Jet pump

Abstract

A jet pump is disclosed through which a liquid flows. The jet pump includes a jet nozzle including an injection port for injecting the liquid. The jet pump also includes a throat pipe including a throat passage that extends linearly. The throat pipe includes a downstream side with an open part, and the liquid injected from the injection port flows into the throat passage. The liquid in the throat passage forms a liquid seal across a cross section of the throat passage to generate negative pressure, which introduces the liquid into the throat passage.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description made with reference to the accompanying drawings, in which like parts are designated by like reference numbers and in which:

FIG. 1 is a schematic view showing one embodiment of a fuel system including a jet pump installed in a fuel tank;

FIG. 2 is a cross sectional view of one embodiment of the jet pump;

FIG. 3 is a cross sectional view of another embodiment of the jet pump;

FIG. 4 is a cross sectional view of another embodiment of the jet pump;

FIG. 5 is a cross sectional view of another embodiment of the jet pump;

FIG. 6 is a cross sectional view of another embodiment of the jet pump;

FIG. 7 is a cross sectional view of the jet pump of FIG. 6 taken along lines VII-VII; and

FIG. 8 is a cross sectional view of another embodiment of the jet pump.

Claims

1. A jet pump through which a liquid flows comprising: a jet nozzle including an injection port for injecting the liquid; anda throat pipe including a throat passage that extends linearly, the throat pipe including a downstream side with an open part, wherein the liquid injected from the injection port flows into the throat passage, and wherein:the liquid in the throat passage forms a liquid seal across a cross section of the throat passage to generate negative pressure, which introduces the liquid into the throat passage; andthe throat passage is disposed at a positive, acute angle relative to a vector of gravity such that the open part of the throat pipe is disposed above the injection port.

2. A jet pump according to claim 1, further comprising: a cup in fluid communication with the open part of the downstream side of the throat pipe that holds liquid therein, wherein:the cup includes at least one collision wall surface that opposes the open part of the downstream side of the throat pipe, the collision wall surface including a top end that is closer to the open part of the downstream side of the throat pipe than a lower end of the collision wall surface.

3. A jet pump according to claim 1, further comprising: a core member provided in the throat pipe and extending in the flow direction of the liquid; wherein:the throat passage is defined between an inner wall of the throat pipe and an outer wall of the core member;a cross sectional area of the throat passage gradually decreases in a direction of liquid flow in the throat passage due to the core member.

4. A jet pump according to claim 1, further comprising a chamber member including a receiving chamber providing fluid communication between the injection port and the throat passage, the chamber member further including a suction port for drawing the liquid into the receiving chamber due to negative pressure.

5. A jet pump according to claim 1, wherein the jet pump is provided in a tank divided by a partition wall into a main tank chamber and a sub tank chamber, and wherein the jet pump transfers the liquid in the sub tank chamber to the main tank chamber over the partition wall.

6. A jet pump through which a liquid flows comprising: a jet nozzle including an injection port for injecting the liquid; anda throat pipe including a throat passage, the throat pipe including a downstream side, wherein the liquid injected from the injection port flows into the throat passage, wherein:the liquid in the throat passage forms a liquid seal across a cross section of the throat passage to generate negative pressure, which introduces the liquid into the throat passage; anda cup in fluid communication with the open part of the downstream side of the throat pipe that holds liquid therein, wherein:the cup includes at least one collision wall surface that opposes the open part of the downstream side of the throat pipe, the collision wall surface including a top end that is closer to the open part of the downstream side of the throat pipe than a lower end of the collision wall surface.

7. A jet pump according to claim 6, wherein the collision wall surface is disposed at a positive, acute angle relative to an axis of the throat pipe such that the top end of the collision wall surface is closer to the downstream side of the throat pipe than a lower end of the collision wall surface.

8. A jet pump according to claim 7, wherein the cup further includes an opposing wall surface that is spaced from and is opposite from the collision wall surface, wherein the opposing wall surface is disposed approximately parallel to the collision wall surface.

9. A jet pump according to claim 6, wherein the top end of the collision wall surface extends toward the downstream side of the throat pipe.

10. A jet pump according to claim 6, further comprising: a core member provided in the throat pipe and extending in the flow direction of the liquid; wherein:the throat passage is defined between an inner wall of the throat pipe and an outer wall of the core member;a cross sectional area of the throat passage gradually decreases in a direction of liquid flow in the throat passage due to the core member.

11. A jet pump according to claim 6, further comprising a chamber member including a receiving chamber providing fluid communication between the injection port and the throat passage, the chamber member further including a suction port for drawing the liquid into the receiving chamber due to negative pressure.

12. A jet pump according to claim 6, wherein the jet pump is provided in a tank divided by a partition wall into a main tank chamber and a sub tank chamber, and wherein the jet pump transfers the liquid in the sub tank chamber to the main tank chamber over the partition wall.

13. A jet pump through which a liquid flows comprising: a jet nozzle including an injection port for injecting the liquid;a chamber member including a receiving chamber that is in fluid communication with the injection port, and further including a suction port for drawing in the liquid to the receiving chamber;a throat pipe including a throat passage in fluid communication with the receiving chamber, wherein the liquid in the throat passage forms a liquid seal across a cross section of the throat passage to generate negative pressure, which introduces the liquid into the throat passage; anda core member provided in the throat pipe and extending in the flow direction of the liquid; wherein:the throat passage is defined between an inner wall of the throat pipe and an outer wall of the core member;a cross sectional area of the throat passage gradually decreases in a direction of liquid flow in the throat passage due to the core member.

14. A jet pump according to claim 13, wherein the core member includes an upstream end that has a convex, curved surface.

15. A jet pump according to claim 13, wherein the core member includes an upstream end that has a conic surface.

16. A jet pump according to claim 13, wherein the jet pump is provided in a tank divided by a partition wall into a main tank chamber and a sub tank chamber, and wherein the jet pump transfers the liquid in the sub tank chamber to the main tank chamber over the partition wall.