JPH01247776A - Piping structure of multi-cylinder type compressor and gas-liquid separator - Google Patents

Abstract

PURPOSE:To simplify structure, etc., supplying refrigerant gas unifromly to respective cylinders by a method wherein refrigerant gas separated from liquid in a separator main body is fed to a number of cylinders of a compressor main body via one feed-out tube and a number of branch inlet tubes. CONSTITUTION:A multi-cylinder type compressor 1 is equipped with a plurality of cylinders 3a, 3b inside a closed vessel 2. On the other hand, a gas-liquid separator 10 is so constituted that evaporated refrigerant is fed into a separator main body 11. In this case, one feed-out tube 12 which feeds out refrigerant gas after gas-liquid separation is connected inside the separator main body 11. Ends of a plurality of branch inlet tubes 13a, 13b are connected to the ends of the feed-out tube 12 protruding from the bottom of the separator main body 11. The other ends of the respective branch inlet tubes 13a, 13b are fitted into the respective guide inlet ports 14a, 14b provided in the closed vessel 2 and then connected to the respective cylinders 3a, 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement in the piping structure between a multi-cylinder compressor and a gas-liquid separator in a refrigeration cycle.

(Prior art) In a refrigeration cycle, multiple cylinders (
There is a tendency for multi-cylinder compressors (hereinafter simply referred to as compressors) to be frequently used, which are equipped with two cylinders (usually two cylinders) and each cylinder is provided with a compression mechanism to perform a compression action at the same time. That is, this type of compressor is advantageous because it can perform the compression work of two compressors in the space of one compressor. Immediately before introducing refrigerant gas into such a compressor, a gas-liquid separator for separating refrigerant gas into gas and liquid is connected in order to prevent liquid compression in the compressor. Conventionally, the piping structure between the gas-liquid separator and the multi-cylinder compressor is shown in FIG.

In the figure, reference numeral 1 denotes a compressor, which includes, for example, two cylinders 3a and 3b in a closed container 2, and compresses refrigerant gas in each cylinder 3a and 3b by a compression mechanism (not shown). It has become. Reference numeral 4 denotes a gas-liquid separator, which has a separator main body 5 of a sealed structure usually made of iron plate material, to which an inlet pipe (not shown) is connected to introduce the refrigerant evaporated in the evaporator. This separator main body 5 houses a gas-liquid separation mechanism that separates the introduced refrigerant gas into gas and liquid, and is connected to two outlet pipes 6a and 6b that lead out the refrigerant gas after the gas-liquid separation. These lead-out pipes 6a and 6b are made of ordinary steel pipes, stand vertically within the separator main body 5, protrude from the bottom surface of the separator main body 5, and are bent in a substantially horizontal direction. and an outlet pipe 5a.

6b penetrates through the gaitor body 7a, 7b provided on the side surface of the airtight container 2 of the compressor 1, and connects each cylinder 3a, 3b.
connected to.

Therefore, the refrigerant gas introduced into the separator main body 5 and subjected to gas-liquid separation there is passed through each outlet pipe 6a.

6b into the respective cylinders 3a, 3b.

(Problem to be Solved by the Invention) However, in such a piping structure, the same number of outlet pipes as the number of cylinders of the compressor are inserted and connected into the separator body of the gas-liquid separator. The structure of the liquid separator itself is complicated, its manufacturability is poor, and the amount of steel pipes and silver solder that account for a large proportion of the manufacturing cost is increased, making it expensive. Furthermore, in order to downsize the compressor 1, the distance between the cylinders 3a and 3b is made as small as possible. On the other hand, the outlet pipes 6a and 6b pass through the closed container 2 with the same large diameter as inside the separator main body 5. Therefore, there are problems such as a narrow spacing between the gyroscope bodies 7a and 7b, which are the connecting portions of the lead-out pipes 6a and 6b to the closed container 2, and poor brazing workability.

The present invention has been made in view of the above circumstances, and particularly simplifies the structure of a gas-liquid separator to improve manufacturability.
The object of the present invention is to provide a piping structure for a multi-cylinder compressor and a gas-liquid separator that can reduce the amount of steel pipes and silver solder required for piping and improve piping workability.

[Structure of the invention]

(Means for Solving the Problems) That is, the present invention provides a gas-liquid separator that separates refrigerant gas into gas and liquid, and a multi-cylinder compressor that includes multiple cylinders and performs a compression action by sucking refrigerant gas into each cylinder. A single outlet pipe is connected to the separator body of the gas-liquid separator to lead out the refrigerant gas separated into the gas and liquid within the separator body, and a plurality of branch suction pipes are connected to this outlet pipe. A multi-cylinder compressor, characterized in that the refrigerant gas is introduced and guided into each cylinder of the multi-cylinder compressor, and the diameter of each branch suction pipe is smaller than the diameter of the outlet pipe. This is the piping structure between the gas-liquid separator and the gas-liquid separator.

(Function) The refrigerant gas separated into gas and liquid in the separator body of the gas-liquid separator is introduced and guided from the outlet pipe through each branch suction pipe into each cylinder of the multi-cylinder compressor. Moreover, an equal amount of refrigerant gas can be supplied to each cylinder from each branch suction pipe.

(Example) Hereinafter, an example of the present invention will be described based on FIG. The multi-cylinder compressor 1 has exactly the same structure as those used up to now, and includes, for example, two cylinders 3a and 3b in a closed container 2, and uses a compression mechanism (not shown) to compress refrigerant in each cylinder 3a and 3b. The same applies to compressing gas. In the figure, reference numeral 10 denotes a gas-liquid separator, in which an inlet pipe (not shown) is connected to the separator main body 11, which has a sealed structure made of iron plate material similar to the conventional one, to introduce the refrigerant evaporated in the evaporator. ing. Further, inside this separator main body 11, a gas-liquid separation mechanism for separating the introduced refrigerant gas into gas and liquid is housed, and a single outlet pipe 12 is connected to lead out the refrigerant gas after the gas-liquid separation. Ru.

This outlet pipe 12 is made of ordinary steel pipe, and the separator main body 1
1 is in an upright position along the vertical direction, and protrudes from the bottom of the separator body 11. A first branch suction pipe 13a and a second branch suction pipe 13b are provided at the protruding end of the outlet pipe 12.
is connected. To explain, the first branch suction pipe 13a extends directly from the end of the outlet pipe 12 in the horizontal direction, and the middle part thereof is connected to the first branch suction pipe 13a provided on the side of the airtight container 2.
The opening end communicates with the inside of the upper cylinder 3a. The second branch suction pipe 13b once extends downward from the end of the outlet pipe 12, and then is bent in the horizontal direction.
The middle part thereof is inserted into the gaitoro body 14b, and the open end thereof communicates with the inside of the cylinder 3b on the lower side. The above outlet pipe 1
2 and 1st. second branch suction pipes 13a, 13b, the first
．． The second branch suction pipes 13a, 13b and the first branch suction pipes 13a, 13b. Second gaitor body 14a.

14b is connected by silver brazing. Also, 1st. If the second branch suction pipes 13a and 13b have the same diameter φd, and the diameter of the outlet pipe 12 is φD, then the relationship φd × φD must be established.

Thus, the refrigerant gas introduced into the separator main body 11 of the gas-liquid separator 10 is separated into gas and liquid, and further guided to the outlet pipe 12. Then, from the outlet pipe 12 to each branch suction pipe 1
It is sucked and guided into each cylinder 3a, 3b via 3a, 13b, and compressed inside each cylinder.

Since the outlet pipe 12 is unified in this way, the gas-liquid separator 1
0 structure is simplified, and the amount of steel pipes and silver solder used can be reduced. Also, 1st. Second branch suction pipe 13a, 1
Since the diameter of the pipe 3b is made smaller than the diameter of the outlet pipe 12, the distance between the parts of the compressor 1 that penetrates the hermetic container 2 is widened, making it easier to connect them to each other.

Note that the outlet pipe 12A as shown in FIG. 2 may be used. That is, this outlet pipe 12A rises in the vertical direction within the separator body 11 as in the above embodiment, and
It protrudes from the bottom and is bent horizontally. A bifurcated connecting portion 15 is integrally provided at this bent end. As shown in FIG. 3, the cross-sectional shape of the connecting portion 15 has circular portions spaced vertically at a predetermined interval. As shown again in FIG. 2, the connecting portion 15 has a first. Second branch suction pipes 13a, 13b are connected, which penetrate through the closed container 2 and communicate into each cylinder 3a, 3b. The diameter of the outlet pipe 12A is φD, and each branch suction pipe 13
The diameters of a and 13b are φd, and the relationship φD>φd is the same as in the above embodiment, and the same effects are achieved.

Furthermore, a piping structure as shown in FIG. 4 may be used. That is, when the diameter of the outlet pipe 2o is φD, the diameter of the first branch suction pipe 21a on the upper side is φdl+the diameter of the second branch suction pipe 21b on the lower side is φd2, and the relationship between them is φD> Setting is made so that φd,>φd2 holds true.

Moreover, one end of the first branch suction pipe 21a projects into the outlet pipe 20 by one dimension and is cut diagonally.

Therefore, the refrigerant gas led out from the outlet pipe 20 falls directly to the lower end and is led out from the second branch suction pipe 21b. However, on the way, the first branch suction pipe 21a efficiently receives the cut open end and guides it to the cylinder 3a. However, the diameter φd of the first branch suction pipe 21a,
is larger than the diameter φd2 of the second branch suction pipe 21b, so the first. The second branch suction pipes 21a, 21b are connected to each other with an amount of refrigerant gas, thereby making it possible to equalize the amount of suction gas in each cylinder 3a, 3b.

It goes without saying that various other modifications can be made without departing from the gist of the present invention.

(Effects of the Invention) As explained above, according to the present invention, since there is only one outlet pipe, the structure of the gas-liquid separator is simplified, and the amount of steel pipes and silver solder required for piping is reduced. and obtain overall cost reductions. Furthermore, since the diameter of each branch suction pipe is made smaller than the diameter of the outlet pipe, the connection work at the connection part to the outlet pipe and the connection part to the airtight container of the compressor becomes easier, which improves work efficiency. play.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the piping structure of a multi-cylinder compressor and a gas-liquid separator showing one embodiment of the present invention, and FIG. 2 is a diagram illustrating a multi-cylinder compressor and a gas-liquid separator showing another embodiment of the present invention. A diagram explaining the piping structure with the gas-liquid separator, Figure 3 is a longitudinal sectional view taken along the line ■-■ in Figure 2, and Figure 4 shows the piping between a different multi-cylinder compressor and the gas-liquid separator. FIG. 5 is a diagram illustrating a piping structure between a multi-cylinder compressor and a gas-liquid separator according to a conventional example of the present invention. 10... Gas-liquid separator, 3a, 3b... Cylinder, 1
...Multi-cylinder compressor, 11...Separator main body, 1
2... Outlet pipe, 13a, 13b... Branch suction pipe. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] A device that communicates between a gas-liquid separator that separates refrigerant gas into gas and liquid, and a multi-cylinder compressor that has multiple cylinders and performs a compression action by sucking refrigerant gas into each cylinder, in which the separation of the gas-liquid separator is performed. one lead-out pipe connected to the separator body to lead out the refrigerant gas separated into gas and liquid within the separator body; and a plurality of lead-out pipes connected to this lead-out pipe to introduce and guide the refrigerant gas into each cylinder of the multi-cylinder compressor. A piping structure for a multi-cylinder compressor and a gas-liquid separator, characterized in that the diameter of each branch suction pipe is smaller than the diameter of the outlet pipe.