823results about "Jet pumps" patented technology

The disclosure describes an expanding drill device for expanding a pilot bore by moving the expanding drill device along a specified drilling line comprising: a housing; a drill head that has a cutting wheel which is arranged on the drill side of the expanding drill device so as to be rotatably mounted and driven about a rotational axis and relative to the housing and on which at least one drill tool for loosening the ground or the rock is arranged; and a drill-side connection for producing a connection to a pipe section located in the pilot bore on the drill side, wherein the drill side centrally has at least one receiving chamber for the loosened ground or the loosened rock, said receiving chamber being connected to a material conveyor device of the expanding drill device.

A bleed system including a jet pump system configured to provide a supply gas comprising at least one of a higher pressure gas, a lower pressure gas, or a mixture of the higher pressure gas and the lower pressure gas. A needle body defines a throat region between a nozzle wall and the needle body. The needle body is configured to cause a gap between a rear needle surface of the needle body and the nozzle wall to decrease as the rear needle surface extends toward the throat region. The jet pump system is configured to discharge the higher pressure gas through the throat region and mix the higher pressure gas and the lower pressure gas in a mixing portion of an exhaust portion.

The embodiment of the invention discloses an ultrahigh compression ratio adjustable ejector and a variable working condition performance optimization design method thereof. The adjustable ejector comprises a nozzle, an adjusting cone, a suction chamber, a mixing chamber and a diffusion chamber, wherein working fluid is introduced into the nozzle, the adjusting cone is arranged at the throat part of the nozzle, and the fluid to be ejected is introduced into the suction chamber; the adjusting cone is formed by alternately and repeatedly connecting cylindrical surface sections and conical surface sections, and the adjusting cone can axially move; the method comprises the steps that the pressure of working fluid input into the adjustable ejector is monitored; when the pressure of the working fluid is changed between the first pressure and the second pressure, the adjusting cone is axially moved, and each cylindrical surface section directly faces the throat part in sequence, so that step type adjustment of the pressure of the working fluid is realized; when the pressure of the working fluid is changed between the second pressure and the fourth pressure, the adjusting cone is axially moved, and each conical surface section directly faces the throat part in sequence, so that the continuous adjustment of the pressure of the working fluid is realized; the mass flow of the ejected fluid in the adjustable ejector belongs to a preset range; the first pressure, the second pressure, the third pressure and the fourth pressure are gradually increased in sequence.

The invention relates to the technical field of server cooling, in particular to a server pneumatic vacuum circulation cooling device and a working method.The cold air injection conduction unit is provided with a cold air pipeline, a compressed air source is arranged at the head end of the cold air pipeline, and the tail end of the cold air pipeline is connected with a plurality of cold air injection heads which are located in a flow guide cover at the tail end of the cold air pipeline; the heating elements face the corresponding heating elements; compressed air within a set temperature range is transmitted into the cold air injection head through the cold air pipeline and used for injecting air for heat dissipation to the surface of the heating element, and the heating element is located in the secondary side space; the head end of the hot air pipeline faces the primary side space, the tail end of the hot air pipeline is connected with a hot air absorption head, and the hot air absorption head faces the heating element; and the hot gas absorbing head absorbs mixed gas overflowing from the hot gas radiating port by utilizing vacuum and discharges the mixed gas into the primary side space. The low-pressure state after heat dissipation is adapted through vacuum, and the requirements of the secondary side of the server for pressure balance, heat isolation and airflow directionality are met at the same time.

The invention relates to the technical field of oil and gas field and coal bed gas field mining equipment, in particular to a wellhead suspension centrifugal pump drive double-pipe jet flow drainage and mining device and a using method. According to the technical scheme, a lower tubing head four-way joint, a middle tubing head four-way joint and an upper tubing head four-way joint are sequentially installed on a bottom flange, a motor is installed on the upper portion of the upper tubing head four-way joint, and an inner pipe plug-in pump core catcher is installed at the lower end of a submersible water injection centrifugal pump; the lower end of the inner pipe inserted pump core catcher is movably connected with an inner layer oil pipe, and a pump core installed in the double-pipe jet pump is arranged in a pump cylinder of the jet pump. The device has the advantages that due to the fact that a packer is omitted and the device is connected with the double-pipe jet pump, sand-containing liquid in a well can be sucked, and exploitation of natural gas or coal bed gas can be achieved; the inner pipe is inserted into an elastic clamping jaw of the pump core catcher to catch the pump core; and the submersible water injection centrifugal pump and the pump core can be lifted to the ground at one time by hoisting the motor at a ground wellhead, so that the maintenance is convenient.

The invention relates to the technical field of oil and gas field and coal bed gas field drainage and mining, in particular to a buoyancy lift pump core ring jet flow pump and a using method. According to the technical scheme, a low-density buoyancy lift pump core is installed in an inner cavity of a pump cylinder, an annular gap is formed between the low-density buoyancy lift pump core and the inner wall of the pump cylinder, a formation liquid suction inlet is formed in the lower side of the annular gap, an annular throat pipe is arranged below the formation liquid suction inlet, a diffusion cavity is formed below the annular throat pipe, and a pump core supporting seat is arranged at the bottom of the diffusion cavity; a mixed liquid outlet is formed in the lower side of the diffusion cavity, and the diffusion cavity is communicated with the mixed liquid discharge cavity. The low-density buoyancy lift pump core has the advantages that due to the fact that the overall density of the low-density buoyancy lift pump core is adjusted and reduced, the power hydraulic pressure and the using amount for pulling out the low-density buoyancy lift pump core can be reduced, and operation cost is reduced; in addition, the low-density buoyancy lift pump core is simple in structure, an annular jet flow structure is formed between the low-density buoyancy lift pump core and the pump cylinder, the liquid drainage and production amount is increased, the working condition of the low-density buoyancy lift pump core suitable for pumping media is wider, and the manufacturing cost is lower.

A bleed system including a jet pump system configured to provide a supply gas comprising at least one of a higher pressure gas, a lower pressure gas, or a mixture of the higher pressure gas and the lower pressure gas. A needle body defines a throat region between a nozzle wall and the needle body. The needle body is configured to cause a gap between a rear needle surface of the needle body and the nozzle wall to decrease as the rear needle surface extends toward the throat region. The jet pump system is configured to discharge the higher pressure gas through the throat region and mix the higher pressure gas and the lower pressure gas in a mixing portion of an exhaust portion.

The invention belongs to the technical field of cells, and relates to a hydrogen ejector for a fuel cell, which comprises a mixing chamber, a buffer chamber, a jet flow gas inlet, a liquid discharge hole, an ejection chamber and a plurality of jet flow holes, one end of the first nozzle is located outside the buffer chamber, the other end of the first nozzle penetrates through the side wall of the buffer chamber and then is located in the injection chamber, the part, located in the injection chamber, of the first nozzle is of a gradually-shrunk tubular structure, and a plurality of first arc-shaped rotational flow grooves are evenly formed in the position, close to the gradually-shrunk tubular structure, of the side face of the first nozzle in the circumferential direction of the first nozzle; each first arc-shaped rotational flow groove is formed in the length direction of the first nozzle, and the positions of the multiple first arc-shaped rotational flow grooves correspond to the positions of the multiple jet flow holes in a one-to-one mode. According to the invention, unreacted hydrogen entering the injection chamber can form rotational flow, so that water vapor is separated under the action of centrifugal force, the content of the water vapor in the unreacted hydrogen is reduced, the water logging phenomenon caused by the fact that excessive water vapor increases the resistance of the hydrogen entering an electrode is avoided, and the performance of the fuel cell is improved.

The invention provides a portable bladeless fan which is characterized in that a first air inlet part is arranged on the rear side, a first air outlet part is arranged on the front side, and the first air inlet part and the first air outlet part are communicated in a shell; the pressurizing piece is connected with the front side of the shell, the pressurizing piece is provided with a negative pressure channel, and the negative pressure channel guides air on the radial outer side of the shell to the radial inner side of the shell; the mixed flow fan is located in the shell and connected to the rear side of the pressurizing piece, and the mixed flow fan rotates around a rotating shaft to generate airflow; a pressurizing flow guide channel is formed between the mixed flow fan and the shell and between the pressurizing piece and the shell, air enters the pressurizing flow guide channel from the first air inlet part, pressurized mixed flow is formed in the pressurizing flow guide channel and then is exhausted from the first air outlet part, and meanwhile air on the radial outer side of the shell is driven to flow through the negative pressure channel and is guided out from the radial inner side of the shell. On the basis that it is ensured that the first air outlet part exhausts air with enough air volume and air pressure, the air volume and the air supply distance are further increased through air guiding of the negative pressure channel.

The invention discloses a gas ejector and turbine vacuum pump combined type vacuumizing system and method, and relates to the field of vacuum equipment, and the gas ejector and turbine vacuum pump combined type vacuumizing system comprises an incoming flow device used for providing ejected gas for an ejector system; the ejector system is used for sucking gas from the incoming flow device, carrying out primary pressurization treatment on the sucked gas, and transmitting the gas subjected to the primary pressurization treatment to the buffer cavity system; the buffer cavity system is used for rectifying and stabilizing air flow from the ejector system and the atmospheric environment or a first preset air source, weakening mechanical vibration transmitted to the turbine vacuum pump system by the ejector system, and providing starting flow, anti-surge protection and uniform and stable air inlet conditions for the turbine vacuum pump system; the turbine vacuum pump system is used for secondarily pressurizing the gas from the buffer cavity system and discharging the gas into the atmospheric environment; the invention provides a gas ejector and turbine vacuum pump combined type vacuum-pumping system which is high in performance and stability and suitable for high vacuum and intermittent incoming flow working conditions.

Various examples are provided related to airlift pumping of downhole geothermal fluids. In one example, an airlift system includes a compressor; a gas sparger head in a wellbore of a geothermal well, and a pressure head recycle assembly. The sparger head produces artificial lift of the geothermal fluids by injecting a gas resulting in a difference in density downhole. The entrained gas can be extracted by the pressure head recycle assembly, compressed, and reinjected downhole. The geothermal fluid at the well head can be used in direct use applications or in a thermodynamic cycle to make shaft power. The gas sparger head can include a venturi shaped passage extending through the gas sparger head and a bubble orifice including gas orifices radially spaced about a narrow portion of the venturi shaped passage. The gas orifices can have a corresponding resonant chamber through which the gas (e.g., air) is provided.

The invention relates to the technical field of oil and gas field and coal bed gas field mining and drainage engineering, in particular to a multi-stage high-speed centrifugal pump driven underground sand blockage prevention jet flow drainage and drainage system and a using method. According to the technical scheme, the output end of a horizontal centrifugal pump is connected to a well mouth through a pipeline, the sand blocking prevention tubular jet pump is installed on an underground oil production layer through an oil pipe, a plurality of sand setting bearing umbrellas are installed on the small-diameter oil pipe in a segmented mode, and a plurality of sand setting bearing covers are installed on the oil pipe in a segmented mode. The problems that a pump shaft of a multi-stage high-speed centrifugal pump is large in length and high in rotating speed and is in axial fluctuation in the starting and working process of the pump, consequently, a common coupling force transmission and dynamic sealing structure is difficult to adapt to the high-rotating-speed working condition, and the fault rate is high are solved. In addition, the sand blockage prevention tubular jet pump is improved, the sand blockage prevention performance of the sand blockage prevention tubular jet pump is enhanced, the sand blockage prevention tubular jet pump is novel and simple in structure, safe and reliable, a plurality of sand setting bearing umbrellas are installed on a small-diameter oil pipe in a segmented mode, and sand blockage of an underground pump and a tubular column caused by the fact that setting sand sinks into a pump cylinder is avoided.

The invention relates to an underground multi-mode overflow monitoring system and method, and belongs to the technical field of well drilling monitoring, the system is arranged in an axial through hole of a drill collar body, and the system comprises a central fluid channel assembly comprising a Venturi tube section communicated with the through hole; the annular sensor array assembly comprises a barrel which is arranged on the outer side of the Venturi tube section in a sleeving mode and attached to the inner wall of the drill collar body, an annular flow channel is formed in the position, corresponding to a high-pressure area of the Venturi tube section, in the barrel, one end of the annular flow channel is closed, and the other end of the annular flow channel is a Venturi drainage ejector communicated to the high-pressure area of the Venturi tube section; the annular flow channel is provided with a plurality of drainage channels, and the annular flow channel is provided with a multi-mode sensor along the circumferential inner wall of the annular flow channel; a plurality of sampling holes communicated with the drainage channel are formed in the drill collar body; the system further comprises a processor, all the sensors are connected with the processor, and the processor communicates with the measurement-while-drilling system. The method and the device have the effect of improving the stability of monitoring work in a complex drilling environment.

The present invention relates to the technical field of ejectors, and specifically discloses an ejector with a wide flow ratio that is easy to adjust, which is used to solve the problem of single adjustment in the prior art; the ejector comprises a first pipe body and a second pipe body, the exhaust end of the second pipe body is provided with an exhaust pipe section, and a contracting conical section is between the exhaust pipe section and the second pipe body. The other end of the exhaust pipe section is connected to the expansion pipe section, and the second pipe body is connected to the first pipe body by a connecting piece. The outside of the first pipe body is connected to a high-pressure air intake pipe, and the outside of the second pipe body is connected to a low-pressure air intake pipe. The present invention is adjusted according to existing needs, and the equipment can be disassembled and assembled to facilitate later maintenance. The ventilation cross-section of the air intake position can also be adjusted, and the low-pressure air intake position can also be adjusted. The two do not interfere with each other, thereby meeting the use of different positions.

A jet ejector arrangement, including a jet ejector with an internal nozzle having a base and a tip and, on a common longitudinal axis, an inlet for a motive fluid at the base and an outlet for the accelerated motive fluid at the tip; a hollow tube having a base and surrounding the internal nozzle, such that the base of the hollow tube surrounds the base of the nozzle, and extending downstream the tip such that the chemical components inside the hollow tube reside therein for 0.1 to 5 seconds, wherein the flow direction in the hollow tube is defined by the flow direction of the motive fluid, for mixing and reacting the motive fluid with an additional fluid feed in a reaction zone in the hollow tube, thereby providing a reacted fluid; and an opening in the wall of the hollow tube for entry of the additional fluid feed.

The invention relates to a jet pump (100) for conveying a suction fluid (242) in a refrigerant circuit (200) of a temperature control system using a propellant fluid (231) and utilizing the Bernoulli effect, wherein the jet pump (100) has a primary nozzle (103) for accelerating the propellant fluid, a secondary connection interface (102) for supplying the suction fluid, a mixing tube (104) downstream of the primary nozzle (103) and downstream of the secondary connection interface (102), and a diffuser (105) downstream of the mixing tube (104), wherein in an end section (140) of the mixing tube (104), which is located at an end of the mixing tube (104) furthest from the primary nozzle (103) and closer to the diffuser (105), a thrust edge (130) is provided which is configured to act in a supersonic The flow in the mixing tube (104) is intended to trigger a compression pulse in the final section (140). Furthermore, a refrigerant circuit (200) with such a jet pump (100) is proposed.

The invention discloses an exhaust gas waste heat injection cooling system and a vehicle. The waste gas waste heat injection cooling system comprises a generator, a water supply device and an injection device. An input port of the generator is connected with an exhaust port of the engine for introducing tail gas; the water supply device is connected with the generator and used for conveying a cooling medium to the generator to cool tail gas; the injection device is connected with the generator, water vapor formed by heating the cooling medium by the generator is conveyed to the injection device, and the injection device is further connected with a cabin area of the vehicle and used for introducing cooling airflow in the cabin area. The air inlet flow of the cabin area of the vehicle is increased through the injection device, the heat dissipation efficiency is remarkably improved, the utilization rate of waste gas waste heat is increased, and meanwhile the problem of heat damage caused by the too high tail gas temperature of the vehicle can be solved.

The invention discloses a method for controlling the choking state of an ejector in a hydrogen supply system of a hydrogen fuel cell, which comprises the following steps of: constructing an SIMULINK model containing a hydrogen tank, a pressure reducing valve, a proportional valve, the ejector, a hydrogen supply pipeline, an anode stack and a circulating pump, exciting the proportional valve by a PRBS signal, acquiring the output of a back pressure ratio (pion = Pb / P), acquiring a dynamic model of the ejector through system identification, and calculating the choking state of the ejector in the hydrogen supply system of the hydrogen fuel cell. A fuzzy PID algorithm is adopted to control the opening degree of the proportional valve; the method specifically comprises the steps that in a hydrogen supply system, a model is updated by replacing proportional valve parameters with PRBS signals; the pi deviation and the change rate of the pi deviation serve as input, the opening degree of a proportional valve is adjusted through fuzzification, rule reasoning and defuzzification, and the ejector is kept in a choked state; the method is suitable for choking state control of the fuel cell hydrogen supply system, through cooperation of dynamic modeling and a control algorithm, in the typical power range of the fuel cell, the system stability and the hydrogen recovery efficiency are remarkably improved through the control method, and an efficient solution is provided for variable working condition operation of the fuel cell.

The present invention relates to a vertical vacuum gripper device. The gripper device includes a cylindrical body incorporating a vertically mounted air ejector, a connector fastened to the bottom of the body, and a suction pad connected to the connector. The body includes an upper cover with multiple air supply ports, a waste pipe formed on the lower bottom surface parallel to the ejector and communicating with the interior of the pad, an air exhaust port formed on the lower side, and a passage formed on the bottom surface communicating with the interior of the upper body and the lower pad. This forms a vacuum flow path extending from a first supply port to the ejector and then to the exhaust port, and a waste flow path extending from a second supply port to the waste pipe and then to the interior of the pad.

The utility model relates to the technical field of negative pressure devices, in particular to a water circulation negative pressure device which comprises a negative pressure tank connected with a negative pressure pipe. The inlet end of the water circulation vacuumizing assembly is communicated with the negative pressure tank through an air inlet pipe, the outlet end of the water circulation vacuumizing assembly is connected with a circulating water assembly through an exhaust pipe, and the circulating water assembly is provided with an exhaust port; and one end of the drainage pipe is connected with the lower end of the circulating water assembly, the other end of the drainage pipe is connected with the inlet end of the water circulation vacuumizing assembly, a first valve control assembly is installed on the drainage pipe, and the first valve control assembly is electrically connected with the control assembly. Noise and energy consumption are reduced, and the device is not sensitive to impurities in gas.

A compressor is provided for use in domestic appliances. The compressor includes: an impeller including an inlet, an outlet, a hub defining a rotational axis of the impeller, a plurality of impeller blades that extend from the hub, and a shroud that at least partially surrounds the impeller blades; a housing that at least partially surrounds the shroud and that is coaxially arranged with respect to the rotational axis of the impeller to allow the impeller to rotate within the housing; a leakage flow path defined between the shroud and the housing leading from a leakage flow path inlet to a reinjection port, and a labyrinth seal arrangement provided in the leakage flow path. The labyrinth seal arrangement includes one or more shroud rings interdigitated with one or more housing rings so as to form a tortuous flow path for fluid flowing through the leakage flow path.

The invention provides a portable bladeless fan which comprises a shell, a first air inlet part is arranged on the rear side of the shell, a first air outlet part is arranged on the front side of the shell, and the first air inlet part and the first air outlet part are communicated in the shell; the pressurizing piece is connected with the front side of the shell, the pressurizing piece comprises an end face arranged forwards, the axial upper end face is located behind the first air outlet part, and a first matching structure is arranged on the end face; the mixed flow fan is located in the shell and connected to the rear side of the pressurizing piece, and the mixed flow fan rotates around a rotating shaft to generate airflow; the fixing piece is used for fixing the portable bladeless fan to an external object and comprises a second matching structure, and the second matching structure is matched with the first matching structure so that the fixing piece can be detachably fixed to the end face; a pressurization flow guide channel is formed between the mixed flow fan and the shell and between the pressurization piece and the shell, and air enters the pressurization flow guide channel from the first air inlet part, forms pressurization mixed flow in the pressurization flow guide channel and then is exhausted from the first air outlet part.

An ejector 100 includes a convergent portion 101; a cylindrical throat 102 downstream of the convergent portion and having a length Tl and a diameter Td; and a divergent portion 103 downstream of the

The utility model discloses an environment-friendly vacuum unit which comprises a vacuum chamber and a circulating water tank, a cleaning mechanism used for cleaning solid impurities in the circulating water tank is arranged on the circulating water tank, the cleaning mechanism comprises a suction mechanism, a filtering mechanism and a backflow mechanism, the suction mechanism comprises a mounting bin, a sewage pump and a suction end, the filtering mechanism is a filtering tank, and the backflow mechanism is a backflow mechanism. The backflow mechanism comprises a first water pump and a backflow opening. By mounting the mounting bin and the suction end, when impurities in the circulating water tank need to be cleaned, the motor and the sewage pump are started, the pipeline and the suction end move at the bottom of the water tank to suck the impurities, the sucked impurities are conveyed to the filter tank through the sewage pump, sewage enters the filter tank and is filtered by the filter cartridge, and the sewage is filtered by the filter cartridge along with starting of the first water pump. The filtered clean water is conveyed back into the circulating water tank through the return pipe, so that the environment-friendly water jet vacuum unit can efficiently clean impurities in the circulating water tank, and the resource utilization rate and the overall performance of the unit are improved.

The device for reintroducing steam into a volatile liquid comprises a tank (10) for the volatile liquid, a circulation pump (14) and connecting conduits (13, 113, 213) for pumping liquid from said tank (10) through a mixing zone or mixing device (12, 112, 212) for mixing the steam with the liquid, and a conduit (15, 115, 215) for conveying steam from the space above the level of the liquid to said mixing zone or mixing device (12, 112, 212), the mixing zone or mixing device (12, 112, 212) being arranged to ensure a pressure independent of the level of the liquid in the tank (10).

The utility model relates to the technical field of bladeless fans, and provides a bladeless fan which comprises a shell, fan blades and a sound absorption assembly. Wherein the shell is provided with an air duct cavity, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the air duct cavity, the fan blades are rotatably arranged in the air duct cavity, the sound absorption assembly is located in the air duct cavity, the sound absorption assembly and the inner wall of the shell define at least two sound absorption cavities, and the at least two sound absorption cavities are arranged in the air duct cavity at intervals. The bladeless fan provided by the utility model can solve the problem of loud noise of the bladeless fan.

The invention relates to a multi-stage vacuum generator applied to the field of vacuum generators, in the multi-stage vacuum generator, through the arrangement of a plurality of reducing vacuum shafts, traditional first-stage vacuum is improved into multi-stage vacuum, the Laval structure in a traditional vacuum generator is changed, the air inlet flow is reduced, and the air inlet efficiency is improved. Meanwhile, the vacuum degree and the vacuum flow are greatly improved, so that when the vacuum generator is used for carrying and moving materials, the stability is greatly improved, the probability that the materials fall off is reduced, meanwhile, through the arrangement of a plurality of sealing plugs and negative pressure holes, the vacuum pressure can be adjusted according to actual needs, and the adaptability is higher; in addition, in cooperation with the arrangement of a disassembly-free cleaning rope, the interior can be cleaned under the condition that only the outer sleeve is disassembled, and compared with the mode that the outer sleeve is completely disassembled for cleaning in the prior art, the situation that recombination is difficult after disassembly is effectively avoided, and then the utilization rate of the vacuum generator is effectively guaranteed.

A blower is disclosed. The blower of the present disclosure comprises: a fan for producing an air flow; a lower body providing an inner space in which the fan is installed and having an intake hole through which air passes; a side body disposed on the lower body and providing an inner space in which air discharged from the fan flows; and a rear body disposed at the rear of the side body, wherein: the side body includes an opening formed at the rear end of the side body and communicating with the inner space of the side body; and the rear body covers a part of the side body at the rear of the opening.

Ejector for use in a refrigeration circuit device, which features: a drive-side nozzle (31) designed to expand a drive-side coolant and accelerate it to a supersonic speed and inject the drive-side coolant as a drive-side injection coolant in a gas-liquid two-phase state; and a body (32) which includes: a coolant suction port (321) designed to draw suction-side coolant; a suction-side nozzle (322) designed to expand and inject the suction-side coolant, which is drawn in as suction-side injection coolant through the coolant suction port (321); a mixing section (323) designed to mix the suction-side injection coolant injected from the suction-side nozzle (322) and the drive-side injection coolant injected from the drive-side nozzle (31); and a diffuser section (324) designed to convert kinetic energy of the mixed coolant formed from the suction-side injection coolant and the drive-side injection coolant mixed in the mixing section (323) into pressure energy, wherein: the drive-side nozzle (31) has a converging section (31b), a neck section (31c) and a diverging section (31d), wherein the diverging section (31d) has a passage cross-sectional area for the passage of the coolant, which is progressively enlarged from the neck section (31c) to a drive-side injection port (31e); the drive-side nozzle (31) is arranged coaxially in a cylindrical space formed on an inside of the body (32); a coolant passage of the suction-side nozzle (322) is formed between an outer circumferential surface of the diverging section (31d) and an inner circumferential surface of the body (32) and has a cross-section that is formed in an annular shape; the drive-side injection port (31e) of the drive-side nozzle (31) and a suction-side injection port (322a) of the suction-side nozzle (322) are open such that an injection direction of the drive-side injection coolant injected by the drive-side injection port (31e) and an injection direction of the suction-side injection coolant injected by the suction-side injection port (322a) coincide; a pressure of the drive-side injection coolant is higher than a pressure of the suction-side injection coolant; and when the mixed coolant flows out of the mixing section (323) and into the diffuser section (324), a pressure of the mixed coolant measured on a central axis of the mixing section (323) and a pressure of the mixed coolant measured on a wall surface of the mixing section (323) are equal, while a flow velocity of the mixed coolant is a subsonic velocity.