JP7441569B2 - liquid circulation device - Google Patents

Description

The present invention relates to a liquid circulation device used, for example, with a wet power tool.

Patent Documents 1 to 3 disclose devices that supply cooling water to the cutting edge of a power tool used for drilling or cutting concrete, etc., and also collect and filter the suspension generated on the power tool side, and resupply the power tool to the power tool. Disclosed. The device (liquid supply device) disclosed in Patent Document 1 is a device for discharging water into which cuttings, drilling waste, dust, and sludge (hereinafter referred to as "shavings, etc.") have settled due to their own weight from a suspension stored in a liquid container. The filtrate from which large debris has been removed is sucked up through a strainer from the top. The device (portable circulating filtration device) disclosed in Patent Document 2 filters the cuttings and the like contained in the suspension multiple times using a plurality of successively adjacent filters. The device disclosed in Patent Document 3 (slag water collection and filtration device) uses a filter to suck up the supernatant liquid of slag water in a collection container and filter it.

JP2022-031082A Patent No. 3623927 Japanese Patent Application Publication No. 2007-077691

In the devices disclosed in Patent Documents 1 and 3, the filtered water is obtained by filtering the supernatant in which cuttings and the like have settled from the suspension using a filter. In other words, the amount of filtrate water secured per unit time depends on the manner in which the cuttings and the like sink. Therefore, it is necessary to collect the suspension liquid quietly, which limits the work place and work mode. Furthermore, depending on the type of cuttings contained in the suspension, the drainage hose for collection may become clogged, causing the suspension to overflow. Furthermore, if the particle size of the cuttings contained in the suspension is small and dense enough to pass through the filter, not only will it take time to secure the filtrate, but the filter will frequently become clogged. The number of times work will have to be stopped for replacement or cleaning increases.
The device disclosed in Patent Document 2 requires 2 to 4 filters. Therefore, like the devices disclosed in Patent Documents 1 and 3, the number of times the work is stopped for filter replacement increases, making it impossible to improve work efficiency.

One of the objects of the present invention is to provide a liquid circulation device that can improve the work efficiency of construction using wet power tools. Other objects of the present invention will become apparent from the disclosure herein.

One aspect of the present invention that solves the above main problem is a liquid circulation device that collects a suspension from a wet power tool, extracts a filtrate from the collected suspension, and supplies it to the wet power tool, a flexible filter; a first pump that sucks the suspension in a first direction of the filter; and a first pump that sucks the filtrate into the wet power tool after the first pump starts suctioning; a second pump that starts supply and stops the supply before the first pump stops suction; the filter body partially bends when the first pump starts suction; When the first pump stops suctioning, the deflection is released and the filtrate that has passed through it heads in a second direction opposite to the first direction , and the first pump The second pump is a vacuum pump that sucks the suspension together with air using a stronger negative pressure than the second pump, and the second pump is a tube that moves the filtrate within the elastic tube by pressing the elastic tube with a rotating roller. The liquid circulation device is a pump, and the elastic tube is covered with a translucent cover .

According to the liquid circulation device of the above aspect, the work efficiency of construction using a wet power tool can be improved.

FIG. 1 is an external perspective view of a liquid circulation device according to a first embodiment. FIG. 1 is an exploded view of the liquid circulation device according to the first embodiment. It is a figure which shows the structural example of a vacuum pump, (a) is an external view as seen diagonally from above, and (b) is an external view as seen diagonally from below. 2 is a diagram illustrating a structural example of a tube pump, in which (a) is an external view as viewed diagonally from above, (b) is an external view as seen from the right side before operation, and (c) is an external view as seen from the right side during the same operation. It is. (a) is an external view of a relief valve, and (b) is a diagram showing an example of its cross-sectional structure. FIG. 2 is an external perspective view showing an example of a structure for routing tubes of a filtrate relief mechanism. It is a figure which shows the structural example of a storage tank, (a) is a top view, (b) is a downward perspective view. It is a structural explanatory drawing of an exhaust layer unit, (a) is a downward perspective view, (b) is a bottom view, and (c) is a side sectional view showing a state when it is fixed to a storage tank. FIG. 3B is an external view of the exhaust layer unit as viewed diagonally from above for explaining the filter holder, and (b) is an external view when viewed diagonally from below. FIG. 3 is a side sectional view of the liquid circulation device during a suction operation. FIG. 3 is a side sectional view of the liquid circulation device when the suction operation is stopped. FIG. 3 is an external perspective view of a liquid circulation device according to a second embodiment. It is a figure which shows the external appearance example of the liquid circulation device based on 4th Embodiment, (a) is a front external perspective view, (b) is a rear external external perspective view. It is a figure which shows the external appearance example of the liquid circulation device based on 4th Embodiment, (a) is a left view, (b) is a right view. It is a figure which shows the external appearance example of the liquid circulation device based on 4th Embodiment, (a) is a back view, (b) is a front view, (c) is a top view, and (d) is a bottom view. 2A and 2B are diagrams showing a structural example of a storage tank, in which (a) is an external perspective view, (b) is a plan view, and (c) is a sectional view taken along line AA in (b). It is a structural explanatory drawing of the lid part attached to the upper bottom part of a storage tank, (a) is a downward perspective view, (b) is a right view, (c) is a front view, and (d) is a back view. It is a figure which shows the structural example of the storage tank based on 5th Embodiment, (a) is a front external perspective view, and (b) is a top view. 18(a) is a sectional view taken along line AA in FIG. 18(b), and FIG. 18(b) is a sectional view taken along line BB in FIG. 18(b).

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a portable liquid circulation device used with a battery-powered wet power tool will be described below.
As the wet power tool, for example, a wet power drill described in Japanese Patent No. 6661184 or Japanese Patent No. 6711499 disclosed by the applicant of the present application can be used. In this wet type electric drill, a drill bit is attached to the spindle of the electric drill via a wet type shank. The liquid retention area between the drill bit and the drilling site is maintained watertight by a conical elastic member. Cooling water is supplied to the wet type shank from a water supply hose connected to the liquid circulation device. The cooling water cools the drill bit heated by frictional heat, and also stirs up cuttings and the like generated by drilling or drilling with the drill bit to form a suspension containing them. The suspension has a different density and viscosity depending on the material of the perforation site. This suspension is drained to a drain hose connected to the liquid circulation device 1 via the drain mechanism of the wet electric drill.

The wet type electric drill starts water supply after a predetermined delay from the start of suction for drainage, and outputs a control signal to stop water supply before stopping suction by detecting the position of the drill bit. Note that a wet power tool can be any tool or tool system other than a wet drill, as long as it is equipped with a water supply hose for supplying cooling water and a drainage hose for collecting suspension. It is possible to implement the present invention even if there is such a case.

The liquid circulation device is a device that collects a suspension from the above-mentioned wet power drill, extracts a filtrate from the collected suspension, and supplies it to the wet shank of the wet power drill.
In this specification and the drawings, for convenience, the X direction, Y direction, and Z direction are defined as front, rear, left, right, top, and bottom directions. The Z direction is a direction perpendicular to the placement site of the liquid circulation device. The X direction and the Y direction are one of the horizontal directions perpendicular to the Z direction. In this specification, the X direction is the front-back direction (+ on the front, - on the back), the Y direction is the left-right direction (+ on the left (front), - on the right (back)), and the Z direction is the vertical direction (+ on the top, The bottom is -). Furthermore, in the drawings, the directions indicated by the arrows of the X, Y, and Z axes may be referred to as the front direction, the left direction, and the upward direction, respectively. Also, viewing the liquid circulation device from above is a top view, viewing the liquid circulation device from diagonally above is a top view, and viewing the liquid circulation device from the left (or right) side is a left (right) side view. Looking at the liquid circulation device from the lower left or right side of the eye is sometimes called strabismus.

<First embodiment>
FIG. 1 is an external perspective view of a liquid circulation device 1 according to a first embodiment. FIG. 2 is an exploded view of the liquid circulation device 1. As shown in FIG. 3 to 9 are explanatory diagrams of each device component constituting the liquid circulation device 1. FIG. For convenience, illustrations of the water supply hose and drainage hose connected to the above-mentioned wet electric drill are omitted. The liquid circulation device 1 includes internal electrical components including a first pump and a second pump, as well as a filtrate relief mechanism 130, a battery 140, a storage tank 300, an exhaust layer unit 400, and a filtration unit 500.

<Electrical components inside the device>
The liquid circulation device 1 includes internal electrical components including a vacuum pump 110 as an example of a first pump, a tube pump 120 as an example of a second pump, a battery 140, and a control device 150. Each internal electrical component is fixed to a three-dimensional exhaust layer unit 400, which will be described later, and the portion exposed upward from the exhaust layer unit 400 is covered with a housing 200. The housing 200 is fixed to the top plate 421 of the exhaust layer unit 400 with screws. A handle 210 is provided at the top of the housing 200 to be held by an operator. Ground hooks 223 for fixing both ends of the belt are provided above a pair of opposing side surfaces of the housing 200.

As shown in FIGS. 3(a) and 3(b), the vacuum pump 110 has an intake port 1101, a compressor 1102, and an exhaust port 1103. Aspirate liquid. At this time, exhaust gas is released from the exhaust port 1103. The intake port 1101 is fixed to the exhaust layer unit 400 and sucks in the air in the storage tank 300 and sucks the filtrate and suspension through the storage tank 300 and the filtration unit 500. Exhaust from the exhaust port 1103 is radiated to the outside through the exhaust hole 4211 of the exhaust layer unit 400.

As the vacuum pump 110, for example, a product having a flow rate of 500 L/min or more and a driving voltage of DC12V to 36V can be used. Although it is a small and portable liquid circulation device 1, it has much higher suction power than general-purpose pumps such as tube pumps, so it can easily suck even suspensions with high density and viscosity such as cuttings. Extraction of the filtrate by the filtration unit 500 also becomes easier.

As shown in FIGS. 4(a), (b), and (c), the tube pump 120 includes a roller motor 121 having a spindle, a roller motor 121 that rotatably holds the spindle, and an edge formed at the outer end of the upper half. and a motor bracket 122. Tube pump 120 also includes a roller head 123 and an elastic tube 124. In the roller head 123, a plurality of rollers are arranged radially from the center at regular intervals and are rotationally driven by a spindle. Therefore, the roller head 123 operates as a rotating roller. The surface of the elastic tube 124 is in contact with each roller of the roller head 123, and one end is connected to the water supply end 125 and the other end is connected to the water supply end 126, respectively. A water supply tube 127 is connected to the water supply end 125, and a water supply tube 128 is connected to the water supply end 126.

The tube pump 120 creates a vacuum state in the elastic tube 124 when each roller of the roller head 123 presses the elastic tube 124, and pumps water from the water supply tube 127 and the water supply end 125 at the pressure when the vacuum state is released. Aspirate the filtrate. Then, the sucked filtrate is sent out to the water supply end 126 at the rotational speed of the spindle. The filtrate is sent from the water supply tube 128 toward the wet power drill.

Since the tube pump 120 only sends filtered water from which cuttings and the like have been removed, a product with a flow rate of 0.5 L/min or less and a driving power source of DC 12 to 24 V can be used, for example.

The roller head 123 and the elastic tube 124 are covered with a translucent (for example, transparent) pump cover 129 (not shown in FIG. 4). Since the pump cover 129 is transparent, it can be used to check whether the tube pump 120 is operating normally, especially whether the elastic tube 124 has deteriorated, or whether the water supply tube 127 or water supply tube 128 is clogged. can be visually confirmed during operation of the liquid circulation device 1.

The battery 140 supplies DC power to electrical components within the device through the battery bracket 141. Since the wet electric drill is battery-powered and the liquid circulation device is also battery-powered, it is possible to carry out processing operations such as drilling, drilling, and cutting anywhere, such as processing work on ceiling surfaces that was difficult with conventional equipment or systems. becomes easier.

As the battery 140, a battery that is the same as or compatible with a battery for a wet electric drill can be used. For example, a DC 18V box-type battery, which is often used in this type of power tool, can be used. Therefore, it can be used as it is as a power source for electrical components in the device without providing a transformer circuit, contributing to reduction in size and weight. Furthermore, since the spare battery and charging device can be used in common with the wet electric drill, it is possible to reduce the number of items carried during transportation and work, thereby reducing the burden on the worker.

The control device 150 has a positive power terminal of the vacuum pump 110, a positive power terminal of the tube pump 120, a first signal terminal to which a portion of various control signals input from the wet electric drill is input, and a negative power terminal of the battery 140. This includes semiconductor non-contact relays (SSR). By adopting SSR, even when the terminals are switched on and off at high speed and frequency, it has a long life and is quiet, and the device can be easily miniaturized.

The control device 150 also receives a positive power terminal of the vacuum pump 110, a negative power terminal of the vacuum pump 110, a negative power terminal of the tube pump 120, and the remainder of various control signals input from the wet electric drill. It has a terminal block having two signal terminals. Positive and negative power from the battery 140 is supplied to the terminal block via a contact relay. The contact relay and battery 140 are turned on and off by a rocker switch. By using both a non-contact relay and a contact relay, even a high-torque motor like the vacuum pump 110 can be easily driven by a general-purpose low-power battery.

The controller 150 can operate the tube pump 120 to begin supplying filtrate to the wet power drill after the vacuum pump 110 begins suctioning. Additionally, the tube pump 120 can be operated to stop supplying filtrate before the vacuum pump 110 stops suctioning. This can prevent the filtrate from overflowing from the wet electric drill.

<Filtrate relief mechanism>
As described above, the tube pump 120 has a weaker suction force and a flow rate of 1/1000 or less than the vacuum pump 110. Therefore, the water supply sources of the water supply tube 127 and the water supply tube 128 may become clogged for some reason, and the supply of filtrate to the wet electric drill may be inhibited. Or conversely, an excessive amount or pressure of filtrate may be supplied to the wet power drill.
In order to deal with these situations, some similar products include a water pressure gauge (with a built-in sensor) that measures the water pressure of the filtrate supplied to the wet electric drill, and a water pressure gauge that measures the water pressure of the filtrate supplied to the wet electric drill. Some are equipped with a solenoid valve that releases the liquid to the outside of the supply flow path.
However, the water pressure gauge and the electromagnetic valve are not only expensive in themselves, but also increase the number of components of the liquid circulation device 1, which complicates the device configuration and reduces operational reliability. In the first embodiment, the filtrate relief mechanism 130 is realized with a simple configuration described below.

The filtrate relief mechanism 130 includes, for example, a two-end type first joint 131, a water supply nozzle 134, a four-end type second joint 135, a relief valve 136, a three-end type third joint 137, and the like. It consists of multiple tubes that connect the

The water supply nozzle 134 is a nozzle for sucking the filtrate, and is provided with a filter that further filters the filtrate that has been filtered from the suspension. The water supply nozzle 134 is jointed (one-touch joint) to one end of the second joint 135 via a relief valve 136 and an extension hose. A relief valve 136 is jointed to the other end of the second joint 135.

The relief valve 136 is, for example, a mechanical valve having an appearance as shown in FIG. 5(a) and having no sensor or electrical contact, the cross-sectional structure of which is shown in FIG. 5(b). The relief valve 136 has a joint body 1361 in which a passage hole through which the filtrate passes is formed between an input end and a drain end. The inner wall of the joint body 1361 includes a poppet 1362 which is an example of a pressing member, a spring 1363 whose one end is biased by the poppet 1362, a spring receiver 1364 which receives the other end of the spring 1363, and a snap ring (which supports it). A groove is formed on the inner wall, and a spring ring (1365) is provided which is fitted into the groove to stop the movement of the spring 1363 in the axial direction. The input end side of the inner wall of the joint body 1361 is tapered to become thinner toward the input end. The end of the poppet 1362 toward the input end is also shaped to match the shape of the inner wall.

A rubber O-ring 1366 is provided at the portion where the end of the poppet 1362 contacts the inner wall of the joint body 1361, and when the fluid pressure is not strong enough to bias the spring 1363, the O-ring 1366 closes the joint. It is in close contact with the inner wall of the main body 1361 to prevent the filtrate from passing through. On the other hand, when the flow pressure increases and the poppet 1362 urges the spring 1363, the filtrate is autonomously returned to the storage tank 300 from the input end through the drain end.

A water supply tube 132 and a water supply relief tube 133 are connected to the remaining two ends of the second joint 135 . The water supply tube 132 is connected to the water supply tube 127 of the tube pump 120 through a first joint 131 . The water supply relief tube 133 is joined to the water supply relief tube 139 via the first joint 131 .

A water supply tube 128 of the tube pump 120 is connected to one end of the third joint 137 . The other end of the third joint 137 is joined to a water supply tube 139 having an attachment to a water supply hose on the wet electric drill side at its tip. A water relief tube 138 is connected to the remaining end of the third joint 137 . The water supply relief tube 133 and the water supply relief tube 138 are closed by the first joint 131 and the second joint 135 during normal operation, but if there is some abnormality in the water supply tubes 127, 132, the water supply tubes 128, 139, or the tube pump 120. When this occurs, the first joint 131 and the second joint 135 open the water supply relief tube 133 and the water supply relief tube 138, which serves to return the filtrate to the storage tank 300 through the relief valve 136.

In this way, the filtrate relief mechanism 130 can relieve the filtrate with a simple mechanical configuration without providing a water pressure gauge or a solenoid valve, so it is possible to relieve the filtrate with a simple mechanical configuration, so it is possible to relieve the filtrate with a simple mechanical configuration. A circulation device 1 can be realized.

FIG. 6 is an external perspective view showing an example of a tube routing structure, with the housing 200 and the storage tank 400 removed. The water supply nozzle 134 is arranged near the inner bottom of a filtrate reservoir 340, which will be described later, so that it can operate without any problem even when the amount of filtrate is low. The relief valve 136 is placed as close as possible to the exhaust layer unit 400.

Further, the water supply tube 127 and the water supply tube 139 (and the water supply relief tube 138) are arranged parallel to the roller head 123 of the tube pump 120, and then separated from the filtration unit 500 on the top plate 421 of the exhaust layer unit 400. It heads toward the exhaust layer unit 400 in an arc so as to be wound along the outer surface of the vacuum pump 110 exposed from the position. These tubes 127, 139 (138) may be made longer and may be wound around the outer circumference of the vacuum pump 110 one or more times.
The vacuum pump 110 generates heat during operation, but by indirectly cooling the vacuum pump 110 with these tubes 127, 139 (138) through which filtered water passes, there is no need to separately provide a cooling air mechanism, etc. It is possible to achieve thorough miniaturization.

<Storage tank>
The storage tank 300 will be explained. The storage tank 300 has one bottomed box 310, as shown, for example, in the top view of FIG. 7(a) and the bottom perspective view of FIG. 7(b). The bottomed box body 310 can be made of a translucent resin product that is substantially rectangular in top, bottom, and side views. The portion corresponding to the upper base is open. In the first embodiment, by partitioning the inner space of the bottomed box body 310 with the partition plate 320, the negative pressure generated when the vacuum pump 110 operates is strongly sucked into the inner space of the bottomed box body 310. A suspension storage 330 (recovery means) that stores the collected suspension and a filtrate storage 340 that stores the filtrate obtained by filtering the suspension are formed.

The partition plate 320 is configured, for example, by fixing a reinforcing metal frame to an outer frame of a flat plate made of resin. The metal frame may be fixed to the inner bottom of the bottomed box 310 and a pair of opposing inner walls with screws. Fixing hooks 351 and 352 for engaging and fixing the exhaust layer unit 400 are provided on the outer sides of a pair of opposing ends of the bottomed box 310 that are close to the opening, respectively. Further, a hole is formed in the upper part of the suspension storage 330, and a water absorption duct nozzle 360 to which a drainage hose from a wet electric drill is attached is fixed to the hole. Since many parts are made of resin, the weight of the storage tank 300 can be reduced.

<Exhaust layer unit>
The exhaust layer unit 400 will be explained. FIG. 8 is a structural explanatory diagram of the exhaust layer unit 400, in which (a) is a lower perspective view, (b) is a bottom view, and (c) is a side view showing the state when fixed to the storage tank 300. FIG. The exhaust layer unit 400 has a similar shape to the opening edge of the storage tank 300 and is slightly larger than the opening edge, and therefore has a lid part 410 that watertightly covers the opening edge, and a lid part 410 on the outside of the upper bottom part of the lid part 410. The exhaust layer 420 has a three-dimensional structure that is slightly smaller than the exhaust layer 420 and has a predetermined thickness.

The outer surface of the exhaust layer 420 consists of a side wall portion 421 and a top plate 422. A plurality of exhaust holes 4211 are formed in the side wall portion 421 for exhausting the gas discharged from the vacuum pump 110 to the outside of the exhaust layer. The above-described internal electrical components of the device are fixed to the top plate 422 together with the housing 200 with screws. A wiring connector 4221 is also protruded from the top plate 422 at a position away from the housing 200. The wiring connector 4221 is for inputting various control signals from the wet electric drill to the control device 150, and wiring is routed through the inner wall of the exhaust layer 420.

A hollow space is formed between the outer side of the upper bottom of the lid part 410, the inner side of the lower bottom of the exhaust layer 420, and the inner wall of the exhaust layer 420. Furthermore, a first hole 411 that communicates with the inner wall of a filter holder 510, which will be described later, is formed in a first portion of the upper bottom portion of the lid portion 410 that faces the suspension storage 330. Further, in a second portion of the upper bottom portion of the lid portion 410 that faces the filtrate storage 340, a second hole is provided which communicates with the first hole 411 via a flow path duct 423 arranged in a mountainous manner on the hollow space side. 412 is formed. Note that the flow path duct 423 has a rectangular shape when viewed from above. As a result, the filtrate flows into the second hole 412 via the first hole 411 and the flow path duct 423. Further, a third hole 413 that communicates with the intake port 1101 of the vacuum pump 110 is formed in a third portion of the upper bottom portion of the lid portion 410 that faces the filtrate storage 340 .

The second hole 412 is covered with a filtrate guide 450. The filtrate guide 450 is a baffle plate having a substantially U-shaped cross section, and is a fan-shaped gutter extending from the second hole 412 in a direction away from the suspension storage 330 . The gutter bottom and gutter side portions of the filtrate guide 450 become larger as they move away from the second hole 412, and the negative inclination angle with respect to the horizontal plane gradually increases. In other words, the cross-sectional area of the flow path gradually increases. Therefore, the filtrate flowing from the second hole 412 gradually slows down and falls quietly into the filtrate reservoir 340 according to Bernoulli's theorem (flow rate = cross-sectional area x velocity).

The third hole 413 is covered with an intake guide 460. The intake guide 460 is a baffle plate having a substantially U-shaped cross section, and is a fan-shaped gutter extending from the third hole 413 in the opposite direction to the filtrate guide 450 described above. The gutter bottom and gutter side portions of the intake guide 460 are larger as they are farther away from the third hole 413 and closer to the inlet, and the negative inclination angle with respect to the horizontal plane gradually increases. In other words, the cross-sectional area of the flow path gradually increases toward the inlet. Therefore, the air flowing from the inlet of the intake guide 460 toward the third hole 413 is guided to the intake port 1101 of the vacuum pump 110 while gradually increasing its speed. Furthermore, since it is separated from the filtrate guide 450, drops of falling filtrate or stored filtrate will not be sucked up into the intake guide 460.

A nozzle fitting for fixing the extension cable of the water supply nozzle 134 is provided at a fourth portion of the upper bottom portion of the lid portion 410 that faces the filtrate storage 340 . Further, a second joint 135 to which a relief valve 136 is connected is fixed to a fifth portion of the upper bottom portion of the lid portion 410 that faces the filtrate storage 340 .

<Filtration unit>
The filtration unit 500 is an example of a filtration means that filters a passing liquid using the negative pressure generated when the vacuum pump 110 operates, and includes a flexible filtration body and a supporting member thereof. In this embodiment, the filtration unit 500 includes a filter holder 510 attached along the periphery of the first hole 411 and a flexible filtration bag 520 that covers the filter holder 510. The filter bag 520 is made of fiber, resin, or soft metal and has a mesh so fine that it does not allow fine chips such as concrete particles generated during machining work using a wet electric drill to pass through. It can be a flexible bag. The filter bag 520 is removably attached to the filter holder 510 via an attachment having a predetermined structure. Note that the inner size of the filter bag 520 is approximately the same as the outer diameter of the filter holder 510, but is not limited thereto. For example, it may be larger than the outer diameter of the filter holder 510.

The filter holder 510 has concave surfaces formed in mutually opposing directions, as shown in the external view as viewed diagonally from above in FIG. 9(a) and the external view as viewed diagonally from below in FIG. This is a hard member having a pair of curved plates 511 and 512 having different curved surfaces. A plurality of holes are formed in each of the curved plates 511 and 512 to prevent excessive deformation of the filter bag 520 and to increase the contact area with the suspension. The relatively short curved plate 512 is, for example, arranged closer to the intake duct nozzle 360 of the suspension reservoir 330. Since the area near the bottom of the filter holder 510 is slanted, the contact area between the area near the bottom of the filter bag 520 and the suspension is larger than when the heights of the curved plates 511 and 512 are equal, improving the filtration effect. can be increased.

<How to use the liquid circulation device>
Next, an example of how the liquid circulation device 1 configured as described above is used will be described.
In advance, a predetermined amount of tap water is stored in the filtrate storage 340 of the liquid circulation device 1 for initial water supply. A worker moves this liquid circulation device 1 together with a wet electric drill to the vicinity of the work site, and performs setting work for the electrical system and liquid circulation. The electrical system setting work is a work to electrically connect the control device of the wet electric drill and the control device 150 of the liquid circulation device 1 via the wiring connector 4221. The setting work for liquid circulation is to attach the water supply hose of the wet electric drill to the attachment of the water supply tube 139 of the liquid circulation device 1, and to attach the drainage hose of the wet electric drill to the water absorption duct nozzle 360. After that, the power of the wet electric drill is turned on, and then the power of the liquid circulation device 1 is turned on.

When the wet type electric drill reaches a predetermined state (for example, a state in which work can be performed without water leakage), a control signal to start driving the vacuum pump 110 is transmitted from the wet type electric drill to the control device 150. Upon receiving this control signal, the control device 150 starts the operation of the vacuum pump 110 (suction operation), and after a certain period of time, starts the operation of the tube pump 120 (water supply operation).

When cooling water is supplied from the filtrate storage 340 to the drill bit of the wet power tool, this cooling water cools the drill bit that has been heated by frictional heat with the drilling site. The cooling water stirs up cuttings generated by drilling with a drill bit and becomes a suspension containing them. This suspension is strongly sucked through the suction port 1101 of the vacuum pump 110, the suction guide 460, the filtrate guide 450, the flow path duct 423, the filter holder 510, the water suction duct nozzle 360, and the drainage hose, and is then sucked into the suspension storage. The liquid is stored in the filter bag 330 and filtered by the filter bag 520 to become a filtrate. The flow rate of this filtrate weakens as it goes toward the outlet of the filtrate guide 450, and the filtrate does not drop into the filtrate storage 340, which is separated by the partition plate 320 from the slightly violent suspension storage 330. It falls silently and is stored. The stored filtrate is supplied to the wet electric drill through the filtrate relief mechanism 130 described above. The above operations are repeated as long as the wet electric drill continues machining work at the same location.

FIG. 10 is a side sectional view of the liquid circulation device 1 during a suction operation. During the suction operation, a part of the filtration bag 520 is bent inside the filter holder 510 (example in the first direction) due to negative pressure, and the suspension 630 sucked together with air from the water suction duct nozzle 360 is transferred to the filtration bag 520. It is sucked (extracted) from the outside to the inside. As a result, only the extracted filtrate 640 flows from the inside of the filter holder 510 to the flow path duct 423, the filtrate guide 450, and the filtrate storage 340, and the cuttings etc. in the suspension 630 are removed from the suspension 630. It is deposited in the storage 330. The precipitate is discharged as appropriate.

In the filtrate storage 330, the flow velocity of the filtrate 640 is weakened by the filtrate guide 450, and the air inlet of the intake guide 460 is disposed on the opposite side to the outlet of the filtrate guide 450, so that the filtrate 630 will not mix with the air and enter the intake port of the vacuum pump 110. Therefore, even if the suction force (negative pressure) of the vacuum pump 110 is 1000 times or more higher than that of the tube pump 120, it is possible to prevent failure of the vacuum pump 110 due to contamination of the filtrate.

When the wet type electric drill enters a state other than the predetermined state (for example, machining operation is interrupted or stopped), a control signal for stopping the drive of the vacuum pump 110 is transmitted from the wet type electric drill to the control device 150. Upon receiving this control signal, the control device 150 stops the operation of the vacuum pump 110 (suction operation), and after a certain period of time, stops the operation of the tube pump 120 (water supply operation).

FIG. 11 is a side sectional view of the liquid circulation device 1 when suction is stopped. When the vacuum pump 110 stops the suction operation, the filtrate 630 extracted inside the filtration bag 520 releases the flexure of the filtration bag 520 and moves to the outside of the filtration bag 520 (in the second direction opposite to the first direction). example). As a result, the shavings and the like that were blocking the mesh of the filter bag 520 are pushed out by the filtrate 630 into the suspension reservoir 330, and the mesh of the filter bag 520 is restored. In other words, it is automatically cleaned.

Note that the filtration bag 520 near the bottom of the filter holder 510 is bent inward more than the part that is in contact with the filter holder 510, which is a hard member, and the speed at which the deflection is released is increased immediately after the suction is stopped. . Therefore, a water flow is generated in the filter bag 520 near the bottom of the filter holder 510 due to the vibration (sifting off) when the deflection is released, and the fine chips, etc. present in that part are more effectively removed from the outside of the filter bag 520. can be released to

<Second embodiment>
A second embodiment of the present invention will be described. FIG. 12 is an external perspective view of the liquid circulation device 2 according to the second embodiment. The same parts as those of the liquid circulation device 1 according to the first embodiment are given the same reference numerals. The second embodiment differs from the liquid circulation device 1 of the first embodiment in that a power terminal 250 for transferring DC power between the battery 140 and the electrical components of the wet electric drill is added.

For example, when a power plug is provided at the end of the power line KB that connects to the electrical components of a wet electric drill, the power terminal 250 is a socket with an inner diameter and core wire size that match the outer diameter and core wire size of the power plug. An insulating member is fixed to the edge of the opening. If a socket is provided at the end of the power line KB that connects to the electrical components of the wet power drill, the power terminal 250 is a power plug of each of the above sizes that is compatible with the power socket.

According to the liquid circulation device 2 of the second embodiment, only one battery 140 can drive a wet type electric drill, so the number of batteries that must be brought to the place where processing work is performed can be minimized. In addition, the motor of a wet electric drill generally repeats temporary operation and temporary stop, but the regenerated energy generated when the motor is temporarily stopped (regenerated power when the motor decelerates rotation) By returning the battery 140 to the battery 140 without wasting it, the battery 140 can be charged. Therefore, the time during which the liquid circulation device 2 can be operated can be extended by charging the battery 140 once.

<Third embodiment>
A third embodiment of the present invention will be described. The liquid circulation device according to the third embodiment includes a power generation mechanism that generates DC power according to the suction force or exhaust force of air or filtrate by the vacuum pump 110, and charges the battery 140 with the generated DC power. This embodiment differs from the first and second embodiments in this respect.

Although not shown, the power generation mechanism is achieved by, for example, rotatably providing a small power generation windmill near the inlet of the intake duct 460, near the exhaust part of the vacuum pump 110, or near the exhaust mechanism of the exhaust layer unit 400. is possible. Alternatively, for example, it can be realized by rotatably providing a small power generation water turbine between the second hole 412 of the exhaust layer unit 400 and the gutter bottom of the filtrate guide 450. Note that the power generation mechanism is not limited to the above example, and may be based on other principles. For example, a mechanism in which a power generation magnet is provided near the rotation axis of the tube pump 120 may be adopted.

According to the liquid circulation device of the third embodiment, by effectively utilizing the strong suction force and exhaust force of the vacuum pump 110 without wasting them, the battery is more efficient than in the case without a power generation mechanism. 140 usage time can be extended.
Therefore, even in a work environment where commercial power cannot be used, such as when working outdoors, work can be continued for a relatively long time.

According to the first to third embodiments, the following advantages or effects can be obtained.
(1) The suspension generated by the wet electric drill is strongly sucked together with air from inside the filter bag 520 by the vacuum pumps 110 of the liquid circulation devices 1 and 2 using negative pressure. Therefore, regardless of the type, density, or viscosity of the cuttings, it is possible to quickly collect the suspension and quickly separate the cuttings and the filtrate, thereby avoiding leakage of the suspension. Therefore, the efficiency of drilling operations using wet power tools can be improved. Further, since the mesh of the filter bag 520 can be made finer, even if the particle size is small, it is possible to separate it with only one filter bag 520.

(2) When the filtration unit 500 has a flexible filtration bag 520 and the vacuum pump 110 starts suctioning the suspension from the outside to the inside of the filtration bag 520, a part of the filtration bag 520 When the vacuum pump 110 stops suction, the filtrate extracted inside the filtration bag 520 releases the flexure of the filtration bag 520 and flows to the outside of the filtration bag 520 (in the second direction). Head to. In other words, the filtrate pushes out the mesh of the filter bag 520 that was blocked by cuttings and the like. Therefore, the filter bag 520 is cleaned every time the work area is changed with the wet electric drill, so the usable time of one filter bag 520 is longer, and it is easier to drill holes with the wet electric drill than with similar products that do not have this mechanism. Work efficiency can be greatly improved.

(3) The tube pump 120 is provided, which starts supplying the filtrate 640 to the wet power tool after the vacuum pump 110 starts suction, and stops supplying the filtrate 640 before the vacuum pump 110 stops suction. Since only the filtrate is supplied to the wet power tool without being suctioned, overflow of the filtrate from the wet power drill is avoided.

(4) Since the battery 140 is used as a power source for the internal electrical components of the device including the vacuum pump 110 and the tube pump 120, it is possible to supply water and collect suspension anywhere.
For example, the liquid circulation device 1 can be used in places where it is difficult to route a commercial power cord or where the presence of a commercial power cord poses an obstacle, such as when constructing the ceiling of a building.
Further, since the battery 140 can be compatible with the drive power source of the wet electric drill, a spare battery of the wet electric drill can be used as the battery 140 of the liquid circulation device.

(5) One or more of the tubes connected to one end of the elastic tube 124 of the tube pump 120 and the tube connected to the other end of the elastic tube 124 are wound along the outer surface of the vacuum pump 110. Therefore, the vacuum pump 110 can be cooled without providing a separate cooling means.

(6) In the tube pump 120, the connecting portion between one end of the elastic tube 124 and the other end of the tube is covered with a translucent cover, so even when the liquid circulation device 1 is in operation, the tube pump The operational status of 120 and the presence or absence of abnormalities can be visually confirmed.

(7) A suspension storage 330 and a filtrate storage 340 are formed in the inner space of the bottomed box 310 by partitioning the inner space of the bottomed box 310 made of a transparent member with a partition plate 320. a storage tank 300, and an exhaust layer unit 400 provided with an exhaust mechanism that covers the opening of the storage tank 300 and exhausts air from the suspension storage 330 and the filtrate storage 340, and a filtration unit. 500 filtration bags 520 are attached to the suspension storage 330, and the tube pump 110 is arranged in the flow path between the inside of the filtration bags 520 and the filtrate storage 340 in the exhaust layer unit 400. Since a filtrate duct 450 is provided that blocks the flow path in the direction in which the filtrate flows and has a larger flow path cross-sectional area on the filtrate outlet side than on the filtrate inlet side, the suspension 630 and the filtrate 640 are separated from each other. It can be stored without depending on the other state.
Furthermore, a situation in which the filtrate is sucked into the intake port 1101 of the vacuum pump 110 can be avoided. Furthermore, since the storage tank 300 and the partition plate 320 are made of resin, weight reduction is also possible.

(8) Since the water supply nozzle 134 that sends the filtrate 640 to the water supply end of the tube pump 120 is arranged near the bottom of the filtrate reservoir 340, even when there is little filtrate 640 in the filtrate reservoir 340, the wet type Enables water supply to power tools.

(9) A relief valve 136 connected directly or indirectly to the water supply end and/or the water supply end of the tube pump 120 and autonomously returns the filtrate sent from the water supply nozzle 134 to the filtrate storage 340. Therefore, even without using sensors or solenoid valves, overfilling of filtered water can be prevented with a simple configuration, and the reliability of operation can be increased.

(10) The relief valve 136 includes a spring wound along the inner wall of the joint having a drainage end and a pusher that energizes or deenergizes the spring depending on the flow pressure of the filtrate sent from the water supply nozzle 134. When the pressing member biases the spring, the filtrate sent from the water supply nozzle is discharged from the drain end toward the filtrate storage 340, so no settings are required. It is possible to autonomously prevent overfeeding of filtered water.

<Modified example>
In the first to third embodiments, the vacuum pump 110 is used as an example of the first pump, and the tube pump 120 is used as an example of the second pump. A vacuum device other than the vacuum pump 110 may be used as long as it is a device.

Further, in the first to third embodiments, an example was shown in which the flow rate of the vacuum pump 110 is 500 L/min or more and the flow rate of the tube pump 120 is 0.5 L/min or less, but the performance of each pump used in the present invention is is not limited to these values. For example, the vacuum pump 110 may be replaced with a pump or vacuum device that can obtain a flow rate of 100 L/min or more.

Furthermore, in the first to third embodiments, an example has been described in which the battery 140 is fixed to the top plate 422 of the exhaust layer unit 400. It may be a space. Alternatively, the battery 140 may be electrically separated from the liquid circulation devices 1 and 2, and DC power may be supplied to electrical components within the device via a power cable of a length that does not interfere with processing operations. In addition, it is configured to be connected to a portable generator with a built-in battery or a portable power source equipped with a renewable energy charging function via a power cable of a length that does not interfere with processing operations. You can. Moreover, the electric power may be not only direct current but also alternating current. In this case, an AC/DC conversion circuit is provided as necessary. This allows the configuration of the power supply system to be made more flexible.

Further, in the first to third embodiments, when the wet electric drill is in a predetermined state, a control signal for starting driving the vacuum pump 110 is transmitted from the wet electric drill to the control device 150, and the wet electric drill is in a state other than the predetermined state. It is assumed that the wet electric drill sends a control signal to stop driving the vacuum pump 110 to the control device 150 when the wet electric drill reaches the state shown in FIG. Regardless, the control device 150 may generate it autonomously. For example, when the wet electric drill is not actually operated, but is set to prevent water leakage, the vacuum pump 110 starts/stops and the tube pump 120 starts/stops at the same timing as above. You can also set a timer so that In this way, the liquid circulation device 1 can be operated only for the purpose of automatically cleaning the filter bag 520.

Furthermore, in the first to third embodiments, an example has been described in which the storage tank 300 is configured into a suspension storage 330 and a filtrate storage 340 using one bottomed box 310 and a partition plate 320. The turbid liquid storage 330 and the filtrate storage 340 may each be configured as independent bottomed boxes.

Further, in the first to third embodiments, an example of the liquid circulation device 1 used with a wet power tool has been described, but the liquid circulation device of the present invention is applicable not only to wet power tools but also to water in an aquarium or pool. It can also be used as a circulation pump for cleaning and other water treatments.

In addition, in the first to third embodiments, an example was explained in which a flexible bag made of resin or soft metal, that is, the filter bag 520 was used as the filter, but at least a portion thereof is flexible. As long as it has a structure, the entire bag does not necessarily have to be a bag. For example, a planar filter made of resin or soft metal that covers the periphery of the first hole 411 may be used as the filter body.

<Fourth embodiment>
A fourth embodiment of the present invention will be described. The liquid circulation device according to the fourth embodiment differs from that of the first embodiment mainly in that the configurations of the storage tank 300 and the filtration unit 500 are changed.

FIG. 13(a) is a diagram showing an example of the external appearance of the liquid circulation device 4 according to the fourth embodiment, in which (a) is a front external perspective view, and (b) is a rear external external perspective view. FIG. 14 is a diagram showing an example of the external appearance of the liquid circulation device 4, in which (a) is a left side view and (b) is a right side view. FIG. 15 is a diagram showing an example of the external appearance of the liquid circulation device, in which (a) is a rear view, (b) is a front view, (c) is a top view, and (d) is a bottom view. FIG. 16 is a structural explanatory diagram of the lid attached to the upper bottom of the storage tank, in which (a) is a downward perspective view, (b) is a right side view, (c) is a front view, and (d) is a rear view. It is a diagram. FIG. 17 is a diagram showing an example of the structure of a storage tank, in which (a) is an external perspective view, (b) is a plan view, and (c) is a sectional view taken along line AA in (c). In these figures, parts having the same functions as those described in the first to third embodiments are given the same reference numerals for convenience.

Referring to FIGS. 13 to 15, the liquid circulation device 4 of the fourth embodiment includes a housing 200 having a handle 210 and a wiring connector 4221 attached to the upper surface side of an exhaust layer unit 420 attached to the upper surface of the lid part 410; The various pumps in the housing 200, internal electrical components including the pump cover 129, the battery 140, and the like are functionally the same as those described in the first embodiment, although their shapes, sizes, and arrangement are slightly different.

The handle 210 is attached to a location where the gravity is approximately equal in the front, back, left, and right directions when the liquid circulation device 4 is lifted upward (Z direction). The mounting position can also be changed afterwards. An operation switch 431 for switching ON/OFF of the liquid circulation operation is provided on the same surface of the housing 200 as the wiring connector 4221. Since the operation switch 431 can be operated after visually confirming the cable attachment status to the wiring connector 4221, water leakage due to erroneous operation can be reliably prevented.

The hose cover 241 is a bottomless box-shaped cover with a thickness (horizontal length) smaller (thin) than the top of the pump cover 129, and the tube pump 120 is visible in the surface portion when viewed from the right side. Multiple slits are formed like this. Since the hose cover 241 is thinner than the pump cover 129, miniaturization of the liquid circulation device 4 is not hindered. Further, the hose cover 241 makes it possible to visually check the state of the liquid flowing through the tube pump 120, and also protects the tube pump 120 from external forces including stress from obstacles and the like.

As shown in FIGS. 16(a) to 16(c), the storage tank of the liquid circulation device 4 is a first bottomed box made of a translucent resin product that is approximately rectangular in top view, bottom view, and side view. It is composed of a body 310 and a second bottomed box body 610. The portions corresponding to the upper bases of each are open. These bottomed boxes 310 and 610 can be constructed by stacking and fixing boxes having substantially the same external shape in the height direction (Z direction) with the lid 611 interposed therebetween. Although the height (depth) of the first bottomed box 310 and the second bottomed box 610 is approximately 1/2 of that of the storage tank of the first embodiment, this is not the case. A water absorption duct nozzle 360 to which a drainage hose from a wet electric drill (not shown) is detachably attached is provided in the first bottomed box 310 at the lower stage.

The first bottomed box body 310 is a suspension storage chamber 330 that stores the suspension sucked from the water suction duct nozzle 360 by negative pressure by partitioning the inside wall of the box body with a partition plate 321 that also serves as a filtration filter. and a primary filtrate reservoir 340 that stores the primary filtrate filtered by the partition plate 321 under the same negative pressure. In the illustrated example, the primary filtrate storage 340 is smaller than the suspension storage 330, but by changing the position of the partition plate 321, the primary filtrate storage 340 is smaller than the suspension storage 330. The size can be changed. A portion of the lid body 611 that faces the upper bottom of the primary filtrate reservoir 340 is cut out in a substantially circular shape.

The second bottomed box body 610 houses the filtration unit 500. The filtration unit 500 of the fourth embodiment includes a cylindrical filter holder 510 that extends laterally substantially parallel to the lower bottom of a second bottomed box 610, and a holder fixing part 513 that fixes the starting end side of the filter holder 510. , a water absorption part 515 that communicates with the primary filtrate storage 340 , a corner part 514 that connects the holder fixing part 513 and the water absorption part 515 , and a flexible filtration bag 520 that covers the surface of the holder fixation part 513 . It consists of:

A portion of the inner space of the second bottomed box 610 other than the filtration unit 500 serves as a secondary filtrate reservoir 350. The secondary filtrate storage 350 sucks up and stores the secondary filtrate at a higher position than the suspension storage 330 and the primary filtrate storage 340. Therefore, the supernatant portion of the secondary filtrate becomes the cleanest filtrate. Furthermore, since there is no contact between the suspension and the secondary filtrate, it is possible to reliably prevent a portion of the suspension from entering the vacuum pump.

As shown in FIGS. 17(a) to 17(c), the water suction nozzle 134 for sucking up the filtrate, the relief valve 136 for returning the filtrate in the tube to the storage tank, and the air intake duct 460 are each connected to the This is the same as in the first embodiment. The filtrate duct 450 of the first embodiment is not provided in the fourth embodiment. These parts are placed on the back surface of the lid 410 (the surface facing the second bottomed box 320) so that they are located on the inner bottom of the second bottomed box 320, avoiding the filtration unit 500, during installation. It is attached.

The support columns extending from the lid body 410 of the water suction nozzle 134 and the relief valve 136 need only have the depth of the second bottomed box body 610, so they are shorter than those of the first embodiment. Furthermore, since the tip of the relief valve 136 is located on the inner bottom surface of the second bottomed box 320, drops of filtrate are prevented from dripping, and contamination of the filtrate into the vacuum pump 110 is more reliably avoided. can do.

The liquid circulation device 4 is configured such that the vacuum pump in the housing 200 strongly sucks the air in the first bottomed box 310 and the second bottomed box 320 through the intake duct 460, that is, the storage tank 300 By creating a negative pressure inside, the suspension generated by the wet electric drill is sucked into the suspension storage 330 of the first bottomed box 310, and then filtered by the partition plate 321 to become a filtrate. It is stored in the storage 340.

The filtrate stored in the filtrate storage 340 is further sucked up by the water absorption part 515 , reaches the filter holder 510 via the corner part 514 , is filtered again by the filtration bag 520 , and is absorbed into the second bottomed box 610 . It is stored in the second filtrate storage 350. The filtrate stored in the second filtrate storage 350 is sucked up by the water suction nozzle 134 and supplied to the wet electric drill. This operation continues as long as the vacuum pump is performing suction operation. As in the first embodiment, when the suction operation of the vacuum pump stops, the filter bag 520 releases its deflection and performs a clogging cleaning function (self-cleaning function).

In such a liquid circulation device 4, cuttings and the like having relatively high density and viscosity remain in the suspension reservoir 330 and do not reach the filtrate reservoir 340. Since only small-sized particles mixed in the filtrate stored in the filtrate storage 340 are filtered by the filtration bag 520, the usable time of one filtration bag 520 is shorter than that of the first embodiment. It will be longer than Therefore, the efficiency of drilling work using a wet electric drill can be greatly improved.

In addition, since the storage tank is constructed by stacking the first bottomed box 310 and the second bottomed box 610, which have almost the same shape and size, in two stages, the number of filtrate storages can be increased from one to two. It is also possible to maintain miniaturization.

<Fifth embodiment>
A fifth embodiment of the present invention will be described. The liquid circulation device according to the fifth embodiment differs from that of the fourth embodiment mainly in that the configurations of the storage tank 300 and the filtration unit 500 are changed. The housing 200, the internal electrical components within the housing 200, the battery 140, and the like are the same as those described in the fourth embodiment.

18 and 19 are diagrams showing a structural example of a storage tank 300 according to the fifth embodiment, with FIG. 18(a) being a front external perspective view and FIG. 18(b) being a plan view. Further, FIG. 19(a) is a sectional view taken along line AA in FIG. 18(b), and FIG. 19(b) is a sectional view taken along line BB. In these figures, parts having the same functions as those described in the first to third embodiments are given the same reference numerals for convenience.

Referring to FIGS. 18 and 19, in the storage tank 300 of the fifth embodiment, a storage corresponding to the primary filtrate storage 340 does not exist in the first bottomed box 310, and the first bottomed box 310 as a whole corresponds to the suspension storage 330, and a soft porous filter 322 is present in the communication path with the second bottomed box 610 as a part corresponding to the partition plate 321 which also serves as a filtration filter. is different from that of the fourth embodiment. Further, this embodiment differs from the fourth embodiment in that a reinforcing member 516, which is an annular hard member, is provided at a portion connecting the holder fixing portion 513 and the corner portion 514, and the corner portion 514 and the water absorption portion 515.

The soft porous filter 322 is fixed to the lid of the first bottomed box 310 via a filter bracket 323 made of a hard material. As the soft porous filter 322, for example, silicone sponge can be used simply, but for purposes of increasing heat resistance and durability, polyurethane foam, epoxy foam, ceramic foam, cross-linked polyethylene foam, etc. may also be used. . Alternatively, a waterproof porous material may be used.

When the second bottomed box 610 becomes more negative in pressure than the first bottomed body 310 via the connection path with the second bottomed box 610, the soft porous filter 322 absorbs water in the suspension storage 340. The suspension is filtered by sucking upwards. The filtrate heads toward the filtration unit 500, and the cuttings and the like in the suspension naturally fall into the first bottomed box 310. On the other hand, when the negative pressure is released, the soft porous filter 322 bends downward, and the vibration at that time causes the filtrate to flow downward, thereby preventing clogging, similar to the filtration unit 500.

The storage tank 300 of the fifth embodiment is also different from the fourth embodiment in that a filter guide 700 made of a hard material such as stainless steel, carbon, or ceramic is provided on the inner bottom surface of the second bottomed box body 610. different from others.
The filter guide 700 is for reinforcing the deformation resistance of the second bottomed box body 610 and for placing the filter bag 520 at a position away from the inner bottom surface, and is formed into a substantially U-shape when viewed from the front. , is formed into a substantially H-shape in plan view. That is, the filter guide 700 has a pair of filters whose vertically lower end surfaces abut against the inner bottom surface of the second bottomed box 610 and whose side surfaces abut against a pair of opposing side walls of the second bottomed box 610. It is configured to include side plates 701 and 702, and a connecting plate 703 that connects the vertically upper end surfaces of the pair of side plates 701 and 702. The filter guide 700 prevents the second bottomed box 610 from deforming inward due to negative pressure, thereby preventing damage. A plurality of holes 7031 are formed in the connecting plate 703. The presence of these holes 7031 makes it easier for the filtrate in the filter bag 520 to fall. A recessed portion for placing the filter bag 520 may be formed at a predetermined portion of the connecting plate 703. This facilitates positioning of the filter bag 520.

Since the filtration bag 520 is placed on the connection plate 703 of the filtration body guide 700 that is apart from the inner bottom surface of the second bottomed box 610, the filtrate stored in the second filtrate storage 350 and the filtration bag 520 are separated from each other. is separated, creating a pressure difference between the inside and outside of the filtration bag 520, which can improve the filtration speed. Furthermore, deterioration of the filter bag 520 due to contact with the filtrate is suppressed. The higher the height of the pair of side plates 701 and 702, and the greater the number of holes 7031 in the connecting plate 703, the more remarkable the effect becomes. Furthermore, since the lateral size of the filter bag 520 can be increased, the filtration efficiency is increased.

Note that the shapes of the filter bag 520 and the filter guide 700 are not limited to the examples shown in FIGS. 18 and 19, and may be any shape as long as they perform the same function.

DESCRIPTION OF SYMBOLS 1, 2, 4...Liquid circulation device, 110...Vacuum pump, 120...Tube pump, 130...Filtrate relief mechanism, 140...Battery, 150...Control device, 250... ...Power terminal, 300...Storage tank, 310...First bottomed box, 610...Second bottomed box, 322...Soft porous filter, 330...Suspension liquid Storage, 340... Filtrate storage, 350... Second filtrate storage, 400... Exhaust layer unit, 450... Filtrate duct, 460... Intake duct, 500... Filtration unit, 520...Filtering bag, 700...Filtering body guide.

Claims (7)

A liquid circulation device that collects a suspension from a wet power tool, extracts a filtrate from the collected suspension, and supplies it to the wet power tool,
a flexible filter body,
a first pump that sucks the suspension toward a first direction of the filter;
a second pump that starts supplying the filtrate to the wet power tool after the first pump starts suction and stops the supply before the first pump stops suction;
Equipped with
A portion of the filter body is bent when the first pump starts suctioning, and when the first pump stops suctioning, the bending is canceled, and the filtrate that has passed through it is deflected in the first direction. It goes in the opposite second direction,
The first pump is a vacuum pump that sucks the suspension together with air at a stronger negative pressure than the second pump,
The second pump is a tube pump that moves the filtrate within the elastic tube by pressing the elastic tube with a rotating roller,
A liquid circulation device characterized in that the elastic tube is covered with a translucent cover . a storage tank in which a suspension storage for storing the suspension is formed in an inner space of a bottomed box made of a transparent member;
an exhaust layer unit provided with an exhaust mechanism that covers the storage tank and exhausts air from the suspension storage;
In the exhaust layer unit, the flow path of the filtrate that has passed through the filter body is blocked in the direction in which the first pump is disposed, and the flow is directed toward the filtrate outlet side rather than the filtrate inlet side. characterized by being provided with a filtrate duct having a large cross-sectional area;
The liquid circulation device according to claim 1 . characterized by having a water supply nozzle that sends the filtrate to the water supply end of the second pump;
The liquid circulation device according to claim 2. The invention is characterized by comprising a relief valve that is connected directly or indirectly to the water supply end and/or the water supply end of the second pump and that autonomously returns the filtrate present in the water supply nozzle to the storage tank. ,
The liquid circulation device according to claim 3 . The relief valve includes a spring wound along an inner wall of a joint having a drainage end, and a pressing member that energizes or deenergizes the spring depending on the flow pressure of the filtrate present in the water supply nozzle. characterized in that when the pressing member biases the spring, the filtrate present in the water supply nozzle is discharged from the drainage end toward the storage tank.
The liquid circulation device according to claim 4 . A liquid circulation device that filters a suspension collected from a wet power tool and supplies the same to the wet power tool , wherein electrical components including a vacuum pump and an inner space thereof become under negative pressure when the vacuum pump is operated. It has a storage tank,
The storage tank includes a collection means for collecting the suspension by the negative pressure, and a filtration means for filtering the collected suspension,
The filtration means allows the filtrate to pass in the first direction by being partially bent by the negative pressure, and the deflection is canceled by the release of the negative pressure so that the filtrate passing through the filtrate is allowed to pass through the filtrate in the first direction. It has a flexible filter body that guides in a second direction opposite to the direction,
The storage tank has two bottomed boxes stacked in the height direction,
A suspension storage is formed in the lower box with a bottom to store the suspension collected by the recovery means, and the bottomed box in the upper part stores the filtrate filtered by the filtration means. characterized in that a filtrate storage is formed at a higher position than the suspension storage;
Liquid circulation device. The filtration means places the filter at a position vertically upwardly away from the inner bottom surface while reinforcing the deformation resistance of the storage tank by contacting the inner bottom surface of the storage tank and at least a pair of opposing side walls. characterized by having a filter body guide for
The liquid circulation device according to claim 6 .

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