JPS6161997A - Rotary compressor - Google Patents

Abstract

PURPOSE:To change the compressing capacity greatly as well as prevent drop in the efficiency by a compressing capacity control mechanism by moving a slide wall material, which constitutes part of the interior wall of the cylinder part and is capable of moving in the axial direction of cylinder. CONSTITUTION:To operate a rotary compressor 1 in full power for warming a room, a rolling piston 8 is rotated A in the condition that a solenoid valve 26 is open and another 28 is closed. High pressure gas is introduced to a control port 15 via a back pressure pipe 25, and the cylinder part 5 is shut from communication to a by-pass port 16 by the use of a slide wall material 14. As this slide wall material 14 is pressed to the cylinder part 5 at this time, no clearance will remain. Accordingly, major part of the refrigerant taken into the cylinder part 5 from a suction port 6 is discharged to a discharge port 7, discharge valve 10 and discharge pipe 18, and taken into the suction port 6 again from a four-way valve 19 after passing through a heat-exchanger on service side 20, a decompressor 21, a heat-exchanger on heat source side 22, the said four- way valve 19, an accumulator 23 and a suction pipe 24.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor, and particularly to a rotary compressor whose compression capacity is variable.

2 Page 1 Conventional structure and its problems Traditionally, as a structure for making the compression capacity of a rotary compressor variable, the gas being compressed is bypassed to the suction side of the compressor from a bypass port opened in the middle of the cylinder. A structure was in place.

However, in this case, the diameter of the bypass port could not be made very large due to the clearance volume when the port is closed. Therefore, the flow path resistance in the bypass port is large, and a sufficient bypass flow rate cannot be obtained, and as a result, the control rate of the compression capacity can only be reduced to about 60 to 70%.

In addition, as a structure for making the compression capacity of the rotary compressor variable, a storage chamber is provided in the bearing member, and a sliding wall material provided in the storage chamber is slid in the approximately radial direction of the cylinder section via a spring. Therefore, there are some structures that bypass the gas during compression to the suction side of the compressor, but in this case, the sliding direction of the sliding wall material is approximately the radial direction of the cylinder part, so the sliding wall material This has disadvantages such as the straw length is large and the storage chamber is accordingly large.

OBJECT OF THE INVENTION The present invention solves the drawbacks of the conventional technology as described in 1. By obtaining sufficient bypass flow control and reducing the control rate of compression capacity to about 50% or less, the present invention achieves precise compression capacity control. At the same time, the compression capacity control mechanism is made smaller, and
The aim is to improve reliability and prevent a reduction in efficiency due to the compression capacity control mechanism.

Structure of the Invention In order to achieve this object, the present invention provides a cylinder part formed by a cylindrical member and upper and lower bearing members provided so as to close the upper and lower end surfaces of the cylindrical member, and a suction tube opened to the cylinder part. a sliding wall material that is provided with an opening and a discharge port, constitutes a part of the inner wall of the cylinder section, and is movable in the axial direction of the cylinder section; and a control port that communicates with the storage chamber and controls the back pressure applied to the sliding wall material.

With this configuration, the sliding wall material can be slid by the back pressure, and the compression capacity can be greatly changed.
This prevents a reduction in efficiency due to the compression capacity control mechanism.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 4 showing one embodiment thereof.

In the figure, reference numeral 1 denotes a rotary compressor, and inside thereof there is a cylinder part 5 formed by a cylindrical member 2, an upper bearing member 3, and a lower bearing member 4. Reference numerals 6 and 7 are an inlet port and a discharge port respectively open to the cylinder portion 5.

8 is a rolling piston that is a rotary compression mechanism; 9 is a partition vane that partitions the cylinder portion 5 into a high pressure chamber and a low pressure chamber; 10
1 is a discharge valve, 11 is a partition vane spring, and 12 is a compression capacity control mechanism, which is provided in the lower bearing member 4 and has a storage chamber 13 that opens into the cylinder section 5; It also comprises a slide wall material 14 that slides in the axial direction of the cylinder portion 5, and a control port 15 that controls the back pressure of the slide wall material 14. 16 is a bypass port, a sliding wall material 14 is located at the bottom of the storage chamber, and the cylinder part 5 and the storage chamber 13
It is provided inside the cylindrical member 2 at a position that communicates with the storage chamber 13 when the two are in communication with each other, and communicates with the bypass passage 17.

The rotary compressor 1 with the above configuration includes a discharge pipe 18, a four-way valve 1
9. Utilization side heat exchanger 201 A pressure reducer 21, a heat source side heat exchanger 22, an accumulator 23, and a suction pipe 24 are connected, and this suction pipe 24 is connected to the suction port 6. Also, a back pressure pipe 25 branched from the middle between the discharge pipe 18 and the four-way valve 19 is the first
The control port 15 is connected to the control port 15 via a solenoid valve 26 . Further, the bypass pipe 27 connects the bypass path 17 and the upstream side of the accumulator 23. Also, control port 1
5 and the first solenoid valve 26 and the bypass pipe 27 are connected to the second solenoid valve 26.
A high pressure relief pipe 29 is connected to the high pressure relief pipe 29 via a solenoid valve 28 .

In FIG. 2, an electric motor consisting of a stator 30 and a rotor 31 serves as a driving source. Lubricating oil 32 is stored at the bottom of the rotary compressor 16, and the lower bearing member 4 is substantially immersed therein. Further, 33 is a boss of the lower bearing member 4. In FIG. 3, 34 is a lower bearing member mounting bolt hole, and 35 is a valve seat for the discharge valve 10. Further, in FIG. 4, numeral 36 indicates a sliding surface.

The operation of the above configuration will be explained next.

First, when the rotary compressor 1 is operated at full capacity during heating, the first solenoid valve 26 is opened and the second solenoid valve 28 is opened.
is closed, and the rolling piston 8 is rotating in the direction of arrow A. Therefore, since high pressure gas is guided to the control port 15 via the back pressure pipe 25, the sliding wall material 1
4 closes communication between the cylinder portion 5 and the bypass port 16.

At this time, the slide wall material 14 is pressed against the cylinder part 5 due to the high pressure applied to the back surface, and almost no clearance part is left in the cylinder part 5. Therefore, the high pressure refrigerant gas in the control port 15 is transferred to the slide surface 3G.
There is no leakage into the cylinder part 5 through the cylinder part 5, and there is no large amount of compressed gas inside the cylinder part 5.

Therefore, in this case, most of the refrigerant sucked into the cylinder part 5 from the suction port 6 passes through the discharge lower and the discharge valve 10, and is discharged to the discharge pipe 18. After passing through the side heat exchanger 20, pressure reducer 21, heat source side heat exchanger 22, four-way valve 19, accumulator 23, and suction pipe 24, it is sucked in again from the suction port. At this time, the user-side heat exchanger 20 heats the room with high efficiency.

Next, when the indoor temperature rises to a predetermined value, the first solenoid valve 26 is closed by a temperature controller or the like, and at the same time, the second solenoid valve 28 is opened. Therefore, the high pressure gas in the control port 15 is released from the high pressure relief pipe 29 to the rebypass pipe 27.

Therefore, the sliding wall material 14 returns to the lower part of the storage chamber 13,
The cylinder portion 5 and the bypass port 16 communicate with each other. At this time, a part of the refrigerant gas in the cylinder part 5 is in the middle of compression,
It is bypassed from the bypass port 16 to the second-stream side of the accumulator 23 via the bypass pipe 27. Therefore, after the rolling piston 8 passes through the storage chamber 13, the weight of the refrigerant gas in the compression chamber of the cylinder portion 5 is greatly reduced, and the amount of refrigerant discharged from the discharge pipe 18 is greatly reduced.

As a result, the heating capacity of the user-side heat exchanger 20 becomes small, and becomes a capacity close to the heating load.

Note that during cooling, the four-way valve 19 is simply switched, and the operation is similar to that during heating.

As described above, in this embodiment, the sliding wall material 14 is moved by switching the first and second solenoid valves 26 and 28, and the capacity of the rotary compressor is greatly changed to cope with the heating and cooling load. air conditioning is possible. Also, the first solenoid valve 26 is opened, high-pressure refrigerant is introduced into the control port 15, and the slide wall material 14 is connected to the cylinder portion 5 and the bypass port 16.
When the communication is closed and the full capacity is reached, the slide inner wall material 14 and the cylindrical member 2 are in close contact with each other, and a high sealing performance is obtained, and almost no clearance is formed in the cylinder portion 5. As a result, there is almost no reduction in efficiency when the compression capacity control mechanism 12 operates at full capacity.

Next, the first solenoid valve 26 is closed and the second solenoid valve 28 is closed.
When the sliding wall material 14 is returned to the lower part of the storage chamber 13 after being opened, a large half-moon-shaped opening is formed in the cylinder portion 5 and communicates with the bypass port 16. Therefore, until the rolling piston 8 passes through the semicircular opening, the refrigerant is not compressed very much in the high pressure chamber of the cylinder section 5, making it possible to achieve large capacity control and to significantly reduce power consumption. I can do it. Furthermore, since the sliding wall material 14 is moved in the axial direction of the cylinder portion 5, the moving stroke of the sliding wall material 14 can be made small, and the storage chamber can also be made small. Furthermore, movement of the sliding wall material is possible without using springs.

In this embodiment, springs are not used for the movement of the sliding wall material, but springs may be used to obtain more stable movement. Further, by using a spring, it is also possible to provide a compression capacity control mechanism in the upper bearing part.

10 b/ Effects of the Invention As described above, the rotary compressor of the present invention includes a cylinder portion formed by a cylindrical member, and upper and lower bearing members provided to close the upper and lower end surfaces of the cylindrical member; A rotary compression mechanism provided in the cylinder part, an inlet port and a discharge port opening in the cylinder part, and forming part of the inner wall of the cylinder part and movable in the axial direction of the cylinder part. A compression capacity control mechanism is provided that includes a sliding wall material, a storage chamber that stores the sliding wall material, and a control port that communicates with the storage chamber and controls the back pressure applied to the sliding wall material. Therefore, when the rotary compressor is operated at full capacity, when the slide wall material constitutes a part of the cylinder, no excess or rearance is formed in the cylinder portion, so there is no deterioration in performance. Further, when reducing the compression capacity, this can be easily done by controlling the pressure to the control port. Furthermore, since the space volume opened in the cylinder part of the storage chamber can be large, compression capacity control 11 is possible because the rotation compression mechanism does not perform compression until it passes through the mechanism. It is possible to obtain the rate.

Furthermore, since the moving direction of the sliding wall material is the axial direction of the cylinder portion, the moving stroke of the sliding wall material can be made smaller, and accordingly, the storage chamber can also be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a diagram of a refrigeration cycle equipped with a rotary compressor according to an embodiment of the present invention, Fig. 2 is a partial sectional view of the rotary compressor,
FIG. 3 is a perspective view of a lower bearing member in the same compressor, and FIG. 4 is a perspective view of a slide wall material in the same compressor. 1... Rotary compressor, 2... Cylindrical member, 3... Upper bearing member, 4... Lower bearing member, 5...・Cylinder part, 6... Suction port, 7... Discharge port, 8... Rolling piston (rotary compression mechanism), 12... Compression capacity control mechanism , 13...Storage room, 14...Sliding wall material, 18...Control port. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] a cylinder portion formed by a cylindrical member and upper and lower bearing members provided to close upper and lower end surfaces of the cylindrical member;
A rotary compression mechanism is provided in the cylinder part, an inlet port and a discharge port are provided that are open to the cylinder part, and the structure forms part of the inner wall of the cylinder part and is movable in the axial direction of the cylinder part. A rotation device equipped with a compression capacity control mechanism consisting of a freely sliding wall material, a storage chamber for storing the sliding wall material, and a control port that communicates with the storage chamber and controls the back pressure applied to the sliding wall material. type compressor.