JP2001214873A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly efficient scroll compressor capable of reducing the dead volume without increasing a delivery pressure loss by arranging a recessed part for communicating with a delivery hole in a delivery port, shortening the length of the delivery hole more than the thickness of an end plate of a fixed scroll, and arranging a delivery valve in an opening part of the delivery hole. SOLUTION: In this scroll compressor where an electric motor and a compression part are arranged in a sealed vessel, and in the compression part, a compression space is formed by mutually meshing the fixed scroll 4 and a turning scroll 6 having spiral laps 4b, 6b on the end plate, compressed gas is delivered to a delivery chamber 15 by pressure from the delivery port 14 via the delivery hole 14a arranged in the central part vicinity of the fixed scroll 4, and the delivery valve 17 is arranged in the delivery port 14 for preventing a backflow of the gas to the compression space from the delivery chamber 15, the recessed part 14b for communicating with the delivery hole 14a is arranged in the vicinity of the delivery port 14, and while the length of the delivery hole 14a is shortened more than the thickness of the end plate 14a of the fixed scroll 4, the delivery valve 17 is arranged in the opening part of the delivery hole 14a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor and, more particularly, to a structure for mounting a discharge valve provided between communication passages between discharge holes.

[0002]

2. Description of the Related Art A conventional scroll compressor will be described in detail with reference to FIG. The scroll compressor has an electric motor 2 and a compression unit 3 built in a closed container 1, and the compression unit 3 includes a fixed scroll 4, an orbiting scroll 6,
Oldham ring 7, crankshaft 8, eccentric bearing 12, bearing 1
1, mainly composed of a shaft 10. In this configuration, a fixed scroll wrap in a spiral shape is attached to the fixed head plate 4a.
4b is formed integrally with the fixed scroll 4 fixed to the bearing 11
And a orbiting scroll 6 in which a swirling orbiting scroll wrap 6b and a orbiting drive shaft 6c are integrally formed on the orbiting end plate 6a.
Are engaged with the orbiting scroll wrap 6b inside to form a plurality of compression chambers 5.

When the electric motor 2 rotates, the main frame 11
The orbiting scroll 6 is caused to orbit by the orbiting drive shaft 6c via the eccentric bearing 12 fitted to the crankshaft 8 formed at the tip of the shaft 10 attached to the shaft 10 while preventing rotation by the Oldham ring 7. The low-pressure refrigerant sucked into the compression section 3 from the suction pipe 13 by the orbiting movement of the orbiting scroll 6 is compressed while moving sequentially from the outer periphery to the center of the compression chamber 5 to become a high-pressure refrigerant gas. The discharge valve 17 'is opened by the pressure from the discharge port 14' through the discharge port 15 'and discharged into the discharge chamber 15, and is discharged from the discharge pipe 16 to the outside of the closed casing 1 via the electric motor chamber 2a.

In the above structure, immediately after the compressor is stopped, the high-pressure refrigerant gas discharged from the discharge chamber 15 flows back into the compression chamber 5 having a pressure lower than the high pressure, thereby rotating the orbiting scroll 6 backward.
A loud impact sound is generated. In order to prevent this, a discharge valve 17 'is provided at the discharge port 14' of the fixed scroll 4. The discharge valve 17 'is made of an elastic plate, and has a configuration in which one end in the longitudinal direction is fixed to the fixed scroll 4 by a valve fixing bolt or the like, and the discharge valve 17' is opened and closed by pulsation according to a gas flow. It is supposed to repeat.

However, when the diameter of the discharge hole 14a 'is increased, the discharge pressure loss (pressure loss) is reduced.
The dead volume of 14a ', that is, the volume of the flow path that does not contribute to the compression performance increases, and the compression efficiency decreases. Also, in order to reduce the dead volume, if the diameter of the discharge hole 14a 'is reduced, the discharge pressure loss increases, and if the length of the discharge hole 14a' is shortened, the thickness of the fixed end plate 4a of the fixed scroll 4 decreases, and the strength decreases. There was a problem that there was a shortage.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a discharge port provided with a concave portion communicating with the discharge hole, and the length of the discharge hole is shorter than the thickness of the end plate of the fixed scroll. On the other hand, an object of the present invention is to provide a highly efficient scroll compressor in which a discharge valve is provided at an opening of a discharge hole and a dead volume can be reduced without increasing discharge pressure loss.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises an electric motor and a compression section arranged in a closed container, and the compression section has a spiral wrap on a head plate. A fixed scroll, an orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers, and a gas compressed from a discharge port through a discharge hole provided near the center of the fixed scroll by pressure. A scroll compressor that discharges to a discharge chamber and has a discharge valve disposed at the discharge port to prevent backflow of gas from the discharge chamber to the compression chamber, wherein the discharge port has a recess communicating with the discharge hole. In addition, the length of the discharge hole is made shorter than the thickness of the end plate of the fixed scroll, and the discharge valve is provided in the opening of the discharge hole.

[0008] Further, the diameter of the discharge port is larger than the diameter of the discharge hole.

Further, the discharge valve is configured to use a check valve made of an elastic material.

Further, the discharge valve is provided so as to be inclined from the end of the discharge port toward the inside of the recess.

[0011] Further, a valve press is provided on the back side of the discharge valve.

Further, the recess and the ejection hole have the same central axis.

The discharge valve is provided at a valve portion for opening and closing the discharge hole, a fulcrum consisting of a hinge for rotating the discharge valve up and down at an end of the discharge port, and a rear end of the discharge valve. The valve unit opens the valve by the discharge pressure, and closes the valve by the gravity of the weight after the compression is completed.

Further, a fulcrum composed of the hinge is provided at a central portion of the discharge valve. It should be noted that the valve portion has a configuration using a needle valve.

[0015]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of a scroll compressor showing one embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part according to the first embodiment of the present invention. In the figure, an electric motor 2 and a compression unit 3 are arranged on the left and right inside a closed container 1, and the compression unit 3 is engaged with the spiral fixed scroll 4 and the fixed scroll 4 to form a plurality of compression chambers 5.
, A Oldham ring 7 for preventing the orbiting scroll 6 from rotating, and a crankshaft 8 formed at the lower end of the orbiting drive shaft 6c of the orbiting scroll 6 for orbital driving, and penetrating from the upper end to the lower end. A scroll compressor is composed of a shaft 10 having a lubricating oil supply passage 9 formed therein, a main frame 11 for supporting the crankshaft 8 and an eccentric bearing 12.

In this configuration, a fixed scroll wrap 4b having a spiral shape is integrally formed on the fixed end plate 4a, and the fixed scroll 4 pressed against the main frame 11; Swivel drive shaft on back
The orbiting scroll 6 integrally formed with the orbiting scroll 6c is engaged with the orbiting scroll wrap 6b inside to form a plurality of compression chambers 5.

The low-pressure refrigerant sucked into the compression section 3 from the suction pipe 13 by the orbiting motion of the orbiting scroll 6 is compressed while moving sequentially from the outer periphery to the center of the compression chamber 5 to become a high-pressure refrigerant gas, and the refrigerant gas is discharged. Discharge port 14 via hole 14a
The discharge valve 17 is opened by the pressure from the outlet and discharged into the discharge chamber 15 and discharged from the discharge pipe 16 to the outside of the closed container 1.

The discharge port 14 is provided with a concave portion 14b communicating with the discharge hole 14a, and the length of the discharge hole 14a is made shorter than the thickness of the end plate 4a of the fixed scroll 4.
The discharge valve 17 is provided at the opening of the discharge hole 14a.

The hole diameter of the discharge port 14 is
A larger diameter than the hole diameter of a, and a check valve made of an elastic plate such as a spring material is used for the discharge valve 17, and one end in the longitudinal direction is fixed to the end of the discharge port 14, while the discharge valve 17 is The discharge port 14 is provided so as to be inclined from the end to the inside of the recess 14b. Further, a valve retainer 18 is provided on the back side of the discharge valve 17.

In the above configuration, the diameter of the discharge hole 14a is the same as the conventional one and the length is shortened, so that the volume of the discharge hole 14a can be reduced and the dead volume can be reduced. Further, since the length of the discharge hole 14a is shortened,
The scroll compressor can also reduce the discharge pressure loss (pressure loss) and improve the compression efficiency.

FIG. 3A shows a second embodiment according to the present invention, wherein the recess 14b and the discharge hole 14a have the same central axis, and the discharge valve 17 opens and closes the discharge hole 14a. A valve part 17a, a fulcrum 17b at the end of the discharge port 14 which is a hinge for rotating the discharge valve 17 up and down, and a weight 17c provided at a rear end of the discharge valve 17; Part 17a
Opens the valve by the discharge pressure, and after the compression is completed, the weight 17c
The valve is closed by gravity.

In the above configuration, since a leaf spring or the like is not used, there is no breakage due to the warp, so that a valve press is not required. Further, since the spring force does not act to return, the seating sound when the valve portion 17a is seated on the fixed scroll 4 can be reduced. Similarly, since there is no valve press, there is no collision sound.

FIG. 3B shows a third embodiment according to the present invention, in which a fulcrum 17b provided by a hinge is provided at the center of the discharge valve 17, and performs the same operation as in the second embodiment.

FIG. 4A shows a fourth embodiment according to the present invention, wherein the valve portion 17a is constituted by a needle valve.
The opening and closing of the valve can be reliably performed, and the degree of sealing of the discharge hole 14a can be improved.

FIG. 4B shows a fifth embodiment according to the present invention, in which a discharge valve 17 is provided in parallel with the opening of the discharge hole 14a, and the discharge valve 17 and the valve retainer 18 are accommodated in a recess 17b. With the configuration, the sitting sound and the collision sound can be further reduced.

As described above, the concave portion 14b communicating with the discharge hole 14a is provided near the discharge port 14, and
While the length of the discharge hole 14a is made shorter than the thickness of the end plate 4a of the fixed scroll 4, the discharge valve 17 is provided at the opening of the discharge hole 14a, and the dead volume can be reduced without increasing the discharge pressure loss, thereby achieving high efficiency. A scroll compressor that can drive and reduce sitting noise and collision noise.

[0027]

As described above, according to the present invention, a recess communicating with the discharge hole is provided in the vicinity of the discharge port, and the length of the discharge hole is made shorter than the thickness of the end plate of the fixed scroll. The scroll compressor is provided at the opening of the hole, can reduce the dead volume without increasing the discharge pressure loss, can operate with high efficiency, and can further reduce the sitting sound and the collision sound.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing the first embodiment of the present invention.

FIG. 3A is an enlarged sectional view of a main part showing a second embodiment of the present invention, and FIG. 3B is an enlarged sectional view of a main part showing a third embodiment.

FIG. 4A is an enlarged sectional view of a main part showing a fourth embodiment of the present invention, and FIG. 4B is an enlarged sectional view of a main part showing a fifth embodiment.

FIG. 5 is a longitudinal sectional view of a scroll compressor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor 3 Compressor 4 Fixed scroll 4a Fixed end plate 4b Fixed scroll wrap 5 Compression chamber 6 Orbiting scroll 6a Orbiting end plate 6b Orbiting scroll wrap 6c Orbital drive shaft 7 Oldham ring 8 Crankshaft 9 Lubricating oil passage 10 Shaft 11 Main Frame 13 Suction pipe 14 Discharge port 14a Discharge hole 14a Recess 15 Discharge chamber 16 Discharge pipe 17 Discharge valve 18 Valve retainer

Claims (9)

[Claims] 1. An electric motor and a compression unit are arranged in a closed container,
A fixed scroll having a spiral wrap on the end plate; a orbiting scroll which meshes with the fixed scroll to form a plurality of compression chambers; and a discharge hole provided near the center of the fixed scroll. Scroll compressor having a discharge valve for discharging gas compressed from a discharge port to a discharge chamber by pressure through the discharge port and preventing a reverse flow of gas from the discharge chamber to the compression chamber at the discharge port. In the above, the discharge port is provided with a concave portion communicating with the discharge hole, and the length of the discharge hole is shorter than the thickness of the end plate of the fixed scroll, while the discharge valve is provided in the opening of the discharge hole. A scroll compressor characterized by the above-mentioned. 2. The scroll compressor according to claim 1, wherein a hole diameter of said discharge port is made larger than a hole diameter of said discharge hole. 3. The scroll compressor according to claim 1, wherein a check valve made of an elastic material is used as the discharge valve. 4. The scroll compressor according to claim 1, wherein the discharge valve is provided so as to be inclined from the end of the discharge port toward the inside of the recess. 5. The scroll compressor according to claim 1, wherein a valve press is provided on the back side of said discharge valve. 6. The scroll compressor according to claim 1, wherein the central axis of the concave portion and the central axis of the discharge hole are the same. 7. The discharge valve is provided at a valve portion that opens and closes the discharge hole, a fulcrum consisting of a hinge that rotates the discharge valve up and down at an end of the discharge port, and a rear end of the discharge valve. And the valve unit opens the valve by the discharge pressure,
2. The scroll compressor according to claim 1, wherein the valve is closed by gravity of the weight after the compression is completed. 8. The scroll compressor according to claim 1, wherein a fulcrum composed of the hinge is provided at a central portion of the discharge valve. 9. The scroll compressor according to claim 1, wherein a needle valve is used for the valve section.