WO2017103988A1

WO2017103988A1 - Compressor for dual refrigeration device, and dual refrigeration device

Info

Publication number: WO2017103988A1
Application number: PCT/JP2015/085036
Authority: WO
Inventors: 和幸塚本
Original assignee: 三菱電機株式会社
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2017-06-22
Also published as: JP6522156B2; JPWO2017103988A1

Abstract

To provide a compressor for a dual refrigeration device for the purpose of achieving a small and light-weight dual refrigeration device, and a dual refrigeration device equipped with the compressor. A compressor relating to the present invention is provided with: one electric motor; a first compression mechanism unit for compressing a first refrigerant using the electric motor; a second compression mechanism unit for compressing a second refrigerant using the electric motor, said second refrigerant being different from the first refrigerant; and a partition wall that separates the first compression mechanism unit and the second compression mechanism unit from each other.

Description

Compressor for binary refrigeration equipment and binary refrigeration equipment

The present invention relates to a compressor for a binary refrigeration apparatus including one electric motor and two compression mechanisms, and having a refrigerant circuit using two different refrigerants on the high-end side and the low-end side and a cascade heat exchanger, and the compressor The present invention relates to a binary refrigeration apparatus equipped with a compressor.

2. Description of the Related Art Conventionally, a binary refrigeration apparatus is known as an apparatus for performing cooling in a low temperature range of minus several tens of degrees used for freezing fresh fish. The binary refrigeration apparatus includes a high-side refrigerant circuit for circulating the high-temperature side refrigerant and a low-side refrigerant circuit for circulating the low-temperature side refrigerant. It has the cascade heat exchanger comprised so that heat could be exchanged with the condenser in a side refrigerant circuit.
This binary refrigeration apparatus includes a refrigerant compressor in each of a high-side refrigerant circuit and a low-side refrigerant circuit (see, for example, Patent Document 1).

Japanese Patent No. 5119513

The generally known binary refrigeration apparatus requires a refrigerant compressor in each of the high-source refrigerant circuit and the low-source refrigerant circuit. For this reason, the binary refrigeration apparatus is equipped with at least two compressors, and there is a problem that the main body of the binary refrigeration apparatus becomes large. Further, since at least two compressors are mounted, there is a problem that the mass becomes heavy.

As a result, in order to transport a large-sized, large mass binary refrigeration system to the installation location, there is a problem that a large amount of fuel is consumed and the environmental load increases. Furthermore, due to the increase in size and weight, there is a problem that it is necessary to secure a wide installation space for the binary refrigeration apparatus and to secure the strength of the foundation of the installation location. In addition, since at least two compressors are mounted, there is a problem that the manufacturing cost becomes expensive.

The present invention solves the above-mentioned problems, and a main object is to provide a compressor for a binary refrigeration apparatus for realizing a compact, lightweight, and inexpensive binary refrigeration apparatus, and a compressor equipped with the compressor. An original refrigeration apparatus is provided.

In the compressor for a binary refrigeration apparatus according to the present invention, one electric motor, a first compression mechanism that compresses the first refrigerant by the electric motor, and a second refrigerant that is different from the first refrigerant by the electric motor. And a partition wall that separates the first compression mechanism portion and the second compression mechanism portion from each other.

According to the present invention, since there is one compressor for the binary refrigeration apparatus, it is possible to reduce the size and weight compared to the conventional binary refrigeration apparatus. As a result, it is possible to reduce the environmental burden in transportation, save installation space, and simplify foundation work. Furthermore, an inexpensive binary refrigeration apparatus can be provided.

The basic structure of the binary refrigeration apparatus using the compressor for binary refrigeration apparatuses which concerns on Embodiment 1 of this invention is represented. 1 is a schematic configuration diagram of a compressor for a binary refrigeration apparatus according to Embodiment 1 of the present invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigerating apparatuses which concerns on Embodiment 1 of this invention. It is a schematic block diagram of the compressor for binary refrigerating apparatuses which concerns on Embodiment 2 of this invention. It is a schematic block diagram of the compressor for binary refrigeration apparatus which concerns on Embodiment 3 of this invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 3 of this invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 3 of this invention. It is a schematic block diagram of the compressor for two-dimensional refrigeration equipment concerning Embodiment 4 of the present invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 4 of this invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 4 of this invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 4 of this invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 4 of this invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 4 of this invention. It is a schematic block diagram of the other structural example of the compressor for binary refrigeration apparatuses which concerns on Embodiment 4 of this invention.

Hereinafter, a compressor for a binary refrigeration apparatus according to an embodiment of the present invention will be described. In addition, this invention is not limited by this embodiment. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

[Embodiment 1]
FIG. 1 shows a basic configuration of a binary refrigeration apparatus using a compressor for a binary refrigeration apparatus according to Embodiment 1 of the present invention. The binary refrigeration apparatus 60 includes a high-side refrigerant circuit 32 and a low-side refrigerant circuit 34.
The high-end side refrigerant circuit 32 includes a high-end side compression mechanism section 2 of a compressor for a binary refrigerating apparatus (hereinafter referred to as a compressor 1), a high-end side condenser 40, a high-end side expansion mechanism 43, The former side evaporator 53 is connected by piping.
The low-side refrigerant circuit 34 connects the low-side compression mechanism 3 of the compressor 1, the low-side condenser 52, the low-side expansion mechanism 54, and the low-side evaporator 56 with piping. The high-side evaporator 53 and the low-side condenser 52 constitute a cascade heat exchanger 36.
Note that the refrigerant used in the high-side refrigerant circuit 32 and the refrigerant used in the low-side refrigerant circuit 34 are not the same. Further, the binary refrigeration apparatus 60 shown in FIG. 1 has a basic configuration, and the binary refrigeration apparatus 60 may include a liquid receiver, an oil separator, an accumulator, and the like.

The operation of the high-source side refrigerant circuit 32 will be described. The high-temperature and high-pressure refrigerant gas compressed by the high-side compression mechanism unit 2 enters the high-side condenser 40, performs heat exchange with water or air, condenses, and becomes a high-pressure refrigerant liquid. Here, the high-end side condenser 40 may be either a water-cooled type that exchanges heat with cooling water or an air-cooled type that exchanges heat with air. Here, a case where heat is exchanged with cooling water is shown as an example. The refrigerant liquid that has exited the high-side condenser 40 is decompressed by the high-side expansion mechanism 43 to become a low-temperature and low-pressure refrigerant liquid. The low-temperature and low-pressure refrigerant liquid enters the high-side evaporator 53. Here, heat is exchanged with the low-temperature side high-temperature and high-pressure refrigerant gas to be vaporized to become a low-temperature and low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas is sucked into the high-side compression mechanism unit 2.

The operation of the low-source side refrigerant circuit 34 will be described. The high-temperature and high-pressure refrigerant gas compressed by the low-source side compression mechanism unit 3 enters the low-source side condenser 52, exchanges heat with the low-temperature and low-pressure refrigerant liquid on the high-source side, condenses, and condenses the high-pressure refrigerant liquid. It becomes. Here, the low-source side condenser 52 may be any type including a shell and tube type, a plate heat exchanger, and a double pipe type heat exchanger. The refrigerant liquid that has exited the low-side condenser 52 is decompressed by the low-side expansion mechanism 54 and becomes a low-temperature and low-pressure refrigerant liquid. The low-temperature / low-pressure refrigerant liquid enters the low-source evaporator 56. Here, it is vaporized by heat exchange with antifreeze (generally referred to as “brine”) and air, and becomes a low-temperature and low-pressure refrigerant gas. Here, a case where heat is exchanged with brine is shown as an example. The low-temperature / low-pressure refrigerant gas is sucked into the low-source compression mechanism unit 3.

FIG. 2 is a schematic configuration diagram of the compressor for the binary refrigeration apparatus according to Embodiment 1 of the present invention.
In the compressor 1 according to Embodiment 1 of the present invention, the low-side compression mechanism 103 and the high-side compression mechanism 104 are arranged on the rotor shaft 102 of the electric motor 101. The arrangement of the compression mechanism in FIG. 2 is the same as that of a compressor generally called a two-stage compressor. However, the two-stage compressor operates with a single refrigerant, and its function is to suck in the low-temperature / low-pressure refrigerant gas and then compress it in the low-stage compression section, and then suck in the high-stage compression section to generate high-temperature / high-pressure. The refrigerant gas is discharged.
On the other hand, the compressor 1 includes a partition wall 105 and a shaft seal 107 between the low-side compression mechanism unit 103 and the high-side compression mechanism unit 104, so that the low-source refrigerant and the high-source refrigerant are not mixed. It has become. That is, the low-side compression mechanism 103 and the high-side compression mechanism 104 separated by the partition wall 105 and the shaft seal 107 each have a suction port and a discharge port, and suck and discharge different refrigerants. .

FIG. 3 is a schematic configuration diagram of another configuration example of the compressor for a binary refrigeration apparatus according to Embodiment 1 of the present invention. In the compressor 1 of FIG. 3, a low-side compression mechanism 103 and a high-side compression mechanism 104 are arranged on the rotor shafts on both sides of the electric motor 101, respectively. A partition wall 105 and a shaft seal 107 are provided between the electric motor 101 and the high-side compression mechanism 104. Although the electric motor 101 is arranged in the refrigerant space of the low-side compression mechanism unit 103, the electric motor 101 may be arranged in the refrigerant space of the high-side compression mechanism unit 104. In that case, the partition wall 105 and the shaft seal 107 are provided between the electric motor 101 and the low-side compression mechanism 103.
By disposing the compression mechanism portions on both sides of the electric motor 101, the axial load (thrust load) generated by the compressed high-temperature and high-pressure refrigerant gas is offset, and the thrust bearing is downsized.

Note that the positions of the low-side compression mechanism unit 103 and the high-side compression mechanism unit 104 may be reversed. The compression method of the high-side compression mechanism unit and the low-side compression mechanism unit may be any of a reciprocating type, a rotary type, and a speed type, and the high-side compression mechanism unit and the low-side compression unit It is not essential that the mechanism part is the same. That is, even if the high-end compression mechanism is a screw type and the low-end compression mechanism is a reciprocating type, the effects of the present invention are not impaired. These aspects also apply to other embodiments described below.

In the compressor 1 according to Embodiment 1 of the present invention, the low-side compression mechanism unit 103 and the high-side compression mechanism unit 104 are provided in a single casing, so that the binary refrigeration apparatus includes a single compressor. Can be configured. Therefore, it is possible to realize a small, light and inexpensive binary refrigeration apparatus.

[Embodiment 2]
FIG. 4 is a schematic configuration diagram of a compressor for a binary refrigeration apparatus according to Embodiment 2 of the present invention.
In the compressor 1 according to the second embodiment, the high-side compression mechanism 104 and the low-side compression mechanism 103 are respectively arranged on the rotor shafts on both sides of the electric motor 101. A partition wall 105 and a shaft seal 107 are provided between the electric motor 101 and the high-side compression mechanism 104 and the low-side compression mechanism 103, respectively.

In the compressor 1 according to the second embodiment, the low-side compression mechanism unit 103 and the high-side compression mechanism unit 104 are not adjacent to each other by disposing the electric motor 101 in the center. Therefore, the compressor 1 according to the second embodiment can suppress the possibility of mixing the high and low refrigerants due to the wear of the shaft seal 107 as compared with the compressor 1 according to the first embodiment.
Further, by arranging the compression mechanism portions on both sides of the electric motor 101, the axial load (thrust load) generated by the compressed high-temperature / high-pressure refrigerant gas is offset, and the thrust bearing can be downsized.
The motor chamber 108 that houses the motor 101 may be either a low-source refrigerant space that has a large motor cooling effect or a high-source refrigerant space to avoid low-temperature brittleness of the motor material. .

[Embodiment 3]
FIG. 5 is a schematic configuration diagram of a compressor for a binary refrigeration apparatus according to Embodiment 3 of the present invention.
In the compressor 1 according to the third embodiment of the present invention, the electric motor chamber 108 that is the refrigerant space in the compressor 1 according to the second embodiment can be replaced with either the low-source refrigerant space or the high-source refrigerant space. Instead, it is an open space. That is, it is a configuration generally called “open type”.
In this configuration, even if the shaft seal 107 does not function due to wear, the high-source refrigerant and the low-source refrigerant are not directly mixed.

6 and 7 are schematic configuration diagrams of other configuration examples of the compressor for a binary refrigeration apparatus according to Embodiment 3 of the present invention. The compressor 1 of FIG. 6 installs the electric motor 101 that was in the refrigerant space in the compressor 1 according to Embodiment 1 in the open air space. The compressor 1 in FIG. 7 is configured such that the motor 101 that is in the refrigerant space in the compressor 1 according to the first embodiment is installed in the open air space, and the low-side compression mechanism unit 103 and the high-side compression mechanism Each refrigerant space of the section 104 is made into an independent space by a shaft seal 107.

[Embodiment 4]
FIG. 8 is a schematic configuration diagram of a compressor for a two-dimensional refrigeration apparatus according to Embodiment 4 of the present invention. The compressor 1 according to the fourth embodiment is one of the compressors 1 according to the first to third embodiments of the present invention, in which the rotor shaft 102, the low-side compression mechanism unit 103, and the high-side compression mechanism unit 104 are used. Are operatively connected by a low-side gear 109 and a high-side gear 110. That is, the rotation speeds of the low-side compression mechanism 103 and the high-side compression mechanism 104 can be changed by the low-side gear 109 and the high-side gear 110. The low original gear 109 and the high original gear 110 increase the rotational speed of the low original side compression mechanism 103 and the high original side compression mechanism 104 to increase the speed, whereby the compressor according to the first to third embodiments. 1 compression capability can be improved.

9 to 14 are schematic configuration diagrams of other configuration examples of the compressor for the binary refrigeration apparatus according to Embodiment 4 of the present invention. The compressor 1 shown in FIG. 9 includes a low-side gear 109 and a high-side gear in the compressor 1 in which the low-side compression mechanism 103 and the high-side compression mechanism 104 are arranged on the rotor shafts 102 on both sides of the electric motor 101. 110 is provided in the motor chamber 108. The compressor 1 shown in FIGS. 10 to 12 is obtained by operatively connecting a low-side gear 109 and a high-side gear 110 to an electric motor 101 installed in an atmospheric space. 110 represents an example installed in the refrigerant space or the atmospheric space. 13 and 14 is a compressor 1 in which a partition wall 105 and a shaft seal 107 are provided between a low-side compression mechanism unit 103 and a high-side compression mechanism unit 104. 1 represents an example having 109 and a high-side gear 110.

[Embodiment 5]
The compressor for a two-dimensional refrigeration apparatus according to Embodiment 5 of the present invention is one of the compressors 1 according to Embodiments 1 to 4 of the present invention, in which the motor 101 is an inverter 111 (not shown). It is driven. The inverter 111 can increase or decrease the rotational speed of the electric motor 101 and can change the rotational speeds of the low-side compression mechanism unit 103 and the high-side compression mechanism unit 104, so that the compression capacity can be improved. Further, by performing the deceleration operation, it is possible to improve the efficiency during the capacity control as compared with the case where the capacity control is mechanically performed.

[Embodiment 6]
A compressor for a two-dimensional refrigeration apparatus according to Embodiment 6 of the present invention is any one of the compressors 1 according to Embodiments 1 to 5, and includes a global warming potential ( A refrigerant having a low GWP value is used. In response to the recent global environmental problems, while switching to refrigerants with low GWP values is progressing, R404A, the mainstream of low-temperature refrigerants, has a GWP value of 3,943 (IPCC fifth report calculation value) Very big. For example, if HFO refrigerant, which is a low GWP refrigerant, or R1234yf (less than GWP value = 1: IPCC fifth report calculation value) is used as the high-source refrigerant, and carbon dioxide (GWP value = 1) is used as the low-source refrigerant. The environmental impact will be greatly improved.

As described above, the compressor for a two-dimensional refrigeration apparatus according to Embodiments 1 to 6 of the present invention has been shown, but as a result, the compressor has only one casing. In addition, since the high and low compression units are driven by one electric motor, the function of two compressors in the conventional binary refrigeration apparatus can be achieved by one compressor. For this reason, the refrigeration apparatus main body can also be reduced in size and weight, which can contribute to the reduction of the environmental load in transportation. In addition, since the compressor is configured with a single housing, it can be configured at a lower cost than two conventional compressors.

1 compressor, 2 high side compression mechanism, 3 low side compression mechanism, 32 high side refrigerant circuit, 34 low side refrigerant circuit, 36 cascade heat exchanger, 40 high side condenser, 43 high source Side expansion mechanism, 52 Low-side condenser, 53 High-side evaporator, 54 Low-side expansion mechanism, 56 Low-side evaporator, 60 Two-way refrigeration system, 101 Electric motor, 102 Rotor shaft, 103 Low-side compression Mechanism part, 104 High-end side compression mechanism part, 105 Bulkhead, 107 Shaft seal, 108 Motor room, 109 Low-side gear, 110 High-side gear, 111 Inverter.

Claims

One motor,
A first compression mechanism that compresses the first refrigerant by the electric motor;
A second compression mechanism that compresses a second refrigerant different from the first refrigerant by the electric motor;
A compressor for a binary refrigeration apparatus, comprising: a partition wall that separates the first compression mechanism portion and the second compression mechanism portion.
The first compression mechanism part and the second compression mechanism part are accommodated in one housing,
The compressor for a binary refrigeration apparatus according to claim 1, wherein the partition separates the first compression mechanism portion and the second compression mechanism portion within the casing.
The first compression mechanism unit and the second compression mechanism unit are housed in separate housings,
The compressor for a binary refrigeration apparatus according to claim 1, wherein the housing acts as a partition wall.
The compressor for a binary refrigeration apparatus according to claim 2 or 3, wherein the electric motor is installed in the casing in a state of being open to the atmosphere.
The electric motor comprises a rotor shaft;
The first compression mechanism portion and the second compression mechanism portion are disposed adjacent to each other on the rotor shaft;
The compressor for a dual refrigeration apparatus according to any one of claims 1 to 4, further comprising a partition wall and a shaft seal between the first compression mechanism section and the second compression mechanism section.
The electric motor includes a rotor shaft penetrating the electric motor;
The first compression mechanism portion and the second compression mechanism portion are respectively disposed on the rotor shafts on opposite sides facing each other with the electric motor interposed therebetween,
The compressor for a dual refrigeration apparatus according to any one of claims 1 to 4, further comprising a partition wall and a shaft seal between the first compression mechanism section, the second compression mechanism section, and the electric motor.
The compression for a binary refrigeration apparatus according to any one of claims 1 to 6, further comprising a gear between the rotor shaft and one or both of the first compression mechanism section and the second compression mechanism section. Machine.
The compressor for a binary refrigeration apparatus according to any one of claims 1 to 7, wherein a low GWP refrigerant is used for one or both of the first refrigerant and the second refrigerant.
The compressor for a binary refrigeration apparatus according to any one of claims 1 to 7, wherein a natural refrigerant is used for one or both of the first refrigerant and the second refrigerant.
The compressor for a binary refrigeration apparatus according to any one of claims 1 to 7, wherein a low GWP refrigerant is used for one of the first refrigerant and the second refrigerant, and a natural refrigerant is used for the other. .
A compressor, a high-end side condenser, a high-end side expansion mechanism, and a cascade heat exchanger evaporator are connected in order to circulate refrigerant, and the compressor and the cascade heat exchanger condenser And a low-side expansion mechanism and a low-side side evaporator are connected in order, and a low-side refrigerant circuit including a low-side refrigerant circuit in which the refrigerant circulates,
A binary refrigeration apparatus in which the compressor is mounted with the compressor for a binary refrigeration apparatus according to any one of claims 1 to 10.