JP6135465B2 - Ejector device - Google Patents

Description

  The present invention relates to an ejector apparatus that sucks and mixes gas in a liquid flow and flows out a gas-liquid mixed fluid.

  2. Description of the Related Art Conventionally, an ejector device such as a microbubble generator for a water heater disclosed in Patent Document 1 below is known. In this ejector device, gas is sucked into a liquid flow and mixed to flow out a gas-liquid mixed fluid.

Japanese Patent No. 5153376

  The ejector device has a small-diameter mouth portion whose passage cross-sectional area is narrowed in the flow passage through which the liquid flows in order to suck the gas into the liquid flow. The body of the ejector device has a reduced passage in which the passage cross-sectional area gradually decreases toward the downstream side from the small-diameter opening portion, and the passage cross-sectional area decreases toward the downstream side and downstream from the small-diameter opening portion. Has an expanding passage that gradually expands. When such a body is integrally formed with a molding die, for example, a core pin for forming a reduced passage and a core pin for forming an enlarged passage are abutted, and a small-diameter mouth portion is formed at the abutting portion between the tips of the core pins. Is formed.

  If an axial deviation occurs when the ends of the core pins are brought into contact with each other, a preset diameter cannot be secured in the small diameter opening. Therefore, for example, the tip diameter of the core pin that forms the reduction path is made larger than the tip diameter of the core pin that forms the enlarged passage. As a result, the diameter of the small-diameter mouth portion is determined at the tip of the core that forms the enlarged passage, and a stepped surface portion facing the upstream side is formed around the small-diameter mouth portion.

  However, when there is a step surface portion facing the upstream side around the small-diameter mouth portion, there is a problem that the flow rate of the liquid passing through the small-diameter mouth portion is reduced due to the inhibition of the liquid flow by the step surface portion. Specifically, the flow of the liquid flowing through the reduced passage is largely deflected to the center by the step surface portion, and even if the diameter of the small-diameter mouth portion is set to a predetermined diameter, it cannot be used effectively, and the flow rate of the liquid passing through the small-diameter mouth portion is reduced Is generated.

  The present invention has been made in view of the above points, and provides an ejector device capable of preventing a decrease in the flow rate of the liquid passing through the small-diameter mouth portion by suppressing the inhibition of the liquid flow by the stepped surface portion. With the goal.

In order to achieve the above object, in the present invention,
The downstream end of the tapered diameter surface (4021) that forms the reduced passage (402) inward and the radially outer side of the small diameter mouth portion formed around the small diameter mouth portion (402) facing the upstream side of the liquid flow. A cylindrical surface (501, 501A) connecting the outer periphery of the stepped surface portion (502) located in the direction, and the connecting passage (500, 500A) connecting the reduced passage and the small-diameter mouth portion inside the cylindrical surface A connecting passage forming portion (102) formed on the side,
The connecting passage is a passage (500) having a constant passage cross-sectional area in the axial direction, or a passage (500A) whose degree of reduction of the passage cross-section toward the downstream is smaller than that of the reduction passage,
The step surface portion is characterized in that it is positioned outward from a virtual surface (4021A) obtained by extending the reduced diameter tapered surface to the downstream side.

  According to this, the liquid flowing through the flow passage (400) of the body portion (100) flows through the reduction passage and the connection passage in order and flows into the small diameter mouth portion. The liquid flowing in the reduced passage is gradually reduced in the cross-sectional area toward the downstream, so that the flow velocity increases toward the downstream and flows into the connecting passage as a high-speed flow. In the connection passage, the liquid that has become a high-speed flow is likely to flow inside the virtual surface obtained by extending the reduced diameter tapered surface downstream. And the level | step difference surface part formed in the circumference | surroundings of the small diameter opening | mouth part is located outside the virtual surface. Therefore, the liquid flowing in the connection passage hardly collides with the step surface portion. Thereby, the liquid flowing into the small-diameter mouth portion from the reduction passage is not easily deflected by the step surface portion, and can smoothly flow into the small-diameter mouth portion. In this way, inhibition of the liquid flow due to the stepped surface portion can be suppressed, and a decrease in the flow rate of the liquid passing through the small diameter mouth portion can be prevented.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is sectional drawing which shows schematic structure of the ejector apparatus in 1st Embodiment to which this invention is applied. It is sectional drawing which expanded a part of ejector apparatus of 1st Embodiment. It is a figure explaining the flow of the liquid in a part of ejector apparatus shown in FIG. It is a formation process figure for demonstrating the manufacturing method of an ejector apparatus. It is a schematic sectional drawing which shows the state before mold opening about a 1st division | segmentation molded product. It is sectional drawing to which a part of ejector apparatus at the time of a core pin having shifted | deviated the axis | shaft at the time of shaping | molding was expanded. It is a schematic block diagram for demonstrating a piping washing apparatus provided with an ejector apparatus. It is a figure explaining the flow of the liquid in a part of ejector apparatus of a comparative example. It is sectional drawing to which some ejector apparatuses of other embodiment were expanded. It is sectional drawing to which some ejector apparatuses of other embodiment were expanded.

  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. In the case where only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those described previously. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

(First embodiment)
A first embodiment to which the present invention is applied 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 narrowing passage 402, a connection passage 500, 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 inflow portion 401 corresponds to a liquid inlet.

  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 truncated cone-shaped space that is tapered toward the downstream. The connection passage 500 is a passage located on the downstream side of the narrow passage 402, and is a passage in which a constant passage cross-sectional area continues. The small-diameter passage 403 is a passage located on the downstream side of the connection passage 500 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 frustoconical 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 part 42 and the diffuser part 43 exist downstream from the ejection part 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 100 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 100 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 100. 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 44 is connected to an external pipe provided 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 432 of the diffuser portion 43 is connected to an external pipe provided 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 part 41 is provided in the body 100. The suction passage 411 passes through the body 100 so that the gas flows in a direction in which the axial center direction is substantially orthogonal to the axial center direction of the body 100. The external gas sucked through the suction passage 411 is introduced into the passage of the mixing unit 42. 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 containing fine bubbles when flowing through the diffuser unit 43.

  The suction passage 411 is arranged such that its axial direction is twisted with respect to the axial center of the body 100, and introduces external gas into the mixing unit 42 from the tangential direction of the inner peripheral surface of the mixing unit 42. May be. In this case, the introduced gas is sucked into the suction passage 411 by the liquid ejected from the ejection portion 405 of the nozzle portion 40 and mixed while swirling so as to draw an arc along the inner peripheral surface of the mixing portion 42. The passage of the portion 42 flows down in the axial direction.

  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.

  As described above, the ejector device 4 shown in FIG. 1 includes the body 100 in which the liquid flow passage 400 extending from the inflow portion 401 serving as the inflow port to the outflow port 441 is formed. The body 100 has a small-diameter passage 403 that is a small-diameter mouth portion in which the cross-sectional area of the flow passage 400 is most narrowed in the middle of the flow passage 400. The small diameter passage 403 corresponds to a so-called throat portion. The body 100 corresponds to the body portion in the present embodiment. The ejector device 4 sucks the gas from the outside of the body 100 by the suction force of the liquid passing through the small diameter passage 403.

  As shown in FIG. 2, the body 100 includes a reduced passage formation portion 101, a connection passage formation portion 102, and an enlarged passage formation portion 103.

  The reduced passage forming portion 101 has a reduced diameter taper surface 4021 on the inner periphery thereof that is reduced in diameter toward the downstream side on the inflow portion 401 side than the small diameter passage 403. A narrowed passage 402 is formed inside the reduced diameter tapered surface 4021. The narrowed passage 402 is a reduced passage whose passage sectional area gradually decreases toward the downstream.

  The connection passage forming portion 102 has a cylindrical cylindrical surface 501 having the same diameter in the axial direction on the inner periphery thereof. An annular step surface portion 502 facing the liquid flow upstream side (the left side in the drawing) is formed around the small-diameter passage 403, and the cylindrical surface 501 is formed between the downstream end of the reduced diameter tapered surface 4021 and the step surface portion. The outer periphery of 502 is connected. A connection passage 500 that connects the narrow passage 402 and the small diameter passage 403 is formed inside the cylindrical surface 501. Accordingly, the connection passage 500 is a passage having a constant passage cross-sectional area in the axial direction.

  The enlarged passage forming portion 103 has, on its inner periphery, a diameter-expanded tapered surface 4301 that increases in diameter toward the downstream side on the outlet 441 side of the small-diameter passage 403. Further, an enlarged passage 404 and an enlarged passage 430, which are enlarged passages whose passage cross-sectional area gradually increases toward the downstream, are also formed inside the diameter-expanded tapered surface 4301.

  As is clear from FIG. 2, the entire step surface portion 502 provided around the small diameter passage 403 is positioned outward from the virtual surface 4021 </ b> A obtained by extending the reduced diameter tapered surface 4021 downstream. .

  The body 100, which is a cylindrical body that is open at both ends, can be configured to include a plurality of parts. For example, the body 100 can be configured to include at least three parts. Here, as shown in FIG. 1, the body 100 is assumed to be composed of three parts divided in the axial direction. The three parts are a first divided molded article 47, a second divided molded article 48, and a third divided molded article 49 that are arranged in order toward the downstream side of the ejector device 4.

  The first divided molded product 47 is a part that forms a fluid passage from the inflow portion 401 to immediately before the start point of the ridge 45. In the first divided molded product 47, the swirl flow promoting portion is not provided on the inner peripheral surface forming the fluid passage from the inflow portion 401 to the downstream end surface 471. Accordingly, in the first divided molded article 47, the small-diameter passage 403 is a portion having the smallest passage cross-sectional area, and the fluid extending through the expanding passage 404 to the most downstream portion where the protruding portion 45 is not provided in the enlarged passage 430. Form a passage.

  The second divided molded article 48 is a part that forms a fluid passage extending from the upstream end surface 481 to the downstream end surface 482. In the second divided molded article 48, a swirl flow promoting portion is provided from the upstream end surface 481 to the downstream end surface 482 over the entire inner peripheral surface forming the fluid passage. Therefore, the second divided molded article 48 forms a fluid passage that extends from the upstream start point of the ridge 45 to the downstream end of the diffuser 43 in the middle of the enlarged passage 430. In this way, the second divided molded article 48 is a passage whose passage cross-sectional area increases toward the downstream, and forms a passage in which the ridges 45 are present in the entire passage.

  The third divided molded product 49 is a part that forms a fluid passage that extends from the upstream end surface 491 to the outlet 441 that is the downstream end. The fluid passage formed by the third divided molded product 49 is provided with a swirl flow promoting portion over the entire inner peripheral surface thereof. Therefore, the third divided molded product 49 constitutes the cylindrical body portion 44. As described above, the third divided molded product 49 forms a passage having a constant passage cross-sectional area in which the protruding strip portion 46 is formed on the inner peripheral surface 440.

  Each of these divided molded products can be manufactured by injection molding using a mold. Further, the ejector device 4 can be manufactured by fitting three divided molded products arranged in the axial direction and integrally joining them by bonding, welding, bonding using a fixture, or the like. Accordingly, the first divided molded product 47 and the second divided molded product 48 are integrated by joining the downstream end surface 471 and the upstream end surface 481, and the second divided molded product 48 and the third divided molded product 48 are combined. 49 is integrated by joining the downstream end surface 482 and the upstream end surface 491 together. Each divided molded product can be formed of the same material. Each divided molded article can be formed of, for example, a hard resin material having durability against fluid pressure.

  Next, with reference to FIGS. 4 and 5, the manufacture of each divided molded product and the manufacture of the ejector device 4 will be described. FIG. 4 is a flowchart showing the flow of an injection molding process related to the production of each divided molded product.

  As shown in FIG. 4, the injection molding is a process of setting an appropriate molding material free of foreign substances, a plasticizing process, an injection process, a pressure holding process, a cooling and solidifying process, a mold opening process, a molded product taking process, and a mold clamping. It is performed in the order of steps. The molding machine melts the resin material (plasticization process), injects it into the mold (injection process), and applies pressure so as to maintain an appropriate density up to a predetermined temperature (pressure holding process). The mold cools the mold and hardens the resin material into a predetermined shape (cooling and solidifying step).

  When the molded product is cooled to a temperature at which it can be taken out, the mold is opened (mold opening step), and the molded product is released and taken out by the mold protruding function (takeout step). After the molded product is taken out, the mold is again clamped to a predetermined clamping force (a clamping process). After the mold closing process, the process returns to the injection process and each process is repeated. In addition, after the pressure holding process, the molding machine shifts again to the next plasticizing process and is cooled by a mold (cooling and solidifying process). Moreover, each process is implemented automatically and continuously in cooperation.

  In order to manufacture the body 100 of the ejector device 4, molds corresponding to the first divided molded product 47, the second divided molded product 48, and the third divided molded product 49 are used. That is, the body 100 of the ejector device 4 can be manufactured by assembling and integrating three divided molded products, each molded using three molds.

  With respect to each divided molded product, a mold opening process and an extraction process performed after the cooling and solidifying process will be described. As for the first divided molded product 47, as shown in FIG. 5, the outer shape of the molded product is formed by the first outer mold 70 and the second outer mold 80, and the first inner mold 91 and the second outer mold 80. The inner peripheral shape of the molded product is formed by the inner die 92. Further, the suction passage 411 of the suction part 41 is formed by a pin-shaped mold 90.

  Each of the first outer mold 70 and the second outer mold 80 is, for example, a semi-cylindrical mold, and has a structure in which the first outer mold 70 and the second outer mold 80 are combined or separated in a direction crossing the fluid passage (the vertical direction in FIG. 5). It is. Each of the first inner mold 91 and the second inner mold 92 is, for example, a frustoconical mold, and has a structure in which the first inner mold 91 and the second inner mold 92 are combined with or separated from each other in the axial direction of the fluid passage (lateral direction in FIG. 5). is there. The first inner die 91 has a columnar portion corresponding to the connection passage 500 at the tip portion (right end portion in the drawing) having a truncated cone shape.

  The first inner die 91 and the second inner die 92 are so-called core pins. The first inner mold 91 is a mold that forms a narrow passage 402 and a connection passage 500 from the inflow portion 401 to the small diameter passage 403 inside the first divided molded product 47. The second inner mold 92 is a mold that forms, on the inner side of the first divided molded article 47, an expanded path 404 and an expanded path 430 in a portion without the protruding strip 45 from the small diameter path 403 to the downstream end surface 471. It is. The first inner mold 91 and the second inner mold 92 are installed so that the distal ends thereof are abutted in the axial direction at the position where the small diameter passage 403 is formed and occupy the fluid passage of the first divided molded article 47. .

  The first outer mold 70, the second outer mold 80, the pin-shaped mold 90, the first inner mold 91, and the second inner mold 92 are provided with a swirl flow promoting portion in the body 100 of the ejector device 4. This constitutes a first mold that is used to mold the missing part.

  Each of these dies is positioned relative to each other by guide pins or interlock pins. When the molten resin flows into the cavity between the molds installed at a predetermined position through a flow path such as a gate at a predetermined speed and further undergoes a pressure holding step, the first divided molding shown in the sectional view of FIG. Article 47 is formed. In the mold opening process, first, the pin-shaped mold 90 is pulled out in the axial direction of the suction passage 411. Further, each of the first inner mold 91 and the second inner mold 92 is pulled out in the axial direction of the fluid passage (the arrow direction in FIG. 5). Finally, either the first outer mold 70 or the second outer mold 80 is taken out in the direction crossing the fluid passage (the vertical direction in FIG. 5). Then, the first divided molded product 47 is pushed out by the ejecting pin, so that the first divided molded product 47 drops out of the remaining mold and is taken out.

  Although the illustration of the second divided molded product 48 and the third divided molded product 49 is omitted, the outer shape of the molded product is formed by the first outer mold and the second outer mold, and the inner mold is used. Thus, the inner peripheral shape of the molded product is formed.

  Each of the first outer mold and the second outer mold is, for example, a semi-cylindrical mold, and has a structure in which the first outer mold and the second outer mold are combined or separated in a direction crossing the fluid passage. The inner mold is, for example, a frustoconical mold in the second divided molded article 48, and is, for example, a cylindrical mold in the third divided molded article 49, and can be moved in the axial direction of the fluid passage. It is a structure.

  The inner mold includes a spiral groove on the outer peripheral surface for forming the ridge. The molten resin flows into the spiral groove and is cooled and solidified to form spiral ridges protruding from the inner peripheral surfaces of the second divided molded product 48 and the third divided molded product 49. be able to. Therefore, the inner mold is a mold that forms a swirl flow promoting portion on the inner peripheral surfaces of the second divided molded product 48 and the third divided molded product 49. The inner mold is installed so as to occupy the fluid passages of the second divided molded article 48 and the third divided molded article 49.

  The second divided molded product 48 and the third divided molded product 49 are molded in substantially the same manner as the first divided molded product. However, in the mold opening process, first, the inner mold is pulled in the axial direction of the fluid passage by rotating the inner mold in the same direction as the rotation direction in which the groove portion advances. Finally, either the first outer mold or the second outer mold is taken out in a direction crossing the fluid passage. Then, the second and third divided molded products 48 and 49 are pushed out by the ejecting pins, so that they drop out from the remaining mold and are taken out.

  The swirling flow promoting portion is not provided on the inner peripheral surface of the upstream portion of the nozzle portion 40 and the diffuser portion 43, but the swirling flow promoting portion is provided on the inner peripheral surface of the downstream portion from the middle position of the diffuser portion 43. Is provided. When both these parts are manufactured as a single molded product by integral molding, there is a problem that it is difficult to perform die cutting.

  Therefore, as described above, the first divided molded product 47 that does not have the convex strips on the inner side and the second split molded product 48 that has the convex strips 45 on the inner side are separate parts, and each of them is an individual component. Manufacture with mold and combine both parts into one. According to this manufacturing method, the ejector device 4 solves the difficulty of die-cutting for a resin molded product including an inner undercut shape such as a spiral ridge 45 or a groove starting from the middle of the enlarged passage 430. Can be manufactured.

  Further, the diffuser portion 43 and the cylindrical body portion 44 are both provided with the swirl flow promoting portion, but the fluid passages formed by the both have different shapes, and the swirl flow has an inner undercut shape. A promotion section is provided. When both these parts are manufactured as a single molded product by integral molding, there is a problem that it is difficult to perform die cutting.

  Therefore, as described above, the second divided molded product 48 having the ridges 45 in the enlarged passage 430 and the third divided molded product 49 having the ridges 46 in the straight passage having a constant cross-sectional area are separated from each other. As parts, each is manufactured with a separate mold, and both parts are combined and integrated. According to this manufacturing method, it is possible to manufacture the ejector device 4 by solving the difficulty of die-cutting for resin molded products including inner undercuts such as spiral ridges and grooves provided in differently shaped passages. Can do.

  Here, bubbles generated in the expansion passage 430 of the diffuser portion 43 will be described. In the ejector device 4, a negative pressure portion is generated in the passage by the venturi effect due to the pressure fluctuation caused by the liquid flow velocity difference in the nozzle portion 40. 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 with which this effect was acquired can be stirred by formation of a swirl flow, according to the ejector apparatus 4, the gas-liquid mixed fluid which has the air bubble fully refined | miniaturized can be produced | generated.

  When the liquid flows through the flow passage 400 in the body 100, the liquid flows in the nozzle portion 40 as illustrated by arrows in FIG. The flow rate of the liquid flowing in the narrowed passage 402 is gradually reduced toward the downstream, so that the flow velocity increases toward the downstream. Most of the high-speed liquid flowing into the connection passage 500 from the narrowing passage 402 flows down the inside of the virtual plane 4021A illustrated in FIG. 2 and passes through the small diameter passage 403 in the connection passage 500. The liquid flowing from the connection passage 500 into the small diameter passage 403 forms a flow directed by the narrow passage 402, flows so as to jump over the step surface portion 502, and flows into the small diameter passage 403. The liquid that has passed through the small diameter passage 403 flows down the expanding passage 404 and the expanding passage 430 while reducing the flow velocity.

  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. 7, an example of an apparatus for cleaning piping connected to the bathtub 50 will be described.

  As shown in FIG. 7, the hot water supply apparatus 1000 includes a pipe cleaning apparatus including the ejector apparatus 4. The hot water supply apparatus 1000 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, and is a metal container having excellent corrosion resistance, such as a stainless steel container. A heat insulating material is installed on the outer periphery, and the hot water for hot water supply can be used for a long time. Can be kept warm across.

  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 16 of the reheating pipe 150 that forms the bathtub water circuit, and communicates with the adapter 51 of the bathtub 50 via the forward pipe 15 and the return pipe 16. Here, the forward piping 15 is a piping that connects the outlet portion of the bathtub water-side passage 17 a of the reheating heat exchanger 17 and the bathtub 50. The return pipe 16 is a pipe that connects the bathtub 50 and the inlet of the bathtub water side passage 17a of the reheating heat exchanger 17. The end of the return pipe 16 on the bathtub 50 side is an inflow end 154 into which bathtub water flows when the bathtub water circulates in the bathtub water circuit.

  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.

  In the hot water supply apparatus 1000, the ejector apparatus 4 is configured 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. So that it is installed.

  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 micro bubble toward the inside of the piping by the side of the bathtub 50, or the inside of the return piping 16 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 outgoing pipe 15, the bathtub water-side passage 17 a of the reheating heat exchanger 17, the return 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 bathtub water circulating in the bathtub water circuit in the reheating pipe 150 from flowing backward to the bath mixing valve 25 side. A circulation temperature thermistor (not shown) is provided in the return 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 outgoing 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 1000 includes a reheating heat exchanger 17 installed 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.

  The bathtub water circuit that circulates the bathtub water includes a forward pipe 15 and a return pipe 16, and a bathtub water-side passage 17 a of the reheating heat exchanger 17. The bathtub water circuit is formed in the reheating pipe 150, and the bath pipe 14 is connected to the reheating pipe 150 at the connection point 153.

  The tracking pipe 150 includes a first pipe 151 and a second pipe 152. The first pipe 151 and the second pipe 152 are connected to each other at a connection point 153. In this example, the first pipe 151 is composed of a portion closer to the heat exchanger 17 for reheating than the connection point 153 of the return pipe 16 and the forward pipe 15, and the second pipe 152 is connected to the connection point 153 of the return pipe 16. The tub 50 side portion is also included. The reheating heat exchanger 17 is provided in the first pipe 151, and the water level sensor 29 and the bath circulation pump 19 are provided in the second pipe 152.

  According to the ejector device 4 configured as described above, the body 100 includes a stepped surface portion 502 formed around the small-diameter passage 403 facing the upstream side of the liquid flow, and a downstream end of the reduced-diameter tapered surface 4021 that forms the narrowing passage 402. And a cylindrical surface 501 that connects the outer periphery of the stepped surface portion 502. A connection passage 500 that connects the narrow passage 402 and the small-diameter passage 403 is formed inward of the cylindrical surface 501 and has a constant passage cross-sectional area in the axial direction. The step surface portion 502 is positioned outward from the virtual surface 4021A obtained by extending the reduced diameter tapered surface 4021 to the downstream side.

  According to this, the liquid flowing through the flow passage 400 of the body 100 flows through the narrow passage 402 and the connection passage 500 in order and flows into the small diameter passage 403. The liquid flowing in the narrowed passage 402 gradually decreases in the cross-sectional area toward the downstream, so that the flow velocity increases toward the downstream and flows into the connection passage 500 as a high-speed flow. In the connection passage 500, the liquid that has become a high-speed flow tends to flow inside the virtual surface 4021A obtained by extending the reduced diameter tapered surface 4021 to the downstream side. The step surface portion 502 formed around the small-diameter passage 403 is located outside the virtual surface 4021A. Therefore, the liquid flowing in the connection passage 500 does not easily collide with the stepped surface portion 502. As a result, the liquid flowing from the narrowed passage 402 into the small diameter passage 403 is not easily deflected by the stepped surface portion 502 and smoothly flows into the small diameter passage 403. In this way, inhibition of the liquid flow caused by the stepped surface portion 502 can be suppressed, and a decrease in the flow rate of the liquid passing through the small diameter passage 403 can be prevented.

  Further, the entire step surface portion 502 is positioned outward from the virtual surface 4021A. According to this, the liquid flowing in the connection passage 500 is extremely difficult to collide with the stepped surface portion 502. As a result, the liquid flowing from the narrowed passage 402 into the small diameter passage 403 is less likely to be deflected by the step surface portion 502 and can flow into the small diameter passage 403 more smoothly. In this way, it is possible to reliably prevent the liquid flow from being obstructed by the stepped surface portion 502, and to reliably prevent a decrease in the flow rate of the liquid passing through the small diameter passage 403.

  As in the comparative example shown in FIG. 8, when no connection passage is provided between the narrow passage 402 and the small diameter passage 403, a part of the liquid flowing through the narrow passage 402 collides with the step surface portion 502. The liquid that has collided with the stepped surface portion 502 is deflected inward, and when flowing into the small-diameter passage 403, the liquid flow is reduced more than the diameter of the small-diameter passage 403. By such a flow, even if the small diameter passage 403 has a predetermined diameter, the whole cannot be used effectively, and the flow rate of the liquid passing through the small diameter passage 403 decreases. According to the ejector device 4 of the present embodiment, the above-described problems can be prevented, and the diameter of the small diameter passage 403 can be used effectively.

  The stepped surface portion 502 has a passage cross-sectional area of the small-diameter passage 403 even if an axial deviation occurs when the tip portions of the first inner die 91 and the second inner die 92 shown in FIG. It is provided to ensure. Therefore, as shown in FIG. 6, for example, it is preferable to provide the connection passage 500 so that the stepped surface portion 502 is located outside the virtual surface 4021A even when the maximum axis deviation occurs.

  In the ejector device 4 of the present embodiment, the connection passage 500 is a passage having a constant passage cross-sectional area in the axial direction. According to this, the axial direction length of the connection passage 500 can be made relatively short. Therefore, it is easy to suppress the liquid flow from leaking outside the virtual surface 4021A in the connection passage 500. Thereby, inhibition of the liquid flow caused by the stepped surface portion 502 can be more reliably suppressed, and a decrease in the flow rate of the liquid passing through the small diameter passage 403 can be more reliably prevented.

  Further, the ejector device 4 includes a nozzle part 40 for decompressing the liquid, a suction part 41 for sucking the gas, a mixing part 42 for forming a passage for mixing the liquid from the nozzle part 40 and the sucked gas, And a diffuser portion 43 that forms an enlarged passage 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, the gas can be sufficiently sucked by the mixing portion 42, and the gas-liquid mixed fluid in a good state is reduced in flow rate due to the pressure increase of the diffuser portion 43. It is possible to stir by forming a swirl flow while suppressing the above. 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 piping 150 for reheating that connects the two. 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 150.

  According to this, the bath pipe 14 and the reheating pipe 150 are washed by the jet flow from the ejector device 4 that exhibits the above-described effect, so that the bath water is repeatedly flown into the pipe by the recirculation operation or the like. The accumulated dirt can be cleaned.

(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 embodiment, the connection passage connecting the narrow passage 402 and the small diameter passage 403 is the straight connection passage 500 having a constant passage cross-sectional area in the axial direction, but is not limited thereto. For example, as shown in FIG. 9, the inner peripheral surface of the connection passage forming portion 102 is a tapered cylindrical surface 501 </ b> A that connects the downstream end of the reduced diameter tapered surface 4021 and the outer periphery of the stepped surface portion 502. Then, the narrowing passage 402 and the small diameter passage 403 may be connected by a connection passage 500A formed inside the cylindrical surface 501A. The connection passage 500 </ b> A is a passage that is smaller than the passage 402 because the degree of reduction of the passage cross-sectional area is narrowed toward the downstream.

  According to this, the liquid flowing through the flow passage 400 of the body 100 flows through the narrow passage 402 and the connection passage 500A in order and flows into the small diameter passage 403. The liquid flowing in the narrowed passage 402 gradually decreases in the cross-sectional area as it goes downstream, so that the flow velocity increases toward the downstream and flows into the connecting passage 500A as a high-speed flow. In the connection passage 500A, the liquid that has become a high-speed flow tends to flow inside the virtual surface 4021A obtained by extending the reduced diameter tapered surface 4021 to the downstream side. The step surface portion 502 formed around the small-diameter passage 403 is located outside the virtual surface 4021A. Therefore, the liquid flowing in the connection passage 500 </ b> A hardly collides with the step surface portion 502. As a result, the liquid flowing from the narrowed passage 402 into the small diameter passage 403 is not easily deflected by the stepped surface portion 502 and smoothly flows into the small diameter passage 403. In this way, inhibition of the liquid flow caused by the stepped surface portion 502 can be suppressed, and a decrease in the flow rate of the liquid passing through the small diameter passage 403 can be prevented. Also in the configuration illustrated in FIG. 9, it is preferable that the entire step surface portion 502 is positioned outward from the virtual surface 4021A.

  Moreover, in the said embodiment, although the expansion channel | path 404 and the expansion channel | path 430 were provided as an expansion channel which a channel cross-sectional area gradually expands immediately after the small diameter channel | path 403 as it goes downstream, it is not limited to this. . For example, as shown in FIG. 10, a part or all of the expansion passage 404 of the above embodiment may be a straight passage 404 </ b> A having the same diameter as that of the small diameter passage 403.

  That is, a straight passage 404A having the same cross-sectional area as the small-diameter passage 403 is provided between the small-diameter passage 403 and an enlarged passage whose passage cross-sectional area gradually increases toward the downstream side of the small-diameter passage 403. Also good. According to this, even if the small diameter passage 403 is worn and expanded in diameter due to the liquid flow, for example, the straight passage 404A can narrow the flow passage 400 in the same manner as the small diameter passage 403 before wear.

  Moreover, in the said embodiment, although the whole surface of the level | step difference surface part 502 was located rather than the virtual surface 4021A, it is not limited to this. For example, a part of the step surface portion 502 may be located inward of the virtual surface 4021A. Further, the stepped surface portion 502 may include burrs that may be formed during molding.

  Moreover, in the said embodiment, although a turning flow promotion part is comprised by the protruding item | line part 45 and the protruding item | line part 46 of the shape which protrudes from the internal peripheral surface which forms a channel | path, and extends spirally, it is not limited to this form. 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 described above may have a form that extends spirally without being interrupted in the middle, or a swirl flow promoting portion that is interrupted in the middle and includes a plurality of portions. The form which comprises may be sufficient. In short, the shape of the swirling flow promoting portion is limited to that described in the above embodiment as long as the mixed fluid can be circulated as a swirling flow in each of the passages of the diffuser portion 43 and the cylindrical body portion 44. Not.

  Moreover, 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. May be defined as

  Moreover, in the said embodiment, although the ejector apparatus was provided with the turning flow promotion part, it is not limited to this. It does not matter even if it does not have a swirl flow promoting part such as a ridge part.

  Moreover, in the said embodiment, although the body 100 of the ejector apparatus 4 was divided and formed in the axial direction, it is not limited to this. For example, the body may be formed in a divided form different from the above embodiment. For example, the body may be integrally formed.

  Moreover, in the said embodiment, although the part provided with the narrowing path | pass 402 which is a reduction | decrease passage and the part provided with the expansion passage | path 404 and the expansion passage | path 430 which are expansion passages were integrally molded, it is limited to this. is not. For example, a portion upstream of the small diameter passage 403 and a portion downstream of the small diameter passage 403 may be formed as separate bodies and joined to each other. In order to ensure the cross-sectional area of the small-diameter passage 403 even when an axial deviation occurs between the axis of the passage upstream of the small-diameter passage 403 and the axis of the passage downstream of the small-diameter passage 403 at the time of joining. Providing the stepped surface portion 502 is effective. Even in such a case, if a connection passage is provided by applying the present invention, a great effect can be obtained.

4 Ejector device 100 Body (Body part)
400 Flow path 402 Narrow path (reduction path)
403 Small diameter passage (small diameter opening)
404 Expansion passage (part of expansion passage)
430 Expansion passage (part of expansion passage)
500, 500A Connection passage 501, 501A Tubular surface 502 Stepped surface portion 4021 Reduced diameter tapered surface 4021A Virtual surface 4301 Expanded tapered surface

Claims (3)

A liquid flow passage (400) extending from the inflow port (401) to the outflow port (441) is formed inside, and a small-diameter mouth portion (403) in which the cross-sectional area of the flow passage is most narrowed in the middle of the flow passage. A body portion (100) having
An ejector device that sucks a gas from the outside by a suction force of the liquid passing through the small-diameter opening,
The body part is
A reduced diameter passage (402) having a diameter-reduced taper surface (4021) that is reduced in diameter toward the downstream side of the inflow port with respect to the small-diameter opening portion, and whose passage cross-sectional area gradually decreases toward the downstream side. A reduced passage forming portion (101) formed inward of the tapered surface;
The enlarged passages (404, 430) have a diameter-expanded tapered surface (4301) that increases in diameter toward the downstream side of the outlet port from the small-diameter opening, and the passage cross-sectional area gradually increases toward the downstream side. An enlarged passage forming portion (103) formed inward of the enlarged diameter tapered surface;
A stepped surface portion (502) that is formed around the small-diameter mouth portion and faces the upstream side of the liquid flow , and is located radially outward of the small-diameter mouth portion ;
It has a cylindrical surface (501, 501A) connecting the downstream end of the reduced diameter tapered surface and the outer periphery of the stepped surface portion, and the connection passage (500, 500A) connecting the reduced passage and the small diameter mouth portion is the A connection passage forming portion (102) formed inside the cylindrical surface,
The connecting passage is a passage (500) having a constant passage cross-sectional area in the axial direction, or a passage (500A) whose degree of reduction of the passage cross-section toward the downstream is smaller than that of the reduction passage,
The ejector apparatus according to claim 1, wherein the stepped surface portion is positioned outward from a virtual surface (4021A) obtained by extending the reduced diameter tapered surface downstream.   2. The ejector device according to claim 1, wherein the stepped surface portion has an entire region positioned outward from the virtual surface.   The ejector device according to claim 1, wherein the connection passage is a passage having a constant passage cross-sectional area in the axial direction.

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