JP3888490B2 - Pressure absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure absorber that is interposed in a fluid circuit and absorbs a rise in pressure, and more specifically, to a unit device that can be attached to and detached from a main body device, from the main device side through a quick disconnect joint. The present invention relates to a pressure absorber that prevents a pressure increase in a fluid circuit on a unit device side that becomes a closed circuit when separated in a configuration in which fluid is supplied and recovered to the side.
[0002]
[Prior art]
In a space station that is placed in an orbit around the earth and conducts various experiments, various experimental devices (unit devices) can be attached to and detached from the main body of the space base, allowing replacement and mutual compatibility of the experimental devices in the event of a failure. It is configured as follows.
[0003]
In these experimental devices, an incompressible fluid (liquid) such as a refrigerant for temperature control is supplied from the main body side, and the fluid passage circulates in the experimental device and returns to the main body device side. The fluid passage on the experimental device side and the fluid passage on the main device side are detachably coupled by a quick disconnect joint (quick disconnector so-called QD connector).
[0004]
In such a configuration, when the experimental device is separated from the main body device, the fluid passage becomes a closed circuit, but the quick detachable joint presses the fluid in the fluid passage when the internal poppet is operated at the time of detachment due to its structure, As a result, there is a problem that the pressure in the fluid passage serving as a closed circuit rapidly increases. Since the sudden rise in the pressure in the fluid passage may lead to the destruction of the pipelines and related equipment forming the fluid passage, some measures are required.
[0005]
Usually, in an incompressible fluid circuit, an accumulator is provided in the fluid circuit to absorb a sudden rise in pressure in the pipe line (for example, a surge pressure generated when the valve is suddenly closed).
[0006]
[Problems to be solved by the invention]
However, accumulators are complicated in structure and costly. In addition, the accumulator avoids the pressure rise in the fluid circuit by accommodating the incompressible fluid in the bellows whose volume is variable by elastic deformation, in order to expand the bellows against the elasticity of the bellows. The necessary pressure increase is inevitable. In addition, since the operation start pressure must be set so that it does not operate during normal use, a large capacity is required to suppress the pressure change to be small.
[0007]
The present invention has been made to solve the above-described problems, and can be made in a state that does not normally function with a simple configuration, and absorbs the pressure in the pipeline to minimize the pressure rise when necessary. It aims at providing the pressure absorber which can be suppressed.
[0008]
[Means for Solving the Problems]
A pressure absorber according to the present invention that achieves the above object is provided with a cylinder member having one end open and a connection passage to a fluid passage at the other end, and is movably inserted into the cylinder member with a predetermined stroke. The piston member is screwed to the open end of the cylinder member, and by adjusting the screwing position, the piston member can be immovably fixed to the connection passage side, and a predetermined volume space is formed on the connection passage side. And an adjustment member that can be moved as described above.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
1A and 1B show a conceptual configuration of an experimental apparatus 20 including a pressure absorber 10 according to an example of the present invention. FIG. 1A shows a state in which the apparatus is mounted on the main body device 50, and FIG. It is.
[0010]
The illustrated experimental apparatus 20 can be attached to and detached from the main body apparatus 50 of the space base by an engagement mechanism (not shown), and a circulation circuit 30 extending from the inlet 31 to the outlet 32 is formed therein, and this circulation circuit. 30 is supplied with a refrigerant which is an incompressible fluid from the main body device 50.
[0011]
A supply circuit 61 and a recovery circuit 62 are opened as a supply port 51 and a recovery port 52 at a site on the main body device 50 side where the experimental apparatus 20 is mounted.
[0012]
Corresponding CD connectors 41 (41A, 41B) and 42 (42A, 42B) are provided at the inlet 31 and the outlet 32 of the experimental apparatus 20, and the supply port 51 and the recovery port 52 of the main unit 50, respectively. The CD connector 41, 42 connects the supply port 51 of the main device 50 and the inlet 31 of the experimental device, and connects the outlet 32 of the experimental device and the recovery port 52 of the main device 50.
[0013]
Thus, in a state where the experimental apparatus 20 is mounted on the main body apparatus 50, the circulation circuit 30 is connected to the supply circuit 61 and the recovery circuit 62 of the main body apparatus 50, and the refrigerant supplied from the main body apparatus 50 passes through the inside of the experimental apparatus 20. When the experimental device 20 is separated from the main body device 50, the inlet 31 and the outlet 32 are closed by the action of the CD connectors 41 and 42, and the circulation circuit 30 becomes a closed circuit. .
[0014]
Here, the pressure absorber 10 is provided in the circulation circuit 30 via the branch path 33.
[0015]
As shown in an enlarged cross-sectional view in FIG. 2, the pressure absorber 10 has a connecting passage 11A formed at one end and an open end at the other end. The piston 12 is movably inserted, and an adjustment nut 13 as an adjustment member is provided at the open end of the cylinder 11.
[0016]
The cylinder 11 is fastened and fixed to the casing 21 of the experimental apparatus 20 via a mounting flange 11B that protrudes from the outer periphery of the cylinder 11, and the connection passage 11A is connected to the branch passage 33. A male screw 11C to which an adjusting screw 13 described later is screwed is formed on the outer periphery on the rear end (open end) side of the mounting flange 11B.
[0017]
The piston 12 is provided with O-rings 12A and 12B on its peripheral surface so as to be slidable while being pressed against the inner peripheral surface of the cylinder 11 while maintaining airtightness, and on the front end surface (end surface on the connection passage side). The seal member 12C is arranged in a circular shape centering on the connection passage 11A.
[0018]
The adjusting nut 13 has a cylindrical shape with one end closed, and an internal thread 13A is formed on the inner periphery thereof, and a pressing projection 13B that is loosely fitted to the cylinder 11 is provided inside the closed end. The female screw 13A is attached to the cylinder 11 by screwing with the male screw 11C of the cylinder 11, and the front end surface of the pressing projection 13B faces the rear end surface of the piston 12 with the washer 14 interposed therebetween. In the figure, reference numeral 13C denotes a wrench hole for rotating the adjustment nut 13.
[0019]
In FIG. 2, the adjustment nut 13 is tightened into the cylinder 11, the front end surface of the pressing projection 11 </ b> B of the adjustment nut 13 presses the piston 12 via the washer 14, and the front end surface of the piston 12 is the inner end of the cylinder 11. This is a state of being pressed against the wall surface, and this is an inactive state. When the adjustment nut 13 is loosened from this inactive state, the adjustment nut 13 is retracted as shown in FIG. 3, and the space between the front end surface of the pressing projection 13B and the rear end surface of the piston 12 is opened. The stroke is in an operable state in which the movement of the piston 12 is allowed.
[0020]
Thus, in the pressure absorber 10 configured as described above, the experimental device 20 is mounted on the main device 50 and the circulation circuit 30 is connected to the supply circuit 61 and the recovery circuit 62 of the main device 50 (experimental device). 20), the adjustment nut 13 shown in FIG. 2 is tightened, and the piston 12 is brought into an inoperable state incapable of moving. In this inoperative state, the piston 12 does not move even by the pressure of the refrigerant in the circulation circuit 30 acting via the branch path 33 and the connection path 11A (that is, the refrigerant pressure based on normal use), and the pressure absorber 10 has no function.
[0021]
When the experimental apparatus 20 is separated from the main body apparatus 50, the adjustment nut 13 is loosened to be in an operable state as shown in FIG. Thereby, the movement (retreat) of the piston 12 is allowed, and the refrigerant can flow into the cylinder 11 via the branch passage 33 and the connection passage 11A. That is, when the experimental apparatus 20 is separated from the main body apparatus 50, the inlet 31 and the outlet 32 are closed by the action of the CD connectors 41 and 42, and the circulation circuit 30 is closed. At this time, the poppet inside the CD connectors 41 and 42 is closed. 4, the refrigerant in the circulation circuit 30 is compressed. As shown in FIG. 4, the refrigerant flows into the cylinder 11 through the branch passage 33 and the connection passage 11 </ b> A, and moves the piston 12 backward, whereby the circulation circuit. The pressure rise in 30 can be suppressed. Here, the pressure in the circulation circuit 30 increases as much as necessary for the movement operation of the piston 12, which sets the mass of the piston 12 and the pressure receiving area so as to move with a pressure increase within an allowable range.
[0022]
When the experimental device 20 once separated is attached to the main body device 50 again, the circulation circuit 30 of the experimental device 20 is connected to the supply circuit 61 and the recovery circuit 62 of the main device 50, and then the pressure absorber 10 is connected. What is necessary is just to tighten the adjustment nut 13 and to make it an inactive state.
[0023]
【The invention's effect】
As described above, according to the pressure absorber according to the present invention, by adjusting the screwing position of the adjustment member screwed to the open end of the cylinder member, the piston member is fixed to the connection passage side so as not to move. Thus, a non-functional state that does not function normally can be achieved, and the piston member can be moved to the connection passage side to allow the fluid to flow in through the connection passage, thereby preventing an increase in pressure. That is, with a simple configuration, it can be in a state where it does not function normally, and when necessary, the pressure rise in the pipe line can be minimized.
[Brief description of the drawings]
FIG. 1 shows a conceptual configuration of an experimental apparatus equipped with a pressure absorber, which is an example of the configuration of the present invention, in which (A) is attached to the main unit, and (B) is separated from the main unit. It is.
FIG. 2 is an enlarged cross-sectional view of the pressure absorber in a non-operating state.
FIG. 3 is an enlarged sectional view of the pressure absorber in an operable state.
FIG. 4 is an enlarged cross-sectional view of the pressure absorber in the operating state.
[Explanation of symbols]
10 Pressure Absorber 11 Cylinder (Cylinder Member)
11A Connection passage 12 Piston (piston member)
13 Adjustment screw (Adjustment member)

Claims (1)

A cylinder member having one end opened and a connection passage to the fluid passage at the other end;
A piston member inserted inside the cylinder member so as to be movable at a predetermined stroke;
Screwed to the open end of the cylinder member, the piston member can be fixed to the connection passage side in an immovable manner by adjusting the screwing position, and can move so as to form a predetermined volume space on the connection passage side. And a pressure absorber characterized by comprising an adjustment member that can be formed.

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