CN103591023B - A kind of eccentric block type radial flexible compensating mechanism of rolling piston class fluid machinery - Google Patents

Abstract

An eccentric block type radial flexible compensation mechanism of a rolling piston type fluid machine, including a crankshaft, the crankshaft passes through the cylinder, the part of the crankshaft located inside the cylinder is the crankshaft eccentric part, the eccentric block sleeve is sleeved on the outside of the crankshaft eccentric part, and the eccentric block shaft The inner arc surface of the sleeve is closely attached to the outer arc surface of the eccentric part of the crankshaft, and the outer circle of the eccentric block bushing is closely attached to the inner circle of the piston; The positioning pin is used to determine the limit angle of the relative rotation between the eccentric block bushing and the eccentric part of the crankshaft; under the joint action of inertial force and external force, the relative rotation between the eccentric block bushing and the eccentric part of the crankshaft occurs, and the center of the piston and the center of the crankshaft The distance changes accordingly, so that the outer circle of the piston can always be attached to the inner wall of the cylinder, which compensates for the errors in the manufacture and assembly of the pump body, thereby reducing the leakage of working fluid from the high-pressure chamber to the low-pressure chamber of the cylinder and reducing energy consumption. Increase power and efficiency.

Description

An Eccentric Block Type Radial Flexible Compensation Mechanism for Rolling Piston Fluid Machinery

technical field

The invention relates to a fluid machine, in particular to an eccentric block type radial flexible compensation mechanism of a rolling piston type fluid machine of a rolling piston type compressor, a vacuum pump, a gas-liquid mixed pump and a liquid pump.

Background technique

Rolling piston fluid machinery refers to a compressor, vacuum pump, gas-liquid mixed pump or liquid pump used to increase the pressure of gas and liquid, and is widely used in refrigeration and air conditioning systems, vacuum, aviation and military industries. In addition to the commonly known rolling piston type, its structure also includes swing type, swing piston type, hinge slide type and swing slide type.

Rolling piston compressors (also known as rolling rotor compressors or rotary compressors) or pumps are characterized by a circular inner wall of the cylinder that remains in contact with the outer circle of the piston. The piston is sleeved on the eccentric part of the crankshaft, and the crankshaft is installed in the bearing connected with the end face of the cylinder. There is a groove on the cylinder, and there are sliding plates capable of reciprocating movement inside. One end of the sliding plate is supported by a spring, and the other end is supported on the outer circle of the piston, and the two jointly divide the cylinder into a low-pressure chamber and a high-pressure chamber. As the crankshaft rotates, the gas in the high-pressure chamber is gradually compressed and finally discharged through the exhaust valve.

The structural feature of the swing compressor or pump (also known as the slide valve vacuum pump) is that the above-mentioned slide vane is integrated with the piston, and the slide slot on the cylinder is changed into a cylindrical hole, and two swing bushes are installed inside, and the swing piston The structural feature of the compressor or pump is that an arc-shaped groove is opened on the outer circle of the piston, and its radius is basically equivalent to the arc of the head of the slide vane. Under the restriction of the slide vane, the piston swings with the rotation of the crankshaft.

The structural feature of the hinged vane compressor or pump is that an arc-shaped groove is opened on the outer circle of the piston, and its cross-section is a superior arc greater than 180°. The end of the sliding piece in contact with the piston is changed to a cylindrical shape, embedded in an arc groove, similar to a hinge connection. The other end of the slider is no longer spring-loaded,

The structural feature of the swing vane compressor or pump is that the hinge of the hinged vane compressor is installed on the cylinder, and at the same time, a slide groove is opened on the piston so that the vane can slide in the middle.

Due to the design structure of the above-mentioned rolling piston type fluid machinery, the radial gap between the piston and the cylinder is often very large, resulting in the leakage of the working fluid in the high-pressure chamber to the low-pressure chamber, reducing the operating efficiency and causing energy loss. In the case of lubricating oil, the lubricating oil can play a certain role in sealing and reduce leakage; while in the case of no oil, the loss caused by the radial clearance is more serious. In addition, the radial clearance will also cause relatively large leakage when the frequency conversion machinery runs at low speed.

Contents of the invention

In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide an eccentric block type radially flexible compensating mechanism of a rolling piston type fluid machine, which compensates the radial gap between the piston and the cylinder, and reduces the internal pressure of this type of machine. Leakage caused by radial clearance reduces energy consumption and increases power and efficiency.

In order to achieve the above object, technical scheme of the present invention is:

An eccentric block type radial flexible compensation mechanism of a rolling piston type fluid machine, including a crankshaft 1, a cylinder 2, an eccentric block sleeve 3, a piston 4 and a positioning pin 5, the crankshaft 1 passes through the cylinder 2, and the crankshaft 1 is located in the cylinder 2 The part of the crankshaft eccentric part 1A, the eccentric block bushing 3 is sleeved on the outside of the crankshaft eccentric part 1A, the inner arc surface 3a of the eccentric block bushing 3 is closely attached to the outer arc surface 1a of the crankshaft eccentric part 1A, and the eccentric block The outer circle 3b of the bushing 3 is in contact with the inner circle 4a of the piston 4 .

Assuming that the crankshaft rotates in the forward direction, the triangle O ₁ O ₂ O ₃ formed by the axis O _{1 of crankshaft 1, the axis O 2 of} crankshaft eccentric part 1A and the center O ₃ of piston 4 is on the rear side of the line connecting O ₁ O ₃ . as shown in picture 2.

A plane 1b parallel to the axis of the crankshaft 1 is set on the outer arc surface 1a of the eccentric part of the crankshaft 1A, a pin hole 3A is set on the eccentric block bushing 3, and a limit pin 5 is inserted, and a plane 1b parallel to the crankshaft 1 axis is set on the outer circle 1a of the eccentric part of the crankshaft. When the axis is parallel to the plane 1b, when the plane 1b is in contact with the limit pin 5, there is no relative rotation between the eccentric part 1A of the crankshaft and the sliding sleeve 3 of the eccentric block. Assuming that the crankshaft rotates in the positive direction, the position of the limit pin hole 3A is at The rear side of crankshaft 1 axis O ₁ piston 4 center O ₃ connecting line, as shown in Figure 2.

In the present invention, under the joint action of inertial force and external force, relative rotation occurs between the eccentric block bushing 3 and the eccentric part 1A of the crankshaft, and the distance e (eccentricity) between the center _O3 of the piston 4 and the center O1 of the crankshaft ₁ changes accordingly. The outer circle 4b of the piston 4 can be attached to the inner wall 2a of the cylinder 2, which compensates for errors in the manufacture and assembly of the pump body, thereby reducing the leakage of the working fluid from the high-pressure chamber of the cylinder 2 to the low-pressure chamber.

The invention can make the rolling piston type fluid machine work, and the outer circle of the piston can be kept in close contact with the cylinder wall, which greatly reduces the radial clearance, reduces the leakage loss from the high-pressure chamber to the low-pressure chamber of the cylinder, and finally Reduce energy consumption and improve efficiency.

Description of drawings

Figure 1 is an exploded view of the parts of the radially flexible compensation structure, in which: 1 is the crankshaft, 1A is the eccentric part of the crankshaft, 1a is the outer circle of the eccentric part of the crankshaft, 1b is the plane that limits the rotation, 3 is the eccentric block bushing, 3A is Limit pin holes, 3a is the inner circle of the eccentric block bushing, 3b is the outer circle of the eccentric block bushing, 4 is the piston, 4a is the inner circle of the piston, 4b is the outer circle of the piston, and 5 is the limit pin.

Figure 2 shows the radially flexible compensation structure. Among them: 1a is the outer circle of the eccentric part of the crankshaft, 2a is the inner circle of the cylinder, 3a is the inner circle of the eccentric block bushing, 3b is the outer circle of the eccentric block bushing, 4a is the inner circle of the piston, 4b is the outer circle of the piston, and 5 is the limit Pin, 9 is slide plate.

Fig. 3 is a structural schematic diagram of a rolling piston type fluid machine, and the flexible compensation mechanism is inside the dotted line. Among them: 1 is the crankshaft, 2 is the cylinder, 6 is the machine shell, 7A is the motor stator, 7B is the motor rotor, 8A is the upper bearing and also the upper cover of the cylinder, 8B is the lower bearing and also the lower cover of the cylinder.

FIG. 4 is a partially enlarged view of FIG. 3 . Among them: 1A is the eccentric part of the crankshaft, 2 is the cylinder, 3 is the eccentric block bushing, 4 is the piston, 8A is the upper bearing and also the upper cover of the cylinder, 8B is the lower bearing and also the lower cover of the cylinder.

detailed description

The present invention is described in detail below in conjunction with accompanying drawing.

Referring to Fig. 1 and Fig. 2, an eccentric block type radial flexible compensation mechanism of a rolling piston type fluid machine includes a crankshaft 1, a cylinder 2, an eccentric block bushing 3, a piston 4 and a positioning pin 5, and the crankshaft 1 passes through the cylinder 2 The part located inside the cylinder 2 is the crankshaft eccentric part 1A, the eccentric block bushing 3 is sleeved on the outside of the crankshaft eccentric part 1A, and the inner arc surface 3a of the eccentric block bushing 3 is closely connected with the outer arc surface 1a of the crankshaft eccentric part 1A. fit, can slide relative to each other and transmit pressure; the outer circle 3b of the eccentric block bushing 3 and the inner circle 4a of the piston 4 are in close contact.

In order to make the outer circle 4b of the piston fit the inner wall 2a of the cylinder all the time, assuming that the crankshaft rotates in the positive direction, the triangle O ₁ O ₂ formed by the axis O ₁ of the crankshaft 1, the axis O ₂ of the eccentric portion 1A of the crankshaft and the center O ₃ of the piston 4 O ₃ should be located behind the O ₁ O ₃ line, as shown in Figure 2. This can ensure that when the external force and inertial force act on the piston 4 and the eccentric block bushing 3 together, ∠O ₁ O ₂ O ₃ can be opened, and the distance e (eccentricity) between the center O ₃ of the piston 4 and the center O ₁ of the crankshaft 1 It increases accordingly, so that the outer circle 4b of the piston 4 fits the inner wall 2a of the cylinder 2, reducing the leakage caused by the radial clearance.

At certain angles, the resultant force of external force and inertial force will make e smaller and leakage increase. In order to avoid when the resultant force of external force and inertial force is not enough to ensure that ∠O ₁ O ₂ O ₃ is opened, it is necessary to limit the relative rotation of crankshaft eccentric part 1A and eccentric block bushing 3, so as to prevent ∠O ₁ O ₂ O ₃ from decreasing or even reversed Increased leakage leads to increased leakage. Set a plane 1b parallel to the axis of the crankshaft 1 on the outer arc surface 1a of the crankshaft eccentric part 1A, set a pin hole 3A on the eccentric block bushing 3, and insert the limit pin 5; correspondingly, on the crankshaft A plane 1b parallel to the axis of the crankshaft is provided on the outer circle 1a of the eccentric portion. When the plane 1b is in contact with the limit pin 5, there is no relative rotation between the eccentric portion 1A of the crankshaft and the sliding sleeve 3 of the eccentric block, so the size of 1b determines the limit angle of the relative rotation. In addition, in order to reduce the stress between the limit pin 5 and the plane 1b, assuming that the crankshaft rotates in the forward direction, the position of the limit pin hole 3A should be on the rear side of the line O ₁ O ₃ , as shown in Figure 2 .

The working principle of the present invention is as follows: referring to Fig. 3 and Fig. 4, the present invention is used in conjunction with a rolling piston type fluid machine, and the rolling piston type fluid machine includes a motor 7 and a compression assembly arranged in a housing 6.

The motor includes a stator 7A fixed on the casing and a rotor 7B sleeved on the end of the crankshaft. When the compressor is running, the rotor 7B drives the crankshaft 1 to rotate;

Compression assembly includes main bearing 8A and auxiliary bearing 8B, cylinder 2, crankshaft 1, eccentric block bushing 3, piston 4, slide plate 9. The main bearing 8A and the auxiliary bearing 8B are arranged on the upper and lower sides of the cylinder 2 to support the crankshaft 1 and simultaneously seal the cylinder 2 in the axial direction; The interior is divided into a high-pressure chamber and a low-pressure chamber. When the crankshaft 1 rotates, the eccentric part 1A of the crankshaft located inside the cylinder 2 drives the eccentric bushing 3 to rotate, and then drives the piston 4 to roll. As the position of the piston 4 changes continuously, the gas in the high-pressure chamber of the cylinder 2 is gradually compressed, and finally When the crankshaft 1 rotates, the relative rotation between the eccentric block sleeve 3 and the eccentric part 1A of the crankshaft also occurs, and the distance e (eccentricity) between the center O ₃ of the piston 4 and the center O ₁ of the crankshaft 1 changes accordingly, so that The outer circle of the piston 4b can be attached to the inner wall 2a of the cylinder, which compensates the errors produced during the manufacture and assembly of the pump body, thereby reducing the leakage of working fluid from the high-pressure chamber of the cylinder 2 to the low-pressure chamber.

Claims (1)

1. the eccentric block type radial flexible compensating mechanism of a rolling piston class fluid machinery, it is characterized in that, comprise bent axle (1), cylinder (2), eccentric mass axle sleeve (3), piston (4) and position limit pin (5); Bent axle (1) is through cylinder (2), the part being positioned at cylinder (2) inner is crankshaft eccentric portion (1A), eccentric mass axle sleeve (3) is socketed in outside, crankshaft eccentric portion (1A), the inner arc surface (3a) of eccentric mass axle sleeve (3) and the exterior arc surface (1a) in crankshaft eccentric portion (1A) fit tightly, and the cylindrical (3b) of eccentric mass axle sleeve (3) and the inner circle (4a) of piston (4) fit tightly;

If crank rotation direction is forward, the axle center O of bent axle (1) ₁, crankshaft eccentric portion (1A) axle center O ₂with the center O of piston 4 ₃the triangle O formed ₁o ₂o ₃be in O ₁o ₃the rear side of line;

Eccentric mass axle sleeve (3) arranges pin-and-hole (3A), inserts position limit pin (5); Correspondingly, exterior arc surface (1a) in crankshaft eccentric portion is upper arranges the plane (1b) parallel with crankshaft center line, when plane (1b) contacts with position limit pin (5), no longer include between crankshaft eccentric portion (1A) and eccentric mass axle sleeve (3) and relatively rotate, if crank rotation is forward, the position of limit pin hole (3A) is in O ₁o ₃the rear side of line.