CN101027487A - Internal gear compression unit and compressor having the same - Google Patents

Abstract

Disclosed are a compression unit and a compressor having the same. The compression unit includes: a cylinder block (300) having a gear insertion hole therein; an outer gear (200) provided with a plurality of inner teeth (250) on an inner circumferential surface thereof and rotatably inserted into the gear insertion hole; an inner gear (100) having a plurality of outer teeth (150) less than the number of inner teeth (250) of the outer gear (200), embedded in the outer gear (200), and forming a plurality of compression spaces with the inner teeth (250) of the outer gear (200); upper and lower bearings rotatably supporting both ends of the cylinder block in an axial direction; a suction fluid passage (400) formed on the bearing for supplying fluid to the compression space; a discharge fluid passage (500) formed on the bearing for discharging fluid from the compression space; and a contact supporting means (600) inserted into the cylinder block (300) and contact-supported on an outer circumferential surface of the outer gear (200).

Description

Internal gear compression unit and compressor having the same

technical field

The present invention relates to a compression unit and a compressor having the same, and more particularly to a compression unit and a compressor having the same: when the volume of the space formed by contacting two gears changes, the unbalanced application can be reduced. Additional contact force to the cylinder that supports the gear during the compression of the fluid.

Background technique

Usually a compressor is a device used to compress a fluid, such as air, refrigerant gas, etc.

The compressor, together with the evaporator, condenser, etc., constitutes a refrigeration cycle. A refrigeration cycle called a thermodynamic cycle is used to absorb external heat in a cold store or to release heat to the outside in a hot store. The system that makes up the cooling cycle is called a cooling system, and cooling systems are used in refrigerators, air conditioners, heat pumps, etc.

A compressor generally includes a motor unit generating a driving force, and a compression unit compressing gas by receiving the driving force of the motor unit. When the driving force is generated at the motor unit using the applied power, the driving force is transmitted to the compression unit, and thereby sucks, compresses, and discharges gas.

According to the structure of the compression unit, the compressor may be classified into a reciprocating compressor, a scroll compressor, a centrifugal compressor, a vane compressor, and the like. In the compressor described above, the gear type compression unit compresses the fluid using volume change of a space between teeth formed between gears using a plurality of rotating gears.

Various forms of internal gears for gear-type compression units have been disclosed in many books (Earle Buckingham, "Analytical Mechanics of Gears", McGraw-Hill, 1949, and Dover, 1963; pp. 42-47) . Moreover, US 3,946,621 also discloses the shape of the internal gear.

Fig. 1 is a cross-sectional view showing an embodiment of a gear type compression unit consistent with the prior art. As shown, the rotating internal gear 10 is formed in a doughnut shape, and a drive shaft (not shown) is inserted into its inner circumferential surface to transmit a driving force. A plurality of external teeth 15 are formed on the outer circumferential surface of the internal gear 10 .

The external gear 20 is formed in a ring shape, and has a space inside the ring for accommodating the internal gear 10 . Internal teeth 25 are formed on the inner circumferential surface of the external gear 20 , the number of which is greater than that of the external teeth 15 of the internal gear 10 , and are embedded in the external teeth 15 of the internal gear 10 . The center _O1 of the internal gear 10 is spaced apart from the center _O2 of the external gear 20 by a certain distance.

The external teeth 15 of the internal gear 10 are respectively in contact with the internal teeth 25 of the external gear 20 so that a plurality of spaces are formed between the external teeth 15 and the internal teeth 25 .

The external gear 20 is in a state of being inserted into the cylinder 30 having the gear insertion hole, and the outer peripheral surface of the external gear 20 is in contact with the inner peripheral surface of the cylinder 30 and thus supported. The sectional surface of the gear insertion hole of the cylinder 30 forms a complete circle. The outer circumferential surface of the external gear 20 and the inner circumferential surface of the cylinder 30 are generally provided with a gap through which rotation of the external gear is possible and oil is guided thereto.

Upper bearings and lower bearings (not shown) are axially provided at both ends of the cylinder 30 for supporting the rotation of the gears and enclosing the gear insertion space for compressing fluid.

A suction fluid passage 40 is formed inside a bearing (not shown) for supplying fluid to a space between the teeth 15 of the internal gear 10 and the teeth 25 of the external gear 20 . The suction fluid passage 40 is located in a region where the space between the teeth of the external gear and the internal gear gradually expands. Also, a discharge fluid passage 50 is formed in the bearing for discharging the fluid compressed in the space between the teeth of the inner gear 10 and the outer gear 20 . The discharge fluid passage 50 is located in a region where the space between the teeth of the external gear and the internal gear gradually contracts and thereby compresses the fluid to a proper pressure.

The gear-type compression unit compresses fluid using the volume change of the space formed by the external teeth 15 of the internal gear 10 and the internal teeth 25 of the external gear 20, which rotate in an eccentric state with the internal gear.

Assuming that the internal gear rotates clockwise, the operation of the gear type compression unit will be explained in detail below.

When the internal gear 10 rotates, the external teeth 15 come into contact with the internal teeth 25 of the external gear 20 , thereby transmitting a driving force, so that the external gear 20 rotates. The outer circumferential surface of the external gear 20 is in contact with and supported by the inner circumferential surface of the cylinder 30 .

In the clockwise direction, based on the point A on the outer circumference of the outer gear 20 that is farthest from the center _O1 of the inner gear, an area of 180° to 360° is formed, and the space between the two teeth expands in this area. A suction fluid passage 40 is formed in the inflation region to suck fluid. Fluid sucked through the suction fluid passage 40 moves within the interdental spaces. The space between the teeth of the internal gear 10 and the external gear 2 shrinks in the clockwise direction based on the point A on the outer circumference of the external gear 20 that is farthest from the center _O1 of the inner gear, thereby sucking in The fluid is gradually compressed. The discharge fluid passage 50 is formed at a position where the fluid reaches a certain pressure to discharge the fluid. When the internal gear 10 is continuously rotated in the clockwise direction, a region where the space between the two teeth expands is formed again, and the suction fluid passage 40 is formed in the expanded region to suck fluid. The above process is repeated to continuously compress the fluid.

During the process of compressing the fluid, the direction and magnitude of the force applied in the radial direction are different according to the positions of the internal gear and the external gear. Therefore, the position of the contact point between the external gear and the cylinder and the magnitude of the contact force applied to the contact point are continuously changed.

That is, when the internal gear is at a specific position during rotation, an additional contact force is suddenly generated between the external gear and the cylinder, thereby causing wear and overheating of the gear and cylinder.

In the process of compressing fluid, contact forces between gears and external devices are unavoidable. However, the extra pressure reduces compression efficiency or wears down the gear teeth due to fluid leakage. At the same time, the extra pressure leads to generation of noise and overheating, thereby deteriorating the lubricating oil.

It is therefore an object of the present invention to provide a compression unit and a compressor having the same, capable of reducing the extra contact force applied unevenly to the cylinder when the volume of the space formed by the contact between the two gears changes , the cylinder supports the gear during the process of compressing the fluid.

To achieve these and other advantages and in accordance with the objects of the present invention, as embodied and broadly described herein, there is provided a compression unit comprising: a cylinder block including a gear insertion hole; an external gear on its inner peripheral surface A plurality of internal teeth are provided on the upper, and are inserted into the gear insertion hole in a rotatable manner; the internal gear, having a plurality of external teeth less than the number of internal teeth of the external gear, is embedded in the external gear, and forms a plurality of internal teeth with the external gear a compression space; upper and lower bearings axially and rotatably supporting both ends of the cylinder block; a suction fluid passage formed on the bearing for supplying fluid to the compression space; a discharge fluid passage formed on the bearing for to discharge fluid from the compression space; and contact support means inserted into the cylinder block and contact supported on the outer circumferential surface of the external gear.

To achieve these and other advantages and in accordance with the objects of the present invention, as embodied and broadly described herein, there is also provided a compressor comprising: a motor unit for rotating a drive shaft by generating a driving force; a compression unit for receiving The driving force generated by the motor unit compresses the fluid, thereby rotating the internal gear and the external gear; and a contact supporting device, inserted into the compression unit, supports the external gear by contacting the external circumferential surface of the external gear.

The above and other objects, features, aspects and advantages of the present invention will be more apparent from the ensuing detailed description of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

In the picture:

Figure 1 is a cross-sectional view showing an embodiment of a gear-type compression unit consistent with the prior art;

Fig. 2 is a cross-sectional view showing a gear-type compression unit according to an embodiment of the present invention;

Fig. 3 is a graph showing the maximum value of the force applied to the outer circumferential surface of the external gear corresponding to each position;

Fig. 4 is a cross-sectional view showing a cylinder block according to a second embodiment of the present invention;

Fig. 5 is a sectional view showing a gear type compression unit according to a second embodiment of the present invention.

Detailed ways

Reference will be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.

Hereinafter, a compression unit and a compressor having the same will be explained in detail with reference to the accompanying drawings.

Obviously, the compressor may include a compression unit, and the compressor may be used in a device using a refrigeration system, such as a refrigerator, an air conditioner, a heat pump, and the like.

Fig. 2 is a sectional view showing a gear type compression unit according to an embodiment of the present invention.

The compression unit according to the present invention includes: a cylinder block 200, which includes a gear insertion hole; an external gear 200, which is provided with a plurality of internal teeth 250 on its inner circumferential surface, and is rotatably inserted into the gear insertion hole; the internal gear 100, a plurality of external teeth 150 having a number less than the number of internal teeth 250 of the external gear 200, embedded in the external gear 200, and forming a plurality of compression spaces with the internal teeth 250 of the external gear 200; upper and lower bearings (not shown) , to rotatably support both ends of the cylinder block in the axial direction; the suction fluid passage 400, formed on the bearing, is used to supply fluid to the compression space; the discharge fluid passage 500, formed on the bearing, is used to discharge fluid from the compression space and a contact support device 600 inserted into the cylinder block 300 and supported by contact on the outer circumferential surface of the external gear 200 .

The internal gear 100 is formed in a ring shape, rotates by being connected to a driving shaft (not shown), and serves to transmit driving force generated by the motor unit. In a preferred embodiment, the number of external teeth 150 of the internal gear 100 is six. However, as long as the number is smaller than the number of internal teeth 250 of the external gear 200, the number of external teeth 150 of the internal gear 100 can be changed. The shape of the external teeth 150 of the internal gear 100 is various. However, the external teeth 150 of the internal gear 100 preferably have a cycloidal curve shape.

The external gear 200 is formed in a ring shape, and internal teeth 250 are provided on its inner circumferential surface, into which the external teeth 150 of the internal gear 100 are inserted. In a preferred embodiment, the number of internal teeth 250 of the external gear 200 is 7, which is more than the number of external teeth 150 of the internal gear 100 . When the internal gear 100 rotates, the external gear 200 receives a driving force to rotate together. The external gear 200 may be configured to be non-rotatable. When the internal gear 100 and the external gear 200 rotate together, moment balance is maintained to reduce vibration and noise. In particular, since the plurality of external teeth 150 and internal teeth 250 are in contact with each other, the force generated inside is not concentrated but dispersed. Meanwhile, when the internal gear 100 and the external gear 200 rotate together, the structure is simplified.

When the external teeth 150 of the internal gear 100 and the internal teeth 250 of the external gear 200 contact each other, a plurality of spaces are formed between the external teeth 150 and the internal teeth 250 . The center _O1 of the internal gear 100 is spaced apart from the center _O2 of the external gear 200 by a certain distance.

The cylinder block 300 is formed in a cylindrical shape and has a gear insertion space into which the external gear 200 is inserted at one end. A contact supporter insertion space connected to the gear insertion space and into which the contact supporter 600 is inserted is formed in the cylinder block 300 .

The shape of the internal teeth 250 is various. However, it is preferable that the internal teeth 250 are formed as three circular arcs having different curvatures combined with each other.

The cylinder block 300 has a space for accommodating the external gear 200 . The space for accommodating the external gear 200 has a ring-shaped cross-section, has a diameter slightly larger than that of the external gear 200, and has a gap into which oil can be introduced.

The upper and lower bearings for supporting the rotation of the gears and closing the space for inserting the gears to compress the fluid are arranged at both ends of the cylinder block 300 along the axis.

The suction fluid passage 400 is formed on the bearing, and supplies fluid to a space between the external teeth 150 of the internal gear 100 and the internal teeth 250 of the external gear 200 .

The suction fluid passage 400 is located in a region where the space between the teeth of the gear 100 and the external gear 200 gradually expands. That is, assuming that the internal gear 100 rotates in the clockwise direction, in the clockwise direction, in the region of 0° to 180° based on the point A that is farthest from the center _O1 of the internal gear on the outer circumference of the external gear 20, The space between the teeth of the internal and external gears expands. Therefore, the suction fluid channel 400 is preferably formed in the expansion area. In the expansion area where the closed space between the teeth of the internal gear and the external gear expands, the pressure is relatively low, and fluid suction is performed stably.

The discharge fluid channel 500 is located on the bearing and discharges compressed fluid. The discharge fluid passage is preferably located at a position where the space between the teeth of the inner gear and the outer gear contracts to compress the fluid to a certain pressure.

The contact supporter 600 is formed in a cylindrical shape with a certain height and diameter to be in line contact with the outer circumferential surface of the external gear 200 . The contact supporting device 600 is inserted into the cylinder block 300, and its outer circumferential surface is in contact with the outer circumferential surface of the external gear 200 at the contact point B, thereby being supported.

The contact supporter 600 may be formed in a spherical shape to be in point contact with the outer circumferential surface of the external gear 200 . The contact supporting device 600 may be filled with a plurality of spherical balls, thereby having a plurality of contact points with the outer circumferential surface of the external gear 200 .

At this time, it is preferable that the contact supporting means 600 protrudes toward the external gear 200 within a range smaller than the gap between the outer circumferential surface of the external gear 200 and the inner circumferential surface of the cylinder block 300 , thereby contacting the external gear 200 . If the contact supporting means 600 protrudes excessively toward the external gear 200, unnecessary friction and wear may be caused. Also, if the contact support device 600 protrudes too little toward the external gear 200, there is no point in installing the contact support device 600 . Thus, the contact supporting means protrudes within a range smaller than the gap between the outer peripheral surface of the external gear 200 and the inner peripheral surface of the cylinder block 300 , thereby coming into contact with the external gear 200 .

The contact support device 600 is preferably located at a position where the operational force between the external gear 200 and the cylinder block 300 is minimum. The operation force is obtained by adding the contact force between the internal gear 100 and the external gear 200 to the support force between the external gear 200 and the cylinder block 300 . That is, the contact point B between the contact supporting device 600 and the external gear 200 is preferably located at a position where the minimum operating force is applied when the contact supporting device 600 is not installed. At the contact point B, the contact supporting means 600 and the external gear 200 are continuously in contact with each other. That is, the contact supporting device 600 is inserted into the cylinder block 300 to be in contact with the external gear 200 at a position where the minimum operating force is applied, thereby supporting the external gear 200 .

The position where the minimum operating force is applied is mainly a region where the fluid suction process is performed, and is a region corresponding to 0° to 180° in the counterclockwise direction based on point A.

Fig. 3 is a graph showing the maximum value of the force applied to the outer circumferential surface of the external gear corresponding to each position.

The horizontal axis of the graph represents angles measured at each position of the outer circumferential surface of the external gear 200 in the clockwise direction on the basis of a point A farthest from the center _O1 of the internal gear 100 . Meanwhile, the vertical axis of the graph represents a value between the maximum value of the contact force between the internal gear 100 and the external gear 200 and the maximum value of the support force between the external gear 200 and the cylinder block 300 . As the gear rotates, the contact and support forces vary asynchronously, so the vertical axis of the graph gives the maximum value.

As shown in the figure, the contact force between the internal gear 100 and the external gear 200 is relatively constant as a small force between 45° and 135°. On the contrary, the supporting force between the external gear 200 and the cylinder block 300 is relatively small at 120°-150°. Therefore, the value between the contact force and the support force is the smallest at 120°-150°, so it is preferable to insert the contact support device 600 at 120°-150°.

When the internal gear 100 rotates in the clockwise direction, as in the preferred embodiment, the contact support device 600 is preferably located counterclockwise with the point A farthest from the center _O1 of the internal gear 100 on the outer circumference of the external gear 200 as a reference. Between 120° and 150° of the direction. However, when the internal gear 100 rotates in the counterclockwise direction, the contact support device 600 is preferably located at 120 in the clockwise direction based on the point A that is farthest from the center _O1 of the internal gear 100 on the outer circumference of the external gear 200. °～150°.

4 is a sectional view showing a cylinder block according to a second embodiment of the present invention, and FIG. 5 is a sectional view showing a gear type compression unit according to a second embodiment of the present invention.

As shown, the inner circumference of cylinder block 300 has two different radii. In a preferred embodiment, two different radii are defined as R30 and R31. However, there are various options for the radius.

The contact point between the contact support device 600 and the external gear 200 is preferably located on the inner circumference of the cylinder block 300 having a larger radius. That is, in order to maintain a more continuous contact between the external gear 200 and the contact supporting device 600 inserted into the cylinder block 300 , the external gear 200 moves toward the contact supporting device 600 . Therefore, the external gear 200 may come into contact with the cylinder block 300 more frequently.

It is obvious that it is possible to construct a compressor having the compression unit described above.

The compressor generally includes a motor unit to generate driving force, and a compression unit to compress gas by receiving the driving force of the motor unit. When the driving force is generated at the motor unit using the applied power, the driving force is transmitted to the compression unit, and thereby sucks, compresses, and discharges gas.

The compression unit includes: a cylinder block 300, which includes a gear insertion hole; an external gear 200, which is provided with a plurality of internal teeth 250 on its inner circumferential surface, and is rotatably inserted into the gear insertion hole; an internal gear 100, which has less than A plurality of external teeth 150 of the number of internal teeth 250 of the external gear 200 are embedded in the external gear 200 and form a plurality of compression spaces with the internal teeth 250 of the external gear 200; upper and lower bearings support the cylinder in a rotatable manner in the axial direction Both ends of the body; suction fluid passage 400, formed on the bearing, used to supply fluid to the compression space; discharge fluid passage 500, formed on the bearing, used to discharge fluid from the compression space; and contact support device 600, inserted into the cylinder block 300 and is supported on the outer circumferential surface of the external gear 200 in contact.

Hereinafter, the operation and effect of the present invention are explained.

When the internal gear 100 rotates to compress fluid, the external gear 200 receiving the driving force rotates, and the outer peripheral surface of the external gear 200 is in contact with the inner peripheral surface of the cylinder block 300 , thereby being supported. In the prior art, during the process of compressing the fluid, the direction and magnitude of the force applied in the radial direction differs according to the positions of the internal gear 100 and the external gear 200 . Therefore, the position of the contact point between the external gear 200 and the cylinder block 300 and the magnitude of the contact force applied to the contact point are continuously changed.

However, in the present invention, the contact supporting means 600 is kept in contact with the external gear 200 at the contact point B, thereby continuously contact supporting the external gear 200 . Therefore, the contact between the contact supporting device 600 and the external gear 200 is limited on the outer circumferential surface of the external gear 200 except for the contact point B. Referring to FIG. Since the contact support device 600 is located between the external gear 200 and the cylinder block 300 where the minimum force is applied, the contact support device 600 can support the external gear 200 with the minimum force.

Industrial Applicability

In the compression unit and the compressor having the same, the contact support device is inserted into the cylinder block at a position where the minimum contact force is applied to the point of contact between the external gear and the cylinder block, thereby using External gears are supported with minimal contact force.

That is, since the contact supporting device 600 and the external gear 200 are in contact with each other only at the contact point B, an additional contact force between the external gear 200 and the cylinder block 300 that may be generated during fluid compression is prevented. specific location. Therefore, wear and overheating of the gears and cylinder block can be prevented.

Also, since wear and damage of gear teeth can be prevented, reduction in compression efficiency due to fluid leakage, generation of noise, and deterioration of lubricating oil due to overheating can be prevented.

Also, in the compression unit and the compressor having the unit, it is possible to avoid an additional contact force that may be generated between the external gear and the cylinder block at a certain position during the compression of the fluid. Therefore, wear and overheating of the gears and cylinder block can be prevented.

Since the present invention has been embodied in several forms without departing from the spirit or essential characteristics, it is to be understood that the above-described embodiments are not limited to the details described above unless otherwise specified, but rather may be used within the spirit and scope of the appended claims. All changes and modifications are therefore within the metes and bounds of the claims, or equivalents encompassed by the appended claims.

Claims (14)

1. a compression unit comprises:

Cylinder block wherein has the gear patchhole;

External gear, portion's circumferential surface is provided with a plurality of internal tooths within it, and inserts the gear patchhole in rotatable mode;

Internal gear has a plurality of external tooths of the number of the internal tooth that is less than external gear, embeds external gear, and forms a plurality of compression volumes with the internal tooth of external gear;

Upper and lower bearing is vertically with the two ends of rotatable mode support cylinder body;

Suck the fluid passage, be formed on the bearing, be used for to the compression volume accommodating fluid;

Discharge flow channel is formed on the bearing, is used for from the compression volume exhaust fluid; With

The contact support device, the insertion cylinder block also is touched on the outer circumferential surface that is supported on external gear.

2. compression unit as claimed in claim 1, the number that it is characterized in that the external tooth of internal gear is 6, the number of the internal tooth of external gear is 7.

3. compression unit as claimed in claim 1 is characterized in that cylinder block has the gear that is used for inserting gear and inserts the space, and has and be connected in gear and insert the space and be used for holding the contact support device insertion space that contact support device.

4. compression unit as claimed in claim 1 is characterized in that cylinder block has the inner circumference of being made up of two different radiis.

5. compression unit as claimed in claim 1, the point of contact that it is characterized in that contacting between support device and the external gear is positioned at the inner circumference that has than the cylinder block of long radius.

6. compression unit as claimed in claim 1, it is characterized in that contacting support device is ball.

7. compression unit as claimed in claim 1, it is characterized in that contacting support device is a plurality of balls.

8. compression unit as claimed in claim 1, it is characterized in that contacting support device is the cylinder with certain altitude and diameter.

9. compression unit as claimed in claim 1 is characterized in that contacting the position of support device between external gear and cylinder block, in this position operation power minimum.

10. compression unit as claimed in claim 2 is characterized in that contacting support device and is positioned at being benchmark, 120 °～150 ° position counterclockwise with the center of internal gear from farthest point on the exterior periphery of external gear.

11. compression unit as claimed in claim 2 is characterized in that contacting support device and is positioned at being the position of 120 °～150 ° of benchmark, clockwise direction from farthest point with the center of internal gear on the exterior periphery of external gear.

12. compression unit as claimed in claim 1, it is outstanding to external gear in a scope to it is characterized in that contacting support device, and this scope is less than the gap between the inner circumferential of the exterior periphery of external gear and cylinder block, thereby contacts with external gear.

13. a compressor comprises:

Electric motor units is by producing the driving force rotating driveshaft;

Compression unit, by receiving the driving force compressed fluid that produces by electric motor units, and rotary internal gear and external gear thus; With

The contact support device, it inserts compression unit, supports external gear by contacting with the outer circumferential surface of external gear.

14. compressor as claimed in claim 13 is characterized in that compression unit comprises:

Cylinder block wherein has the gear patchhole;

External gear, portion's circumferential surface is provided with a plurality of internal tooths within it, and inserts the gear patchhole in rotatable mode;

Internal gear has a plurality of external tooths of the number of the internal tooth that is less than external gear, embeds external gear, and forms a plurality of compression volumes with the internal tooth of external gear;

Upper and lower bearing is vertically with the two ends of rotatable mode support cylinder body;

Suck the fluid passage, be formed on the bearing, be used for to the compression volume accommodating fluid;

Discharge flow channel is formed on the bearing, is used for from the compression volume exhaust fluid; With

The contact support device, the insertion cylinder block also is touched on the outer circumferential surface that is supported on external gear.

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