JPH0680888U - Vane type rotary compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] A thin and lightweight multi-stage compression type with high compression efficiency that prevents gas leakage from the compressed gas discharge port to the gas suction port and gas leakage between the eccentric rotor and cylinder ( In particular, a two-stage compression type vane rotary compressor is provided. [Structure] A cylinder unit having a circular cylinder hole, a core member fixed to the cylinder unit so as to be located at the center of the circular cylinder hole, and having a cylindrical outer peripheral surface, and an inner peripheral surface of the cylinder hole and an outer periphery of the core member. Between the ring-shaped eccentric rotor, which makes eccentric motion in the cylinder hole while contacting the surface, and the first gas suction port and the first gas discharge port of the first stage of the compression section, and makes sliding contact with the outer circumferential surface of the eccentric rotor. Meanwhile, between the first vane that moves in and out of the peripheral surface of the cylinder hole and the second gas suction port and the second gas discharge port of the second stage of the compression unit,
It comprises a second vane that moves in and out of the outer peripheral surface of the core member while making sliding contact with the inner peripheral surface of the eccentric rotor, and a gas passage that connects the first gas discharge port and the second gas suction port.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vane type rotary compressor.

[0002]

[Prior art and its problems]

 Conventionally, as a vane type rotary compressor, a one-stage compression type single vane type rotary compressor is known. This one-stage compression type single-vane rotary compressor has an outer periphery of the eccentric rotor at a position where one disc-shaped eccentric rotor and the original gas suction port and the compressed gas discharge port of the compressor are hermetically separated from each other. It consists of one vane that protrudes into the cylinder hole according to the rotation of the eccentric rotor so that it always comes into sliding contact with the surface. This one-stage compression type single-vane rotary compressor compresses the raw gas (for example, the atmosphere) sucked through the raw gas suction port by the rotation of the eccentric rotor, and the compressed gas (for example, the atmosphere) from the compressed gas discharge port. , Compressed air). The single-stage compression type single-vane rotary compressor has a single-stage compression structure. Therefore, if the pressure of the compressed gas discharged is to be increased, the original gas intake port and the compressed gas discharge port separated by one vane The maximum pressure difference at the outlet (for example, the pressure difference between atmospheric pressure and compressed air pressure) becomes large. As a result, gas leaks from the contact part between the eccentric rotor and the peripheral surface of the cylinder hole, and gas from the compressed gas discharge port to the original gas intake port through the sliding contact part between the vane and the outer peripheral surface of the eccentric rotor. Leakage occurs and compression efficiency is reduced.

On the other hand, in order to improve the drawbacks of the single-stage compression type single-vane rotary compressor, two compressor bodies composed of a combination of a single vane and an eccentric rotor are arranged side by side with respect to the drive shaft of the electric motor. This reduces the pressure difference between the intake gas and the discharge gas at each stage, thereby causing gas leakage at the contact part between the eccentric rotor of each compressor body and the peripheral surface of the cylinder hole, and from the compressed gas discharge port to the gas suction port. There is also known a two-stage compression type single-vane rotary compressor in which two compressor bodies are connected in series in an air circuit to improve the compression ratio while preventing gas leakage. However, this two-stage compression type single-vane rotary compressor has a drawback that its thickness is doubled as compared with the one-stage compression type single-vane rotary compressor.

[0004]

[Problems to be solved by the device]

 The object of the present invention is to be thin and lightweight, to prevent gas leakage at the contact portion between the eccentric rotor and the cylinder at each stage, and to prevent gas leakage from the compressed gas discharge port to the gas suction port. (EN) A highly multi-stage compression type (particularly two-stage compression type) vane rotary compressor.

[0005]

[Means for Solving the Problems]

 The present invention relates to a cylinder unit having a circular cylinder hole, a core member fixed to the cylinder unit so as to be located at the center of the cylinder hole and having a cylindrical outer peripheral surface, an inner peripheral surface of the cylinder hole and an outer peripheral surface of the core member. Between the first gas suction port and the first gas discharge port and the annular eccentric rotor that eccentrically moves in the cylinder hole while making contact with the cylinder, while making sliding contact with the outer peripheral surface of the eccentric rotor. Between the first vane moving in and out of the peripheral surface of the hole, and the second gas suction port and the second gas discharge port, the inner surface of the eccentric rotor is in sliding contact with the outer surface of the core member. It is characterized in that it comprises a second vane that goes in and out, and a gas passage that connects the first gas discharge port and the second gas suction port.

[0006]

[Operation and effect of the device]

 According to the vane type rotary compressor of the present invention, the first stage of the compression portion is formed by the peripheral surface of the cylinder hole, the first vane and the outer peripheral surface of the eccentric rotor, and the outer peripheral surface of the core member, the second vane and A second stage of the compression section is formed by the inner peripheral surface of the eccentric rotor. As a result, the pressure difference between the gas discharge pressure and the gas suction pressure at each stage is smaller than that of the one-stage compression vane rotary compressor, and gas leakage between the gas discharge port and gas suction port at each stage is reduced. Is reduced. Also, gas leakage between the peripheral surface of the cylinder hole and the outer peripheral surface of the eccentric rotor is reduced at the first stage of the compression section, and between the inner peripheral surface of the eccentric rotor and the outer peripheral surface of the core member at the second stage of the compression section. Gas leakage is reduced. This improves the compression efficiency of the vane type rotary compressor of the present invention. Further, since the vane type rotary compressor of the present invention comprises the first and second stages of the compression section inside and outside of one annular eccentric rotor, the compression section 1 is provided for the same drive shaft of the electric motor. It is thinner than the conventional two-stage compression type vane type rotary compressor in which the second stage and the second stage are arranged side by side.

[0007]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, a two-stage compression type vane rotary compressor according to an embodiment of the present invention mainly includes a frame 2 having a flat base plate 1 installed on a floor or the ground. An electric motor 3, a cylinder rear half portion 4, a rotor unit 5, a partition plate 6, a cylinder front half portion 7, and a cylindrical core member 39. Hereinafter, each part will be described in detail.

The frame 2 has a support wall 8 which is vertically provided with respect to the upper surface of the base plate 1 at approximately the center of the base plate 1 in the longitudinal direction. Further, the frame body 2 has side walls 9 on both sides of the support wall 8 in front of the support wall 8 (right side in FIG. 1), and has a ceiling wall 10 at the upper end of the support wall 8. A through hole 11 is provided slightly below the vertical center of the support wall 8.

The electric motor 3 is fixed to the upper surface of the base plate 1 behind the support wall 8 (on the left side in FIG. 1) by fixing means (not shown). The drive shaft 12 of the electric motor 3 is inserted through the through hole 11 and protrudes forward of the support wall 8, and is connected to the driven shaft 14 of the rotor unit 5 by the coupling 13.

The cylinder rear half portion 4 is a substantially rectangular thick plate and is fixed to the base plate 1, the side wall 9 and the ceiling wall 10 by a fixing means (not shown). A circular concave portion 15 is formed on the front side of the rear half portion 4 of the cylinder so as to be slightly eccentric from the center in the vertical direction. The circular recess 15 penetrates the bottom wall 16 of the circular recess 15 and is connected to a stepped hole 17 coaxial with the circular recess 15.

The rotor unit 5 includes a rotor support portion 27 and an annular eccentric rotor 30. The rotor support portion 27 has a substantially cylindrical boss 19. A circular recess 20 extending in the axial direction is formed in the rear portion (left side in FIG. 1) of the boss 19. A ball bearing 21 is fixed to one portion of the inner peripheral surface of the circular recess 20 so as to project rearward from the bottom wall 20a of the circular recess 20. An eccentric shaft 22 is fitted in the ball bearing 21. The eccentric shaft 22 is connected to the driven shaft 14 by an arm 23. The driven shaft 14 penetrates so as to extend behind the stepped hole 17 in a state of being slidably sealed by a plurality of O-rings 24 mounted on the peripheral surface thereof. The eccentric rotor 30 eccentrically moves in the cylinder hole 37 while being in contact with the inner peripheral surface of the cylinder hole 37 and the outer peripheral surface of the core member 39.

An annular groove 26 is provided on the outer peripheral surface of the boss 19 in the middle of the boss 19 of the rotor support portion 27 so as to fit with the peripheral surface of the circular hole 25 formed in the partition plate 6. An eccentric rotor 30 is provided at the front end portion (right side in FIG. 1) of the boss 19 so as to project radially outward with respect to the boss 19. The eccentric rotor 30 has an L-shaped cross section, as shown in FIG. The rear end of the outer cylindrical portion 28 of the eccentric rotor 30 is in sliding contact with the front surface of the partition plate 6. A circular recess 29 is formed on the inner peripheral side of the eccentric rotor 30.

The cylinder front half portion 7 is a substantially rectangular thick plate, and is fixed to the frame body 2 by fixing means (not shown). A spacer arm 18 extending from the upper end of the cylinder front half portion 7 to the ceiling wall 10 of the frame body 2 is provided to determine the position of the cylinder front half portion 7 in the upward and downward direction. The spacer arm 18 contacts the ceiling surface of the ceiling wall 10. The cylinder front half portion 7 faces the cylinder rear half portion 4 via the partition plate 6. A stepped hole 38 is formed on the front surface side of the cylinder front half portion 7. A stepped cylinder hole 37 for accommodating the eccentric rotor 30, the core member 39, the first-stage compression vane 35, and the second-stage compression vane 36 is formed on the rear surface side of the cylinder front half portion 7.

The core member 39 is inserted into the stepped hole 38 so as to extend from the front surface to the rear surface of the cylinder front half portion 7 and is fixed to the cylinder front half portion 7 (see FIGS. 1 and 5). The core member 39 is provided with a compressed air suction port 42 and a compressed air discharge port 43 on both sides of the partition wall 42a and opens into the cylinder hole 37 (see FIGS. 2 and 5). More specifically, the compressed air discharge port 43 opens into the cylinder hole 37 between the core member 39 and the eccentric rotor 30 via the discharge chamber 43a and the lead valve type discharge valve 43b in the core member 39. .

The first-stage compression vane 35 is constantly pressed by the compression coil spring 35 a housed in the cylinder front half portion 7, protrudes from the peripheral wall surface of the cylinder hole 37, and the outer cylindrical portion 33 of the eccentric rotor 30. Sliding contact with the outer peripheral surface of. At both sides of the first-stage compression vane 35, an air suction port 40 and a compressed air discharge port 41 are provided through the upper end wall of the cylinder front half portion 7 and open into the cylinder hole 37. A compressed air discharge port 41 and a discharge chamber block 45 forming a reed valve type discharge valve 41a and a discharge chamber 44 are provided at the upper end of the cylinder front half portion 7 (see FIGS. 2 and 4).

The second-stage compression vane 36 is constantly pressed by the compression coil spring 36 a housed in the core member 39, protrudes from the core member 39, and slides on the inner peripheral surface of the boss 19 of the rotor 30. Contact. A compressed air suction port 42 and a compressed air discharge port 43 are opened on both sides of the two-stage compression vane 36. The second stage compressed air intake port 42 is connected to the first stage compressed air discharge port 41 via an air passage (not shown).

The operation of the vane type rotary compressor of the present invention will be described below. As shown in FIGS. 6 to 9, the first compression stage and the second compression stage of the compressor have the same phase. In the state immediately before the first stroke and the second suction and compression in the present stroke are completed after the atmospheric suction and the compressed air discharge in the previous stroke (see FIG. 6), the first-stage compression vane 35 is It is at the maximum retracted position so as to form a part of the peripheral surface of the cylinder hole 37 of the cylinder front half portion 7. On the other hand, the second-stage compression vane 36 is also at the maximum retracted position so as to form a part of the outer peripheral surface of the core member 39. The outer peripheral surface of the eccentric rotor 30 is inscribed in the tip portion of the first-stage compression vane 35. On the other hand, the inner peripheral surface of the eccentric rotor 30 circumscribes the tip of the second-stage compression vane 36.

The inner contact point between the eccentric rotor 30 and the peripheral surface of the cylinder hole 37 and the outer contact point between the eccentric rotor 30 and the outer peripheral surface of the core member 39 pass through the opening positions of the suction ports 40 and 42, respectively (see FIG. 7). By this, the current suction and compression are started. At this time, the first-stage compression vane 35 and the second-stage compression vane 36 project into the cylinder hole 37 while making sliding contact with the outer peripheral surface and the inner peripheral surface of the eccentric rotor 30, respectively.

FIG. 8 shows an intermediate state between the suction stroke and the compression stroke. When the inner contact between the outer peripheral surface of the eccentric rotor 30 and the peripheral surface of the cylinder hole 37 and the outer contact between the inner peripheral surface of the eccentric rotor 30 and the outer peripheral surface of the core member 39 are close to the discharge ports 41 and 43, respectively (FIG. 9). (See), the discharge valves 41a and 43a of the discharge ports 41 and 43 are opened, the compressed air is discharged, and the suction and compression of the first and second stages are completed.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a vane type rotary compressor according to an embodiment of the present invention.

FIG. 2 is a partial sectional side view of the vane type rotary compressor of FIG.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is an operation explanatory view of the vane type rotary compressor of FIG. 1, showing a state immediately before air intake and compression start.

FIG. 7 is an operation explanatory view of the vane type rotary compressor of FIG. 1, showing a state in which suction and compression of air are started.

FIG. 8 is an operation explanatory view of the vane type rotary compressor of FIG. 1, showing an intermediate state between intake and compression of air.

FIG. 9 is an operation explanatory view of the vane type rotary compressor of FIG. 1, showing a state in which air suction and discharge are almost completed.

[Explanation of symbols]

 4 Cylinder rear half 5 Rotor unit 7 Cylinder front half 30 Eccentric rotor 35 First vane (first stage compression vane) 36 Second vane (second stage compression vane) 37 Cylinder hole 39 Core member 40 First gas intake port (Atmosphere inlet) 41 First gas outlet (compressed air outlet) 42 Second gas inlet (compressed air inlet) 43 Second gas outlet (compressed air outlet)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitsuyasu Takatsuru 6-6 Hakozakicho, Nihonbashi, Chuo-ku, Tokyo Max Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A cylinder unit having a circular cylinder hole, a core member fixed to the cylinder unit at the center of the cylinder hole and having a cylindrical outer peripheral surface, and an inner peripheral surface of the cylinder hole and an outer periphery of the core member. Between the first gas suction port and the first gas discharge port and the annular eccentric rotor that eccentrically moves in the cylinder hole while being in contact with the surface, the cylinder is in sliding contact with the outer peripheral surface of the eccentric rotor. Between the first vane moving in and out of the peripheral surface of the hole, and the second gas suction port and the second gas discharge port, the sliding contact is made with the inner peripheral surface of the eccentric rotor and the outer peripheral surface of the core member. The second vane that goes in and out of
A vane type rotary compressor comprising a gas passage connecting between a first gas discharge port and a second gas suction port.