JP2002235667A - Refrigerant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of compression efficiency caused by heating of a part constituting a delivery passage in a sealed container 21 by a refrigerant gas which is heated by compression, resulting temperature rise of whole of a refrigerant compressor and temperature rise of refrigerant gas taken in. SOLUTION: The delivery gas passage from a delivery chamber to a delivery pipe in the sealed container is thermally insulated, and the temperature rise of whole of the refrigerant compressor is retrained. Thus, the refrigerant gas taken in is not heated and the efficiency of the refrigerant compressor can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic refrigerant compressor used in a refrigerating cycle of a refrigerator or the like, and more particularly to a reciprocating refrigerant compressor having improved performance by preventing heating of a suction refrigerant gas.

[0002]

2. Description of the Related Art Refrigeration systems such as refrigerators and refrigeration showcases are provided with a refrigeration cycle, and a refrigerant compressor, which is a closed electric compressor, is used in the refrigeration cycle. The refrigerant compressor sucks and compresses low-temperature and low-pressure refrigerant gas, and discharges the high-temperature and high-pressure refrigerant gas to the refrigeration cycle.

[0003] The configuration and operation of a conventional refrigerant compressor will be described with reference to FIGS. 4 and 5.

FIG. 4 is a plan sectional view of a conventional refrigerant compressor, and FIG. 5 is a sectional view of a conventional compressor section. In the figure, 1 is a compressor unit, 2 is a cylinder formed on the main body 8, and 3 is a piston. Reference numeral 4 denotes a valve seat plate, which is provided with a discharge hole 5 and a suction hole 6, and 7 is a discharge valve.
A suction valve 10 opens and closes the suction hole 6.

[0005] Reference numeral 15 denotes a cylinder head, and 14 denotes a head gasket provided between the cylinder head 15 and the valve seat plate 4. Further, a discharge chamber 12 is formed by the cylinder head 15 and the valve seat plate 4, and the suction chamber 13 is connected to an insertion hole 16 provided in the cylinder head 15 at a position corresponding to the suction hole 6 of the valve seat plate 4. It is formed in the suction muffler 17.

Reference numerals 9a and 9b denote discharge mufflers formed in the main body 8 of the compressor section 1. The discharge chamber 12 and the discharge muffler 9a are connected by a discharge passage 18 communicating with a gas hole 11 provided in a valve seat plate. The mufflers 9a and 9b are connected by a communication passage 24, and a discharge pipe 20 is connected from a cap 19b of the discharge muffler 9b through a closed container 21.

The operation of the conventional refrigerant compressor configured as described above will be described below. The piston 3 reciprocates in the cylinder 2. First, when the piston 3 retreats, the pressure in the compression chamber 22 formed in the cylinder 2 decreases, and the discharge valve 7 closes and the suction valve 10 opens, so that the refrigerant The gas is drawn from the suction chamber 13 of the suction muffler 17 into the compression chamber 22 through the suction hole 6.

Next, as soon as the piston 3 starts to move forward, the pressure in the compression chamber 22 starts to rise, so that the suction valve 10 is closed, the refrigerant gas in the compression chamber 22 is compressed, and the refrigerant gas in the compression chamber 22 and the discharge chamber 12 is compressed. When the pressure difference reaches a predetermined value, the discharge valve 7 opens, and the refrigerant gas in the compression chamber 22 passes through the discharge hole 5 and flows into the discharge chamber 1.
2 is discharged.

The refrigerant gas discharged into the discharge chamber 12 passes through the gas holes 11 of the valve seat plate 4 and the discharge passages 18 provided in the main body 8, reaches the discharge mufflers 9a and 9b, and passes through the discharge pipe 20 connected thereto. It is discharged to a refrigeration cycle (not shown).

[0010]

However, in the above configuration, the compressed and high-temperature refrigerant gas heats each part constituting the discharge gas passage of the compressor part, and further flows through the discharge pipe. Heating the atmosphere in the closed container, thereby increasing the temperature of the entire refrigerant compressor. Accordingly, the suctioned refrigerant gas is also heated under the influence of the influence and the temperature rises, resulting in a decrease in compression efficiency. was there.

The present invention solves such a problem, and heat of a high-temperature refrigerant gas is sucked in through each component constituting a passage of a discharge gas from a discharge chamber of a cylinder head to a closed container. It is an object of the present invention to provide a refrigerant compressor having improved compression efficiency by preventing heating of a refrigerant gas.

[0012]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a motor unit and a compressor connected to the motor unit via a rotary shaft in a closed container storing refrigerating machine oil. And a compressor unit disposed with the rotation axis in the vertical direction and having a discharge pipe communicating with the discharge chamber of the compressor unit and penetrating the sealed container. By insulating the discharge gas passage to the discharge pipe in the container, the temperature rise of the entire refrigerant compressor is suppressed, so that the suction refrigerant gas is not heated, and the refrigerant gas having a low temperature and high density is sucked into the compression chamber. Is what you can do.

According to a second aspect of the present invention, the discharge chamber and the discharge muffler integrally formed in the compressor section and the passage for communicating the discharge chamber and the discharge muffler are provided with a heat insulating layer on an inner wall thereof. This can prevent the passage from being heated.

According to a third aspect of the present invention, a heat insulating layer is provided on the outer surface of the discharge pipe in the closed container or the muffler provided in the middle of the discharge pipe, thereby preventing heat radiation from the discharge pipe. You can do it.

According to a fourth aspect of the present invention, the heat insulating layer comprises:
By molding materials such as synthetic resin,
A heat insulating structure can be easily obtained.

According to a fifth aspect of the present invention, the heat insulating layer comprises:
By coating or covering an elastic material made of rubber, synthetic resin, or the like, a heat insulating layer can be easily formed.

According to a sixth aspect of the present invention, the heat insulating layer provided on the inner wall of the cap of the discharge muffler is formed integrally with the sealing member of the cap, thereby providing both heat insulating and sealing.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a refrigerant compressor according to the present invention will be described with reference to the drawings. The description of the same configuration as the conventional example is omitted.

FIG. 1 is a plan sectional view of a compressor section according to an embodiment of the present invention, and FIG. 2 is a partial longitudinal sectional view of the compressor section. In the figure, reference numeral 23a denotes a heat insulating layer provided on the inner wall of the discharge chamber 12;
Reference numerals c and 23d denote heat insulating layers provided on the inner walls of the discharge mufflers 9a and 9b. The heat insulating layer 23b is also provided on the inner wall of the discharge passage 18 communicating from the discharge chamber 12 to the discharge muffler 9a.

The communication path 2 between the discharge mufflers 9a and 9b
The heat insulating layer 23 e is also provided on the inner wall of the discharge muffler 9.
A heat insulating layer 23f is provided on the outer surface of the discharge pipe 20 from a to the closed container 21.

In the present embodiment configured as described above,
The high-temperature refrigerant gas compressed in the compression chamber 22 passes through the discharge hole 5 of the valve seat plate 4, passes through the discharge chamber 12, the discharge passage 18, the discharge mufflers 9 a and 9 b, and the discharge pipe 20, and the sealed container 2 of the refrigerant compressor
The liquid is discharged to a refrigeration cycle (not shown) outside of FIG.

Here, the refrigerant gas to be discharged is formed by a discharge chamber and a discharge muffler integrally formed in a compressor portion forming the discharge passage, and a passage connecting these members to a material such as a synthetic resin on an inner wall thereof. Because it is equipped with a heat insulation layer molded, it can be prevented from being heated by the passage of high-temperature discharge gas,
Since the temperature rise of the compressor section can be suppressed, the refrigerant gas having a low temperature and a high density can be sucked into the compression chamber without being heated by the suction refrigerant gas passage provided in the compressor section, The volume efficiency of the compressor is improved.

Further, the cylinder 2 formed on the main body 8
Also, since it is possible to prevent the thermal effect of the discharge chamber and the discharge muffler integrally formed and the high-temperature discharge gas passing through the passage communicating therewith, it is possible to reduce deformation of the cylinder due to thermal strain, and to reduce the compression chamber. It is possible to improve sealing performance.

Also, a discharge pipe in a closed container or
Even in a structure with a discharge muffler in the middle of the discharge pipe, a heat insulating layer was easily formed by coating or coating an elastic material made of rubber or synthetic resin on the outer surface of the structure, so that a high-temperature discharge gas could be generated. The suction refrigerant gas, which is the atmosphere in the closed container, is sent to the compressor without being heated, so that the refrigerant gas having a low temperature and a high density is sucked into the compression chamber. And the volumetric efficiency of the refrigerant compressor is improved.

Further, by covering the discharge pipe with an elastic material, a vibration damping effect of absorbing the vibration of the pipe can be obtained, and it is possible to provide a highly reliable refrigerant compressor with low vibration and low noise. Become.

FIG. 3 is a detailed vertical sectional view of a discharge muffler portion according to an embodiment of the present invention. In the figure, reference numeral 9a denotes a discharge muffler provided on the main body 8, and 23c denotes a discharge muffler which is a heat insulating layer mounted on the inner wall of 9a. , 19a are caps of the discharge muffler 9a, which are fastened to the main body 8 by bolts,
5 and a sealing portion 26 for bolts. Reference numeral 27 denotes a heat insulating layer formed on the inner wall of the cap 19a, which is formed integrally with the sealing material of the sealing portion 25.

The structure of the heat insulating layer 27 can be easily achieved by coating or coating an elastic material such as rubber or a synthetic resin. The heat insulating layer having both heat insulation and sealing can be integrated with the cap and assembled. Work can be simplified.

Further, since the temperature rise of the entire refrigerant compressor can be suppressed by the structure of the present invention, a lower viscosity oil can be used as the refrigerating machine oil necessary for lubricating the compressor section.
This makes it possible to provide a high-efficiency refrigerant compressor with reduced power consumption.

[0029]

As described above, according to the first aspect of the present invention, an electric motor unit is provided in a closed container storing refrigerating machine oil.
A compressor unit connected to the motor unit via a rotating shaft,
In a refrigerant compressor provided with a rotation axis set in a vertical direction and communicating with a discharge chamber of the compressor section and penetrating the closed container, a discharge pipe in the closed container from the discharge chamber is provided. By insulating the discharge gas passage up to, the temperature rise of the entire refrigerant compressor is suppressed, so that the suction refrigerant gas is not heated, and the refrigerant gas having a low temperature and high density can be sucked into the compression chamber, This has the effect of improving the volumetric efficiency of the refrigerant compressor.

According to the second aspect of the present invention, the discharge chamber and the discharge muffler integrally formed in the compressor section and the passage communicating therewith are provided with a heat insulating layer on an inner wall thereof, so that the discharge chamber and the discharge muffler are provided with a heat insulating layer. Since the gas passage can be prevented from being heated and the temperature rise of the compressor section can be suppressed, it is possible to prevent the suction refrigerant gas from being heated.

According to the third aspect of the present invention, the heat radiation from the discharge pipe is prevented by providing the heat insulating layer on the outer surface of the discharge pipe in the closed container or the muffler provided in the middle of the discharge pipe. It is possible to prevent the heating of the atmosphere in the closed container.

According to the fourth aspect of the present invention, the heat insulating layer comprises:
By molding materials such as synthetic resin,
The heat insulating structure can be easily obtained, and the assembling operation can be simplified.

According to the fifth aspect of the present invention, the heat insulating layer comprises:
By coating or covering an elastic material made of rubber, synthetic resin, or the like, a heat insulating layer can be easily formed, and heat radiation prevention and vibration damping effects can be obtained.

According to the sixth aspect of the present invention, since the heat insulating layer provided on the inner wall of the cap of the discharge muffler is formed integrally with the sealing member of the cap, the heat insulating layer can have both heat insulating and sealing properties. Work can be simplified.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cross section of a main part of a refrigerant compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the refrigerant compressor according to the embodiment.

FIG. 3 is a detailed vertical sectional view of a discharge muffler section according to the embodiment.

FIG. 4 is a plan sectional view of a compressor section of a conventional refrigerant compressor.

FIG. 5 is a vertical sectional view of the refrigerant compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor part 2 Cylinder 3 Piston 4 Valve seat plate 5 Discharge hole 7 Discharge valve 8 Main body 9a, 9b Discharge muffler 12 Discharge chamber 15 Cylinder head 18 Discharge passage 19a, 19b Cap 20 Discharge pipe 21 Closed container 23a to 23f Thermal insulation layer

Continuation of the front page (72) Kentaro Yamaguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Hiroyuki Matsumori 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Nobuo Komoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (Reference) 3H003 AA02 AB03 AC03 AD03 BF03 BF04 BF05

Claims (6)

[Claims] An electric motor unit and a compressor unit connected to the electric motor unit via a rotary shaft are disposed in a closed container storing the refrigerating machine oil with a rotation axis perpendicular to the motor unit. In a refrigerant compressor having a discharge pipe communicating with a discharge chamber of a mechanical unit and penetrating the sealed container, a refrigerant gas is insulated from a discharge gas passage from the discharge chamber to a discharge pipe in the sealed container. Compressor. 2. A discharge chamber and a discharge muffler integrally formed in the compressor section, and a passage for communicating the discharge chamber and the discharge muffler, wherein a heat insulating layer is provided on an inner wall thereof. Refrigerant compressor. 3. The refrigerant compressor according to claim 1, wherein a heat insulating layer is provided on an outer surface of a discharge pipe in the closed container or a muffler provided in the middle of the discharge pipe. 4. The refrigerant compressor according to claim 1, wherein the heat insulating layer is formed by molding a material such as a synthetic resin. 5. The refrigerant compressor according to claim 1, wherein the heat insulating layer is coated or coated with an elastic material made of rubber, synthetic resin, or the like. 6. The refrigerant compressor according to claim 1, wherein the heat insulating layer provided on the inner wall of the cap of the discharge muffler is formed integrally with a seal member of the cap.