# US 2019/0170411 A1 · Expansion valve

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- Number: US 2019/0170411 A1
- Document ID: US20190170411A1
- Status: Published application
- Kind: A1
- Application number: 16/322,960
- Filed: 2017-07-21
- Published: 2019-06-06
- Earliest claimed: 2016-08-09
- Assignees: Fujikoki Corporation; Denso Corporation
- Applicants: Fujikoki Corporation; Denso Corporation
- Inventors: Naoki KAMATA; Kinya OKUTSU; Takashi MOGI; Kurato YAMASAKI; Shigeki ITO
- Web page: https://patentgrep.com/patent/US20190170411A1

## CPC

- F25B 41/335: via diaphragms
- F16K 1/32: Details (details of more general applicability F16K25/00 - F16K51/00)
- F16K 31/002: {actuated by temperature variation (thermo-electric F16K31/025)}
- F25B 2341/06: Details of flow restrictors or expansion valves
- F25B 2341/063: Feed forward expansion valves
- F25B 2341/0683: the sensor is disposed in the suction line and influenced by the temperature or the pressure of the suction gas
- F25B 2500/12: Sound
- F25B 2500/13: Vibrations
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

An expansion valve is provided with a valve body including an inlet hole through which a refrigerant flows into a valve chamber, and a valve hole through which the refrigerant flows out of the valve chamber; a valve element configured to adjust an amount of the refrigerant flowing through the valve hole; a power element that is mounted to the valve body and configured to drive the valve element via a valve rod; a first vibration isolation spring provided in the valve chamber and configured to prevent vibration of the valve element; and a second vibration isolation spring that is in contact with the valve rod and configured to prevent vibration of the valve element.

## Claims

### Claim 1

An expansion valve comprising:
a valve body including an inlet hole through which a refrigerant flows into a valve chamber, and a valve hole through which the refrigerant flows out from the valve chamber;
a valve element configured to adjust an amount of the refrigerant flowing through the valve hole;
a support member configured to support the valve element;
a coil spring configured to press the valve element in a valve-closing direction via the support member;
a power element that is mounted to the valve body and configured to drive the valve element via a valve rod;
a first vibration isolation spring that is provided in the valve chamber and configured to prevent vibration of the valve element; and
a second vibration isolation spring that is in contact with the valve rod and configured to prevent vibration of the valve element,
wherein the first vibration isolation spring includes an annular base portion disposed between the support member and the coil spring, and a plurality of leg portions that extend radially from the annular base portion, and
each of the plurality of leg portions includes an upper portion radially formed in a same plane as the annular base portion, a bent portion that bends from the upper portion toward the coil spring, and a side portion extending downward from the bent portion.

### Claim 2 (depends on 1)

The expansion valve according to claim 1, wherein:
each of the plurality of leg portions of the first vibration isolation spring is in contact with a side wall surface of the valve chamber on a valve hole side of the inlet hole.

### Claim 3 (depends on 1)

The expansion valve according to claim 1,
wherein the upper portion is defined by a notch formed between the plurality of leg portions in a same plane as the annular base portion.

### Claim 4 (depends on 3)

The expansion valve according to claim 3,
wherein the notch has an arc-shape.

### Claim 5 (depends on 3)

The expansion valve according to claim 3,
wherein the notch has a substantially triangular shape.

### Claim 6 (depends on 1)

The expansion valve according to claim 1,
wherein the upper portion, the bent portion, and the side portion have a constant width in each of the plurality of leg portions.

### Claim 7 (depends on 1)

The expansion valve according to claim 1,
wherein each of the plurality of leg portions further includes a protruded portion provided near a lower end of the side portion; and
the protruded portion contacts the side wall surface of the valve chamber on a valve hole side of the inlet hole.

### Claim 8 (depends on 1)

The expansion valve according to claim 1,
wherein the plurality of leg portions further include connecting portions of leg portions that are adjacent in a same plane as the annular base portion.

### Claim 9 (depends on 1)

The expansion valve according to claim 1,
wherein the second vibration isolation spring includes a plurality of elastic pieces that are in contact with the valve rod.