WO2017169219A1 - エゼクタ、エゼクタの製造方法及びディフューザの出口流路の設定方法 - Google Patents
エゼクタ、エゼクタの製造方法及びディフューザの出口流路の設定方法 Download PDFInfo
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- WO2017169219A1 WO2017169219A1 PCT/JP2017/005469 JP2017005469W WO2017169219A1 WO 2017169219 A1 WO2017169219 A1 WO 2017169219A1 JP 2017005469 W JP2017005469 W JP 2017005469W WO 2017169219 A1 WO2017169219 A1 WO 2017169219A1
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- WIPO (PCT)
- Prior art keywords
- flow path
- channel
- ejector
- diffuser
- attachment
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/18—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for compressing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/461—Adjustable nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/469—Arrangements of nozzles for steam engines
Definitions
- the technology disclosed herein includes an ejector that sucks and discharges the second fluid together with the first fluid by the negative pressure generated when the first fluid is ejected, and an outlet flow path of a diffuser used in the ejector. It relates to the setting method.
- Patent Document 1 discloses a general ejector.
- the first fluid driving fluid
- the second fluid driven fluid
- the first fluid and the second fluid are mixed and discharged from the diffuser (exit).
- the diffuser is provided with an enlarged channel (a channel whose channel cross-sectional area increases as it goes downstream), and the mixed fluid of the first fluid and the second fluid is decelerated and pressurized when flowing through the enlarged channel. .
- the mixed fluid discharged from the ejector is supplied to a device or the like on the downstream side of the ejector.
- the discharge pressure may fluctuate due to, for example, a change in operating conditions (amount of mixed fluid used or a pressure used) of a steam supply destination device. For example, when the amount of the mixed fluid in the supply destination apparatus is temporarily decreased or the operating pressure is temporarily increased, the discharge flow rate of the ejector is decreased and the discharge pressure is increased. If the discharge pressure becomes too high, the second fluid becomes difficult to be sucked, and eventually the suction flow rate of the second fluid is significantly reduced. In such a case, an ejector that can secure a sufficient suction flow rate of the second fluid up to the highest possible discharge pressure is desired.
- Ejector performance such as the discharge pressure of the mixed fluid and the suction flow rate of the second fluid varies depending on the specifications of the diffuser flow path, that is, the dimensions.
- the dimensions that is, the dimensions.
- changing the size of the diffuser flow path may deteriorate the performance of the ejector.
- the technology disclosed herein has been made in view of such circumstances, and its purpose is to change the upper limit of the discharge pressure at which the suction flow rate of the second fluid can be ensured, while reducing the performance of the ejector at that time. It is to reduce.
- the ejector disclosed herein includes a nozzle that ejects a first fluid, a suction chamber in which the nozzle is accommodated, and a second fluid is sucked by a negative pressure generated by ejecting the first fluid from the nozzle, A diffuser that mixes and discharges the first fluid and the second fluid in the suction chamber, and the outlet channel has a first tapered surface that narrows toward the downstream side.
- a reduced flow channel a parallel flow channel connected to the downstream end of the reduced flow channel and having a constant cross-sectional area, and a second tapered surface connected to the downstream end of the parallel flow channel and becoming thicker toward the downstream side
- the diffuser further includes a changing unit that changes the size of the outlet channel, and the changing unit has a smaller cross-sectional area of the parallel channel.
- the first tapered surface with respect to the taper angle The ratio of the taper angle to change the dimensions of the outlet channel so as to increase.
- the ejector manufacturing method disclosed herein includes a setting step for setting the dimension of the outlet channel, and a preparation step for preparing the diffuser having the dimension of the outlet channel set in the setting step.
- the dimension of the outlet channel is set so that the ratio of the taper angle of the first taper surface to the taper angle of the second taper surface increases as the cross-sectional area of the parallel channel decreases. .
- the method for setting the outlet flow path of the diffuser disclosed herein includes the step of setting a cross-sectional area of the parallel flow path, and the smaller the cross-sectional area of the parallel flow path, the taper angle of the second tapered surface is Setting the dimension of the outlet flow path so that the ratio of the taper angle of the first taper surface is increased.
- the ejector it is possible to reduce the deterioration of the ejector performance at that time while changing the upper limit of the discharge pressure that can secure the suction flow rate of the second fluid.
- the ejector manufacturing method it is possible to provide an ejector that reduces the deterioration of the ejector performance at that time while changing the upper limit of the discharge pressure that can secure the suction flow rate of the second fluid.
- the setting method of the outlet flow path of the diffuser it is possible to realize an ejector that reduces the deterioration of the ejector performance at that time while changing the upper limit of the discharge pressure that can secure the suction flow rate of the second fluid.
- FIG. 1 is a diagram schematically illustrating a configuration of an ejector according to the embodiment.
- FIG. 2 is a graph showing the relationship between the discharge pressure and the suction flow rate.
- FIG. 3 is a schematic cross-sectional view of the diffuser to which the first attachment is attached.
- FIG. 4 is a schematic cross-sectional view of the diffuser to which the second attachment is attached.
- the ejector 10 is a steam ejector that sucks low-pressure steam (second fluid) by ejecting high-pressure steam (first fluid), and mixes and discharges these steam. That is, in the ejector 10, the high-pressure steam is the driving fluid, and the low-pressure steam is the suction fluid.
- the ejector 10 includes a nozzle 20, a suction chamber 30, and a diffuser 40.
- the nozzle 20 is connected to an inflow pipe 91 connected to a supply source of high-pressure steam.
- the nozzle 20 ejects the supplied high-pressure steam.
- the tip of the nozzle 20 is accommodated in the suction chamber 30.
- the suction chamber 30 is provided with a suction port 31 for low-pressure steam.
- the low pressure steam is sucked from the suction port 31 into the suction chamber 30 by the negative pressure (pressure drop) generated when the high pressure steam is ejected from the nozzle 20. That is, in the suction chamber 30, a suction force for sucking the low-pressure steam is generated by the negative pressure generated by the jet pump effect of the high-pressure steam.
- the suction port 31 is connected to a suction pipe 92 connected to the supply source of the low-pressure steam.
- the diffuser 40 is connected to the suction chamber 30.
- the diffuser 40 mixes and discharges the high-pressure steam ejected into the suction chamber 30 and the low-pressure steam sucked into the suction chamber 30.
- An outflow pipe 93 connected to the supply destination of the mixed steam is connected to the downstream end of the diffuser 40.
- the diffuser 40 has a divided structure including an upstream portion 41, an attachment 42 and a downstream portion 43.
- the upstream end of the upstream portion 41 is connected to the suction chamber 30.
- a flange 41 a is provided at the downstream end of the upstream portion 41.
- a first flange 43 a is provided at the upstream end of the downstream portion 43, and a second flange 43 b is provided at the downstream end of the downstream portion 43.
- the downstream part 43 is connected to the outflow pipe 93 via the second flange 43b.
- the attachment 42 is sandwiched between the upstream portion 41 and the downstream portion 43.
- the attachment 42 is held by the upstream portion 41 and the downstream portion 43 by tightening the flange 41 a of the upstream portion 41 and the first flange 43 a of the downstream portion 43 with a bolt 44. That is, the attachment 42 can be replaced by loosening the fastening of the bolt 44.
- the attachment 42 is an example of a changing unit.
- the diffuser 40 is formed with an outlet channel 50 for high-pressure steam and low-pressure steam that communicates with the suction chamber 30.
- the outlet channel 50 includes a reduced channel 51, a parallel channel 52, and an enlarged channel 53 that are sequentially connected from the upstream side.
- the cross section of the outlet channel 50 is substantially circular. The diffuser 40 decelerates and pressurizes the mixed steam when the mixed steam flows through the enlarged flow path 53.
- the upstream end of the reduced flow path 51 is open to the suction chamber 30.
- the upstream end of the reduced flow path 51 faces the downstream end of the nozzle 20 in the suction chamber 30.
- the cross-sectional area, that is, the inner diameter of the reduced flow channel 51 gradually decreases toward the downstream side. That is, the reduced flow path 51 has a first tapered surface 54 that becomes narrower toward the downstream side.
- a parallel flow path 52 is connected to the downstream end of the reduction flow path 51.
- the parallel flow path 52 is a flow path having a constant cross-sectional area, that is, an inner diameter.
- the parallel flow path 52 is a portion having the smallest inner diameter in the outlet flow path 50 and constitutes a so-called throat portion.
- An enlarged channel 53 is connected to the downstream end of the parallel channel 52.
- the cross-sectional area of the enlarged flow path 53 that is, the inner diameter gradually increases toward the downstream side. That is, the enlarged flow path 53 has a second tapered surface 55 that becomes thicker toward the
- the reduced flow path 51 is formed from the upstream portion 41 to the attachment 42.
- the parallel flow path 52 is formed in the attachment 42.
- the enlarged flow path 53 is formed from the attachment 42 to the downstream portion 43. That is, at least the upstream end portion of the reduced flow channel 51 is formed in the upstream portion 41.
- the attachment 42 is formed with at least the downstream end of the reduced flow channel 51, the parallel flow channel 52, and at least the upstream end of the enlarged flow channel 53. At the downstream portion 43, at least the downstream end portion of the enlarged flow path 53 is formed.
- the high-pressure steam flowing through the inflow pipe 91 is ejected from the nozzle 20 into the suction chamber 30, and the low-pressure steam is ejected from the suction port 31 into the suction chamber 30 by the ejection of the high-pressure steam. Sucked.
- the high pressure steam and low pressure steam in the suction chamber 30 are mixed and discharged from the diffuser 40.
- the steam discharged from the diffuser 40 is supplied to the downstream apparatus.
- the flow velocity of the mixed steam is approximately the speed of sound in the parallel flow path 52 of the diffuser 40. Thereafter, the mixed steam is decelerated and pressurized when flowing through the enlarged flow path 53.
- the discharge pressure of the ejector 10 may increase depending on the operating conditions and specifications of the steam supply destination device.
- this discharge pressure is referred to as “maximum discharge pressure” that can secure the suction flow rate of the low-pressure steam.
- Pmax the maximum discharge pressure
- the suction pressure starts to rise.
- the flow velocity in the parallel flow path 52 becomes lower than the sound velocity and becomes a non-critical state, and the suction pressure rises to a value almost equal to the discharge pressure. That is, when the discharge pressure exceeds the maximum discharge pressure Pmax, the suction flow rate of the low-pressure steam decreases rapidly.
- the maximum discharge pressure Pmax can be changed according to the specifications of the outlet channel 50, that is, the dimensions.
- the diffuser 40 is configured such that the dimensions of the outlet channel 50 can be changed by replacing the attachment 42.
- changing only the inner diameter D of the parallel flow path 52 may not only increase the maximum discharge pressure Pmax but also may not maintain the performance of the ejector 10. For example, even if the maximum discharge pressure Pmax can be increased, the suction flow rate of low-pressure steam may be significantly reduced, or conversely, the maximum discharge pressure Pmax may be reduced. That is, various dimensions of the outlet channel 50 are related to the performance of the ejector 1, and it is necessary to change dimensions other than the inner diameter D of the parallel channel 52.
- the dimension of the outlet channel 50 is set so that ⁇ / ⁇ is increased.
- the inner diameter D of the parallel flow path 52 is set smaller as the target maximum discharge pressure is higher.
- the taper angles ⁇ and ⁇ are set so that the taper angle ratio ⁇ / ⁇ increases as the inner diameter D decreases.
- the taper angle ⁇ of the portion of the first taper surface 54 formed on the attachment 42 and the taper angle ⁇ of the portion of the second taper surface 55 formed on the attachment 42 are changed.
- taper angle ⁇ and “taper angle ⁇ ” mean the taper angle of the taper surface of the portion formed on the attachment 42.
- the taper angle ⁇ of the first taper surface 54 is changed so as to increase as the inner diameter D decreases.
- the taper angles ⁇ and ⁇ are set so that the taper angle ratio ⁇ / ⁇ increases as the inner diameter D decreases. That is, when it is necessary to increase at least one of the taper angles ⁇ and ⁇ as the inner diameter D decreases, the taper angle ⁇ is increased more greatly to suppress the increase in the taper angle ⁇ .
- the taper angle is larger than the enlargement ratio of the taper angle ⁇ (that is, the taper angle ⁇ after change / taper angle ⁇ before change).
- the taper angles ⁇ and ⁇ are set such that the enlargement ratio of ⁇ (that is, the taper angle ⁇ after change / taper angle ⁇ before change) is larger.
- the taper angle ⁇ of the first taper surface 54 and the taper angle ⁇ of the second taper surface 55 can affect the turbulence of the mixed steam flow. When these angles increase, separation may occur and the flow may be disturbed. When the flow turbulence increases, the performance of the ejector 10 deteriorates.
- the taper angle ⁇ of the enlarged flow channel 53 has a greater influence on the flow disturbance than the taper angle ⁇ of the reduced flow channel 51.
- the taper angle ⁇ is changed more greatly to suppress the increase in the taper angle ⁇ . Therefore, the deterioration of the disturbance of a flow can be suppressed and the deterioration of the performance of the ejector 10 can be suppressed.
- the length P of the parallel flow path 52 is set to be shorter as the inner diameter D is smaller.
- the length P of the parallel flow path 52 is set so as to satisfy the following formula (1), that is, in proportion to the inner diameter D.
- the length Q of the reduced flow path 51 is also shorter as the inner diameter D is smaller.
- the length of the enlarged flow path 53 is set to a value that does not affect the performance of the ejector 10 even if the lengths of the reduced flow path 51 and the parallel flow path 52 are changed.
- FIG. 3 is a schematic cross-sectional view of the diffuser 40 to which the first attachment 42A is attached
- FIG. 4 is a schematic cross-sectional view of the diffuser 40 to which the second attachment 42B is attached.
- the first attachment 42A has a parallel flow path 52 having an inner diameter D of d1. At this time, the length p1 of the parallel flow path 52 is M ⁇ d1. The length of the reduced flow path 51 is q1.
- the taper angle ⁇ 1 of the portion of the first taper surface 54 formed on the first attachment 42A is the same as the taper angle ⁇ 0 of the portion of the first taper surface 54 formed on the upstream portion 41.
- the taper angle ⁇ 1 of the portion of the second taper surface 55 formed on the first attachment 42A is the same as the taper angle ⁇ 0 of the portion of the second taper surface 55 formed on the downstream portion 43.
- the second attachment 42B has a parallel flow path 52 having an inner diameter D of d2.
- the length p2 of the parallel flow path 52 in the second attachment 42B is M ⁇ d2.
- the length of the reduced flow path 51 is q2.
- the taper angle ⁇ 2 of the portion of the first taper surface 54 formed on the second attachment 42B is larger than the taper angle ⁇ 0 of the portion of the first taper surface 54 formed on the upstream portion 41.
- the taper angle ⁇ 2 of the portion of the second taper surface 55 formed on the second attachment 42B is larger than the taper angle ⁇ 0 of the portion of the second taper surface 55 formed on the downstream portion 43.
- the parallel flow path 52 of the second attachment 42B is the parallel flow path of the first attachment 42A. It is shorter than 52.
- the taper angle ⁇ 2 of the first taper surface 54 of the second attachment 42B is larger than the taper angle ⁇ 1 of the first taper surface 54 of the first attachment 42A.
- the taper angle ⁇ 2 of the second taper surface 55 of the second attachment 42B is larger than the taper angle ⁇ 1 of the second taper surface 55 of the first attachment 42A.
- the taper angle ratio ⁇ 2 / ⁇ 2 of the second attachment 42B is larger than the taper angle ratio ⁇ 1 / ⁇ 1 of the first attachment 42A. That is, when the inner diameter D is changed from d1 to d2, the enlargement rate of the taper angle ⁇ is larger than the enlargement rate of the taper angle ⁇ .
- the maximum discharge pressure Pmax of the diffuser 40 in which the second attachment 42B is incorporated is the first attachment. It becomes higher than the case where 42A is incorporated.
- the taper angle ⁇ is further increased, and the increase in the taper angle ⁇ is suppressed. Thereby, deterioration of the performance of the ejector 1 is reduced.
- the taper angle ⁇ of the first taper surface 54 and the taper angle ⁇ of the second taper surface 55 are large, flow disturbance may occur.
- the increase in the taper angle ⁇ of the first taper surface 54 and the increase in the taper angle ⁇ of the second taper surface 55 can be suppressed to reduce the deterioration of the flow turbulence.
- the maximum discharge pressure Pmax can be increased while ensuring a sufficient suction flow rate.
- inhalation flow rate of a low pressure steam reduces a little.
- the portion formed in the upstream portion 41 of the first taper surface 54 and the portion formed in the downstream portion 43 of the second taper surface 55 are not changed, so the taper angle ⁇ 0 in the upstream portion 41 is not changed.
- the taper angle ratio ⁇ 2 / ⁇ 2 in the second attachment 42B is larger than the taper angle ratio ⁇ 0 / ⁇ 0 in the upstream portion 41 and the downstream portion 43.
- the taper angle ⁇ increases more greatly than the taper angle ⁇ .
- an increase in the taper angle ⁇ is suppressed.
- the method for manufacturing the ejector 1 includes a setting step for setting the dimension of the outlet channel 50 and a preparation step for preparing the diffuser 40 having the dimension set in the setting step.
- the inner diameter D and length P of the parallel flow path 52 in the attachment 42, the taper angle ⁇ of the first taper surface 54, and the taper angle ⁇ of the second taper surface 55 are set.
- the taper angles ⁇ and ⁇ are set so that the taper angle ratio ⁇ / ⁇ increases as the cross-sectional area of the parallel flow path 52, that is, the inner diameter D decreases.
- the inner diameter D (that is, the cross-sectional area) of the parallel flow path 52 that can achieve the target maximum discharge pressure is set.
- the length P of the parallel flow path 52 is set based on the formula (1).
- the taper angles ⁇ and ⁇ are set so that the taper angle ratio ⁇ / ⁇ increases as the inner diameter D decreases.
- the relationship between the inner diameter D and the taper angles ⁇ and ⁇ is obtained in advance.
- the corresponding taper angles ⁇ and ⁇ are set.
- a diffuser 40 that realizes the dimensions of the outlet channel 50 set in the setting step is prepared.
- an attachment 42 that realizes the dimensions of the outlet channel 50 set in the setting step is created.
- an attachment 42 suitable for the operating condition and specifications of the apparatus to which the steam is supplied is Selected.
- the manufacturing method of the ejector 1 further includes an assembly step.
- the nozzle 20, the suction chamber 30, and the diffuser 40 are assembled.
- the upstream portion 41 of the nozzle 20 and the diffuser 40 is attached to the suction chamber 30.
- the attachment 42 and the downstream portion 43 are attached to the upstream portion 41 in a state where the attachment 42 is sandwiched between the upstream portion 41 and the downstream portion 43.
- the attachment 42 having a smaller inner diameter D and a larger taper angle ratio ⁇ / ⁇ than before the replacement.
- Such an attachment 42 is newly created, or such an attachment 42 is selected from a plurality of attachments 42. Then, the attachment 42 of the ejector 10 is replaced with the attachment 42 prepared in the preparation step.
- the ejector 10 includes the nozzle 20 that ejects the high-pressure steam (first fluid) and the low-pressure steam (second fluid) due to the negative pressure that is generated when the nozzle 20 is accommodated and the high-pressure steam is ejected from the nozzle 20.
- a reduced flow channel 51 having a first tapered surface 54, a parallel flow channel 52 having a constant cross-sectional area, connected to the downstream end of the reduced flow channel 51, and connected to the downstream end of the parallel flow channel 52.
- the diffuser 40 further includes an attachment 42 (changing portion) that changes the size of the outlet flow channel 50, and the attachment 42 is parallel.
- the ratio alpha / beta taper angle alpha of the first tapered surface 54 to change the size of the outlet channel 50 so as to increase as the cross-sectional area of the road 52 is smaller in the second tapered surface 55 against the taper angle beta.
- the dimensions of the outlet channel 50 are changed by the attachment 42.
- the cross-sectional area of the parallel flow path 52 that is, the inner diameter D
- the maximum discharge pressure Pmax of the ejector 10 can be changed.
- the dimension of the outlet channel 50 is set so that the taper angle ratio ⁇ / ⁇ increases as the cross-sectional area of the parallel channel 52 decreases. That is, when it is necessary to increase at least one of the taper angles ⁇ and ⁇ in order to cope with the reduction in the cross-sectional area of the parallel flow path 52, the taper angle ⁇ is increased more greatly, and the taper angle ⁇ is increased. Suppress.
- the maximum discharge pressure Pmax of the ejector 10 can be changed, and the disturbance of the flow due to the increase in the taper angles ⁇ and ⁇ can be suppressed, and the deterioration of the performance of the ejector 10 can be reduced.
- the attachment 42 changes the dimension of the outlet channel 50 so that the length P of the parallel channel 52 becomes shorter as the cross-sectional area of the parallel channel 52 becomes smaller.
- the maximum discharge pressure Pmax can be changed while further reducing the deterioration of the performance of the ejector 1.
- the attachment 42 changes the dimension of the outlet channel 50 so that the length P of the parallel channel 52 changes in proportion to the inner diameter D of the parallel channel 52.
- the relationship between the inner diameter D and the length P is kept constant before and after the dimension of the parallel flow path 52 is changed.
- the maximum discharge pressure Pmax can be changed while reducing the deterioration of the performance of the ejector 1.
- a part of the diffuser 40 is configured by an exchangeable attachment 42, and the attachment 42 includes at least a part of the reduced flow path 51, a parallel flow path 52, and at least a part of the enlarged flow path 53.
- the size of the outlet channel 50 is changed by replacing the attachment 42.
- the diffuser 40 is configured such that the attachment 42 can be replaced.
- the plurality of attachments 42 are formed with outlet channels 50 having different dimensions.
- the taper angle ratio ⁇ / ⁇ of the attachment 42 having the smaller inner diameter D is the taper angle of the attachment 42 having the larger inner diameter D. Greater than the ratio ⁇ / ⁇ .
- the maximum discharge pressure Pmax of the ejector 10 can be changed by replacing the attachment 42 without replacing the entire diffuser 40, and the deterioration of the performance of the ejector 10 at that time can be reduced. Can do.
- the dimension of the exit flow path 50 can be changed easily.
- the manufacturing method of the ejector 10 includes a setting step for setting the dimension of the outlet flow channel 50 and a preparation step for preparing the diffuser 40 having the dimension of the outlet flow channel 50 set in the setting step.
- the dimensions of the outlet channel 50 are set so that the ratio ⁇ / ⁇ of the taper angle ⁇ of the first taper surface 54 to the taper angle ⁇ of the second taper surface 55 increases as the cross-sectional area of the parallel channel 52 decreases.
- the diffuser 40 having the outlet channel 50 set in the setting step is prepared by replacing the attachment 42 of the diffuser 40 including the replaceable attachment 42.
- the dimension of the outlet flow path 50 of the diffuser 40 is changed by replacing the attachment 42. Therefore, the dimensions of the reduced flow path 51 and the parallel flow path 52 can be changed without changing the entire diffuser 40.
- the method for setting the outlet flow path of the diffuser 40 includes the step of setting the cross-sectional area of the parallel flow path 52 and the first taper surface with respect to the taper angle ⁇ of the second taper surface 55 as the cross-sectional area of the parallel flow path 52 is smaller. And setting the dimension of the outlet channel 50 so that the ratio ⁇ / ⁇ of the taper angle ⁇ of 54 becomes large.
- the diffuser 40 has a three-part structure, but may have two or four or more parts.
- the fixing method of the attachment 42 is not limited to the method by sandwiching the upstream portion 41 and the downstream portion 42. Any fixing method can be employed as long as the attachment 42 can be fixed.
- the configuration for changing the dimension of the outlet channel 50 is not limited to that by the attachment 42.
- the diffuser may have a deformation mechanism capable of deforming the inner diameter.
- the deformation mechanism partitions the outlet flow channel 50 and has a flexible tubular wall portion, and a plurality of pressing members that are arranged circumferentially on the outer periphery of the wall portion and press the wall portion radially inward (
- a bolt may be included.
- a plurality of sets of pressing members are provided at different positions in the axial direction of the wall portion, with a plurality of pressing members arranged in the circumferential direction of the wall portion as one set. That is, depending on which position in the axial direction is pressed by the pressing member, the length Q of the reduced flow path 51, and consequently the taper angle ⁇ of the first tapered surface 54, the length Y of the parallel flow path 52, and the enlarged flow path 53. , And thus the taper angle ⁇ of the second taper surface 55 can be changed.
- any configuration that can change the dimensions of the outlet channel 50 can be employed.
- the diffuser 40 has a divided structure including the attachment 42, but is not limited to this.
- the diffuser 40 may be an integral structure.
- each of the plurality of diffusers 40 has outlet channels 50 of different dimensions, and the taper angle ratio ⁇ / ⁇ increases as the inner diameter D decreases.
- An appropriate diffuser 40 is selected from these, and incorporated in the ejector 10. That is, in the preparation step in the method for manufacturing the ejector 10, the diffuser 40 having the dimensions (inner diameter D and taper angles ⁇ , ⁇ ) of the outlet channel 50 set in the setting step is selected from the plurality of diffusers 40. Or create a new one.
- both the taper angle ⁇ of the first taper surface 54 and the taper angle ⁇ of the second taper surface 55 are increased by decreasing the inner diameter D from d1 to d2.
- the taper angle ⁇ increases as the inner diameter D decreases, the taper angle ⁇ may remain constant or decrease. Even in such a case, since the increase in the taper angle ⁇ is suppressed, the deterioration of the flow is reduced.
- the technique disclosed herein is useful for an ejector, a method for manufacturing the ejector, and a method for setting an outlet flow path of a diffuser used in the ejector.
- Ejector 20 Nozzle 30 Suction chamber 40 Diffuser 42 Attachment (change part) 42A 1st attachment (change part) 42B 2nd attachment (change part) 50 outlet channel 51 reduced channel 52 parallel channel 53 expanded channel 54 first taper surface 55 second taper surface ⁇ taper angle ⁇ of first taper surface taper angle P of second taper surface length of parallel channel
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- Jet Pumps And Other Pumps (AREA)
- Nozzles (AREA)
Abstract
Description
ここで、Mは定数である。
以上のように、本出願において開示する技術の例示として、前記実施形態を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。また、前記実施形態で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。また、添付図面および詳細な説明に記載された構成要素の中には、課題解決のために必須な構成要素だけでなく、前記技術を例示するために、課題解決のためには必須でない構成要素も含まれ得る。そのため、それらの必須ではない構成要素が添付図面や詳細な説明に記載されていることをもって、直ちに、それらの必須ではない構成要素が必須であるとの認定をするべきではない。
20 ノズル
30 吸引室
40 ディフューザ
42 アタッチメント(変更部)
42A 第1アタッチメント(変更部)
42B 第2アタッチメント(変更部)
50 出口流路
51 縮小流路
52 平行流路
53 拡大流路
54 第1テーパ面
55 第2テーパ面
α 第1テーパ面のテーパ角度
β 第2テーパ面のテーパ角度
P 平行流路の長さ
Claims (7)
- 第1流体を噴出するノズルと、
前記ノズルが収容され、前記ノズルから前記第1流体が噴出することによって生じる負圧により第2流体が吸引される吸引室と、
出口流路を有し、前記吸引室の前記第1流体及び前記第2流体を混合して吐出するディフューザとを備え、
前記出口流路は、下流側に向かって細くなる第1テーパ面を有する縮小流路と、前記縮小流路の下流端に接続され、断面積が一定の平行流路と、前記平行流路の下流端に接続され、下流側に向かって太くなる第2テーパ面を有する拡大流路とを含んでおり、
前記ディフューザは、前記出口流路の寸法を変更する変更部をさらに有し、
前記変更部は、前記平行流路の断面積が小さいほど前記第2テーパ面のテーパ角度に対する前記第1テーパ面のテーパ角度の比が大きくなるように前記出口流路の寸法を変更することを特徴とするエゼクタ。 - 請求項1に記載のエゼクタにおいて、
前記変更部は、前記平行流路の断面積が小さいほど前記平行流路の長さが短くなるように前記出口流路の寸法を変更することを特徴とするエゼクタ。 - 請求項2に記載のエゼクタにおいて、
前記変更部は、前記平行流路の内径に比例して前記平行流路の長さが変化するように前記出口流路の寸法を変更することを特徴とするエゼクタ。 - 請求項1乃至3の何れか1つに記載のエゼクタにおいて
前記ディフューザの一部は、交換可能なアタッチメントで構成され、
前記変更部は、前記アタッチメントであり、
前記アタッチメントは、前記縮小流路の少なくとも一部と、前記平行流路と、前記拡大流路の少なくとも一部とを含んでおり、
前記出口流路の寸法は、前記アタッチメントを交換することによって変更されることを特徴とするエゼクタ。 - 第1流体を噴出するノズルと、前記ノズルが収容され、前記ノズルから前記第1流体が噴出することによって生じる負圧により第2流体が吸引される吸引室と、下流側に向かって細くなる第1テーパ面を有する縮小流路、前記縮小流路の下流端に接続され、断面積が一定の平行流路、及び、前記平行流路の下流端に接続され、下流側に向かって太くなる第2テーパ面を有する拡大流路とを含む出口流路を有し、前記吸引室の前記第1流体及び前記第2流体を混合して吐出するディフューザとを備えたエゼクタの製造方法であって、
前記出口流路の寸法を設定する設定ステップと、
前記設定ステップで設定された前記出口流路の寸法を有する前記ディフューザを準備する準備ステップとを含み、
前記設定ステップでは、前記平行流路の断面積が小さいほど前記第2テーパ面のテーパ角度に対する前記第1テーパ面のテーパ角度の比が大きくなるように前記出口流路の寸法を設定することを特徴とするエゼクタの製造方法。 - 請求項5に記載のエゼクタの製造方法において、
前記準備ステップでは、交換可能なアタッチメントを含むディフューザの前記アタッチメントを交換することによって、前記設定ステップで設定された前記出口流路を有する前記ディフューザを準備することを特徴とするエゼクタの製造方法。 - 下流側に向かって細くなる第1テーパ面を有する縮小流路、前記縮小流路の下流端に接続され、断面積が一定の平行流路、及び、前記平行流路の下流端に接続され、下流側に向かって太くなる第2テーパ面を有する拡大流路とを含む出口流路を有し、エゼクタに用いられるディフューザの出口流路の設定方法であって、
前記平行流路の断面積を設定するステップと、
前記平行流路の断面積が小さいほど前記第2テーパ面のテーパ角度に対する前記第1テーパ面のテーパ角度の比が大きくなるように前記出口流路の寸法を設定するステップとを含むことを特徴とするディフューザの出口流路の設定方法。
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CN201780019732.7A CN108884839B (zh) | 2016-04-01 | 2017-02-15 | 喷射器、喷射器的制造方法以及扩散器的出口流路的设定方法 |
EP17773767.3A EP3438466B1 (en) | 2016-04-01 | 2017-02-15 | Ejector, ejector production method, and method for setting outlet flow path of diffuser |
JP2017527831A JP6352543B2 (ja) | 2016-04-01 | 2017-02-15 | エゼクタ、エゼクタの製造方法及びディフューザの出口流路の設定方法 |
US16/147,040 US20190032679A1 (en) | 2016-04-01 | 2018-09-28 | Ejector, ejector production method, and method for setting outlet flow path of diffuser |
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US16/147,040 Continuation US20190032679A1 (en) | 2016-04-01 | 2018-09-28 | Ejector, ejector production method, and method for setting outlet flow path of diffuser |
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US (1) | US20190032679A1 (ja) |
EP (1) | EP3438466B1 (ja) |
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WO (1) | WO2017169219A1 (ja) |
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DE102018214376A1 (de) * | 2018-08-24 | 2020-02-27 | Audi Ag | Ejektor für ein Brennstoffzellensystem sowie Brennstoffzellensystem |
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- 2017-02-15 EP EP17773767.3A patent/EP3438466B1/en active Active
- 2017-02-15 CN CN201780019732.7A patent/CN108884839B/zh active Active
- 2017-02-15 WO PCT/JP2017/005469 patent/WO2017169219A1/ja active Application Filing
- 2017-02-15 JP JP2017527831A patent/JP6352543B2/ja active Active
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2018
- 2018-09-28 US US16/147,040 patent/US20190032679A1/en not_active Abandoned
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JPS5779152U (ja) * | 1980-10-29 | 1982-05-15 | ||
US6877960B1 (en) * | 2002-06-05 | 2005-04-12 | Flodesign, Inc. | Lobed convergent/divergent supersonic nozzle ejector system |
Also Published As
Publication number | Publication date |
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EP3438466B1 (en) | 2020-04-01 |
CN108884839A (zh) | 2018-11-23 |
EP3438466A4 (en) | 2019-03-27 |
EP3438466A1 (en) | 2019-02-06 |
CN108884839B (zh) | 2020-03-31 |
US20190032679A1 (en) | 2019-01-31 |
JPWO2017169219A1 (ja) | 2018-04-05 |
JP6352543B2 (ja) | 2018-07-04 |
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