JPH06193574A - Reversible rotation type compressor and reversible freezing cycle - Google Patents

Abstract

PURPOSE:To provide a rotary type compressor to perform compression of a refrigerant both in a forward and a reverse direction without mounting a valve mechanism in a closed container. CONSTITUTION:A reversible rotation type compressor comprises a cylinder 1; a rolling piston 2: and a slide vane 3. A space is formed between the outer peripheral surface of the rolling pistons 2 and the inner peripheral surface of the cylinder 1 with the slide vane 3 therebetween and closed with the rolling piston 2 when the rolling piston 2 is at a top dead center. Further, the compressor comprises two delivery and suction ports C and D which are fully opened when the piston is at a bottom dead center; side walls with which the two ends of the cylinder 1 are closed; and two refrigerant pipes 6 and 7 which are coupled to respective two delivery and suction ports C and D fully opened when the piston is at a bottom dead point and closed with the rolling piston 2 when the rolling piston 2 is at a top dead center and opened when it is at a bottom dead center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible rotary compressor in which the compressor itself can rotate in both forward and reverse directions, and a refrigeration cycle using the reversible rotary compressor which does not require a four-way valve. .

[0002]

2. Description of the Related Art FIG. 12 shows a conventional rotary compressor for a reversible refrigeration cycle disclosed in, for example, Japanese Patent Application Laid-Open No. 62-3196, in which 112 is a rotor of a motor and 107 is a rotor.
Is a rotating shaft, 118 is a valve mechanism, 114 is a main bearing, 116 is a cylinder, Pa is a first refrigerant pipe, 119a is a first suction hole, and 106 is a closed container.

Next, the operation will be described. In FIG. 12, the rotor 112 is controlled so that the rotating shaft 107 can rotate forward and backward. Further, in the valve mechanism 118, for example, the refrigerant gas sucked from the first refrigerant pipe Pa is passed through the valve mechanism 118 and the first suction hole 119a, which is a suction passage provided in the flange portion of the main bearing 114 and the cylinder 116, from the cylinder 119a. The gas is sucked into 116, compressed, discharged through the discharge hole, and discharged through the valve mechanism 118 to the second refrigerant pipe Pb.

In the reverse operation, the refrigerant gas sucked from the second refrigerant pipe Pb in the valve mechanism 118 is sucked into the cylinder 116 from the second suction hole through the valve mechanism 118, compressed, and discharged. It is discharged to the first refrigerant pipe Pa via the valve mechanism 118 via the hole 119a.

[0005]

Since the conventional rotary compressor for a reversible refrigeration cycle is constructed as described above,
A valve mechanism must be provided in the closed container 6, resulting in poor workability, high cost, and low reliability.

The present invention has been made to solve the above-mentioned problems, and has a simple structure without a valve mechanism, which has good workability, is inexpensive, has a cost-reducing effect, and is reliable. The objective is to obtain an improved reversible rotary compressor and a reversible refrigeration cycle.

[0007]

A reversible rotary compressor according to claim 1 is a rotary compressor having a cylinder, a rolling piston, and a slide vane, and an outer peripheral surface of the rolling piston sandwiching the slide vane. And an inner peripheral surface of the cylinder, two discharge ports that are closed by the rolling piston when the rolling piston is at top dead center and fully open when the rolling piston is at bottom dead center, and side walls that close both ends of the cylinder. At least one of the two refrigerant pipes is connected to the two discharge ports.

In the reversible rotary compressor according to a second aspect of the present invention, the two refrigerant pipes respectively connected to the two discharge / suction ports are provided on different side walls closing both ends of the cylinder.

In the reversible rotary compressor according to a third aspect of the present invention, two refrigerant pipes that are respectively connected to the two discharge ports are provided on both side walls that close both ends of the cylinder, and are connected to the same discharge port. Each of the refrigerant pipes is connected to one refrigerant pipe.

In the reversible refrigeration cycle of claim 4, the expansion mechanism is a capillary tube, and the reversible rotary compressor, the indoor heat exchanger, the capillary tube, the outdoor heat exchanger, and the reversible rotary compressor are directly connected by a refrigerant pipe. Then, the refrigeration cycle is configured.

In the reversible refrigeration cycle of claim 5, the motor for driving the reversible rotary compressor is composed of a three-phase motor, and the power input connection of this three-phase motor is a switch for switching two sets of three phases. This switch is provided so as to interlock with a switch for switching between cooling and heating.

According to a sixth aspect of the reversible refrigeration cycle, a switch for switching the power input connection of the three-phase motor for driving the reversible rotary compressor between two sets of three phases is provided, and this switch switches between cooling and heating. The configuration is such that it also serves as a switch.

[0013]

In the reversible rotary compressor according to the first aspect of the present invention, the refrigerant is compressed in both forward and reverse rotation directions without a valve mechanism.

A reversible rotary compressor according to a second aspect of the present invention has no valve mechanism and compresses the refrigerant in both forward and reverse rotation directions,
The refrigerant flows in from one side wall of the cylinder and is discharged from the other side wall of the cylinder.

A reversible rotary compressor according to a third aspect of the present invention has no valve mechanism and compresses the refrigerant in both forward and reverse rotation directions,
Also, the refrigerant flows in from both sidewalls of the cylinder and is discharged from both sidewalls of the cylinder.

In the reversible refrigeration cycle of claim 4, since the reversible rotary compressor can be rotated normally and reversely, it is possible to construct a heat pump device which does not require a four-way valve, and the reversible rotary compressor is an indoor heat exchanger. Also, since it is directly connected to the outdoor heat exchanger by the refrigerant pipe, the inflowing refrigerant is wetted and compressed.

According to a fifth aspect of the reversible refrigeration cycle, two sets of three-phase power input connections of the three-phase motor for driving the reversible rotary compressor in conjunction with a switch for switching between cooling and heating are switched, The reversible rotary compressor rotates forward and backward.

In the reversible refrigeration cycle of claim 6, the reversible rotary compressor is operated normally by the operation of the switch for switching the power supply input connection of the three-phase motor for rotating the reversible rotary compressor between two sets of three phases. Reverse rotation to switch between cooling and heating.

[0019]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a reversible rotary compressor showing an embodiment of the present invention. In this figure, 1 is a cylinder, 2 is a rolling piston, 3 is a slide vane, 4 is this slide vane 3, the rolling piston 2 2 is a crankshaft of the rolling piston 2 and C and D are symmetrically disposed between the inner peripheral surface of the cylinder 1 and the outer peripheral surface of the rolling piston 2 with the slide vane 3 interposed therebetween. Refrigerant pipe for supplying refrigerant to the discharge port C or discharging refrigerant from the discharge port C, 7 for supplying refrigerant to the discharge port D or discharging refrigerant from the discharge port D Is. The refrigerant pipes 6 and 7 are closed by the rolling piston when the rolling piston is at the top dead center and open when the rolling piston is at the bottom dead center.

FIG. 2 is a sectional view taken along the line II--II of FIG. 1. 8 is a side wall of the cylinder 1, and 7 is a refrigerant pipe for supplying the refrigerant to the discharge port D or discharging the refrigerant from the discharge port D.

FIG. 3 is an external perspective view of the reversible rotary compressor of the first embodiment. The refrigerant pipes 6 and 7 connected to the discharge ports C and D are provided only on one side wall 8 of the cylinder 1. .

FIG. 4 is a vertical cross-sectional view of a reversible rotary compressor and a motor assembled. In this drawing, 9 is a motor stator, 10 is a stator coil, 11 is a motor rotor, and 1 is a motor rotor.
2 is a motor cooling fan, 13 is a rotary shaft of a motor directly connected to the crankshaft 5, 14 is a muffler, 15,
Reference numeral 16 is a refrigerant pipe for supplying a refrigerant to the reversible rotary compressor through the muffler 14 and a motor or discharging the refrigerant from the reversible rotary compressor, and 17 is a closed container.

FIG. 5 is a sectional view of the reversible rotary compressor when the rolling piston 2 is located at the top dead center. Incidentally, FIG. 1 shows the time when the rolling piston 2 is located at the bottom dead center.

The operation of the first embodiment will be described below. In the reversible rotary compressor of FIG. 1, in the reversible rotary compressor including a cylinder 1, a rolling piston 2 and a slide vane 3, a rolling is provided between an inner peripheral surface of the cylinder 1 and an outer peripheral surface of the rolling piston 2. In a region that is closed when the piston 2 is located at the top dead center and opened when the rolling piston 2 is located at the bottom dead center, a symmetrical discharge port C and a discharge port D with the slide vane 3 interposed are provided. . Further, the refrigerant pipes 6 and 7 connected to the discharge port C and the discharge port D are provided only on one side wall 8 of the cylinder 1.

FIG. 6 is a detailed transition diagram of the suction process and the discharge process of the reversible rotary compressor shown in the first embodiment.

In this figure, the discharge port C functions as a suction port, and the discharge port D functions as a discharge port. In FIG. 6A, the refrigerant pipe 6 is closed by the rolling piston 2. Then, as the rolling piston 2 rotates, the refrigerant pipe 6 starts to be opened, and the refrigerant starts to be supplied to the discharge port C. When the rolling piston 2 further rotates and the rolling piston 2 reaches the bottom dead center (FIG. 6C), the refrigerant pipe 6 and the discharge port C are fully opened and the refrigerant is supplied to the discharge port C. When the rolling piston 2 further rotates, the refrigerant pipe 6 starts to be closed, and when the rolling piston 2 reaches the top dead center again, the refrigerant pipe 6 and the discharge port C are closed, and the suction process is completed. This state is shown in FIG.

When the rolling piston 2 shifts to the second rotation (FIG. 6 (f)), the slide vane 3 in the cylinder 1
The refrigerant on the opposite side of is started to be supplied to the discharge port D while being compressed, and the refrigerant pipe 7 starts to be opened, so that the refrigerant is discharged from the refrigerant pipe 7. The rolling piston 2 rotates further, and the rolling piston 2 reaches the bottom dead center (Fig. 6 (H)).
At this point, the refrigerant pipe 7 and the discharge port D are fully opened, and the refrigerant in the discharge port D is discharged from the refrigerant pipe 7. When the rolling piston 2 further rotates, the refrigerant pipe 7 starts to be closed, and when the rolling piston 2 reaches the top dead center again, the refrigerant pipe 7 and the discharge port D are closed, and the discharge process is completed. This state is shown in FIG.

At the same time when the refrigerant starts to be discharged from the refrigerant pipe 7, the refrigerant pipe 6 starts to be opened, the refrigerant is supplied to the discharge port C, and the suction process is started in parallel with the discharge process. This state is shown in FIG.

In this way, the discharge / suction ports C and D are continuously sucked / compressed with the slide vane 3 interposed therebetween, without communicating with each other. Further, since Example 1 is bilaterally symmetric, it is shown that the same function is achieved even when the reversible rotary compressor is rotated in the reverse direction. Further, in Embodiment 1, since the refrigerant tubes 6 and 7 are provided only on one side wall 8 of the cylinder 1, only one side wall 8 needs to be processed, and the number of processing steps is reduced.

Example 2. In the first embodiment, the discharge port C
The refrigerant pipes 6 and 7 connected to the cylinders 1 and D are cylinders 1
7, the refrigerant pipe 6 connected to the discharge port C is connected to one side wall 8 of the cylinder 1 and the refrigerant pipe 7 connected to the discharge port D is connected to one side wall 8 of the cylinder 1. It may be provided on the other side wall 8 of the cylinder 1. With this configuration, the refrigerant flows in one direction, so that the refrigerant can flow smoothly.

Example 3. FIG. 8 is an external perspective view of the reversible rotary compressor of the third embodiment. In the third embodiment, the refrigerant pipes 6 and 7 connected to the discharge ports C and D are connected from both side walls 8 of the cylinder 1, respectively. With this configuration, the refrigerant is supplied into the cylinder 1 evenly, the compression is smoothly performed, and the suction area is doubled, so that the suction pressure loss is reduced.

Example 4. FIG. 9 shows the reversible refrigeration cycle of the present invention. In this figure, 91 is the reversible rotary compressor shown in any of the first to third embodiments, 92 is an indoor heat exchanger,
Reference numeral 93 is an outdoor heat exchanger, and 94 is an expansion mechanism, which uses a capillary tube. In the fourth embodiment, the indoor heat exchanger 92 and the reversible rotary compressor 91, the outdoor heat exchanger 93 and the reversible rotary compressor 91 are directly connected by a refrigerant pipe, and no gas-liquid separator is provided.

In the figure, the solid line arrow indicates the flow of the refrigerant during the heating operation, and the broken line arrow indicates the flow of the refrigerant during the cooling operation. During the heating operation, the reversible rotary compressor 91 rotates as shown by the solid arrow, and sequentially circulates through the indoor heat exchanger 92, the expansion mechanism 94, and the outdoor heat exchanger 93, and returns to the reversible rotary compressor 91 again. During the cooling operation, the reversible rotary compressor 91 rotates in the reverse direction, and the refrigerant circulates as indicated by the broken line in the figure.

In the case of the conventional refrigeration cycle, the rotary compressor has a discharge valve, and this discharge valve is vulnerable to liquid compression, and the refrigerant sucked into the compressor (1) must be super-cooled as shown in the Mollier diagram of FIG. It had to be heat gas. On the other hand, in the fourth embodiment, since the reversible rotary compressor 91 does not have the discharge valve, the liquid may be compressed because there is no malfunctioning part.
As shown in the Mollier diagram of FIG. 10, the compressor suction refrigerant (1) may be wet. In other words, the capillary tube should be designed with less resistance than the conventional one.

As described above, the fourth embodiment can be operated even when the suction refrigerant of the reversible rotary compressor 91 is wet, the discharge temperature can be lowered, and the reliability of the equipment can be improved. Further, the specific volume of the sucked refrigerant is reduced, the refrigerant circulation amount, that is, the capacity is increased, and the efficiency is improved.

Example 5. FIG. 11 is a circuit diagram of a three-phase motor that rotates a reversible rotary compressor. 121 is a commercial power source,
122 is a current limiting inductor, and 123 is a commercial power supply 12.
1 is a full-wave rectifying circuit for full-wave rectifying DC, 124 is a smoothing circuit including a capacitor for smoothing the rectified DC,
A DC-AC inverter circuit 125 controls the frequency of the smoothed direct current into a three-phase alternating current having a phase change of 120 ° and controls the frequency according to the amount of heat load in the room. In one phase, there are two combinations of a transistor and a diode, which are provided for each phase.

The symbols a to l are DC-AC inverter circuits 125.
Phase control and frequency control signal input terminals, U,
V and W are output terminals of the inverter circuit 125, and three-phase alternating currents having different phases by 120 ° are output. Reference numeral 126 is a three-phase motor directly connected to the compressor, B, J, and R are input terminals of the three-phase motor, and 127 is an output 2 of the inverter circuit in conjunction with a switch (not shown) for switching between heating operation and cooling operation.
Connection between terminal and input 2 terminal of 3-phase motor, for example U-
3 by switching B, V-J to U-J, V-B
This is a switch for rotating the phase motor 126 in the forward and reverse directions.

Next, the operation will be described. The direct current of the commercial power source 121 rectified and smoothed by the full-wave rectifier circuit 123 and the smoothing circuit 124 is a DC-AC inverter circuit 125.
By controlling the on-off switching of the transistor, it is converted into a three-phase alternating current with a phase change of 120 °. This three-phase AC current drives the three-phase motor 126 to rotate the reversible rotary compressor.

In the DC-AC inverter circuit 125, a signal according to the heat load is input to the input terminals a to l, and the frequency is controlled by controlling the on / off switching of the transistors to control the three-phase motor 126. Control the number of rotations of the reversible rotary compressor.

Further, the switch 127 works in conjunction with a switch for switching between heating operation and cooling operation, and connects the output 2 terminal of the DC-AC inverter circuit 125 and the input 2 terminal of the three-phase motor, for example, UB and VJ. By switching to U-J and V-B, the three-phase motor 126 is normally and reversely rotated, and the reversible rotary compressor is normally and reversely rotated to switch the refrigeration cycle between heating operation and cooling operation.

Example 6. The switch for switching the connection between the output 2 terminal of the DC-AC inverter circuit 125 and the input 2 terminal of the three-phase motor 126 in the fifth embodiment rotates the three-phase motor 126 forward and backward to switch the refrigeration cycle between heating operation and cooling operation. It may also be used as a switch.

[0042]

The reversible rotary compressor according to claim 1 is a rotary compressor having a cylinder, a rolling piston, and a slide vane, wherein the outer peripheral surface of the rolling piston and the inside of the cylinder are sandwiched by the slide vane. It is provided between the peripheral surface and the rolling piston, which is closed by the rolling piston at the top dead center and is opened by the rolling piston at the bottom dead center. Since the two refrigerant pipes respectively connected to the discharge and suction ports are provided, the refrigerant can be compressed in both the forward and reverse rotation directions without the valve mechanism.

In the reversible rotary compressor of claim 2, the refrigerant pipe 6 connected to one discharge port is one side wall 5 of the cylinder 1, and the refrigerant pipe 6 connected to the other discharge port is the side wall of the cylinder 1. Since it is provided on the other side of 5, the refrigerant has the effect of flowing in from one side wall of the cylinder and being discharged from the other side wall of the cylinder, allowing the refrigerant to flow smoothly.

In the reversible rotary compressor of the third aspect, the refrigerant pipes 6 connected to the discharge ports C and D are cylinders 1 respectively.
Since it is connected from both side walls 5 of
Compresses the refrigerant in both forward and reverse rotation directions without a valve mechanism, and the refrigerant flows in from both sidewalls of the cylinder.
Discharge from both sidewalls of the cylinder. Therefore, the supply of the refrigerant into the cylinder 1 is performed evenly, the compression is smoothly performed, and the suction area is doubled, so that the suction pressure loss is reduced.

In the reversible refrigeration cycle of claim 4, the expansion mechanism is a capillary tube, and the reversible rotary compressor, the indoor heat exchanger, the capillary tube, the outdoor heat exchanger, and the reversible rotary compressor are directly connected by a refrigerant pipe. As a result, the compressor can be rotated in the forward and reverse directions, and a heat pump device that does not require a four-way valve can be configured, and the reversible rotary compressor can wet and compress the inflowing refrigerant, so the specific volume of the inhaling refrigerant is small. Therefore, the refrigerant circulation amount, that is, the capacity is increased, the discharge temperature is lowered, and the efficiency is improved.

In the reversible refrigeration cycle of the fifth aspect, the motor for driving the reversible rotary compressor is constituted by a three-phase motor, and the power input connection of this three-phase motor is a switch for interchanging two sets of three phases. Since this switch is configured to interlock with the switch that switches between cooling and heating, the switch can be switched between heating and cooling operations to rotate the motor forward and reverse, and to create a reversible rotary compressor. By rotating in the normal and reverse directions, the refrigeration cycle can be switched between the heating operation and the cooling operation.

In the reversible refrigeration cycle of the sixth aspect, the motor for rotating the reversible rotary compressor is composed of a three-phase motor, and the power input connection of the three-phase motor is a switch for exchanging two sets of three phases. Since this switch is provided and also serves as a switch for switching between cooling and heating, one switch is not required.

[Brief description of drawings]

FIG. 1 is a sectional view of a reversible rotary compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an external perspective view of the reversible rotary compressor according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of an assembled reversible rotary compressor and motor according to the first embodiment of the present invention.

FIG. 5 is a sectional view of the reversible rotary compressor when the rolling piston according to the first embodiment of the present invention is located at the top dead center.

FIG. 6 is a transition diagram of a suction process and a discharge process of the reversible rotary compressor according to the first embodiment of the present invention.

FIG. 7 is an external perspective view of a reversible rotary compressor according to a second embodiment of the present invention.

FIG. 8 is an external perspective view of a reversible rotary compressor according to a third embodiment of the present invention.

FIG. 9 is a circuit diagram of a reversible refrigeration cycle according to Embodiment 4 of the present invention.

FIG. 10 is a Mollier diagram of a reversible refrigeration cycle according to Example 4 of the present invention.

FIG. 11 is a circuit diagram of a three-phase motor in a reversible refrigeration cycle according to a fifth embodiment of the present invention.

FIG. 12 is a sectional view of a conventional reversible rotary compressor.

FIG. 13 is a Mollier diagram of a conventional refrigeration cycle.

[Explanation of symbols]

 1 cylinder 2 rolling piston 3 slide vane 5 crankshaft 6, 7 refrigerant pipe 8 cylinder side wall C discharge port D discharge port 91 reversible rotary compressor 92 indoor heat exchanger 93 outdoor heat exchanger 94 expansion mechanism 121 commercial power supply 122 current limitation Inductor 123 Full-wave rectifier circuit 124 Smoothing circuit 125 DC-AC inverter circuit 126 Three-phase motor 127 Changeover switch

Front page continuation (72) Inventor Tetsuya Mochizuki 3-18-1, Oga, Shizuoka City, Shizuoka Manufacturing Co., Ltd. (72) Yoshihiro Tanabe, 3-18-1, Oka, Shizuoka City Shizuoka Manufacturing Company, Ltd.

Claims (6)

[Claims] 1. A rotary compressor having a cylinder, a rolling piston, and a slide vane, wherein the rolling piston is formed between the outer peripheral surface of the rolling piston and the inner peripheral surface of the cylinder with the slide vane interposed therebetween. Is connected to the rolling piston at the time of top dead center and is fully opened at the time of bottom dead center, and the two discharge ports are connected to at least one of the side walls closing both ends of the cylinder. A reversible rotary compressor comprising: two refrigerant pipes which are closed by the rolling piston at the time of top dead center and open at the time of bottom dead center. 2. A rotary compressor having a cylinder, a rolling piston, and a slide vane, wherein the rolling piston is formed between the outer peripheral surface of the rolling piston and the inner peripheral surface of the cylinder with the slide vane interposed therebetween. Is closed by the rolling piston at the time of top dead center, two discharge ports that are fully opened at the time of bottom dead center, and one of the side walls that close both ends of the cylinder are connected to the one discharge port, and A refrigerant pipe that is connected to the other discharge port on the other side wall that closes both ends and that is closed by the rolling piston when the rolling piston is at top dead center and that is open at bottom dead center is provided. Characteristic reversible rotary compressor. 3. A rotary compressor having a cylinder, a rolling piston, and a slide vane, the rolling piston being formed between the outer peripheral surface of the rolling piston and the inner peripheral surface of the cylinder with the slide vane interposed therebetween. Is closed by the rolling piston at the time of top dead center, and is fully opened at the time of bottom dead center. Refrigerant pipes are respectively provided, and the refrigerant pipes are closed by the rolling pistons when the rolling pistons are at the top dead center, and are opened at the bottom dead center.
Further, the refrigerant pipes connected to the same discharge / suction port are connected to one refrigerant pipe, respectively. 4. The reversible rotary compressor according to claim 1, the indoor heat exchanger, the expansion mechanism, the outdoor heat exchanger, and the reversible rotary compressor are directly connected by a refrigerant pipe. A reversible refrigeration cycle characterized by comprising a refrigeration cycle, and the expansion mechanism is constituted by a capillary tube. 5. The drive motor of the reversible rotary compressor is 3
It consists of a three-phase motor, and the power input wiring of this three-phase motor
5. The reversible refrigerating cycle according to claim 4, wherein a switch for switching the connection of two sets of phases is provided, and the switch switching operation is interlocked with the switch for switching between cooling and heating. 6. The power supply input connection of the three-phase motor, wherein the switch for switching the connection of two sets of three phases is also used as a switch for switching between cooling and heating.
The reversible refrigeration cycle described.