JPH02308994A - Twin type rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the change of pressure in a casing to decrease vibration by releasing gas discharged from a first and a second cylinder in a discharge chamber, and releasing it via a discharge passage in the casing. CONSTITUTION:A motor 2 is fitted in the upper portion of a casing 1, a compression element 4 having a first cylinder 6, a second cylinder 7 and rollers 62, 72 which get a middle plate 5 therebetween the furnished therein. Gas is supplied from an intake gas pipe 11 to each cylinder chamber 61, 71 to be compressed at a phase difference of 180 degree and the gas is entered from discharge holes 63, 73 via discharge valves 8, 8 to a discharge chamber 51. Hereupon, the superposition of pulsation is performed and the gas is supplied from a discharge passage 9 into the casing 1, so that the change of pressure in the casing is reduced and vibration is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a twin rotary compressor having two cylinders.

(Prior art) Conventionally, twin rotary compressors
-108590, and as shown in Fig. 4, a motor (MT
) is installed inside, and the motor (MT
) is driven by the drive shaft (K), and the eccentric directions are 180 degrees from each other.
A compression element (CF) with two eccentric portions (El) (E2) shifted by degrees is provided. The compression element (CF) is
Middle play) Two first and second cylinders (CL1) (Cl3) are arranged on both sides above and below with (MP) in between,
In each of the cylinder chambers (A) and (B), the eccentric portion (El)
(R2) and rollers (R1) (R2) fitted thereto
In addition, each cylinder (CLl) (Cl3
), the front and rear heads (FH) (R
H) is arranged, each head (FH) (RI-1
) are equipped with upper and lower discharge mufflers (Ml) (R2), respectively.

In this way, each roller (R1) (R2) is rotated with a phase difference of 1806 in each of the cylinder chambers (A) and (B), and the discharge holes (Hl) provided in each of the heads (FH) and (RH) are rotated. (
180 inside each muffler (Ml) (R2) from R2)
The discharged gas is released with a phase difference of .degree., the compression load applied to one rotation of the drive shaft (K) is distributed, and the load torque of the motor (MT) is averaged.

(Problems to be Solved by the Invention) According to the above configuration, in addition to averaging the load) and torque, the timing of discharge from each discharge hole (Hl) (R2) is
Because of the 0° deviation, the discharge pulsations from one discharge hole and those from the other cancel each other out with their peaks and bottoms overlapping, reducing pressure fluctuations in the lower space (S) of the motor (MT) and reducing the pressure fluctuations in the lower space (S) of the motor (MT). The eccentric portions (El) (R2) in the cylinders (CL1) (Cl3) due to the downward movement of the rotor in the motor (MT) and the vertical movement of the drive shaft (K)
) is expected to be able to prevent adverse effects caused by vibration, such as interference between the upper and lower end surfaces of the

However, in the above configuration, the gas discharged from the upper discharge hole (Hl) passes through the upper muffler (Ml) in a relatively short path to the lower space (S) of the motor (MT).
On the other hand, the gas discharged from the lower discharge hole (R2) to the lower muffler (R2) passes through communication passages formed through the cylinders and the middle plate, etc.
It is discharged into the lower space (S) through a path that is as long as the thickness of at least two cylinders (CL1) (Cl3). For this reason, the phase difference of each discharge pulsation deviates from 180° due to the difference between the long and short discharge paths and is synthesized in the space, so the pulsation reduction effect due to the overlap between the peak and the bottom cannot be expected, and the path length Depending on how the values are taken, in the worst case, the peaks may overlap and the pulsation will be doubled, causing a problem that will lead to large vibrations.

On the other hand, considering the difference in pulsation in the length of the two discharge paths, for example, an internal passage formed in a cylinder, etc., which becomes the lower discharge path, is determined by the phase difference of each discharge pulsation in the space (S). It is conceivable to design the passage length so that it is 180°, but even in this case, the combination of pulsations is performed at the end of the two discharge paths with different passage lengths, so the rotation is controlled by inverter control etc. If the number is made variable, the way the pulsations are shifted will be different for each frequency, making it impossible to suppress vibrations in all frequency ranges.

The present invention was made in view of the above problems, and its purpose is to provide a twin rotary compressor that can reduce vibrations due to pulsation of discharged gas even when the rotation speed is changed by inverter control etc. It is about providing.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a casing (
A compression element (1) comprising a first cylinder (6) and a second cylinder (7) with a middle plate (5) in between.
4) is arranged in each cylinder chamber (61,) (71),
180 rollers (82) (72) driven by the drive shaft (21) of the motor (2) whose rotation speed can be controlled are installed inside.
In a twin rotary compressor configured to discharge compressed gas from each discharge hole (63) and (73) with a phase difference of
Discharge chamber (51) that releases gas discharged from (73)
The discharge chamber (51) is opened into the casing (1) through a discharge passage (9).

Further, the discharge valve (8) has the respective discharge holes (E3) at both ends thereof.
3) It is formed into a U-shape with valve parts (81) (81) that cover (73), and the middle part of the discharge valve (8) is connected to the inner side wall of the discharge chamber (51) along the axial direction. (52), a screw (1o) that threads in the radial direction of the middle plate (s);
It may be fixed with.

(Function) The discharged gas from each of the discharge holes (63) and (73) is once released into the discharge chamber (51) of the middle plate (5) disposed close to each of the cylinders (6) and (7), respectively. It is discharged from the discharge chamber (51) into the casing (1) via the discharge passage (9). Each discharge hole (133) (
Since the two discharged gases are combined in the discharge chamber (51) near the discharge chamber (51), and the path lengths to the casing (1) are the same, the frequency of each discharge pulsation changes by changing the rotation speed. However, the phase relationship between these two pulsations is maintained at 180°, and in this state the two pulsations are superimposed, so
This makes it possible to reduce pressure fluctuations within the casing (1) and suppress vibrations.

Further, a U-shaped discharge valve (8) having valve parts (81) (81) covering the respective discharge holes (63) (73) at both ends is formed, and the middle part of the discharge valve (8) is When fixing the middle plate (5) to the internal side wall (52) of the discharge chamber (51) along the axial direction with screws (10) that thread in the radial direction, the structure is simple and easy to assemble. It is possible to improve the

(Example) The twin rotary compressor shown in FIG. 3 has a motor (2) whose rotation speed can be controlled by inverter control etc. installed in the upper part of a sealed casing (1). A support body (3) is fixed to the lower side of the support body (3), and a compression element (4) is assembled to the lower side of this support body (3).

The compression element (4) has a first cylinder (6) and a second cylinder (7) located above and below the middle plate (5).
and arranged in each cylinder chamber (61) (71),
The rollers (62) and (72) are rotatably installed inside the drive shaft (21) connected to the motor (2), and eccentric shaft portions (62, 72) each displaced by 1806 degrees are located at two locations on the lower side of the drive shaft (21) connected to the motor (2).
22) and (23) are provided, and the respective eccentric shaft portions (22) and (23) are provided.
) is inserted into each of the rollers (62) (72), and these rollers (82) (72) are inserted into each of the cylinder chambers (6tl).
) (71), the suction gas is compressed alternately with a phase difference of 1806 in each cylinder chamber (61) (71), and each compressed gas is delivered to each discharge hole (63).
(73) and is discharged inside the casing (1) into the lower space (S) of the motor (2).

In the same figure, (11) is an intake gas pipe, and each cylinder chamber (11) is a suction gas pipe.
Gas is supplied individually into 61) and (71), and (12) is an external discharge pipe, and (13) is a cylinder head attached to the lower side of the second cylinder (7).

However, in the above twin rotary compressor,
As shown in detail in Figure 1, the middle play 1-(
5) is composed of three plate-like members, namely, a thin first member (5A) disposed opposite to the first cylinder (6) side, and a thin first member (5A) disposed opposite to the second cylinder (7) side. The third member is composed of a thin second member (5B) and a thick third member (5C) sandwiched between these members (5A) and (5B).
One discharge chamber (51) is formed in a part of the outer periphery of the member (5C), and the first and second members (5A) (5B)
are provided with the respective discharge holes (83) and (73) each opening into the discharge chamber (51), while the first and second members (5A) and (5B) are provided with respective discharge holes on the discharge chamber (51) side. A plate-shaped discharge valve (8) that covers each of the discharge holes (63) and (73).
(8) and its valve parts (84) (84) are provided.

Further, the first member (
5A), the first cylinder (6) and the support (3),
A discharge passage (9) is formed from the discharge chamber (51) to the space (S).

Then, the gas compressed in each of the cylinder chambers (61) and (71) is transferred from each of the discharge holes (83) and (73) to the discharge chamber (51) by opening and closing of each of the discharge valves (8).
Discharge is performed with a phase difference, and from the discharge chamber (51) to the discharge passage (
9) into the space (S).

By doing so, the two discharged gases are combined in the discharge chamber (51) near each discharge hole (63) (73), and the path length to the casing (1) becomes the same.
Even if the frequency of each discharge pulsation changes due to changes in rotation speed,
The phase relationship between these two pulsations is maintained at 180°, and in this state the two pulsations overlap, so the casing (
1) It is possible to reduce pressure fluctuations within the chamber and suppress vibrations.

Further, as shown in FIG. 2, the discharge valve (8) is bent into a generally U-shape as a whole, and a valve that covers each of the discharge holes (63) and (73) is provided at opposite ends thereof. Part (81) (81
) are integrally provided, and each valve part (81)
A mounting portion (82) fixed to the inner side wall (52) of the discharge chamber (51) may be formed at an intermediate portion connecting the discharge chamber (51), and the discharge valve (8) formed in this manner It is assembled inside as follows.

That is, as shown in the same figure, for example, the middle plate (5) is constituted by one plate-like member, and the outer peripheral side thereof is open to the inside of the casing (1), and each of the discharge holes ( 83) A discharge chamber (51) is formed in which the discharge chamber (73) is opened, and a lid (53) is attached to the open side of the discharge chamber (51).

Then, with the lid (53) removed, the discharge chamber (51) is opened from the open outside side of the middle plate (5).
The discharge valve (8) is inserted into the chamber, and its mounting portion (82) is brought into contact with the inner side wall (52) of the discharge chamber (51), and the discharge valve (8) has a roughly U-shaped inner side. valve holder (8
3), insert these discharge valve (8) and valve holder (83)
and are fixed to the inner side wall (52) by screws (10) that extend in the radial direction of the middle plate (5), respectively, and when doing so, each of the discharge valves (8) is The holes (83) and (73) can be opened and closed, making it possible to simplify the configuration and improve ease of assembly.

Incidentally, the above-described discharge valve (8) can also be applied to the middle plate (5) consisting of the three structural members shown in FIG.

(Effects of the Invention) As explained above, in the present invention, the middle plate (5) interposed between the first and second cylinders (6) and (7) is provided with Since a discharge chamber (Sl) is formed to open the discharged gas, and this discharge chamber (51) is opened into the sealed casing (1) through the discharge passage (9), regardless of the rotation speed, the This makes it possible to cancel out the two discharge pulsations, reduce pressure fluctuations in the casing (1), and suppress vibrations.

Further, a U-shaped discharge valve (8) having valve parts (81) (81) covering the respective discharge holes (θ3) (73) is formed at both ends, and the middle part of the discharge valve (8) is When fixing the middle plate (5) to the internal side wall (52) of the discharge chamber (51) using screws (10) that extend in the radial direction, it is possible to simplify the configuration and improve ease of assembly. It is ゛.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing essential parts of a twin rotary compressor according to the present invention, FIG. 2 is a sectional view showing another embodiment, and FIG. 3 is a longitudinal sectional view showing the overall structure of the compressor. FIG. 4 is a sectional view showing a conventional example. (1) -φ...Fist...Casing (2)...s@**e・Motor (21)-"Φ・lI-Drive shaft (4)...IIφFist...Compression element (5) -Φ11 fist 11Φ・・Middle plate (51)・
Fist/Fist...Discharge chamber (52) Φ/-Fist/Ki/Inner side wall (6) @+1@+1@/Fist/1st cylinder (7)-/Work/Sha...2nd cylinder (61 ) (71)...Cylinder chamber (62) (72) Fighter/Roller (633) (73)/φ/Discharge hole (8)φ... Fighter IIIφ discharge valve (81)...Fist・Valve part (9) -Φ- Salary・Fist・Fog discharge passage (10)・1φ...screw

Claims (1)

[Claims] 1) Inside the casing (1), a middle plate (5)
A compression element (4) comprising a first cylinder (6) and a second cylinder (7) on both sides is installed inside, and each cylinder chamber (61)
(71) is equipped with rollers (62) (72) driven by the drive shaft (21) of the motor (2) whose rotation speed can be controlled, and each discharge hole (63) (73) is provided with a phase difference of 180°. ), the middle plate (5) is provided with a discharge chamber (51) for releasing the gas discharged from each of the discharge holes (63) and (73). A twin rotary compressor characterized in that the discharge chamber (51) is opened into the casing (1) via a discharge passage (9). 2) Valve parts (81) covering each discharge hole (63) (73) at both ends.
) (81), and the middle part of the discharge valve (8) is attached to the inner side wall (52) of the discharge chamber (51) along the axial direction, and the middle plate (5) 2. The twin rotary compressor according to claim 1, wherein the twin rotary compressor is fixed by a screw (10) which extends in a radial direction.