JP6899432B2 - Handheld high pressure washer - Google Patents

Description

The present invention relates to a handheld high pressure washer.

Cleaning needs are much more prevalent in home life and outdoor activities.
In a home life centered around the home garden, people always need to clean the balconies, corridors, outdoor tables / chairs, grills, cars, bicycles, garages, pets, garden tools, windows, pools, outdoor stairs, etc. is there. Since these articles are used outdoors, dirt such as mud stains, oil stains, leaves, and dust are inevitably attached, and it is very inconvenient to wash them with a rag, and water flow and thus high pressure. Must be spray washed with a stream of water. To meet the above needs, the market is usually provided with one body, which is usually provided with a water tank, a motor and a pump, and a trigger switch for discharging water, as disclosed in, for example, Chinese Patent CN18402446A. A household high pressure washer with one spray gun is provided. Since these high-pressure washers are large in volume and heavy, they are troublesome to transport when switching work sites. For example, when cleaning windows, driveways, stairs, and automobiles individually on a home cleaning day, it is necessary to repeatedly transport the high pressure washer back and forth between different locations. In addition, it is necessary to fill the water tank with water before using the high pressure washer, and the operation is not easy.

On the other hand, in outdoor activities such as mountaineering, cross-country, cycling, camping, horseback riding, and boating, the environment is closer to nature and the activities are more intense, so the tools and animals involved in the activities are more likely to get dirty and need to be washed in a timely manner. There is. For example, after a car, motorcycle or bicycle travels in a field, it is inevitably smeared with mud, and ships and rafts need to clean up the mud and aquatic plants on the hull after sailing. Horses and users also sweat and get mud, so it's best to take a shower or wash away in a timely manner to avoid physical discomfort. The above-mentioned high-pressure washer has a large volume and is heavy, so that it is not suitable for carrying around in the above-mentioned outdoor activities. Further, since the above-mentioned high-pressure washer uses an AC power source to supply power, it is difficult to find an appropriate power source in outdoor activities. The user always puts up with the dirt during the activity, and when the activity is over, he has to return to the fixed ground to wash it, or pass through the water source during the activity and wipe it easily with a rag, so the cleaning efficiency is low and the effect is low. Bad, the cleaning process is dirty.

As mentioned above, users have a need to clean in various situations and places, but currently commercially available related products are not portable and can only be used in very limited situations and places, and users Can't be washed anytime, anywhere. It can be conveniently and labor-savingly moved in various home cleaning activities to clean balconies, roads, automobiles, etc., and while satisfying the user's household cleaning needs, it can be carried around in activities such as cross-country and cycling, and cleaning needs for outdoor activities. If a product that can meet the requirements can be provided, the user's cleaning work can be greatly simplified, the scope of the cleaning work can be expanded, and the quality of life of the user can be improved.

The main factors that affect the portable function of the high pressure washer are that the volume occupied by the pump in the high pressure washer is large and the pump is heavy. In a typical pump structure, it is driven by a piston and a swash plate, as shown in Chinese patent CN1212899C. Since the swash plate and piston require a large working chamber, such pumps are complex in structure and heavy in weight and volume.

The main factor affecting the outdoor use function of a high pressure washer is that the high pressure washer uses an AC power supply. A high-pressure washer that is powered by AC is limited to power supply, and it is necessary to arrange a corresponding AC power supply in the usage scene, so the convenience of applying it to outdoor scenes is reduced, and power is supplied by AC. The high pressure washer is limited to the length of the power cord, and the cleaning must be performed within the length range of the power cord, which limits the cleaning range and mobility of the high pressure washer.

In view of the above, one object of the present invention is to provide a handheld high pressure washer having a small volume and a light weight so as to improve portability.

In order to achieve the above object, the present invention employs the following technical means.
A housing having a gripping handle, a main body portion provided at an angle with the handle, and a discharge portion for discharging cleaning liquid to the outside, a motor provided in the housing, and a pump driven by the motor. The pump is driven by the motor to convey the cleaning liquid to the outside, and the pump includes a pump body, a plunger housed in the pump body, and the pump. A water supply port and a drain port provided in the pump body and a central chamber are provided, and by moving the plunger, the cleaning liquid flows into the central chamber through the water supply port and flows out from the drain port to the discharge portion. In a handheld high-pressure washing machine in which the transmission mechanism is connected to the plunger and the motor drives the reciprocating movement of the plunger via the transmission mechanism, the number of the plungers is only one. The pump further includes an upper pump cover and a lower pump cover that are detachably attached to the pump body, and the central chamber is formed in the upper cavity formed in the upper pump cover and in the lower pump cover. A hand-held high-pressure washing machine having a lower cavity, wherein both ends of the plunger are driven so as to reciprocate in the upper cavity and the lower cavity, respectively.

In one embodiment, the pump is arranged in the housing so that the length of the functional member in the front-rear direction is 200 mm or less and the upper pump cover is located above the lower pump cover. Has been done.

In one embodiment, the housing has a bisector and a first half housing and a second half housing provided substantially symmetrically with respect to the bisector, extending the length of the plunger. The direction is parallel to the bisector.

In one embodiment, the transmission mechanism comprises an eccentric mechanism connected to the motor, the central portion of the plunger is recessed inward to form a mounting portion, and the eccentric mechanism is connected to the mounting portion. By driving the motor, the plunger is reciprocated in the pump body.

In one embodiment, the opening direction of the drainage port is substantially perpendicular to the reciprocating movement direction of the plunger, and the drainage port is located in front of the plunger.

In one embodiment, the discharge portion has an outlet for the cleaning liquid to flow out, and in the front-rear direction, the drain port is located between the plunger and the outlet, and the opening of the drain port. The direction coincides with the opening direction of the outlet.

In one embodiment, the drain and the water supply are arranged on the same side of the plunger, and in the left-right direction, the axis of the drain is located on the dichotomous surface or dichotomized. The dimension deviated from the surface to the left or right is 30% or less of the width of the pump body.

In one embodiment, the pump has a water supply cavity communicating with the water supply port, a drainage cavity communicating with the drain port, and a cleaning liquid flowing from the water supply cavity into the central chamber in one direction, or the central chamber. A check valve unit that controls the outflow from the water to the drainage cavity in one direction is further provided, and at least the water supply cavity or at least the drainage cavity is located in front of the plunger.

In one embodiment, both the water supply cavity and the drainage cavity are provided in front of the plunger, and the water supply cavity and the drainage cavity are arranged adjacent to each other in the left-right direction.

In one embodiment, the extending direction of the water supply cavity and the drainage cavity is parallel to the reciprocating movement direction of the plunger, and both the drainage port and the water supply port are in front of the water supply cavity and the drainage cavity. The opening directions of the drainage port and the water supply port are perpendicular to the extending direction of the drainage cavity and the water supply cavity.

In one embodiment, the handheld high pressure washer further comprises a battery pack that feeds the motor, the functional member is located at one end of the handle, and the battery pack is located at the other end of the handle. ..

In one embodiment, the functional member is provided in the main body portion, the main body portion extends substantially in the discharge direction of the cleaning liquid, and the center of gravity G of the handheld high-pressure washer is the tip point and the rear end point of the handle. The handle is arranged so that the angle formed by the extending direction of the handle and the extending direction of the main body portion is larger than 90 degrees and not more than 160 degrees so as to be located between them.

In one embodiment, the discharge portion of the handheld high pressure washer is provided with an accessory mounting portion arranged so as to enable a detachable connection with the discharge head, and the discharge head has a predetermined length. A spray bar and a nozzle connected to one end of the spray bar are provided, and the parts before the tip point of the handle are used as a spray gun unit, and the parts after and below the rear end point of the handle are used as a power supply unit. The weight of the gun unit is larger than the weight of the power supply unit.

In view of the above, one object of the present invention is to provide a handheld high pressure washer having a small volume and a light weight so as to improve portability.

In order to achieve the above object, the present invention employs the following technical means.
A housing having a bisected surface and a first half housing and a second half housing provided substantially symmetrically with respect to the bisected surface so as to form an angle with the gripping handle and the handle. A housing having a main body portion provided in the above, a discharge portion for discharging a cleaning liquid to the outside, a motor provided in the housing, a pump driven by the motor, and a functional member having a transmission mechanism. In a handheld high-pressure washer, the pump includes a pump body, a single plunger provided in the pump body, a water supply port and a drain port provided in the pump body, and a central chamber of the plunger. Due to the movement, the cleaning liquid flows into the central chamber through the water supply port and flows out from the drain port to the discharge portion, the transmission mechanism is connected to the plunger, and the plunger extends its length. Driven to move back and forth in the direction,
The housing comprises a pump case that is at least partially covered around the pump so that the pump is such that the ratio of the lateral width of the pump case to the lateral width of the handle is 3 or less. , A hand-held high-pressure washer, characterized in that it is arranged in the housing.

In one embodiment, the pump has an upper pump cover provided at one end of the plunger and a lower pump cover provided at the other end of the plunger, the central chamber being formed within the upper pump cover. It has an upper cavity and a lower cavity formed in the lower pump cover, and the transmission mechanism drives both ends of the plunger to reciprocate in the upper cavity and the lower cavity, respectively, to the left and right. In the direction, both the upper pump cover and the lower pump cover extend so as to straddle the dichotomized surface.

In one embodiment, the pump is arranged in the housing so that the length extension direction of the plunger is parallel to the bisector.

In one embodiment, the pump has a water supply cavity communicating with the water supply port, a drainage cavity communicating with the drain port, and a cleaning liquid flowing in one direction from the water supply cavity to the central chamber, or from the central chamber. A check valve unit that controls the outflow to the drainage cavity in one direction is further provided, and the water supply cavity and the drainage cavity are arranged adjacent to the same side of the plunger.

In one embodiment, the water supply cavity and the drainage cavity penetrate the pump body in the vertical direction, and both the water supply cavity and the drainage cavity are provided in front of the plunger.

In one embodiment, the discharge portion has an outlet for the cleaning liquid to flow out, and in the front-rear direction, the drain port is located between the plunger and the outlet, and the opening of the drain port. The direction coincides with the opening direction of the outlet.

In one embodiment, the drainage port and the water supply port are arranged side by side on the same side of the plunger, and in the left-right direction, the axis of the drainage port is located on the bisector or the bisector. The dimension deviated from the surface to the left or right is 30% or less of the width of the pump body.

In view of the above, one object of the present invention is to provide a handheld high pressure washer having a small volume and a light weight so as to improve portability.

In order to achieve the above object, the present invention employs the following technical means.
A housing having a handle for gripping, a main body portion provided at an angle with the handle, and a discharge portion for discharging cleaning liquid to the outside.
A motor provided in the housing and providing a driving force for the operation of the handheld high pressure washer,
A pump that is driven by the motor to convey the cleaning liquid to the outside, and communicates with the pump body, the plunger housed in the pump body, the water supply port and the drain port provided in the pump body, and the water supply port. It has a water supply cavity, a drainage cavity communicating with the drainage port, and a central chamber. By moving the plunger, the cleaning liquid flows into the central chamber through the water supply port, and the cleaning liquid flows from the drainage port to the central chamber. The pump that flows out to the discharge part and
A transmission mechanism connected to the plunger, wherein the plunger includes a transmission mechanism driven by the motor via the transmission mechanism and a transmission mechanism.
In a handheld high pressure washer comprising a check valve unit that controls unidirectional flow of cleaning liquid from the water supply cavity into the central chamber or unidirectional flow from the central chamber into the drainage cavity.
The check valve unit includes a first drain valve provided in the drain cavity, and the first drain valve includes a valve body, a check valve located inside the valve body, and the check valve. It has a urging member, and the cleaning liquid operably presses the check valve, moves the check valve inside the valve, and the contact surface between the check valve and the valve body and the valve body. A hand-held high-pressure washing machine characterized in that the vertical distance from the uppermost end of the drain port is 20 mm or less.

In one embodiment, the vertical distance between the contact surface between the check valve of the first drain valve and the valve body and the uppermost end of the drain port is 5 mm or less.

In one embodiment, the direction of movement of the check valve of the first drain valve is parallel to the plunger, and in the direction of movement of the check valve, the uppermost end of the drain port is the check valve and the check valve. It is located below the contact surface with the valve body, or at substantially the same height as the contact surface between the check valve and the valve body.

In one embodiment, the pump further comprises a plunger hole for accommodating the plunger, the plunger hole extending in the vertical direction, passing through a position half the length of the plunger hole and in the reciprocating movement direction of the plunger. The vertical surface is the central cross section R in the front-rear direction of the pump, and the lowermost end of the drain port is flush with the central cross section R or is located above the central cross section R in the vertical direction.

In one embodiment, the housing has a bisector and a first half housing and a second half housing provided substantially symmetrically with respect to the bisector, extending the length of the plunger. The direction is parallel to the bisector.

In one embodiment, the pump has an upper pump cover provided at one end of the plunger and a lower pump cover provided at the other end of the plunger, the central chamber being formed within the upper pump cover. It has an upper cavity and a lower cavity formed in the lower pump cover, and the transmission mechanism drives both ends of the plunger to reciprocate in the upper cavity and the lower cavity, respectively, to the left and right. In the direction, both the upper pump cover and the lower pump cover extend so as to straddle the dichotomized surface.

In one embodiment, the discharge portion has an outlet for the cleaning liquid to flow out, and in the front-rear direction, the drain port is located between the plunger and the outlet, and the opening of the drain port. The direction coincides with the opening direction of the outlet.

In one embodiment, both the water supply cavity and the drainage cavity are provided in front of the plunger, and the water supply cavity and the drainage cavity are arranged adjacent to each other in the left-right direction.

In one embodiment, the extending direction of the water supply cavity and the drainage cavity is parallel to the reciprocating movement direction of the plunger, and both the drainage port and the water supply port are in front of the water supply cavity and the drainage cavity. The opening directions of the drainage port and the water supply port are perpendicular to the extending direction of the drainage cavity and the water supply cavity.

In one embodiment, the water supply cavity and the drainage cavity penetrate the pump body in the vertical direction, the check valve unit further includes a second drainage valve, and the first drainage valve is the drainage. The second drain valve is provided at the upper end of the cavity and is provided at the lower end of the drain cavity.

The above-mentioned objectives, technical means, and advantageous effects of the present invention can be clarified with reference to the detailed description of the following specific examples in which the present invention can be realized.

The same numbers and symbols in the drawings and specifications indicate the same or equivalent members.

FIG. 1 is a schematic view of a high pressure washer according to an embodiment of the present invention. FIG. 2 is a specific configuration diagram of the high pressure washer shown in FIG. FIG. 3 is a schematic view of a high pressure washer according to another embodiment of the present invention. FIG. 4 is an overall schematic view of a pump, a transmission mechanism, and a motor according to an embodiment of the present invention. FIG. 5 is a schematic explosive disassembly diagram of the pump, transmission mechanism, and motor of FIG. FIG. 6 is a cross-sectional view of the pump of FIG. 4 along the cross-sectional line AA, in which the plunger is in the first state. FIG. 7 is a cross-sectional view of the pump of FIG. 4 along the cross-sectional line AA, in which the plunger is in the second state. FIG. 8 is a cross-sectional view of the pump of FIG. 4 along the cross-sectional line BB. FIG. 9 is a cross-sectional view of the pump of FIG. 4 along the cross-sectional line CC. FIG. 10 is a schematic view showing an embodiment of a transmission mechanism of a high pressure washer. FIG. 11 is a schematic view showing another embodiment of the transmission mechanism of the high pressure washer. FIG. 12 is a schematic view showing still another embodiment of the transmission mechanism of the high pressure washer. FIG. 13 is a schematic view in which the pump is connected to the plunger via the crank link mechanism in the embodiment of the present invention, in which the plunger is in the first state. FIG. 14 is a schematic view in which the pump is connected to the plunger via the crank link mechanism in the embodiment of the present invention, in which the plunger is in the second state. FIG. 15 is a schematic view of a pump structure according to a second embodiment of the present invention. FIG. 16 is a schematic view of the pump structure of FIG. 15 as viewed from another viewpoint. FIG. 17 is another specific configuration diagram of the high pressure washer shown in FIG. FIG. 18 is a configuration diagram in which a part of the housing is removed and the battery pack is connected in the high pressure washer of FIG. FIG. 19 is a vertical sectional view of the high pressure washer shown in FIG. FIG. 20 is a plan view of the high pressure washer shown in FIG. FIG. 21 is a schematic perspective view in which an operator holds the high pressure washer with one hand. FIG. 22 is a schematic perspective view of the functional members of the high pressure washer shown in FIG. FIG. 23 is a cross-sectional view of the functional member of the high-pressure washer shown in FIG. 22 along the cross-sectional line EE, and the plunger is in the first state. FIG. 24 is a cross-sectional view of the functional member of the high pressure washer shown in FIG. 22 along the cross-sectional line EE, and the plunger is in the second state. FIG. 25 is a front view of the pump of the high pressure washer shown in FIG. FIG. 26 is a partial explosion view of the pump of the high pressure washer shown in FIG. FIG. 27 is a schematic perspective view seen from a different viewpoint from that of FIG. 26. FIG. 28 is a cross-sectional view of the pump of the high pressure washer shown in FIG. 25 along the cross-sectional line FF. FIG. 29 is a schematic perspective view of the pump body and a part of the speed reduction mechanism housing shown in FIG. FIG. 30 is a schematic view of the pump body and a part of the reduction mechanism housing shown in FIG. 29 as viewed from another angle. FIG. 31 is a connection configuration diagram of the plunger of the pump of the high pressure washer shown in FIG. 17 and the eccentric mechanism. FIG. 32 is a schematic view of the planetary gear reduction mechanism of the high pressure washer shown in FIG. FIG. 33 is a schematic view in which a discharge head and a battery pack are connected to the high pressure washer shown in FIG.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings so that those skilled in the art can easily understand the advantages and features of the present invention and clarify the technical scope of the present invention. ..

FIG. 1 is a schematic view of a high pressure washer 1 according to an embodiment of the present invention. 2 and 17 are specific configuration diagrams of the high pressure washer 1 shown in FIG. The high-pressure washer 1 is a hand-held type, and the hand-held high-pressure washer 1 is provided in a substantially pistol-shaped housing 10, a functional member 20 provided in the housing 10, and a hand-held high-pressure washer 1 provided in the housing 10. A trigger member 105 for controlling the operation / stop state of the water supply valve sealing system (not shown) having a water channel, and a liquid injection joint 16 are provided.

In this embodiment, for convenience of understanding, the left side of FIGS. 2 and 17 is the front (that is, the discharge direction of the water flow is the front), the right side is the rear, the upper part in the figure is the upper part, and the lower part in the figure is the lower part. And. The front side of the paper is on the left side, and the back side of the paper is on the right side. That is, the left side and the right side shown in FIG. The above definition is for illustration purposes only and should not be understood to be a limitation to this example.

The housing 10 has a handle 106 for gripping, a main body 107 provided at an angle with the handle 106, and a discharge portion 108 for discharging the cleaning liquid to the outside. In this embodiment, the housing 10 adopts a left-right Harvard structure. Specifically, as shown in FIGS. 20 and 21, the housing 10 is provided with the bisector T and the first half housing 101 and the second half housing 102 provided substantially symmetrically with respect to the bisector T. And have. In this embodiment, the bisector T can be understood as a plane formed by extending the seam of the first half housing 101 and the second half housing 102. The discharge unit 108 is provided with an outlet 1081 at its free end. That is, the outlet 1081 is provided at an end away from the handle 106.

The functional member 20 includes a motor 2 provided in the housing 10, a transmission mechanism 3 connected to the motor 2, and a pump 4 driven by the transmission mechanism 3. In the present embodiment, the functional member 20 is housed in the main body 107.

The trigger member 105 is rotatably provided on the handle 106 with a connection portion with the handle 106 as a fulcrum, and a part of the trigger member 105 is housed in the main body portion 107. Specifically, the trigger member 105 is a trigger. The handheld high pressure washer 1 further includes a control unit (not shown) connected to both the pump 4 and the motor 2. When it is necessary to perform cleaning work, a cleaning signal can be input to the control unit via the trigger member 105 to conduct the water passage in the water supply valve sealing system, and the external water source is the action of the pump 4 and the motor 2. The surface of the object can be cleaned by being discharged from the outlet 1081 through the water channel in the water supply valve sealing system.

In this embodiment, the discharge portion 108 of the handheld high-pressure washer 1 is provided with an accessory mounting portion (not shown) that can be operated so as to be connected to the discharge head 11. The discharge head 11 has a spray bar 111 having a predetermined length and a nozzle 112 connected to one end of the spray bar 111. The handle 106 is provided so as to form an angle with the discharge head 11.

In order to meet the demand for portability on hand, the high pressure washer 1 itself does not have a water tank for accommodating the water source, but is connected to an external water source via a water pipe, and the external water source is a pond, a faucet, or the like. There may be. The water from the external water source is pressurized by the pump and then discharged to the outside from the discharge head 11. Such a handheld high pressure washer has a small volume, is lightweight, and is easy to handle.

Specifically, as shown in FIGS. 2 and 18, one end of the liquid injection joint 16 is attached to the housing 10 or is integrally formed with the housing 10, and the other end is free to provide a water injection port 104. The liquid injection joint 16 is connected to an external water pipe through which the liquid flows through the water injection port 104 so as to guide the liquid to the inside of the handheld high pressure washer 1. The water injection port 104 is provided close to the handle 106. Specifically, in the front-rear direction, the water injection port 104 does not exceed the leading edge of the motor 2 forward and is located substantially below the motor 2. In this way, it is easy for the user to move the water pipe connected to the water injection port 104 with the other hand at any time while grasping the device with one hand, while the weight of the water pipe is also hung near the handle 106. When the water pipe is connected to the hand-held high-pressure washer 1, the center of gravity is still close to the handle 106, so that the arm fatigue phenomenon that occurs during one-handed work of the worker is effectively reduced, and the worker's work experience is enhanced. improves.

The handheld high pressure washer 1 can be supplied with alternating current or direct current. A handheld high-pressure washer that is powered by AC is limited to power supply, and the corresponding AC power supply must be placed in the usage scene, which reduces the convenience of applying it to outdoor scenes and also by AC. The handheld high pressure washer to be powered is limited to the length of the power cord and must be cleaned within the length range of the power cord, which limits the cleaning range and mobility of the handheld high pressure washer. .. Therefore, in the present embodiment, preferably, the handheld high pressure washer is supplied with direct current. Specifically, the DC power source is a rechargeable battery pack 9. The battery pack 9 is detachably attached to the housing 10 so as to supply power to the motor 2. The number of battery packs 9 may be one or two or more. In the embodiment described in the present invention, the number of battery packs 9 is one. The battery pack 9 is compatible with at least different types of DC tools and is versatile for power tools such as DC dryers, lawnmowers, mowers, chainsaws, pruning shears, electric drills, electric hammers, electric circular saws, etc. can do. For example, in this embodiment, the user can purchase only the main body of the high pressure washer 1 and attach the battery pack of other existing tools (for example, a dryer, a lawnmower, etc.) to the high pressure washer 1. It truly realizes energy sharing and is useful for general purpose battery packs.

Referring to FIG. 2, as described above, the handheld high pressure washer 1 itself does not have a water tank, and the water pipe 14 is connected to the water injection port 104 and is connected to an external water source via the water pipe 14. .. Thus, after the water pipe 14 is connected to the water inlet 104, in household activities, the user can use a high pressure washer by connecting the rear end of the water pipe to a faucet or by putting it in an external water source such as a pool, pond, or bucket. Can be held by hand and moved freely within the length range of the water pipe to perform water discharge cleaning. In outdoor activities, the user can always stop in the presence of water and put the rear end of the water pipe into an external water source to perform spout cleaning. The pump can suck the water from the external water source into the high pressure washer and then discharge it directly to the outside.

In order to realize that it is portable and can wash various articles, the handheld high pressure washer 1 needs to realize weight reduction and high cleaning ability at the same time, but the two are inconsistent with each other. ing. In order to reduce the weight of the handheld high pressure washer, it is necessary to reduce the weight of the battery pack 9 and the functional member 20 as much as possible. However, the weight reduction of the battery pack 9 is the operating time of the handheld high pressure washer 1. The weight reduction of the functional member 20 leads to a reduction in the cleaning efficiency of the handheld high-pressure washer 1, and further reduces the cleaning capacity. Further, the operating time and the cleaning efficiency are also restricted to each other, and for the same battery pack 9, the longer the operating time, the weaker the cleaning ability, and conversely, the stronger the cleaning ability, the shorter the operating time. Therefore, in this embodiment, it is necessary to balance the weight, operating time and cleaning efficiency of the high pressure washer.

The effective cleaning efficiency k of the handheld high-pressure washer 1 is equal to the working water pressure P multiplied by the working water flow rate Q. It is common to evaluate the cleaning effect of a high pressure washer based on the effective cleaning efficiency, and the larger the effective cleaning efficiency, the better the cleaning effect. However, for the same effective cleaning efficiency, the working water pressure is inversely proportional to the working water flow rate, and in order to improve the cleaning effect, those skilled in the art usually want to increase both at the same time, but try to increase both at the same time. If this happens, it will be necessary to increase the power of the motor, the weight of the entire device will increase, and the cruising time of the battery pack 9 will also decrease. Contrary.

The handheld high pressure washer 1 is applied to many work situations including washing balconies, corridors, outdoor tables and chairs, automobiles, bicycles, garages, pets, garden tools, windows, pools, outdoor stairs, etc. There is. The requirements for the working water pressure and the working water flow rate output to the outside by the handheld high-pressure washer 1 also differ depending on the work situation. The working water pressure refers to the ability to clean dirt. For a constant working water flow rate, the greater the working water pressure, the greater the impact force of the water flow on the target object per unit area, and the dirt from the surface of the target object. The peeling speed is also increased. The required working water pressure also changes depending on the target object to be cleaned, and the working water flow rate refers to the efficiency of cleaning dirt. For a constant working water pressure, the larger the working water flow rate, the more the cleaning of the target object is completed. The time to do is shortened. The above-mentioned constant working water flow rate and constant working water pressure can be understood as the minimum values that can wash the target object in cooperation with the corresponding working water pressure or working water flow rate.

The cruising time of the battery pack refers to the time during which the battery pack can maintain the normal operation of the handheld high-pressure washer 1. The cruising time of the battery pack 9 is influenced not only by the specifications of the battery pack itself but also by the operation mode of the handheld high pressure washer 1. With a battery pack of the same capacity, if the working water pressure during operation of the handheld high-pressure washer 1 is high and the working water flow rate is also large, or if either the working water pressure or the working water flow rate is large, the working water pressure is called. Compared to a hand-held high-pressure washer with a small working water flow rate, the cruising time of the battery pack is shortened.

In the handheld high-pressure washer according to the present embodiment, the working water pressure output to the outside is 0.4Mpa to 5Mpa, and the working water flow rate to be output to the outside is 1.5L / Min to 6L / Min. Preferably, the working water pressure output to the outside of the handheld high-pressure washer is 1.8 to 2.49 Mpa, and the working water flow rate to be output to the outside is 3 to 4.5 L / Min. Of course, the working water pressure output to the outside of the handheld high-pressure washer may be 2Mpa, 2.2Mpa, 2.4Mpa, and the working water flow rate output to the outside is 3L / Min, 3.5L / Min, 4L. / Min may be used.

Furthermore, I would like to re-emphasize that what is required of the high-pressure washer 1 according to this embodiment is a hand-held high-pressure washer having portability. When the definition of cleaning performance (working water pressure and working water flow rate) is completed, the operator pays attention to whether the equipment is small enough, convenient enough, or has sufficient cruising time. This is also an important issue that the inventor needs to consider and overcome.

In this embodiment, the total weight of the handheld high pressure washer 1 is 3 kg or less, and in the selectable embodiment, the total weight is 2.8 kg, 2.5 kg, 2 kg, or 1.8. Kilo, or 1.7 kg, or less than 1.5 kg. In one embodiment, the functional member 20 weighs 1000 grams or less, the battery pack 9 weighs 800 grams or less, and in another selectable embodiment, the functional member weighs 600 grams or less. Yes, the battery pack 9 weighs less than 400 grams. In one embodiment, the weight of the other members excluding the functional member 20 and the battery pack 9 is 500 grams or less, and more preferably, the weight of the other members is less than 400 grams or less than 300 grams. Due to the light weight, the hand-held high-pressure washer 1 can be held by hand for a long time to perform the cleaning work. In this embodiment, the battery pack 9 employs a lithium battery pack having a rated voltage of 18V to 42V and 1.5Ah to 3Ah so as to provide sufficient operating energy and reduce the weight. In another selectable embodiment, the rated voltage of the battery pack may be 28V-60V. Specifically, in this embodiment, the single battery pack employs a battery pack having a rated voltage of 20 V and 2 Ah. The time for the handheld high-pressure washer to continuously discharge the water stream to the outside is 10 to 60 minutes.

The motor 2, the transmission mechanism 3, and the pump 4 will be described in detail later, but the specific configuration thereof achieves both weight reduction and cleaning ability.

In addition to the weight itself, the position of the center of gravity also affects the user's actual weight experience. In this embodiment, the pump 4, the transmission mechanism 3 and the motor 2 in the functional member are arranged so that the center of gravity of the functional member is located in front of the tip point of the handle and the center of gravity of the battery pack is located behind the tip point of the handle. , Which are sequentially arranged from front to rear and are located at one end of the handle 106, while the battery pack 9 is located at the other end of the handle 106. In one selectable embodiment, at least one of the functional members and the battery pack 9 located at both ends of the handle 106 partially extends into the handle 106. In one selectable embodiment, all or part of the pump 4, transmission mechanism 3 and motor 2 in the functional member 20 is provided parallel to the handle 106, for example, the pump 4 is located at one end of the handle 106. The transmission mechanism 3 and the motor 2 are provided in parallel with the handle 106.

The functional member 20 and the battery pack 9 are two main heavy bodies of the hand-held high-pressure washer 1, respectively. By arranging the functional member 20 and the battery pack 9 at both ends of the handle 106, the hand-held high-pressure washer 1 is used for hand-held high-pressure washing. The center of gravity G of the machine 1 (the center of gravity of all the handheld high-pressure washers described here and below refers to the entire center of gravity when the battery pack is arranged but the discharge head is not connected) is the handle 106. Since it is located in the vicinity, the weight is basically in the hands of the user when grasped by the user, which is relatively labor-saving. Specifically, as shown in FIG. 21, the center of gravity G of the handheld high-pressure washer 1 is within 8 cm behind the rear end point B of the handle 106 and within 8 cm before the tip point A of the handle 106. In a selectable embodiment, in the front-rear direction of the handheld high-pressure washer 1, the center of gravity G is within 5 cm, 3 cm, 2 cm, and 1 cm in front of the rear end point of the handle 106 or the tip point A of the handle 106. It is in. In another selectable embodiment, the center of gravity G is 5 cm, 3 cm, 2 cm, 1 cm to the tip point A of the handle 106 behind the rear end point B of the handle 106. In another selectable embodiment, the center of gravity G is between the rear end point B of the handle 106 and the handle tip point A.

In this embodiment, the water injection port 104 is connected to the water injection port 104 because it is located near the center of gravity G of the handheld high-pressure washer 1, specifically, within 5 cm or 3 cm from the center of gravity G in the front-rear direction. The weight of the water pipe 14 also depends on the vicinity of the center of gravity G. Since the water injection port 104 is further located near the handle 106, specifically, 3 cm and 5 cm 5 cm in front of the tip point of the handle 106 and 3 cm and 5 cm behind the rear end point, the water pipe 14 is moved when the user moves. And other objects can be reduced in probability of being entangled or caught in each other.

In this embodiment, as shown in FIG. 33, the handle 106 is located behind the main body 107, and the discharge head 11 is located in front of the main body 107. When the battery pack 9 and the discharge head 11 are connected to the handheld high-pressure washer 1, for convenience of explanation, the portion of the handle 106 in front of the tip point A is set to the spray gun unit 103 (that is, the spray gun unit is at least at least. A functional member, a discharge portion, and a discharge head are provided), and the portion behind and below the rear end point B of the handle 106 is a power supply unit 90 (that is, the power supply unit is at least a battery pack mounting portion connected to the handle). , With a battery pack). As shown in FIG. 21, let C be a gripping support point at which the user grips the handle. The gripping support point C can be understood as a position where the index finger of the user abuts on the trigger when the user grips the handle. This gripping support point C is also a deflection point of the device. The distance from the center of gravity G1 of the spray gun unit 103 to the gripping support point C of the handle 106 is L1. The distance from the center of gravity G2 of the power supply unit 90 to the gripping support point C of the handle 106 is L2. In the present embodiment, the weight M1 of the spray gun unit 103 is larger than the weight M2 of the power supply unit 90. The inventor said, "When the product of M1 and L1 is larger than the product of M2 and L2, when the operator normally grips the device horizontally, that is, when the spray bar 111 is positioned in the horizontal position. In addition to the lifting force that lifts the device body, it is also necessary to apply a force F that overcomes this deflection. The force F that overcomes this deflection is applied by the wrist, and the rotational inertia moment (that is, the product of M1 and L1) is large. The more the force F applied by the wrist to overcome the deflection becomes larger, and if the force F is urged by the wrist, it tends to cause the worker's fatigue, the worker's wrist becomes stiff, and it is not suitable for long hours of work. I found that.

In order to allow the user to grip the device more comfortably and to improve the user's work experience as much as possible, in this embodiment, the center of gravity G2 of the power supply unit 90 is set so as to reduce the force applied to the wrist of the operator. The distance L2 between the handle 106 and the gripping support point C is increased, that is, the length of L2 is increased as much as possible. Specifically, in the present embodiment, as shown in FIGS. 17 and 33, the handle 106 is arranged so as to be inclined, and the handle 106 is arranged in the extending direction X1 of the handle 106 and the extending direction X2 of the main body 107 ( The main body is arranged so that the angle formed with the cleaning liquid (which extends in the discharge direction of the cleaning liquid) is larger than 90 degrees and smaller than 180 degrees. Further, in order to ensure that the weight is basically applied to the operator's hand when gripping the operator, the center of gravity G of the handheld high-pressure washer 1 is positioned between the tip point A and the rear end point B of the handle 106. The length of the hand-held high-pressure washer 1 in the front-rear direction is reduced as much as possible. In the present embodiment, the angle formed by the handle 106 between the extending direction X1 of the handle 106 and the extending direction X2 of the main body 107 (the main body 107 extends in the discharge direction of the cleaning liquid) is larger than 100 degrees, and It is arranged so that it is smaller than 160 degrees. Specifically, the angle formed by the extending direction of the handle and the extending direction of the main body is 130 degrees. As an option, the angle may be 110 degrees, 120 degrees, 125 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees.

In order to improve portability, in this embodiment, the overall length of the handheld high pressure washer 1 is less than 500 mm, preferably the overall length is 400 mm or 350 mm. The total length of the hand-held high-pressure washer 1 changes depending on the length of the discharge head. For example, when a long spear-shaped discharge head is used, the total length of the high-pressure washer can reach 1000 mm. .. Preferably, when the hand-held high-pressure washer 1 is not provided with any discharge head, the length of the main body of the hand-held high-pressure washer 1 is less than 300 or 250 mm. The overall height of the handheld high pressure washer 1 is less than 250 or 200 mm, and the overall width (excluding the battery pack) is less than 150 or 100 mm.

FIG. 3 shows another high-pressure washer that is different from the form of a portable hand-held high-pressure washer, and the high-pressure washer includes a main body 12 and a spray gun 13 that are arranged separately. The spray gun 13 is operated by hand. The spray gun 13 is provided with a discharge head 11. The spray gun 13 and the main body 12 are connected via a water pipe 14. A motor 2, a transmission mechanism 3, and a pump 4 are provided in the main body 12. In a preferred embodiment, a water tank 15 capable of accommodating a predetermined amount of water is further provided in the main body 12. As a result, the high pressure washer 1 can be operated at a distance from the water source. After the water in the water tank 15 is pressurized by the pump 4, the water is conveyed from the water pipe 14 to the spray gun 13, and the user operates the spray gun 13 to wash the object to be cleaned.

All of the above-mentioned different types of high-pressure washers 1 include a pump 4, a motor 2, and a transmission mechanism 3 that connects the motor 2 and the pump 4.

See FIGS. 4 and 5. The motor 2 is a general AC motor or DC motor. The motor 2 has a motor shaft 21 that rotates around its shaft. The motor shaft 21 outputs rotational power to the outside. In order to ensure the sealing property, the transmission mechanism 3 usually has a transmission case 30 covered with the outside. The transmission case 30 has two openings, one for connecting the transmission mechanism 3 to the motor 2 and the other opening for connecting the transmission mechanism 3 to the pump 4. belongs to. The pump 4 is driven by the motor 2 via the transmission mechanism 3 to increase the water pressure of the water flowing into the pump 4 and improve the cleaning effect of the discharged water.

In this embodiment, what is required of the high pressure washer is a handheld high pressure washer 1 having portability. As can be easily understood, this handheld high pressure washer must meet the requirements that the operator can carry it in various situations and in various places. However, due to the plurality of plungers, the volume and weight of the pump are relatively large. In order to drive the multi-plunger pump, a large amount of electric power is required, which inevitably consumes a large amount of energy. Since the high-pressure washer according to this embodiment uses a rechargeable battery pack as a power source, it is necessary to reduce energy consumption as much as possible in order to extend the continuous operation time.

Therefore, in this embodiment, as shown in FIGS. 4, 5, 19, 23, and 24, a single plunger 5 is provided inside the pump 4, that is, the pump 4 is provided with a single plunger 5. It is a single plunger pump. Thus, the problem of weight and volume of the multi-plunger pump has been solved. Moreover, since the driving energy required for the single plunger pump 4 is about 1/3 of that of the 3 plungers and about 1/2 of that of the 2 plungers, the operating time of the battery pack 9 is effectively extended.

On the other hand, in the drive structure of the conventional plunger pump, by driving one end of the plunger and connecting the high pressure chamber to the other end, the plunger reciprocates in the high pressure chamber and pressurizes water. When using a pump having two plungers, the two plungers normally reciprocate with a phase difference of 180 degrees, and in the case of three plungers, the plunger reciprocates with a phase difference of 120 degrees, so that the cleaning liquid is used. It is continuously discharged with almost no pulsation. However, in the case of a single plunger pump, since there is only one cavity pressed by the plunger, the pump absorbs water in one half cycle and drains it in the other half cycle in one reciprocating cycle, that is, the single plunger pump. Do not pump in half of each cycle. In order to realize continuous water discharge, it is necessary to raise the rotation speed of the motor to a predetermined range so that the water sucked in the other half cycle is discharged over one cycle, but the pulsation of the water discharge pressure of the pump is large. turn into. To solve the above problems, the present embodiment further provides a single plunger pump capable of continuously pumping.

The specific structure of the pump 4 of this embodiment will be described in detail below. For convenience of understanding, as shown in FIGS. 4, 22, 25, and 30, the dimension of the water flow discharge direction of the pump 4 is the height h of the pump 4, perpendicular to the water flow discharge direction, and on the rotation axis of the motor. The dimension of the pump 4 in the vertical direction is defined as the width w of the pump 4, and the dimension of the pump 4 extending in the direction of the plunger 5 is defined as the length l of the pump 4. The above definition is for illustration purposes only and should not be understood to be a limitation to this example.

As shown in FIGS. 4 to 7 and 22 to 30, the pump 4 includes a pump main body 46, a water supply port 431 and a drainage port 441 provided in the pump main body 46, and a connection port 49 connected to the transmission mechanism 3. It includes a single plunger 5 housed in the pump body 46. The plunger 5 is for pressurizing water, and the plunger 5 is a prism extending in the longitudinal direction. Preferably, the plunger 5 is made of a metal material, the two tips of the plunger 5 are hollow, and the plunger 5 is filled with a light body 58 having a smaller density, so that the mass of the plunger 5 is reduced and the plunger 5 reciprocates. The vibration problem of the entire device when moving is reduced, the power to push the plunger is reduced, and the energy consumption is reduced. In this embodiment, the light body is plastic, but in other examples, a light metal such as resin or aluminum may be used.

The length extension direction of the plunger 5 is perpendicular to the opening direction of the water supply port 431 and the opening direction of the drainage port 441, respectively. The plunger 5 is driven so as to reciprocate in its longitudinal direction. The water supply port 431 is for connecting to an external water source or connecting to a water pipe or a water gun. Water enters the inside of the pump 4 from the water supply port 431. Preferably, the number of water supply ports 431 is one. After the water is pressurized inside the pump 4, it is discharged from the drain port 441. The drain port 441 usually communicates with the discharge head 11 of the high pressure washer 1, whereby the discharge head 11 can discharge pressurized water. In order to avoid mutual interference between the water supply and the drainage, the water supply port 431 and the drainage port 441 are usually provided apart from each other. Preferably, the number of drains 441 is one.

To facilitate assembly, the pump 4 further comprises an upper pump cover 462 and a lower pump cover 463 that are detachably attached to the pump body 46, as shown in FIGS. 5, 25-29. The upper pump cover 462 and the lower pump cover 463 are symmetrically attached to both sides of the pump body 46. The upper pump cover and the lower pump cover are fixedly connected to the pump body 46 by a general fixing means such as a bolt. Of course, in other embodiments, the pump 4 may be integrally formed or may be formed by combining a plurality of components that can be easily conceived by those skilled in the art.

As shown in FIGS. 6, 19, 23 to 24, a central chamber 41 is further provided inside the pump 4. The inside of the central chamber 41 is hollow. The plunger 5 is preferably housed in the central chamber 41. The central chamber 41 extends in the longitudinal direction of the plunger 5. The dimension of the central chamber 41 along the longitudinal direction of the plunger 5 is greater than the length of the plunger 5 so that the plunger 5 always has a cavity 42 in the central chamber 41 as it reciprocates in that direction. As shown in FIGS. 6 and 23, when the plunger 5 moves to the lower end of the central chamber 41, the cavity 42 is located at the upper end of the central chamber 41. As shown in FIGS. 7 and 24, when the plunger 5 moves to the upper end of the central chamber 41, the cavity 42 is located at the lower end of the central chamber 41. That is, the central chamber 41 has an upper cavity 421 formed in the upper pump cover 462 and a lower cavity 422 formed in the lower pump cover 463. The transmission mechanism 3 is driven so that both ends of the plunger 5 reciprocate in the upper cavity 421 and the lower cavity 422, respectively. When the upper and lower pump covers 462, 463 are attached to the pump body 46, they form a complete central chamber 41.

As shown in FIGS. 8, 9 and 28, the pump 4 further has a water supply cavity 43, a drainage cavity 44 and a plunger hole 40 separated from the central chamber 41, and at least a part of the plunger 5 has a plunger hole. It is housed in 40. Most of the water supply cavity 43, the drainage cavity 44 and the central chamber 41 are located in the pump body 46. The water supply cavity 43 and the drainage cavity 44 are provided in parallel with each other and penetrate the pump body 46 in the vertical direction. The external water source enters the water supply cavity 43 through the water supply port 431, is pressurized through the cavity 42 to form a high-pressure water flow, and is eventually discharged from the drainage cavity 44 to the outside.

In this embodiment, the water supply cavity 43, the drainage cavity 44, and the central chamber 41 communicate with each other to form a penetrating communication passage. The water supply cavity 43 has a first water supply cavity 432 and a second water supply cavity 433 that are symmetrically provided. The water entering from the water supply port 431 can selectively enter the first water supply cavity 432 or the second water supply cavity 433. The central chamber 41 is connected to the first water supply cavity 432 and the second water supply cavity 433, respectively. In this embodiment, the first water supply cavity 432 is connected to one end of the central chamber 41, and the second water supply cavity 433 is connected to the other end opposite to one end of the central chamber 41. As shown in FIG. 9, communication passages 45 for communicating the central chamber 41 with each of the two water supply cavities are provided in the upper and lower pump covers 462 and 463. In this embodiment, one end of the central chamber 41 is provided with a communication passage 45 for communicating with the first water supply cavity 432, and the other end of the central chamber 41 is for communicating with the second water supply cavity 433. A passage 45 is provided. The extending direction of the communication passage 45 is perpendicular to the reciprocating movement direction of the plunger 5 (that is, the direction of the arrow OO'shown in FIG. 6).

The drainage cavity 44 also has a first drainage cavity 442 and a second drainage cavity 443 that are symmetrically provided. Similarly, the first drainage cavity 442 and the second drainage cavity 443 are connected to the central chamber 41 and the drainage port 441, respectively. The first drainage cavity 442 and the second drainage cavity 443 are each connected to opposite ends of the central chamber 41. Further, the first drainage cavity 442 and the second drainage cavity 443 are similarly communicated with the central chamber 41 via the communication passage 45. That is, the communication passage 45 located at one end of the central chamber 41 communicates with the first water supply cavity 432 and the first drainage cavity 442 and the central chamber 41, and the communication passage 45 located at the other end of the central chamber 41 is The second water supply cavity 433 and the second drainage cavity 443 communicate with the central chamber 41.

Since the water supply cavity 43, the drainage cavity 44, and the plunger hole 40 substantially control the volume of the pump body 46, in order to make the pump 4 more compact and compact, the arrangement form of the water supply cavity 43, the drainage cavity 44, and the plunger hole 40 And the opening dimensions need to be specially designed. In this embodiment, both the water supply cavity 43 and the drainage cavity 44 are provided on the same side of the plunger 5. Specifically, both the water supply cavity 43 and the drainage cavity 44 are provided in front of the plunger 5, and the water supply cavity 43 and the drainage cavity 44 are arranged adjacent to each other in the left-right direction (that is, the width direction of the pump 4). To. The plunger hole 40 extends in the vertical direction, and the extending direction of the plunger hole 40 coincides with the extending direction of the water supply cavity 43 and the drainage cavity 44.

As shown in FIGS. 25 and 30, the plane that passes through the position of half the length of the plunger hole 40 and is perpendicular to the reciprocating movement direction of the plunger 5 is defined as the central cross section R in the front-rear direction of the pump 4. The plunger hole 40 has a plunger hole projection 401 in the central cross section R, the water supply cavity 43 has a water supply cavity projection 430 in the central cross section R, and the drainage cavity 44 has a drainage cavity projection 440 in the central cross section R. In this embodiment, the plunger hole projection 401, the water supply cavity projection 430, and the drainage cavity projection 440 are all regular geometric figures. Specifically, all three projections are circular. The centers of the three projections (ie, the centers of the circles) end-to-end to form an isosceles triangle. The center U of the plunger hole projection is the apex, and the apex angle is 35 to 60 degrees. Preferably, the apex angle is 40 degrees. By designing in this way, the arrangement of the plunger hole 40, the water supply cavity 43, and the drainage cavity 44 in the left-right direction becomes more compact, and the maximization of the width of the pump 4 in the left-right direction is suppressed. In other embodiments, the three projections may be square or rectangular or irregular shapes. More specifically, the width of the water supply cavity 43 and the drainage cavity 44 in the arrangement direction is 18 mm to 60 mm. Preferably, the width is 28 mm.

Regarding the arrangement of the water supply port 431 and the drain port 441, this embodiment mainly provides two feasible forms. The details are as follows.

In one embodiment, as shown in FIGS. 4 to 8, the opening direction of the water supply port 431 is perpendicular to the opening direction of the drain port 441. The opening direction of the drain port 441 coincides with the opening direction of the outlet 1081 of the discharge portion 108. The water supply port 431 is located on the left side or the right side of the plunger 5, and the drain port 441 is located on the front side of the plunger 5. In the vertical direction, the water supply port 431 is provided in the central portion of the pump main body 46, and the drainage port 441 is also provided in the central portion of the pump main body 46.

In another embodiment, as shown in FIGS. 22 to 30, in order to avoid an increase in the width of the pump 4 due to the arrangement of the water supply port 431 and the drain port 441, both the water supply port 431 and the drain port 441 are described above. It is provided on the outlet 1081 side of the pump 4. The water supply port 431 is provided below the drainage port 441. Specifically, the water supply port 431 and the drainage port 441 are stacked and arranged in the extending direction of the plunger 5. The water supply port 431 and the drain port 441 are laminated and arranged in the central region of the width of the pump 4. When arranged in this way, the width of the pump 4 is not excessively increased. Since the water supply port 431 is located directly below the drainage port 441, the connection between the liquid injection pipe 435 and the water supply port 431 can be realized without adding a relay curve, the structure is compact, and the volume of the entire device is large. It becomes smaller. In this embodiment, both the water supply port 431 and the drainage port 441 are located between the water supply cavity 43 and the drainage cavity 44 and the outlet 1081 in the front-rear direction. Further, the opening direction of the water supply port 431, the opening direction of the drain port 441, and the opening direction of the outlet 1081 are the same. When the handheld high-pressure washer 1 is in an operating state, the movement of the plunger 5 causes an external water source to flow into the pump 4 from the water injection port 104, pressurize by the pump 4, and then from the drain port 441. It is discharged to the discharge unit 108. In the present embodiment, the opening direction of the drain port 441 coincides with the opening direction of the outlet 1081 of the discharge unit 108. When designed in this way, the external water source flows directly forward from the drain port 441, and it is not necessary to add a curve for changing the direction, so that the pressure loss of the water flow discharged from the discharge portion 108 is reduced. be able to.

Further, in the left-right direction, the axis I of the drain port 441 is located on the bisector T of the housing 10 of the handheld high-pressure washer 1, or has a dimension that deviates from the bisector T to the left or right. It is 30% or less of the width of the pump body 46. When the axis I of the drainage port 441 is located on the bisector surface T, at least a part of the water supply port 431 communicates with the water supply cavity 43 in the front-rear direction as shown in FIGS. 28 and 29, and the drainage port 441 At least a part of the drainage cavity 44 communicates with the drainage cavity 44. By providing in this way, the structure of the entire pump body 46 becomes compact, and the width of the pump 4 is minimized. The axis I of the drain port 441 may deviate to the left or right by a predetermined distance from the bisector T.

The "axis of the drainage port" is the geometric center of the drainage port 441 when the drainage port 441 has a regular shape, and the "axis of the drainage port" is the geometric center of the drainage port 441 when the drainage port 441 has an irregular shape. It should be understood as the physical center.

In this embodiment, the water supply port 431 and the drainage port 441, the water supply cavity 43 and the drainage cavity 44, and the plunger 5 are sequentially arranged from the front to the rear, so that the water in the high pressure chamber is pressed by the plunger 5 to be formed. The high-pressure water flow directly flows into the water supply cavity 43 on the front side and further flows into the drain port 441 on the front side, and the water flow moves in the forward direction, so that the pressure loss of the drainage is suppressed.

As shown in FIGS. 8 and 28, in the present embodiment, the pump 4 further includes a check valve unit 6 that controls the flow / shutoff of water in the passage. The check valve unit 6 has a first group of check valve units 61 and a second group of check valve units 62 that are symmetrically provided. Hereinafter, the check valve unit 61 of the first group will be described as an example. In this embodiment, the check valve unit 61 of the first group includes a first water supply valve 611 provided between the first water supply cavity 432 and the central chamber 41, and the central chamber 41 and the first drainage cavity 442. It is provided with a first drain valve 612 provided between the and. The first water supply valve 611 controls the flow / cutoff of the water flow between the first water supply cavity 432 and the central chamber 41, and the first drain valve 612 has the first drainage cavity 442 and the central chamber 41. Control the flow and blockage of water flow between. When the first water supply valve 611 is opened, the water in the first water supply cavity 432 can flow into the central chamber 41. Then, due to the unidirectional conduction of the first water supply valve 611, the first water supply valve 611 moves the water flow only from the first water supply cavity 432 toward the central chamber 41. When the first water supply valve 611 is closed, the water in the first water supply cavity 432 cannot flow into the central chamber 41, in which case the first water supply cavity 432 is separated from the central chamber 41. Similarly, when the first drain valve 612 is opened, the water in the central chamber 41 can flow into the first drain cavity 442, and the first drain valve 612 serves as a one-way conduction. Fulfill. When the first drain valve 612 is closed, the water in the central chamber 41 cannot flow into the first drain cavity 442, and the water collects in the central chamber 41.

In this embodiment, the plunger 5 in the central chamber 41 controls the opening and closing of the check valve unit 61 of the first group. In particular, the plunger 5 can control the first water supply valve 611 to be opened and the first drain valve 612 to be closed at the same time. The plunger 5 can be further controlled so that the first water supply valve 611 is closed and the first drain valve 612 is opened at the same time. That is, the plunger 5 can control so that the first water supply valve 611 and the first drain valve 612 are in the open state or the closed state, respectively, and both states are different. As shown in FIGS. 6 and 23, the state in which the plunger 5 moves to the lowermost end of the central chamber 41 is set as the first state, and in this state, the plunger 5 starts to move from the lowermost end to the upper end. At this time, the first water supply valve 611 is opened and the first drain valve 612 is closed. Therefore, the water flows into the central chamber 41 from the first water supply cavity 432, but does not flow out from the central chamber 41. Water has accumulated in the central chamber 41. After that, the plunger 5 continues to move from the lowermost end to the upper end of the central chamber 41 and continues to move to the uppermost end of the central chamber 41 (as shown in FIGS. 7 and 24), and the plunger 5 at this time is set to the second state. To do. In this second state, the plunger 5 begins to move from the uppermost end to the lower end. At this time, the first water supply valve 611 is closed and the first drain valve 612 is opened. Water cannot flow from the water supply cavity 43 into the central chamber 41, and the water originally in the central chamber 41 is pressed by the plunger 5 to become a high pressure, flows into the first drainage cavity 442, and flows from the drainage port 441. It flows to the discharge head 11 and is discharged.

Similarly, the plunger 5 can also control the opening and closing of the check valve unit 62 of the second group. The second group check valve unit 62 has a second water supply valve 621 and a second drain valve 622. The second water supply valve 621 is provided between the second water supply cavity 433 and the central chamber 41, and the second drain valve 622 is provided between the central chamber 41 and the second drainage cavity 443. When the plunger 5 is in the first state, the second water supply valve 621 is closed and the second drain valve 622 is opened, so that the water in the central chamber 41 flows out from the second drain cavity 443. When the plunger 5 is in the second state, the second water supply valve 621 is opened and the second drain valve 622 is closed, so that water flows from the second water supply cavity 433 into the central chamber 41. Therefore, the check valve unit 62 of the second group and the check valve unit 61 of the first group complement each other, and the pumping efficiency of the pump can be improved. During the movement of the plunger 5 from the first state to the second state, the water entering from the water supply port 431 enters the central chamber 41 through the first water supply cavity 432, and is drained by the pressing of the plunger 5. It is discharged from the cavity 443 to the drain port 441. During the movement of the plunger 5 from the second state to the first state, the water entering from the water supply port 431 enters the central chamber 41 through the second water supply cavity 433, and the first drainage is performed by pressing the plunger 5. It is discharged from the cavity 442 to the drain port 441 and discharged through the discharge head 11.

Further, as shown in FIGS. 8 and 28, the first water supply valve 611 includes a valve body 610, a check valve 613 located in the valve body 610, and an urging member 614 for urging the check valve 613. To be equipped. When the plunger 5 is in the second state, the urging member 614 generates an urging force such that the check valve 613 closes the first water supply cavity 432. As the plunger 5 moves from the second state to the first state, the volume of the cavity near the check valve 613 gradually increases, which increases the pressure against the urging member 614 and eventually the check valve. The 613 is opened, that is, the first water supply valve 611 changes from the closed state to the open state. Similarly, the first drain valve 612 includes a valve body 617, a check valve 615 located in the valve body 617, and an urging member 616 for urging the check valve 615. The direction of the check valve 615 of the first drain valve 612 and the urging direction of the urging member 616 are opposite to the direction of the check valve 613 of the first water supply valve 611 and the urging direction of the urging member 616. is there. Therefore, as the plunger 5 moves from the second state to the first state, the pressure against the urging member 616 decreases, and the check valve 615 closes the first drainage cavity 442 due to the urging force. , The first drain valve 612 changes from the open state to the closed state.

Since the check valve unit 61 of the first group and the check valve unit 62 of the second group are provided symmetrically, the second check valve unit 62 is provided during the movement of the plunger 5 from the second state to the first state. The second water supply valve 621 of the check valve unit 62 of the group changes from the open state to the closed state, while the second drain valve 622 changes from the closed state to the open state.

After determining the type and structure of the pump 4 as described above, the inventor has also conducted extensive research on the positional relationship between the single plunger pump 4 and the housing 10. According to the assembly relationship between the pump and the housing according to the present embodiment, while ensuring the miniaturization and portability of the handheld high pressure washer 1, the self-priming time of the high pressure washer 1 is long and the pressure loss of drainage is large. The problem was also solved. Solving this problem is an important step in determining whether the handheld high pressure washer 1 can be widely used in the industry. The relationship between the assembly position of the pump 4 and self-priming will be described in detail below.

The hand-held high-pressure washer 1 according to the present embodiment is connected to an external water source via a water pipe 14, and when the hand-held high-pressure washer 1 starts operating, the internal cavity of the single plunger pump 4 itself has air. On the other hand, since the internal cavity of the connected water pipe 14 also has a predetermined amount of air, by driving the reciprocating movement of the plunger 5 by the motor 2, the external water source pushes the air in the water pipe 14 together with the pump 4. Entering the central chamber 41, the water supply and drainage of the upper pump cover 462 of the pump 4 will be described below as an example.

When the plunger 5 is in the first state shown in FIGS. 6 and 23, a large amount of gas is mixed in the water source entering the upper cavity 421, and the first state of the plunger 5 (FIGS. 6 and 23). During the movement from to the second state (FIGS. 7 and 24), the plunger 5 presses the upper cavity 421 in the upper pump cover 462, because the upper cavity 421 contains a large amount of gas. The pressing force of the plunger 5 pressing the water source is equal to or less than the urging force of the urging member 616 of the first drain valve 612 to urge the check valve 615, and the gas collects around the check valve 615. Therefore, the valve opening becomes discontinuous, that is, the drainage becomes discontinuous, so that the pressure loss of the drainage is large and the need for cleaning work cannot be satisfied.

At least two situations are possible during the transition of the plunger 5 from the second state to the first state. First, the check valve 615 of the first drain valve 612 is not completely closed (ie, gas collects around the check valve 615 during drainage, causing the check valve 615 to tilt. At this time, even if the plunger 5 continues to move from the uppermost end to the lower end of the central chamber 41 and moves to the lowermost end of the central chamber 41, water absorption cannot be completed due to gas leakage in the upper cavity. The second is that the check valve 615 of the first drain valve 612 is completely closed and there is a lot of gas in the upper cavity 421, so that the gas expands during evacuation of the upper cavity 421. The negative pressure formed in the upper cavity 421 becomes insufficient, and the check valve 613 of the first water supply valve 611 swings up and down, resulting in discontinuity in water supply. As a result, the plunger 5 cannot be controlled at the same time so that the first water supply valve 611 and the first drain valve 612 are in the open state or the closed state, respectively, and both states are different. Cannot perform normal cleaning work.

Therefore, in the present embodiment, the inventor solves the above problems by designing the arrangement of the single plunger pump 4 and the housing 10 and the structure of the single plunger pump 4 itself by utilizing the phenomenon that the gas floats in water. Settled. Specifically, when water and gas are mixed, the gas floats. Therefore, in this embodiment, the single plunger pump 4 is arranged along the vertical direction in the housing 10, and the drain port 441 is provided close to the check valve 613 of the first drain valve 612. With this setting, the external water source flows into the water supply cavity from the water supply port 431, and most of the gas floats and flows above the water supply cavity 43. That is, the plunger 5 is put into the first state (the vacuumed state of the upper cavity 421), water enters the upper cavity 421 together with the gas, and most of the gas is located at the uppermost part of the upper cavity 421. At this time, the plunger 5 moves to the second state (presses the upper cavity 421), the first drain valve 612 is opened, and most of the gas is pressed to the outside from the first drain valve 612. Go out to. Further, since the drain port 441 is provided adjacent to the check valve 615 of the first drain valve 612, the gas flow path is short, and the gas is immediately discharged to the outside from the drain port 441.

In this embodiment, the vertical distance L3 between the contact surface between the check valve 615 of the first drain valve 612 and the valve body 617 and the uppermost end of the drain port 441 is 20 mm or less. As an option, the vertical distance may be 18 mm, 16 mm, 14 mm, 12 mm, 10 mm, 9 mm, 8 mm, 7 mm, 6 mm, 5 mm, 4 mm, 3 mm, 2 mm, 1 mm. In order to make the exhaust faster and more complete, the vertical distance L3 is preferably 5 mm or less. As can be understood, the fact that the vertical distance here is 20 mm or less is an absolute value distance. That is, the uppermost end of the drain port 441 is located above or below the contact surface 615 between the check valve 615 of the first drain valve 612 and the valve body 617. Specifically, as shown in FIG. 28, the uppermost end of the drain port 441 can be designed to be located below the contact surface. The distance between the uppermost end of the drain port 441 and the contact surface is 3 mm. Of course, in other embodiments, the uppermost end of the drain port 441 may be designed to be located at substantially the same height as the contact surface.

More specifically, as shown in FIGS. 25 and 28, in the vertical direction, the lowermost end of the drain port 441 is flush with the central cross section R of the pump body 46 or is located above the central cross section R. Designed to be. In this case, the position of the drain port 441 designed upward facilitates the discharge of gas in the central chamber 41.

Further, when the plunger 5 is in the second state (see FIGS. 7 and 24), the water sucked into the upper pump cover 462 more easily flows out to the outside. Therefore, in this embodiment, the first The drain valve 612 of the above is arranged along the vertical direction. Specifically, the cleaning liquid presses the check valve 615 operably, moves the check valve 615 inside the valve, and the direction of movement of the check valve 615 is parallel to the plunger 5. With this design, when the cleaning liquid sucked into the upper pump cover 462 is pressed and flows out to the outside, the gas mixed in the cleaning liquid is easily discharged. As can be understood, in the present embodiment, the moving direction of the check valve of the second drain valve 622 is also parallel to the plunger 5. That is, the second drain valve 622 is also arranged along the vertical direction.

Further, in this embodiment, the first water supply valve 611 is arranged along the vertical direction in order to allow an external water source to flow into the water supply cavity more easily. Specifically, the cleaning liquid presses the check valve 613 operably, moves the check valve within the valve body 610, and the movement direction of the check valve 613 is parallel to the plunger 5. As can be understood, in the present embodiment, the moving direction of the check valve of the second water supply valve 621 is also parallel to the plunger 5. That is, the second water supply valve 621 is also arranged along the vertical direction.

The stroke, diameter and reciprocating number of reciprocating movements of the plunger 5 dominate the flow rate of the pump. In order to explain the relationship between the parameters of the pump 4 in detail, in this embodiment, the diameter of the plunger is D (unit: mm), the stroke of the plunger is S (unit: mm), and the reciprocating frequency of the plunger movement is set. Let n (unit: rpm) and the flow rate of the pump be B (unit: L / min). In this case, B = D × S × n × k, where k represents a coefficient (constant). Therefore, when the frequency of reciprocating movement of the plunger is constant (when the rotation speed of the drive motor is constant), in order to achieve a predetermined discharge flow rate B (L / min), the diameter D is increased and the stroke S is increased. It is necessary to make it smaller, or make the diameter D smaller and make the stroke S larger.

However, the larger the diameter of the plunger, the wider the width of the pump 4, and the larger the stroke of the plunger, the longer the length of the pump 4, and when the predetermined flow rate B is satisfied, which of the diameter D and the stroke S of the plunger is used. The setting depends on the volume of the pump 4 and directly affects the portability of the handheld high pressure washer 1. Further, as the diameter increases, the extrusion area of the plunger 5 increases, the required thrust also increases, and in order to increase the thrust, the electric motor requires a larger electric power (a motor having a larger volume). , It is necessary to reinforce the pump body that receives the reaction force. As a result, the width of the hand-held high-pressure washer 1 becomes wider, and the cost also increases. On the other hand, when the stroke S becomes large, the amount of movement of the plunger 5 becomes large, the pump 4 becomes long in the longitudinal direction, and when the frequency of reciprocating movement of the pump is constant, when the stroke S becomes large, the movement of the plunger becomes large. The speed is also increased, and it is necessary to use a material having higher wear resistance, which leads to an increase in cost.

In this embodiment, in order to change the discharge pressure of the handheld high-pressure washer within a certain range, the rotation speed of the motor is set to be adjustable, that is, the frequency n of the reciprocating movement of the pump is within a certain range. It changes with. Specifically, as the frequency n of reciprocating movement increases, the extrusion amount decreases, so it is necessary to reduce the diameter of the plunger. Unless the length of the plunger is increased, the size of the plunger becomes smaller and the flow rate of the pump becomes smaller. B becomes smaller. On the other hand, when the frequency n of the reciprocating motion becomes small, the extrusion amount becomes large, so that the size of the plunger 5 becomes unfavorably large. Therefore, the reciprocating frequency that is too small is not appropriate. Further, in a pump having a constant parameter, the discharge flow rate does not increase with an increase in the reciprocating movement frequency n, but increases with an increase in the movement frequency when the movement frequency is lower than the constant movement frequency, while being constant. If it is higher than the movement frequency of, the discharge flow rate does not increase remarkably, but decreases as the reciprocating movement frequency n increases. The pump requires a constant water absorption time in one reciprocating movement cycle, that is, the pump requires a constant self-absorption time. Therefore, if the self-absorption time is not secured in the reciprocating movement cycle, the pump will be in water absorption. If the volume of the cavity cannot be used effectively and the cycle is shortened, the water absorption time will be insufficient and the pump cavity will start draining before it is filled with water, resulting in a low flow rate.

Therefore, it is necessary to appropriately set the diameter D (mm) of the plunger, the stroke S (mm), and the frequency n (rpm) of the reciprocating movement in consideration of the pump dimensions, cost, discharge flow rate B (L / min), and the like. There is. The inventor has experimentally obtained pump dimensional parameters that allow the pump's discharge flow rate and pressure to meet household cleaning needs while minimizing volume and cost. The ratio of the pump flow rate to the pump volume is taken as the pump flow rate volume ratio, and this parameter reflects the relationship between the pumping capacity of the pump and the volume of the pump. The larger the flow rate of the pump, the stronger the cleaning capacity. Therefore, those who are in the industry want the flow rate of the pump to be large, and the smaller the volume of the pump, the more portable the high-pressure washer is. Therefore, those who are in the industry want that the volume of the pump is small. Therefore, the larger the parameter of flow rate / volume ratio, the more advantageous it is. According to experiments, the inventor said, "The stroke range of the plunger 5 is 3 to 16 mm, and the diameter range of the plunger is 6 to 16 mm. Considering the mechanical strength and assembly of the pump, the length of the plunger Since the selectable range is 45 to 100 mm, the pump volume range is 63000 mm ^ 3-85000 mm ^ 3, and the flow volume ratio range is 1.4 to 1.9. " Got In this embodiment, the length of the plunger 5 is 58 mm, the stroke of the plunger 5 is 5.4 mm, the diameter of the plunger 5 is 12 mm, and the maximum flow rate volume ratio that can be achieved is 1.9. Is. In another selectable embodiment, the length of the plunger 5 is 54 mm, 60 mm, 62 mm, 68 mm, 90 mm, the stroke of the plunger is 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm and the diameter of the plunger is. It may be 8 mm, 10 mm, 14 mm, 16 mm.

As mentioned above, in order to make the handheld high pressure washer 1 smaller and more portable, the arrangement of the functional members 20 in the housing must be considered in particular. Whether or not the volume of the handheld high pressure washer 1 becomes small is mainly determined by the length, width, and height.

The width of the handheld high pressure washer 1 is mainly controlled by the arrangement and arrangement of the functional members 20.
In this embodiment, the length l of the pump 4 is larger than the width w of the pump 4. Specifically, the length l of the pump 4 is about 80 mm, and the width w of the pump 4 is about 50 mm. is there. The housing 10 has a pump case 17 that is at least partially covered around the pump 4. In order to suppress the maximization of the width of the handheld high pressure washer 1, the pump 4 is set so that the ratio of the width w1 in the left-right direction of the pump case 17 to the width w2 in the left-right direction of the handle 106 is 3 or less. It is arranged in the housing 10. Specifically, in the present embodiment, the ratio of the width w1 in the left-right direction of the pump case 10 to the width w2 in the left-right direction of the handle 106 is about 1.3 to 1.8. In addition to using the single plunger pump 4 having a small volume, in this embodiment, the single plunger pump 4 is arranged along the vertical direction in the housing 10. Specifically, the pumps 4 are arranged in the housing 10 so that the length extension direction of the plunger 5 is parallel to the bisector T, and in this case, the upper pump cover 462 and the lower in the left-right direction. Each of the pump covers 463 extends across the bisector T of the housing 10. Further, the motor 2 is arranged as a high-speed compact motor. Specifically, the idling speed of the motor 2 is 10,000 rpm or more, the motor shaft of the motor 2 extends in the front-rear direction, and the pump 4 is provided in front of the motor 2. The transmission mechanism 3 includes a deceleration mechanism that is connected to the high-speed motor 2 so as to be able to transmit power. When the input rotation speed range of the rotation-reciprocating conversion structure that is a set with the pump 4 and the pump 4 is constant, the reduction mechanism and high speed are compared with the case where a low-speed motor whose output rotation speed is within the input rotation speed range is directly used. A rational combination with the motor can significantly reduce the overall weight and volume of the motor and transmission mechanism. The idling output rotation speed of the speed reduction mechanism is 3000 rpm or 2500 rpm or 2200 rpm or 2000 rpm or less. The reduction ratio of the reduction mechanism is 12: 1-3: 1 (for example, about 10: 1, 8: 1, 7: 1, 6: 1, 5: 1, 4: 1 and the like). In this embodiment, the width of the motor 2 in the left-right direction is effectively reduced, the volume and weight of the motor 2 can be reduced to less than half, and the handheld high-pressure washer 1 is compared with the case where the low-speed motor is directly used. The portability of the is improved. In this embodiment, as shown in FIG. 29, half of the transmission case 30 is integrally molded with the pump body 46.

The length of the handheld high pressure washer 1 is also mainly controlled by the arrangement and arrangement of the functional members 20.

In this embodiment, the length l of the pump 4 is larger than the height h of the pump. The pump 4 is arranged along the vertical direction in the housing 10 so that the length of the functional member 20 in the front-rear direction is 200 mm or less (that is, in the vertical direction, the upper pump cover 462 is the lower pump cover 463. The pump 4 is located in the housing so that it is located above.)

Further, in this embodiment, as shown in FIGS. 5 to 7, 23, and 31, the transmission mechanism 3 includes an eccentric mechanism 7 connected to the motor. On the side portion perpendicular to the longitudinal direction of the plunger 5, the plunger 5 has a mounting portion 50 for mounting the eccentric mechanism 7. In this embodiment, the mounting portion 50 is a recess that is recessed inward. The mounting portion 50 is located at the center of the plunger 5. The eccentric mechanism 7 is fixed in the mounting portion 50 via the mounting bearing 71. The fixed mounting form is not limited to the mounting bearing 71, and may include general forms such as flat fit and spline fitting. As can be conceived by those skilled in the art, the eccentric mechanism 7 includes the plunger 5 and the plunger 5. It may be integrally molded. The eccentric mechanism 7 includes an eccentric shaft 72 and a rotating shaft 33 connected to the eccentric shaft 72. In this embodiment, the eccentric shaft 72 is fixedly connected to the rotating shaft 33, and the connection form may be integrally molded. The center of the rotating shaft 33 is provided eccentrically with the center of the eccentric shaft 72. The rotating shaft 33 is provided with a support bearing 34 that supports the rotating shaft 33. From FIG. 6, the eccentric distance between the center of the rotating shaft 33 and the center of the eccentric shaft 72 is d. The transmission mechanism 3 drives the rotating shaft 33 to rotate around the center of the rotating shaft 33, while the eccentric shaft 72 causes the plunger 5 to rotate around the center of the eccentric shaft 72 via the mounting portion 50 and the mounting bearing 71. Drive to do. Since the plunger 5 has an eccentric distance d between the rotating shaft 33 and the eccentric shaft 72, the plunger 5 rotates eccentrically with respect to the rotating shaft 33. At least a part of the eccentric mechanism 7 is located in the pump body 46. That is, in the front-rear direction, the eccentric mechanism 7 partially overlaps with the pump 4. By designing in this way, the length of the handheld high-pressure washer 1 in the front-rear direction is further shortened, and the volume of the entire device is further reduced. In this embodiment, the single plunger pump 4 is arranged in the housing 10 along the vertical direction, and the eccentric shaft 72 of the eccentric mechanism 7 is attached to the center of the plunger 5, so that the length of the functional member 20 in the front-rear direction is minimized. To become. Specifically, the length of the functional member 20 in the front-rear direction is 150 mm or less so that the length of the entire device in the front-rear direction is the shortest.

As shown in FIG. 6, in one embodiment, the reduction mechanism is a gear transmission device. The speed reduction mechanism includes a pinion 31 connected to the motor shaft 21 and a large gear 32 that meshes with the pinion 31. The large gear 32 is fixedly connected to the rotating shaft 33. In this embodiment, the rotating shaft 33 is arranged parallel to the motor shaft 21. By the meshing transmission between the large gear 32 and the pinion 31, the motor shaft 21 is driven so that the rotating shaft 33 rotates around its center. Since the eccentric shaft 72 is fixedly connected to the rotating shaft 33, the eccentric shaft 72 also rotates around the center of the rotating shaft 33. Therefore, in the eccentric shaft 72, the plunger 5 moves around the center of the rotating shaft 33. Drive to rotate. Therefore, the motor 2 can be driven so that the plunger 5 moves eccentrically. In this embodiment, the motor 2 drives the movement of the plunger 5 by transmitting a one-stage gear.

In another embodiment shown in FIG. 10, the speed reduction mechanism includes a first bevel gear 351 connected to the motor shaft 21 and a second bevel gear 352 connected to the rotating shaft 33. The first bevel gear 351 and the second bevel gear 352 mesh with each other and transmit. The motor shaft 21 and the rotation shaft 33 are arranged along the vertical direction. Similarly, the plunger 5 is fixedly connected to the eccentric shaft 72 provided eccentrically with respect to the rotating shaft 33 via the mounting portion 50. By the cooperation of the first bevel gear 351 and the second bevel gear 352, the motor 2 is driven so that the plunger 5 moves eccentrically. In this embodiment, the motor 2 drives the movement of the plunger 5 by transmitting a one-stage bevel gear.

In another embodiment shown in FIG. 11, the motor 2 drives the movement of the plunger 5 by transmitting multi-stage gears. In this embodiment, the speed reduction mechanism includes an intermediate shaft 36 and a rotating shaft 33 connected to the intermediate shaft 36 so as to be able to transmit power. The intermediate shaft 36 is provided parallel to the motor shaft 21. The intermediate shaft 36 and the motor shaft 21 are connected so as to be able to transmit power via the first stage gear 361. The rotating shaft 33 is not directly connected to the motor shaft 21. The rotating shaft 33 and the intermediate shaft 36 are connected so as to be able to transmit power via a second-stage gear 362. On the other hand, the rotating shaft 33 is eccentrically connected to the plunger 5 as in some of the above embodiments. The rotating shaft 33 is provided parallel to the intermediate shaft 36. The advantage of adopting such a configuration is that the rotational output of the plunger 5 can be adjusted by changing the transmission ratio between the first-stage gear and the second-stage gear.

In another embodiment shown in FIGS. 12 and 32, the speed reduction mechanism is a planetary gear speed reduction mechanism 302. Specifically, the planetary gear reduction mechanism includes a sun gear 320, a planetary gear 322, 324, and an internal gear 321. The sun gear 320 is fixedly provided on the motor shaft, and the planetary gears 322 and 324 are provided. , The planetary gears 322 and 324 have two gears of the same size, respectively, which mesh with the sun gear 320 and the internal gear 321 and are fixedly connected to the eccentric mechanism 7. When the motor shaft rotates, the planetary gear 322 is driven so as to orbit around the internal gear 321. Therefore, the eccentric mechanism 7 is rotationally moved. In this embodiment, a planetary gear is used for deceleration, and the sun gear is fixedly provided on the motor shaft. Therefore, when the reduction ratio is constant, the volume of the reduction mechanism is minimized and the handheld high pressure washer 1 Can be made smaller and more portable.

In the above embodiment, all the plungers 5 are connected to the eccentric mechanism 7, and the eccentric rotational movement of the eccentric mechanism 7 drives the plunger 5 to linearly reciprocate in the longitudinal direction thereof. In the present invention, the plunger 5 is not limited to being connected to the eccentric mechanism 7, and the plunger 5 can be connected to another mechanism to realize linear reciprocating movement in the longitudinal direction thereof. In the embodiment shown in FIGS. 13 and 14, the plunger 5 is connected to the crank link mechanism 8. The crank link mechanism 8 includes a link 81 and a crank 82 that are connected to each other. One end of the link 81 is connected to the crank 82, and the other end of the link 81 is connected to the plunger 5. One end of the crank 82 is connected to the link 81, and the other end of the crank 82 is connected to the transmission mechanism 3. The connection portion between the link 81 and the crank 82 constitutes a rotation fulcrum 83, so that the link 81 and the crank 82 can rotate relative to each other around the rotation fulcrum 83. As shown in FIGS. 13 and 14, the crank link mechanism 8 can convert the rotational motion of the transmission mechanism 3 into a reciprocating motion in the longitudinal direction of the plunger 5. FIG. 13 shows that the plunger 5 is in the first state due to the action of the crank link mechanism 8, and FIG. 14 shows that the plunger 5 is in the second state.

In the schematic side view shown in FIG. 16, the transmission mechanism 3 includes a transmission shaft 38 that is connected to the motor shaft 21 so as to be able to transmit power. The transmission shaft 38 is connected to the motor shaft 21 so as to be able to transmit power by meshing gears. The transmission shaft 38 is provided in parallel with the motor shaft 21. The transmission shaft 38 is provided with a support bearing 34. The transmission shaft 38 is connected to the drive wheels 51 in the axial direction thereof. The rotation of the motor 2 drives the rotation of the transmission shaft 38, and the transmission shaft 38 drives the rotation of the drive wheels 51 and the driven wheels 52. During the rotation of the drive wheels 51 and the driven wheels 52, water can move from the first chamber 53 to the second chamber 54. By adopting such a mechanism, the transmission mechanism 3 is provided integrally with the pump 4, and the volume dimension of the entire device can be further reduced.

In the embodiment shown in FIGS. 15 to 16, the pump 4 includes a drive wheel 51 connected to the transmission mechanism 3 and a driven wheel 52 that meshes with the drive wheel 51. The pump 4 further includes a first chamber 53 and a second chamber 54, which are provided on both sides of the drive wheels 51, respectively. The first chamber 53 and the second chamber 54 are separated by a driving wheel 51 and a driven wheel 52. A water supply port 431 is connected to the first chamber 53, and a drain port 441 is connected to the second chamber 54. The gap between the gears of the drive wheels 51 or the driven wheels 52 forms a transport cavity 55 for accommodating water. As shown in FIG. 15, the rotation direction of the drive wheel 51 is a clockwise direction, and the rotation direction of the driven wheel 52 is a counterclockwise direction. As the drive wheels 51 rotate, the transfer cavity 55 communicates with the first chamber 53, and the water in the first chamber 53 enters the transfer cavity 55 and moves to the second chamber 54. During the rotation of the drive wheels 51, the inner wall 48 of the housing of the pump 4 seals the transfer cavity 55, so that the water in the transfer cavity 55 does not leak to the outside. When the drive wheel 51 rotates to the communication position between the transfer cavity 55 and the second chamber 54, the water in the transfer cavity 55 enters the second chamber 54 and is eventually discharged to the outside from the drain port 441. .. In order to improve the transfer efficiency, the water in the first chamber 53 further enters the transfer cavity 55 of the driven wheel 52. It can be conveyed into the second chamber 54 via the driven wheel 52. The advantage of adopting this type of pump is that it makes the overall structure more compact.

The above examples only show some embodiments of the present invention. Although the description is detailed, the above embodiment should not be understood as limiting to the scope of rights of the invention. A general engineer in the art should recognize that "all appropriate modifications and improvements to the above embodiments fall within the scope of the present invention, as long as they do not deviate from the gist of the present invention."

Claims (14)

It is a handheld high-pressure washer that is powered using a DC power supply and can be connected to an external water source via a water pipe.
A housing having a handle for gripping, a main body portion provided at an angle with the handle, and a discharge portion for discharging cleaning liquid to the outside , which is substantially symmetrical with respect to the bisector surface and the bisector surface. A housing having a first half housing and a second half housing provided for the purpose of
A motor provided in the housing, and a pump driven by said motor, a functional member having a transmission mechanism, wherein the pump, the driven by a motor to transport a cleaning liquid to the outside, the pump, A pump body, a plunger housed in the pump body, a water supply port and a drain port provided in the pump body, a water supply cavity communicating with the water supply port, a drainage cavity communicating with the drain port, and a central chamber. By moving the plunger, the cleaning liquid flows into the central chamber through the water supply port and flows out from the drain port to the discharge portion, and the transmission mechanism is connected to the plunger. The motor includes a functional member that drives the reciprocating movement of the plunger via the transmission mechanism.
In a hand-held high-pressure washer including a check valve unit that controls unidirectional flow of cleaning liquid from the water supply cavity into the central chamber or unidirectional flow from the central chamber to the drainage cavity.
The number of the plungers is only one, and the pump further includes an upper pump cover and a lower pump cover that are detachably attached to the pump body, and the length extending direction of the plunger is the dichotomized surface. The upper pump cover and the lower pump cover both extend so as to straddle the dichotomized surface in the left-right direction, and the water supply port is provided below the drain port and is provided on the left and right sides. In the direction, the axis of the drain port is located on the dichotomized surface, or the dimension shifted to the left or right from the dichotomized surface is 30% or less of the width of the pump body, and the central chamber. Has an upper cavity formed in the upper pump cover and a lower cavity formed in the lower pump cover, and the transmission mechanism has both ends of the plunger in the upper cavity and the lower cavity, respectively. Drive to reciprocate ,
The check valve unit includes a first water supply valve provided at the upper end of the water supply cavity and a first drain valve provided at the upper end of the drainage cavity, and the first drain valve is a valve body. A check valve located inside the valve body and an urging member for urging the check valve are provided, and the cleaning liquid presses the check valve operably and presses the check valve against the valve. Move in the body,
The drain port is provided close to the check valve, and the vertical distance between the contact surface between the check valve and the valve body and the uppermost end of the drain port is 20 mm or less. Handheld high pressure washer. As before SL on the pump cover is positioned on the upper side of the lower pump cover, the pump is a hand-held pressure washer of claim 1, characterized in that disposed within said housing. The transmission mechanism includes an eccentric mechanism connected to the motor, the central portion of the plunger is recessed inward to form a mounting portion, and the eccentric mechanism is connected to the mounting portion and driven by the motor. The handheld high-pressure washer according to claim 2, wherein the plunger is reciprocated within the pump body. The handheld high-pressure washer according to claim 1, wherein the opening direction of the drain port is substantially perpendicular to the reciprocating movement direction of the plunger, and the drain port is located in front of the plunger. The discharge portion has an outlet for the cleaning liquid to flow out to the outside, the drain port is located between the plunger and the outlet in the front-rear direction, and the opening direction of the drain port is the outlet. The handheld high-pressure washer according to claim 1, wherein the hand-held high-pressure washer is characterized by matching the opening direction of the above. The water outlet and the water inlet is a hand-held pressure washer of claim 3, wherein the benzalkonium arranged on the same side of the plunger. Wherein both the water supply cavity and the drainage cavity is provided in front of the plunger, the water supply cavity and the drainage cavities, handheld according to claim 1, characterized in that it is arranged adjacent to the left-right direction High-pressure washing machine. The extending direction of the water supply cavity and the drainage cavity is parallel to the reciprocating movement direction of the plunger, and the drainage port and the water supply port are both provided in front of the water supply cavity and the drainage cavity, and the drainage port is provided. mouth, opening direction of the water supply port, hand-held pressure washer of claim 1, wherein the waste water cavity is perpendicular to the extending direction of the water supply cavity. The hand-held high-pressure washer further includes a battery pack that supplies power to the motor, the functional member is located at one end of the handle, and the battery pack is located at the other end of the handle. The handheld high pressure washer according to claim 1. The functional member is provided in the main body portion, the main body portion extends substantially in the discharge direction of the cleaning liquid, and the center of gravity G of the handheld high-pressure washer is located between the front end point and the rear end point of the handle. on the handle, to claim 1, characterized in that the angle between the extending direction of the extending direction of the handle main body portion is larger than 90 degrees, it is arranged so as to be 160 degrees or less The handheld high pressure washer described. The discharge portion of the hand-held high-pressure washer is provided with an accessory mounting portion arranged so as to enable a detachable connection with the discharge head, and the discharge head has a spray bar of a predetermined length and a spray. A nozzle connected to one end of the bar is provided, and the parts before the tip point of the handle are used as a spray gun unit, and the parts after and below the rear end point of the handle are used as a power supply unit. , hand-held pressure washer of claim 1, wherein greater than the weight of the power supply unit. The hand-held type according to claim 1 , wherein the vertical distance between the contact surface between the check valve of the first drain valve and the valve body and the uppermost end of the drain port is 5 mm or less. High-pressure washing machine. The moving direction of the check valve of the first drain valve is parallel to the plunger, and in the moving direction of the check valve, the uppermost end of the drain port is in contact with the check valve and the valve body. The hand-held high-pressure washer according to claim 1 , wherein the hand-held high-pressure washer is located below the surface or at substantially the same height as the contact surface between the check valve and the valve body. The pump further comprises a plunger hole for accommodating the plunger, and the plunger hole extends in the vertical direction, passes through a position of half the length of the plunger hole, and has a surface perpendicular to the reciprocating movement direction of the plunger. The present invention is characterized in that the central cross section R in the front-rear direction of the pump is defined, and the lowermost end of the drain port is flush with the central cross section R or is located above the central cross section R in the vertical direction. hand-held pressure washer according to 1.

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