KR100301489B1 - Crank shaft support device for scroll fluid machine - Google Patents

Abstract

The present invention relates to a crankshaft support device of a scroll fluid machine. Conventionally, by making the rotor longer than the stator to produce a magnetic force (Fm) in the direction to cancel the force generated by the pressure difference, this not only causes a loss of the motor consisting of the rotor and the stator, but also increases the cost There was a problem that caused. Therefore, the present invention forms a compression chamber by engaging the rotating scroll and the fixed scroll is formed in the involute curve to each other, compressing the refrigerant gas while the rotating scroll is rotated by the rotation of the crank shaft press-fitted to the rotor, A scroll fluid machine for rotatably supporting a crankshaft with a journal bearing of a mainframe and a ball bearing of a subframe, the scroll fluid machine comprising a support means for elastically supporting the crankshaft in close contact with a ball bearing side of a subframe to reduce vibration caused by instability of the crankshaft. It is possible to stabilize the rotational motion of the crankshaft, and to make the rotor length longer, as in the prior art, to make the motor invalid part for making the magnetic force (Fm) of the motor unnecessary. And cost reduction effect. All.

Description

Crankshaft Support Device for Scroll Fluid Machine {CRANK SHAFT SUPPORT DEVICE FOR SCROLL FLUID MACHINE}

The present invention relates to a crankshaft support device for a scroll fluid machine that elastically supports the crankshaft in close contact with the ball bearing side of the subframe.

In general, the scroll fluid machine has a main frame 2 and a subframe 3 installed at left and right sides of the chamber 1 in a horizontal direction, as shown in FIG. 4) The rotor 5 is provided inside, and the rotor 5 is configured to rotate inside the stator 4 by electromagnetic interaction by power supply. In addition, the rotor 5 is provided with a press-fitted crankshaft 6 having an oil supply passage 6A therein in the form of a horizontal rod to penetrate the center portion, and left and right ends of the crankshaft 6. It is rotatably supported by the main frame 2 and the subframe 3, respectively. At this time, the crankshaft 6 on the main frame 2 side is rotatably supported by the journal bearings 2A and 2B, and the crankshaft 6 on the subframe 3 side is rotatable by the ball bearing 3A. Is supported. In addition, a turning scroll 7 having a wrap 7A formed on an involute curve at the left side of the main frame 2 is coupled to the left end eccentric 6B of the crankshaft 6. The left side of the scroll 7 is provided with a fixed scroll 8 which meshes with the wrap 7A of the swinging scroll 7 to form a compression chamber 9. At the same time, a discharge chamber 10 is formed in the left space of the fixed scroll 8, and a suction port 11 is provided in the discharge chamber 10 in communication with the compression chamber 9. In addition, an old dam ring (not shown) is formed between the main frame 2 and the turning scroll 7 as a rotating prevention mechanism, and a discharge tube 12 is installed in the chamber 1 on the opposite side thereof. An oil supply pipe 13 is installed at an end side of the crankshaft 6 supported by the ball bearing 3A of the subframe 3 to supply oil F through the oil supply pipe 13, and the crank An oil pump 124 for supplying oil F to the journal bearings 2A and 2B is provided for lubrication of the journal bearings 2A and 2B in contact with the shaft 6. Here, reference numeral 8A denotes a wrap of the fixed scroll 8.

The scroll fluid machine thus configured is first powered by a stator 4, and the rotor 5 inside the stator 4 rotates by electromagnetic interaction with the stator 4.

As a result, the crankshaft 6 press-fitted to the center of the rotor 5 rotates, and the rotating scroll provided on the left end eccentric 6B of the crankshaft 6 by the rotation of the crankshaft 6 7) the eccentric rotation by the eccentric distance, wherein the turning scroll (7) is a turning movement at a distance away from the axial center by the turning radius by the Old Daming (not shown).

The compression chamber 9 is formed between the turning scroll 7 and the wraps 7A and 8A of the fixed scroll 8 by the turning motion of the turning scroll 7, and the compression chamber 9. The volume is reduced while moving to the center by the continuous turning movement to further compress the refrigerant gas sucked into the chamber (1) through the inlet (11).

The compressed refrigerant is again discharged to the discharge chamber 10 through the discharge port 8B formed in the fixed scroll 8, the compressed refrigerant gas discharged to the discharge chamber 10 is moved along the path indicated by the arrow and The compressed refrigerant gas discharged through the discharge pipe 12 to the other device constituting the cycle is discharged through the discharge port 8B of the fixed scroll (8) is the high temperature and high pressure of the chamber (1) The inside of one side is filled to form a high pressure part, and the subframe 3 forms a relatively low pressure part by receiving refrigerant gas, so that the oil F cranks through the oil supply pipe 13 due to the pressure difference between the two space parts. The oil is supplied to the oil supply passage 6A side of the shaft 6.

On the other hand, the pressure of the upper end of the shaft becomes the discharge pressure, the pressure of the lower end of the shaft is increased by the oil pump than the discharge pressure, the force generated by the pressure difference is as follows.

Ftotal = Fd- (Fd '+ Fpump)

Fd = Pd × (A1) ... (1)

Pd: Discharge pressure, A1: Discharge pressure on the shaft

Fd '= Pd × (A1-A2) ..... (2)

A2: Area where the pressure rise by the oil pump in the shaft acts

Fpump = (Pd + Ppump) × A2 ...... (3)

Ppump: Pressure rise by oil pump

ToFtotal = -Ppump × A2

In the above equation, the force acting on the shaft acts toward the turning scroll 7 by the product of the pressure pump by the oil pump and the cross-sectional area A2.

This may also lead to instability of the support of the crankshaft 6 in the ball bearing 3A of the subframe 3 so that the rotor 5 is made longer by "A" than the stator 4 as shown in FIG. Magnetic force (Fm) in the direction to cancel the force generated by the pressure difference.

However, such a conventional scroll fluid machine makes the magnetic force (Fm) in the direction to cancel the force generated by the pressure difference by making the rotor longer than the stator as described above, which is composed of the rotor and the stator In addition to causing the loss of the motor, there was a problem of causing a cost increase.

Therefore, an object of the present invention is to minimize the influence of the crankshaft by the pressure difference between the upper and lower side of the crankshaft.

1 is a cross-sectional view showing the internal configuration of a conventional scroll fluid machine.

Figure 2 is an excerpt of the motor portion of Figure 1 for explaining the force balance relationship of a conventional crankshaft.

Figure 3 is a cross-sectional view showing the internal configuration of the scroll fluid machine according to the present invention.

Figure 4 is an excerpt of the motor portion of Figure 3 for explaining the force balance relationship of the crankshaft according to the present invention.

** description of the symbols for the main parts of the drawings **

F: Oil 111: Chamber

112: main frame 112A, 112B: journal bearing

113: Subframe 113A: Ball bearing

114: stator 115: rotor

116: crankshaft 116A: oil supply flow path

116B: Eccentric Part 117: Slewing Scroll

117A, 118A: Lap 118B: Discharge outlet

119: compression chamber 120: discharge chamber

121: intake 122: discharge pipe

123: oil supply pipe 124: oil pump

125: Spring 126: Ring

127: flange

In order to achieve the object of the present invention, the rotating scroll and the fixed scroll formed in the involute curve is engaged with each other to form a compression chamber, and the rotating scroll is rotated by the rotation of the crank shaft press-fitted to the rotor refrigerant gas In the scroll fluid machine for rotatably supporting the crankshaft to the bearing of the main frame and the bearing of the subframe, the scroll fluid machine, characterized in that it comprises a gripping means for elastically supporting the crank shaft in close contact with the ball bearing side of the subframe. A crankshaft support of one scroll fluid machine is provided.

In addition, the gripping means is characterized in that the spring is mounted to the main frame, and is formed integrally with the crankshaft flange consisting of a surface contact with the spring.

And the spring is characterized in that the leaf spring.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a cross-sectional view showing the internal configuration of the scroll fluid machine according to the present invention, Figure 4 is an excerpt of the motor portion of Figure 3 for explaining the force balance relationship of the crankshaft according to the present invention, the scroll fluid machine is generally The main frame 112 and the subframe 113 are installed on the left and right sides of the chamber 111, and the rotor 5 is provided in the stator 4 therebetween.

In addition, the rotor 115 has a crank shaft 116 is press-installed having an oil supply passage 116A, the crank shaft 116 is a journal bearing (112A) (112B) and the sub of the main frame (112) It is rotatably supported by the ball bearing 113A of the frame 113.

A turning scroll 117 having a wrap 117A formed at the left side of the main frame 112 is coupled to the left end eccentric portion 116B of the crankshaft 116, and is pivoted at the left side of the turning scroll 117. A fixed scroll 118 is provided which meshes with the wrap 117A of the scroll 117 to form a compression chamber 119.

In addition, the discharge chamber 120 is formed in the left space portion of the fixed scroll 118, the suction port 121 is provided in the discharge chamber 120.

In addition, an old dam ring (not shown) is formed between the main frame 112 and the turning scroll 117 as a rotation preventing mechanism, and a discharge pipe 122 is installed in the chamber 111 opposite thereto.

In addition, the oil supply pipe 123 and the oil pump 124 are installed on the crankshaft 116 of the subframe 113 side.

Here, reference numeral 118A denotes a wrap of the fixed scroll 118.

In such a scroll fluid machine, the present invention is equipped with a spring 125 and a ring 126 on the mainframe 112 as shown in Figures 3 and 4. The spring 125 is integrated with the ring 126 by a leaf spring, and the assembly is fixed and mounted on the lower surface of the main frame 112, in the figure, the right end surface by welding or the like.

In addition, the crank shaft 116 is integrally formed with a flange 127 protruding outward so that the elastic force by the spring 125 is applied to the crank shaft 116, wherein the protruding length of the flange 127 is On the bottom surface of the main frame 112 on which the spring 125 and the ring 126 are mounted, or on the drawing, a length corresponding to the surface of the right end of the main frame 112 is projected to face each other.

In addition, the position of the flange 127 is a position where the spring 125 mounted on the main frame 112 by the flange 127 can be compressed when assembling the crankshaft 116 to the main frame 112. Is preferred.

In addition, when the force (Fs) acting on the crankshaft 116 by the elastic force of the spring 125 to supply the oil (F) to the journal bearing 126 side of the main frame 112 through the oil pump 124. It is more preferable to select a spring 125 having rigidity greater than the force Ftotal generated by the difference between the upper and lower pressures of the crankshaft 116.

In the present invention configured as described above, first, power is supplied to the stator 114, and the rotor 115 inside the stator 114 rotates by electromagnetic interaction with the stator 114.

As a result, the crankshaft 116 press-fitted to the center of the rotor 115 is rotated, and the rotating scroll provided on the left end eccentric portion 116B of the crankshaft 116 by the rotation of the crankshaft 116 ( 117 rotates eccentrically by the eccentric distance, wherein the turning scroll 117 is rotated at a distance away from the axial center by the turning radius by the Old Daming (not shown).

In addition, a compression chamber 119 is formed between the turning scroll 117 and each of the wraps 117A and 118A of the fixed scroll 118 by the turning movement of the turning scroll 117, and the compression chamber 119. The volume is reduced while moving to the center by the continuous turning movement to further compress the refrigerant gas sucked into the chamber 111 through the suction port 121.

In addition, the compressed refrigerant is discharged to the discharge chamber 120 through the discharge port 118B formed in the fixed scroll 118, the compressed refrigerant gas discharged to the discharge chamber 120 is moved along the path indicated by the arrow and While being circulated, it is sent to another device constituting a cycle through the discharge tube 122, wherein the compressed refrigerant gas discharged through the discharge port 118B of the fixed scroll 118 is inside the one side of the chamber 111 in a state of high temperature and high pressure. To form a high pressure portion, and the subframe 113 forms a relatively low pressure portion through which refrigerant gas is sucked, so that the oil F is fed to the crankshaft through the oil supply pipe 123 by the pressure difference between the two space portions. Lubrication is supplied to the oil supply passage 116A side of 116.

On the other hand, the crank shaft 116 is in close contact with the ball bearing 113A side of the subframe 113 by the elastic force of the spring 125 mounted on the main frame 112, the force (Fs) acting at this time is an oil pump When the oil F is supplied to the journal bearings 112A and 112B of the mainframe 112 through 124, the oil F acts more than the force generated by the pressure difference between the upper and lower parts of the crankshaft 116. In this way, it is possible to solve the instability of the crankshaft 116 due to the pressure difference,

Thus, the present invention can reduce the vibration caused by the instability of the crankshaft by allowing the crankshaft to be supported by using a spring having a rigidity greater than the force generated by the pressure difference between the upper and lower parts of the crankshaft when supplying oil to the journal bearing of the mainframe. In addition to stabilizing the rotational motion of the crankshaft, and as the conventional, the invalid part of the motor to make the magnetic force (Fm) of the motor by making the length of the rotor unnecessary, so that the loss caused by the invalid part and It has the advantage of cost reduction effect.

Claims (3)

The rotating scroll and the fixed scroll formed by the involute curve are engaged with each other to form a compression chamber, and the rotating scroll compresses the refrigerant gas by the rotation of the crank shaft, which is press-fitted to the rotor, and compresses the refrigerant gas. A scroll fluid machine for rotatably supporting a bearing of a bearing and a bearing of a subframe, And crank means for elastically supporting the crank shaft in close contact with the ball bearing side of the subframe. The crankshaft supporting apparatus of claim 1, wherein the gripping means comprises a spring mounted to the mainframe and a flange integrally formed on the crankshaft and in surface contact with the spring. 3. The crankshaft support of claim 2, wherein the spring is a leaf spring.