JPH0571670A - Expansion valve - Google Patents

Abstract

PURPOSE:To restrain the generation of refrigerant passage sounds caused by the turbulence of the refrigerant in an inlet chamber between a refrigerant inlet in a valve inserting chamber and a valve body. CONSTITUTION:An expansion valve 1 of a cassette type is composed of a housing 2 provided with a refrigerant inlet 4 allowing the inflow of refrigerant and a refrigerant outlet 5 allowing the outflow of the refrigerant and a valve body 3 inserted into a valve inserting chamber 8 of the housing 2. The valve body 3 partitions the interior of the valve inserting chamber 8 into an inlet chamber 12 communicating to the refrigerant inlet 4 and an outlet chamber 13 communicating to the refrigerant outlet 5. The valve body 3 is provided in the end with a chamber inlet 18 allowing the inflow of the refrigerant to reduce the pressure or the refrigerant flowing into from the chamber inlet 18 and introduced into an outlet chamber 13 and the refrigerant outlet 5. A filter 27 is provided between the refrigerant inlet 4 and valve body 3 in the valve inserting chamber 8. The flow of the refrigerant flowing into the inlet chamber 12 from the refrigerant inlet 4 is diffused, while dust included in the refrigerant flowing from the refrigerant inlet 4 into the valve body 3 is collectively caught.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion valve having a housing in which a valve body for decompressing a refrigerant is mounted.

[0002]

2. Description of the Related Art There is a cassette type expansion valve in which a housing is attached to a portion of a refrigerant evaporator of a refrigeration cycle into which a refrigerant flows, and a valve main body for depressurizing the refrigerant is mounted in a valve insertion chamber formed in the housing.

[0003]

In this cassette type expansion valve, a chamber (inlet chamber) is formed between the refrigerant inlet in the valve insertion chamber and the valve body. Therefore, the refrigerant flowing from the refrigerant inlet into the inlet chamber has a vortex flow in the inlet chamber or a distribution of different flow velocities, and the turbulence of the refrigerant flow is heard as a refrigerant passing sound.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an expansion valve which suppresses refrigerant passage noise.

[0005]

An expansion valve of the present invention comprises a refrigerant inlet for inflowing a refrigerant and a refrigerant outlet for outflowing the refrigerant, and a valve insertion chamber communicating with the refrigerant inlet and the refrigerant outlet is formed therein. A housing, a valve body mounted in the valve insertion chamber, decompressing the refrigerant that flows in from the refrigerant inlet and is guided to the refrigerant outlet, and a valve body disposed between the refrigerant inlet and the valve body in the valve insertion chamber. And a filter for collecting dust contained in the refrigerant flowing from the refrigerant inlet to the valve body.

[0006]

The refrigerant flows from the refrigerant inlet into the valve insertion chamber. The refrigerant flowing into the valve insertion chamber passes through the filter,
The flow of refrigerant diffuses. Then, the generation of vortex flow between the refrigerant inlet and the valve body in the valve insertion chamber and the distribution of different flow velocities are suppressed. Then, the refrigerant that has passed through the filter is decompressed by the valve body and flows out from the refrigerant outlet.

[0007]

As described above, the expansion valve of the present invention suppresses the generation of eddy currents and the distribution of different flow velocities between the refrigerant inlet in the valve insertion chamber and the valve body. As compared with the related art, it is possible to suppress the refrigerant passing noise due to the disturbance of the refrigerant flow.

[0008]

Next, an expansion valve of the present invention will be described based on an embodiment shown in the drawings. [Structure of Embodiment] FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional view of a cassette type expansion valve, FIG. 2 is a perspective view of a filter, and FIG. 3 is a plan view of the filter. .. The expansion valve 1 of this embodiment includes a housing 2 attached to a refrigerant evaporator (not shown) of a refrigeration cycle, and a valve body 3 arranged in the housing 2.

The housing 2 has a refrigerant inlet 4, which is connected to a liquid receiving container (not shown) through a refrigerant pipe (not shown), at a substantially opposite position on one side (downward in FIG. 1).
A refrigerant outlet 5 is formed which is directly connected to the refrigerant inlet of the refrigerant evaporator. Similarly, at the opposite position around the other side (upper side in FIG. 1) of the housing 2, the outflow refrigerant inlet 6, which is directly connected to the refrigerant outlet of the refrigerant evaporator, the refrigerant compressor (not shown) and the refrigerant pipe are provided. An outflow refrigerant outlet 7 is formed which is connected via the. Further, inside the housing 2, one end of the housing 2 (refrigerant inlet 6 for outflow, outlet side)
A valve insertion chamber 8 is formed which opens to the. The valve insertion chamber 8 is a hole into which the valve body 3 is inserted, and communicates with the refrigerant inlet 4, the refrigerant outlet 5, the outflow refrigerant inlet 6, and the outflow refrigerant outlet 7. A lid 9 is attached to the end of the valve insertion chamber 8 so that the refrigerant flowing inside the housing 2 can
To prevent it from leaking out.

The valve body 3 includes a valve body 11 which is inserted into the valve insertion chamber 8 and is pressed and fixed to the bottom of the valve insertion chamber 8 by a lid 9 and a press culm 10. The valve body 11 has an inside of the valve insertion chamber 8 that communicates with the refrigerant inlet 4, an inlet chamber 12 that communicates with the refrigerant outlet 5, an outlet refrigerant passage that communicates with the outflow refrigerant inlet 6 and the outflow refrigerant outlet 7. Room 1
It is provided so as to be divided into four. The valve body 11 in the inlet chamber 12 is formed with a cylindrical portion 17 for forming a valve chamber 16 in which the valve body 15 is arranged. This tubular part 1
At the end of 7, a chamber inlet 1 for guiding the refrigerant into the valve chamber 16 in the center is provided.
The stopper 19 having the number 8 is screwed in. In addition, according to the screwing amount, the spring 20 described below
It is provided to adjust the urging force of the. In addition, the valve body 11 is formed with a valve port 21 that allows the valve chamber 16 and the outlet chamber 13 to communicate with each other. A valve seat 22 is formed around the valve chamber 16 side of the valve opening 21.

A valve body 15 made of a metal sphere is arranged inside the valve chamber 16, and the valve body 15 is fixed to a valve receiving portion 23. The valve receiving portion 23 is provided such that the spring 20 biases the valve body 15 toward the valve seat 22.

Further, the valve body 3 is provided with a displacement means 24 for displacing the valve body 15 in accordance with the temperature and pressure of the refrigerant passing through the outlet refrigerant passage chamber 14. This transition means 24
Is provided on the outlet refrigerant passage chamber 14 side of the valve body 11,
A diaphragm 25 that expands and contracts according to the temperature and pressure of the refrigerant passing through the outlet refrigerant passage chamber 14, and the diaphragm 25.
And a transmission culm 26 for transmitting the expansion / contraction amount to the valve body 15.

On the other hand, in the inlet chamber 12, there is provided a filter 27 which covers the periphery of the tubular portion 17 and the cap side of the tubular portion 17 (see FIGS. 2 and 3). The filter 27 flows in from the refrigerant inlet 4 and enters the chamber inlet 18 of the valve body 3.
It collects dust contained in the refrigerant flowing in, and is composed of a frame body 28 mounted around the tubular portion 17, and a mesh 29 attached to the frame body 28 and having a relatively fine mesh. The mesh 29 is preferably provided separately from the tubular portion 17 and the stopper 19 and the inner wall of the valve insertion chamber 8.

The assembly of the expansion valve 1 will be briefly described.
The valve body 3 is inserted into the inside of the valve insertion chamber 8 of the housing 2 that has been machined, and the lid 9 is attached via the pressing culm 10. The filter 27 is placed in the valve insertion chamber 8 in advance,
Alternatively, it may be mounted around the tubular portion 17 of the valve body 3. Therefore, the conventional cassette type expansion valve 1
Even if the filter 27 is added, the assembly is not particularly complicated.

[Operation of Embodiment] Next, the operation of the above embodiment will be briefly described. With the refrigeration cycle activated,
The high-pressure liquid refrigerant cooled by the refrigerant condenser from the receiving container,
From the refrigerant inlet 4 of the housing 2 flows into the inlet chamber 12. The liquid refrigerant flowing from the refrigerant inlet 4 into the inlet chamber 12 passes through the filter 27 and is diffused relatively uniformly in the inlet chamber 12. As a result, the flow velocity distribution of the refrigerant in the inlet chamber 12 is made uniform, and the difference between the high-velocity portion and the low-velocity portion is reduced, so that the generation of swirl is suppressed. The refrigerant that has passed through the filter 27 flows into the valve body 3 through the chamber inlet 18, is decompressed between the valve body 15 and the valve seat 22, and flows into the refrigerant evaporator through the outlet chamber 13 and the refrigerant outlet 5. To do.

[Effects of Embodiment] The expansion valve 1 of this embodiment is
As shown in the above operation, the refrigerant inlet 4 in the valve insertion chamber 8
In the inlet chamber 12, which is between the valve body 3 and the valve body 3, the flow velocity distribution of the refrigerant is made uniform and the generation of the eddy current is suppressed. It can be kept low compared to the broken line B) in FIG. The alternate long and short dash line C indicates the sound of the refrigeration cycle other than the refrigerant passing sound of the expansion valve 1, such as the compressor and the blower. Further, by providing the filter 27 in the inlet chamber 12 which is between the refrigerant inlet 4 in the valve insertion chamber 8 and the valve body 3, the gas refrigerant is mixed with the liquid refrigerant in the expansion valve 1 when the refrigeration cycle is started. When the air bubbles flow in, the filter 27 diffuses the lumps of bubbles, so that the noise generated when the lumps of bubbles are depressurized in the valve body 3 can be suppressed. Further, when an independent liquid receiving container is integrated with the refrigerant condenser to improve the mountability to the vehicle and improve the space efficiency, the filter 27 which the conventional liquid receiving container has is installed in another place. However, by adopting the present invention, the filter 27 can be mounted on other than the liquid receiving container with almost no increase in cost.

[Modification] In the above embodiment, the refrigerant inlet,
Although the example in which the refrigerant outlet, the outflow refrigerant inlet, and the outflow refrigerant outlet are provided so as to intersect with the insertion direction of the valve body has been shown, any of them may be provided along the insertion direction of the valve body. Although an example in which the refrigerant outlet and the outflow refrigerant inlet are directly connected to the refrigerant evaporator has been shown,
You may connect with a refrigerant evaporator via a refrigerant pipe. Although the example in which the refrigerant that has passed through the refrigerant evaporator is passed through the housing and detected inside the housing has been shown, it may be provided so that the state of the refrigerant that has passed through the refrigerant evaporator can be detected at a place other than the housing. Further, depending on the purpose of use, the transition means for displacing the valve element in the state of the refrigerant having passed through the refrigerant evaporator may be omitted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cassette type expansion valve.

FIG. 2 is a perspective view of a filter.

FIG. 3 is a plan view of a filter.

FIG. 4 is a characteristic diagram in which frequency is plotted on the horizontal axis and sound pressure level is plotted on the vertical axis.

[Explanation of symbols]

 1 Expansion Valve 2 Housing 3 Valve Main Body 4 Refrigerant Inlet 5 Refrigerant Outlet 8 Valve Insertion Chamber 27 Filter

Claims (1)

[Claims] 1. A housing comprising: (a) a refrigerant inlet for inflowing a refrigerant; and a refrigerant outlet for outflowing a refrigerant, wherein a valve insertion chamber communicating with the refrigerant inlet and the refrigerant outlet is formed therein; A valve body mounted in the valve insertion chamber for reducing the pressure of the refrigerant that flows in from the refrigerant inlet and is guided to the refrigerant outlet; and (c) is arranged between the refrigerant inlet and the valve body in the valve insertion chamber. An expansion valve having a filter for collecting dust contained in the refrigerant flowing from the refrigerant inlet to the valve body.