JPS6258091A - Rotary compressor - Google Patents

Abstract

PURPOSE:To facilitate assembling of a rotary compressor having a suction valve by setting the length of a coil spring in a check valve arranged between a suction tube and a compression chamber shorter than the depth of the tubular spring holding section of cylinder. CONSTITUTION:A tubular spring holding section 28 also serves as a suction path is formed in the cylinder 5 while a coil spring 26 of a suction valve is arranged in said spring holding section 28. One end of a coil spring 26 abutted on the wall face of a main bearing 6 while the other end is abutted on a reed valve body 25 corresponding with the opening of a suction tube 13 fitted to a sub-bearing 7. Since the length of the coil spring 26 is set shorter than the depth of the spring holding section 28, the coil spring 26 and a reed valve body 25 will never fall off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor having a built-in check valve on the low pressure side of the cylinder.

BACKGROUND OF THE INVENTION In recent years, compressors used in household refrigerators and the like are rapidly shifting to horizontal rotary compressors due to their ease of storage.

A conventional rotary compressor will be described below with reference to the drawings. In FIG. 3, reference numeral 1 denotes a substantially cylindrical closed container long in the transverse direction, a motor M consisting of a stator 2 and a rotor 3, and a compression device C driven by this motor M.
is stored.

4 is oil, which is collected at the bottom of the sealed container 1.

5 is the cylinder, and 6 and 7 are the main bearings.

The secondary bearings are closely attached to both sides of the cylinder 5 and form a compression chamber 8. A shaft 9 is connected to the rotor 3 and has an eccentric portion 1o. A roller 11 is fitted into the eccentric portion 10 and is inscribed in the compression chamber 8. A vane 12 is pressed against the roller 11 by a spring (not shown) to partition the compression chamber 8 into high and low pressure sides. Reference numeral 13 denotes a suction pipe, one end of which is fitted into the sub-bearing 7, the other end protruding from the closed container 1, and connected to a refrigeration system (not shown) via a check valve 19. The check valve 19 includes a valve 21 that is operated by gravity and a valve seat portion 20, and is arranged so that the direction in which the valve 21 moves coincides with the direction in which it moves. 14 is a discharge pipe which is welded to the closed container 1.

In the above configuration, the rotation of the rotor 3 is transmitted to the shaft 9, the roller 11 fitted in the eccentric part 10 rotates eccentrically in the compression chamber 8, and the page 712 pressed against the row 26 causes the compression chamber 8 to By partitioning the inside into a high-pressure side and a low-pressure side, gas sucked in through the suction pipe 13 is continuously compressed. The compressed high-pressure gas is once released into the closed container 1 and then discharged from the discharge side 14. At this time, the valve 21 is pushed up by the force of the gas, and the suction gas continues into the suction pipe 1.
3 and flows into the compression chamber 8. Next, when the rotor 3 stops rotating, the compressed high-pressure gas in the sealed container 1 passes through the gap between the cylinder 5 and the raw bearing θ, the auxiliary bearing 7, or the gap between the vane 12, etc., and enters the suction side. flow backwards.

When this backflow of high pressure gas enters the refrigeration system,
There is a problem with heating the evaporator, but check valve 1
In the meantime, the valve 21 is brought into close contact with the valve seat 20 by the backflow of high pressure gas and its own weight, and the backflow of the high pressure gas is stopped at the backflow valve 19.

Problems to be Solved by the Invention As mentioned above, the check valve 19 is one of the components installed in a refrigeration system using a rotary compressor for the purpose of preventing backflow of high-pressure gas. Furthermore, since the valve 21 operates by its own weight, it is necessary to align the direction of movement of the valve 21 with the direction of gravity, which has the disadvantage of complicating the piping. Also,
The valve 21 and the valve seat 20 are necessary to prevent leakage.
Because it requires extremely high precision, it inevitably becomes an expensive component. Further, since the device is installed in a refrigeration system, there are problems such as an increase in the number of welding points.

In view of the above-mentioned problems, the present invention provides a rotary compressor that is inexpensive and allows simple piping.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention forms a reverse valve having a reed and a coil spring between the suction tube and the compression chamber, and The free length of the coil spring is configured such that when the coil spring is fitted into a spring holding portion provided in the cylinder, the end thereof does not protrude from the end face of the cylinder.

Effect: Due to the above-mentioned configuration, the present invention allows an easy-to-assemble check valve to be installed inside the rotary compressor, thereby eliminating the need for complicated piping or
An increase in welding points for arranging parts into the system can be avoided.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and parts that are the same in structure and operation will be omitted.

In FIG. 1, 25 is a flat reed, 26 is a coil spring, and each reed guide portion 27 is bored in the cylinder 6. The coil spring 2 is slidably fitted into the spring holding portion 28.
The free length of cylinder 6 is shorter than the thickness dimension of cylinder 6. Two pass holes communicate with the compression chamber 8 and the spring holding portion 28 . 30 is the end face of the secondary bearing 7, which is polished and finished.

In this configuration, the operation will be explained first. When the rotary compressor is operating, the reed 25 is pressed against the coil spring 26 side by the force of the suction gas against the spring force of the coil spring 26, and the suction gas passes through the path hole 29 and enters the compression chamber 8. flows into. Next, when the rotary compressor stops, the flow of intake gas stops immediately after the rotary compressor stops, and the reed 26 is pushed out toward the sub-bearing 7 by the force of the coil spring 26. At the same time, high-pressure gas flows backward from the compression chamber 8 through the pass hole 29, and the lead 25
9 and seals, so the backflow of high pressure gas stops at this part.

Next, the assemblability of this embodiment will be explained. Figure 2 shows lead 25. The coil springs 26 are connected to lead guide portions 27 . This figure shows the state in which the lead 26 is inserted into the spring holding part 28. At this time, the lead 26 is partially or completely located in the lead guide part 27 at a position below the cylinder end surface.

For this reason, in the next assembly process of attaching the secondary bearing to the cylinder 5, the lead 26 may fall off or become misaligned, causing the cylinder 5. Assembly defects such as being caught between the sub bearings 7 are less likely to occur.
Productivity is extremely good.

Effects of the Invention As described above, the present invention forms a check valve having a reed and a coil spring between a suction tube and a compression chamber, and the free length of the coil spring is equal to that of the spring provided in the cylinder. By setting the end so that it does not protrude from the cylinder end face when inserted into the holding part, it is possible to incorporate a check valve that is extremely easy to assemble, and there is no need to install a check valve in the refrigeration system. This avoids complicated piping and an increase in the number of welding points in the system.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a sectional view showing a state in the middle of assembly, and FIG. 3 is a sectional view of a conventional rotary compressor. 5... Cylinder, 6... Main bearing, 7... Sub bearing, 13... Suction tube, 25... Lead, 26...・
····coil spring. Name of agent: Patent attorney Toshio Nakao and one other person, f
---Syrinth 7- Δ---Main bearing γ 7--・Sub-pair φ IJ--・Size Sidan + Knee 7゜26 ---Carp I Resuarin 7'', ? ρ 25-m-lead 26--coil 7") Fig. 2

Claims (1)

[Claims] A motor consisting of a stator and a rotor is placed in a sealed container,
A compression device including a shaft rotated by the motor, a cylinder forming a compression chamber, a main bearing and a sub-bearing closely attached to both sides of the cylinder, and a suction tube that guides intake gas to the compression chamber, A check valve having a reed and a coil spring is formed between the suction tube and the compression chamber of the cylinder, and the free length of the coil spring is such that the coil spring is attached to a spring holding part provided in the cylinder. A rotary compressor whose end is set so that it does not protrude from the end face of the cylinder when inserted.