JPH06341392A - Oil-cooled rotary compressor - Google Patents

Abstract

PURPOSE:To provide an oil-cooled rotary compressor which can reduce the pressure loss of a fluid in a radiator without dropping its heat dispersion ability. CONSTITUTION:An oil-cooled type screw compressor is equipped with an after- cooler 1 and oil cooler 16 as one sort of drawn cup type air-cooled radiator, wherein a gas flow speed adjusting plate 2 is installed in proximity to the after-cooler 1 so as to narrow the flow path for the cooling gas, for example air, which passes through the after-cooler 1 and takes off the heat from the fluid in the after-cooler 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-cooled rotary compressor equipped with a drone cup type air-cooled radiator.

[0002]

2. Description of the Related Art Conventionally, a package type oil-cooled rotary compressor shown in FIG. 4, for example, a screw compressor is known.
This compressor accommodates a main body portion 14 including a compressor main body, a motor, an oil separation / recovery device, an air tank, etc. in a housing 13 having an inlet 11 and an outlet 12 for cooling gas, usually air. In addition, in order to cool the inside and outside of the main body portion 14, an after cooler 15 and an oil cooler 1 which are a kind of a drone cup type radiator described in detail later.
6 and a sirocco fan 17 which is a kind of intake means. Further, the gas compressed in the compressor body and the oil for cooling the gas compression space portion are sent from the oil cooler 16 into the compressor body by a pipe (not shown), and the temperature is raised as a result of cooling the gas and the like. The oil is returned from the compressor body to the oil cooler 16 for reuse.

Further, the gas compressed by the compressor body is sent to an aftercooler 15 where it is cooled and then supplied to the place where the compressed gas is used through the air tank. As the sirocco fan 17 operates, as shown by the arrow in FIG. 4, the cooling gas flows in from the inflow port 11, and the main body portion 14, the aftercooler 15,
It flows through the oil cooler 16 to the outlet 12, and the main body 1
4, the after cooler 15 and the oil cooler 16 are cooled. By cooling the aftercooler 15 and the oil cooler 16 in this way, the compressed gas and the oil are cooled as described above.

By the way, the aftercooler 15 and the oil cooler 16 which are types of drone cup type heat exchangers are shown in FIG.
As shown in FIGS. 8 to 8, a plurality of plates 18 formed by using the same mold are joined together. As described above, when the mold is used for manufacturing, the initial cost (mainly the mold cost) is high, but when the number of manufactured units is large, the product unit price can be reduced. For this reason,
The motor output of the compressor drive unit is, for example, 11 kw to 37
Up to kw (Example: 11kw, 15kw, 22kw, 37k
It is desirable to increase the number of products using this plate by adopting the plate formed by using the same mold for w) and aftercooler and oil cooler of as many different models as possible.

On the other hand, aftercooler 15 and oil cooler 16
Basically, the heat dissipation capacity required for the increase becomes proportional to the motor output (kw). Since the A and B dimensions of the plate 18 shown in FIG. 6 are determined by the dimensions of the mold used, the number of the plates 18 of the aftercooler 15 and the oil cooler 16 is determined according to the model in which these are incorporated. . Therefore, as shown in FIG. 5, the height H _{1A / C} of the aftercooler 15 and the height H _{1O / C} of the oil cooler 16 for obtaining the required heat dissipation amount are determined from the motor output.

[0006]

Among the aftercooler 15 and the oil cooler 16 of the conventional compressor described above, for example, the aftercooler 15 will be described as an example. The height H _{1A / C} determined as described above will be described. Then, the pressure loss of the compressed gas in the aftercooler 15 may become too large. On the other hand, as shown in FIG. 8, it is possible to reduce the pressure loss by increasing the number of plates 18 and increasing the height of the aftercooler 15 to H _{1A / C} + H _{2O / C.} However, since the flow velocity of the cooling gas passing through the aftercooler 15 (this height is H) is inversely proportional to A × H, that is, the area, A is constant and H is H _{1A / C} + H _{2 O / C.} As the flow velocity increases, the flow velocity decreases. As a result, the amount of heat dissipated in the aftercooler 15 also decreases, and the temperature of the compressed gas sent out of the machine rises.

The same applies to the oil cooler 16, and if the height is increased in order to reduce the pressure loss in the oil cooler 16, the oil cooling in the oil cooler 16 becomes insufficient, resulting in compression. There is a problem that the temperature of the space rises and the discharge gas temperature rises. The present invention has been made to solve the conventional problems, and an oil-cooled rotary compressor capable of reducing pressure loss of fluid in the radiator without lowering the heat dissipation capacity of the radiator. It is the one we are trying to provide.

[0008]

In order to solve the above-mentioned problems, the present invention provides an oil-cooled rotary compressor equipped with a drone cup type air-cooled radiator, which passes through the radiator to remove the fluid from the radiator. A gas flow rate adjusting plate that narrows the flow path of the cooling gas that removes heat is provided on the radiator or in the vicinity of the radiator.

[0009]

With the above-mentioned structure, even if the radiator height is increased to reduce the pressure loss of the fluid inside, the flow passage cross-sectional area of the cooling gas passing through this radiator is reduced. become able to.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an oil-cooled screw compressor according to the present invention, and the compressor shown in FIG.
5 is substantially the same except that an aftercooler 1 having a larger height is provided and a gas flow rate adjusting plate 2 is provided, and parts corresponding to each other are designated by the same reference numerals. The description is omitted. FIG. 2 shows the compressor body 3
Shows the connection relationship between the aftercooler 1 and the oil cooler 16, and an oil separation / collector 5 and an aftercooler 1 forming a part of the discharge flow path 4 are provided on the discharge side of the compressor body 3. The lower part of the oil separation / recovery device 5 is an oil sump portion 6, from which oil is supplied via an oil cooler 16 to a bearing in the compressor body 3, a shaft sealing portion, and an oil injection point such as a gas compression space. A channel 7 is provided.

The gas compressed while being injected in the compressor body 3 is discharged together with the oil, and is separated into gas and liquid by the oil separation / recovery device 5, and the oil is dripped into the oil sump portion 6 once. The compressed gas that has been stored and separated into oil is cooled by the aftercooler 1 and sent to the right in FIG. On the other hand, the oil in the oil sump portion 6 is cooled by the oil cooler 16 and sent to the above-mentioned oil-filling portion, and thereafter circulated and used in the same manner as above.

Further, in this embodiment, the number of plates 18 is increased and the aftercooler 1 is enlarged,
The pressure loss of the compressed gas inside is reduced, and the gas flow velocity adjusting plate 2 narrows the flow passage cross-sectional area of the cooling gas, for example, air, and prevents the flow velocity of the air passing through the aftercooler 1 from decreasing. For this reason, the pressure loss is reduced without reducing the heat dissipation capability of the aftercooler 1. As shown by the chain double-dashed line in FIG. 3, a bypass passage 8 may be provided between the inlet-side pipe and the outlet-side pipe of the aftercooler 1 to move toward the aftercooler 1. The pressure loss of the compressed gas that exits here can be further reduced.

In the above embodiment, the gas flow rate adjusting plate 2 is provided only in the aftercooler 1, but the same applies to the oil cooler 16 as well, and the gas flow rate adjusting plate is similarly provided. It goes without saying that it is good. The gas flow rate adjusting plate may be provided directly on the aftercooler 1 or the oil cooler 16 or may be provided in close proximity thereto.
Further, the present invention is not limited to the screw compressor, but is applied to all oil-cooled rotary compressors.

[0014]

As is apparent from the above description, according to the present invention, in the oil-cooled rotary compressor provided with the drone cup type air-cooled radiator, heat is passed from the fluid inside the radiator after passing through the radiator. A gas flow rate adjusting plate that narrows the flow path of the cooling gas that takes away the gas is formed on the radiator or in the vicinity of the radiator.
For this reason, even if the height of the radiator is increased to reduce the pressure loss of the fluid inside, it becomes possible to reduce the flow passage cross-sectional area of the cooling gas passing through this radiator, and the heat dissipation capability of the radiator. It is possible to reduce the pressure loss without decreasing the pressure drop.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a package type oil-cooled screw compressor according to the present invention.

FIG. 2 is a diagram showing a connection relationship between a compressor body of the compressor shown in FIG. 1, an aftercooler, and an oil cooler.

3 is a front view of an aftercooler and an oil cooler of the compressor shown in FIG.

FIG. 4 is a sectional view showing an outline of a conventional package type oil-cooled screw compressor.

5 is a front view of an aftercooler and an oil cooler of the compressor shown in FIG.

6 is a plan view of plates constituting an aftercooler and an oil cooler of the compressor shown in FIG.

7 is a sectional view taken along line VII-VII of FIG.

8 is a cross-sectional view showing a state in which a plurality of plates shown in FIG. 6 are joined together.

9 is a front view showing a state in which the height of the aftercooler of the aftercooler and the oil cooler shown in FIG. 5 is increased.

[Explanation of symbols]

 1 After cooler 2 Gas flow rate control plate 16 Oil cooler 18 plate

Claims (1)

[Claims] 1. An oil-cooled rotary compressor provided with a drone cup type air-cooled radiator, wherein a gas flow rate control plate for narrowing a flow path of a cooling gas that passes through the radiator and removes heat from a fluid in the radiator. An oil-cooled rotary compressor, characterized in that it is provided on the radiator or close to the radiator.