JPS6032996A - Rotary compressor - Google Patents

Abstract

PURPOSE:To ensure the performance of a slide member by furnishing a slide wall member which is movable and constitutes part of the inner wall of a cylinder part, a spring housed in a recess formed in said slide wall member, and a control port to control the back face pressure of the slide wall member. CONSTITUTION:In case a high pressure refrigerant is introduced into a control port 18 and, then, a slide wall member 14 has blocked the front face space 20 to provide full capacity operation, the front face of said slide wall member 14 is put in a state as in contact with that surface of an accommodation chamber 13 which is situated on the stepped part side, and little clearance is formed in the cylinder part 5. Therefore there is no significant drop of the efficiency owing to a compression volume control mechanism 12 during full capacity operation. Because at this time the compression chamber refrigerant pressure of the cylinder part 5 acts in the direction right across the slide direction of the slide wall member 14, installing the accommodation chamber 13 in a position with a large crank angle does not cause the slide wall member 14 being pushed back.

Description

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

Conventional structure and its problems Traditionally, as a structure for making the compression capacity of a rotary compressor variable, a structure was used in which the gas being compressed was bypassed to the suction side of the compressor from a bypass port opened in the middle of the cylinder. was. However, in this case, the diameter of the bypass port could not be made very large due to clearance volume, volume, etc. 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 coefficients.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and enables wide-ranging compression capacity control by obtaining a sufficient bypass flow rate and reducing the compression capacity control rate to approximately 50% or less. The purpose is to

Structure of the Invention In order to achieve this object, the present invention includes a cylindrical member and upper and lower bearing members provided to close the upper and lower end surfaces of the cylindrical member. In addition to providing a suction port and 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 provided in the sliding wall material. A compression capacity control mechanism is provided, which includes a concave portion, a spring housed in the convex portion, and a control boat that communicates with the storage chamber and controls the back pressure of the sliding wall material.

With this configuration, the sliding wall material can be slid in the storage chamber by the back pressure and spring force of the sliding wall material, and the compression capacity can be changed widely. This will be explained with reference to FIGS. 1 to 5, which show the following. In FIG. 1, reference numeral 1 denotes a rotary compressor, and inside thereof there is a cylinder section 6 formed by a cylindrical member 2, an upper bearing member 3, and a lower bearing member 4. As shown in FIG. Reference numerals 6 and 7 are an inlet port and a discharge port respectively open to the cylinder portion 6. 8 is a rolling piston which is a rotary compression mechanism; 9 is a partition vane that partitions the cylinder portion 6 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 provided in the storage chamber 13 and opened to the cylinder portion 6, a slide wall material 14 that is stored in this storage chamber 13 and constitutes a part of the cylinder portion 6, and recesses 15 and 1 provided in this slide wall material 14. ．． It is composed of an S-shaped spring 16 housed in the four parts 16, a lid plate 17 of the storage chamber 13, and a control boat 18 that controls the back pressure of the slide wall 14.

19 is a bypass port, and the sliding wall material 14 is a spring 16
The cylinder part 5 and the storage chamber 1 are pushed together as shown in FIG.
When the front space 2o of No. 3 communicates with the front space 20, this front space 20
It is provided inside the cylindrical portion side 2 at a position communicating with the bypass passage 21 . Next, the rotary compressor 1 includes a discharge pipe 22, a four-way valve 23, a utilization side heat exchanger 24, a pressure reducer 26, a heat source side heat exchanger 26, an accumulation rake 27,
A suction pipe 28 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 3°, and the bypass W31 is connected to the control port 18 via the first solenoid valve 3°.
The f-path path 21 and the upstream side of the accumulation lake 27 are connected. In addition, a bypass pipe 31 is connected between the control boat 18 and the first solenoid valve 30 via a high pressure relief pipe 33 via a second solenoid valve 32.

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, the stator 34 and the rotor 3
An electric motor consisting of 5 serves as a driving source. Lubricating oil 36 is stored at the bottom of the rotary compressor 1, and the lower bearing member 4
is almost immersed. Further, 37 is a boss portion of the lower bearing member 4. In FIG. 3, the lower bearing member 4 is made of sintered alloy.

38 is a lower bearing member mounting bolt hole, and 39 is a valve seat for the discharge valve 1o. A spring hole for fixing one end of the spring 16 is provided in the center of the side of the storage chamber 13 on the boss portion 37 side.

Further, the boss portion 37 has a notch 41 for escaping the lid plate 17 of the storage chamber 13. In FIG. 4, 42 is a concave portion of the slide wall material 14, 43 is a protrusion at one end of the spring 16, which is inserted into the spring hole 42, and 44 is a protrusion at the other end of the spring 16, which is inserted into the spring hole 4Q. .

The operation will be explained below using the second configuration. First, when the rotary compressor 1 is operated at full capacity during heating, the first solenoid valve 3o is opened, the second solenoid valve 32 is closed, and the rolling piston 8 is moved in the direction of arrow A. It is rotating. Therefore, since high pressure gas is led to the control boat 18 via the back pressure pipe 29, the sliding wall material 14 is
The front space 20 is closed by overcoming the force. At this time, the front surface of the sliding wall material 14 is still in contact with the surface of the stepped section of the storage chamber 13, leaving almost no clearance section in the cylinder section 5. At the same time, the bypass port 19 is blocked by the bottom surface of the sliding wall material 14 on the opposite side of the four parts 16, so that a large amount of the high-pressure refrigerant in the control port 18 and the compressed gas in the cylinder part 6 leak into the bypass pipe 31. Never. Therefore, in this case, the inlet 6 to 7 ring portion 6
Most of the refrigerant sucked into the interior is discharged through the discharge lower and the discharge valve 10 to the discharge pipe 22, and is then passed through the four-way valve 23, the user-side heat exchanger 24, the pressure reducer 25, and the heat source-side heat exchanger installed in the υ room. container 26, four-way valve 23, accumulator 27, suction pipe 2
After passing through 8, it is inhaled again through the suction port 6. At this time, the user-side heat exchanger 24 heats the room with high efficiency.

Next, when the indoor temperature rises to a predetermined value, the first solenoid valve 30 is closed by a temperature controller or the like, and at the same time (the second solenoid valve 32 is opened. Therefore, the high pressure gas in the control boat 18 is The slide wall material 14 is released from the relief pipe 33 to the bypass pipe 31. Therefore, the slide wall material 14 is pushed by the spring 16 and returns to the position shown in FIG. Along with
A portion of the bypass boat 19 is opened into this front space 20. At this time, a portion of the refrigerant gas in the cylinder portion 6 flows into the front space 2o during compression, and a portion of the refrigerant gas is bypassed from the bypass port 19 to the upstream side of the accumulator 27 via the bypass pipe 31. In this case, even if the opening area of the bypass port 19 is small, the front space 2
0 and the space volume of the recess 15 is one or more times the volume of the cylinder part 6, the pressure increase in the front space 20 is not large. Therefore, after the rolling piston 8 has passed through the storage chamber 13, the weight of the refrigerant gas in the compression chamber of the cylinder portion 6 is greatly reduced, and the amount of refrigerant discharged from the discharge pipe 22 is greatly reduced. As a result, the heating capacity of the user-side heat exchanger 24 becomes small, and becomes a capacity close to the heating load.

Note that when using refrigerant, 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. By switching the second electromagnetic valves 30 and 32, the sliding wall material 14 is moved, and the capacity of the rotary compressor 1 is changed to [1], making it possible to perform air conditioning corresponding to the heating and cooling load. Further, when the first solenoid valve 30 is opened and high-pressure refrigerant is introduced into the control boat 18, and the sliding wall 14 closes the front space 20 and reaches full capacity, the front part of the sliding wall 14 is retracted. It comes into contact with the surface of the chamber 13 on the stepped part side, and the cylinder part 6 hardly forms a clearance part. Therefore, there is almost no reduction in efficiency due to the compression capacity control mechanism 12 during full capacity exercise. Also, at this time, the refrigerant pressure in the compression chamber of the cylinder section 6 acts in a direction perpendicular to the sliding direction of the slide wall material 14, so even if the storage chamber 13 is provided at a position with a large crank angle, the slide wall material 14 will not be pushed back.

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 6. Therefore, the slight clearance volumes formed at the corners of both ends of the sliding wall material 14 do not open into the cylinder portion 6, and therefore do not affect performance. In addition, at this time, since both the side of the storage chamber 13 that opens at the cylinder part and the front part of the slide wall material 14 are flat, the sealing performance is high when these two come into contact, and it is easy to process. Furthermore, at this time, the sliding wall material 14 also serves as a valve for closing the bypass port 19 with its bottom surface, so there is no need to provide a separate bypass port valve.

Next, the first solenoid valve 3o is closed, and the second solenoid valve 32
is opened and the sliding wall material 14 is pushed back by the force of the spring 16, a large half-moon-shaped opening is created in the cylinder portion 6, and the front space 20. In addition, a large spatial volume is formed in the recess 16. Also, bypass port 19
- part is open. Therefore, until the rolling piston 8 passes through the half-moon-shaped opening, the refrigerant is not compressed very much in the high pressure chamber of the cylinder section 6, allowing for greater volume control and at the same time significantly reducing power consumption.

Furthermore, since the spring 16 is approximately S-shaped, the depth of the recess 15 can be made shallow, and as a result, the thickness of the flange portion of the lower bearing member 4 in which the storage chamber 13 is provided can be made small. Also, bypass port 19, nokuinokusu path 21, bypass pipe 3
1 is not necessarily necessary, and if the space volumes of the front space 20 and the recess 16 are sufficiently large, the performance during capacity control will not be greatly affected and the structure will be simple.

Effects of the Invention As is clear from the above embodiments, the rotary compressor of the present invention includes a cylinder portion formed of 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 opening to the cylinder part, and a discharge port are provided, and a movable sliding wall material forming a part of the inner wall of the cylinder part. , a storage chamber for storing the sliding wall material, a recess provided in the sliding wall material, a spring housed in the recess, and a control boat that communicates with the storage chamber and controls the back pressure of the sliding wall material. Since the compressor is equipped with a compression capacity control mechanism consisting of Therefore, there is no decrease in performance.

In addition, when reducing the compression capacity, by controlling the pressure on the control boat, the spring force can be used to restore the sliding wall material with a simple structure, and furthermore, this spring can be used to restore the sliding wall material to its original position. Since it is housed in the concave part of the material, the compression capacity control mechanism becomes compact, the spring ensures the movement of the sliding wall material, and the generation of vibration noise can be prevented because the sliding wall material is pressed. At this time, since the space volume opened in the cylinder part of the storage chamber is large, the rotary compression mechanism passes through the compression capacity control mechanism within the cylinder part, and almost no compression is performed, so a large compression capacity control rate can be obtained. be.

[Brief explanation of drawings]

Fig. 1 is a diagram of a refrigerant cycle in which a rotary compressor is installed, showing an embodiment of the present invention, Fig. 2 is a sectional view of the main parts of the rotary compressor, and Fig. 3 is a bottom view of the rotary compressor. FIG. 4 is a perspective view of a sliding wall material of the rotary compressor, and FIG. 6 is a perspective view of a spring of the rotary compressor. 1...Rotary compressor, 2...Cylindrical member,
3. Upper bearing member, 4; Lower bearing member, 6.
・・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, 16...
... recess, 16 ... spring, 18 ... control boat. Name of agent: Patent attorney Toshio Nakao and 1 other person
IrB

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 provided in the cylinder part, an inlet opening to the cylinder part, and a discharge port are provided, and a movable sliding wall material forming a part of the inner wall of the cylinder part. , a storage chamber for storing this sliding wall material, a recess provided in the sliding wall material, and a spring housed in the recessed portion of the storage chamber (C communicates with the control port to control the back pressure of the sliding wall material). A rotary compressor equipped with a compression capacity control mechanism consisting of: