JP2582600Y2 - Self-excited vibration suppression device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for suppressing self-excited vibration, and more particularly to controlling a downstream pressure of a liquid in a flow control valve, a pipe connection portion, etc. The present invention relates to a device for controlling self-excited vibration generated in a device for adjusting expansion and contraction of a pipe or the like by using the device.

[0002]

2. Description of the Related Art A technique for damping vibration in an expansion valve or the like has been known. For example, as a technique using a vibration damping piece, the vibration damping piece cooperates with the spring-side end face of the valve holder and includes an annular body that contains the refrigerant, and a plurality of pieces extending downward from this annular body while contacting the outer periphery of the spring. There is a technology in which the structure is a hanging piece (for example, see Japanese Utility Model Laid-Open No. 3-37372).

In the above technique, the vibration damping piece is merely placed in the main flow of the bellows, and it depends on the state quantity of the main flow (generally, the Strouhal number of 0.1 to 0.25) or the fold of the bellows. Due to the non-uniformity, a vortex is generated in the vicinity of the fold, and if it coincides with the natural frequency of the bellows system, it may lead to self-excited vibration. Once this phenomenon occurs, it generally cannot be stopped without changing the state of the mainstream, and requires technical measures to suppress it.

Conventionally, a countermeasure of this kind is to employ a feedback circuit (closed group) which constantly monitors the flow state of the fluid and changes the flow state when an abnormality occurs. Cost increases.

[0005] At the pipe connection part of the heat exchanger, when the heat medium is discharged into the pipe of the connection part, the heat medium which is a fluid at the connection part is caused by a sudden drop in pressure or the like. And vortices were generated. For this reason, a technique of devising the shape of the pipe connection is known (for example, see Japanese Patent Application Laid-Open No. 5-52449).

However, if the shape of the connection pipe is changed, the versatility of the connection pipe will be lost, and not only will the change of the conventional apparatus be affected, but also the common use of parts will be impaired.

An object of the present invention is to enable easy mounting without affecting the conventional device, to enable the common use of parts, to suppress the vortex itself, and to prevent self-excited vibration. An object of the present invention is to provide a self-excited vibration suppressing device.

[0008]

According to a first aspect of the present invention, there is provided a self-excited vibration suppressing device, comprising a vortex suppressing ring disposed upstream of a gas or liquid fluid of a device having a bellows. The ring has a bent portion whose outer end is bent in the bellows axial direction, and the bent portion is formed within 90 degrees downstream with respect to the bellows axial direction.

According to a second aspect of the present invention, there is provided a self-excited vibration suppressing device, which is a vortex suppressing ring disposed on an upstream side of a liquid fluid of a device having a bellows, wherein the vortex suppressing ring has a bellows shaft at an inner end. A bent portion bent in the direction, and the bent portion is formed within 90 degrees on the downstream side with respect to the bellows axial direction.

[0010]

The self-excited vibration suppressing device according to the first aspect of the present invention is a vortex suppressing ring disposed on the upstream side of the gas or liquid fluid of the device provided with the bellows, and the vortex suppressing ring is provided on the outer side. The end has a bent portion bent in the bellows axial direction, and the bent portion is 90 ° downstream with respect to the bellows axial direction.
When the main flow flows outside the bellows, the fluid flowing outside the bellows by the vortex suppression ring forms a boundary layer along the outline of the bent portion of the vortex suppression ring. , Suppresses the generation of vortices due to bellows folds.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 4 show an embodiment according to the first aspect of the present invention, in which a self-excited vibration suppressing device according to the present invention is used for a pressure regulating valve as a product having an active action. FIG. 1 is a plan view of a self-excited vibration suppressing device, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a case where the self-excited vibration suppressing device is used for a pressure regulating valve. FIG. 4 is a schematic sectional view of FIG.
FIG. 4 is an explanatory diagram of a refrigerant cycle using the pressure regulating valve of FIG. 3.

The self-excited vibration suppressing device S of the present embodiment is a vortex suppressing ring 10. As shown in FIGS. 1 and 2, the vortex suppressing ring 10 is an evaporator pressure regulator (hereinafter referred to as "EPR"). ) 20 bellows 21
A central hole 11 for attachment to the outer periphery of the
The outer end of the bellows 2 has a bent portion 13 bent from the upstream side to the downstream side of the flow of the fluid in the axial direction of the bellows 21. The bent portion 13 is formed with a curvature within 90 degrees with respect to the bellows 21 axis direction.

FIGS. 3 and 4 show an example in which the vortex suppression ring 10 is used for an EPR 20. FIG. As shown in FIG. 4, the EPR 20 is located between the evaporator 31 and the compressor 32 and functions to prevent frost by keeping the pressure of the evaporator 31 constant.

As shown in FIG. 3, the EPR 20 of this embodiment
It comprises a bellows 21, a spring 22, a ball 23, a needle 24, a valve seat 25, an adjusting screw 26, a spring 27, and a case 28, reference numeral 29 denotes a fluid inlet, reference numeral 30 denotes a fluid outlet, and an arrow X indicates This is the main flow direction of the fluid.

At the upstream end of the bellows 21, between the bellows 21 and the needle 24, the vortex suppression ring 10 as the self-excited vibration suppression device S is disposed. The EPR 20 shown in this example is merely an example, and can be applied to a known or well-known device other than the above. In other words, the self-excited vibration suppressing device S can be effectively applied to any device having a bellows. You can do it.

Next, the operation of the vortex suppression ring 10 will be described. Assuming that the main flow is flowing in the direction of arrow X in FIG. 3, the main flow X passes through the valve seat 25 and the needle 24 and Flow outside. At this time, the fluid flowing outside the bellows 21 by the vortex suppression ring 10 forms a boundary layer along the outline of the bent portion 13 of the vortex suppression ring 10, and generation of vortices due to the folds of the bellows 21 can be suppressed.

FIG. 5 is a partially cutaway explanatory view showing another embodiment. In this embodiment, an example in which a vortex suppressing ring 40 which is a device S for suppressing self-excited vibration is used in a pipe connection portion is shown. .

In the vortex suppressing ring 40 which is the self-excited vibration suppressing device S of the present embodiment, the example in which the bent portion 13 is formed at the outer end in the above embodiment is shown. The end 43 forms a bent portion 43 bent in the axial direction of the bellows 21 from the upstream side to the downstream side of the flow of the fluid.

That is, as shown in FIG.
When connected via the bellows 21, the vortex suppression ring 40 is located upstream of the connection portion in the main flow direction X of the fluid.
Connect through. And it arrange | positions so that the bending part 43 may be located inside the bellows 21. FIG. With the configuration as in this example, vortices generated between the connection pipes can be suppressed even at the pipe connection part.

[0021]

As described above, according to the present invention, simply using the vortex suppression ring allows easy mounting without affecting the conventional device, and commonalization of parts can be achieved. At the same time, self-excited vibration can be prevented by suppressing the vortex itself.

[Brief description of the drawings]

FIG. 1 is a plan view of a device for suppressing self-excited vibration according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic sectional view when the self-excited vibration suppressing device S is used for a pressure regulating valve.

FIG. 4 is an explanatory diagram of a refrigerant cycle using the pressure regulating valve of FIG.

FIG. 5 is a partially cutaway explanatory view showing another embodiment.

[Explanation of symbols]

 10, 40 Vortex suppression ring 11 Center hole 12 Outer periphery 13, 43 Bent portion 20 Evaporator pressure regulator (EPR) 21 Bellows 31 Evaporator 32 Compressor 22, 27 Spring 23 Ball 24 Needle 25 Valve seat 26 Adjustment screw 28 Case 29 Inlet 30 Outlet 41, 42 Piping S Self-excited vibration suppression device X Main flow direction

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Matsunaga 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (72) Inventor Takio Oya 2-27-2 Sakaiminamicho, Musashino-shi, Tokyo (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 55/04

Claims (2)

(57) [Scope of request for utility model registration] 1. A vortex suppression ring disposed upstream of a gas or liquid fluid of a device having a bellows, the vortex suppression ring having a bent portion whose outer end is bent in the bellows axial direction. The self-excited vibration suppressing device, wherein the bent portion is formed within 90 degrees on the downstream side with respect to the bellows axial direction. 2. A vortex suppression ring disposed upstream of a liquid fluid in a device having a bellows, the vortex suppression ring having a bent portion whose inner end is bent in the bellows axial direction. And the bent portion is located on the downstream side with respect to the bellows axial direction.
Suppression device of a self-excited vibration, characterized by comprising formed within 90 degrees.