JPS6233114Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fixed volume chamber type capacity adjustment device for a reciprocating compressor.

This type of conventional fixed volume chamber type capacity adjustment device is
In general, many fixed volume chambers, that is, so-called clearance pocket chambers that adjust the discharge volume of process gas, are of a single-chamber type, and even if they are of a multi-chamber type, the single-chamber type is simply replaced with two chambers. The system is pre-installed and only allows one-step capacity adjustment by opening or closing the pocket chamber in response to changes in process gas requirements, making it difficult to operate with a large amount of excess capacity bypassed to the suction line. As a result, not only is there a large loss in the power consumption of the compressor itself, but there is also the inconvenience that a large amount of operating force and time are required to open and close the pocket chamber.

If the process gas discharge capacity can be adjusted to constantly follow changes in the required amount, it will be possible to reduce the surplus capacity and save power consumption. To achieve this, it is necessary to install a variable displacement automatic capacity adjustment device. However, the disadvantages are that the device configuration is unnecessarily complicated, there are many failures, and above all, the price is high.

In view of this conventional situation, this invention consists of arranging a plurality of fixed volume chambers occupying predetermined positions on concentric circles and forming openings, each of which is controlled by the rotation angle of a rotary valve fitted inside. By opening and closing one or more fixed volume chambers in combination, it is possible to easily and quickly adjust the capacity in multiple stages.

Hereinafter, one embodiment of this invented device will be described in detail with reference to the accompanying drawings.

FIG. 1 is a half-cut sectional view of the apparatus of this embodiment, and FIGS. 2 a to 2 f are operational explanatory views that also serve as cross-sectional views of the arrangement.

In each of these figures, reference numeral 1 is a cylinder of a reciprocating compressor, 2 is a piston, and 3 is a cylinder cover. Inside this cylinder cover 3, a plurality of fixed volume chambers each having a different volume are formed by partition walls. 4,
5 and 6 are arranged, and openings 7, 8, and 9 for the respective chambers 4, 5, and 6 are formed at predetermined angular positions on the inner wall on concentric circles. In addition, 10 has an outer circumferential surface on the inner surface of the inner wall, which is precisely and slidably rotatable;
Furthermore, a rotary valve fitted with a seal ring 11 interposed therebetween allows the openings to be opened and closed over a predetermined angular range in which one or more of the openings 7, 8, and 9 can be selectively opened and closed in combination. 12 is formed. The valve shaft 13 of the rotary valve 10 is taken out to the outside via several seal rings 14 and a thrust ring 15 between the shaft bearing part of the cylinder cover 3, and the operating handle 16 is attached to the outside with a washer. 17, it is fixed on the shaft with a nut 18. In the figure, reference numeral 19 connects each of the chambers 4, 5, 6 through a gasket packing 20.
It is a lid that blocks the

Therefore, in this embodiment device, the operating handle 16
By operating the rotary valve 10, the openings 7, 8, 9 of each fixed volume chamber 4, 5, 6 are closed with respect to the cylinder chamber, or one or more of them can be selectively closed. They can be opened in combination, allowing for multi-step capacity adjustment. In this case, the operating rotation angle of the operating handle 16 is
For example, a pointer (not shown) or an angle display plate may be selected as a guide, and the thrust due to the gas pressure that the rotary valve 10 receives during this operation is determined by the intervening thrust ring 1 with a small coefficient of friction.
5, the load is applied to the shaft bearing portion of the cylinder cover 3, and the operating force thereof is sufficiently reduced.

Here, as shown in FIG. 2, examples of combinations of opening and closing based on the operating rotation angle include a state in which all chambers are closed (a in the same figure), a state in which only chamber 4 is opened (b in the same figure), A state in which only chamber 6 is open (c in the same figure), a state in which chambers 4 and 5 are opened in combination (d in the same figure), a state in which chambers 5 and 6 are opened in combination (e in the same figure), and a state in which chambers 4 and 5 are opened in combination (e in the same figure). , 6 in the open state (f in the same figure). Also, as can be inferred from this explanation, by making the volumes of each fixed volume chamber suitably different, or arranging more than one of the same volume, and opening and closing them in appropriate combinations, the result is This allows the discharge capacity of the compressor to be finely adjusted in multiple stages.

As detailed above, according to this invention, a plurality of fixed volume chambers with the same volume or different volumes are arranged, and each fixed volume chamber has an opening at a predetermined angular position on a concentric circle. In addition, a rotary valve having an opening over a predetermined angular range that can be opened and closed in combination by selecting one or more of them corresponding to each chamber opening is slidably fitted inside the concentric circle. By controlling the rotation angle of this rotary valve, one or more fixed volume chambers can be opened and closed in combination.
The capacity corresponding to the required amount of process gas can be easily and easily selected and adjusted, thereby reducing the excess capacity of the compressor and reducing the power consumption of the compressor.The structure is also simple. It has the advantage that it can be carried out easily and inexpensively, and can also be operated reliably, quickly, and easily.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view showing one embodiment of the invented device, and FIGS. 2 a to 2 f are operation explanatory views that also serve as arrangement cross-sections. 1... Cylinder, 2... Piston, 3... Cylinder cover, 4, 5, 6... Fixed volume chamber, 7, 8,
9... Opening of fixed volume chamber, 10... Rotary valve, 12... Opening of rotary valve, 13... Valve shaft, 15... Thrust ring, 16... Operation handle.

Claims (1)

[Scope of utility model registration request] A plurality of fixed volume chambers with the same volume or different volumes are arranged inside a cylinder cover, etc., and each chamber is formed with an opening at a predetermined angular position on a concentric circle. A rotary valve having an opening over an angular range that can be opened and closed is fitted in one or more of them in a selective combination corresponding to the opening of each chamber, and the rotary valve is slidably fitted. A fixed volume chamber type capacity adjustment device for a reciprocating compressor, characterized in that the discharge capacity can be adjusted by opening and closing one or more of the fixed volume chambers in combination through rotation angle control.