JP2022173691A - Ultrasonic cleaning device and throttle pipe - Google Patents

Abstract

To provide an ultrasonic cleaning device facilitating attaching or detaching a flow channel throttle part for generating bubbles of dissolved gases in liquid.SOLUTION: An ultrasonic cleaning device includes a throttle pipe 40 as a flow channel throttle part disposed in a state that the whole thereof is inserted into a pipe 10b at a suction side of a pump for circulating liquid in a tank. The throttle pipe 40 has projections 405 projecting from an outlet part 403 of a throttle flow channel 401 to a rear side. The plurality of projections 405 are disposed so as to project from a partial section in the circumferential direction of the throttle pipe 40 to a rear side, and are disposed at intervals in the circumferential direction. Tips 405a of the projections 405 are positioned in a suction port 51 of the pump. An inlet part 402 of the throttle pipe 40 is formed in a tapered shape. A surface 403a of the outlet part 403 is formed on a surface at an angle close to a surface perpendicular to a center axis L of the throttle pipe 40 from the inlet part 402. The pipe 10b at a suction side is formed from a material having light transmissivity.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to an ultrasonic cleaning device.

Conventionally, in ultrasonic cleaning in which an object to be cleaned immersed in a liquid in a bath is cleaned with ultrasonic waves, there has been proposed a method of degassing the liquid for the purpose of reducing the attenuation of ultrasonic vibration due to dissolved gas ( For example, see Patent Document 1). In Patent Document 1, a throttling portion of a flow path is provided in front of a pump that circulates the liquid in a tank, and bubbles (bubbles) of gas dissolved in the liquid are generated by the throttling portion, and the bubbles are generated on the discharge side of the pump. It is described that a gas-liquid separation tank for floating separation is provided.

JP-A-7-328316

In the degassing method of generating air bubbles by throttling the flow path, air bubbles may not be effectively generated at the throttling portion depending on the performance of the pump, the degree of throttling of the flow path, and the like. In this case, for example, the constricted portion may be replaced with another constricted portion having a different shape such as an inner diameter. In this case, it is desirable that the diaphragm can be attached or detached easily. Moreover, even when it is desired to add a degassing function to an existing ultrasonic cleaning device that does not have a degassing function, it is desirable that the constricted portion can be easily attached to the ultrasonic cleaning device.

In this regard, in the conventional ultrasonic cleaning apparatus to which the degassing method such as that disclosed in Patent Document 1 is applied, the suction-side pipe, which is the suction-side pipe of the pump, is narrowed by providing a narrowed portion in the middle of the suction-side pipe. , and connection points with the suction-side pipe are generated on both sides of the inlet side and the outlet side of the throttling section. Since the throttle section and the suction-side pipe are connected at the connection point by welding, bolts, or the like, the throttle section cannot be attached or removed easily.

The present disclosure has been made in view of the above problems, and an object thereof is to provide an ultrasonic cleaning apparatus and a throttle tube as the throttle section, which can easily attach or detach the throttle section.

The ultrasonic cleaning device of the present disclosure is
a tank containing a liquid and an object to be cleaned;
an ultrasonic transducer provided inside the tank;
a pump provided outside the tank for circulating the liquid in the tank;
a connecting tube connecting the tank and the pump;
a throttle pipe that is provided in front of the suction port of the pump and generates bubbles of gas dissolved in the liquid on the rear side by narrowing the cross-sectional area of the flow path of the liquid,
Using the connection pipe connecting the suction port and the tank as a suction side pipe,
The throttle tube is provided in a state in which the entire throttle tube is inserted into the suction side tube, and has a protruding portion that protrudes rearward from an outlet of a throttle channel formed in the throttle tube. ,
The protruding portion is positioned at the suction port and is formed in a shape that communicates from the side with the air bubble generation region on the rear side of the outlet portion.

According to this, the throttle pipe as the throttle portion is provided in a state in which the whole is inserted into the suction side pipe, and the throttle pipe can be mounted without using fastening members such as welding and bolts. Therefore, it is possible to easily attach or detach the throttle tube. In addition, the throttle tube has a projection projecting rearward from the outlet of the flow path of the throttle tube, and the projection is positioned at the suction port of the pump. can be accurately positioned closer to the pump. In this way, by providing the throttle pipe at a position where the suction force of the pump is stronger, it is possible to effectively generate air bubbles by cavitation behind the throttle pipe. Furthermore, since the projecting portion is formed in a shape that communicates with the air bubble generation region from the side, when the suction side pipe is formed of a translucent material, the air bubble generation region can be visually observed through the suction side pipe. . As a result, it is possible to accurately determine the state of bubble generation in the throttle pipe, and if bubbles are not effectively generated, it is possible to take measures such as replacing with another throttle pipe.

In addition, the throttle tube of the present disclosure is
A throttle tube forming a throttle channel for generating bubbles of gas dissolved in the liquid on the rear side,
having a protruding portion protruding rearward from the outlet portion of the throttle channel,
The projecting portion is formed in a shape that communicates from the side with the air bubble generation region on the rear side of the outlet portion,
The entire throttle pipe is inserted into the pipe on the suction side of the pump that circulates the liquid of the ultrasonic cleaning device, and the protruding part is used so as to be positioned at the suction port of the pump.

By incorporating the throttle pipe of the present disclosure into the ultrasonic cleaning device, it is possible to obtain the same effects as the above-described effects of the ultrasonic cleaning device of the present disclosure.

FIG. 4 is a cross-sectional view of the ultrasonic cleaning apparatus taken along line II of FIG. 3; FIG. 4 is a cross-sectional view of the ultrasonic cleaning device taken along line II-II of FIG. 3; 1 is a schematic plan view of an ultrasonic cleaning device; FIG. 3 is an enlarged view of part A of FIG. 2; FIG. It is a schematic perspective view of an outer case. FIG. 4 is a cross-sectional view of a suction side pipe and a throttle pipe inserted therein; It is a side view of a throttle tube. It is the figure which looked at the throttle pipe from the entrance part side. It is the figure which looked at the throttle pipe from the exit part side.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. An ultrasonic cleaning apparatus 1 shown in FIGS. 1 to 3 includes a bath 2, an outer case 3, an ultrasonic vibrator 4, and a pump 5. As shown in FIG. The tank 2 is made of stainless steel (SUS), for example. The tank 2 has a side plate 21 forming a side surface parallel to the vertical direction, and a bottom plate 22 forming a bottom surface parallel or inclined in the horizontal direction perpendicular to the vertical direction. The bottom plate 22 has a bottom plate 22a for a first space 25 (washing space) and a bottom plate 22b for a second space 26, which will be described later. The side plates 21 are arranged so as to form a right-angled square in plan view shown in FIG. The bottom plate 22 is connected to the lower ends of the side plates 21 . The upper end of the side plate 21 forms a rectangular rectangular opening in a plan view of FIG. The ultrasonic cleaning apparatus 1 includes a lid 7 (see FIGS. 1 and 2) that closes the opening of the bath 2. As shown in FIG. Lid 7 is provided so that it can be opened and closed.

The tank 2 has a bent portion 23 bent horizontally outward from the upper end of the side plate 21 . The bent portion 23 forms an outer edge of a right-angled square similar to the opening formed at the upper end of the side plate 21 when viewed from above in FIG. The bent portion 23 is supported on the upper end of the outer case 3 with the silicon 8 (see FIGS. 1 and 2) interposed therebetween.

The side plate 21 (excluding the bent portion 23 ) and the bottom plate 22 of the tank 2 are not in contact with the outer case 3 . That is, a gap is formed between the side plate 21 and the bottom plate 22 and the outer case 3 . More specifically, a gap is formed between the side plate 21 and the side plate 32 of the outer case 3 facing it. Further, the outer case 3 is not provided with a bottom plate. Therefore, the bottom plate 22 of the bath 2 is exposed to the ground surface of the outer case 3 (ultrasonic cleaning device 1), and a gap is formed between the bottom plate 22 and the ground surface. In this manner, the tank 2 is supported by the outer casing 3 only at the upper portion (bending portion 23).

Moreover, the tank 2 is equipped with the partition plate 24 inside. The partition plate 24 is provided so as to form a partition surface (flat surface) parallel to the vertical direction. Two spaces 25 and 26 are formed inside the tank 2 by the partition plate 24 . The spaces 25 and 26 are formed so as to be horizontally aligned with the partition plate 24 interposed therebetween. The first space 25 is a space (hereinafter sometimes referred to as a cleaning space) for containing the ultrasonic transducer 4 and an object to be cleaned (not shown). The second space 26 is a space for storing the liquid overflowing the partition plate 24 from the washing space 25 .

The side plate 21 of the tank 2 has a continuous side plate 21a (see FIG. 1) forming a plane continuous with the partition plate 24 downward from the lower end 242 (see FIG. 1) of the partition plate 24 . The partition plate 24 and the continuous side plate 21a are composed of a single flat plate. The continuous side plate 21 a forms part of the side surface of the washing space 25 .

The cleaning space 25 is defined as a rectangular parallelepiped space by the side plate 21 , the bottom plate 22 a and the partition plate 24 . The bottom plate 22a of the cleaning space 25 is provided so as to form a bottom surface perpendicular to the vertical direction and parallel to the horizontal direction. Also, the bottom plate 22 a is provided below the bottom plate 22 b of the second space 26 . The washing space 25 is formed so as to accommodate a large object to be washed (for example, a wheel of a car). Specifically, the height H1 (see FIG. 1) of the cleaning space 25 is set to, for example, 500 mm or more and 1000 mm or less. A longitudinal width X1 (see FIG. 3) of the cleaning space 25 in the horizontal direction is set to, for example, 500 mm or more and 1000 mm or less. A lateral width Y (see FIG. 3) of the cleaning space 25 in the horizontal direction is set to, for example, 300 mm or more and 700 mm or less. Also, the height H2 (see FIG. 1) from the bottom plate 22a of the cleaning space 25 to the upper end 241 of the partition plate 24 is set lower than the height H1 of the cleaning space 25, for example, 500 mm or more and 900 mm or less. The height H2 corresponds to the height of the liquid surface W1 when the washing space 25 is filled with liquid to the maximum.

A liquid circulation hole 27 is formed in the lower part of the cleaning space 25 to allow the liquid to flow into or out of the cleaning space 25 . The liquid circulation hole 27 is provided in the lower part of the continuous side plate 21a provided continuously with the partition plate 24. As shown in FIG. More specifically, the liquid circulation hole 27 is formed at a position closer to the bottom surface 22a of the cleaning space 25 than to the bottom surface 22b of the second space 26 in the height direction (vertical direction of the paper surface of FIGS. 1 and 2). ing. Also, the liquid circulation hole 27 is provided below the discharge port 52 (see FIG. 2) of the pump 5 . In this embodiment, the liquid circulation holes 27 are provided below the main body of the pump 5 . The liquid circulation hole 27 is provided below a liquid circulation hole 28 (see FIGS. 1 to 3) formed in the second space 26, which will be described later.

The second space 26 is defined as a substantially rectangular parallelepiped space by the side plate 21 , the bottom plate 22 b and the partition plate 24 . The second space 26 is set smaller than the cleaning space 25 . Specifically, the bottom surface 22 b of the second space 26 is provided at a position higher than the bottom surface 22 a of the cleaning space 25 . A height H3 from the bottom surface 22b of the second space 26 to the upper end 241 of the partition plate 24 is smaller than the heights H1 and H2 of the cleaning space 25 described above. Further, the width X2 (see FIG. 3) of the second space 26 in the direction parallel to the longitudinal width X1 of the cleaning space 25 is smaller than the longitudinal width X1. The width of the second space 26 in the direction perpendicular to the width X2 in the horizontal direction is the same as the width Y of the cleaning space 25 in the transverse direction.

The bottom plate 22b of the second space 26 is provided in a state slightly inclined with respect to the horizontal direction (see FIG. 2). Specifically, as shown in FIG. 2, the bottom plate 22b extends from one end 22b1 to the other end 22b2 in the lateral direction of the tank 2 (in other words, the extending direction of the upper end 241 of the partition plate 24). It is provided so as to be gradually displaced downward as it approaches .

The bottom plate 22b is formed with a liquid flow hole 28 through which the liquid flows out from the second space 26. As shown in FIG. As shown in FIG. 2, the liquid circulation hole 28 is formed at a position closer to the lower end 22b2 than the upper end 22b1 of both ends 22b1 and 22b2 in the inclination direction of the bottom plate 22b. More specifically, the liquid flow hole 28 is formed at a position closer to the lower end 22b2 than the intermediate position between the upper end 22b1 and the lower end 22b2 in the inclination direction of the bottom plate 22b. It is Also, the liquid circulation hole 28 is provided above the suction port 51 (see FIG. 2) of the pump 5 . In this embodiment, the liquid circulation hole 28 is provided above the main body of the pump 5 . Further, the liquid circulation holes 28 are provided above the liquid circulation holes 27 of the cleaning space 25 .

The ultrasonic cleaning device 1 has a filter 30 for removing dirt such as oil in the liquid (see FIG. 1). The filter 30 is a sponge filter made of urethane, for example, and is provided in a floating state on the liquid surface W2 (see FIG. 1) of the liquid stored in the second space 26 .

Here, the direction perpendicular to both the plate thickness direction and the vertical direction of the partition plate 24 is defined as the width direction of the partition plate 24 (horizontal direction in FIG. 2). Both ends 243 and 244 in the width direction of the partition plate 24 are connected to the side plate 21 of the tank 2 at right angles.

An upper end 241 of the partition plate 24 is formed to extend parallel to the horizontal direction. Also, the upper end 241 is located below the upper bent portion 23 of the tank 2 . A groove 245 recessed downward is formed in the upper end 241 (see FIG. 4). The grooves 245 are repeatedly (plurally) formed at intervals d3 along the width direction (extending direction) of the upper end 241 . The groove 245 has end grooves 245a positioned at both ends in the width direction of the upper end 241 and grooves 245b (referred to as inner grooves) other than the end grooves 245a. Each inner groove 245b is formed in the same V shape. The width d1 of the inner groove 245b in the width direction of the upper end 241 is, for example, equal to the width d3 of the flat portion 246 formed between the plurality of inner grooves 245b in the width direction. However, the width d1 of the inner groove 245b is not limited to this, and the width d1 of the flat portion 246 may be larger or smaller than the width d3. The depth d2 of the inner groove 245b is smaller than the width d1 of the inner groove 245b, for example. However, it is not limited to this, and the depth d2 of the inner groove 245b may be equal to the width d1 or may be greater than the width d1.

The end groove 245a is formed in a shape (inclined linear shape) that is half the shape (V-shape) of the inner groove 245b. A bottom portion 245 a 1 of the end groove 245 a is in contact with the side plate 21 . The depth of the end groove 245a is equal to the depth d2 of the inner groove 245b. That is, the bottom portion 245a1 of the end groove 245a and the bottom portion 245b1 of the inner groove 245b are provided at the same height position.

A portion 246 (flat portion) formed between the grooves 245 is formed in a straight line parallel to the width direction of the partition plate 24 when viewed from the direction of FIG.

The outer case 3 is made of stainless steel (SUS), for example. The outer box 3 is provided so as to surround the tank 2 . Specifically, as shown in FIG. 5 , the outer box 3 includes a rectangular parallelepiped outer frame portion 31 and side plates 32 that close the sides of the space surrounded by the outer frame portion 31 . The outer frame portion 31 is composed of a square pipe. The outer frame portion 31 includes an upper horizontal frame portion 311 that forms a rectangular rectangular frame in plan view and is provided in parallel with the upper horizontal frame portion 311 below the upper horizontal frame portion 311 in plan view. and a lower horizontal frame portion 312 forming a right-angled square frame, and provided vertically to the upper and lower horizontal frame portions 311 and 312, between the corners of the upper horizontal frame portion 311 and the corners of the lower horizontal frame portion 312. and a connecting vertical frame portion 313 .

The upper bent portion 23 of the tank 2 is connected to the upper horizontal frame portion 311 via the silicon 8 . As a result, the outer case 3 supports the tub 2 .

A housing space 500 for the pump 5 is formed inside the outer casing 3 and outside the tank 2 (see FIGS. 1 and 2). Of the side plates 32 of the outer casing 3, a side plate 32a (see FIGS. 1 and 5) provided at a position that closes the pump housing space 500 is provided so as to be openable and closable. Therefore, when the side plate 32a is opened, the pump accommodation space 500 and the pump 5 provided therein are visible from the outside. Alternatively, the pump accommodation space 500 may be exposed to the outside at all times without providing the side plate 32a.

The outer box 3 also has four casters 33 . Each caster 33 is attached near the corner of the lower horizontal frame portion 312 .

The ultrasonic transducer 4 is placed on the bottom surface 22 a of the cleaning space 25 . The ultrasonic transducer 4 is a member that oscillates ultrasonic waves when supplied with electric power. The ultrasonic oscillation frequency of the ultrasonic transducer 4 is, for example, 40 kHz. Further, the ultrasonic oscillation output of the ultrasonic transducer 4 can be adjusted by a control section 90 which will be described later. Also, the ultrasonic transducer 4 is detachably provided in the cleaning space 25 .

The ultrasonic cleaning apparatus 1 includes a protective frame 6 (see FIG. 1) for protecting the ultrasonic transducer 4. As shown in FIG. The protective frame 6 is placed on the bottom plate 22 a of the cleaning space 25 while covering the ultrasonic transducer 4 . The protective frame 6 has an upper covering portion 6a that covers the upper side of the ultrasonic transducer 4 so as to form a gap with the upper surface of the ultrasonic transducer 4. The upper covering portion 6a is made of, for example, a metal mesh. formed and arranged horizontally. By placing the object to be cleaned on the upper cover portion 6a, the object to be cleaned and the ultrasonic transducer 4 are prevented from coming into contact with each other.

The pump 5 is a pump for circulating the liquid in the tank 2 , more specifically, a pump for sucking the liquid in the second space 26 and sending the sucked liquid to the washing space 25 . The pump 5 is, for example, a centrifugal pump, and is a high-head pump (eg, a maximum head of 10 m or more). The pump 5 is arranged in the pump housing space 500 . Specifically, as shown in FIG. 1 , the pump support portion 510 is attached to the side plate 21 a facing the space 500 in the pump housing space 500 . The pump 5 is attached to this pump support 510 . Thus, the pump 5 is attached to the side plate 21a via the pump support portion 510. As shown in FIG. Also, the pump 5 is provided at a position lower than the liquid circulation hole 28 of the second space 26 and at a position higher than the liquid circulation hole 27 of the washing space 25 . The pump 5 has a suction port 51 and a discharge port 52 as shown in FIG.

The ultrasonic cleaning apparatus 1 also includes pipes 10, 11, and 12 connecting the pump 5 and the tank 2, and valves 13 to 16 provided in the middle of the pipes 10, 11, and 12 (Fig. 1, See Figure 2). 2, the illustration of the valves 13 to 16 is omitted. The first tube 10 is a suction side tube that connects between the liquid circulation hole 28 of the second space 26 and the suction port 51 of the pump 5 . As shown in FIG. 2, the suction pipe 10 has an upstream portion 10a and a downstream portion 10b. The upstream portion 10a is configured as a metal rigid tube. One end of the upstream portion 10a is connected to the liquid flow hole 28 of the second space 26, and the other end is connected to one end of the downstream portion 10b. The downstream portion 10b is configured as a soft tube made of a soft material such as resin. Further, the downstream portion 10b is made of a translucent material. The degree of translucency of the downstream portion 10b may be such that bubbles (microbubbles) generated on the rear side of the later-described throttle tube 40 can be seen from the outside of the downstream portion 10b. The visible light transmittance of 10b is 10% or more. One end of the downstream portion 10 b is connected to the upstream portion 10 a and the other end is connected to the suction port 51 of the pump 5 . In addition, below, the downstream part 10b may be called a suction side tube.

The second pipe 11 is a discharge side pipe that connects between the discharge port 52 of the pump 5 and the liquid circulation hole 27 of the washing space 25 . The discharge-side pipe 11 has a branch portion 11 d that branches in two directions on the way, and the end of the portion 11 b that forms one of the flow paths after the branch is connected to the liquid flow hole 27 of the cleaning space 25 . there is The end of the portion 11c forming the other channel after branching is open to the outside.

The third pipe 12 is provided so as to branch off from the upstream portion 10a of the suction side pipe 10 . One end of the tube 12 is connected to the upstream portion 10a, and the other end is open to the outside.

The first valve 13 is provided on the suction side pipe 10 , specifically, on the upstream side portion 10 a of the suction side pipe 10 downstream of the connecting portion with the third pipe 12 . The first valve 13 is configured as a valve for manually switching opening and closing of the flow path of the upstream portion 10a.

The second valve 14 is provided on the discharge-side pipe 11 , specifically, on the upstream side of the branch portion 11 d of the discharge-side pipe 11 . The second valve 14 is configured as a valve for manually switching opening and closing of the flow path on the upstream side of the branch portion 11 d of the discharge-side pipe 11 .

The third valve 15 is provided on the discharge-side pipe 11, and more specifically, is provided on a post-branch portion 11c of the discharge-side pipe 11 whose end is open to the outside. The third valve 15 is configured as a valve for manually switching opening and closing of the flow path of the post-branch portion 11c.

A fourth valve 16 is provided on the third tube 12 . The fourth valve 16 is configured as a valve for manually switching opening and closing of the channel of the third tube 12 .

The ultrasonic cleaning apparatus 1 has a throttle tube 40 (see FIGS. 6 to 9). The throttle tube 40 is a member for generating bubbles of gas (oxygen, nitrogen, carbon dioxide, etc.) dissolved in the liquid in the tank 2 to deaerate the liquid. The throttle tube 40 is provided in a state in which the entire throttle tube 40 is inserted into the downstream portion 10b of the suction side tube 10 (see FIG. 6). The throttle tube 40 is formed in a cylindrical shape, for example, from a hard resin such as vinyl chloride. Further, although the throttle tube 40 is made of, for example, an impermeable material (opaque material), it may be made of a transparent material. The throttle pipe 40 forms a throttle channel 401 with a smaller diameter than the flow channel diameter of the downstream portion 10b of the suction side pipe 10 inside. The diameter of the throttle channel 401 is such that when the liquid flows through the throttle channel 401 due to the suction force of the pump 5, bubbles of gas dissolved in the liquid are generated behind the outlet 403 of the throttle channel 401. It is defined. A cross section of the throttle channel 401 perpendicular to the central axis L of the throttle tube 40 is circular.

An inlet portion 402 of the throttle tube 40 (throttle flow path 401) is formed in a shape (tapered shape) whose diameter gradually decreases as it progresses in the downstream direction. More specifically, the inlet portion 402 has an outer peripheral portion 402a that forms a surface perpendicular to the central axis L of the throttle tube 40, and a shape (tapered shape) that gradually decreases in diameter along the inner side of the outer peripheral portion 402a in the downstream direction. ) and a sloped portion 402b formed in the . The outer peripheral portion 402a and the inclined portion 402b are formed in an annular shape when viewed from the direction of FIG.

The throttle channel 401 has a constant diameter portion 404 that forms a channel with a constant diameter along the direction of the central axis L. As shown in FIG. A constant diameter portion 404 is formed between the inlet portion 402 and the outlet portion 403 . A width d12 (see FIG. 6) of the constant diameter portion 404 in the direction of the central axis L is greater than a width d11 (see FIG. 6) of the inlet portion 402 in the direction of the central axis L. Specifically, for example, the width d11 5 times or more.

The outlet portion 403 of the throttle channel 401 has an end face 403a substantially perpendicular to the central axis L, and an opening 403b (outlet) of the throttle channel 401 formed at the center of the end face 403a. The end surface 403a is formed as a surface that is perpendicular to the entire center axis L or a surface that is nearly perpendicular. The angle θ1 (see FIG. 6) of the end surface 403a with respect to the central axis L is larger than the angle θ2 (see FIG. 6) of the inclined portion 402b of the inlet portion 402 with respect to the central axis L, and is closer to 90 degrees than the angle θ2. set.

Further, the throttle tube 40 has a protruding portion 405 that protrudes in parallel to the central axis L rearward (downstream) from the end surface 403a of the outlet portion 403 . The protruding portion 405 is formed in a shape that does not hide the air bubble generation region 450 on the rear side of the outlet portion 403 when viewed from the side in FIGS. It is formed in a conductive shape. Specifically, the protruding portion 405 is provided so as to protrude from a partial section of the end face 403a in the circumferential direction around the opening 403b. In addition, a plurality of (specifically, four) protrusions 405 are formed at intervals along the circumferential direction.

The amount of protrusion d13 (the width of the protrusion 405 in the direction of the central axis L) (see FIG. 6) of each protrusion 405 from the outlet 403 (end surface 403a) is the same. The projection amount d13 is larger than the length of the throttle channel 401 (body portion 41 described later) in the direction of the central axis L (the sum of the width d11 of the inlet portion 402 and the width d12 of the constant diameter portion 404). small. Specifically, the amount of protrusion d13 is smaller than 1/2 the length (=d11+d12) of the throttle channel 401, and more specifically smaller than 1/3, for example.

In this embodiment, the plurality of protruding portions 405 are formed at even or substantially equal intervals in the circumferential direction, but they do not have to be formed at equal intervals. A space (in other words, a notch) communicating with the bubble generation region 450 is formed between the plurality of projecting portions 405 .

A width d21 (see FIG. 9) of each protrusion 405 in the circumferential direction around the opening 403b is a width d22 (hereinafter referred to as a space between the protrusions) in the circumferential direction of the space formed between the protrusions 405 ( 9) is smaller. Here, the width d21 of any of the four protrusions 405 is smaller than the width d22 of any of the spaces between the four protrusions.

A portion of the throttle tube 40 that forms the throttle channel 401 (a portion other than the projecting portion 405) is hereinafter referred to as a main body portion 41. As shown in FIG. The projecting portion 405 is formed in a substantially triangular shape when viewed in the direction of FIG. 9 (plan view perpendicular to the central axis L). That is, the tip surface 405a of the projecting portion 405 is formed in a substantially triangular shape when viewed from the direction of FIG. The projecting portion 405 has an arc-shaped outer peripheral line coinciding with the outer peripheral line of the main body portion 41 when viewed from the direction of FIG. 9 . In other words, the projecting portion 405 has an outer peripheral side surface (curved surface) that is continuous with the outer peripheral side surface (curved surface) of the main body portion 41 . 9, the projecting portion 405 is formed at a position radially away from the opening 403b of the outlet portion 403. As shown in FIG. The body portion 41 and the projecting portion 405 are integrally formed of the same material. The body portion 41 and the projecting portion 405 are formed by cutting a cylindrical material.

The throttle pipe 40 is detachably provided in the suction side pipe 10b. In other words, there is no fixing member (fastening member such as a screw or adhesive member such as tape) for fixing the throttle tube 40 and the suction side tube 10b. Therefore, the throttle tube 40 can be removed from the suction side tube 10b.

Further, the outer peripheral side surface of the throttle pipe 40 (main body portion 41) is in close contact with the inner surface of the suction side pipe 10b. Further, the tip surface 405 a of the projecting portion 405 is in contact with the end surface of the suction port 51 of the pump 5 . That is, the projecting portion 405 is positioned at the suction port 51 .

The ultrasonic cleaning apparatus 1 includes a control section 90 that controls the output of the ultrasonic vibrator 4 and the like, and a support section 95 that supports the control section 90 (see FIG. 1). The control unit 90 includes a power switch 91 that switches the power supply on and off, an output adjustment unit 92 that adjusts the power supplied to the ultrasonic transducer 4 (in other words, the output power of the ultrasonic transducer 4), and an ultrasonic transducer. 4 and a pump switch 94 for switching the pump 5 on and off. The maximum output value that can be adjusted by the output adjuster 92 is, for example, 1000W. The display unit 93 displays the ratio (0 to 100%) of the current output value to a predetermined maximum output value (eg 1000W).

The support portion 95 has a base 95a on which the control portion 90 is placed, and a hook portion 95b for hooking the base 95a to the upper end of the outer casing 3 (in other words, the upper bent portion 23 of the tank 2). The hook portion 95b is provided detachably with respect to the outer case 3. As shown in FIG. Therefore, the support part 95 and the control part 90 supported by this can be installed at any position in the circumferential direction of the upper end of the outer casing 3 . In this manner, the control section 90 is provided in a state of being suspended from the upper end of the outer casing 3 via the support section 95 . The control unit 90 is connected to the ultrasonic transducer 4 and the pump 5 by electric cables.

Next, the effects of the ultrasonic cleaning device 1 will be described. When using the ultrasonic cleaning apparatus 1, first, the lid 7 of the bath 2 is opened and a cleaning liquid (for example, water) is put into the bath 2 as a liquid. At this time, an additive such as a detergent may be mixed with the cleaning liquid. The amount of the liquid to be put into the tank 2 is the amount that flows from the washing space 25 over the partition plate 24 and overflows into the second space 26 . Therefore, after the cleaning liquid is put into the tank 2 , the liquid surface W1 (see FIG. 1) in the cleaning space 25 is at the same height as the upper end 241 of the partition plate 24 . The second space 26 is also filled with water. Next, an object to be washed, such as a car wheel, is placed in the washing space 25 . Also, the filter 30 is placed in the second space 26 to float on the liquid surface W2. Note that the object to be cleaned and the filter 30 may be placed in the tank 2 in advance before the cleaning liquid is added to the tank 2 .

After that, the power switch 91 of the control section 90 is turned on, and the output adjustment section 92 is operated to operate the ultrasonic transducer 4 . Furthermore, the pump switch 94 is turned on to operate the pump 5 . When operating the pump 5, the first valve 13 and the second valve 14 are opened, and the third valve 15 and the fourth valve 16 are closed.

By operating the pump 5 , the cleaning liquid in the second space 26 is sucked into the pump 5 through the liquid circulation hole 28 and the suction side tube 10 . The cleaning liquid sucked by the pump 5 is sent to the cleaning space 25 from the discharge port 52 through the discharge side tube 11 and the liquid circulation holes 27 . By sending the cleaning liquid from below the cleaning space 25 , the cleaning liquid in the cleaning space 25 overflows the partition plate 24 and overflows into the second space 26 . Thereby, the cleaning liquid in the cleaning space 25 is circulated by the pump 5 .

Further, when the circulating cleaning liquid reaches the throttle channel 401 (main body portion 41) of the throttle tube 40, the cross-sectional area of the channel becomes narrower, the flow velocity increases, and the dynamic pressure (kinetic energy per unit volume) of the cleaning liquid increases. The static pressure (pressure) drops abruptly along with the abrupt rise. After that, when the cleaning liquid passes through the throttle channel 401, the cross-sectional area of the channel increases, so that the flow velocity slows down, and the dynamic pressure of the cleaning liquid drops sharply while the static pressure rises sharply. Due to such a rapid pressure change, cavitation occurs in the region 450 on the rear side of the throttle channel 401, and bubbles of gas (air) dissolved in the liquid are generated. The air bubbles are sent to the cleaning space 25 together with the cleaning liquid, rise in the liquid in the cleaning space 25, and are finally released from the liquid surface W1 to the outside. Degassing of the cleaning liquid is thus performed. By performing deaeration, ultrasonic waves can be propagated over a wide range of the cleaning space 25, and a cavitation phenomenon due to ultrasonic waves can be effectively generated over a wide range. As a result, the object to be cleaned can be effectively cleaned. In particular, in the present embodiment, the tank 2 is configured to be large, and the distance from the ultrasonic vibrator 4 is large in the vicinity of the liquid surface W1, so ultrasonic waves are less likely to propagate than in the vicinity of the bottom surface 22a. However, by degassing, the cavitation phenomenon can be effectively generated even in the vicinity of the liquid surface W1.

It should be noted that whether or not the degassing has been sufficiently performed can be determined by the sound volume of the ultrasonic waves generated in the tank 2 . Specifically, when the degassing is insufficient, the cavitation phenomenon due to ultrasonic waves is also insufficient, and the sound generated in the tank 2 is small. When the degassing is sufficiently performed, cavitation is effectively generated, and the sound generated in the tank 2 is increased.

In addition, the throttle pipe 40 is formed in a shape that communicates with the air bubble generation region 450 from the side, and the suction side pipe 10b is formed of a translucent material. 450 can be seen. As a result, it is possible to easily and accurately determine the state of bubble generation in the throttle tube 40 .

Here, the generation of air bubbles in the throttle pipe 40 depends on the cross-sectional area of the throttle channel 401, the performance of the pump 5 (specifically, the head of the pump 5, etc.), and the difference in the commercial power frequency supplied to the pump 5 (50 Hz , 60 Hz difference). For example, the higher the head of the pump 5 is, the more easily bubbles are generated. Further, in general pumps, a commercial power supply frequency of 60 Hz has a higher head than a commercial power supply frequency of 50 Hz. Therefore, air bubbles are more likely to occur when the commercial power frequency is 60 Hz than when the frequency is 50 Hz. If air bubbles are not effectively generated in the throttle pipe 40, for example, the throttle pipe 40 may be replaced with another throttle pipe 40 having a different cross-sectional area of the throttle flow path 401, or another pump with a higher lift may be used. It is possible to take countermeasures such as exchanging to 5. In this case, the throttle pipe 40 is inserted into the suction side pipe 10b and is not fixed by a fastening member, welding, or adhesive member (tape, etc.), so the throttle pipe 40 can be easily removed. It can be removed from the suction side pipe 10b. In addition, another throttle pipe 40 can be easily attached to the suction side pipe 10b.

In addition, since a plurality of (specifically, four) spaces (spaces between protrusions) communicating with the air bubble generation region 450 from the side are formed in the rear side of the throttle channel 401, the throttle pipe 40 is the center. The bubble generation area 450 is visible in any orientation around the axis L. FIG. Furthermore, since the circumferential width d22 (see FIG. 9) of the inter-projection space is larger than the circumferential width d21 (see FIG. 9) of the projecting portion 405, the bubble generation region 450 is easily visible.

In addition, since the protruding portion 405 is positioned at the suction port 51 of the pump 5, the throttle pipe 40 can be accurately arranged at a closer position in front of the pump 5. Since a plurality of projecting portions 405 are provided as positioning portions, it is possible to prevent the position of the throttle pipe 40 from shifting while the liquid is flowing through the throttle pipe 40 . Furthermore, since the width d13 of the projecting portion 405 in the direction of the central axis L is smaller than the width (d11+d12) of the body portion 41 in the direction of the central axis L, the throttle pipe 40 can be arranged closer to the front of the pump 5. can. As a result, the cleaning liquid can be efficiently made to flow through the throttle pipe 40 , and air bubbles can be effectively generated in the throttle pipe 40 . Further, by providing the throttle pipe 40 at a position closer to the pump 5 , it is possible to prevent bubbles generated in the throttle pipe 40 from disappearing before being sent to the cleaning space 25 .

Further, since the inlet portion 402 of the throttle tube 40 is tapered, the cleaning liquid can be smoothly guided to the constant diameter portion 404 of the throttle channel 401, and the pressure loss of the cleaning liquid at the inlet portion 402 can be suppressed.

In addition, the outlet portion 403 of the throttle channel 401 is formed on a plane with an angle closer to a plane perpendicular to the central axis L than the inlet portion 402. Since it is formed in a diametrical shape, it is possible to increase the pressure change of the liquid between the inside and outside of the throttle channel 401 and to effectively generate bubbles by cavitation in the bubble generation region 450 .

Further, since a high-lift pump 5 (for example, a maximum lift of 10 m or more) is provided downstream of the throttle tube 40 , the cleaning liquid can be efficiently circulated through the flow path 401 of the throttle tube 40 .

In addition, since the cleaning liquid circulates so that it flows out from the upper part of the cleaning space 25 into the second space 26 and flows in from the lower part of the cleaning space 25, it is possible to generate a flow of the cleaning liquid in the cleaning space 25, and there is no flow. The detergency can be strengthened compared to the case. Further, the liquid outflow part from the washing space 25 is set at the upper end 241 of the partition plate 24, and the liquid inlet 27 to the washing space 25 is positioned closer to the bottom surface 22a of the washing space 25 than to the bottom surface 22b of the second space 26. Moreover, since it is set at a position lower than the pump 5, the cleaning liquid can flow over a wide range in the vertical direction of the cleaning space 25. As shown in FIG. As a result, the detergency can be enhanced over a wide range in the vertical direction.

In addition, since the groove 245 is formed in the upper end 241 of the partition plate 24, the cross-sectional area of the flow path is narrowed at the position of the groove 245, so that the flow velocity of the cleaning liquid from the cleaning space 25 to the second space 26 can be increased. . This allows the cleaning liquid to flow efficiently from the cleaning space 25 to the second space 2 . Further, a flow toward the upper end 241 can be generated even at a position away from the upper end 241 of the partition plate 24 in the plane of the liquid surface W1 of the cleaning space 25 . As a result, it is possible to prevent dirt removed from the object to be cleaned from remaining on the liquid surface W1. As a result, when the object to be washed is lifted out of the washing space 25 after washing, it is possible to prevent reattachment of dirt to the object to be washed.

Furthermore, since the groove 245 includes the end groove 245a formed at the end portion in the width direction of the upper end 241, it is possible to prevent dirt from remaining on the end portion.

In addition, the bottom plate 22b of the second space 26 is provided in an inclined state, and the liquid circulation hole 28 formed in the bottom surface 22b is formed at a position closer to the lower end 22b2 in the direction of inclination of the bottom plate 22b. (see FIG. 2), the liquid in the second space 26 can be guided toward the liquid circulation hole 28 and easily flowed out from the liquid circulation hole 28 . Furthermore, since the liquid circulation hole 28 is provided above the pump 5 , the cleaning liquid can be efficiently sucked from the second space 26 into the pump 5 . As described above, the efficiency of circulation of the cleaning liquid by the pump 5 can be improved.

Moreover, since the filter 30 is provided in the second space 26 , the cleaning liquid can be cleaned and then returned to the cleaning space 25 . As a result, it is possible to prevent dirt from reattaching to the object to be cleaned. Furthermore, since the filter 30 is provided in a floating state on the liquid surface W2 of the second space 26, installation of the filter 30 in the second space 26, cleaning of the filter 30, or replacement of the filter 30 is easy. In addition, since the pump 5 sucks the cleaning liquid from which dirt has been removed by the filter 30, it is possible to prevent dirt from accumulating inside the pump 5 and the pipes 10, 11, and 12. FIG.

Further, pipes 11b and 11c open to the outside are connected to the liquid flow holes 27 of the washing space 25, so that after washing, the liquid in the washing space 25 is discharged to the outside through the liquid flow holes 27 and the pipes 11b and 11c. can. To discharge the liquid in the washing space 25, the second valve 14 shown in FIG. 1 should be closed and the third valve 15 should be opened. Further, since the liquid circulation hole 27 is formed in the lower part of the cleaning space 25, it is possible to prevent the liquid from remaining in the cleaning space 25 when the liquid is discharged.

In addition, since the third tube 12 having one end opened to the outside is connected to the liquid circulation hole 28 of the second space 26, the liquid in the second space 26 can be transferred to the liquid circulation hole 28 and the third pipe after cleaning. It can be discharged to the outside through the tube 12 of. To discharge the liquid in the second space 26, the first valve 13 shown in FIG. 1 is closed and the fourth valve 16 is opened. Since the liquid flow hole 28 is formed below the inclined bottom surface 22b of the second space 2, it is possible to prevent the liquid from remaining in the second space 26 when the liquid is discharged.

Further, since the tank 2 and the outer case 3 supporting it are not in contact except at the upper part, it is possible to suppress the transmission of the ultrasonic vibrations from the ultrasonic vibrator 4 from the tank 2 to the outer box 3. That is, resonance of the outer casing 3 due to ultrasonic waves can be suppressed. As a result, attenuation of ultrasonic waves can be suppressed. Further, since the tank 2 and the outer case 3 are connected via the silicon 8, the transmission of ultrasonic vibrations from the tank 2 to the outer box 3 can be further suppressed.

It should be noted that the present disclosure is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, an example was described in which the portion of the suction side pipe where the throttle pipe was provided was made of a translucent material. After that, the throttle pipe may be incorporated in an ultrasonic cleaning apparatus having a suction side pipe made of a material that does not transmit light (in other words, a light-shielding material, an opaque material). Further, in the above-described embodiment, an example in which the number of projecting portions of the restrictor tube is four is shown, but the number may be any number, or may be one.

REFERENCE SIGNS LIST 1 ultrasonic cleaning device 2 tank 3 outer case 4 ultrasonic transducer 5 pump 51 suction port of pump 10 suction side pipe (connecting pipe)
40 throttle pipe 403 outlet of throttle channel 405 protrusion of throttle pipe 450 bubble generation region

In this regard, in the conventional ultrasonic cleaning apparatus to which the degassing method such as that disclosed in Patent Document 1 is applied, the suction side pipe is narrowed by providing a throttle portion in the middle of the suction side pipe , which is the suction side pipe of the pump. , and there are connection points with the suction side pipe on both the inlet side and the outlet side of the throttle section. Since the throttle portion and the suction side pipe are connected at the connection point by welding, bolts, or the like, the throttle portion cannot be attached or removed easily.

The present disclosure has been made in view of the above problem, and an object thereof is to provide an ultrasonic cleaning apparatus and a throttle pipe as the throttle section, which can easily attach or detach the throttle section.

The ultrasonic cleaning device of the present disclosure is
a tank containing a liquid and an object to be cleaned;
an ultrasonic transducer provided inside the tank;
a pump provided outside the tank for circulating the liquid in the tank;
a connecting pipe that connects the tank and the pump;
a throttle pipe that is provided in front of the suction port of the pump and generates bubbles of gas dissolved in the liquid on the rear side by narrowing the cross-sectional area of the flow path of the liquid,
Using the connection pipe connecting the suction port and the tank as a suction side pipe ,
The throttle pipe is provided in a state in which the entire throttle pipe is inserted into the suction side pipe , and has a protruding portion that protrudes rearward from an outlet portion of a throttle flow path formed in the throttle pipe . ,
The protruding portion is positioned at the suction port and is formed in a shape that communicates from the side with the air bubble generation region on the rear side of the outlet portion.

According to this, the throttle pipe as the throttle portion is provided in a state in which the whole is inserted into the suction side pipe , and the throttle pipe can be mounted without using fastening members such as welding and bolts. Therefore, it is possible to easily attach or detach the throttle tube . In addition, the throttle pipe has a projection projecting rearward from the outlet of the flow path of the throttle pipe , and the projection is positioned at the suction port of the pump. can be accurately positioned closer to the pump. In this way, by providing the throttle pipe at a position where the suction force of the pump is stronger, it is possible to effectively generate air bubbles by cavitation on the rear side of the throttle pipe . Furthermore, since the projecting portion is formed in a shape that communicates with the air bubble generation region from the side, when the suction side pipe is formed of a translucent material, the air bubble generation region can be visually observed through the suction side pipe . . As a result, it is possible to accurately determine the state of bubble generation in the throttle tube , and if bubbles are not effectively generated, it is possible to take countermeasures such as replacing the tube with another throttle tube .

In addition, the throttle tube of the present disclosure is
A throttle tube forming a throttle channel for generating bubbles of gas dissolved in the liquid on the rear side,
having a protruding portion protruding rearward from the outlet portion of the throttle channel,
The projecting portion is formed in a shape that communicates from the side with the air bubble generation region on the rear side of the outlet portion,
The entire throttle tube is inserted into the suction side tube of the pump that circulates the liquid of the ultrasonic cleaning device, and the protruding portion is used so as to be positioned at the suction port of the pump.

By incorporating the throttle pipe of the present disclosure into the ultrasonic cleaning apparatus, the same effects as those of the ultrasonic cleaning apparatus of the present disclosure can be obtained.

The ultrasonic cleaning apparatus 1 also includes pipes 10, 11 and 12 connecting the pump 5 and the tank 2, and valves 13 to 16 provided in the middle of the pipes 10 , 11 and 12 (Fig. 1, See Figure 2). 2, the illustration of the valves 13 to 16 is omitted. The first pipe 10 is a suction side pipe that connects between the liquid circulation hole 28 of the second space 26 and the suction port 51 of the pump 5 . As shown in FIG. 2, the suction pipe 10 has an upstream portion 10a and a downstream portion 10b. The upstream portion 10a is configured as a metal rigid tube . One end of the upstream portion 10a is connected to the liquid flow hole 28 of the second space 26, and the other end is connected to one end of the downstream portion 10b. The downstream portion 10b is configured as a soft tube made of a soft material such as resin. Further, the downstream portion 10b is made of a translucent material. The degree of translucency of the downstream portion 10b may be such that bubbles (microbubbles) generated on the rear side of the later-described throttle tube 40 can be visually observed from the outside of the downstream portion 10b. The visible light transmittance of 10b is 10% or more. One end of the downstream portion 10 b is connected to the upstream portion 10 a and the other end is connected to the suction port 51 of the pump 5 . In addition, below, the downstream part 10b may be called a suction side pipe |tube.

The second pipe 11 is a discharge side pipe that connects between the discharge port 52 of the pump 5 and the liquid circulation hole 27 of the washing space 25 . The discharge-side pipe 11 has a branch portion 11 d that branches in two directions in the middle, and the end portion of the portion 11 b that forms one flow path after branching is connected to the liquid flow hole 27 of the cleaning space 25 . there is The end of the portion 11c forming the other channel after branching is open to the outside.

The third pipe 12 is provided so as to branch off from the upstream portion 10a of the suction side pipe 10 . One end of the pipe 12 is connected to the upstream portion 10a and the other end is open to the outside.

The first valve 13 is provided on the suction side pipe 10 , and more specifically, is provided on the upstream side portion 10 a of the suction side pipe 10 downstream of the connecting portion with the third pipe 12 . The first valve 13 is configured as a valve for manually switching opening and closing of the flow path of the upstream portion 10a.

The second valve 14 is provided on the discharge side pipe 11 , specifically, on the upstream side of the branch portion 11 d of the discharge side pipe 11 . The second valve 14 is configured as a valve for manually switching opening and closing of the flow path on the upstream side of the branch portion 11 d of the discharge side pipe 11 .

The third valve 15 is provided on the discharge side pipe 11, and more specifically, is provided on a post-branch portion 11c of the discharge side pipe 11 whose end is open to the outside. The third valve 15 is configured as a valve for manually switching opening and closing of the flow path of the post-branch portion 11c.

A fourth valve 16 is provided in the third tube 12 . The fourth valve 16 is configured as a valve for manually switching opening and closing of the flow path of the third pipe 12 .

The ultrasonic cleaning device 1 has a throttle pipe 40 (see FIGS. 6 to 9). The throttle pipe 40 is a member for generating bubbles of gas (oxygen, nitrogen, carbon dioxide, etc.) dissolved in the liquid in the tank 2 to deaerate the liquid. The throttle pipe 40 is provided in a state in which the entire throttle pipe 40 is inserted into the downstream portion 10b of the suction side pipe 10 (see FIG. 6). The throttle pipe 40 is formed in a cylindrical shape, for example, from a hard resin such as vinyl chloride. Further, although the throttle tube 40 is made of, for example, an impermeable material (opaque material), it may be made of a transparent material. The throttle pipe 40 forms inside thereof a throttle channel 401 having a diameter smaller than that of the downstream portion 10 b of the suction side pipe 10 . The diameter of the throttle channel 401 is such that when the liquid flows through the throttle channel 401 due to the suction force of the pump 5, bubbles of gas dissolved in the liquid are generated behind the outlet 403 of the throttle channel 401. It is defined. A cross section of the throttle channel 401 perpendicular to the central axis L of the throttle pipe 40 is circular.

An inlet portion 402 of the throttle pipe 40 (throttle flow path 401) is formed in a shape (tapered shape) whose diameter gradually decreases in the downstream direction. More specifically, the inlet portion 402 has an outer peripheral portion 402a that forms a surface perpendicular to the central axis L of the throttle pipe 40, and a shape (tapered shape) that gradually decreases in diameter along the inner side of the outer peripheral portion 402a in the downstream direction. ) and a sloped portion 402b formed in the . The outer peripheral portion 402a and the inclined portion 402b are formed in an annular shape when viewed from the direction of FIG.

Further, the throttle pipe 40 has a protruding portion 405 that protrudes in parallel to the central axis L rearward (downstream) from the end surface 403 a of the outlet portion 403 . The protruding portion 405 is formed in a shape that does not hide the air bubble generation region 450 on the rear side of the outlet portion 403 when viewed from the side in FIGS. It is formed in a conductive shape. Specifically, the protruding portion 405 is provided so as to protrude from a partial section of the end face 403a in the circumferential direction around the opening 403b. In addition, a plurality of (specifically, four) protrusions 405 are formed at intervals along the circumferential direction.

A portion of the throttle pipe 40 that forms the throttle channel 401 (a portion other than the projecting portion 405 ) is hereinafter referred to as a main body portion 41 . The projecting portion 405 is formed in a substantially triangular shape when viewed in the direction of FIG. 9 (plan view perpendicular to the central axis L). That is, the tip surface 405a of the projecting portion 405 is formed in a substantially triangular shape when viewed from the direction of FIG. The projecting portion 405 has an arc-shaped outer peripheral line coinciding with the outer peripheral line of the main body portion 41 when viewed from the direction of FIG. 9 . In other words, the projecting portion 405 has an outer peripheral side surface (curved surface) that is continuous with the outer peripheral side surface (curved surface) of the main body portion 41 . 9, the projecting portion 405 is formed at a position radially away from the opening 403b of the outlet portion 403. As shown in FIG. The body portion 41 and the projecting portion 405 are integrally formed from the same material. The body portion 41 and the projecting portion 405 are formed by cutting a cylindrical material.

The throttle pipe 40 is detachably provided in the suction side pipe 10b. In other words, there is no fixing member (a fastening member such as a screw or an adhesive member such as a tape) for fixing the throttle pipe 40 and the suction side pipe 10b. Therefore, the throttle pipe 40 can be removed from the suction side pipe 10b.

Further, the outer peripheral side surface of the throttle pipe 40 (body portion 41) is in close contact with the inner surface of the suction side pipe 10b. Further, the tip surface 405 a of the projecting portion 405 is in contact with the end surface of the suction port 51 of the pump 5 . That is, the projecting portion 405 is positioned at the suction port 51 .

By operating the pump 5 , the cleaning liquid in the second space 26 is sucked into the pump 5 through the liquid circulation hole 28 and the suction side pipe 10 . The cleaning liquid sucked by the pump 5 is sent to the cleaning space 25 from the discharge port 52 through the discharge side pipe 11 and the liquid circulation holes 27 . By sending the cleaning liquid from below the cleaning space 25 , the cleaning liquid in the cleaning space 25 overflows the partition plate 24 and overflows into the second space 26 . Thereby, the cleaning liquid in the cleaning space 25 is circulated by the pump 5 .

Further, when the circulating cleaning liquid reaches the throttle channel 401 (main body portion 41) of the throttle tube 40, the cross-sectional area of the channel becomes narrower, the flow velocity increases, and the dynamic pressure (kinetic energy per unit volume) of the cleaning liquid increases. The static pressure (pressure) drops abruptly along with the abrupt rise. After that, when the cleaning liquid passes through the throttle channel 401, the cross-sectional area of the channel increases, so that the flow velocity slows down, and the dynamic pressure of the cleaning liquid drops sharply while the static pressure rises sharply. Due to such a rapid pressure change, cavitation occurs in the region 450 on the rear side of the throttle channel 401, and bubbles of gas (air) dissolved in the liquid are generated. The air bubbles are sent to the cleaning space 25 together with the cleaning liquid, rise in the liquid in the cleaning space 25, and are finally released from the liquid surface W1 to the outside. Degassing of the cleaning liquid is thus performed. By performing deaeration, ultrasonic waves can be propagated over a wide range of the cleaning space 25, and a cavitation phenomenon due to ultrasonic waves can be effectively generated over a wide range. As a result, the object to be cleaned can be effectively cleaned. In particular, in the present embodiment, the tank 2 is configured to be large, and the distance from the ultrasonic vibrator 4 is large in the vicinity of the liquid surface W1, so ultrasonic waves are less likely to propagate than in the vicinity of the bottom surface 22a. However, by degassing, the cavitation phenomenon can be effectively generated even in the vicinity of the liquid surface W1.

In addition, the throttle pipe 40 is formed in a shape that communicates with the air bubble generation region 450 from the side, and the suction side pipe 10b is formed of a translucent material. 450 can be seen. As a result, it is possible to easily and accurately determine the state of bubble generation in the throttle tube 40 .

Further, since the inlet portion 402 of the throttle pipe 40 is tapered, the cleaning liquid can be smoothly guided to the constant diameter portion 404 of the throttle channel 401, and the pressure loss of the cleaning liquid at the inlet portion 402 can be suppressed.

Further, since a high-lift pump 5 (for example, a maximum lift of 10 m or more) is provided downstream of the throttle pipe 40 , the cleaning liquid can be efficiently circulated through the flow path 401 of the throttle pipe 40 .

In addition, since the pipes 11b and 11c open to the outside are connected to the liquid flow holes 27 of the washing space 25, after washing, the liquid in the washing space 25 is discharged to the outside through the liquid flow holes 27 and the pipes 11b and 11c. can. To discharge the liquid in the washing space 25, the second valve 14 shown in FIG. 1 should be closed and the third valve 15 should be opened. Further, since the liquid circulation hole 27 is formed in the lower part of the cleaning space 25, it is possible to prevent the liquid from remaining in the cleaning space 25 when the liquid is discharged.

In addition, since the third pipe 12 having one end opened to the outside is connected to the liquid circulation hole 28 of the second space 26, the liquid in the second space 26 can flow through the liquid circulation hole 28 and the third pipe after cleaning. can be discharged to the outside through a pipe 12 of . To discharge the liquid in the second space 26, the first valve 13 shown in FIG. 1 is closed and the fourth valve 16 is opened. Since the liquid flow hole 28 is formed below the inclined bottom surface 22b of the second space 2, it is possible to prevent the liquid from remaining in the second space 26 when the liquid is discharged.

Claims (13)

a tank containing a liquid and an object to be cleaned;
an ultrasonic transducer provided inside the tank;
a pump provided outside the tank for circulating the liquid in the tank;
a connecting tube connecting the tank and the pump;
a throttle pipe that is provided in front of the suction port of the pump and generates bubbles of gas dissolved in the liquid on the rear side by narrowing the cross-sectional area of the flow path of the liquid,
Using the connection pipe connecting the suction port and the tank as a suction side pipe,
The throttle tube is provided in a state in which the entire throttle tube is inserted into the suction side tube, and has a protruding portion that protrudes rearward from an outlet of a throttle channel formed in the throttle tube. ,
The protruding portion is positioned at the suction port and is formed in a shape that communicates from the side with a bubble generation area on the rear side of the outlet portion,
Ultrasonic cleaning equipment. 2. The ultrasonic cleaning apparatus according to claim 1, wherein a portion of said suction-side tube into which said throttle tube is inserted is made of a translucent material. 3. The ultrasonic cleaning apparatus according to claim 1, wherein the protruding portion is provided so as to protrude rearward from a partial section in the circumferential direction around the opening of the throttle channel at the outlet portion. 4. The ultrasonic cleaning apparatus according to claim 3, wherein a plurality of said protrusions are formed at intervals along said circumferential direction. The inlet portion of the throttle pipe is formed in a shape that gradually decreases in diameter as it progresses in the downstream direction,
Claims 1 to 4, wherein the outlet portion is formed so as to form an opening of the throttle channel on a plane perpendicular to the central axis of the throttle pipe or on a plane having an angle closer to the perpendicular plane than the inlet portion. The ultrasonic cleaning device according to any one of . The tank has a partition that divides the interior into a first space and a second space,
the first space is a cleaning space in which the object to be cleaned is placed;
The second space is a space for storing the liquid overflowing from the first space beyond the partition,
A filter provided in the second space for removing dirt in the liquid,
The suction-side pipe is connected to the second space at a position below the filter,
6. The ultrasonic cleaning apparatus according to any one of claims 1 to 5, wherein a discharge-side pipe, which is the connection pipe connected to the discharge port of the pump, is connected to the first space. the suction-side pipe is connected to the second space at a position above the suction port,
7. The ultrasonic cleaning apparatus according to claim 6, wherein said discharge side pipe is connected to said first space at a position below said discharge port. The bottom surface of the second space is located above the bottom surface of the first space,
8. The ultrasonic cleaning apparatus according to claim 7, wherein said suction side pipe is connected to said bottom surface of said second space. The bottom surface of the second space is provided in a state inclined with respect to the horizontal direction,
A hole connected to the suction-side pipe, which is formed in the bottom surface of the second space, is formed at a position closer to the lower end than the upper end of both ends of the bottom surface in the inclination direction. The ultrasonic cleaning device according to claim 8. Grooves for circulating the liquid from the first space to the second space are repeatedly formed in the upper end of the partition part along the width direction of the upper end intersecting the direction of flow,
10. The ultrasonic cleaning apparatus according to any one of claims 6 to 9, wherein the groove has an end groove located at an end of the upper end in the width direction. An outer box provided so as to surround the periphery of the tank,
The upper part of the tank is supported by the outer box,
The ultrasonic cleaning apparatus according to any one of claims 1 to 10, wherein the bath does not contact the inner surface of the outer case except for the upper portion supported by the outer case. 12. The ultrasonic cleaning apparatus according to claim 11, wherein said bath is supported by said outer case via silicon. A throttle tube forming a throttle channel for generating bubbles of gas dissolved in the liquid on the rear side,
having a protruding portion protruding rearward from the outlet portion of the throttle channel,
The projecting portion is formed in a shape that communicates from the side with the air bubble generation region on the rear side of the outlet portion,
A throttle tube used so that the whole of the throttle tube is inserted into a tube on the suction side of a pump that circulates the liquid of the ultrasonic cleaning device, and the protruding portion is positioned at the suction port of the pump.

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