JP2010155211A - Minute bubble generation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately keep a function of an apparatus with simple structure even in case of occurrence of reverse flow of water due to abnormal stopping of the apparatus causing no breakage of the apparatus. <P>SOLUTION: The minute bubble generation apparatus (1) takes in water and air, produces minute bubble-containing water containing minute bubbles and discharges it. The apparatus (1) includes an air introducing part (31) having an intake port (38), an air mixing part (3) mixing air taken in through the air introducing part (31) with water to form air-mixed water, a pressurizing pump (4), a pressurized vessel (10) for bubbling by temporarily storing the air-mixed water under pressure, and a discharge nozzle (8). A reverse flow preventive device (80) for preventing the reverse flow of the air-mixed water is provided between the pressurized vessel (10) and the air mixing part (3). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fine bubble generating device, and more particularly to a mechanism for preventing backflow of water or the like when an emergency stop occurs.

Conventionally, several devices of this type have been proposed (Patent Document 1, etc.). For example, this device mixes water and air to form air-mixed water, pressurizes the air-mixed water with a pump to dissolve air in the water, and discharges the air-dissolved water immersed in a bath at once. A large amount of fine bubbles are formed in the bathtub by discharging from the nozzle. As described above, when the action of fine bubbles is received during bathing, a warm bath effect and the like are obtained, so that bathing can be enjoyed more relaxedly.
JP-A-5-68700

  By the way, in the apparatus having such a structure, for example, when the apparatus is stopped, the pressurized water may instantaneously generate a reverse flow, and the water may flow into the upstream side of the pressure pump. In addition, when the device stops unexpectedly due to a power failure or the like, water may flow backward at a stretch. In such a case, a load due to the backflow is applied to the upstream side of the pressurizing pump, which may cause a problem in a member provided there.

  For example, a path for introducing air is in communication with the water flow path on the upstream side of the pressurizing pump. However, there is a risk of causing failure or breeding of germs at a portion such as a backflow prevention valve provided there. is there. In general, a filter that prevents foreign matters from entering is often provided at the intake port of air or water, but in that case, the filter may be damaged by a load caused by backflow.

  The present invention has been made in view of the above points, and the object of the present invention is to properly maintain the function of the device without breaking even when a reverse flow of water occurs due to an emergency stop or the like. The object is to provide a microbubble generator.

  In order to achieve the above object, the present invention provides a fine bubble generating device (1) that takes in water and air to generate and discharge fine bubble-containing water containing fine bubbles, and is configured to discharge air from the outside. An air introduction part (31) having an intake port (38) to be taken in; an air mixing part (3) for mixing air and water taken in by the air introduction part (31) to form an air-mixed water; and the air Connected to the pressurized pump (4) that pressurizes and feeds the mixed water, the pressurized container (10) that temporarily stores the air-mixed water under pressure and performs bubbling, and the pressurized container (10) A discharge nozzle (8) for discharging the water containing fine bubbles, and preventing backflow of the air-mixed water between the pressure vessel (10) and the air mixing section (3). A device (80) is provided.

  According to such a configuration, the backflow prevention device (80) is provided between the pressurized container (10) and the air mixing section (3), so that the pressure pump (4) stops suddenly due to a power failure or the like. Even if this occurs, it is possible to prevent the pressurized air-mixed water from flowing back upstream from the backflow prevention device (80).

  For example, the backflow prevention device (80) includes an outlet (85) connected to the pressurized container (10) side and an inlet (84) connected to the air mixing unit (3) side. A closed container-like casing (82), which is displaceable in the casing (82) between a closed position for closing the inlet (84) and an open position for opening the inlet (84). A float body (83) is provided, and the float body (83) is displaced to the open position when the air-mixed water is flowing forward, and is displaced to the closed position when the air-mixed water is backflowed. It can be set.

  If it does so, the backflow of air mixing water can be prevented effectively, although it is a comparatively simple structure.

  Further, the float body (83) and the casing (82) have a pair of switch portions (88) that come into contact with each other when the float body (83) is in the open position and the switch is turned on. It is preferable that emergency stop means (90) for emergency stop of the pressurizing pump (4) is provided when the switch section (88) is turned off.

  In this way, the backflow prevention device (80) can also serve as an emergency stop device that prevents idling of the pressurization pump (4), thus preventing damage to the pressurization pump (4) while simplifying the members. Can and is efficient.

  In particular, the suction nozzle (7) for sucking water in the water tank (6) where the discharge nozzle (8) is arranged, and the water supply for feeding the water taken in by the suction nozzle (7) to the air mixing section (3) An open / close-type backflow prevention valve (78a) that allows the suction nozzle (7) to flow into the pressure pump (4) and does not allow flow into the water tank (6). It is effective when the is provided.

  In this case, if a backflow of air-mixed water occurs, the backflow prevention valve (78a) prevents the outflow, which may cause an excessive load on the water supply path (71) and cause damage or water leakage. is there.

  Further, a suction nozzle (7) for sucking water in the water tank (6) where the discharge nozzle (8) is arranged, and water supply for feeding water taken in by the suction nozzle (7) to the air mixing section (3) It is effective even when a filter (91) is provided in the suction nozzle (7).

  In this case as well, when the air-mixed water flows backward, it is possible to prevent an excessive load from being applied to the filter (91), and foreign matter is mixed into the device by the filter (91), and the backflow prevention device (80) etc. This is because biting can be prevented.

  As described above, according to the fine bubble generating device of the present invention, even if a back flow of water occurs, the function can be properly maintained without breaking the device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

-Configuration of microbubble generator-
FIG. 1 shows a schematic configuration of a microbubble generator (1) according to a first embodiment to which the present invention is applied. This fine bubble generator (1) is attached to a bathtub (water tank) (6) such as a unit bath for the purpose of a warm bathing effect on the human body, etc. It is set to be installed in a slightly separated place.

  The microbubble generator (1) includes a circulation channel (30) for circulating water (hot water) in the bathtub (6), and takes air into the water circulating through the circulation channel (30). Generate water containing fine bubbles (also called fine bubble-containing water) and discharge the fine bubble-containing water into the bathtub (6) so that the fine bubbles are continuously formed in the bathtub (6). It is configured.

  Specifically, the fine bubble generator (1) includes a suction nozzle (7), an air introduction part (31), an air mixing part (3), a pressure pump (4), a dissolved water generator (pressure vessel) ) (10), discharge nozzle (8), backflow prevention device (80), emergency stop (emergency stop means) (90), and the like.

  Of these, the suction nozzle (7), air mixing section (3), backflow prevention device (80), pressure pump (4), dissolved water generator (10), discharge nozzle (8) are connected to the pipe (2 ) Is connected in series in this order, and the water in the bathtub (6) taken from the suction nozzle (7) into the fine bubble generator (1) is discharged from the discharge nozzle (8) and circulated repeatedly. A flow path (30) is formed.

(Suction nozzle)
The suction nozzle (7) is provided to take in the water in the bathtub (6), and is arranged near the bottom of the bathtub (6) so as to sink into the water stored in the bathtub (6). . The suction nozzle (7) has a suction port (37) that takes in water from the bathtub (6) at its tip, and is connected to one end of a flexible hose, etc. (which constitutes part of the pipe (2)) Thus, the water supply path (71) is configured. The water supply path (71) extends to the dissolved water generator (10) and communicates with the air mixing unit (3), the pressure pump (4), and the dissolved water generator (10).

  Further, the suction nozzle (7) of the present embodiment is provided with expiratory water supply means (72) for supplying expiratory water for starting the pressurizing pump (4), which will be separately described later. .

(Air introduction part)
The air introduction part (31) is provided mainly for taking in air from the outside, and has an intake air amount adjustment valve (5c), a check valve (5d), etc., each of which is an intake pipe (5b). It is connected.

  An intake port (38) for taking in air from the outside is open to the atmosphere at the tip of the intake pipe (5b). This intake port (38) captures dust and the like floating in the air. An intake filter (9b) is provided to prevent entry into the apparatus.

  An air intake adjustment valve (open / close valve) (5c) for adjusting (limiting) the flow rate of air introduced into the air mixing section (3) is provided downstream of the air introduction section (31), and air mixing A check valve (5d) for preventing air and water in the section (3) from flowing backward to the upstream side of the suction pipe (5b) is provided in a line in this order from the upstream side, and the suction pipe (5b) The end of is connected to the air mixing section (3).

  The intake air amount adjusting valve (5c) is set so that the intake amount of air per unit time does not exceed a predetermined amount, and can be adjusted as necessary.

(Air mixing part)
The air mixing part (3) is provided for introducing a predetermined amount of air into the water taken in from the bathtub (6) and flows, for example, a Y-shaped or T-shaped branch in appearance. Consists of piping and the like, one end branched into two branches communicates with the suction nozzle (7), and the other end communicates with the air introduction part (31). Then, the water in the bathtub (6) flows from one end thereof, and the air taken in by the air introduction portion (31) flows from the other end so as to be drawn into the water flow, and is approximately at a predetermined rate. Water in which air and water are mixed (also referred to as air-mixed water) is formed and sucked into the pressure pump (4). A backflow prevention device (80) is provided downstream of the air mixing section (3), which will be described later.

(Pressure pump)
The pressure pump (4) is provided to pressurize the air mixture water thus obtained and send it to the dissolved water generator (10), and at the same time circulate the water in the bathtub (6) in the circulation channel (30). It has been. A so-called cascade pump (vortex pump) is used for the pressurizing pump (4) of the present embodiment. For example, the pressurizing pump (4) is pressurized to about 2 to 3 kg / cm 2 (0.2 to 0.3 MPa) with a gauge pressure. Water can be sent. The pressurizing pump (4) is a non-self-priming pump that is commonly used, and requires water (expiratory water) to fill the pump chamber in which the impeller is accommodated at the time of starting. .

(Dissolved water generator)
The dissolved water generator (10) is a substantially sealed pressure vessel that accepts the air-mixed water pressurized by the pressure pump (4) and the air is dissolved at a relatively high concentration in the water. Water (this state of water is also referred to as air-dissolved water) and is a major device in the fine bubble generator (1).

  That is, as shown in FIG. 2, air-mixed water is temporarily stored in the tank (11) in a pressurized state, the gas-liquid is forcibly contacted by bubbling the air-mixed water, It is configured to efficiently generate air-dissolved water by promoting the dissolution of air.

  Specifically, the tank (11) includes a disc-shaped bottom portion (11a), a cylindrical body portion (11b) extending upward from an outer peripheral edge of the bottom portion (11a), and a body portion (11b). And a lid (11c) that closes the upper opening. An inlet (14) is opened at the center of the upper surface of the lid (11c), and an outlet (20) is opened at the lower part of the trunk (11b). The inlet (14) is connected to the inlet pipe (26). ), The outlet (20) communicates with the pipe (2) constituting the circulation channel (30) via the outlet pipe (27).

  The tank (11) is provided with a cylindrical partition wall (13) that extends upward from the bottom (11a) and is formed concentrically with the cylindrical body (11b). The partition wall (13) is formed so that the upper end portion thereof is separated from the lid portion (11c), the dissolution promoting portion (15) that is a space surrounded by the partition wall (13), and the partition wall ( The gas-liquid separation part (19) which is a space between the body part (11) and the body part (11b) communicates with each other via a communication path (18) formed above the partition wall (13). In addition, the liquid level height of the air-mixed water or air-dissolved water (also simply referred to as air-dissolved water) in the tank (11) is adjusted so that the liquid level is above the upper end of the partition wall (13). .

  Inside the partition wall (13) of the tank (11), a cylindrical guide tube extending downward from the lid (11c) of the tank (11) and formed concentrically with the partition wall (13) (12) is provided, and a guide portion (17) is formed between the guide tube (12) and the partition wall (13). The guide tube (12) is formed such that its lower end is separated from the bottom (11a), and between the guide tube (12) and the bottom (11a), the dissolution promoting portion (15) and the guide portion ( A guide passage (16) communicating with 17) is formed.

  An injection nozzle (28) protruding inward of the tank (11) is connected to the introduction port (14). The injection nozzle (28) is formed in a hollow disk shape, and a plurality of fine-hole injection ports (28a) are formed on the lower surface thereof. Then, the air-mixed water introduced into the injection nozzle (28) from the introduction port (14) is vigorously injected from these injection ports (28a) toward the dissolution promoting portion (15), and the dissolution promoting portion (15) Vigorous bubbles and water flow are formed to promote dissolution of air into the water (bubbling treatment).

  The lid (11c) of the tank (11) is provided with an exhaust valve (40) for discharging excess air remaining in the tank (11).

  That is, the exhaust valve (40) has a casing (41), a spherical float (43) accommodated so as to float on the dissolved air flowing into the casing (41), and a float (43) on one end side. A valve portion (42) connected to the other end of the valve body (42) for opening and closing an exhaust port (45) formed in the casing (41) is provided.

  A cylindrical exhaust pipe (21) communicating with the exhaust valve (40) is provided below the exhaust valve (40), the upper end thereof being connected to the casing (41) of the exhaust valve (40), and the lower end being connected to the tank (11 ) So that it protrudes into contact with the liquid surface of the dissolved air.

  Also, below the exhaust pipe (21), there are four rod-shaped fixing members (24) so that the float (43) does not malfunction due to the influence of the flow of dissolved water in the dissolved water generator (10). ) Is connected to the disk-shaped rectifying plate (25).

  The air dissolved water flows into the exhaust pipe (21) by pressurization, and the liquid level reaches the height in the casing (41) of the exhaust valve (40). And when the excess air does not accumulate so much in the dissolved water generator (10), the float (43) is rising, the valve body (42) is approaching the horizontal state, and the valve portion is the exhaust port (45 ) In close contact (closed position).

  When surplus air increases in the dissolved water generator (10) and the liquid level of the dissolved air in the casing (41) decreases, the float (43) descends (open position). Then, since the valve body (42) is inclined and the valve part is separated from the exhaust port (45) of the casing (41), surplus air accumulated in the casing (41) is discharged from the exhaust port (45) to the outside at once. . When excess air is discharged, the float (43) rises and returns to the closed position.

  Thus, the dissolved air formed by being introduced into the dissolution promoting portion (15) flows into the guide portion (17) through the guide passage (16) and then flows upward through the guide portion (17). Then, it flows into the gas-liquid separator (19) through the communication passage (18), flows downward, and is led out from the outlet (20) (see the arrow in FIG. 2).

(Discharge nozzle)
The discharge nozzle (8) is provided for generating a large amount of fine bubbles in the air-dissolved water and discharging the fine bubble-containing water containing the fine bubbles into the bathtub (6). It is placed near the bottom of the bathtub (6) so as to sink into the water stored inside. The discharge nozzle (8) is connected to one end of a discharge path (which constitutes a part of the pipe (2)) such as a flexible hose, and the other end communicates with the dissolved water generator (10). ing.

  In the passage through which the dissolved air is provided, which is provided inside the discharge nozzle (8), a throttle part (39) having a reduced flow path cross-sectional area, a so-called orifice is formed. As a result, when the air-dissolved water passes through the orifice, the pressure is rapidly reduced to generate a large amount of fine bubbles, and the generated fine bubbles are discharged into the bathtub (6) together with water.

(Expiration water supply means)
By the way, as described above, in this fine bubble generating device (1), it is necessary to supply expiratory water to the pressurizing pump (4) at the start of operation. It has been devised.

  That is, in this fine bubble generating device (1), a manual pump unit (pumping member) (72) is provided in the suction nozzle (7) as a priming water supply means.

  FIG. 3 schematically shows the portion of the suction nozzle (7). As shown in the figure, the suction nozzle (7) is provided integrally with the nozzle body (73) having a suction opening (37) that opens to the end, and the nozzle body (73). It has a throat portion (74) in which a cylindrical communication passage communicating with the port (37) is formed, and a pump portion (72) provided integrally at the projecting end of the throat portion (74). A water-permeable filter (75) is detachably mounted on the large-diameter opening end of the suction port (37) in the nozzle body (73) by a support frame (76) so as to cover the opening end. The filter (75) prevents the backflow prevention device (80) and the like from being caught by foreign matter.

  The pump part (72) is formed of a flexible material such as a synthetic resin, and has a hollow bowl shape so that the user can easily grasp it and has a shape restoring property. A pump chamber (72a) separated from the outside by the body is formed. The pump chamber (72a) can be reversibly reduced by the user gripping or releasing the pump section (72), and returns to a bowl shape when there is no load.

  A pump suction port (suction port) (77) communicating with the throat portion (74) is provided at one end portion (tub (6) side) in the longitudinal direction of the pump portion (72), and the other end portion A pump discharge port (discharge port) (78) communicating with the water supply path (71) is provided on the (pressure pump (4) side), and the pump suction port (77) is connected to the pump chamber (72a). An openable first valve body (77a) (backflow prevention valve) that allows inflow and does not allow outflow from the pump chamber (72a) is provided so as to be swingable. The pump discharge port (78) has a pump chamber ( An openable second valve body (78a) (backflow prevention valve) that allows outflow from 72a) but does not allow inflow into the pump chamber (72a) is provided to be swingable.

  Therefore, when the user supplies exhalation water to the pressurizing pump (4) in order to start the operation of the fine bubble generating device (1), the user only needs to hold or release the pump part (72).

  That is, when the user grasps the pump part (72), as shown in FIG. 3B, the pump chamber (72a) shrinks, and the water filled in the pump chamber (72a) draws the second valve body (78a). The water is pushed and opened from the pump discharge port (78) toward the water supply path (71), that is, the pressure pump (4).

  When the user releases his hand from the pump chamber (72a), as shown in FIG. 3 (a), the pump portion (72) returns to its original bowl shape, and the inside of the pump chamber (72a) Therefore, the first valve body (77a) is drawn and the pump suction port (77) is opened, and new water is taken into the pump chamber (72a) from the suction port (37).

  By repeating this operation, water in the bathtub (6) can be supplied as expiratory water for the pressure pump (4). Once the pressure pump (4) is actuated, the suction action causes the first valve body (77a) and the second valve body (78a) to both swing to the open side, and the pump suction port (77) and Since both pump discharge ports (78) are in an open state, water in the bathtub (6) can be taken in without any trouble.

(Backflow prevention device)
The backflow prevention device (80) is provided to prevent backflow of the air-mixed water. In this embodiment, the backflow prevention device (80) is disposed between the air mixing section (3) and the pressure pump (4). . FIG. 4 schematically shows the structure of the backflow prevention device (80).

  As shown in the figure, the backflow prevention device (80) includes a substantially sealed container-like casing (82) having a water passage space (81) therein and a water passage space (81) of the casing (82). The float body (83) accommodated is included.

  The casing (82) has an upper wall (82a) and a lower wall (82b), and a side wall (82c) connected to the upper wall (82a) and the lower wall (82b). It is formed and the water flow space (81) is defined in the inside. The lower wall (82b) has an inlet (84) connected to the air mixing section (3) side, and the upper wall (82c) has an outlet (85) connected to the pressure pump (4) side. ) Is open, and the water flow space (81) communicates with the pressure pump (4) and the air mixing section (3).

  In addition, a cylindrical guide tube (on the bottom surface of the upper wall (82a) facing the water passing space (81) protrudes downward from the approximate center and the tip is located near the approximate center of the water passing space (81) ( 86). A sealing material (87) made of an elastic member is disposed on the upper surface of the lower wall (82b) facing the water flow space (81) so as to surround the inflow port (84).

  The float body (83) is made of a relatively light material, and has a disk-shaped lid (83a) whose outer shape is smaller than the inner diameter of the water flow space (81), and upwards from the approximate center of the lid (83a). It has a cylindrical shaft portion (83b) that protrudes and has an outer diameter smaller than the inner diameter of the guide tube (86). The float body (83) has its shaft portion (83b) guided by the guide tube (86) so that it can freely enter and exit the tube, and can be displaced in the vertical direction within the water flow space (81). It has become.

  That is, as shown in FIG. 4 (a), the float body (83) is located on the upper side in the water flow space (81) so that the shaft portion (83b) penetrates deeply into the guide tube (86). As shown in FIG. 4 (b), the lid (83a) is in close contact with the sealing material (87) and is located on the lower side in the water flow space (81), as shown in FIG. 4 (b). It can be displaced to a closed position that closes the inlet (84).

  The backflow prevention device (80) is provided with a pair of idling prevention switches (switch units) (88) including a first contact (88a) and a second contact (88b).

  That is, the first contact (88a) is disposed on the lower surface surrounded by the guide tube (86) of the upper wall (82a) of the casing (82), and is disposed on the tip surface of the shaft (83b) of the float body (83). When the second contact (88b) is provided and the float body (83) is in the open position, the first contact (88a) and the second contact (88b) come into contact with each other and the switch is turned on. The first contact (88a) and the second contact (88b) are set apart from each other and turned off when the float body (83) is not in the open position.

  When this idling prevention switch (88) is turned on or off, the operation of the pressurization pump (4) is controlled by the emergency stop (90).

(Emergency stop)
The emergency stop unit (90) is provided for emergency stop of the pressure pump (4) according to the state of the idling prevention switch (88). It is composed of software programmed to control the pressurizing pump (4) in cooperation. In cooperation with the idling prevention switch (88), cut off the current supply to the pressurization pump (4) to make an emergency stop, or set the pressurization pump (4) that has made an emergency stop so that it can be reactivated. It has a function.

-Operation of microbubble generator-
The operation during normal operation will be explained. First, with the suction nozzle (7) and the discharge nozzle (8) submerged in the bathtub (6) where water is stored, the expiratory water supply means is used. Supply the priming water to the pressurizing pump (4) so that the pressurizing pump (4) can be driven, and turn on the main power switch that operates the microbubble generator (1). If it does so, a pressurization pump (4) will drive and water in bathtub (6) will come to circulate through circulation channel (30).

  At this time, in the air mixing section (3), air is drawn from the air introduction section (31) by the circulating water flow to form air mixed water. Then, the air-mixed water is pumped to the dissolved water generator (10) by the pressurizing pump (4), and the bubbling process is performed under pressure as described above to promote the dissolution of air in the water and dissolve the air. Water is formed and discharged from the discharge nozzle (8) into the bathtub (6) as water containing fine bubbles. By continuously performing such an operation, a large amount of fine bubbles are constantly formed in the bathtub (6) without changing the amount of water.

  When the operation is stopped, for example, when the main power switch is turned off, the pressure pump (4) stops, water circulation and air intake are eliminated, and the pressure in the dissolved water generator (10) returns to normal pressure. The water that was inside the pressurized pump (4) and dissolved water generator (10) is naturally discharged.

  However, the dissolved water generator (10) stores pressurized air-dissolved water, and therefore, for example, a pressure reduction control mechanism is provided such that the pressure pump (4) stops while gradually weakening the rotation. If the pressure pump (4) stops unexpectedly, such as when the power pump is cut off due to a power failure, etc., the dissolved water may flow backward to the upstream side when the pressure pump (4) stops.

  In such a case, for example, failure of the check valve (5d) provided in the air introduction part (31) and the propagation of various germs may cause problems in the upstream member of the dissolved water generator (10). There is a fear. In particular, in the fine bubble generating device (1) of the present embodiment, since the exhalation water supply means as described above is provided in the suction nozzle (7), when a backflow of dissolved air occurs, the second valve body (78a ) Is closed and excessive internal pressure is applied to the water supply path (71), and the second valve body (78a) and the water supply path (71) may be broken.

  Therefore, in this embodiment, a backflow prevention device (80) is provided so that these members can be appropriately protected.

  That is, in the normal operation state, as shown in FIG. 4A, the pressurizing pump (4) always causes water to flow from the air mixing unit (3) side to the pressurizing pump (4) side. Therefore, in the water flow space (81), the float body (83) is pushed up by the momentum of the water flowing in the water flow space (81), and the inflow port (84) is opened. Always held in the open position.

  Then, when the pressurizing pump (4) is stopped and the reverse flow of the dissolved air is generated, as shown in FIG. 4 (b), the air flows from the outlet (85) to the water flow space (81). Since the dissolved water flows in, the lid portion (83a) is pushed with the momentum, the float body (83) is lowered, and the inflow port (84) is closed. Accordingly, the reverse flow of the air-dissolved water can be effectively prevented from flowing into the upstream side from the water flow space (81) as described above, so that the priming water supply means and the like can be appropriately protected.

  Furthermore, this backflow prevention device (80) also has a function to prevent idling of the pressurizing pump (4), and the function is controlled by the emergency stop (90) and idling prevention switch (88) described above. It has come to be demonstrated.

  FIG. 5 shows the flow of the idling prevention control by the emergency stop unit (90). First, since this control is provided to prevent idling of the pressurizing pump (4), the emergency stop (90) determines whether the pressurizing pump (4) is operating. (Step S1). While the pressure pump (4) is in operation (YES in step S1), it is always determined by the emergency stop (90) whether or not the idling prevention switch (88) is in the off state (step S2). .

  And the amount of water flowing into the water flow space (81) of the backflow prevention device (80) decreases, for example, the idling prevention switch (88) is off, for example, the suction port (37) of the suction nozzle (7) is blocked. When the float body (83) is displaced downward from the open position (YES in step S2), the pressurization pump (4) is urgently stopped by the emergency stop unit (90) (step S3).

  This is because if the amount of water sent to the pressurization pump (4) decreases and the pressurization pump (4) is not filled with water and is in an idling state, the pressurization pump (4) may be broken. The float body (83) is held in an open position as long as an appropriate amount of water flow is maintained by adjusting the buoyancy balance or holding force by a magnet, so that the pressure pump (4) is in an idle operation. It is set so that when it reaches the water flow rate, it falls in balance with the water flow rate.

  Therefore, the idling of the pressure pump (4) is effectively prevented by the backflow prevention device (80) and the like, and the durability is excellent.

  As described above, according to the fine bubble generating device (1) of the present invention, even if the pressure pump (4) abnormally stops and the reverse flow of water occurs, the device is simple in structure. The function can be properly maintained without being broken.

  In addition, the microbubble generator concerning this invention is not limited to the said embodiment, The other various structure is included.

  For example, in the above embodiment, the suction nozzle (7) is provided with the priming water supply means. However, as shown in FIG. 6, the filter (91) may be simply attached to the suction port (37). Good. In this case as well, if an excessive load is applied to the filter (91) due to backflow, the filter (91) may be damaged, which is effective in preventing this. This filter (91) is also advantageous in that foreign matter is prevented from entering the apparatus and biting into the backflow prevention device (80) and causing trouble.

  The backflow prevention device (80) may be disposed between the pressure pump (4) and the dissolved water generator (10). In short, it is only necessary that the pressurized water flows backward and does not apply a load to the air introduction part (31), the suction nozzle (7) and the like.

  An idling prevention switch (88) may be provided in the middle of the current supply path of the pressure pump (4) to stop the pressure pump (4) directly. In that case, if the emergency stop (90) is controlled so that the pressurization pump (4) can be started even when the idling prevention switch (88) is off when starting the pressurization pump (4) again, Good.

It is a conceptual diagram which shows the whole structure of the fine bubble generator which concerns on this invention. It is a schematic sectional drawing of a dissolved water generator. It is a figure for demonstrating the structure of a suction nozzle part. (A) And (b) represents the different operation | movement at the time of expiration water supply. It is the schematic which shows a backflow prevention apparatus. (A) and (b) show different states. It is a flowchart which shows the flow of idling prevention control. It is the schematic which shows the principal part of another embodiment of the microbubble generator which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine bubble generator 3 Air mixing part 4 Pressure pump 5c Intake amount adjustment valve 5d Check valve 6 Bathtub (water tank)
7 Suction nozzle 8 Discharge nozzle 10 Dissolved water generator (pressure vessel)
Reference Signs List 30 Circulating Channel 31 Air Introducing Port 37 Suction Port 38 Inlet Port 40 Exhaust Valve 71 Water Supply Path 72 Pump Portion
72a Pump chamber 77 Pump suction port 77a First valve body 78 Pump discharge port 78a Second valve body 80 Backflow prevention device 81 Water flow space 82 Casing 82a Upper wall 82b Lower wall 82c Side wall 83 Float body 83a Lid portion 83b Shaft portion 84 Flow Inlet 85 Outlet 86 Guide cylinder 87 Sealing material 88 Empty operation prevention switch (switch part)
88a 1st contact 88b 2nd contact 90 Emergency stop part (emergency stop means)
91 Filter

Claims (5)

A fine bubble generator (1) that takes in water and air to produce and discharge fine bubble-containing water containing fine bubbles,
An air inlet (31) having an air inlet (38) for taking in air from the outside;
An air mixing section (3) that mixes air and water taken in by the air introduction section (31) to form an air-mixed water;
A pressure pump (4) for pressurizing and feeding the air-mixed water;
A pressurized container (10) that temporarily stores the air-mixed water under pressure and performs bubbling;
A discharge nozzle (8) connected to the pressurized container (10) for discharging the water containing fine bubbles,
A microbubble generator, wherein a backflow prevention device (80) for preventing a backflow of the air-mixed water is provided between the pressurized container (10) and the air mixing section (3). It is a fine bubble generator of Claim 1, Comprising:
The backflow prevention device (80) is provided with an outlet (85) connected to the pressurized container (10) side and an inlet (84) connected to the air mixing section (3) side. Having a sealed container-like casing (82),
In the casing (82), there is provided a float body (83) displaceable between a closed position for closing the inlet (84) and an open position for opening the inlet (84),
The float body (83) is set so as to be displaced to the open position when the air-mixed water is flowing forward and to the closed position when the air-mixed water is backflowed. apparatus. It is a fine bubble generator of Claim 2, Comprising:
The float body (83) and the casing (82) are provided with a pair of switch portions (88) that come into contact with each other when the float body (83) is in the open position and the switch is turned on. And
A microbubble generator characterized by comprising emergency stop means (90) for emergency stop of the pressurizing pump (4) when the switch part (88) is turned off. It is a fine bubble generator as described in any one of Claims 1-3,
A suction nozzle (7) for sucking water in a water tank (6) in which the discharge nozzle (8) is disposed;
A water supply path (71) for supplying water taken in by the suction nozzle (7) to the air mixing section (3),
The suction nozzle (7) is provided with an open / close-type backflow prevention valve (78a) that allows inflow to the pressure pump (4) but does not allow outflow to the water tank (6). A fine bubble generator. It is a fine bubble generator as described in any one of Claims 1-3,
A suction nozzle (7) for sucking water in a water tank (6) in which the discharge nozzle (8) is disposed;
A water supply path (71) for supplying water taken in by the suction nozzle (7) to the air mixing section (3),
A fine bubble generator, wherein the suction nozzle (7) is provided with a filter (91).

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