JP2014213295A - High pressure washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel high pressure washer for improving the cooling effect by enhancing a flow speed of cooling water flowing in a cavity, by thinning a cavity layer by adopting a constitution unrequired for providing a partition wall in the cavity.SOLUTION: This high pressure washer 10 comprises an electric motor 12 of becoming a driving source and a pump mechanism 21 for generating high pressure water by pressurizing supplied water by being driven by the electric motor 12, and a cavity 15 for conducting the cooling water for cooling the electric motor 12 is formed in a substantially cylindrical shape so as to surround the outer periphery of the electric motor 12, and a water suction port 16 for introducing the cooling water to the cavity 15 and a water discharge port 17 for deriving the cooling water, are arranged so as to turn in the same direction in the tangent direction and the horizontal direction of the cavity 15 formed in the substantially cylindrical shape.

Description

  The present invention relates to a high-pressure washing machine, and more particularly to an improvement in a mechanism for cooling an electric motor as a drive source.

  2. Description of the Related Art Conventionally, there is known a high pressure washer that can remove dirt stuck to a floor, a wall, or concrete by spraying water with a strong pressure. A general high-pressure washing machine has an electric motor as a driving source and a pump mechanism that generates high-pressure water by driving the supplied water by pressurizing the supplied water, and is supplied from the water inlet. The water to be discharged is pressurized by a pump mechanism driven by an electric motor to become high-pressure water, and the high-pressure water is discharged through a water discharge port and a water discharge device (nozzle gun or the like).

  In such a conventional high pressure washer, various mechanisms for cooling an electric motor as a drive source have been proposed. For example, Patent Document 1 below discloses an electric pump unit including a water-cooling type cooling mechanism that cools an electric motor with cooling water.

Chinese Patent Application No. 101663483

  In the conventional cooling mechanism disclosed in Patent Document 1 listed above, a configuration is adopted in which a cavity serving as a space for introducing cooling water is provided around the electric motor, and a partition wall is formed inside the cavity. It was. In the prior art, since a water inlet for supplying cooling water to the cavity and a water outlet for discharging cooling water are installed adjacent to each other, a partition wall is not provided between the water inlet and the water outlet. By providing it, the cooling water was suitably circulated in the cavity. In addition, in the related art, generally, a partition wall is provided in the cavity as a measure for circulating the cooling water in all the areas in the cavity.

  However, when the partition wall is provided in the cavity as in the prior art, there is a problem that the cavity layer becomes thick. That is, since the high-pressure water used in the high-pressure washing machine has a small discharge flow rate, when the cavity layer becomes thick, the flow rate of the cooling water flowing in the cavity is lowered, and the heat exchange rate is lowered. Further, when the cavity layer becomes thick, various problems such as air remaining in the cavity and draining work performed after using the high-pressure washer are required.

  The present invention has been made in order to solve the various problems existing in the above-described prior art, and an object of the present invention is to adopt a configuration in which a partition wall is not required to be provided in the cavity. An object of the present invention is to provide an unprecedented high-pressure washing machine that has been made thinner and thus has improved the cooling effect by increasing the flow rate of cooling water flowing in the cavity.

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

  A high pressure washer (10) according to the present invention is driven by an electric motor (12) serving as a driving source and a pump that generates high pressure water by pressurizing supplied water by being driven by the electric motor (12). A high-pressure washing machine (10) comprising a mechanism (21), wherein a cavity (15) for conducting cooling water for cooling the electric motor (12) surrounds an outer periphery of the electric motor (12). The cavity (16) is formed into a substantially cylindrical shape, and the water suction port (16) for introducing cooling water into the cavity (15) and the water discharge port (17) for deriving cooling water have a substantially cylindrical shape ( 15) is arranged so as to be horizontal and facing in the tangential direction, and the water inlet (16) and the water outlet (17) are separated in the axial direction of the cavity (15) having a substantially cylindrical shape. Features that are provided It is intended to.

  Moreover, in the high-pressure washing machine (10) according to the present invention, the water suction port (16) is provided at the lower portion on the one axial end side of the cavity (15) having a substantially cylindrical shape, and the water discharge port ( 17) may be provided.

  Furthermore, the high pressure washer (10) according to the present invention includes a hose reel (31) that winds up a hose (30) connected to the pump mechanism (21), the electric motor (12), and the pump mechanism (21). ), And a housing (51) for housing the hose reel (31), and when in a self-supporting state, the electric motor (12) and the pump mechanism (21) are positioned below the housing (51). The hose reel (31) can be arranged side by side and at a position above the housing (51).

  According to the present invention, since it is possible to employ a configuration that does not require a partition wall in the cavity, it is possible to reduce the thickness of the cavity layer, thereby increasing the flow rate of the cooling water flowing in the cavity and increasing the cooling effect. It is possible to provide an unprecedented high-pressure washing machine that realizes improvement.

It is the appearance perspective view showing the whole high-pressure washing machine composition concerning this embodiment. It is an external appearance front view of the high-pressure washing machine concerning this embodiment. It is a figure which shows the state which removed the front side of the housing | casing which comprises the outline of the high pressure washing machine which concerns on this embodiment. It is a longitudinal cross-sectional front view for demonstrating the internal structure of the high-pressure washing machine which concerns on this embodiment. It is the front view which showed the principal part of the motor unit and pump mechanism which concern on this embodiment. It is sectional drawing which shows the VI-VI cross section in FIG. It is sectional drawing which shows the VII-VII cross section in FIG. It is a schematic diagram for demonstrating the conduction | electrical_connection state of the cooling water in this embodiment.

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

  FIG. 1 is an external perspective view showing the overall configuration of the high pressure washer according to this embodiment, and FIG. 2 is an external front view of the high pressure washer according to this embodiment. Moreover, FIG. 3 is a figure which shows the state which removed the front side of the housing | casing which comprises the outline of the high pressure washing machine which concerns on this embodiment, and FIG. 4 shows the internal structure of the high pressure washing machine which concerns on this embodiment. It is a longitudinal cross-sectional front view for demonstrating.

  As shown in FIG. 3, the high-pressure washer 10 according to the present embodiment is driven by the motor unit 11 in which the electric motor 12 serving as a driving source is housed and the electric motor 12, thereby supplying water to be supplied. A pump mechanism 21 for generating high-pressure water by pressurization and a hose reel 31 for winding a hose 30 connected to the pump mechanism 21 are provided.

  The motor unit 11 houses an electric motor 12 that is rotationally driven by external power supplied from a power source (not shown). The electric motor 12 includes a rotor 13 as a field magnetic flux generation source and a stator 14 for generating a rotating magnetic field for rotating the rotor 13. The rotor 13 includes a motor shaft 13a, and a swash plate 13b is attached to the tip of the motor shaft 13a. The electric motor 12 exhibits a function as a drive source by transmitting the rotational movement of the swash plate 13b to a pump mechanism 21 described later. On the other hand, the stator 14 is fixedly installed in the motor unit 11.

  The pump mechanism 21 is a member that is connected to the motor unit 11 via the swash plate 13b so that power can be transmitted. In the pump mechanism 21 according to the present embodiment, three pistons 22 that reciprocate in a substantially horizontal direction are installed in contact with a thrust bearing 13c embedded in an inclined surface on the shaft end surface side of the swash plate 13b. Yes. The three pistons 22 are provided with springs 22a, and an elastic force is always applied to the thrust bearing 13c side by the action of the springs 22a (that is, the right direction in FIG. 4), and the springs 22a. The piston 22 is configured to move to the left when a lateral force (left direction in FIG. 4) against the elastic force is applied. That is, each of the three pistons 22 is configured to perform reciprocating piston movement in a substantially horizontal direction (left-right direction).

  The pump inner region 23 where the thrust bearing 13c embedded in the swash plate 13b and the three pistons 22 are in contact with each other is filled with lubricating oil, and a good contact state between the thrust bearing 13c and the three pistons 22 is obtained. It is configured to be realized. Therefore, when the electric motor 12 is driven and the motor shaft 13a is rotationally driven, the swash plate 13b is rotationally driven by this rotational driving force. When the swash plate 13b is rotationally driven, the shaft of the swash plate 13b is driven. Since the thrust bearing 13c is rotated by the action of the inclined surface formed on the end surface side, the three pistons 22 are sequentially pushed in the anti-swash plate direction (the left side in FIG. 4) by the thrust bearing 13c. At the same time, the pushing in this direction is released, and the three pistons 22 perform reciprocating piston movement in order.

  Water sent through the water inlet 16 described later is guided to the tip of the three pistons 22. The water guided to the left position of the installation location of the three pistons 22 is pressurized by the action of the reciprocating piston movement by the pistons 22 to generate high-pressure water.

  The high-pressure water generated by being pressurized by the pump mechanism 21 is guided to the hose 30 connected to the pump mechanism 21 and used for high-pressure washing work to the outside. The high pressure washer 10 according to this embodiment includes a hose reel 31 for winding the hose 30, and the length of the hose 30 can be adjusted according to the working environment. The hose reel 31 is provided with a handle 32 so that the reel can be easily rotated. The handle 32 can be taken out and stored in the casing 51, so that the operability of the high-pressure washing machine 10 is improved and the apparatus is made compact.

  The motor unit 11, the pump mechanism 21, and the hose reel 31 described above are housed and installed in a housing 51 that constitutes the outline of the high pressure washer 10. The housing 51 is configured by combining the front and rear half members constituting the front side and the rear side. Further, a grip 52 is formed at the upper center position of the casing 51, and a pair of left and right tires 53 are formed at the lower rear position. Since the high pressure washer 10 according to the present embodiment is configured so that the center of gravity is slightly forward when in the self-standing state illustrated in FIGS. 1 to 4, the pair of left and right tires 53 do not function. Therefore, it is possible to maintain a stable and independent state. In addition, when the user moves, the user holds the grip portion 52 and tilts backward so that the pair of left and right tires 53 positioned at the lower rear of the housing 51 can be rotated, so the grip portion 52 is tilted rearward. However, the high-pressure washing machine 10 can be easily moved by pulling backward.

  Further, in the high pressure washer 10 according to the present embodiment, the motor unit 11 having the electric motor 12 and the pump mechanism 21 are arranged side by side in the lower position of the casing 51 and the upper position of the casing 51 in the self-standing state. A hose reel 31 is arranged on the front side. That is, the motor unit 11 and the pump mechanism 21 which are heavy objects are disposed at a position below the casing 51, and the hose reel 31 having a relatively smaller weight than these is disposed at a position above the casing 51. Therefore, the high pressure washer 10 according to the present embodiment has a very good weight balance, and a stable self-supporting state can be realized. Moreover, since the hose reel 31 having the handle 32 that receives an operation when the hose 30 is taken in and out from the user is disposed on the upper side of the housing 51, high operability is realized.

  In addition, about the motor unit 11 and the pump mechanism 21 of this embodiment, in order to maintain the stable installation state in the housing | casing 51, with respect to the housing | casing 51 opposing surface of the motor unit 11 and the pump mechanism 21, respectively. A support portion 55 connected to the inner surface side of the casing 51 is formed. As shown in FIG. 3, the support portion 55 of the present embodiment is formed as a cylindrical convex portion, and is a recess (non-removable) for storing the support portion 55 provided on the inner surface side of the housing 51. The motor unit 11 and the pump mechanism 21 in the housing 51 are stably installed by being fitted with each other. In addition, about the shape of this support part 55 and the recessed part by the side of the housing | casing 51 for accommodating the support part 55, all shapes are employable. Further, for the support portion 55, it is preferable to employ an elastic member in order to obtain effects such as vibration isolation and sound insulation.

  The basic configuration of the high pressure washer 10 according to the present embodiment has been described above. Next, the motor cooling mechanism provided in the high-pressure washing machine 10 according to the present embodiment will be described by adding FIGS. 5 to 8 to the reference drawings. Here, FIG. 5 is a front view showing the main parts of the motor unit and the pump mechanism according to the present embodiment. 6 is a cross-sectional view showing a VI-VI cross section in FIG. 5, and FIG. 7 is a cross-sectional view showing a VII-VII cross section in FIG. Furthermore, FIG. 8 is a schematic diagram for explaining the conduction state of the cooling water in the present embodiment.

  As shown in FIG. 4, the motor unit 11 according to the present embodiment is formed with a cavity 15 through which cooling water for cooling the electric motor 12 is conducted so as to surround the outer periphery of the electric motor 12. The cavity 15 is in contact with the stator 14 and is disposed so as to surround the stator 14 and a metal inner casing 15a, and an outer side disposed so as to surround the outer periphery of the inner casing 15a. The casing 15b is formed so as to have a substantially cylindrical shape.

  The inner casing 15a is made of a metal having high thermal conductivity such as an aluminum alloy, for example, in order to efficiently transfer the heat transmitted from the stator 14 to the cooling water in the cavity 15. Further, an O-ring 15c is installed between the inner casing 15a and the outer casing 15b in order to surely prevent leakage of cooling water from the cavity 15. In the present embodiment, two O-rings 15c are installed.

  Furthermore, in this embodiment, the partition wall which prescribes | regulates the conduction path of a cooling water does not exist in the inside of the cavity 15 mentioned above. Then, next, the suitable structure of this embodiment which can exhibit the efficient cooling effect, without forming the partition wall essential by the prior art is demonstrated.

  That is, as shown in FIGS. 5 to 7, in the motor unit 11 according to the present embodiment, the water suction port 16 is provided at the lower portion on one axial end side of the substantially cylindrical cavity 15, and the upper portion on the other axial end side is provided. A water outlet 17 was provided. The adoption of such a configuration is apparent from the schematic diagram shown in FIG. 8, but from the water inlet 16 provided at the lower end on the one axial end side of the substantially cylindrical cavity 15 (in the direction of α). While introducing the cooling water and deriving the cooling water (in the direction of the symbol β) from the water discharge port 17 provided at the upper part on the other end side in the axial direction, the cooling water is efficiently obtained in the cavity 15 having a substantially cylindrical shape. The heat of the electric motor 12 (stator 14) that circulates as a swirl flow and is transmitted from the inner casing 15a can be efficiently carried out of the cavity 15. In addition, while providing the water absorption port 16 in the axial direction one end lower part of the substantially cylindrical cavity 15, the cooling water in the cavity 15 circulates without stagnation by providing the water discharge port 17 in the axial other end side upper part. In other words, a cooling water stop region is unlikely to be generated inside the cavity 15 of the present embodiment, so that an efficient cooling effect can be obtained without a partition wall as in the prior art.

  Further, since the cavity 15 according to the present embodiment does not need to be provided with a partition wall, the cavity layer can be formed thinner than in the conventional technique. Therefore, according to the present embodiment, the cooling water conducted through the cavity 15 circulates at a low flow rate at a high flow rate, so that a very high cooling effect can be obtained efficiently. Yes.

  Furthermore, since the cavity 15 according to the present embodiment is formed as a thin cavity layer, the air hardly remains in the interior, and the cooling effect is further improved. Furthermore, since the amount of cooling water stored in the cavity can be reduced by making the cavity layer thinner, various suitable operations such as being able to complete the draining operation at the end of the operation in a short time, for example. It is possible to obtain an advantageous effect.

  In addition, in this embodiment, while providing the water inlet 16 in the axial direction one end side lower part of the substantially cylindrical cavity 15, the structure which provided the water discharge port 17 in the axial direction other end side upper part was employ | adopted. However, various changes can be added to the scope of the present invention as long as the above-described effects can be exhibited. Specifically, the water inlet 16 for introducing the cooling water into the cavity 15 and the water outlet 17 for leading the cooling water are horizontally and in the tangential direction of the substantially cylindrical cavity 15. It is preferable to arrange so as to face the direction. Further, it is preferable that the water suction port 16 and the water discharge port 17 are separated from each other in the axial direction of the substantially cylindrical cavity 15. By providing these configurations, it is possible to realize a cooling mechanism that achieves the same high cooling effect as the above-described embodiment.

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

  For example, the formation range, shape, and the like of the cavity 15 can be appropriately changed according to the shape of the electric motor 12.

  Further, for example, the positional relationship between the water inlet 16 and the water outlet 17 can be reversed from the case of the present embodiment.

  In addition, for example, the number and position of the support portions 55 for stably installing the motor unit 11 and the pump mechanism 21 in the casing 51 can be arbitrarily changed within a range in which similar effects can be obtained. Is possible. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 High pressure washing machine, 11 Motor unit, 12 Electric motor, 13 Rotor, 13a Motor shaft, 13b Swash plate, 13c Thrust bearing, 14 Stator, 15 Cavity, 15a Inner casing, 15b Outer casing, 15c O-ring, 16 water intake port, 17 water discharge port, 21 pump mechanism, 22 piston, 22a spring, 23 pump inner area, 30 hose, 31 hose reel, 32 handle, 51 housing, 52 gripping part, 53 tire, 55 support part.

Claims (3)

An electric motor as a drive source;
A pump mechanism that generates high-pressure water by pressurizing supplied water by being driven by the electric motor;
In a high pressure washer comprising
A cavity for conducting cooling water for cooling the electric motor is formed in a substantially cylindrical shape so as to surround the outer periphery of the electric motor,
A water intake port for introducing cooling water into the cavity and a water discharge port for deriving cooling water are arranged so as to be horizontally and in the same direction in the tangential direction of the cavity having a substantially cylindrical shape,
The high-pressure washing machine, wherein the water suction port and the water discharge port are provided apart from each other in the axial direction of the cavity having a substantially cylindrical shape. In the high-pressure washing machine according to claim 1,
The high-pressure washing machine, wherein the water suction port is provided at a lower portion on one axial end side of the cavity having a substantially cylindrical shape, and the water discharge port is provided at an upper portion on the other axial end side. In the high-pressure washing machine according to claim 1 or 2,
A hose reel for winding a hose connected to the pump mechanism;
A housing for housing the electric motor, the pump mechanism, and the hose reel;
With
The high-pressure washing machine, wherein the electric motor and the pump mechanism are arranged side by side at a lower position of the casing and the hose reel is disposed at an upper position of the casing in a self-standing state.

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