JPS60184985A - Rotary compressor - Google Patents

Abstract

PURPOSE:To make compression capacity controllable into three stages with a large range, by connecting a cylinder opening space to be opened or closed by slide motion of a bypass controlling slide wall material, to a suction port via a valve gear. CONSTITUTION:Closing a first solenoid valve 30 and, after once opening a second solenoid valve 32, when it is opened at once, back pressure in a slide wall material 14 drops to some extent whereby the slide wall material moves by dint of a spring 16. In consequence, an empty space 20 making up a dead space is produced in a base position of the slide wall material so that compression capacity comes to be reduced. Next, when the second solenoid valve is opened, the said space 20 continuously comes to be interconnected to the upstream side of an accumulator 27 at the suction side whereby the compression capacity is yet more decreased in consequence.

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 eliminates the drawbacks of the prior art described in section 2 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 designed to close the upper and lower end surfaces of the cylindrical member, and a cylinder part provided within the cylinder part. A rotary compression mechanism, an inlet opening to the cylinder part, and a discharge port are provided, as well as a movable slide wall plate forming a part of the inner wall of the cylinder part and the slide wall material. a storage chamber for storing the storage chamber; a control port that communicates with the storage chamber and controls the back pressure applied to the slide wall material; and a front space of the storage chamber that communicates with the cylinder section when the slide wall material moves; A rotary compressor body comprising a bypass passage communicating with the front space and a check valve device provided in the bypass passage; and a rotary compressor body provided outside the rotary compressor body and communicating with the suction port. a suction pipe; a discharge pipe communicating with the discharge port;
a back pressure pipe that communicates the discharge pipe and the control port via a first electromagnetic valve; a bypass pipe that communicates the bypass passage and the suction pipe via a second electromagnetic valve; a high pressure relief pipe provided with a first check valve whose forward direction is from the middle of the first solenoid valve to the middle of the bypass path and the second solenoid valve; and the first solenoid valve. A high pressure introduction pipe is provided which connects the middle of the discharge pipe, and the middle of the control port and 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 reverse The compression capacity is controlled in three broad steps by opening and closing the stop 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. 6.7 is an inlet port and a discharge rotary opening in the cylinder portion 5, respectively. 8 is a rolling piston which 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 is a discharge valve; 11 is a spring for the partition vane; 12 is a compression capacity control mechanism; A storage chamber 13 is provided to penetrate through a part of the cylinder part 5 and open to the cylinder part 5; A slide wall material 14, a recess 15 provided on the lower surface side of the slide wall material 14, an oval spring 16 housed in the recess 15, and the storage chamber 1.
3, and a control port 18 for controlling the back pressure of the sliding 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 2o of the storage chamber 13 communicate with each other as shown in FIG. are doing.

Next, the rotary compressor main body 1 has a discharge pipe 22. four-way valve 23,
Utilization side heat exchanger 24. First pressure reducer 25° 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 port 18 and the first
A high pressure relief pipe 34 connects an intermediate point between the second solenoid 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 36 is provided which connects the middle of the solenoid valves 32 via a second pressure reducer 36. Further, 37 is a check valve device provided within the bypass path 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, 37 is a crankshaft, and an electric motor consisting of a stator 38 and a rotor 39 serves as a driving source. Lubricating oil 40 is stored at the bottom of the rotary compressor main body 1, and the lower bearing member 4 is substantially immersed therein. Further, 41 is a boss portion of the lower bearing member 4. Also, 42 is a check valve device 36
This is a port for In FIG. 3, 43 is a lower bearing member mounting bolt hole, and 44 is a valve seat for the discharge valve 1o. A spring hole 46 for fixing one end of the spring 16 is provided in the center of the contact surface 46 of the storage chamber 13 on the boss portion 41 side. The boss portion 41 also has an escape notch 47 for the cover plate 17 of the storage chamber 13. Further, the storage chamber 13 is provided with the lower bearing member 4.
It is provided so as to penetrate through the flange portion 48 of.

In FIG. 4, 49 is a spring hole provided on the side of the recess 16 of the slide wall material 14, and 6o is a slide surface in contact with the inner surface of the lid plate material 17. In FIG. 6, 61 is a protrusion at one end of the spring 16, which is inserted into the spring hole 46. Further, 52 is a protrusion at the other end of the spring 16 and is inserted into the spring hole 49. In FIG. 7, 63 is an outer frame, 64 is a second check valve, 55 is a valve seat, and 66 is a valve guide.

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 30 is opened and the second solenoid valve 3 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 led to the control boat 18 via the back pressure pipe 29, the slide wall material 1
4 overcomes the force of the spring 16 and closes the front space 20.

At this time, the front part of the sliding wall material 14 is
Due to the high pressure applied to the back surface of the storage chamber 13, the contact surface 4 of the storage chamber 13
5, leaving almost no clearance in the cylinder portion 5. Therefore, if the high-pressure refrigerant in the control boat 18 leaks into the seventh ring part 6 through the slide surface 50, a large amount of compressed gas in the ring part 5 will not leak into the bypass pipe 31, causing a decrease in efficiency. do not have. Also, in this case, the inside of the bypass passage 21 is under high pressure. Therefore, in this case, most of the refrigerant sucked into the cylinder part 3 from the suction port 6 passes through the discharge lower and the discharge valve 10 and then flows into the discharge pipe 22. from the four-way valve 23 to the user-side heat exchanger 24, pressure reducer 25, and heat source-side heat exchanger 2 installed indoors.
6. After passing through the four-way valve 23, the achievator 27, and the suction pipe 28, it is sucked in again from the suction port. At this time, the user-side heat exchanger 24 heats the room with high efficiency.Next, when the room temperature approaches the set value, the first solenoid valve 3o is closed by a temperature controller, etc., and the second solenoid valve 3o is closed. Valve 32 is once opened. Therefore, the high pressure gas in the control port 18 is released from the high pressure relief pipe 34 to the Ibus pipe 31. Therefore, the slide wall material 14 is pushed by the spring 16 and returns to the position shown in FIG. 1.Next, When the second solenoid valve 32 is closed, high pressure gas flows through the back pressure pipe 29 and the high pressure inlet pipe 36.
The second check valve 64 closes the valve seat 55 as shown in FIG. is maintained.

As a result, a front space 20 opening to the cylinder portion 5 and a space from the bypass port 19 to the boat 42 are formed. A part of the refrigerant gas in the high pressure chamber within the cylinder section 6 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 section 6 is reduced.
The amount of refrigerant discharged from the discharge pipe 22 is greatly reduced. As a result, the heating capacity of the heat exchanger 24 on the user side is a high-capacity 6
It has a medium ability of about 0chi.

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 is at low pressure, and the check valve 64 opens the valve seat 55.

Therefore, part of the refrigerant gas in the cylinder part 6 flows into the front space 2o during compression, and part of it flows from the bypass port 19 to the port 40. Check valve device 35. Bypass path 21, bypass pipe 31 and accumulator 27
bypassed to the upstream side. As a result, the weight of the refrigerant gas in the compression chamber of the cylinder section 5 after the rolling piston 8 has passed 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. decreases to rJr. Note that at this time, a part of the high pressure gas is transferred to the back pressure pipe 29.
It flows out to the bypass pipe 31 through the second pressure reducer 35° and the second solenoid valve 32. As a result, the heating capacity of the user-side heat exchanger 24 becomes a low capacity of 30 to 40% of the high capacity, which is balanced with the heating load and allows continuous heating.

Note that during cooling, the four-way valve 23 is simply switched, and the operation is similar to that during heating.

As described above, in this embodiment, the first. Second solenoid valve 3
By switching between 0 and 32 to move the sliding wall material and by opening and closing the check valve 64, 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. Further, when the first solenoid valve 30 is opened and high-pressure refrigerant is introduced into the control port 18 and the slide wall material 14 closes the front space 20 to reach full capacity, the slide wall member 1
The front part of the cylinder part 4 is in close contact with the abutment surface 45 of the storage chamber 13, so that a high sealing performance can be obtained, and the cylinder part 6 has almost no clearance part.

As a result, there is no reduction in efficiency due to the compression capacity control mechanism 12 during full capacity operation. Also, at this time, cylinder part 3
Since the refrigerant pressure in the compression chamber acts in a direction perpendicular to the sliding direction of the slide wall material 14, the slide wall material 14 will not be pushed back even if the storage chamber 13 is provided with a load having a large crank angle. 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 sliding wall material 14 do not open into the cylinder portion 3, and therefore do not affect performance. Also, at this time, storage room 13
Since both the zero abutment surface 45 and the front surface of the slide wall material 14 are flat, processing for achieving high sealing performance when these two abut are also easy. 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 check valve device 37 is surrounded by the outer frame 53 and is integrated, so that it can be easily incorporated into the bypass path 21. Also, since this check valve device 37 is located inside the rotary compressor main body 1, the front space 20° recess 16. And the total volume of the space from the bypass port 19 to the port 42 can be selected to an appropriate value. That is, even if the check valve device 37 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 is low. The ability will be reduced to almost the same level as the ability. This is because the effect of opening and closing the check valve 64 is small unless the total volume is 3A to 1 times the cylinder displacement or less.

Next, since the spring 16 has a substantially oval cross-sectional shape, the recess 15
As a result, the thickness of the flange portion 48 of the lower bearing member 40 in which the storage chamber 13 is provided can be reduced.

As described above, the rotary compressor of the present invention includes a cylinder portion formed by a cylindrical member, upper and lower bearing members provided to close the upper and lower end surfaces of the cylindrical member, and A rotary compression mechanism provided in the cylinder part, an inlet port opening into the cylinder part, and a discharge port, and a slide wall material that forms part of the inner wall of the cylinder part and is movably provided; A storage chamber that stores the sliding wall material, a control port that communicates with the storage chamber and controls the back pressure applied to the sliding wall material, and a front surface of the storage chamber that communicates with the cylinder part when the sliding wall material moves. A rotary compressor main body comprising a space, a bypass passage communicating with the front space, and a check valve device provided in the bypass passage; A suction pipe communicating with the mouth, a discharge pipe communicating with the discharge port, a back pressure pipe communicating the discharge pipe and the control port ζ via a first electromagnetic valve, and the bypass path and the suction pipe. A bypass pipe communicating via a second solenoid valve, and a second solenoid valve whose forward direction is from an intermediate point between the control boat and the first solenoid valve to an intermediate point between the bypass passage and the second solenoid valve.
A high pressure relief pipe provided with a check valve, an intermediate point between the first solenoid valve and the discharge pipe, and an intermediate point between the control boat and the second solenoid valve are connected via a second pressure reducer. Since the rotary compressor is equipped with a high pressure introduction pipe, it is possible to change the compression capacity of the rotary compressor in three stages over a wide range. Further, when the rotary compressor is operated at full capacity, when the slide wall material constitutes a part of the cylinder, no excess clearance volume is formed in the cylinder portion, so there is no deterioration in performance. Further, by controlling the opening and closing of only two solenoid valves, the first and second solenoid valves, on the outside of the rotary compression main body, 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 5 is a perspective view of the spring in Figure 1, Figure 6 is a perspective view of the lid plate, Figure 7 is the check valve. FIG. 3 is a side view of the device. 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...Sliding wall material ,
18... Control boat, 20. Front space, 21...
- Bypass path, 22 - discharge pipe, 28... suction pipe, 2
9.-back pressure pipe, 30-..first solenoid valve, 31.
- Bypass pipe, 32... Second solenoid valve, 33...
First check valve, 34... High pressure relief valve, 35...
-Second pressure reducer, 36...High pressure introduction pipe, 37-...
・Check valve device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4/ Figure 4 Figure 6 Figure 5 Figure 1-7

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 slide wall material that forms part of the inner wall of the cylinder portion and is movably provided, a storage chamber that stores the slide wall material, and a storage chamber that communicates with the storage chamber and the slide a control port for controlling back pressure applied to the wall material; a front space of the storage chamber that communicates with the cylinder section when the sliding wall material moves; and a bypass path that communicates with the front space;
a check valve device provided in the bypass passage; a suction pipe communicating with the suction port; and a discharge pipe communicating with the discharge port;
a back pressure pipe that communicates the discharge pipe and the control port via a first electromagnetic valve; a bypass pipe that communicates the bypass passage and the suction pipe via a second electromagnetic valve; A first solenoid valve whose forward direction is from the middle of the first solenoid valve to the middle of the bypass path and the second solenoid valve.
A high pressure relief pipe provided with a check valve, an intermediate point between the first solenoid valve and the discharge pipe, and an intermediate point between the bypass path and the second solenoid valve are connected via a second pressure reducer. Rotary type with high pressure introduction pipe