Valve unit fixing structure and fluid pump using the same

Patent metadata

Field	Value
Publication number	US-10865900-B2
Application number	US-201916361999-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Mar 27, 2018
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

The present invention provides an inexpensive valve unit fixing structure that enables a valve unit to be easily fixed without the need for unitization in advance, and a fluid pump that enables a discharge valve and a relief valve to be incorporated in a compact manner. The valve unit fixing structure includes a main body (3), a discharge communication passage (9) provided inside the main body (3), a discharge valve unit (10) which is provided in the main body (3) and which opens/closes the discharge communication passage (9), and deformed fixing parts (35) which are formed by plastically deforming the main body (3) and which fix the discharge valve unit (10) to the main body (3).

First claim

What is claimed is:

1. A valve unit fixing structure comprising:
a main body;
a main body flow passage which is provided in the main body and through which a fluid passes;
a valve unit which is provided in the main body and which opens/closes the main body flow passage, and
a deformed fixing part which is formed by plastically deforming the main body and which fixes the valve unit to the main body;
wherein the main body includes a recess which is in communication with the main body flow passage and which extends in a reference direction,
the valve unit includes:
a valve seat section having a valve seat;
a valve body which comes in contact with the valve seat to close the main body flow passage;
a spring member which urges the valve body toward the valve seat section; and
a holder which accommodates the spring member,
wherein the valve unit is fixed to the main body by at least a part of the valve unit being inserted in the recess in the reference direction,
the valve seat section includes:
a valve seat contact part which comes in contact with the main body in the reference direction; and
a valve seat load receiving part which receives load in the reference direction applied by the holder which comes in contact therewith, the holder applying the load to the valve seat section,
the holder includes:
a holder contact part which comes in contact with the valve seat load receiving part; and
a holder load receiving part which receives load in the reference direction applied by the main body to the holder, and
the deformed fixing part fixes the valve unit to the main body by applying the load in the reference direction to the holder.

2. The valve unit fixing structure according to claim 1 ,
wherein the valve seat section includes a substantially cylindrical valve seat inner wall surface which forms at least a part of an inner flow passage which is connected to the main body flow passage and through which the fluid passes,
the recess includes:
a recess inner wall surface that extends in parallel to the reference direction;
a flow passage opening that is a part in which the main body flow passage opens to the recess; and
a main body contact surface which extends from the flow passage opening to an end edge of the recess inner wall surface, the end edge being adjacent to the flow passage opening,
the valve seat contact part is in contact with the main body contact surface,
a range in which the valve seat contact part is projected onto a projection plane that is orthogonal to the reference direction is included in a range in which the main body contact surface is projected onto the projection plane, and
the valve seat contact part is formed in an annular shape that encloses the entire circumference of the flow passage opening.

3. The valve unit fixing structure according to claim 1 ,
wherein the holder includes a substantially cylindrical inner circumferential surface, and
the valve seat section includes a radial load receiving part which comes in contact with the inner circumferential surface and receives load applied to the valve seat section by the inner circumferential surface in a direction that is orthogonal to the reference direction.

4. The valve unit fixing structure according to claim 1 ,
wherein the at least a part of the range in which the valve seat contact part is projected onto a projection plane that is orthogonal to the reference direction is included in a range in which the valve seat load receiving part is projected onto the projection plane, and
a valve seat surface of the valve seat section that comes in contact with the valve body and the main body contact surface where the main body comes in contact with the valve seat contact part are both formed as the surfaces on planes that are substantially orthogonal to the reference direction.

5. A fluid pump including a pump main body having a compression chamber for drawing in a fluid, increasing the pressure of the fluid and then discharging the fluid, the pump main body being provided with a plurality of fluid valves, a high-pressure passage through which a fluid discharged from the compression chamber passes, and a discharge communication passage extending from the compression chamber to the high-pressure passage, and a valve unit fixing structure; wherein
the valve unit fixing structure comprises,
a main body,
a main body flow passage which is provided in the main body and through which a fluid passes,
a valve unit which is provided in the main body and which opens/closes the main body flow passage, and
a deformed fixing part which is formed by plastically deforming the main body and which fixes the valve unit to the main body;

the main body of the valve unit fixing structure constitutes the pump main body;
the main body flow passage of the valve unit fixing structure constitutes the discharge passage;
at least one of the fluid valves is a discharge valve provided in the discharge communication passage as a valve unit of the valve unit fixing structure;
at least another one of the fluid valves is a relief valve provided between the high-pressure passage and a space having a lower pressure than the high-pressure passage;
the discharge valve is fixed to the pump main body by the deformed fixing part of the valve unit fixing structure;
the deformed fixing part is evenly disposed about the discharge valve at a plurality of places in the circumferential direction; and
a non-deformed part, which is a part between the deformed fixing parts that are adjacent to each other in the pump main body, intersects, on the relief valve side than the discharge valve, with a valve placement direction plane which passes through the center of the discharge valve and the center of the relief valve and which is parallel to a direction in which the discharge communication passage extends.

6. The fluid pump according to claim 5 ,
wherein the pump main body is provided with a single recess which has a substantially cylindrical inner wall surface and which forms at least a part of the high-pressure passage, and
the discharge valve and the relief valve are inserted through the interior enclosed by the inner wall surface of the recess and fixed to the pump main body.

7. The fluid pump according to claim 5 ,
wherein the plurality of deformed fixing parts are plane-symmetrical, using the valve placement direction plane as the plane of symmetry, and
the non-deformed part intersects with the valve placement direction plane also on the opposite side than the discharge valve with respect to the relief valve.

8. The fluid pump according to claim 5 ,
wherein the pump main body is provided with a relief passage in communication with the low-pressure space from the high-pressure passage, and
the relief valve includes:
a valve body;
a valve seat member which is press-fitted into the relief passage and which collaborates with the valve body, and
a spring member which is inserted in the relief passage and compressed by press-fitting of the valve seat member and which urges the valve body toward the valve seat member.

Assignees

• Keihin Corp

Inventors

• Kaneko Yohei
• Ogane Yuya

Classifications

• F16K17/0406 Primary

  in the form of balls · CPC title

• F02M59/44

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F16K15/028 Primary

  the valve member consisting only of a predominantly disc-shaped flat element · CPC title

• F02M59/462

  Delivery valves · CPC title

• F16K25/00

  Details relating to contact between valve members and seats (movement of valve members other than for opening and closing F16K29/00) · CPC title