JPH01219382A - Closed rotary compressor - Google Patents

Abstract

PURPOSE:To make improvements in a rise in internal temperature in a refrigerator and its starting characteristic to the yet more extent by having a gas inlet passage being interconnected to the inside of a cylinder bore of a compressor part, a check valve installed in the point midway in this passage and a volume built in a hermetically sealed case. CONSTITUTION:An electric motor part 3 and a compressor part 4 are housed in a hermetically sealed case 2. A check valve 21 is installed in the midway of a gas inlet passage being interconnected to the inside of a cylinder bore 5. A volume 19 is installed in the midway of the gas inlet passage lying between this check valve 21 and the cylinder bore 5. At the time of operation, the check valve opens an inlet hole 6, and gas in a compression space 5 is led to the outside of a compressor via a discharge hole 30, a discharge chamber 18 and a discharge pipe 29. At this time, the volume 19 serves as a resonance type silencer of a kind. Thus, a rise in internal temperature of a refrigerator and its starting characteristic are yet more improvable and thus a low noise comes to fruition.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hermetic rotary compressor used in refrigerators and the like.

(b) Conventional technology Conventionally, refrigerators equipped with this type of hermetic rotary compressor prevent high-temperature, high-pressure gas refrigerant from flowing back from inside the compressor to the cooler due to the pressure difference when the compressor is stopped. In order to prevent temperature rise, etc. and improve the starting characteristics during restart, a back check is installed on the low pressure side piping between the compressor and the cooler, as disclosed in Japanese Utility Model Publication No. 61-46367. While a valve is provided, a gas reservoir is provided in the piping between the check valve and the compressor.

(c) Problems to be Solved by the Invention However, according to the above configuration, the check valve and gas reservoir are attached to the refrigerant pipe outside the compressor by brazing, which not only increases the number of parts but also increases the Due to the limited space in the machine room, the piping structure becomes complicated and the installation work becomes complicated.

The present invention has been made in view of the above, and an object of the present invention is to provide a hermetic rotary compressor that can further improve the internal temperature rise and starting characteristics of a refrigerator without increasing the number of parts or complicating the installation work. With the goal.

(d) Means for Solving the Problems The present invention includes an electric motor section, a compressor section driven by the electric motor section, a gas suction passage provided to communicate with the cylinder pore of the compressor section, and a compressor section driven by the electric motor section. A check valve provided in the middle of the passage and a volume provided in the middle of the gas suction passage between the check valve and the cylinder bore are housed in a sealed case.

(*) Function The hermetic rotary compressor of the present invention has the above-described configuration, and the check valve provided in the gas suction passage simply prevents the backflow of high-temperature, high-pressure gas to the cooler when the compressor is stopped, thereby reducing the temperature inside the refrigerator. In addition to preventing pressure rise, the distance between the check valve and the cylinder bore can be significantly shortened to accelerate the pressure rise on the low pressure side when the compressor is stopped and shorten the pressure equilibration time between high and low pressures. , it is possible to restart the engine faster. Also,
The volume installed between the check valve and the cylinder bore makes it possible to maintain a pressure equilibrium state for a long time by supplying the gas within the volume to the cylinder bore until the compressor reaches a stable state upon restart. Characteristics can be improved.

Not only that, check valves and volumes are installed by making effective use of existing parts and space inside the sealed case, so it is difficult to make the compressor or machine room larger, increase the number of parts, or even increase the number of parts. Installation workability can be improved without complicating the piping structure.

(f) Example Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a hermetic rotary compressor which has a cylindrical airtight case 2, in which a motor part 3 is housed in the upper part and a rotary compressor part 4 driven by the motor part is housed in the lower part. The compressor section 4
The cylinder block 7 has a cylinder bore 5 and a suction hole 6 communicating with the bore, and an upper frame which has a compression chamber 8 formed by closing the bore of the block and a bearing portion 10° 11 for the rotating shaft 9. A body 12 and a lower frame body 13;
A roller 15 that is fitted onto the eccentric portion 14 of the rotating shaft 9 and rotates eccentrically within the compression chamber 8, and a vane 1 whose tip is always pressed against this roller to divide the inside of the compression chamber 8 into a high pressure side and a low pressure side.
It consists of 6. Reference numeral 17 designates a cup body that is fitted onto the upper frame body 12 and forms a discharge chamber 18 therein. Reference numeral 19 denotes a volume formed by closing a recess on the lower surface of the lower frame 13 with an end plate 20. The volume of this volume is set to about 4 to 5 times the discharge volume of the cylinder bore 5 for reasons described later. Reference numeral 21 denotes a check valve housed in the suction hole 6 of the cylinder block 7, which includes a valve body 23 that has a passage 22 on its outer periphery and moves within the suction hole 6 by gas pressure, and a valve formed on the end surface of the sleeve 24. It is composed of a seat 25.

26 is a strainer press-fitted into the suction hole 6;
Its lower end is used as a valve holder for the valve body 23.

Reference numeral 27 denotes a communication passage provided across both the cylinder block 7 and the lower frame 13 so that one end opens to the suction hole 6 between the check valve 21 and the cylinder bore 5, and the other end opens to the volume 19. It is a hole.

28 is a suction pipe, and 29 is a discharge pipe.

In the hermetic rotary compressor configured as described above, during operation, the check valve 21 opens the suction hole 6 as shown in FIG. After the gas introduced into the compression chamber 8 through the hole 6 is compressed within the chamber, the gas is discharged through the discharge hole 30 of the upper frame 12. Discharge chamber 18
, the internal space of the sealed case 2 and the discharge pipe 29 to the outside of the machine. At this time, the volume 19 serves as a kind of resonance muffler, and thus functions to reduce the pulsating noise of the intake gas. Furthermore, when the compressor is stopped, the high pressure gas remaining in the compression chamber 8 causes the check valve 2 to close as shown in FIG.
closes the suction hole 6, and high pressure gas does not flow back into the cooler. At this time, the volume 19 is filled with high pressure gas.

That is, according to the configuration of this embodiment, the check valve 21 provided in the suction hole 6 simply prevents the high-temperature, high-pressure gas from flowing back into the cooler when the compressor is stopped, thereby preventing the temperature inside the refrigerator from rising. In addition, the distance between the check valve and the cylinder bore 5 is significantly shortened to just a small volume of the suction hole 6, thereby reducing the pressure rise on the low pressure side when the compressor is stopped (roller in the compression chamber 8). 15 and the vane 16 (due to high pressure gas leaking from the seals, etc.) can be accelerated, the time required for the pressure to reach equilibrium between high and low pressures can be shortened, and startup at restart can be accelerated. In addition, the volume 19 provided between the check valve 21 and the cylinder bore 5 increases the volume between the check valve 21 and the cylinder bore 5, and although the above-mentioned effect of the rise characteristic is lost to some extent, the compression is reduced when restarting. By supplying the gas within the volume into the cylinder bore 5 until the machine reaches a stable state, the pressure equilibrium state can be maintained for a long time, and the starting characteristics at the time of restart can be improved. In addition, the check valve 21 and the volume 19 are arranged by effectively utilizing the existing parts of the compressor section 4 (for example, the sleeve 24 and the upper and lower frames 12 and 13) and the space inside the sealed case 2. Therefore, installation workability can be improved without enlarging the compressor or machine room, increasing the number of parts, or complicating the piping structure. Furthermore, since the volume 19 functions as a type of resonance muffler, it is possible to suppress the pulsation of the gas and reduce noise, and the low-temperature gas that circulates one after another can be directly fed into the cylinder bore 5. Since it has no significant effect on the amount of intake gas, it does not cause a reduction in performance.

Note that if the volume 19 is too large, the time required for pressure equilibrium will be delayed, and if it is too small, it will not be possible to maintain the pressure equilibrium state for a long time at the time of restart. ~5 times is better.

Further, FIGS. 6 to 10 show other embodiments, and FIGS. 6 to 8 show one in which the check valve 32 is composed of a ball valve 30 and a cylindrical valve holder 31, and FIGS. Figure 10 shows a cylinder block 34 using the volume 33 as a separate resonance muffler.
The communication pipe 35 is connected to the suction hole 38 between the check valve 36 and the cylinder bore 37, and these are all shown in FIGS. 1 to 5. This embodiment has the same effect as the embodiment described above.

(G) Effects of the Invention As described above, according to the present invention, it is possible to further improve the internal temperature rise and starting characteristics of the refrigerator without increasing the number of parts or complicating the installation work. , it is possible to provide a low-noise compressor.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a hermetic rotary compressor showing an embodiment of the present invention, Fig. 2 is a sectional view taken along section A-A in Fig. 1, and Figs. 3 and 4 are check valves. 5 is a sectional view taken along the line B-B in FIG. 3, FIGS. 6 to 10 show other embodiments, and FIGS. 6 and 7 are sectional views of the reverse valve. , FIG. 8 is a sectional view taken along the line C-C in FIG. 6, and FIG.
The figure is a vertical sectional view of the main part of a hermetic rotary compressor, and Figure 10 is a
FIG. 3 is a cross-sectional view taken along section D-D in the figure. 2... Sealed case, 3... Electric motor section, 4...
Compressor section, 5... Cylinder bore, 6... Suction hole, 7... Cylinder block, 19.33...
・Volume, 21, 32. 36...Check valve,
27...Communication hole.

Claims (1)

[Claims] (1) An electric motor section, a compressor section driven by the electric motor section, a gas suction passage provided to communicate with the cylinder bore of this compressor section, and a check valve provided in the middle of this passage. and a volume provided in the middle of a gas suction passage between the check valve and the cylinder bore, which are housed in a sealed case.