire, 14 Main switch, 15 Variable pressure dial, 16 Water inlet, 17 Water outlet, 18 Storage cover, 21 Discharge device, 22 Gun, 22a Water inlet, 22b Trigger Lever, 23 nozzle, 31 pressure unit, 31a motor housing, 31b pump housing, 32 motor, 33 motor shaft, 33a small gear, 33b, 33c bearing, 34 cooling fan, 35 sensor, 36 control circuit, 41 pump, 42a Large gear, 43, 44 Bearing, 45 Drive shaft, 46 Swash plate, 46a Thrust bearing, 47 Piston, 47a Spring, 48 Check valve, 51 Pressure switch, 52 Switch button, 53 Pressure driver, 53a Shaft shape, 53b Disc shape, 54 coil spring, 58 Restriction pipe, 61 relief valve, 71 detergent bottle, α pump area, β water discharge path, β1 first branch path, β2 second branch path, γ water absorption path.

Claims (3)

A washing machine body that drives a pump with a drive source and pressurizes the supplied water with the pump to generate high-pressure water;
A discharge device connected to the main body of the cleaning machine via a hose and discharging high-pressure water sent from the main body of the cleaning machine;
A setting unit for setting the rotational speed of the drive source;
A control unit that performs drive control of the drive source so as to have the rotation speed set by the setting unit;
With
In the high-pressure washing machine that changes the discharge pressure of the high-pressure water according to the rotational speed of the drive source,
The controller is
A rotational speed detector for detecting the rotational speed of the drive source;
The rotation speed of the drive source detected by the rotation speed detection unit is acquired, and a drive control signal is transmitted to the drive source so that the drive source maintains the rotation speed set by the setting unit. A control circuit;
A high-pressure washing machine characterized by comprising: In the high-pressure washing machine according to claim 1,
The discharge device is provided with an open / close mechanism that opens and closes a path through which high-pressure water is discharged.
The cleaning machine main body includes a pressure switch that is turned on when the opening / closing mechanism is opened and is turned off when the opening / closing mechanism is closed. The high pressure washer according to claim 2,
The pressure switch is
A switch button for switching on / off the drive source;
A pressure driver that turns the switch button on by leaving the switch button, and turns the switch button off by pressing the switch button;
A high-pressure washing machine characterized by comprising

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