WO2013168194A1

WO2013168194A1 - Airtight compressor and heat pump device

Info

Publication number: WO2013168194A1
Application number: PCT/JP2012/003022
Authority: WO
Inventors: 哲英横山; 雷人河村; 関屋　慎; 白藤　好範; 英明前山; 谷　真男; 高橋　真一; 宏樹長澤; 勝巳遠藤
Original assignee: 三菱電機株式会社
Priority date: 2012-05-09
Filing date: 2012-05-09
Publication date: 2013-11-14
Also published as: CN104379937A; CN104379937B; JP5866004B2; JPWO2013168194A1

Abstract

According to the present invention, a compression mechanism (99) of an airtight twin compressor (100) is configured from a sequential stack of a first discharge muffler (30), a first support member (60), a first cylinder (11), an intermediate dividing plate (5), a second cylinder (21), a second support member (70), and a second discharge muffler (40); the first cylinder (11) and the second cylinder (21) being provided with a first discharge port (16) and a second discharge port (26) for discharging compressed refrigerant to a first discharge muffler space (32) and a second discharge muffler space (42). Also provided are a first expelling flow channel (34) for communicating the first discharge muffler space (32) and the interior of an airtight container (8), a second expelling flow channel (44) for communicating the second discharge muffler space (42) and the interior of the airtight container (8), and communication flow channels (51, 52, 53) for communicating the first discharge muffler space (32) and the second discharge muffler space (42).

Description

Hermetic compressor and heat pump device

The present invention relates to a hermetic compressor and a heat pump device, and more particularly to a hermetic compressor that compresses refrigerant and a heat pump device using the hermetic compressor.

A refrigerant compressor that drives a vapor compression refrigeration cycle is used in heat pump devices such as a refrigerator-freezer, an air conditioner, and a heat pump water heater. From the viewpoint of preventing global warming, it is necessary to save energy and improve efficiency of the vapor compression refrigeration cycle.
In addition, regulations that suppress GWP (global warming potential) of refrigerants have been strengthened, and use of natural refrigerants such as HC (isobutane, propane), low GWP refrigerants such as HFO1234yf, and the like has been studied.
However, since these refrigerants operate at a low pressure and low density as compared with conventional chlorofluorocarbon refrigerants, the ratio of power loss due to pressure loss generated inside the refrigerant compressor to the compressor input increases. For this reason, it is necessary to reduce the pressure loss in order to increase the efficiency of the compressor using these low-pressure alternative refrigerants.

In the conventional refrigerant compressor, when the discharge valve that controls the opening and closing of the discharge port is opened, the refrigerant compressed by the compression unit is discharged from the cylinder chamber of the compression unit through the discharge port to the discharge muffler chamber. The discharged refrigerant is reduced in pressure pulsation and silenced in the discharge muffler chamber, and then flows into the internal space of the sealed container from the communication port through the discharge flow path.
Here, a pressure loss occurs between the discharge from the cylinder chamber and the flow into the internal space of the sealed container, and a pressure pulsation occurs due to a phase shift between the pressure change in the cylinder chamber and the valve opening / closing. . Such pressure pulsation causes a decrease in compressor efficiency and a decrease in the refrigeration cycle COP due to an overcompression (overshoot) loss in the cylinder chamber.
Further, the pressure pulsation of the primary component of the operating frequency generates a vibration in the thrust direction in the compression mechanism such as the motor rotor portion and the drive shaft in the hermetic container, which causes a decrease in reliability. Further, the pressure pulsation of the high-frequency component occurs due to high-speed discharge jet, valve nonlinear behavior, resonance in the discharge muffler chamber, and the like, and causes noise.

According to Patent Document 1, conventionally, an electric motor in a hermetically sealed container, a drive shaft that is rotated by the electric motor, a main bearing and a sub bearing that support the drive shaft, and a piston that is operated by the drive shaft in a single cylinder cylinder are used as a refrigerant. In a hermetic refrigerant compressor comprising a compression element that sucks and compresses the first discharge muffler chamber (front muffler) on the main bearing side so as to cover the first discharge mechanism for discharging the refrigerant compressed in the cylinder chamber Single cylinder cylinder in which a second discharge muffler chamber (rear muffler chamber) is formed on the auxiliary bearing side so as to cover the second discharge mechanism for discharging the refrigerant compressed in the cylinder chamber. In the single-cylinder compressor that discharges from these two discharge holes, the internal pressure on the rear muffler side rises and the temperature of the rear muffler chamber becomes higher than that of the front muffler chamber, and is close to the rear muffler chamber. Sliding parts (e.g., a rolling piston and vanes) that include abnormal wear or seizure is a problem that occurs very hot.
Therefore, in the invention described in Patent Document 1, the first discharge flow path for guiding the compressed refrigerant discharged into the front muffler chamber into the sealed container and the compressed refrigerant discharged into the rear muffler chamber are guided into the sealed container. A second discharge channel is provided, and a through hole (communication channel) for communicating the front muffler chamber and the rear muffler chamber is formed.
The flow area flowing out from the second discharge mechanism through the rear muffler chamber into the sealed container is increased, the flow rate flowing out from the second discharge mechanism is increased instead of the first discharge mechanism, and the pressure and temperature of the rear muffler chamber are increased. It has been shown that the rise in the pressure becomes small, and problems such as abnormal wear and seizure of the sliding portion adjacent to the rear muffler can be prevented.

As typical silencer mufflers, (1) Helmholtz resonance silencers and (2) expansion silencers are generally used (see, for example, Non-Patent Document 1).
(1) According to Non-Patent Document 1 (p. 267), a Helmholtz resonator composed of a buffer container having an opening is
Resonance frequency: f = (c / 2π) × (S / (L × V)) ^0.5
L: Opening effective length (= d + k × D)
c: speed of sound,
S: opening area (= πD ^2/4),
V: Buffer container volume D: Opening representative diameter,
d: actual size of the opening,
Correction coefficient: k
It has a function to absorb sound by resonating.
(2) Non-Patent Document 1 (p. 180-181) describes that a silencing function is performed at a frequency lower than the limit frequency fc (usually several kHz level) of a typical one-stage expansion silencer.
In the case of a coaxial cylindrical shape (radius a, coaxial length L, inlet and outlet pipes on the upper and lower surfaces), the resonance frequency f1 in the coaxial direction (= 0.5 × sonic velocity / L) is the resonance frequency f2 in the radial direction (= 0). .6 × sound speed / a) (f1> f2), it is shown that the expansion silencer does not function sufficiently.

Since the discharge muffler of the conventional rotary compressor has a short cylindrical shape in the axial direction, there is a side surface that does not function as an expansion silencer.

Japanese Unexamined Patent Publication No. 5-195976 (page 3-4, FIG. 2)

In the invention disclosed in Patent Document 1, since the structure is such that one cylinder compresses and discharges from two locations, the pressure pulsations generated in the front muffler chamber and the rear muffler chamber are synchronized in the same phase, and the through hole or the front muffler There was a problem that the primary component of pressure pulsation synthesized in the chamber became larger.
Further, there is a problem in that the flow in the front muffler chamber is disturbed and pressure loss is increased by joining the rear muffler chamber through the through hole to the front muffler chamber.
In addition, since the refrigerant discharged from the second discharge mechanism is expanded in two stages in the rear muffler chamber and the front muffler chamber, it is also a problem that the sound deadening effect is great but the pressure loss is also increased.
The invention described in Patent Document 1 is only a case of a single cylinder compressor (synonymous with a single compressor) that compresses by one cylinder, and a two-cylinder compressor (twin compression) that compresses by two cylinders. In this case, the optimal discharge path configuration is not disclosed.
Further, the front muffler chamber has a substantially coaxial cylindrical shape (radius a, coaxial length L, with inlet / outlet pipes on the upper and lower surfaces), and has a side surface that is insufficiently functioning as an expansion silencer because the coaxial length L is short. There was a problem to improve this.

The present invention solves the above-mentioned problem, and in a sealed two-cylinder compressor, a hermetic compressor capable of achieving both reduction in pressure pulsation and reduction in pressure loss in a discharge section, and said sealed type A heat pump apparatus using a compressor is provided.

A hermetic compressor according to the present invention includes a hermetic container,
An electric motor installed in the sealed container;
A drive shaft that is rotationally driven by the electric motor and rotatably supported by the first support member and the second support member; an intermediate partition plate disposed between the first support member and the second support member;
A first cylinder coupled to the drive shaft is movably accommodated, and a first cylinder that forms a first compression chamber between the first support member and the intermediate partition plate; and A first discharge port formed in the first support member that discharges the compressed refrigerant, and is installed in the first support member so as to cover the first discharge port, and is discharged from the first discharge port. A first muffler container that forms a first muffler space into which refrigerant flows;
A second piston that is movably accommodated in the second drive shaft and that forms a second compression chamber between the second support member and the intermediate partition plate; and A second discharge port formed in the second support member that discharges the compressed refrigerant, and is installed in the second support member so as to cover the second discharge port, and is discharged from the second discharge port. A second muffler container that forms a second muffler space into which the refrigerant flows;
A first discharge channel that directly guides the compressed refrigerant from the first muffler space to the inner space of the sealed container, and a second discharge channel that directly guides the compressed refrigerant from the second muffler space to the inner space of the sealed container A communication channel through which a refrigerant flows through the first muffler space and the second muffler space;
With
The first piston and the second piston are driven in opposite phases, and have a silencing function for reducing pressure pulsation by allowing a refrigerant to flow through the communication flow path and propagating a pressure amplitude.

The hermetic compressor according to the present invention can reduce the pressure pulsation and pressure loss of the compressor discharge section, and can improve efficiency, reduce vibration noise, and improve reliability.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view explaining the structure of the hermetic twin compressor which concerns on Embodiment 1 of this invention. Sectional drawing of the A-A 'cross section of the hermetic twin compressor shown in FIG. Sectional drawing of the B-B 'cross section of the hermetic twin compressor shown in FIG. The longitudinal cross-sectional view explaining the structure of the hermetic twin compressor which concerns on Embodiment 2 of this invention. Sectional drawing of the A-A 'cross section of the hermetic twin compressor shown in FIG. Sectional drawing of the B-B 'cross section of the hermetic twin compressor shown in FIG. The longitudinal cross-sectional view explaining the structure of the hermetic twin compressor which concerns on Embodiment 3 of this invention. Sectional drawing of the A-A 'cross section of the hermetic twin compressor shown in FIG. Sectional drawing of the B-B 'cross section of the hermetic twin compressor shown in FIG. The longitudinal cross-sectional view explaining the structure of the hermetic twin compressor which concerns on Embodiment 4 of this invention. FIG. 11 is a cross-sectional view taken along the line A-A ′ of the hermetic twin compressor shown in FIG. 10. Sectional drawing of the B-B 'cross section of the hermetic twin compressor shown in FIG. The block diagram of the heat pump apparatus which concerns on Embodiment 5 of this invention.

Hereinafter, the first and second embodiments will be described with reference to the drawings. In Embodiment 1, a closed twin compressor (same as a closed two-cylinder compressor) having a first compression section and a second compression section will be described. In Embodiment 2, the closed twin compressor is used. A vapor compression refrigeration cycle will be described. In the figure, the flow of the refrigerant is indicated by thick arrows. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and a part of the description is omitted. Each figure is drawn typically, and the present invention is not limited to the illustrated form.

[Embodiment 1]
FIG. 1 explains the configuration of a hermetic twin compressor according to Embodiment 1 of the present invention. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a transverse sectional view (AA ′ section shown in FIG. 1). 3 is a transverse cross-sectional view (BB ′ cross section shown in FIG. 1).
In FIG. 1, a hermetic twin compressor (same as a hermetic two-cylinder compressor) 100 is installed in a hermetic container 8 and an inner space of the hermetic container 8 (hereinafter referred to as “hermetic container inner space”) 3. A first compression unit 10, a second compression unit 20, a compression mechanism 99 including a drive shaft 6 that drives them, and an electric motor 9 that rotates the drive shaft 6 are provided.

(Compression mechanism)
The compression mechanism 99 includes a first compression unit 10 and a second compression unit 20, each of which is sequentially stacked along the drive shaft 6 from the lower side to the upper side in the axial direction. One discharge muffler 30, a first support member (corresponding to a secondary bearing) 60, a first cylinder 11 that constitutes the first compression unit 10, an intermediate partition plate 5, and a second that constitutes the second compression unit 20 The cylinder 21, a second support member (corresponding to a main bearing) 70, and a second discharge muffler 40 are configured.
An electric motor 9 is installed above the compression mechanism 99 with the electric motor lower space 3b interposed therebetween, and the drive shaft 6 is connected to the electric motor 9 (more precisely, a motor shaft).
Further, in the sealed container internal space 3, a lubricating oil storage portion 3 a for lubricating oil for lubricating the compression mechanism 99 is provided on the lowest side in the axial direction of the drive shaft 6.

(Compression part)
The 1st compression part 10 is provided with the 1st cylinder 11 which consists of a parallel plate. The first cylinder 11 has a cylindrical shape and is sandwiched between the first support member 60 and the intermediate partition plate 5, and a first cylinder chamber 11a, which is a compression space, is formed on the inner periphery.
In the first cylinder 11, a first rotary piston 12 that rotates eccentrically by the rotation of the drive shaft 6 is movably disposed. Further, a first cylinder suction port 15 communicating with the suction muffler 7 and a first discharge port 16 for discharging the compressed refrigerant to the first discharge muffler 30 are provided (see FIG. 2).
Similarly, the 2nd compression part 20 is provided with the 2nd cylinder 11 which consists of a parallel plate. The second cylinder 21 has a cylindrical shape and is sandwiched between the second support member 70 and the intermediate partition plate 5, and a second cylinder chamber 21 a that is a compression space is formed in the inner peripheral portion.
In the second cylinder 21, a second rotary piston 22 that rotates eccentrically with the rotation of the drive shaft 6 is movably disposed. Also, a second cylinder suction port 25 communicating with the suction muffler 7 and a second discharge port 16 for discharging the compressed refrigerant to the second discharge muffler 40 are provided (see FIG. 3).

That is, the first discharge muffler container 31 is installed on a first support member (corresponding to a secondary bearing) 60 that also serves as the first bearing portion 61 so as to cover the first discharge port 16, and the first support member 60 and the first support member 60. A first discharge muffler space 32 is formed by the discharge muffler container 31 (hereinafter, the first discharge muffler container 31 and the first discharge muffler space 32 are collectively referred to as “first discharge muffler 30”).
Similarly, a second discharge muffler container 41 is installed on a second support member (corresponding to a main bearing) 70 that also serves as the second bearing portion 71 so as to cover the second discharge port 26, and the second support member 70 and the second support member 70. The second discharge muffler container 41 forms a second muffler space 42 (hereinafter, the second discharge muffler container 41 and the second muffler space 42 are collectively referred to as “second discharge muffler 40”).
An electric motor lower space 3 b is formed between the electric motor 9 and the second discharge muffler container 41.

Further, a first discharge valve concave installation portion 18 that is a keyhole-shaped groove is formed around the first discharge port 16 on the first discharge port side surface 62 of the first support member 60 (corresponding to the auxiliary bearing). In addition, a first discharge mechanism 17 (here, a first reed valve 17a and a first stopper 17b for setting a lift amount) that opens and closes the first discharge port 16 is attached to the first discharge valve concave installation portion 18.
Similarly, the second discharge valve concave side which is a keyhole-shaped groove formed around the second discharge port 26 is provided on the second discharge port side surface 72 of the second support member 70 (corresponding to the main bearing). The second discharge mechanism 27 (here, the second reed valve 27a and the second stopper 27b for setting the lift amount) for opening and closing the second discharge port 26 is attached to the second discharge valve concave installation portion 28. It has been.

(Discharge muffler space)
In order to directly discharge the refrigerant from the first discharge muffler space 32 to the motor lower space 3b, the discharge flow path 34 is provided with a compression mechanism 99 (first support member 60, first cylinder 11, intermediate partition plate 5, second cylinder 21 and A second support member 70) is provided.
At this time, both ends of the discharge channel 34 are formed on the discharge port 34 a formed on the first discharge port side surface 62 of the first support member 60 and on the second discharge port side surface 72 of the second support member 70. It becomes the discharge port 34b. In addition, a first discharge port inflow guide 36 is provided to flow the annular flow in the first discharge muffler space 32 from the discharge port 34a to the discharge flow path 34 while smoothly changing the direction of the flow upward in the drive shaft.

In addition, a discharge flow path 44 is provided in the second discharge muffler container 41 in order to directly discharge the refrigerant from the second discharge muffler space 42 to the motor lower space 3b.
In addition, a plurality of

communication channels

51, 52, and 53 are provided for communicating the first discharge muffler space 32 and the second discharge muffler space 42. At this time, both ends of the

communication channels

51, 52, 53 are connected to the

communication ports

51 a, 52 a, 53 a formed on the first discharge port side surface 62 of the first support member 60, respectively, and the second of the second support member 70. The

communication ports

51b, 52b, and 53b are formed in the discharge port side surface 72.

(Resonance small space)
The communication port 52 a on the first discharge muffler space 32 side is arranged in a phase close to the first discharge port 16 of the first compression unit 10 and is surrounded by the first discharge port inflow guide 36 and the first discharge port rear surface guide 37. The first resonance small space 39 is arranged.
In addition, the communication port 51a on the first discharge muffler space 32 side is disposed in a phase close to the first discharge port 16 of the first compression unit 10 and is disposed outside the first resonance small space 39 (see FIG. 2). ).
On the other hand, the communication port 51 b on the second discharge muffler space 42 side is arranged in a phase close to the second discharge port 26 of the second compression unit 20 and is surrounded by the second discharge port inflow guide 46 and the second discharge port rear surface guide 47. The second resonance small space 49 is disposed.

Further, the communication port 52b on the second discharge muffler space 42 side is disposed in a phase close to the second discharge port 26 of the second compression unit 20, and is disposed outside the second resonance small space 49 (see FIG. 3). ).
Further, the communication port 53a and the communication port 53b of the communication channel 53 are respectively disposed outside the first resonance small space 39 and the second resonance small space 49, and the first discharge muffler space 32 and the second discharge muffler space 42 are provided. Are communicated directly (without passing through the first resonance small space 39 or the second resonance small space 49), and the refrigerant is designed to easily flow and pressure fluctuation is easily transmitted. This is because the refrigerant compressed and discharged in the opposite phase by the first piston and the second piston driven in the opposite phases in the cylinder is easily mixed via the communication flow path, and the pressure pulsations in the opposite phases occur. This is to make it easier to obtain the effect of canceling each other.

The first discharge port inflow guide 36 and the first discharge port rear surface guide 37 are formed of a plate material or a net material having a predetermined opening with a number of gaps and holes, and from the inside of the first resonance small space 39. The refrigerant is designed so that it can pass from the outside to the inside (from the outside, a predetermined resistance is applied). Similarly, the second discharge port inflow guide 46 and the second discharge port rear surface guide 47 are formed of a plate material or a net material having a predetermined opening with a large number of gaps and holes, and are formed in the second resonance small space 49. The refrigerant is designed to pass freely from the outside to the inside or from the outside to the inside (received a predetermined resistance when passing).
At this time, for each of the first resonance small space 39 and the second resonance small space 49, the volume V and the dimensions of the communication channels 52 and 51 (length L, channel cross section S) are matched to the Helmholtz resonance frequency. It is possible to design. If designed in accordance with the problematic operating frequency generated in the second discharge muffler space 42 and the first discharge muffler space 32, the problematic medium speed frequency band component (usually the secondary component of the operational frequency, 100 Hz or more) It can be removed.
The volume of the first resonance small space 39 or the volume of the second resonance small space 49 has a length d and a diameter D of the communication flow path 52 so as to resonate with the primary component f of the operating frequency.
Resonance frequency: f = (c / 2π) × (S / (L × V)) ^0.5
L: Opening effective length (= d + k × D)
c: refrigerant gas sound speed,
S: opening area (= πD ^2/4),
V: Buffer container volume Correction factor: k (approximately 1.57 × 0.5, ie, in the range of 7.5 to 0.8)
Can be determined to satisfy.

Further, since a normal discharge muffler has a flat cylindrical shape, its axial length is short and its function as an expansion silencer is insufficient. In the first embodiment, the discharge muffler is discharged from the

discharge ports

16 and 26. Considering it as a circulation channel with a rectangular cross-section leading to the outlet, we decided to increase the limit frequency by making it longer in the circulation direction.
In the first discharge muffler space 32 on the first compression unit 10 side, the refrigerant discharged from the first discharge port 16 flows in the counterclockwise direction (direction A) in FIG. A first discharge port rear surface guide 37 is arranged on the back side (clockwise direction) of the first discharge port 16 so as to flow into the discharge channel 34, and the distance from the first discharge port 16 to the first discharge port 34a is as much as possible. It is long. Since the first discharge port inflow guide 36 and the first discharge port rear surface guide 37 are designed such that the refrigerant can pass therethrough, a part of the refrigerant circulates in the counterclockwise direction (direction A).

Further, in the second discharge muffler space 42 on the second compression section 20 side, the refrigerant flows in the clockwise direction (B direction) in FIG. 3 from the second discharge port 26 and flows into the second discharge flow path 44. A second discharge port rear surface guide 47 is arranged on the rear surface side (counterclockwise direction) of the second discharge port 36, and the distance from the second discharge port 26 to the second discharge channel 44 is made as long as possible. For this reason, it is designed so that it can respond to a low frequency region (primary component and secondary component of the operating frequency) as an expansion silencer. In addition, since the 2nd discharge port inflow guide 46 and the 2nd discharge port back surface guide 47 are designed so that a refrigerant | coolant can pass through, a part of said refrigerant | coolant circulates in the clockwise direction (B direction).

(Refrigerant flow)
Next, the refrigerant flow in the hermetic twin compressor 100 will be described.
First, the low-pressure refrigerant flows into the suction muffler 7 (arrow II in FIG. 1) via the compressor suction pipe 1 (arrow I in FIG. 1). The refrigerant flowing into the suction muffler 7 is separated into a gas refrigerant and a liquid refrigerant in the suction muffler 7. The gas refrigerant passes through the suction muffler connecting pipe 4 and is distributed and sucked into the first cylinder 11 of the first compression section 10 and the second cylinder 21 of the second compression section 20 (arrow III, arrow in FIG. 1). IV).
Then, the refrigerant sucked into the first cylinder 11 is compressed, becomes a high-pressure refrigerant, and is discharged from the first discharge port 16 to the first discharge muffler space 32 (arrow V in FIG. 1), and the first discharge port 34a. From the second discharge port 34b to the motor lower space 3b (arrow VII in FIG. 1). Furthermore, it rises through the gap of the electric motor 9 and is discharged from the electric motor upper space 3c through the compressor discharge pipe 2 to the external refrigerant circuit (arrow VII in FIG. 1).

In addition, the refrigerant sucked into the second cylinder 21 and compressed is compressed to become a high-pressure refrigerant, and is discharged from the second discharge port 26 to the second discharge muffler space 42 (arrow VI in FIG. 1) to be discharged second. It is discharged to the electric motor lower space 3b through the flow path 44 (arrow VIII in FIG. 1). Furthermore, it rises through the gap of the electric motor 9 and is discharged from the electric motor upper space 3c through the compressor discharge pipe 2 to the external refrigerant circuit (arrow IX in FIG. 1).
In addition, when the 1st compression part 10 discharges a refrigerant | coolant, the 2nd compression part 20 suck | inhales a refrigerant | coolant, and conversely, when the 1st compression part 10 suck | inhales a refrigerant | coolant, the 2nd compression part 20 discharges a refrigerant | coolant. (Hereinafter referred to as “operating in opposite phase”).

(Reduction function of pressure pulsation in the discharge muffler space)
As described above, in the hermetic twin compressor 100 according to the first embodiment, since the first compression unit 10 and the second compression unit 20 operate in opposite phases, the pressure pulsation generated in the first discharge muffler 30 And the primary component of pressure pulsation generated in the second discharge muffler 40 are in opposite phases. Therefore, each primary component can be canceled by joining using the communication channel 53.
Therefore, since the primary component of the pressure pulsation can be reduced, the influence on the increase in the compression work input can be reduced, and the vibration noise released from the inside of the compression mechanism 99 can be reduced. Furthermore, the occurrence of vertical vibration of the electric motor 9 in the sealed container 8 can be suppressed by the primary component of the pressure pulsation.

However, since the pressure pulsation includes a high-order component, a secondary component or a higher-order component remains. In the present invention, the respective volumes of the first resonance small space 39 and the second resonance small space 49 are used. The Helmholtz resonance frequency may be designed by matching V and the communication channel dimension (length L, channel cross section S) with the frequency band to be absorbed and silenced.
In the first embodiment, the energy level of the pressure amplitude is designed so as to remove the secondary component having the second highest operating frequency primary component by Helmholtz resonance.
For example, it is assumed that the compressor operating condition is Pd / Ps = 1.2 MPa / 2.3 MPa, Ts = 35 ° C., operating frequency 60 Hz, and 2 horsepower class input under the R410A refrigerant air conditioning cooling rated condition.

In general, the operating frequency of the refrigerant compressor can be varied in a range of 10 Hz to 120 Hz by an inverter, but the first resonance small space 3 and the second resonance frequency are set so that Helmholtz resonance is achieved with a secondary component with a rated operating frequency of 60 Hz as a target. When the volume V of each of the two resonance small spaces 49 and the communication channel dimensions (length L, channel cross section S) are designed, the pipe diameter is 8 mm, the length is 60 mm, and the resonance port is small with one resonance channel. When the volume V of the space is 54 cc, the resonance frequency is 120 Hz. Usually, the discharge muffler of a rotary compressor needs to be designed to be larger than the inner diameter of the cylinder in order to cover the compression part, and since it functions as an expansion silencer, the volume is required to be about 200 cc, and a small space of about 54 cc is separately configured. To do.

Furthermore, in the first discharge muffler space 32, the first discharge port 16 is configured such that the refrigerant flows in an arc shape from the first discharge port 16 (partially circulates in an annular shape) and is discharged from the first discharge port 34a. To the first discharge port 34a can be designed as long as possible.
Similarly, in the second discharge muffler space 42, the second discharge muffler space 42 discharges the refrigerant from the second discharge passage 44 by flowing in a circular arc shape from the second discharge port 26 (partially circulating in the annular shape). The distance from the outlet 26 to the second discharge channel 44 can be designed as long as possible.
For this reason, the frequency region of the kHz band which causes a noise problem can be included as the expansion silencer. Further, the primary component and the secondary component of the operating frequency which are problematic in efficiency can reduce pressure pulsation loss by the communication channel 53 and the

Helmfortz resonance channels

51 and 52.

(Reduction of pressure loss)
Further, the plurality of

communication channels

51, 52, 53 are merged, and in particular, the third communication channel 53 having a low resistance is added, so that the space between the first discharge muffler space 32 and the second discharge muffler space 42 is added. With this structure, it is difficult to apply differential pressure. Furthermore, since the first discharge flow path 34 and the second discharge flow path 44 for discharging directly from the first discharge muffler space 32 and the second discharge muffler space 42 to the electric motor lower space 3b are provided, the pressure loss is reduced. It is a structure that is difficult to stick.

As described above, by using the hermetic twin compressor 100 of the first embodiment, it is possible to achieve both reduction of pressure loss and reduction of pressure pulsation, improvement of compressor efficiency, reduction of vibration noise, and improvement of reliability. Effect can be obtained.

[Embodiment 2]
FIG. 4 explains the configuration of a hermetic twin compressor according to Embodiment 2 of the present invention. FIG. 4 is a longitudinal sectional view, and FIG. 5 is a transverse sectional view (AA ′ section shown in FIG. 4). 6 is a cross-sectional view (BB 'cross section shown in FIG. 4). In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and one part description is abbreviate | omitted.
In the second embodiment, the walls of the first small space 39 and the second small space 49 are formed of a porous material, and the refrigerant gas can flow between the first discharge muffler 30 and the second discharge muffler 40. The point is different. The communication channel 53 that cancels the pressure fluctuation in the opposite phase between the first discharge muffler 30 and the second discharge muffler 40 is eliminated. However, the first resonance channel 51 and the second resonance channel 52 are different from each other in the first discharge muffler. 30 and the second discharge muffler 40 also serve as a communication channel that cancels out the pressure fluctuation in the opposite phase. Other configurations are the same as in the first embodiment, but the silencing effect due to Helmholtz resonance in the first small space 39 and the second small space 49 is somewhat reduced (about 10%). Further, because of the resistance passing through the first small space 39 and the second small space 49, the pressure pulsation reducing effect is reduced as compared with the communication flow path of the first embodiment.

As described above, by using the hermetic twin compressor 100 of the second embodiment, although the effect is slightly inferior to that of the first embodiment, it is possible to achieve both the reduction of pressure loss and the reduction of pressure pulsation. The effects of improving machine efficiency, reducing vibration noise, and improving reliability can be obtained.

[Embodiment 3]
7 explains the configuration of a hermetic twin compressor according to Embodiment 3 of the present invention. FIG. 7 is a longitudinal sectional view, and FIG. 8 is a transverse sectional view (AA ′ section shown in FIG. 7). 9 is a cross-sectional view (BB ′ cross section shown in FIG. 7). In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and one part description is abbreviate | omitted.
The third embodiment is different from the second embodiment in that the first small space 39 and the second small space 49 are eliminated. The first discharge muffler 30 and the second discharge muffler 40 also function as the resonance buffer space of the first small space 39 and the second small space 49. If the frequency for Helmholtz resonance is the operating frequency level (20 to 100 Hz), the normal discharge muffler volume level (200 cc or more) is established.

For example, assuming R410A refrigerant air conditioning cooling rated conditions, compressor operating conditions are Pd / Ps = 1.2 MPa / 2.3 MPa, Ts = 35 ° C., operating frequency 60 Hz, 2 horsepower class input, the energy level of pressure amplitude is It is designed to remove the second highest secondary component of the operating frequency primary component by Helmholtz resonance.
Generally, the operating frequency of the refrigerant compressor can be varied in the range of 10 Hz to 120 Hz by an inverter, but the first resonance is small so that the primary component and the secondary component become Helmholtz resonance with the rated operating frequency of 60 Hz as a target. The volume V of each of the space 3 and the second resonance small space 49 and the communication channel dimensions (length L, channel cross section S) are designed.

With one first resonance flow path, when the pipe diameter is 8 mm, the length is 60 mm, and the second discharge muffler volume V = 215 cc, the resonance frequency is 60 Hz. Further, when the pipe diameter is 14 mm, the length is 60 mm, and the volume V of the small space surrounding the resonance port is 150 cc with one second resonance channel, the resonance frequency is 120 Hz. Since the first discharge muffler and the resonance flow path 51 are designed to have a secondary component of 120 Hz, and the second discharge muffler and the resonance flow path 52 are set to have a primary component of 60 Hz, it is possible to cover two types of frequency components. .
Other configurations are the same as those of the first embodiment, but the silencing effect by Helmholtz resonance in the first small space 39 and the second small space 49 is reduced. Further, since the flow path area necessary for Helmholtz resonance is small, the pressure resistance to pass through increases, and the pressure pulsation reduction effect is reduced as compared with the communication flow path of the first embodiment.

[Embodiment 4]
FIG. 10 explains the configuration of a hermetic twin compressor according to Embodiment 4 of the present invention. FIG. 10 is a longitudinal sectional view, and FIG. 11 is a transverse sectional view (AA ′ section shown in FIG. 10). FIG. 12 is a transverse sectional view (BB ′ section shown in FIG. 10). In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and one part description is abbreviate | omitted.
In the fourth embodiment, there is only one resonance channel 54, the resonance port 54a on the first discharge muffler side is covered with the first small space 39 of the porous wall, and the resonance port 54b on the second discharge muffler side is porous. The point covered with the second small space 49 of the textured wall is different from the first embodiment. The functions of the

resonance channels

51 and 52 and the function of the communication channel 53 of the first embodiment are performed by a single resonance channel 54. Here, it is possible to cover two types of frequency components by making the volume of the first discharge muffler and the second discharge muffler about twice as large.

Generally, the operating frequency of the refrigerant compressor can be varied in the range of 10 Hz to 120 Hz by an inverter, but the first resonance is small so that the primary component and the secondary component become Helmholtz resonance with the rated operating frequency of 60 Hz as a target. The volume V of each of the space 3 and the second resonance small space 49 and the communication channel dimensions (length L, channel cross section S) are designed.
In the resonance flow path 54, when the pipe diameter is 5 mm, the length is 60 mm, and the volume V of the second small space surrounding the resonance port is V = 22 cc, the resonance frequency is 120 Hz. Further, when the volume V of the first small space surrounding the resonance port is V = 87 cc, the resonance frequency is 60 Hz.
Normally, the discharge muffler of a rotary compressor needs to be designed to be larger than the inner diameter of the cylinder so as to cover the compression portion, and since it functions as an expansion silencer, the volume is required to be about 200 cc, the first small space of 54 cc and 87 cc The second small space of the degree is configured separately. Here, the first discharge muffler and the resonance flow path 51 are designed to have a secondary component of 120 Hz, and the second discharge muffler and the resonance flow path 52 are set to a primary component of 60 Hz, so that two types of frequency components can be covered. Is possible.
Other configurations are the same as those of the first embodiment, but only one resonance channel 54 is provided, and the

resonance ports

54a and 54b pass through a small space. Compared to the three configurations, the effect of reducing pressure pulsation is reduced.

The compressor efficiency improvement effect obtained by the hermetic twin compressor 100 shown in Embodiments 1 to 3 varies depending on the type of refrigerant used in the vapor compression refrigeration cycle. That is, as the refrigerant operating at the hermetic twin compressor 100 has lower pressure and density, the ratio of power loss due to the generated pressure loss to the compressor input is larger, so the effect of improving the compressor efficiency is greater.
Low GWP (low global warming potential) refrigerants, such as HC refrigerants (isobutane, propane, propylene) and HFO1234yf, are lower in pressure and lower than CFC refrigerants (R410A, R22) that are currently used in the global market for air conditioning equipment. Since it operates at a density, it is particularly effective to improve compressor efficiency, reduce vibration noise, and improve reliability.

As described above, the first to third embodiments have described the hermetic twin compressor 100 assuming the rotary piston type rotary compressor. However, the present invention is not limited to this, and the swing piston type is another rotary compressor. Even in the case of a reciprocating type or scroll type, which is a compressor type other than the rotary type, sliding vane type, etc., if an accumulator is provided on the suction side, the effect of improving the compressor efficiency as in the first embodiment is achieved. can get.

[Embodiment 5]
FIG. 13 is a configuration diagram of a heat pump device according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and one part description is abbreviate | omitted.
In FIG. 13, the heat pump device (vapor compression refrigeration cycle device) 200 includes the hermetic twin compressor 100 shown in the first embodiment, the radiator 102, the expansion mechanism 103, and the evaporator 104, and ranks them. And a refrigerant pipe 105 that circulates the refrigerant by being connected.
Therefore, the heat pump device 200 can improve energy saving efficiency, reduce vibration noise, and improve reliability by using the hermetic twin compressor 100.

1: Compressor suction pipe, 2: Compressor discharge pipe, 3: Sealed container inner space, 3a: Lubricating oil storage part, 3b: Motor lower space, 3c: Motor upper space, 4: Suction muffler connecting pipe, 5: Medium Partition plate, 6: drive shaft, 7: suction muffler, 8: airtight container, 9: electric motor, 10: compression unit, 11: first cylinder, 11a: first cylinder chamber, 12: first rotating piston, 15: first 1 cylinder suction port, 16: first discharge port, 17: first discharge mechanism, 17a: first reed valve, 17b: first stopper, 18: first discharge valve concave installation portion, 20: second compression portion, 21 : Second cylinder, 21a: second cylinder chamber, 22: second rotary piston, 25: second cylinder suction port, 26: second discharge port, 27: second discharge mechanism, 27a: second reed valve, 27b: 2nd stopper, 28: 2nd discharge valve concave installation , 30: first discharge muffler, 31: first discharge muffler container, 32: first discharge muffler space, 34: first discharge flow path, 34a: discharge port, 34b: discharge port, 36: first discharge port inflow guide 37: first discharge port rear surface guide, 39: resonance small space, 40: second discharge muffler, 41: second discharge muffler container, 42: second discharge muffler space, 44: second discharge flow path, 46: first 2 discharge port inflow guide, 47: second discharge port rear surface guide, 49: second resonance small space, 51: resonance channel, 51a: resonance port, 51b: resonance port, 52: resonance channel, 52a: resonance port, 52b: resonance port, 54: resonance channel, 54a: resonance port, 54b: resonance port,
53: communication channel, 53a: communication port, 53b: communication port, 60: first support member, 61: first bearing portion, 62: first discharge port side surface, 70: second support member, 71: second Bearing part, 72: Side surface on second discharge port side, 99: Compression mechanism, 100: Sealed twin compressor, 102: Radiator, 103: Expansion mechanism, 104: Evaporator, 105: Refrigerant pipe, 110: Main body of indoor unit , 200: a heat pump device.

Claims

A sealed container;
An electric motor installed inside the sealed container;
A drive shaft that is rotationally driven by the electric motor and rotatably supported by the first support member and the second support member;
An intermediate partition plate disposed between the first support member and the second support member;
A first cylinder coupled to the drive shaft is movably accommodated, and a first cylinder that forms a first compression chamber between the first support member and the intermediate partition plate; and A first discharge port formed in the first support member that discharges the compressed refrigerant, and is installed in the first support member so as to cover the first discharge port, and is discharged from the first discharge port. A first muffler container that forms a first muffler space into which refrigerant flows;
A second piston that is movably accommodated in the second drive shaft and that forms a second compression chamber between the second support member and the intermediate partition plate; and A second discharge port formed in the second support member that discharges the compressed refrigerant, and is installed in the second support member so as to cover the second discharge port, and is discharged from the second discharge port. A second muffler container that forms a second muffler space into which the refrigerant flows;
A first discharge channel that directly guides the compressed refrigerant from the first muffler space to the inner space of the sealed container, and a second discharge channel that directly guides the compressed refrigerant from the second muffler space to the inner space of the sealed container A communication channel through which a refrigerant flows through the first muffler space and the second muffler space;
With
The hermetic function of reducing pressure pulsation by driving the first piston and the second piston in opposite phases and causing the refrigerant to flow through the communication flow path and the pressure amplitude to propagate. Compressor.
A first small space having a smaller volume than the first muffler space is provided in the first muffler space so as to cover the first communication port connected to the communication channel, or the communication channel is provided in the second muffler space. 2. The hermetic compressor according to claim 1, further comprising a second small space having a volume smaller than that of the first muffler space so as to cover the second communication port connected to the first muffler space.
The length d and the diameter D of the communication channel are set so that the volume of the first small space or the volume of the second small space resonates with the primary component f of the operating frequency.
Resonance frequency: f = (c / 2π) × (S / (L × V)) 0.5
L: Opening effective length (= d + k × D)
c: refrigerant gas sound speed,
S: opening area (= πD 2/4),
V: Buffer container volume Correction factor: k (approximately 1.57 × 0.5, ie, in the range of 7.5 to 0.8)
The multi-cylinder compressor according to claim 2, wherein the multi-cylinder compressor is defined so as to satisfy.
First communication not having two or more communication channels, and covering the first communication port side in the first muffler space with the first small space and not covering the second communication port side with the second small space. A flow path, and a second communication flow path that covers the second communication port side in the second muffler space with the second small space and does not cover the first communication port side with the first small space. The hermetic compressor according to claim 2, wherein
In addition to the first communication channel and the second communication channel, a communication channel that does not cover the first communication port and the second communication port in a small space is provided. The hermetic compressor according to claim 4.
The pressure loss at which the refrigerant discharged from the first discharge port flows out from the first discharge channel to the internal space of the sealed container is less than the pressure loss at which the refrigerant flows out to the internal space of the sealed container through the communication channel. Further, the pressure loss at which the refrigerant discharged from the second discharge port flows out from the second discharge channel to the inner space of the sealed container is reduced to the inner space of the sealed container through the communication channel. The hermetic compressor according to claim 1, wherein the hermetic compressor is smaller than the pressure loss flowing out.
Comparing the pressure loss that occurs until the gaseous refrigerant flows into and out of the pipeline, the pressure loss that occurs in the communication channel is the pressure loss that occurs in the first discharge channel and the second discharge channel The hermetic compressor according to claim 6, wherein the hermetic compressor is smaller than the pressure loss.
The first muffler space is annular, and a first discharge port rear surface guide that divides the first muffler space is installed,
The first discharge port rear surface guide is free to pass a refrigerant, and is disposed between the first discharge port and the first discharge channel,
The refrigerant discharged from the first discharge port flows along the annular flow path toward the first discharge port without passing through the first discharge port rear surface guide, thereby forming an expansion silencer. The hermetic compressor according to claim 1, wherein
The second muffler space is annular, and a second discharge port rear surface guide that divides the second muffler space is installed,
The second discharge port rear surface guide is free to pass the refrigerant, and is disposed between the second discharge port and the second discharge channel,
The refrigerant discharged from the second discharge port flows along the annular flow path toward the second discharge port without passing through the second discharge port rear surface guide, thereby forming an expansion silencer. The hermetic compressor according to claim 1, wherein
2. The hermetic compressor according to claim 1, wherein the volume of the first muffler space is greater than or equal to twice or less than ½ times the volume of the second muffler space.
A hermetic compressor according to any one of claims 1 to 10, a condenser, a decompression unit, an evaporator, and a refrigerant circuit for sequentially circulating the refrigerant by connecting them together. Refrigeration cycle equipment.