JPH0541907B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a refrigerator having multiple pressure stages, a compressor and a condenser, and which functions as an economizer when operating in series and as a condenser when operating a low pressure stage alone. This relates to intermediate compressors for

[Conventional technology]

Conventionally, in a condenser for this type of refrigerator, in the case of series operation, the return refrigerant liquid from the high-pressure stage condenser flashes, and the refrigerant in a gas-liquid mixed state flows into the condenser.
The separated flash refrigerant gas is sucked into the high-pressure stage compressor from the refrigerant gas outlet, and is again led to the high-pressure stage condenser.

[Problem that the invention seeks to solve]

However, in such conventional systems, flash gas mixed with liquid droplets is ejected into the condenser from the gas-liquid mixed refrigerant inlet.
These droplets are easily sucked into the high-pressure stage compressor from the refrigerant gas outlet provided at the top of the shell along with the gas.
This caused problems with compressor operation.

Even if an attempt was made to install an eliminator below the upper refrigerant gas outlet to solve this problem, the cooling water pipes in the condenser are installed near the top of the shell, so the eliminator area cannot be taken up sufficiently, and the In order to provide a wide eliminator, a large space must be provided above the shell, resulting in an increase in the size of the shell.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a condenser for a refrigerator in which droplets are not sucked into the high-pressure stage compressor, and the shell size is prevented from increasing and the device can be made more compact. It is something to do.

[Means for solving problems]

As a means for solving the above problems, the present invention provides a condenser for a refrigerator having a compressor with multiple pressure stages, a condenser with multiple pressure stages, and an evaporator,
In an intermediate-pressure condenser that has a refrigerant gas outlet at the top and a refrigerant liquid outlet at the bottom, and which also functions as an economizer by switching the operating mode, the intermediate-pressure condenser has a refrigerant gas that returns from the high-pressure stage condenser and is flushed. A gas-liquid mixed refrigerant inlet of the gas-liquid mixed refrigerant is provided between the refrigerant gas outlet and the refrigerant liquid outlet, and faces near the gas-liquid mixed refrigerant inlet to reflect the flow of the gas-liquid mixed refrigerant and direct it downward. A downward biasing plate is connected to the inner wall of the shell, and a gas liquid flows between the refrigerant liquid outlet and the refrigerant gas outlet and hits the bottom surface of the shell and flows along the bottom surface of the shell on the side opposite to the gas liquid mixing inlet. This condenser for a refrigerator is characterized in that a return plate is connected and arranged to cause the mixed fluid to collide and deflect from the direction of the refrigerant gas outlet.

[Effect]

The present invention has the above-mentioned configuration, whereby droplets scattered toward the refrigerant gas outlet with the flash refrigerant gas flowing in from the gas-liquid mixed refrigerant inlet are captured by the downward biasing plate and the return plate, It is possible to reliably separate the gas from the gas and allow only the gas to be sucked into the high-pressure stage compressor, thereby preventing problems with the compressor caused by suction of droplets.Moreover, these droplet trapping members can be used in the deployment of cooling water pipes. Since it is provided without much influence, there is no need to particularly increase the size of the shell, and the device can be made more compact.

Note that if these droplet trapping members are provided below the center of the shell, even if droplets are splashed off from the member, they are away from the refrigerant gas outlet at the top of the shell, and suction can be prevented.

〔Example〕

Embodiments of the present invention will be described using the drawings.

In Fig. 1, 1 is an evaporator, 2 is a low-pressure stage compressor, 3 is a low-pressure stage condenser (intermediate pressure condenser), and 4 is a low-pressure stage condenser.
5 is a high-pressure stage compressor, and 5 is a high-pressure stage condenser, which constitute a refrigerator that performs a refrigeration cycle by circulating refrigerant.

The operation mode is a single-stage refrigeration cycle operation in which the compressor 4 and condenser 5 are stopped and the condenser 3 performs a condensing action to circulate the refrigerant, and all equipment is used.
The condenser 3 can be operated in series in which the refrigerant is circulated by performing an economizer action, and the two operation modes can be switched by changing the refrigerant path.

As shown in FIG. 2, the condenser 3 includes an inlet 6 for refrigerant gas discharged from the low-pressure stage compressor 2;
An inlet 7 for the flashed gas-liquid mixed refrigerant returned from the condenser 5, a refrigerant gas outlet 8 for sucking out the discharged refrigerant gas and the flash gas and guiding it to the high-pressure stage compressor 4, and a refrigerant liquid leading the condensed refrigerant liquid to the evaporator 1. It has an outlet 9.

The condenser 3 part has a gas-liquid mixed refrigerant flow direction that prevents the flow of the gas-liquid mixed refrigerant from the gas-liquid mixed refrigerant inlet 7 to the refrigerant gas outlet 8, captures droplets, and directs the gas-liquid mixed refrigerant flow in a direction away from the refrigerant gas outlet 8. A downward biasing plate 10 and a return plate 11 are provided as droplet trapping members for changing the flow, and a perforated plate 12 is provided as a protruding member that serves as a flow dispersion plate and a droplet trapping member.

The downward biasing plate 10 has a shape that captures droplets of the gas-liquid mixed refrigerant flowing in from the gas-liquid mixed refrigerant inlet 7 and immediately deflects the direction of the flow largely downward, and is opposed to the gas-liquid mixed refrigerant inlet 7. It is provided.

The return plate 11 changes the direction of the flow of flash gas flowing along the inner circumferential surface of the shell or the flow direction of the collected refrigerant liquid, generated by the downward biasing plate 10, toward the center of the shell. It is provided substantially parallel to and protrudes from the shell inner wall in a substantially radial direction.

The downward biasing plate 10 is provided at its lower end with a perforated plate 12 for causing the flash gas to flow from a wide range in the longitudinal direction of the shell to the center of the shell.

Although the gas-liquid mixed refrigerant inlet 7 is provided to open lower than the center of the shell, it may be opened higher.

The refrigerant gas inlet 6 is opened near the gas-liquid mixed refrigerant inlet 7 on the upstream side of the perforated plate 12 so that the high temperature refrigerant gas from the compressor 2 can be cooled by droplets mixed with the flash gas. In this example, the downward biasing plate 10 and the perforated plate 12 are
An opening is provided in a space 13 formed by the shell wall and the shell wall.

Note that the downward biasing plate 10, the perforated plate 12, and the return plate 11 may be provided over the entire longitudinal direction of the shell, or may be provided in a portion near the gas-liquid mixed refrigerant inlet 7.

In addition, a gas-liquid mixed refrigerant inlet 7 and a refrigerant gas outlet 8
It is effective for droplet separation and gas cooling to provide them at intervals in the longitudinal direction of the shell.

Therefore, from the gas-liquid mixed refrigerant inlet 7 to the condenser 3
Immediately after the gas-liquid mixed refrigerant flows into the shell, the flow direction is changed downward by the downward biasing plate 10 and flows along the bottom surface of the shell, and after being dispersed in the longitudinal direction of the shell by the perforated plate 12, Flows circumferentially around the bottom of the shell from a wide range. Finally, the direction is changed to the center of the shell by the return plate 11, and then it reaches the refrigerant gas outlet 8, but the droplets mixed with the flash gas first pass through the downward biasing plate 11.
It adheres to the perforated plate 12 and is separated. As the droplets that have not adhered to each other flow through the condenser 3 as described above, they are removed from the refrigerant liquid accumulated in the shell and the return plate 1.
1. The cooling water pipe in the shell adheres to the shell wall and is separated from the gas, and only the gas is sucked into the compressor 4 from the refrigerant gas outlet 8.

In addition, while the high temperature refrigerant gas flowing in from the refrigerant gas inlet 6 flows through the condenser 3 together with the gas-liquid mixed refrigerant, it is mixed with the cooling water pipe and low-temperature flash gas and is cooled, as well as being cooled by the latent heat of the droplets. Since it is cooled even when it is cooled, it is further cooled.

Therefore, the bearing temperature of the high-pressure stage compressor 4 does not increase and vibrations are not caused. Furthermore, it is possible to improve the refrigeration efficiency.

In this way, in the embodiment described above, the condenser 3 can effectively perform both the droplet separation function and the cooling function of the superheated refrigerant gas discharged from the compressor 2.

FIG. 3 shows another embodiment, in which as a droplet trapping member,
Furthermore, a tube support plate 14 is used.

The refrigerant gas inlet 6 and the gas-liquid mixed refrigerant inlet 7 are opened in the same span, and at least one, preferably a plurality of tube support plates 1 are provided between the refrigerant gas inlet 6 and the gas-liquid mixed refrigerant inlet 7 and the refrigerant gas outlet 8.
4 will be intervening.

In this example, droplet separation is performed more efficiently.

Although the embodiments described above are applied to a refrigerator equipped with two single-stage compressors, the present invention can also be applied to a refrigerator equipped with a plurality of single-stage compressors. Furthermore, the present invention is not limited to two stages, but can be applied to three or more stages.

〔Effect of the invention〕

According to the present invention, it is possible to provide a refrigerator condenser that can accurately separate droplets, thereby eliminating problems with the compressor caused by suction of droplets, and further making the condenser compact, resulting in significant practical effects. can be played.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a flow diagram of a state of use, FIG. 2 is a sectional side view, and FIG. 3 is a sectional plan view of another embodiment. 1... Evaporator, 2... Compressor, 3... Condenser,
4... Compressor, 5... Condenser, 6... Refrigerant gas inlet, 7... Gas-liquid mixed refrigerant inlet, 8... Refrigerant gas outlet, 9... Refrigerant liquid outlet, 10... Downward biasing plate ,
11... return plate, 12... porous plate, 13... space, 14... tube support plate.

Claims (1)

[Claims] 1. A condenser for a refrigerator having compressors 2 and 4 with multiple pressure stages, condensers 3 and 5 with multiple pressure stages, and an evaporator 1, which has a refrigerant gas outlet 8 in the upper part, In addition, in the intermediate pressure condenser 3 which has a refrigerant liquid outlet 9 in the lower part and also functions as an economizer by switching the operation mode, the flashed gas-liquid mixture is returned to the intermediate pressure condenser 3 from the high pressure stage condenser 5. A refrigerant gas-liquid mixed refrigerant inlet 7 is provided between the refrigerant gas outlet 8 and the refrigerant liquid outlet 9, and a gas-liquid mixed refrigerant inlet 7 is provided opposite to the vicinity of the gas-liquid mixed refrigerant inlet 7 to reflect the flow of the gas-liquid mixed refrigerant downward. A downward biasing plate 10 is connected to the inner wall of the shell and is provided between the refrigerant liquid outlet 9 and the refrigerant gas outlet 8 on the inner wall of the shell opposite to the gas liquid mixing inlet 7. A condenser for a refrigerator, characterized in that a return plate 11 is connected and arranged to cause the gas-liquid mixed fluid flowing along the flow to collide with each other and deflect it from the direction of the refrigerant gas outlet. 2. The condenser according to claim 1, wherein the gas-liquid mixed refrigerant inlet, the downward biasing plate, and the return plate are located below the center of the shell.