JPH0415993Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention mainly relates to a hermetic refrigerant compressor used in refrigeration equipment and air conditioning equipment.

[Conventional technology]

FIG. 4 and FIG. 5 are a vertical cross-sectional view and a cross-sectional view of a compression element portion of a conventionally used hermetic compressor whose capacity is improved by utilizing the inertial supercharging effect. 4 and 5, 1 is a closed container, 2 and 3 are an electric element and a compression element housed in the closed container 1, and 4 is a rotor 2 of the electric element 2.
a and the rolling piston 6 of the compression element 3, and the rolling piston 6 is fitted into the eccentric portion 5 of the rotating shaft 4. 7 is compression element 3
The cylinder 7 is fixed to the closed container 1, and the rolling piston 6 and this piston 6 are connected to each other.
A suction chamber 9 is provided, which is partitioned by a vane 8 provided at both sides. 11 is a suction muffler disposed outside the sealed container 1;
and the suction chamber 9 are connected to the suction hole 1 provided in the cylinder 7.
0 and a suction pipe 12 through a refrigerant flow path 13 . In the conventional hermetic refrigerant compressor configured as described above, the rotating shaft 4 is rotated by the electric element 2, and the rolling piston 6 fitted to the eccentric portion 5 of the rotating shaft 4 is rotated. According to the suction pipe 12,
Refrigerant gas is sucked into the suction chamber 9 inside the cylinder 7 through the suction hole 10 . At this time, inside the suction pipe 12,
A pulsating flow of refrigerant gas is generated depending on factors such as the length and inner diameter of the suction pipe 12 and the rotation speed of the rolling piston 6. Therefore, by optimizing the length and inner diameter of the suction pipe 12, the rolling piston 6
By increasing the pressure at the moment when 0 is shut off, the capacity can be improved by increasing the amount of refrigerant gas sucked into the suction chamber 9 due to the inertial supercharging effect without changing the compression element 3. .

[Problem that the invention attempts to solve]

A conventional hermetic refrigerant compressor that uses the inertial supercharging effect to improve its capacity is configured as described above, and has a long refrigerant flow path consisting of a suction pipe and a suction hole. Since the capacity point is set at a point, it is possible to improve the capacity compared to the hermetic refrigerant compressor with the short refrigerant flow path length using the same compression element, but there is a problem that the capacity cannot be controlled. It was hot. This idea solves the above problems and
The object of the present invention is to provide a hermetic refrigerant compressor whose capacity can be controlled in stages at a low cost without changing the compression element and suction muffler.

[Means to solve the problem]

The hermetic refrigerant compressor according to this invention is provided with a bypass loop that is connected at both ends to a flow path switching valve provided in the middle of the suction pipe between the suction muffler and the compression element, and is switched by the flow path switching valve. be.

[Effect]

In the hermetic refrigerant compressor of this invention, the length of the refrigerant flow path between the suction muffler and the compression element is changed by switching the flow path switching valve to open and close the bypass loop. A pulsating flow is generated depending on the length of the refrigerant flow path, and the capacity can be controlled in stages.Also, since the length of the refrigerant flow path is changed using a flow path switching valve, a seal etc. can be used separately. Since there is no need to change the compression element and the suction muffler, the capacity control mechanism can be inexpensively and reliably switched.

【Example】

Hereinafter, embodiments of this invention will be described with reference to the drawings. 1 to 3 show one embodiment thereof. In FIG. 1, 15 is a bypass loop, one end of which is connected to the outlet side of the suction muffler 11 and the other end connected to the suction hole 1 of the compression element 3.
A flow path switching valve 14 is installed in the middle of the suction pipe 12 connected to the
Both ends are connected via. The configuration of this embodiment other than the above is the same as that of the conventional example shown in FIGS. 4 and 5. In this embodiment configured as above, when the bypass loop 15 is used as shown in FIG. 2 by switching the flow path switching valve 14, the refrigerant gas is passed through the loop 15 and the suction pipe is compression element 3
The refrigerant flow path 13 becomes longer.
Furthermore, when the bypass loop 15 is closed by switching the flow path switching valve 14, the refrigerant gas passes through the suction pipe 12 without passing through the loop 15, and the refrigerant gas is sucked into the compression element 3. The coolant is guided to the chamber 9, and the coolant flow path 13 is shortened. Therefore, in this embodiment, the capacity can be controlled by using the long and short refrigerant flow paths having different lengths. In addition, in this invention, n different bypass loops are provided in the middle of the suction pipe via flow path switching valves, and the switching valves are switched by electrical signals from the air conditioning system to create bypass loops according to the load. With or without passing refrigerant gas through the
By guiding the refrigerant to the compression element, (n+1) refrigerant flow paths are formed, and by the pulsating flow in the suction pipe depending on the length of these refrigerant flow paths, the capacity can be controlled in (n+1) stages.

[Effect of the idea]

As explained above, according to this invention, the length of the refrigerant passage between the suction muffler and the compression element varies depending on the opening and closing of the bypass loop by switching the flow path switching valve. By switching the road switching valve, stepwise capacity control is possible.
Moreover, it is possible to simply add a bypass loop without changing the compression element or suction muffler.
The capacity control mechanism is simple and inexpensive, and has the advantage of providing a hermetic refrigerant compressor that operates reliably.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a hermetic refrigerant compressor according to an embodiment of the invention, FIGS. 2 and 3 are explanatory diagrams of the refrigerant flow path by opening and closing the bypass loop shown in FIG. 1, and FIG. FIG. 5 is a vertical cross-sectional view showing a conventional hermetic refrigerant compressor, and FIG. 5 is a cross-sectional view of the compression element. DESCRIPTION OF SYMBOLS 1...Airtight container, 2...Electric element, 3...Compression element, 9...Suction chamber, 10...Suction hole, 11...
Suction muffler, 12... Suction pipe, 13... Refrigerant channel, 14... Channel switching valve, 15... Bypass loop. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a hermetic refrigerant compressor, an electric element and a compression component connected by a rotating shaft are housed in a hermetic container, and refrigerant gas is sent to the compression element from a suction muffler arranged outside the hermetic container. A hermetic refrigerant compressor characterized by having a bypass loop connected at both ends to a flow path switching valve provided in the middle of a suction pipe between a suction muffler and a compression element, and switched by the flow path switching valve.