JPS60184991A - Rotary compressor - Google Patents

Abstract

PURPOSE:To make compression capacity controllable into three stages with a large range, by making a dead space formable in a cylinder wall part with a slide wall material shifted, as well as interconnecting this dead space to the suction side. CONSTITUTION:Closing a first solenoid valve 30, when a second solenoid valve 32 is closed after being once opened, back pressure in a slide wall material 14 drops to some extent whereby the slide wall material moves by dint of a spring 16. As a result, an empty space 20 constituting a dead space is produced in a base position of the slide member, and compression capacity is thus decreased. Next, when the second solenoid valve is opened, the said space 20 comes to be interconnected to the upstream side of an accumulator 27 at the suction side in succession so that the compression capacity comes to be yet more reducible.

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.

Conventional Structures and Their Problems Conventionally, as a structure for widely varying the compression capacity of a rotary compressor, there has been a structure in which the rotation speed is controlled by converting the power frequency of the compressor drive motor. However, in this case, an expensive frequency conversion device is required, and if the rotational speed of the rotary compressor is changed widely, the reliability of the mechanical part is reduced.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and provides a simple structure for controlling the capacity of a rotary compressor over a wide range.

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 this cylindrical member, and a cylinder part formed within this cylinder part. A rotary compression mechanism, an inlet opening to the cylinder part, and a discharge port are provided, and a movable sliding wall material that forms part of the inner wall of the cylinder part and houses the sliding wall material. a rear space formed on the back side of the sliding wall material of the storage chamber;
a control hoard that communicates with the back space and controls the back pressure applied to the slide wall material; a front space of the storage chamber that communicates with the cylinder section when the slide wall material moves; and a control hood that communicates with the front space. A rotary compression system comprising a bypass port, a bypass path communicating with the bypass port, a spring-loaded check valve device provided in the bypass path, and a back pressure relief passage communicating the bypass port and the back space. A first electromagnetic valve connects the machine body, a suction pipe provided outside the rotary compressor body and communicating with the suction port, a discharge pipe communicating with the discharge port, and the discharge pipe and the control port. a back pressure pipe that communicates with the bypass passage through the suction pipe; a bypass pipe that communicates the bypass passage with the suction pipe via a second electromagnetic valve; and an intermediate portion between the first electromagnetic valve and the discharge pipe;
A high-pressure introduction pipe is provided that connects the bypass path and an intermediate point of the second electromagnetic valve via a second pressure reducer.

With this configuration, the sliding wall material is slid by the back pressure to open and close the front space, and when the front space is open, a spring is installed in the middle of the bypass path that communicates the front space with the suction pipe. The compression capacity is controlled in three broad stages by opening and closing the check valve device.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 7 showing one embodiment thereof.

In FIG. 1, reference numeral 1 denotes a rotary compressor main body, and inside thereof there is a cylinder portion 5 formed by a cylindrical member 2, an upper bearing member 3, and a lower bearing member 4. Reference numerals 6 and 7 indicate an inlet port and a discharge port TJ, respectively, which are open to the cylinder portion 5. 81-1: Rolling piston which is a rotary compression mechanism, 9 is a partition vane that partitions the cylinder part 6 into a high pressure chamber and a low pressure chamber, 1o is a discharge valve, 1
1 is a partition vane spring, 12 is a compression capacity control mechanism, which is provided through a part of the lower bearing member 4 and has a storage chamber 13 open to the cylinder section 6; The cylinder part 5
A slide wall material 14 that slides in a substantially radial direction, a recess 16 provided on the lower surface side of this slide wall material 14, an oval spring 16 housed in this recess 16, and a lid of the storage chamber 13. It is composed of a plate material 17 and a control port 18 for controlling the back pressure of the slide wall material 14.

19 is a bypass port, and the sliding wall material 14 is a spring 16
When the cylinder part 5 and the front space 20 of the storage chamber 13 communicate with each other as shown in FIG. ing.

Next, the rotary pressure path machine body 1 includes a discharge pipe 22, a four-way valve 23,
Usage side heat exchanger 24, first pressure reducer 26, heat source side heat exchanger 26, four-way valve 23, accumulator 27, suction pipe 2
8 is connected, and this suction pipe 28 is connected to the suction port 6. Also, a back pressure pipe 29 branched from the middle between the discharge pipe 22 and the four-way valve 23 is connected to the control port 18 via the first solenoid valve 30.
It is connected to the. Moreover, the bypass pipe 31 is the bypass pipe 2.
1 and the upstream side of the accumulator 27 are connected via a second solenoid valve 32. In addition, the control boat 18 and the first
A high-pressure relief pipe 34 connects an intermediate point between the second electromagnetic valve 32 and the bypass passage 21 via a first check valve 33. Also, between the first electromagnetic valve 30 and the discharge pipe 22, and between the bypass passage 21 and the second
A high pressure introduction pipe 35 is provided which connects the middle of the solenoid valves 32 to the middle of the solenoid valves 32 through a series circuit of a second pressure reducer 33 and a first check valve 34. Also, 33 is a bypass port 19 and a storage room 1.
This is a back pressure relief passage communicating with the back space 4o of No. 3, and is provided in the cylindrical member 2. Further, 34 is a spring-equipped check valve device provided within the bypass passage 21.

Next, in FIG. 2 and subsequent figures, parts that are the same as those in FIG. 1 are given the same numbers.

In FIG. 2, 35 is a crankshaft, and an electric motor consisting of a stator 36 and a rotor 37 serves as a driving source. Lubricating oil 38 is stored at the bottom of the rotary compressor main body 1, and the lower bearing member 4 is substantially immersed therein. Further, 39 is a boss portion of the lower bearing member 4. Further, 4o is a port for the spring check valve device 34, and 41 is a back space. In FIG. 3, 42 is a mounting bolt hole for the lower bearing member 4, and 43 is a valve seat for the discharge valve 1o. A spring hole 46 for fixing one end of the spring 16 to the center of the contact surface 44 on the boss portion 39 side of the storage chamber 13
is provided. Further, the boss portion 39 has an escape notch 46 for the cover plate 17 of the storage chamber 13. Further, the storage chamber 13 is provided to penetrate the flange portion 47 of the lower bearing member 4.

In FIG. 4, 48 is a spring hole provided on the side of the recess 16 of the sliding wall material 14, and 49 is a sliding surface in contact with the inner surface of the lid plate material 17. In Fig. 6, 6o is the spring 16
This is a protrusion at one end of the spring hole 48, which is inserted into the spring hole 48. Also, 5
1 is a protrusion at the other end of the spring 16 and is inserted into the spring hole 48.

In FIG. 7, 52 is an outer frame, 53 is a circular valve, 64 is a valve seat, 65 is a valve guide, and 66 is a coil spring for the circular valve 63.

Next, the operation of the above configuration will be explained.

First, when the rotary compressor main body 1 is operated at full capacity during heating, the first solenoid valve 3o is opened and the second solenoid valve 3o is opened.
2 is in a closed state and the rolling piston 8 is rotating in the direction of arrow A. Therefore, since high pressure gas is guided to the control port 18 via the back pressure pipe 29, the sliding wall material 1
4 overcomes the force of the spring 160 and closes the front space 2o.

At this time, the front part of the sliding wall material 14 is
Due to the high pressure applied to the back side of the storage chamber 130, the contact surface 4
4, leaving almost no clearance in the cylinder portion 5. Therefore, the high-pressure refrigerant in the control port 18 will not leak into the cylinder part S through the slide %i 49, nor will a large amount of compressed gas in the cylinder part 6 leak into the bypass pipe 31, resulting in a decrease in efficiency. . Further, in this case, the pressure inside the bypass passage 21 is high. Therefore, in this case, from the suction port 6 to the cylinder portion 3
Most of the refrigerant sucked into the chamber is discharged through the discharge lower and the discharge valve 10 to the discharge pipe 22, and is then transferred to the four-way valve 23, a user-side heat exchanger 24 installed in the chamber, a pressure reducer 26, and a heat source-side heat exchanger. container 26, four-way valve 23, accumulator 27, suction pipe 2
8, it is inhaled again from the inlet. At this time, the user-side heat exchanger 24 heats the room with high efficiency.

Next, when the indoor temperature approaches the set value, the first solenoid valve 30 is closed by a temperature controller or the like, and the second solenoid valve 32 is temporarily opened. Therefore, the high pressure gas in the control port 18 and the back space 41 is released through the back pressure relief passage 33, the bypass port 19, the spring-equipped check valve device 37, and the bypass passage 2.
1 is then released to the re-bypass pipe 31. Therefore, the sliding wall member 14 is pushed by the spring 16 and returns to the position as shown in FIG. Next, when the second electromagnetic valve 32 is closed, the compressed gas in the cylinder portion 5 pushes up the circular valve 53 from the front space 20 and the bypass port 19 and enters the bypass path. After that, when the pressure inside the bypass passage 21 becomes higher than the intruding gas pressure, the force of the coil spring 660 is also applied, and the circular valve 63 is moved against the valve seat 5.
4 is held closed. As a result, a front space 20 opened to the cylinder portion 5 and a space from the bypass port 19 to the port 42 are formed. A part of the refrigerant gas in the high pressure chamber within the cylinder section 5 flows into this space during compression, and after the rolling piston 8 passes through the storage chamber 13, it returns to the low pressure chamber within the cylinder section 5. 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 6 is reduced, and the amount of refrigerant discharged through the discharge pipe 22 is greatly reduced. As a result, the heating capacity of the heat exchanger 24 on the user side becomes a medium capacity of about 60% of the high capacity. Since the check valve 34 is provided, the high pressure inside the bypass passage 21 is maintained, and the medium capacity is maintained.

Next, when the indoor temperature further rises and reaches the set value, the second solenoid valve 32 is opened by the temperature controller, and the bypass path 2 is opened.
1 becomes low pressure, and the circular valve 63 opens the valve seat 54.

Therefore, part of the refrigerant gas in the cylinder part 5 flows into the front space 2o during compression, and part of the refrigerant gas flows from the bypass port 19 through the port 40 due to the spring force of the spring check valve device 34. The circular valve 53 is opened by overcoming the
1, it is bypassed to the upstream side of the accumulator 27 via the bypass pipe 31. As a result, the weight of the refrigerant gas in the compression chamber of the cylinder section 6 after the rolling piston 8 passes through the storage chamber 13 is further reduced than in the above-mentioned middle capacity, and the amount of refrigerant discharged from the discharge pipe 22 is large. ]. In addition, at this time, a part of the high pressure gas is transferred to the back pressure pipe 29, the second
The bypass pipe 3 passes through the pressure reducer 33 and the second solenoid valve 32.
Flows into 1. As a result, the heating capacity of the heat exchanger 24 on the user side becomes low, 30 to 40% of the high capacity, and in balance with the heating load, continuous heating is possible. Just by switching the valve 23, the operation is similar to that during heating.

As described above, in this embodiment, the first. Second solenoid valve 3
0.32 to move the sliding wall material, and by opening and closing the circular valve 53, the capacity of the rotary compressor can be changed widely, making it possible to perform air conditioning that corresponds to the heating and cooling load. In addition, the first electromagnetic valve 3o is opened and high-pressure refrigerant is introduced into the control port 18, and the slide wall material 14 closes the front space 20, achieving high sealing performance and forming almost a clearance part in the cylinder part 6. do not. As a result, there is almost no reduction in efficiency due to the compression capacity control mechanism 12 during full capacity operation. Also, at this time, the refrigerant pressure in the compression chamber of the cylinder section 3 acts in a direction perpendicular to the sliding direction of the slide wall material 14, so even if the storage chamber 13 is installed at a position with a large crank angle, the slide wall material 14 will not be pushed back. There's no chance of it happening.

Therefore, it is possible to freely design a desired capacity control rate, which is particularly effective when increasing the control rate.

Further, at this time, both ends of the side of the storage chamber 13 facing the cylinder section 5 are not exposed to the cylinder section 3. Therefore, the slight rearance volumes formed at the corners of both ends of the slide wall material 14 do not open into the cylinder portion 3, and therefore have a significant effect on performance. Also, at this time, storage room 130
Since both the abutting surface 44 and the front surface of the slide wall material 14 are flat, it is easy to process the two to provide a high sealing performance when they are still in contact with each other. Further, at this time, the slide wall material 14 also serves as a valve for closing the bypass port 19 by its bottom surface, and there is no need to provide a separate bypass port valve.

Next, the spring-equipped check valve device 34 is surrounded by the outer frame 62 and is integrated, so that it can be easily incorporated into the bypass path 21. Also, since this spring-equipped check valve device 34 is located inside the rotary compressor main body 1, the front space 20. The total volume of the recess 15 and the space from the bypass port 19 to the port 40 can be selected to an appropriate value. That is, even if the spring-equipped check valve device 34 is eliminated and a solenoid valve is provided near the bypass path 21 outside the rotary compressor main body 1, and the medium capacity and low capacity are switched by opening and closing this solenoid valve, the medium capacity remains the same. The ability will be reduced to almost the same level as the low ability.

This is the total volume above, and the cylinder displacement is 3A~
This is because unless it is 1 times or less, the effect of opening and closing the circular valve 63 will be small.

Next, since the spring 16 has a substantially oval cross-sectional shape, the recess 16
As a result, the thickness of the flange portion 47 of the lower bearing member 4 in which the storage chamber 13 is provided can be reduced.

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 so as to close the upper and lower end surfaces of the cylindrical member, and a rotary compressor provided within the cylinder portion. a rotary compression mechanism, a suction port and a discharge port opening into the cylinder section, a movable sliding wall material forming a part of the inner wall of the cylinder section, and the sliding wall material. a storage chamber for storing; a rear space formed on the back side of the sliding wall material of the storage chamber;
a control boat that communicates with this back space and controls the back pressure applied to the slide wall cavity; a front space of the storage chamber that communicates with the cylinder section when the slide wall material moves; Consisting of a communicating bypass port, a bypass path communicating with the bypass port, a spring-loaded check valve device provided in the bypass path, and a back pressure relief passage communicating the bypass port and the rear space. a rotary compressor main body, a suction pipe provided outside the rotary compressor main body and communicating with the suction port, a discharge pipe communicating with the discharge port, and the discharge pipe and the control port. a back pressure pipe communicating through a first solenoid valve; a bypass pipe communicating the bypass path and the suction pipe through a second solenoid valve; and an intermediate between the first solenoid valve and the discharge pipe. , a second solenoid valve between the bypass passage and the second solenoid valve
Since the rotary compressor is equipped with a high pressure introduction pipe connected via a pressure reducer, it is possible to change the compression capacity of the rotary compressor in three stages over a wide range. When operating at full capacity, when the slide wall material forms a part of the cylinder, no extra clearance volume is formed in the cylinder section, so there is no deterioration in performance. By controlling the opening and closing of only two second electromagnetic valves, three-stage control is possible, resulting in a simple system.

[Brief explanation of drawings]

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 shown in Fig. 1, and Fig. 3 is a diagram of the lower bearing shown in Fig. 1. Figure 4 is a perspective view of the sliding wall material in Figure 1, Figure 6 is a perspective view of the spring in Figure 1, Figure 6 is a perspective view of the flap plate material, Figure 7 is the spring. This is a sectional view of a check valve device equipped with a dragon.◇ 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 chamber, 14... Slide wall material, 18... Control boat, 20...
... Front space, 21 ... Bypass path, 22.
...Discharge pipe, 28...Suction pipe, 29...
...Back pressure pipe, 3Q...First solenoid valve, 31
...Bypass pipe, 32...Second solenoid valve, 33...Back pressure relief passage, 34...
・Spring-equipped check valve device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3, ? 9 Figure 4/7 Figure 7

Claims (1)

[Claims] 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, a rotary compression mechanism provided in the cylinder part, and an inlet opening to the cylinder part. , a discharge port, a movable sliding wall material forming a part of the inner wall of the cylinder portion, a storage chamber for storing the sliding wall material, and a storage chamber for storing the sliding wall material of the storage chamber. A back space formed on the back side, a control port that communicates with the back space and controls the back pressure applied to the slide wall material, and the storage chamber that communicates with the cylinder section when the slide wall material 1 moves. A rotary compressor main body comprising a front space, a bypass port communicating with the front space, and a back pressure relief passage communicating the back space with the inogu soot, and the rotary compressor main body. a suction pipe that is provided externally and communicates with the suction port, a discharge pipe that communicates with the discharge port, a back pressure pipe that communicates the discharge pipe and the control port via the first electromagnetic valve; a bypass pipe communicating the bypass passage and the suction pipe via a second solenoid valve; an intermediate position between the first solenoid valve and the discharge pipe; and an intermediate position between the bypass passage and the second solenoid valve. A rotary compressor equipped with a high pressure introduction pipe connected via a second pressure reducer.