JP2015047527A - Ejector device and pipe washing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ejector device having an excellent washing effect and a pipe washing device comprising the same.SOLUTION: An ejector device 4 comprises: a nozzle part 40 for reducing pressure of liquid; a suction part 41 to which air is sucked; a mixing part 42 for mixing the liquid from the nozzle part 40 and the sucked air; and a diffuser part 43 for forming an expanded passage 430. On an inner peripheral surface forming the expanded passage 430, a salient part 45 which is formed into a shape extending in a spiral state from a shaft of the expanded passage 430 serving as a center of extension, and promotes rotation flowing for rotating the mixed fluid which is mixed in the mixing part 42, is provided.

Description

  The present invention relates to an ejector device that ejects a gas-liquid mixed fluid containing fine bubbles and a pipe cleaning device including the ejector device.

  Patent documents 1, 2, and 3 are known as devices for ejecting a gas-liquid mixed fluid. The apparatus of Patent Document 1 has a flow path through which water accelerated by water pressure of water passes, and a gas introduction path for sucking an external gas with a negative pressure generated by the flow of water. A mixing aspirator is provided. Furthermore, the device of Patent Document 1 includes a tubular body that is integrally connected downstream of the aspirator and through which the fluid discharged from the aspirator flows down.

  In the tubular body, spiral ridges having a longitudinal axis as an axis are formed on an inner peripheral wall that forms a constant channel cross-sectional area from the upstream end to the downstream end. With this configuration, the mixed fluid of water and air that has flowed into the tubular body from the aspirator is agitated while being guided by the ridges and swirling spirally. Thereby, the bubble of the air in water refines | miniaturizes and a micro bubble generate | occur | produces, and a micro bubble is discharged | emitted from the exit of a tubular body outside.

  Similar to the tubular body of Patent Document 1, the device of Patent Document 2 has a spiral flow path extending from the inlet to the outlet in the inside of a cylindrical casing that forms a constant channel cross-sectional area. ing. The spiral flow path is formed by partitioning the inside of the casing with a flow path forming member. The flow path forming member is formed in a spiral twisted plate shape.

  Patent Document 3 discloses an apparatus for purifying sewage by stirring and atomizing a mixed fluid of sewage and outside air with an ejector device.

Japanese Patent No. 4194522 JP 2008-161822 A Japanese Patent Laid-Open No. 5-15893

  However, when the technology for forming the swirling flow in the pipes described in Patent Documents 1 and 2 is applied to the ejector device, even if the swirling flow forming member is provided from the inlet to the outlet in the pipe, In terms of miniaturization, an apparatus having an excellent cleaning effect cannot be provided. That is, when a structure that forms a swirl flow is provided throughout the tube of the ejector device, the amount of gas suction decreases due to an increase in pressure loss, or sufficient agitation cannot be obtained depending on the location where the swirl flow is formed. There is a problem that miniaturization does not promote.

  Then, this invention is made | formed in view of the said problem, and it aims at providing the ejector apparatus which has the outstanding cleaning effect, and a piping cleaning apparatus provided with the same.

  In order to achieve the above object, the following technical means are adopted. In addition, the code | symbol in the parenthesis as described in a claim and each means of the following shows the correspondence with the specific means as described in embodiment mentioned later as one aspect.

That is, one of the inventions related to the disclosed ejector device includes a nozzle part (40) for reducing the pressure of the inflowing liquid, a suction part (41) for sucking gas by a suction force by the liquid ejected from the nozzle part, A mixing section (42) that forms a passage further downstream than the section and forms a passage that mixes the liquid ejected from the nozzle section and the gas sucked from the suction section, and the cross-sectional area of the passage toward the downstream. Forming an enlarged passage (430) that expands, and a diffuser part (43) that decelerates the mixed fluid mixed in the mixing part and increases the pressure,
The inner peripheral surface forming the enlarged passage of the diffuser portion has a shape extending spirally around the axis of the enlarged passage, and a swirling flow promoting portion that promotes a swirling flow that swirls the mixed fluid mixed in the mixing portion (45) is provided.

  According to the present invention, by providing the swirl flow promoting portion in the expansion passage of the diffuser portion, the gas can be sucked in the mixing portion, and the gas-liquid mixed fluid in a good state is reduced in flow rate due to the pressure increase in the diffuser portion. It is possible to stir by turning while suppressing. Thereby, since the suction of the gas and the stirring of the mixed fluid can be performed appropriately, the miniaturization of the bubbles can be promoted, and the gas-liquid mixed fluid having a high cleaning effect can be provided. Therefore, this invention can provide the ejector apparatus which has the outstanding cleaning effect.

One of the inventions related to the disclosed pipe cleaning apparatus includes an ejector device (4) according to any of the other inventions, a reheating heat exchanger (17) for heating water in the bathtub (50), and a bathtub. It is a pipe to be connected, and is a pipe for connecting a bath pipe (14) through which hot water supplied to the bathtub flows when filling the bathtub, and a bathtub and a heat exchanger for reheating, A recirculation pipe (15) through which the water in the bathtub circulates when retreating the water in the bathtub,
The ejector device is characterized in that the mixed fluid that has been swirled by the swirling flow promoting portion is supplied into a bath pipe and a retreat pipe.

  According to the present invention, it is possible to clean the bath piping and the replenishment piping by providing the ejector device that can promote the refinement of bubbles and provide a gas-liquid mixed fluid having a high cleaning effect. Therefore, the present invention can provide a pipe cleaning apparatus that can clean dirt accumulated in the pipe by repeatedly flowing the bathtub water and obtain an excellent cleaning effect.

It is a schematic sectional drawing for demonstrating the structure of the ejector apparatus which is one Embodiment of this invention. It is a figure for constituting a pipe washing device provided with an ejector device of the present invention. It is a schematic diagram for demonstrating a 2nd example about the position which provides the rotational flow formation part of an ejector apparatus. It is a schematic diagram for demonstrating a 3rd example about the position which provides the rotational flow formation part of an ejector apparatus. It is a schematic diagram for demonstrating the 4th example about the position which provides the rotational flow formation part of an ejector apparatus. It is a schematic diagram for demonstrating another example about an ejector apparatus.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that each embodiment can be specifically combined, but also combinations of the embodiments even if they are not clearly indicated unless there is a problem with the combination. Is also possible.

(Embodiment)
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a configuration of an ejector device 4 which is an example of an ejector device according to the present invention.

  As shown in FIG. 1, the ejector device 4 includes at least a nozzle part 40, a suction part 41, a mixing part 42, and a diffuser part 43. The nozzle part 40 depressurizes the flowing liquid.

  The nozzle portion 40 forms a series of passages including an inflow portion 401, a narrow passage 402, a small diameter passage 403, an expansion passage 404, and an ejection portion 405. The inflow portion 401 corresponds to an inlet portion for liquid flowing into the ejector device 4 and is connected to an external pipe or the like. The narrowing passage 402 is a passage extending downstream from the inflow portion 401, and the passage cross-sectional area gradually narrows from the inflow portion 401. The narrowing passage 402 is a passage that forms a conical space that is tapered toward the downstream. The small-diameter passage 403 is a passage located at the downstream end of the narrow passage 412, and has the smallest passage cross-sectional area among the passages formed by the nozzle portion 40.

  The expansion passage 404 is a passage connected to the small-diameter passage 403 and formed so that the passage cross-sectional area gradually increases toward the downstream. The expansion passage 404 is a passage that forms an inverted conical space that expands toward the downstream. The ejection portion 405 constitutes an ejection port that is the most downstream end portion of the nozzle portion 40 and is an outlet of the expanded passage 404. Therefore, the mixing unit 42 and the diffuser unit 43 exist downstream of the ejection unit 405. The liquid that has flowed from the inflow portion 401 through the outside pipe flows in the axial direction through the narrow passage 402, the small diameter passage 403, and the expansion passage 404 in the axial direction, and is decompressed.

  The mixing portion 42 is a portion provided on the downstream side of the nozzle portion 40 in the body of the ejector device 4. The mixing unit 42 constitutes a channel that mixes the liquid ejected from the ejection port of the expansion channel 404 and the external gas sucked from the suction unit 41. The mixing unit 42 is provided on the downstream side of the suction passage 411 of the suction unit 41 and is also a passage that mixes the high-speed liquid flow from the nozzle unit 40 and the gas sucked from the suction passage 411. The mixing unit 42 is further connected to the diffuser unit 43 on the downstream side. The body of the ejector device 4 forms a cylindrical body that is open at both ends.

  The diffuser portion 43 is a portion provided on the downstream side of the mixing portion 42 in the body of the ejector device 4. The diffuser portion 43 is formed in a shape in which the passage cross-sectional area gradually increases toward the downstream. That is, the diffuser portion 43 has an enlarged passage 430 whose passage cross-sectional area gradually increases from the upstream end portion 431 to the downstream end portion 432. The diffuser unit 43 has an action of decelerating the flow of the mixed fluid mixed in the mixing unit 42 to increase the fluid pressure, that is, a function of converting velocity energy of the mixed fluid into pressure energy.

  The ejector device 4 may further include a cylindrical body portion 44 on the downstream side of the diffuser portion 43. The cylindrical body portion 44 forms a straight passage extending further downstream from the downstream end portion 432 constituting the outlet of the diffuser portion 43. The cylindrical body portion 44 forms a passage having a constant passage cross-sectional area. The outlet 441 of the cylindrical body portion 44 is connected to an external pipe disposed on the downstream side of the ejector device 4.

  When the ejector device 4 does not include the cylindrical body portion 44, the downstream end portion 432 of the diffuser portion 43 is connected to an external pipe disposed on the downstream side of the ejector device 4.

  External gas is sucked into the suction portion 41 by the suction action caused by the ejection of the liquid from the nozzle portion 40. A suction passage 411 that is an inlet of the suction unit 41 is provided in the body of the ejector device 4. The suction passage 411 is arranged such that its axial direction is shifted from the axial center of the body of the ejector device 4 and penetrates the body so that gas flows in a direction substantially perpendicular to the axial direction of the body. The external gas is sucked into the suction passage 411 by the liquid ejected from the ejection portion 405 of the nozzle portion 40 and swirls so as to draw an arc along the inner peripheral surface of the mixing portion 42. It flows down toward the heart. The gas introduced into the passage of the mixing unit 42 mixes with the liquid ejected from the ejection unit 405, and the mixed fluid becomes a fluid that generates fine bubbles when flowing through the diffuser unit 43.

  On the inner peripheral surface forming the enlarged passage 430 of the diffuser portion 43, a swirl flow promoting portion having a shape extending spirally around the axis of the enlarged passage 430 is provided. The swirl flow promoting unit has a function of promoting swirl flow that swirls while increasing the pressure of the mixed fluid mixed in the mixing unit 42. The swirl flow promoting portion is a guide portion that guides the flow of fluid in the enlarged passage 430. The swirl flow promoting portion is constituted by, for example, a ridge 45 having a shape protruding from an inner peripheral surface forming the enlarged passage 430 and extending spirally.

  The projecting ridge 45 starts in a midway position between the upstream end 431 and the downstream end 432 in the enlarged passage 430 and extends in a spiral shape in the axial direction. That is, the ridge 45 does not start from the upstream end 431 of the enlarged passage 430 and extends spirally toward the downstream, but is a position advanced from the upstream end 431 by a predetermined length downstream in the axial direction. It starts with The ridge 45 is provided to advance spirally in the axial direction while rotating in the same rotational direction as the rotational direction of the swirling flow generated in the enlarged passage 430. For example, the ridge 45 forms a plurality of peaks whose cross-sectional shape is a predetermined pitch in the axial direction.

  The ridges 45 constitute a series of spiral ridges extending continuously in the diffuser portion 43. As a result, the ridge 45 constitutes a swirl flow promoting portion that continues in a predetermined range of the enlarged passage 430 from the upstream start point to the downstream end point. In the enlarged passage 430, the mixed fluid flows spirally along the ridge 45 and the inner peripheral wall from the starting point of the ridge 45 at a midpoint between the upstream end 431 and the downstream end 432, and the swirling flow is generated. To occur.

  Furthermore, it is preferable that the ridge 45 is started from the central position between the upstream end 431 and the downstream end 432 in the enlarged passage 430 or from the downstream in the axial direction from the central position. According to this configuration, by not providing the swirl flow promoting portion in the vicinity of the upstream end portion 431 of the expansion passage 430, it is possible to suppress an increase in pressure loss due to the protrusion 45 in the upstream region of the expansion passage 430. Thereby, the gas suction amount from the suction part 41 can be ensured. Accordingly, a sufficient amount of gas and liquid can be mixed in the mixing section 42, and further, this good mixed fluid is swirled in the downstream area by the ridge 45, so that the fragmentation of the bubbles can be promoted. .

  Further, the inner peripheral surface 440 forming the passage of the cylindrical body portion 44 is provided with a swirl flow promoting portion having a shape extending spirally around the passage axis. The swirl flow promoting unit has a function of continuously swirling the swirl flow generated in the diffuser unit 43. The swirl flow promoting portion is a guide portion that guides the fluid flow in the passage of the cylindrical body portion 44. This swirl flow promoting portion is constituted by a protruding ridge portion 46 that protrudes from the inner peripheral surface 440 and extends in a spiral manner, for example, similarly to the protruding ridge portion 45 provided in the diffuser portion 43.

  The ridge 46 starts from the upstream end in the passage of the cylindrical body 44 and extends in the axial direction spirally. The ridges 46 are formed so as to form a predetermined pitch in the axial direction, and advance in a spiral shape in the axial direction while rotating in the rotational direction in the same direction as the rotational direction of the swirling flow generated in the expansion passage 430. Is provided. The ridge 45 and the ridge 46 are formed so that the spiral rotation direction is the same direction toward the downstream side.

  The ridge 46 forms a series of spiral ridges that continuously extend from the axial upstream end to the downstream end near the outlet 441 in the cylindrical body portion 44. As a result, the ridge 46 constitutes a swirl flow promoting portion that continues in the entire passage from the upstream start point to the downstream end point. Therefore, in the passage of the cylindrical body portion 44, the mixed fluid flows spirally along the ridge 46 and the inner peripheral surface 440 from the inlet portion to the outlet portion of the cylindrical body portion 44, and the swirling flow continues.

  For example, the ridge 45 and the ridge 46 can be manufactured by cutting the inner peripheral wall of the diffuser portion 43 and the inner peripheral wall of the cylindrical body portion 44. Further, the ridge portions 45 and the ridge portions 46 can be formed by integral molding when the diffuser portion 43 and the cylindrical body portion 44 are manufactured by injection molding or the like using a mold. Moreover, each part of the ejector device 4 is manufactured in the ejector device 4 by integrally joining a plurality of members divided in the axial direction by brazing, welding (TIG welding, arc welding, spot welding, etc.), adhesion, or the like. Can do. Moreover, each part of the ejector apparatus 4 can be formed with the same material. Each part of the ejector device 4 can be made of, for example, a metal such as stainless steel or a resin material.

  The bubbles generated in the enlarged passage 430 of the diffuser portion 43 will be described. The ejector device 4 generates a negative pressure portion in the passage in the nozzle portion 40 due to pressure fluctuation caused by a difference in liquid flow velocity. A suction force is generated by the generation of the negative pressure, and external gas is sucked into the ejector device 4 from the suction portion 41. Thus, the ejector device 4 sucks in the gas from the outside by restricting the flow path by the nozzle portion 40 and reducing the internal pressure. At this time, the larger the negative pressure generated in the nozzle section 40, the larger the gas suction amount.

  The sucked air and liquid are mixed by the mixing unit 42 and are increased in pressure as the gas-liquid mixed fluid is expanded by the passage cross-sectional area of the diffuser unit 43, and the flow velocity is reduced. The gas-liquid mixed fluid flowing through the expansion passage 430 has a flow velocity that decreases until reaching the ridge 45 of the diffuser portion 43, and enters the stage where the swirl flow is promoted when reaching the ridge 45. Thus, stirring of the fluid is promoted. That is, by extending the ridge 45 from the upstream end 431 of the diffuser portion 43 in a spiral manner from the middle position toward the downstream, ensuring the amount of gas sucked and sufficient mixing of gas and liquid Can bring. And since the favorable mixed fluid from which this effect was acquired can be stirred by formation of a swirl flow, according to the ejector apparatus 4, the mixed fluid which has the air bubble fully refined | miniaturized can be produced | generated.

  Next, a pipe cleaning device provided with the ejector device 4 will be described. This pipe cleaning apparatus is an apparatus for cleaning the inside of various pipes with a gas-liquid mixed fluid ejected from the ejector apparatus 4. Here, as shown in FIG. 2, an example of an apparatus for cleaning piping connected to the bathtub 50 will be described.

  As shown in FIG. 2, the hot water supply device 100 includes a pipe cleaning device including the ejector device 4. The hot water supply apparatus 100 includes a heat pump unit 20 that boiles high-temperature water, a tank 10, a bathtub 50, a reheating heat exchanger 17, various pipes, and various valves in addition to the pipe cleaning apparatus.

  The tank 10 is a container for storing hot water used for hot water supply. The tank 10 is a metal container having excellent corrosion resistance, for example, stainless steel, and a heat insulating material (not shown) is disposed on the outer peripheral portion. Can keep warm over time.

  Connected to the bottom of the tank 10 is an introduction pipe 11 as an introduction flow path for supplying tap water into the tank 10. The introduction pipe 11 is provided with a pressure reducing valve 22. The pressure reducing valve 22 can reduce the water pressure of the tap water flowing through the introduction pipe 11 to a predetermined pressure, or can prevent the back flow of hot water in the case of water interruption or the like. The introduction pipe 11 is provided with a water supply pipe 11 </ b> A that branches from a portion upstream of the introduction port in the tank 10. The downstream end of the water supply pipe 11 </ b> A is connected to a hot water supply mixing valve 24 and a bath mixing valve 25.

  Connected to the uppermost part of the tank 10 is a high-temperature take-out pipe 12 as a hot-water supply passage for deriving high-temperature hot water among hot water for hot water stored in the tank 10. A discharge pipe provided with a relief valve 23 is connected midway along the path of the high temperature take-out pipe 12. When the pressure in the tank 10 rises above a predetermined pressure, the relief valve 23 is opened to discharge the hot water in the tank 10 to the outside so as not to damage the tank 10 and the like.

  The heat pump side circuit 21 connects the lower part and the upper part of the tank 10. Hot water discharged from the heat pump unit 20 side through the heat pump side circuit 21 flows into the upper portion of the tank 10. A part of the heat pump side circuit 21 serves as a water side passage of the water / refrigerant heat exchanger in the heat pump unit 20.

  The heat pump unit 20 includes a heat pump cycle that uses carbon dioxide having a low critical temperature as a refrigerant, and a water supply pump installed in the heat pump side circuit 21. According to the supercritical heat pump cycle, hot water having a temperature higher than that of a general heat pump cycle, for example, about 85 ° C. to 90 ° C. can be stored in the tank 10.

  The heat pump unit 20 is configured to operate according to a control signal from the control device, and to display the operating state on the operation panel. The heat pump unit 20 performs a boiling operation for heating hot water in the tank 10 by controlling the number of revolutions of the compressor, mainly using the late-night power in the midnight time zone, which is inexpensively set. In addition, the heat pump unit 20 performs a boiling operation when the amount of stored hot water in the tank 10 becomes insufficient even in a time zone other than the midnight time zone. Further, the rotational speed of the compressor is controlled by the control device so that a prescribed capacity is obtained under various operating conditions.

  The hot pipe 14 is connected so that a bath pipe 14 as a hot water pipe to the bathtub 50 branches. The high-temperature take-out pipe 12 is a hot water supply pipe that guides hot water whose temperature is adjusted to a set temperature to a hot water supply terminal (curan, shower, etc.) as a terminal at the downstream end thereof. A hot water supply mixing valve 24, a hot water supply thermistor (not shown), a flow rate counter 27, and a check valve 60 are provided in the middle of the flow path of the high temperature extraction pipe 12. The hot water supply thermistor outputs an electric signal for detecting the temperature of the hot water mixed by the hot water supply mixing valve 24 to the control device. The flow rate counter 27 detects the flow of hot water and outputs a detection signal to the control device.

  The downstream end of the bath pipe 14 is connected to the return pipe 15 of the bathtub water circuit, and communicates with the adapter 51 of the bathtub 50 via the return pipe 15. The bath pipe 14 is a pipe that guides hot water whose temperature is adjusted to a set temperature into the bathtub 50 when hot water is filled in the bathtub 50, hot water, hot water, or the like. In the middle of the flow path of the bath pipe 14, a bath mixing valve 25, a bath thermistor (not shown), a hot water solenoid valve 26, a check valve 30, and a hot water flow rate counter are sequentially arranged downstream. 28, a check valve 31 and an ejector device 4 are provided.

  The ejector device 4 is installed such that the inflow portion 401 of the nozzle portion 40 is connected to the piping on the hot water filling solenoid valve 26 side, and the outlet 441 of the cylindrical body portion 44 is connected to the piping on the bathtub 50 side. ing.

  When the hot water solenoid valve 26 is in the open state, the water flowing down the bath pipe 14 flows into the nozzle portion 40 from the inflow portion 401 and is decompressed, so that external air is sucked and the mixing portion 42 is sucked. This produces a gas-liquid mixed fluid in which water and air are mixed. And the ejector apparatus 4 spouts the gas-liquid mixed fluid containing a fine bubble toward the inside of the piping by the side of the bathtub 50, or the inside of the return piping 15 by forming a swirl flow, being pressurized by the diffuser part 43. By ejecting the gas-liquid mixed fluid from the ejector device 4, the bath pipe 14 extending to the bathtub 50, the return pipe 15, the bathtub water-side passage 17 a of the reheating heat exchanger 17, the outgoing pipe 16, and the like can be washed. it can. As described above, the pipe cleaning apparatus can clean the dirt accumulated in the pipe by repeatedly circulating the bath water dirty with human sebum and the like.

  Further, a drain valve 68 is provided in the pipe connecting between the bath mixing valve 25 and the hot water solenoid valve 26 and between the check valve 30 and the hot water flow rate counter 28. The hot water supply mixing valve 24 and the bath mixing valve 25 are temperature control valves that adjust the temperature of hot water discharged from the ends of the high temperature take-out pipe 12 and the bath pipe 14, respectively.

  The bath thermistor outputs an electrical signal for detecting the temperature in the bath pipe 14 downstream of the bath mixing valve 25 to the control device. The hot water solenoid valve 26 is a valve that opens and closes the passage of the bath pipe 14, and is controlled by the control device when hot water is filled into the bathtub 50, hot water, hot water, or the like. The hot water flow rate counter 28 detects the flow of hot water at the outlet of the mixing valve 25 for bath and outputs a detection signal to the control device. When the hot water flow rate counter 28 detects the flow of hot water at the outlet of the bath mixing valve 25, it indicates that the hot water solenoid valve 26 of the bath pipe 14 is opened and discharged.

  The check valves 30 and 31 are valves for preventing the bath water circulating in the bath water circuit from flowing back to the bath mixing valve 25 side. A circulation temperature thermistor (not shown) is provided in the outgoing pipe 16 and outputs an electrical signal for detecting the temperature of the bathtub water circulating in the bathtub water circuit to the control device. A bath circulation sensor (not shown) is a flowing water sensor capable of detecting whether or not bathtub water is circulating in the bathtub water circuit. The reheating thermistor (not shown) is provided in the return pipe 15 and outputs an electric signal for detecting the temperature of the bath water after being heated by the reheating heat exchanger 17 to the control device.

  The water level sensor 29 is a sensor that detects the amount of hot water in the bathtub filled in the bathtub 50, in other words, a water pressure for obtaining the water level in the bathtub 50, and outputs a water pressure signal to the control device. The bath circulation pump 19 is an electric pump that pumps the bathtub water in the bathtub 50 to the chasing heat exchanger 17, and its operation is controlled by a control device.

  The hot water supply apparatus 100 includes a reheating heat exchanger 17 disposed outside the tank 10, and a primary circuit 13 that connects the reheating heat exchanger 17 and the inside of the tank 10. The inlet portion of the hot water supply water side passage 17 b in the reheating heat exchanger 17 is connected to the uppermost portion of the tank 10.

  The outlet portion of the hot water supply water side passage 17b is connected to the intermediate portion of the tank 10 by piping. The primary side circulation pump 18 is controlled by the control device, and can circulate hot water in the tank 10 and high temperature water boiled by the heat pump unit 20 to the primary side circuit 13.

  When the reheating operation is performed, the bath circulation pump 19 and the primary circulation pump 18 are driven. Thereby, the bathtub water in the bathtub 50 circulates in the bathtub water circuit, and the high-temperature water in the tank 10 circulates in the primary side circuit 13. The bathtub water is heated by exchanging heat with the high-temperature water in the tank 10 in the bathtub water-side passage 17a of the reheating heat exchanger 17. In the chasing operation, the control is continued until the bath water temperature detected by the circulation temperature thermistor reaches the set temperature.

  Next, another example of the position where the swirl flow forming portion of the ejector device 4 is provided will be described with reference to FIGS.

  The second example shown in FIG. 3 is an ejector device 4 </ b> A in which the cylindrical body 44 is not provided with the convex strip portion 46, but the convex strip portion 45 is provided only in the diffuser portion 43. That is, the ejector device 4 </ b> A starts from a position set between the upstream end portion 431 and the downstream end portion 432 in the enlarged passage 430 of the diffuser portion 43, and swings in the axial direction spirally extending to the downstream end portion 432. It has a flow promotion part.

  The third example shown in FIG. 4 is an ejector device 4B in which a swirl flow promoting part is provided only in the diffuser part 43, as in the second example. Further, the ejector device 4B starts from a position in the middle of the enlarged passage 430 of the diffuser portion 43 set between the upstream end portion 431 and the downstream end portion 432, and spirals to a position upstream from the downstream end portion 432. A swirl flow promoting portion extending in the axial direction is provided.

  As shown in FIG. 5, the ejector device 4 </ b> C as the fourth example includes a cylindrical body portion from the upstream end portion of the cylindrical body portion 44 in addition to the ridge 45 provided at the same position as in the third example. 44 has a ridge 46 extending in the axial direction spirally to a position upstream of the outlet 441 of the outlet 44. Thus, the swirl flow promoting portion provided in the cylindrical body portion 44 may not be provided over the entire axial direction of the cylindrical body portion 44.

  Below, the effect which the ejector apparatus 4 brings is described. The ejector device 4 includes a nozzle portion 40 for decompressing the liquid, a suction portion 41 for sucking the gas, a mixing portion 42 for forming a passage for mixing the liquid from the nozzle portion 40 and the sucked gas, and an enlarged passage And a diffuser portion 43 that forms 430. A swirling flow promoting portion that promotes a swirling flow that swirls the mixed fluid mixed in the mixing portion 42, having a shape extending spirally around the axis of the expanding passage 430 on the inner peripheral surface forming the expanding passage 430. Is provided.

  According to this configuration, by providing the swirl flow promoting portion in the enlarged passage 430 of the diffuser portion 43, the gas can be sufficiently sucked by the mixing portion 42, and the gas-liquid mixed fluid in a good state can be supplied to the diffuser portion 43. Stirring can be achieved by forming a swirling flow while suppressing a decrease in flow rate due to pressure increase. Thereby, since the suction | inhalation of gas and stirring of mixed fluid can be performed appropriately, refinement | miniaturization of a bubble can be accelerated | stimulated. The gas-liquid mixed fluid having sufficiently fine bubbles contributes to an increase in the surface area with respect to the cleaning surface by the surface adsorption action by the fine bubbles. Therefore, the gas-liquid mixed fluid with a high cleaning effect can be provided, and the ejector device 4 having an excellent cleaning effect can be obtained.

  The swirl flow promoting portion of the ejector device 4 is provided so as to start in a spiral from an intermediate position between the upstream end portion 431 and the downstream end portion 432 in the enlarged passage 430.

  According to this configuration, by not providing the swirl flow promoting portion at the upstream end 431 of the expansion passage 430, it is possible to suppress an increase in pressure loss due to the ridge 45 at the start portion of the expansion passage 430. Thereby, the pressure loss in the start part of the expansion channel | path 430 can be suppressed, the suction force in the mixing part 42 can be ensured, and the gas suction | inhalation amount from the suction part 41 can fully be obtained. Accordingly, a sufficient amount of gas and liquid can be mixed in the mixing section 42, and this good gas-liquid mixed fluid is swung by the ridge 45, so that the fragmentation of bubbles can be promoted. . Accordingly, it is possible to provide the ejector device 4 that balances the gas suction amount and the stirring effect by the swirling flow.

  The ejector device 4 includes a cylindrical body portion 44 that forms a passage that extends further downstream from the downstream end portion 432 of the diffuser portion 43 and has a constant passage cross-sectional area. The swirl flow promoting portion provided in the diffuser portion 43 is provided to extend spirally continuously to the inner peripheral surface 440 of the cylindrical body portion 44. The swirl flow promoted in the diffuser portion 43 continues also in the cylindrical body portion 44.

  According to this, following the formation of the swirling flow in the diffuser portion 43, the swirling flow is also formed in the cylindrical body portion 44, whereby the generation range of the swirling flow can be lengthened. Thereby, the agitation range of the gas-liquid mixed fluid can be enlarged to further promote the miniaturization of bubbles. Therefore, the ejector apparatus 4 which provides the gas-liquid mixed fluid with a high cleaning effect is obtained.

  Further, the pipe cleaning device includes the ejector device 4, a reheating heat exchanger 17 for heating the water in the bathtub 50, a bath piping 14 connected to the bathtub 50, and the bathtub 50 and the reheating heat exchanger 17. And a plumbing pipe (for example, a return pipe 15). The ejector device 4 supplies the mixed fluid that has been swirled by the swirling flow promoting unit into the bath pipe 14 and the reheating pipe.

  According to this, the inside of the pipe 14 for a bath and the piping for a reheating are wash | cleaned by the jet flow from the ejector apparatus 4 which has said effect, and it accumulates in a pipe by repeated circulation of the bath water by a reheating operation etc. The dirty dirt can be washed.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the above-described embodiment, the swirl flow promoting portion is configured by the protruding ridge portion 45 and the protruding ridge portion 46 having a shape protruding from the inner peripheral surface forming the passage and extending spirally, but is not limited to this configuration. Each swirl flow promoting portion may be constituted by, for example, a spirally extending groove portion formed on the inner peripheral surface forming the passage.

  Further, the ridge 45, the ridge 46, and the groove may be spirally extended continuously without being interrupted in the middle, or the swirl flow promoting portion consisting of a plurality of parts that are interrupted in the middle may be provided. The form which comprises may be sufficient. In short, the swirl flow promoting portion may be any as long as the mixed fluid can be circulated as a swirl flow in each passage of the diffuser portion 43 and the cylindrical body portion 44.

  In the above embodiment, the mixing part 42 is a part where liquid and gas are mixed in a passage formed by an enlarged tube similar to the diffuser part 43, but is not limited to this form. The mixing unit 42 may be configured by a straight pipe that forms a predetermined length of a passage having a constant passage cross-sectional area, instead of the expansion pipe. An ejector device 4D corresponding to this embodiment is as shown in FIG. In addition, the ejector device 4D does not include the ridge portion 46 like the ejector device 4A, but includes only the ridge portion 45 of the diffuser portion 43.

  In the said embodiment, although the diffuser part 43 is demonstrated as a part provided in the downstream of the mixing part 42, it is not limited to this form. Since the diffuser portion 43 forms a passage that expands as the passage cross-sectional area goes downstream, for example, when the mixing portion 42 is an enlarged passage, a part of the diffuser portion 43 overlaps the mixing portion 42. It may be.

  The mixing unit 42 and the diffuser unit 43 in the above embodiment can also be collectively defined as a boosting unit.

4, 4A, 4B, 4C, 4D ... Ejector device 40 ... Nozzle part 41 ... Suction part 42 ... Mixing part 43 ... Diffuser part 45 ... Projection (swirl flow promoting part)
430 ... Expanded passage

Claims (4)

A nozzle part (40) for depressurizing the inflowing liquid;
A suction part (41) in which gas is sucked by the suction force of the liquid ejected from the nozzle part;
A mixing portion (42) that forms a passage provided further downstream than the nozzle portion, and forms a passage for mixing the liquid ejected from the nozzle portion and the gas sucked from the suction portion;
A diffuser part (43) that forms an enlarged passage (430) whose passage cross-sectional area increases toward the downstream, decelerates the mixed fluid mixed in the mixing part and increases the pressure;
With
The inner peripheral surface forming the expansion passage of the diffuser portion has a shape extending spirally around the axis of the expansion passage, and promotes a swirl flow that swirls the mixed fluid mixed in the mixing portion An ejector device characterized in that a swirling flow promoting portion (45) is provided.   The swirl flow promoting portion is provided so as to start from a position between the upstream end portion (431) and the downstream end portion (432) in the enlarged passage and extend in the spiral shape. 2. The ejector device according to 1. A passage extending further downstream from the downstream end of the diffuser portion, the tubular body portion (44) forming a passage having a constant passage cross-sectional area,
The swirl flow promoting portion provided in the diffuser portion is provided continuously extending to the inner peripheral surface (440) of the cylindrical body portion, and the swirl flow promoted in the diffuser portion is The ejector device according to claim 2, wherein the ejector device is also continued in the cylindrical body portion. An ejector device (4) according to any one of claims 1 to 3;
A reheating heat exchanger (17) for heating the water in the bathtub (50);
A pipe connected to the bathtub, and a pipe for hot water (14) through which hot water supplied to the bathtub flows when filling the bathtub.
A piping for connecting the bathtub and the heat exchanger for chasing, the chasing pipe (15) through which water of the bathtub circulates when chasing the water of the bathtub,
With
The said ejector apparatus supplies the said mixed fluid after having been swirled by the said swirl | flow acceleration part to the said piping for baths, and the piping for reheating, The pipe washing apparatus characterized by the above-mentioned.

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