JPS62197688A - Rotary compressor - Google Patents

Abstract

PURPOSE:To improve the starting characteristic in warming operation by allowing an auxiliary heat exchanger which is connected with the outlet pipe of a sealed container and heat-exchanges with an accumulator to communicate to the discharge passage of the compression elements only on start. CONSTITUTION:An auxiliary heat exchanger 24 wound onto the outer wall of an accumulator 5 is connected to a discharge passage 21 through an outlet pipe 23 and a three-way selector valve 25. A piping 26 connected to one of the three-way selector valve 25 installed on the inlet side of the auxiliary heat exchanger 24 is opened to the space 27 in a sealed container 6. When the three- way selector valve 25 is switched to the auxiliary heat exchanger 24 side on start, the coolant compressed by a rotary compression element 9 heats the liquid coolant in the accumulator 5 by the auxiliary heat exchanger 24 part, and the coolant flows into a refrigeration cycle from the outlet pipe 23. Then, the cooling for the motor-driven elements 7 is suspended, and the starting characteristic of warming operation is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement of a rotary compressor with improved startup characteristics during heating operation.

(B) Prior Art A conventional rotary compressor is constructed as shown in, for example, Japanese Patent Laid-Open No. 59-217456. Here, a conventional example will be explained with reference to this publication. In Figure 4, 5
53 is a primary discharge side refrigerant pipe that directs the refrigerant compressed by the electric compressor main body 52 to the outside of the closed container 51;
The refrigerant is connected to the auxiliary heat exchanger 54 and introduced into the closed container 51 again through the refrigerant return pipe 55 . Then, the refrigerant gas exits the closed container 51 from the secondary discharge side refrigerant pipe 56, passes through the condenser 57, pressure reducing device 58, and evaporator 59, passes through the low pressure side return pipe 6o, enters the accumulator 61, and is inhaled by the compressor. The refrigerant returns directly to the electric compressor body 52 through the pipe 62 . The low-pressure return pipe 60 includes a low-pressure heat exchanger 63 that is in a heat exchange relationship with the auxiliary heat exchanger 54, and connects the inflow pipe 64 and the outflow pipe 65 to connection points 66 and 67 of the low-pressure return pipe 6o. This completes the formation of a bypass circuit. An on-off valve 68 that opens for a predetermined short time in synchronization with the startup of the rotary compressor 5o is installed in the inflow pipe 64, and an on-off valve 68 is also installed between the bypass circuit connection points 66 and 67 of the low-pressure side return pipe 6o. 69 are provided. The on-off valves 68 and 69 operate in opposite directions.

In this structure, for a short time after startup, the refrigerant compressed by the electric compressor main body 52 and guided to the auxiliary heat exchanger 54 heats the return refrigerant bypassed to the low pressure side heat exchanger 63, and the accumulator 61 This facilitates re-evaporation of the refrigerant within the rotary compressor 50 and prevents liquid refrigerant from returning to the rotary compressor 50.

(8) Problems to be Solved by the Invention However, the refrigerant that has been introduced into the auxiliary heat exchanger 54 and has completed heat exchange with the return refrigerant is passed through the refrigerant return pipe 55 to the airtight container 5.
1, the motor winding of the electric compressor main body 52 is cooled, and the temperature of the rotary compressor 50 does not rise easily after startup, causing problems such as poor start-up characteristics during heating operation.

In order to solve the above problems, this invention uses an auxiliary heat exchanger to increase the temperature of the refrigerant from the accumulator that is sucked into the rotary compressor. The refrigerant that has been heat exchanged in the heat exchanger is guided directly to the condenser to prevent the temperature of the electric element from rising.
The purpose is to improve the start-up characteristics during heating operation.

(d) Means for solving the problem This invention connects an auxiliary heat exchanger that is in a heat exchange relationship with the accumulator to the discharge side of the rotary compression element and the outlet pipe of the closed container. A switching valve is provided in the engine, and by switching this switching valve, the refrigerant compressed by the rotary compression element is guided to the auxiliary heat exchanger during startup, and the compressed refrigerant is guided to the electric element during operation.

(*) Effect This invention is configured as described above, so that the refrigerant that has been fully compressed by the rotary compression element is supplied to the auxiliary heat exchanger at the time of startup using the switching valve, and the refrigerant in the accumulator is heated and adiabatically compressed. In addition to raising the temperature of the refrigerant used in the rotary compressor, the self-heating of the electric element raises the temperature of the rotary compressor itself. The initial temperature is increased.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 to 3.

1 is a rotary compressor, 2 is a condenser, 3 is a pressure reducing device, 4 is an evaporator, and 5 is an accumulator, which are connected in sequence with piping to constitute a refrigeration cycle. The rotary compressor 1 includes an airtight container 6 with internal high pressure, an electric element 7 housed in the upper side of the airtight container, and a rotary compression element 9 housed in the lower side and driven by a rotating shaft 8 of the electric element. It consists of The electric element 7 includes a stator 11 having a winding 10 fixed to the inner wall of a closed container 6, and a rotor 1 inserted into the rotating shaft 8 through an air gap 12 inside the stator.
It consists of 3. The rotary compression element 9 is a cylinder 14
, a row 216 that rotates within the cylinder 14 by the eccentric portion 15 of the rotating shaft 8, an upper bearing portion 17 and a lower bearing portion 18 that close the opening of the cylinder 14, and a cup muffler 19 attached to each of the bearing portions. .20 and a discharge passage 2 bored in the cylinder 14 which communicates with the inside of this cup muffler.
1, and a suction passage 22 that communicates the low pressure side in the cylinder 14 with the accumulator 5. 23
is an outlet pipe attached to the earthen wall of the closed container 6. 24
is an auxiliary heat exchanger wrapped around the outer wall of the accumulator 5, and this auxiliary heat exchanger is connected to the discharge passage 21 and the outlet pipe 23. 25 is a three-way switching valve provided on the inlet side of the auxiliary heat exchanger 24, and a pipe 26 connected to one side of this switching valve connects to the space formed by the electric element 7 and the rotary compression element 9 in the closed container 6. It opens at 27.

In the rotary compressor configured in this way, the cylinder 1
The refrigerant flowing into the cup muffler 19, 20 is compressed by the rotation of the roller 16, and is discharged into the cup muffler 19, 20. The discharged refrigerant flows from the discharge passage 21 into the space 27 inside the closed container 6 through a pipe 26 connected to one side of the three-way switching valve 25. When the refrigerant that has flowed into this space passes through the air gap 12 of the electric element 7, it absorbs the heat of this electric element and is completely discharged from the outlet pipe 23 into the condenser 2. The refrigerant flowing into the condenser exchanges heat with the outside air, condenses and liquefies, and performs a heating effect. Then, the liquid refrigerant is depressurized by the pressure reducing device 3, vaporized by the evaporator 4, and passed through the accumulator 5 to the rotary compressor 1.
Return to

At startup when the three-way switching valve 25 is switched to the auxiliary heat exchanger 24 side, the refrigerant completely compressed by the rotary compression element 9 is transferred to the auxiliary heat exchanger 2.
It flows to 4. The refrigerant flowing into this auxiliary heat exchanger heats the refrigerant in the accumulator S, and the rotary compression element 9
This increases the temperature of the refrigerant sucked into the refrigerant and prevents the suction of liquid refrigerant. If the temperature of the refrigerant sucked into the cylinder 14 is high, the temperature of the compressed refrigerant will be high. Moreover, the refrigerant in the accumulator 5 and the refrigerant heat-exchanged in the auxiliary heat exchanger 24 flow from the outlet pipe 23 to the condenser 2 so as not to cool the electric element 7. Therefore, the temperature of the rotary compressor 1 rapidly rises due to the heat generated by the compression of the rotary compression element 9 and the heat generated by the electric element 7's self-heating. In this state, when the three-way switching valve 25 is switched to the piping 26 side, the refrigerant compressed by the rotary compression element 9 flows through the piping 26 and flows into the space 27 . When the refrigerant that has flowed into this space passes through the air gap 12 of the electric element 7, it absorbs the heat of the electric element 7, which generates heat to a high temperature, and is discharged to the condenser 2. For this reason, the temperature of the condenser 2 rises rapidly, so that the start-up characteristics during heating operation are improved.

(G) Effects of the Invention The rotary compressor of the present invention connects an auxiliary heat exchanger having a heat exchange relationship with the accumulator to the discharge side of the rotary compression element and the outlet pipe of the closed container. A switching valve is provided, and by switching this switching valve, the refrigerant compressed by the rotary compression element is guided to the auxiliary heat exchanger during startup, and the compressed refrigerant is guided to the electric element during operation, thereby preventing the temperature rise of the rotary compressor during startup. Since it is stopped, the start-up characteristics during heating operation can be improved. Moreover, since the accumulator is heated, liquid compression by the liquid refrigerant at the time of startup can be prevented.

[Brief explanation of drawings]

1150 to 3 show this invention, FIG. 1 is a thick refrigerant circuit diagram, FIG. 2 is a plan view of a rotary compressor, FIG. 3 is a sectional view of the rotary compressor, and FIG. 4 is a conventional example. It is a refrigeration circuit diagram shown. 1... Rotary compressor, 5... Accumulator,
6... Sealed container, 7... Electric element, 9... Rotary compression element, 23... Outlet pipe, 24... Auxiliary heat exchanger, 25... Three-way switching valve. Applicant Sanyo Electric Co., Ltd. and one other representative Patent attorney Shizuo Sano Figure 3 Figure 4

Claims (1)

[Claims] 1. An electric element and a rotary compression element are housed in a closed container equipped with an outlet pipe, an accumulator provided outside the closed container is connected to the suction side of the rotary compression element, and an auxiliary device in a heat exchange relationship is connected to the accumulator. In a rotary compressor equipped with a heat exchanger, the auxiliary heat exchanger is connected to the discharge side of the rotary compression element and the outlet pipe of the closed container, and a switching valve is provided on the discharge side of the rotary compression element, and the switching valve A rotary compressor characterized in that it is a valve that conducts refrigerant compressed by a rotary compression element to an auxiliary heat exchanger during startup, and switches the compressed refrigerant to an electric element during operation.