Expansion valve, and refrigeration cycle system using expansion valve

Patent metadata

Field	Value
Publication number	US-10401065-B2
Application number	US-201415508196-A
Country	US
Kind code	B2
Filing date	Oct 8, 2014
Priority date	Oct 8, 2014
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

Provided is an expansion valve, including: a case having a valve chamber formed therein; and a valve element arranged in the valve chamber. The case includes: a side wall portion to which a first pipe is connected; and an end wall portion to which a second pipe is connected. The end wall portion has a fluid communication hole to be opened and closed by the valve element. The fluid communication hole is formed so that the following expression is satisfied: L<λ/2, where L represents an axial length of the fluid communication hole, and λ represents a resonance wavelength.

First claim

The invention claimed is:

1. An expansion valve, comprising:
a case having a valve chamber formed therein; and
a valve element arranged in the valve chamber,
the case comprising:
a side wall portion to which a first pipe is connected; and
an end wall portion to which a second pipe is connected,

the end wall portion having a fluid communication hole to be opened and closed by the valve element,
the fluid communication hole is formed so that the following expression is satisfied:
L<λ/ 2,
where L represents an axial length of the fluid communication hole, and λ represents a resonance wavelength, and

wherein the fluid communication hole is formed so that the following expression is satisfied:
L+ 0.4× D<λ/ 2,

where D represents an inner diameter of the fluid communication hole.

2. The expansion valve according to claim 1 , wherein the fluid communication hole is formed so that the following expression is satisfied:
L+ 0.4× D< 5 mm.

3. The expansion valve according to claim 2 , wherein the fluid communication hole is formed so that the following expression is satisfied:
L≥D.

4. The expansion valve according to claim 1 , wherein the expansion valve is configured to receive refrigerant flowing into the valve chamber from the second pipe through the fluid communication hole and out of the valve chamber into the first pipe.

5. A refrigeration cycle system, comprising:
a compressor;
a heat-source heat exchanger;
an expansion valve; and
an indoor heat exchanger,
the expansion valve comprising the expansion valve according to claim 1 , which is provided in an indoor unit.

6. An expansion valve, comprising:
a case having a valve chamber formed therein; and
a valve element arranged in the valve chamber,
the case comprising:
a side wall portion to which a first pipe is connected; and
an end wall portion to which a second pipe is connected,

the end wall portion having a fluid communication hole to be opened and closed by the valve element, and
the fluid communication hole having a columnar shape with an axial length and an inner diameter satisfying a relationship as follows:
L+ 0.4× D<λ/ 2

where L represents the axial length of the fluid communication hole,
λ represents a resonance wavelength of the fluid communication hole, and
D represents the inner diameter of the fluid communication hole.

7. The expansion valve according to claim 6 , wherein the fluid communication hole is formed so that the following expression is satisfied:
L+ 0.4× D< 5 mm.

8. The expansion valve according to claim 7 , wherein the fluid communication hole is formed so that the following expression is satisfied:
L≥D.

9. The expansion valve according to claim 6 , wherein the expansion valve is configured to receive refrigerant flowing into the valve chamber from the second pipe through the fluid communication hole and out of the valve chamber into the first pipe.

10. A refrigeration cycle system, comprising:
a compressor;
a heat-source heat exchanger;
an expansion valve; and
an indoor heat exchanger,
the expansion valve comprising the expansion valve according to claim 6 , which is provided in an indoor unit.

Assignees

• Mitsubishi Electric Corp

Inventors

• Shimazu yusuke

Classifications

• F25B2500/12

  Sound · CPC title

• F16K47/04

  for decreasing pressure {or noise level}, the throttle being incorporated in the closure member · CPC title

• F25B41/06

  Mechanical Engineering · mapped topic

• F25B41/062 Primary

  Mechanical Engineering · mapped topic

• F25B41/38 Primary

  specially adapted for reversible cycles, e.g. bidirectional expansion restrictors · CPC title