JP2003049774A - Hermetic electric compressor and refrigerating/air- conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise and vibration by reducing pressure pulsation of discharge gas in a hermetic electric compressor. SOLUTION: The hermetic electric compressor comprises a closed container 14, a compression element disposed in the closed container 14, a cylinder 1 forming a working chamber 13 of the compression element, a piston 2 movable in the cylinder 1 to form the working chamber 13 together with the cylinder 1, a discharge valve 9 for opening and closing a discharge opening 8a of the working chamber 13, and a discharge chamber member 10 having a discharge chamber 10a formed on a discharge side of the discharge valve 9. A volume varying means 50 is provided to vary the volume of the discharge chamber 10a according to pressure pulsation of discharge gas discharged into the discharge chamber 10a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically-sealed electric compressor and a refrigerating / air-conditioning apparatus, and more particularly to a refrigerating / air-conditioning apparatus such as a refrigerator or an air-conditioner and a hermetically-sealed electric compressor incorporated therein. is there.

[0002]

2. Description of the Related Art A reciprocating hermetic electric compressor in which a working fluid is moved by a piston repeatedly reciprocating in a cylindrical cylinder has long been known as a positive displacement fluid machine.

As a conventional hermetic electric compressor of this type, as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 5-10260, a hermetically sealed container is used in order to reduce the pulsation of the discharged gas and reduce the noise. And a compression element arranged in a closed container, a discharge chamber of the compression element, a communication pipe connecting the discharge chamber and the discharge muffler, and a flexible cap that expands and contracts due to pressure pulsation. There is one in which a flexible cap is provided and the flexible cap and the communication pipe are connected with a gap between the flexible cap inlet and the communication pipe outlet.

[0004]

The hermetic electric compressor is required to have a small discharge gas pulsation and low noise and vibration, and the required level is becoming stricter year by year. In addition, due to the widening of the compressor operating range due to the recent inverter control, it is necessary to improve the performance of the compressor as well as the noise and vibration in a wide range of the rotational speed of the compressor.

However, in the above-described conventional hermetic electric compressor, since the flexible cap is provided inside the discharge chamber connected to the discharge muffler through the communication pipe, the cylinder having the largest discharge pulsation is used. There is a problem that the discharge pulsation is reduced at a great distance from the discharge portion, and the pulsation reduction effect is low.

Further, this flexible cap is intended to reduce pulsation in a predetermined operating state, and no consideration is given to reducing the peak value of the discharge pressure over the region where the compressor rotational speed changes.

A first object of the present invention is to directly reduce the pressure pulsation of the discharge gas discharged from the working chamber, to provide low noise and low vibration, and a hermetic electric compressor and a refrigerating machine having excellent compressor performance. To provide an air conditioner.

A second object of the present invention is to provide a hermetically-sealed electric compressor which has a reduced discharge pressure peak value, low noise and low vibration, and excellent compressor performance over a region where the compressor rotational speed changes. To provide a machine and a refrigerating / air-conditioning system.

[0009]

[Means for Solving the Problems] A first means of the present invention for achieving the above first object is to provide a compression element provided in the closed container, and a cylinder forming a cylinder chamber of the compression element. A piston that moves in the cylinder chamber to form a working chamber together with the cylinder, a discharge valve that opens and closes a discharge port of the working chamber, and a discharge chamber member having a discharge chamber formed on the discharge side of the discharge valve. A volume changing means is provided for changing the volume of the discharge chamber of the discharge chamber member according to the pressure pulsation of the discharge gas discharged into the discharge chamber.

A second means of the present invention for achieving the above-mentioned first object is a closed container, a compression element provided in the closed container, a cylinder forming a cylinder chamber of the compression element, and A piston that moves in the cylinder chamber to form a working chamber together with the cylinder, a discharge valve that opens and closes a discharge port of the working chamber, a discharge chamber member having a discharge chamber formed on the discharge side of the discharge valve, and the discharge A discharge silencer communicating with the chamber, and a first volume changing means for changing the discharge chamber volume of the discharge chamber member in accordance with the pressure pulsation of the discharge gas discharged into the discharge chamber, and the discharge silencer inside the discharge silencer. The second volume changing means is provided for changing the volume of the discharge silencer chamber in accordance with the pressure pulsation.

The third means of the present invention for achieving the above first object is to provide a hermetic electric compressor, a condenser, a pressure reducing device,
And an air conditioner / refrigerating apparatus in which an evaporator is connected by a pipe to form a refrigeration cycle, the hermetic electric compressor includes a hermetic container, a compression element provided in the hermetic container, and a cylinder chamber of the compression element. A discharge having a forming cylinder, a piston that moves in the cylinder chamber to form a working chamber together with the cylinder, a discharge valve that opens and closes a discharge port of the working chamber, and a discharge chamber formed on the discharge side of the discharge valve. A chamber variable member is provided, and a volume varying means for varying the discharge chamber volume of the discharge chamber member according to the pressure pulsation of the discharge gas flowing into the discharge chamber is provided.

A fourth means of the present invention for achieving the above-mentioned second object is a closed container, a compression element provided in the closed container, an electric element for driving the compression element, and the compression element. A cylinder forming a cylinder chamber, a piston that moves in the cylinder chamber to form a working chamber together with the cylinder, and a discharge valve that opens and closes a discharge port of the working chamber,
A discharge chamber member having a discharge chamber formed on the discharge side of the discharge valve, and a drive device that variably drives the rotation speed of the electric element, are provided according to changes in the compressor rotation speed driven by the drive device. The volume varying means for varying the volume of the discharge chamber of the discharge chamber member is provided.

A fifth means of the present invention for achieving the above second object is a closed container, a compression element provided in the closed container, an electric element for driving the compression element, and the compression element. A cylinder forming a cylinder chamber, a piston that moves in the cylinder chamber to form a working chamber together with the cylinder, and a discharge valve that opens and closes a discharge port of the working chamber,
A discharge chamber member that has a discharge chamber formed on the discharge side of the discharge valve, a discharge silencer that communicates with the discharge chamber, and a drive device that variably drives the rotational speed of the electric element are driven by the drive device. A first volume changing means for changing the discharge chamber volume of the discharge chamber member in accordance with a change in the number of rotations of the compressor, and changing the discharge silencer chamber volume in accordance with the pressure pulsation in the discharge silencer. This is because the second volume varying means is provided.

A sixth means of the present invention for achieving the above second object is to provide a hermetic electric compressor, a condenser, a pressure reducing device,
And an air conditioner / refrigerator in which a evaporator is connected by a pipe to form a refrigeration cycle, the hermetic electric compressor includes a hermetic container, a compression element provided in the hermetic container, and an electric motor for driving the compression element. An element, a cylinder that forms a cylinder chamber of the compression element, a piston that moves in the cylinder chamber to form a working chamber with the cylinder, a discharge valve that opens and closes a discharge port of the working chamber, and a discharge valve of the discharge valve. A discharge chamber member having a discharge chamber formed on the discharge side, and a drive device that variably drives the rotation speed of the electric element, and the discharge chamber member according to a change in the compressor rotation speed driven by the drive device. The volume varying means for varying the volume of the discharge chamber is provided.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol in the figure of each embodiment shows the same thing or equivalent thing.

A hermetic electric compressor according to a first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 10. Figure 1
Is a longitudinal sectional view showing the hermetic electric compressor according to the first embodiment of the present invention, FIG. 2 is a transverse sectional view of the hermetic electric compressor, and FIG. 10 is an enlarged cross section of a cylinder discharge portion of the hermetic electric compressor. It is a figure.

A compression element and an electric element 6 are provided in an upper part and a lower part in the closed container 14, and both are connected by a drive shaft 5. The cylinder 1 that constitutes the compression element is positioned with respect to the piston 2 and is fixed to the main bearing member 3. The cylinder 1 accommodates one side of the piston 2 reciprocally in the cylinder chamber and forms a working chamber 13 together with the piston. A slide tube 2a is fixed to the other side of the piston 2. In the slider tube 2a portion of this piston 2,
The slider 4 is inserted slidably in the axial direction of the slider tube. The eccentric part of the drive shaft 5 is fitted into the hole 4a at the center of the slider 4. The eccentric part of the drive shaft 5,
The slider 4 and the slide tube 2a convert the rotational movement of the drive shaft 5 into the reciprocating movement of the piston 2.

A suction valve 7, a pump member 8 having a suction port (not shown) and a discharge port 8a, a discharge valve 9, and a retainer 9a (see FIG. 1) are provided at an end of the cylinder 1 opposite to the piston.
0), the mounting member 51 and the discharge chamber member 10 in which the discharge chamber 10a is formed are sequentially stacked and mounted in the piston sliding direction. The discharge chamber member 10 has a discharge port 8a.
The discharge chamber 10a is communicated with the discharge port 8a via the discharge valve 9 while being installed so as to cover the discharge chamber 10a. As a result, the discharge chamber 10a is compressed in the working chamber 13 and the discharge port 8a is compressed.
The discharge gas discharged from a is the discharge valve 9, the retainer 9a,
It is directly flowed in via the mounting member 51. The discharge chamber 10a constitutes an expansion chamber in the discharge gas discharge path.

Inside the discharge chamber member 10, there is provided a volume varying means 50 for varying the volume of the discharge chamber 10a according to the pressure pulsation of the discharge gas flowing into the discharge chamber 10a. The volume varying means 50 is composed of a partition member 10b inside which is slidable in the axial direction of the discharge chamber, and an elastic member 10c such as a coil spring arranged in a space 10d on the side opposite to the discharge chamber of the partition member 10b. The discharge chamber 1
The volume of 0a is variable. Partition member 1
0b divides the inside of the discharge chamber member 10 in the axial direction to discharge the discharge chamber 1
0a and the space 10d, and is arranged so as to face the discharge port 8a and is supported by an elastic member 10c so as to be movable in the inflow direction of the discharge gas discharged from the discharge port 8a. There is.

Discharge silencers 18 and 19 are arranged adjacent to each other on both sides of the cylinder 1. The discharge silencers 18 and 19 are fixed to the mounting member 51 on the side opposite to the discharge chamber member and communicate with the discharge chamber 10a through the passage of the discharge chamber member 10 and the communication hole of the discharge valve 9. The discharge silencer 19 communicates with the discharge pipe 20 on the side opposite to the mounting member, and the discharge pipe 20 communicates with the discharge pipe 12. The discharge pipe 12 penetrates the closed container 14 and projects to the outside. The discharge silencers 18 and 19 form an expansion chamber in the discharge gas discharge passage.

Then, a working fluid is supplied from the outside to the closed container 14
A suction pipe 17 for sucking in is provided so as to penetrate the closed container 14. A suction silencer 11 arranged below the discharge chamber member 10 is attached.
The working fluid sucked into the closed container 14 passes from the suction silencer 11 through the passage of the discharge chamber member 10, and the suction valve 7
Is sucked into the working chamber 13 via.

The central portion of the above-mentioned drive shaft 5 is the main bearing member 3.
Is supported by a main bearing 3a provided at the center of the main bearing 3, and an electric element 6 is provided below the main bearing member 3. The electric element 6 includes a stator 6a and a rotor 6b.
The stator 6a is fixed to the main bearing member 3 with bolts or the like. The rotor 6b is fixed to the lower portion of the drive shaft 5 by shrink fitting or the like. The electric element 6 is composed of a brushless motor and is driven by a three-phase inverter at a variable rotation speed in order to improve the efficiency of the electric motor. However, other motor types,
For example, a DC motor or an induction motor may be used. Further, balancers 6c and 6d are provided at the upper and lower ends of the rotor 6b of the electric element 6 and one end of the drive shaft 5, respectively, so as to cancel the unbalanced amount during rotation.

The compression element and the electric element 6, which are connected to each other by the drive shaft 5 and the main bearing member 3, are elastically supported by a spring member 15 provided in a lower portion of the hermetic container 14. The spring member 15 is arranged between the closed container 14 and the rotor 6b.

The hermetic electric compressor of the present embodiment is of a low pressure system in which the inside of the hermetic container 14 is in a suction pressure atmosphere, and the lubricating oil 16 is stored in the bottom of the hermetic container 14 and the drive shaft is contained therein. The lower end of 5 is submerged. Due to the centrifugal pump action formed inside the drive shaft 5, the lubricating oil 16 is guided from the lower end side of the immersed drive shaft 5 to the oil supply hole (not shown) formed inside the drive shaft 5, It is supplied to each sliding portion such as the bearing 3a, the slider 4, the piston 2 and the cylinder 1, and serves to improve the lubrication of each portion and the sealing property of the working chamber 13. In this way, the closed container 1
By making the inside of the low pressure system 4 a low-pressure working fluid is sucked into the closed container 14, the reliability of the compression element and the electric element is improved, and the motor efficiency of the electric element is improved. When the pressure inside the closed container 14 is changed to the low pressure system, the working fluid discharged from the working chamber 13 needs to be discharged to the outside of the closed container 14 through the closed discharge path.

Next, the flow of working fluid in the hermetic electric compressor of this embodiment will be described. When the compressor is operated, as shown by the arrow in FIG. 2, the working fluid that has passed through the suction pipe 17 and entered the closed container 14 is sucked into the suction silencer 1.
1 through the suction port formed in the pump member 8 into the working chamber 13 through the suction valve 7 and compressed by the operation of the piston 2. The compressed working fluid passes through the discharge port 8a formed in the pump member 8 and pushes up the discharge valve 9 to enter the discharge chamber 10a formed by the discharge chamber member 10 and the discharge silencers 18, 19 communicating with the discharge chamber 10a. It is discharged from the discharge pipe 12 through the pipe 20 to the outside of the compressor.

As described above, the piston 2 reciprocates by the rotation of the drive shaft 5, and the working fluid is sucked and compressed in the working chamber 13. During the discharge stroke, the discharge valve 9
The pressure pulsation of the discharge gas is generated with the opening and closing of the. However, with the above configuration, since the space of the discharge chamber 10a is variable, the discharge gas pulsation is alleviated, and a low-vibration, low-noise hermetic electric compressor is provided. can do. Further, since the above-described configuration is provided in the space of the discharge chamber 10a in the immediate vicinity of the discharge valve 9, the pulsation reducing effect thereof is remarkably large. Further, by tuning the spring steel of the elastic member 10c, it is possible to reduce vibration and noise under arbitrary operating conditions such as a constant speed machine.
Further, since the over-compression loss can be reduced by the amount of pulsation reduction, the compressor performance can be improved.

Discharge chamber 10a and discharge silencers 18, 19
, The discharge gas pulsation components that could not be completely removed in the discharge chamber 10a are discharged downstream of the discharge silencer 18, 1.
Since it is reduced by 9, the pulsation reducing effect is further increased. Actually, the damping frequency range of the discharge chamber 10a space changes depending on the capacity and structure of the compressor, but for the fixed discharge chamber volume, the experimental results show that the variable space of the present embodiment shows that the compressor efficiency is high. It was possible to improve by about 10%. Further, it is desirable that the discharge chamber 10a has a volume that is at least the stroke volume or more.

In the embodiment, a discharge chamber member 10 having a discharge chamber 10a formed on the discharge side of the discharge valve 9 is provided,
Since the volume changing means 50 for changing the volume of the discharge chamber 10a of the discharge chamber member 10 according to the pressure pulsation of the discharge gas discharged into the discharge chamber 10a is provided, the pressure pulsation of the discharge gas can be made smaller than in the conventional example. The performance to be reduced can be remarkably improved, and a hermetic electric compressor having low noise and low vibration and excellent compressor performance can be obtained. Also, the discharge chamber 10
Since the volume varying means 50 is configured by the partition member 10b that is movably arranged in a and the elastic member 10c that elastically supports the partition member 10b, it is easy to store in the narrow discharge chamber 10a. With the structure, the pressure pulsation of the discharge gas can be reduced. Further, the partition member 10b is arranged so as to face the discharge port 8a of the cylinder 1, and the partition member 1 is arranged in the inflow direction of the discharge gas flowing into the discharge chamber 10a.
Since 0b is movably supported by the elastic member 10c,
The pressure pulsation of the discharge gas discharged from the discharge port of the cylinder 1 can be directly and surely absorbed and reduced.

Next, a hermetic electric compressor according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a hermetic electric compressor according to a second embodiment of the present invention. This embodiment is different from the first embodiment as described below, and other points are basically the same as the first embodiment.

Inside the discharge chamber member 21, a partition member 21a which is slidable in the axial direction is arranged, and a fluid 21d such as oil is provided in a space 21c on the side opposite to the discharge chamber of the partition member 21a. The volume of the discharge chamber 21b is variable, and the volume of the discharge chamber 21b is variable. A seal member 21e is provided on the outer peripheral portion of the partition member 21a, and the discharge chamber 21b and the fluid side space 2 are provided.
1c is sealed.

In such a structure, during the discharge stroke, discharge pressure pulsation occurs with the opening and closing of the discharge valve 9, but since the space of the discharge chamber 21b is variable, the discharge gas pulsation is remarkably alleviated and low vibration, It is possible to obtain a hermetic electric compressor that has low noise and excellent compressor performance. Also,
Since the above-mentioned configuration is made in the space of the discharge chamber 21b in the immediate vicinity of the discharge valve 9, its pulsation reducing effect is remarkably large. Further, the attenuation rate can be easily changed by changing the type of the sealed fluid 21d. The above-described configuration is suitable for a large-capacity hermetic electric compressor with large discharge gas pulsation. Further, as the fluid 21d to be sealed, a similar effect can be obtained even if an intermediate pressure in the compressor is guided by a pipe or the like. Further, since the over-compression loss can be reduced by the amount of pulsation reduction, the compressor performance can be improved.

Next, a hermetic electric compressor according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view showing a hermetic electric compressor according to a third embodiment of the present invention. This embodiment is different from the first embodiment as described below, and other points are basically the same as the first embodiment.

A partition member 22a is arranged in the discharge chamber member 22, and a space 22c on the side opposite to the discharge chamber of the partition member 22a is provided.
Is provided with an actuator 22d that moves the main shaft of the partition member 22a in the axial direction by an electrical signal, and thereby a volume changing means 50 that can change the volume of the discharge chamber 22b is configured. A seal member 22e is provided on the partition member 22a to seal the discharge chamber 22b and the fluid side space 22c. This actuator 22
d is for driving the partition member 22a so as to change the volume of the discharge chamber 22 of the discharge chamber member 22 according to the change in the compressor rotation speed driven by the electric element 6. Specifically, the actuator 22d is driven based on the signal value from the driving device.

In this embodiment, the volume of the discharge chamber 22b of the discharge chamber member 22 is changed by the actuator 22d which moves the partition member 22a for partitioning the inside of the discharge chamber 22b of the discharge chamber member 22 based on an electric signal or a magnetic signal. Since the volume varying means 50 is provided, the peak value of the discharge pressure can be reduced over the region where the rotation speed of the compressor changes, and the noise and vibration can be reduced and the compressor performance can be improved. That is, since the volume of the discharge chamber 22b can be arbitrarily changed, it is possible to set the optimum discharge chamber 22b space in accordance with a wide operating frequency of the compressor (in other words, compressor rotation speed) and operating pressure conditions. As a result, a hermetic electric compressor with further low vibration and low noise can be obtained. In addition, the electric signal enables more detailed control. Further, the present embodiment can be applied to the damping frequency characteristic region of the hermetic electric compressor for all capacities and purposes without being affected by the shape of the discharge chamber member 22 determined from the hermetic container 14 or the like. The actuator 22d can also obtain the same effect with a magnetic signal or the like.
Particularly, since the peak value of the discharge pressure can be reduced and the over-compression loss can be reduced, the performance of the compressor can be remarkably improved.

Next, a hermetic electric compressor according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view showing a hermetic electric compressor according to a fourth embodiment of the present invention. This embodiment is different from the first embodiment as described below, and other points are basically the same as the first embodiment.

A partition member 10b, which is slidable in the axial direction inside the discharge chamber member 10, is arranged, and an elastic member 10c such as a spring is arranged in a space 10d on the side opposite to the discharge chamber of the partition member 10b. The discharge chamber 10a
The first volume changing means 50 is configured so that the volume of the space can be changed. On the other hand, in the discharge silencer 23 that communicates with the discharge chamber 10a, a partition member 23a that is slidable in the axial direction is arranged, and in a space 23b on the side opposite to the discharge chamber of the partition member 23a, an elastic member 23d such as a spring. Is provided, and thereby, the second volume varying means 50A capable of varying the volume of the space inside the discharge silencer 23 is configured.

In the above structure, during the discharge stroke, discharge pressure pulsation is generated as the discharge valve 9 is opened and closed.
The primary discharge gas pulsation is mitigated by the first volume varying means in the space of the discharge chamber 10a. Further, the second volume changing means in the space 23c of the discharge silencer 23 downstream of the discharge chamber 10a further alleviates the discharge gas pulsation. As a result, a hermetic electric compressor with low vibration and low noise can be obtained. Further, in the hermetic electric compressor of the present embodiment, the discharge silencer 19 is arranged, so that the effect is further enhanced. Further, although the structure of the discharge silencer 23 of the present embodiment is the structure of the elastic member 23d such as a spring, the same effect as that of the present embodiment can be obtained by the structure of a fluid or an actuator. Moreover, since the over-compression loss can be further reduced, the compressor performance can be further improved.

Next, a hermetic electric compressor according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view showing a hermetic electric compressor according to a fifth embodiment of the present invention. This embodiment is different from the second embodiment as described below, and is otherwise basically the same as the second embodiment.

A partition member 21a, which is slidable in the axial direction, is disposed inside the discharge chamber member 21, and a fluid 21d such as oil is sealed in a space 21c on the side opposite to the discharge chamber of the partition member 21a. The discharge chamber 21
First volume changing means 50 capable of changing the volume of the b space
Is configured. In addition, a seal member 21e is provided on the partition member 21a, and the discharge chamber 21b and the fluid side space 21 are provided.
It is sealed with c. On the other hand, a partition member 24a slidable in the axial direction is arranged in the discharge silencer 24 communicating with the discharge chamber 21b, and an elastic member 24d such as a spring is provided in a space 24c on the side opposite to the discharge chamber of the partition member 24a. Is provided, whereby the discharge silencer 24 inner space 2
Second volume changing means 50A capable of changing the volume of 4b
Is configured.

In the above structure, during the discharge stroke, the discharge pressure pulsation occurs as the discharge valve 9 opens and closes.
The first discharge gas pulsation is mitigated by the first volume varying means in the discharge chamber 21b space. Further, the discharge gas pulsation is further alleviated by the second volume varying means in the space 24b of the discharge silencer 24 downstream of the discharge chamber 21b. As a result, a hermetic electric compressor with low vibration and low noise can be obtained. Further, in the hermetic electric compressor of the present embodiment, the discharge silencer 19 is arranged, so that the effect is further enhanced. Further, although the structure of the discharge silencer 24 of the present embodiment is the structure of the elastic member 24d such as a spring, the same effect as that of the present embodiment can be obtained by the structure of a fluid or an actuator. Moreover, since the over-compression loss can be further reduced, the compressor performance can be further improved.

Next, a hermetic electric compressor according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a hermetic electric compressor according to a sixth embodiment of the present invention. This embodiment is different from the third embodiment as described below, and other points are basically the same as the third embodiment.

A partition member 22a is arranged in the discharge chamber member 22, and a space 22c on the side opposite to the discharge chamber of the partition member 22a.
Is provided with an actuator 22d that moves the main shaft of the partition member 22a in the axial direction in response to an electrical signal, whereby the volume of the discharge chamber 21b space is variable.
The volume varying means 50 is configured. In addition, the partition member 22a is provided with a seal member 22e, and the discharge chamber 22
The b and the fluid-side space 22c are sealed. On the other hand, in the discharge silencer 25 communicating with the discharge chamber 22b, a partition member 25a that is slidable in the axial direction is arranged, and in a space 25c on the side opposite to the discharge chamber of the partition member 25a, an elastic member 25d such as a spring. Is provided, and thereby, the second volume varying means 50A capable of varying the volume of the space inside the discharge silencer 25 is configured.

With the above structure, first, the first volume varying means in the space of the discharge chamber 22b reduces the peak value of the discharge pressure over the region where the rotation speed of the compressor changes, as in the third embodiment. The low noise and low vibration can improve the compressor performance. Furthermore, the discharge chamber 22
The discharge gas pulsation is alleviated by the second volume varying means 50A in the discharge silencer 25 space 25c downstream of b. As a result, it is possible to obtain a hermetic electric compressor with further reduced vibration and noise. In addition, since the volume of the discharge chamber 22b can be arbitrarily changed, the discharge chamber 22b that is optimal according to the operating frequency and operating pressure conditions of a wide range of the compressor.
It is possible to set the space, and as a result, it is possible to obtain a hermetic electric compressor with further low vibration and low noise. In addition, the electric signal enables more detailed control.
Further, the present embodiment can be applied to the damping frequency characteristic region of the hermetic electric compressor for all capacities and purposes without being affected by the shape of the discharge chamber member 22 determined from the hermetic container 14 or the like. Further, the actuator 22d is
The same effect can be obtained with a magnetic signal or the like. Moreover, since the over-compression loss can be further reduced, the compressor performance can be further improved.

Next, a refrigerating apparatus according to the seventh embodiment of the present invention will be described with reference to FIG. FIG. 8 is a refrigeration cycle configuration diagram of the refrigeration apparatus of the seventh embodiment of the present invention.

The present embodiment is a refrigeration system equipped with the hermetic electric compressor 26 of the first embodiment described above. This refrigeration system includes a refrigeration cycle in which a hermetic electric compressor 26, a condenser 27, an expansion valve 29 as a pressure reducing device, and an evaporator 30 are connected by a refrigerant pipe, and a condenser fan that ventilates the condenser 27. 28, an evaporator fan 31 that ventilates the evaporator 30, and an inverter 32 that is a drive device that drives the hermetic electric compressor 26 in a variable rotation speed.

When the hermetic electric compressor 26 is started by the inverter 32, the working fluid is compressed between the cylinder 1 and the piston 2, and the compressed high-temperature and high-pressure working gas is discharged from the discharge pipe as indicated by a solid arrow. 12 to condenser 2
7, the heat is radiated and liquefied by the blowing action of the condenser fan 28, is squeezed by the expansion valve 29, is adiabatically expanded to a low temperature and low pressure, and is endothermic gasified by the evaporator 30, and then the suction pipe 1
7 is sucked into the hermetic electric compressor 26.

By using the hermetic electric compressor 26 having the structure of the first embodiment described above in the refrigeration cycle,
The pressure pulsation of the refrigerant circulating in the refrigeration cycle is reduced, and a low noise and low vibration refrigeration system can be obtained. The second
A refrigeration apparatus using the hermetic electric compressors of the embodiments to the sixth embodiments may be used, and in that case, the unique effects of each embodiment can be obtained.

Next, an air conditioner according to the eighth embodiment of the present invention will be described with reference to FIG. FIG. 9: is a refrigerating cycle block diagram of the air conditioner of 8th Embodiment of this invention.

The present embodiment is an air conditioner equipped with the hermetic electric compressor 33 of the first embodiment described above. In this air conditioner, a hermetic electric compressor 33, a four-way valve 39 that switches between heating and cooling, an outdoor heat exchanger 34 that is a condenser, an expansion valve 36 that is a pressure reducing device, and an indoor heat exchanger 37 that is an evaporator are connected by refrigerant piping. The connected refrigeration cycle, the outdoor fan 35 that ventilates the outdoor heat exchanger 34, the indoor fan 38 that ventilates the indoor heat exchanger 37, and the inverter 40 that is a drive device that drives the hermetic electric compressor 26. It has and.
Then, these devices are separated into an outdoor unit 41 and an indoor unit 42 as shown by a chain line, and the both are connected by a refrigerant pipe and electric wiring.

The hermetic electric compressor 33 includes a working fluid (for example, Freon (HCFC2) between the cylinder 43 and the piston 44.
2, R410A, R407C, etc.))). In the cooling operation, the compressed high-temperature, high-pressure working fluid flows from the discharge pipe 45 to the four-way valve 39 as indicated by the solid arrow.
Through the outdoor heat exchanger 34, is radiated and liquefied by the blowing action of the outdoor fan 35, and is squeezed by the expansion valve 36.
It adiabatically expands to a low temperature and low pressure, and is sucked into the hermetic electric compressor 33 through the suction pipe 46.

By using the hermetic electric compressor 26 having the structure of the first embodiment described above in the refrigeration cycle,
The pressure pulsation of the refrigerant circulating in the refrigeration cycle is reduced, and an air conditioner with low noise and low vibration can be obtained. The second
An air conditioner using the hermetic electric compressors of the embodiments to the sixth embodiments may be used, and in this case, the effects peculiar to each embodiment can be obtained.

In each of the above-mentioned embodiments, the reciprocating hermetic electric compressor has been described as an example, but the present invention is also applicable to a rotary hermetic electric compressor and the like.

[0053]

According to the present invention, the pressure pulsation of the discharge gas discharged from the working chamber is directly reduced, the noise is low, the vibration is low, and the compressor performance is excellent. The device can be obtained.

Further, according to the present invention, the peak value of the discharge pressure is reduced in the region where the compressor rotation speed changes, and the noise is low, the vibration is low, and the compressor performance is excellent. And a refrigeration / air-conditioning system can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a hermetic electric compressor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the hermetic electric compressor.

FIG. 3 is a cross-sectional view showing a hermetic electric compressor according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a hermetic electric compressor according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a hermetic electric compressor according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a hermetic electric compressor according to a fifth embodiment of the present invention.

FIG. 7 is a transverse sectional view showing a hermetic electric compressor according to a sixth embodiment of the present invention.

FIG. 8 is a refrigeration cycle configuration diagram of a refrigeration apparatus of a seventh embodiment of the present invention.

FIG. 9 is a refrigeration cycle configuration diagram of an air conditioner according to an eighth embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view of a cylinder discharge part in the hermetic electric compressor according to the first embodiment of the present invention.

[Explanation of symbols]

1 ... Cylinder, 2 ... Piston, 2a ... Slide tube, 3 ...
Main bearing member, 4 ... Slider, 5 ... Drive shaft, 6 ... Electric element, 6a ... Stator, 6b ... Rotor, 7 ... Suction valve, 8 ... Pump member, 8a ... Discharge port, 9 ... Discharge valve, 10 ... Discharge chamber member, 10a ... Discharge chamber, 10b ... Partition member, 10c ... Elastic member, 10d ... Space, 11 ... Suction silencer, 12 ... Discharge pipe, 13 ... Working chamber, 14 ... Closed container, 15 ... Spring member, 17 ... Intake pipe, 18, 19 ... Discharge silencer, 20 ... Discharge pipe, 21 ... Discharge chamber member, 22 ... Discharge chamber member, 23 ... Discharge silencer, 24 ... Discharge silencer, 2
5 ... Discharge silencer, 50, 50A ... Volume changing means, 5
1 ... Mounting member.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigetaro Tagawa             800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi             Hitachi Tochigi Technology Co., Ltd. (72) Hideki Yazawa             800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi             Hitachi Tochigi Technology Co., Ltd. F-term (reference) 3H003 AA02 AB03 AC03 BA03 BB08                       CD03

Claims (9)

[Claims] 1. A closed container, a compression element provided in the closed container, a cylinder that forms a cylinder chamber of the compression element, and a piston that moves in the cylinder chamber to form a working chamber together with the cylinder. A discharge valve that opens and closes a discharge port of the working chamber, and a discharge chamber member having a discharge chamber formed on the discharge side of the discharge valve, and the discharge according to the pressure pulsation of the discharge gas discharged into the discharge chamber. A hermetically-type electric compressor characterized in that a volume varying means for varying the volume of the discharge chamber of the chamber member is provided. 2. The volume varying means according to claim 1,
A hermetic electric compressor comprising: a partition member movably arranged in the discharge chamber, and an elastic member elastically supporting the partition member. 3. A closed container, a compression element provided in the closed container, a cylinder that forms a cylinder chamber of the compression element, and a piston that moves in the cylinder chamber to form a working chamber together with the cylinder. A discharge valve that opens and closes the discharge port of the working chamber, a discharge chamber member having a discharge chamber formed on the discharge side of the discharge valve, and a discharge silencer that communicates with the discharge chamber, and discharges into the discharge chamber. A second volume varying unit that varies the volume of the discharge chamber of the discharge chamber member according to the pressure pulsation of the discharge gas is provided, and a second volume that changes the volume of the discharge silencer chamber according to the pressure pulsation in the discharge silencer. A hermetic electric compressor characterized in that a volume varying means is provided. 4. A closed container, a compression element provided in the closed container, an electric element for driving the compression element, a cylinder forming a cylinder chamber of the compression element, and a motion in the cylinder chamber to move the cylinder. A piston that forms a working chamber together with a cylinder, a discharge valve that opens and closes a discharge port of the working chamber, a discharge chamber member that has a discharge chamber formed on the discharge side of the discharge valve, and the rotation speed of the electric element is variable. A hermetically-operated electric compressor, comprising: a drive device for driving; and a volume varying means for varying a discharge chamber volume of the discharge chamber member according to a change in a compressor rotation speed driven by the drive device. . 5. The volume varying means according to claim 4,
A hermetic electric compressor comprising a movable partition member arranged in the discharge chamber, and an actuator for driving the partition member. 6. The hermetic electric compressor according to claim 4, wherein the volume varying means is configured to vary the discharge chamber volume of the discharge chamber member based on a signal value from the drive device. . 7. An airtight container, a compression element provided in the airtight container, an electric element for driving the compression element, a cylinder forming a cylinder chamber of the compression element, and a motion in the cylinder chamber to move the cylinder. A piston that forms a working chamber together with a cylinder, a discharge valve that opens and closes a discharge port of the working chamber, a discharge chamber member having a discharge chamber formed on the discharge side of the discharge valve, and a discharge silencer that communicates with the discharge chamber. A first volume varying means for varying the discharge chamber volume of the discharge chamber member according to a change in the compressor rotation speed driven by the drive device. And a second volume changing means for changing the volume of the discharge silencer chamber according to the pressure pulsation in the discharge silencer. 8. A hermetic electric compressor, a condenser, a decompression device, and an evaporator are connected by a pipe to form a refrigeration cycle, and the hermetic electric compressor is provided in a hermetic container and in the hermetic container. A compression element, a cylinder that forms a cylinder chamber of the compression element, a piston that moves in the cylinder chamber to form a working chamber together with the cylinder, a discharge valve that opens and closes a discharge port of the working chamber, and the discharge A discharge chamber member having a discharge chamber formed on the discharge side of the valve; and a volume varying means for varying the discharge chamber volume of the discharge chamber member according to the pressure pulsation of the discharge gas flowing into the discharge chamber. Refrigerating / air-conditioning system. 9. A hermetic electric compressor, a condenser, a decompression device, and an evaporator are connected by piping to form a refrigeration cycle, and the hermetic electric compressor is provided in a hermetic container and in the hermetic container. A compression element, an electric element that drives the compression element, and a cylinder that forms a cylinder chamber of the compression element,
A piston that moves in the cylinder chamber to form a working chamber together with the cylinder, a discharge valve that opens and closes a discharge port of the working chamber, and a discharge chamber member having a discharge chamber formed on the discharge side of the discharge valve, A driving device that variably drives the rotation speed of the electric element, and a volume changing means that changes the discharge chamber volume of the discharge chamber member according to a change in the compressor rotation speed driven by the driving device. A characteristic refrigeration and air conditioning system.