# US 11,905,977 B2 · Jet pump unit having an axis of a nozzle and an axis of a mixing tube offset by an angle

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- Number: US 11,905,977 B2
- Document ID: US11905977B2
- Status: Granted
- Kind: B2
- Application number: 17/422,243
- Filed: 2019-12-30
- Published: 2022-03-17
- Granted: 2024-02-20
- Earliest claimed: 2019-01-18
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Armin Richter; Hans-Christoph Magel
- Web page: https://patentgrep.com/patent/US11905977B2

## CPC

- F04F 5/20: for evacuating
- F04F 5/463: {with provisions for mixing}
- F04F 5/52: of evacuating pumps
- F04F 5/54: Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type
- F04F 5/16: displacing elastic fluids
- F04F 5/46: Arrangements of nozzles
- Y02E 60/50: Fuel cells
- F04F: PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G53/00)}
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The invention relates to a jet pump unit (46) for controlling a gaseous medium, in particular hydrogen, comprising a nozzle (1) and a mixing tube unit (30), said mixing tube unit (30) having a longitudinal axis (48) and the nozzle (1) a longitudinal axis (18). The longitudinal axis (48) of the mixing tube unit (48) and the longitudinal axis (18) of the nozzle (1) include an angle (α) with each other.

## Claims

### Claim 1

A jet pump unit (46) for controlling a gaseous medium, the jet pump unit (46) having a nozzle (1) and a mixing tube unit (30), wherein the mixing tube unit (30) has a longitudinal axis (48) and the nozzle (1) has a longitudinal axis (18), wherein the longitudinal axis (48) of the mixing tube unit (30) and the longitudinal axis (18) of the nozzle (1) are at an angle α to one another,
wherein the mixing tube unit (30) has an outflow channel (23), which outflow channel (23) is in the form of a transverse bore in a pump housing (49) of the mixing tube unit (30) and is arranged radially with respect to the longitudinal axis (48) of the mixing tube unit (30),
wherein the longitudinal axis (18) of the nozzle (1) is inclined away from a direction of the outflow channel (23) in the mixing tube unit (30).

### Claim 2 (depends on 1)

The jet pump unit (46) as claimed in claim 1, wherein the angle α is between 2° and 5°.

### Claim 3 (depends on 1)

The jet pump unit (46) as claimed in claim 1, wherein the mixing tube unit (30) has a flow-guiding element (53), which flow-guiding element (53) is in the form of a cover element at an end (50) of the mixing tube unit (30) at the outflow channel (23) and is integrated into the pump housing (49), whereby a flow of gaseous medium in the mixing tube unit (30) can be diverted into the direction of the outflow channel (23).

### Claim 4 (depends on 1)

The jet pump unit (46) as claimed in claim 1, wherein the pump housing (49) has a stepped passage bore (42), wherein the nozzle (1) is received fully in the stepped passage bore (42) of the mixing tube unit (30).

### Claim 5 (depends on 4)

The jet pump unit (46) as claimed in claim 4, wherein the nozzle (1) is arranged on a dosing valve (100) with a valve housing (12) and is connected fixedly to the valve housing (12).

### Claim 6 (depends on 5)

The jet pump unit (46) as claimed in claim 5, wherein a passage opening (21) of the dosing valve (100) is formed in the nozzle (1), wherein the passage opening (21) opens out into the stepped passage bore (42).

### Claim 7 (depends on 6)

The jet pump unit (46) as claimed in claim 6, wherein the dosing valve (100) has a closure element (2) with an elastic sealing element (3), which closure element (2) interacts with a valve seat (4) for opening and closing the passage opening (21) and is in the form of a flat seat at the nozzle (1).

### Claim 8 (depends on 5)

The jet pump unit (46) as claimed in claim 5, wherein the dosing valve (100) has an inflow channel (31) for the gaseous medium, wherein the inflow channel (31) is formed at least partially in the pump housing (49).

### Claim 9 (depends on 5)

The jet pump unit (46) as claimed in claim 5, wherein the pump housing (49) of the mixing tube unit (30) has at least one step (19, 20), by way of which at least one step (19, 20) the dosing valve (100) is guided in the pump housing (49).

### Claim 10 (depends on 1)

The jet pump unit (46) as claimed in claim 1, wherein the nozzle (1) has a protuberance (33), which protuberance (33) projects into an intake region (44) of the mixing tube unit (30).

### Claim 11 (depends on 1)

A fuel cell arrangement with a jet pump unit (46) as claimed in claim 1 for controlling a supply of hydrogen to a fuel cell.

### Claim 12 (depends on 1)

The jet pump unit (46) as claimed in claim 1, wherein the gaseous medium is hydrogen.