JPH021517Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an oil-fed compressor used, for example, in a refrigerator.

(Prior Art) Conventionally, as this type of compressor, the one shown in FIG. 2 is known. That is, in the figure, 1 is an oil-cooled compressor main body (hereinafter referred to as main body), and on the discharge side there is an oil recovery section 4a on the upstream side in the same container.
and a filter section 5a on the downstream side.
a is placed. Also, a pipe line from the outlet side of the filter section 5a to a compressed gas consumption point (not shown) via a check valve 7a, and a pipe equipped with a pressure relief valve 10 that branches off at an intermediate point between the check valve 7a and the filter section 5a. A pressure relief valve 10 is opened and closed by a pressure switch 9 provided downstream of the check valve 7a.

Further, a first oil circulation pipe line from the bottom of the oil recovery section 4a of the oil separator 3a to the lubricating section of the main body 1 via the oil cooler 11 and the oil filter 12, the filter inlet side of the filter section 5a and the filter The main body 1 is inserted through the orifice 13 from the bottom of each outlet side.
An oil circulation conduit leading to the suction side is formed.
Note that 2 is an intake filter, and 6 is a mist filter.

In the compressor configured in this way, the gas sucked into the main body 1 through the intake filter 2 is
It is discharged to the oil recovery section 4a of the oil separator 3a together with the lubricating oil from the circulation pipe and the second oil circulation pipe. Here, the compressed gas separated from the oil is filtered through the filter section 5.
The oil mist is removed by the mist filter 6 of a.
It passes through the check valve 7a and is sent to a compressed gas consumption location (not shown). Furthermore, the lubricating oil separated and recovered in the oil recovery section 4a passes through the first oil circulation pipe to the main body 1.
The lubricating oil from the inlet side and the compressed gas from the outlet side of the filter part 5a are supplied to the lubricating part of the filter part 5a.
They are mixed through the orifice 13 to form a gas-liquid mixed fluid with an appropriate concentration, which is circulated and used through the second oil circulation pipe.

By the way, from the viewpoint of energy saving, the above compressor is equipped with a pressure relief valve 1 according to an increase or decrease in the amount of compressed gas consumed.
0 is opened and closed.

That is, when the supply becomes excessive with respect to the consumption of compressed gas, the pressure on the discharge side of the main body 1 rises, and the upper limit pressure is detected by the pressure switch 9, the pressure relief valve 1
0 is opened, and the compressed gas between the main body 1 and the check valve 7a is released to the atmosphere (no-load state).

In this way, by storing the compressed gas once supplied to the downstream side of the check valve 7a, the release of energy is kept to a minimum and the load upon starting the main body is reduced.

Next, the pressure on the downstream side of the check valve 7a decreases as the consumption of compressed gas increases, and when the lower limit pressure is detected by the pressure switch 9, the pressure relief valve 10 is closed (loaded state).

(Problems to be Solved by the Invention) However, in this compressor, the volume from the oil separator 3a, especially from the filter section 5a to the check valve 7a, is large, so when switching from the loaded state to the no-load state, the oil There is a large energy loss due to the compressed gas stored in the separator 3a being released into the atmosphere.

On the other hand, when switching to the loaded state, the oil separator 3a is again filled with pressure, so there is a large time delay until the compressed gas is pumped through the check valve 7a.

Furthermore, during the pressurization, the gas flow rate passing through the mist filter 6 increases and the oil mist collection performance decreases, resulting in disadvantages such as an increase in oil consumption.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional compressor, it is an object of the present invention to provide a compressor with less energy loss and less time delay.

(Means for Solving the Problems) In order to solve the above problems, the oil-cooled compressor according to the present invention has a non-return check that is provided in the compressor body and on the discharge side thereof, and in the same container. an oil separator formed by adjoining an oil recovery section and a filter section through a partition wall provided with a valve; a pressure relief valve provided in the oil recovery section;
It consists of an oil circulation pipe installed between the oil separator and the low pressure side of the compressor main body.

(Example) Next, an example of the present invention will be described with reference to the drawings.

Figure 1 shows an oil-cooled compressor according to the present invention, with a second
The compressor shown in the figure is substantially the same except for the mounting positions of the check valve 7 and the pressure relief valve 10, and corresponding parts are given the same numbers and explanations will be omitted.

In this compressor, as shown in FIG.
is provided on the partition wall 14 that partitions the oil recovery section 4 and the filter section 5 of the oil separator 3 consisting of a single container, and prevents the compressed gas from flowing back from the filter section 5 to the oil recovery section 4. There is. Moreover, the pressure relief valve 10 is
It is provided upstream of the check valve 7, that is, in communication with the oil recovery section 4.

In the compressor configured in this way, the actions of each part of the device when the consumption of compressed gas is large are as follows.
This is substantially the same as the case of the compressor shown in the figure.

On the other hand, when the consumption of compressed gas decreases and shifts to a no-load state, the pressure relief valve 10 is opened, and only the compressed gas in the space from the main body 1 to the oil recovery section 4 is released into the atmosphere, and the filter section 5 Subsequent compressed gas is retained without being released into the atmosphere.

When the consumption of compressed gas increases and the pressure switch 9 detects the lower limit pressure, the pressure relief valve 10 is closed and the compressed gas is refilled in the relatively small volume area from the main body 1 to the oil recovery section 4. This causes a load condition.

(Effect of the invention) As explained above, according to the invention, the oil recovery section and the filter section of the oil separator are separated by a partition wall equipped with a check valve, and the pressure relief valve is connected to the oil recovery section. Because of this, the volume of compressed gas released into the atmosphere from the pressure relief valve when switching to a no-load state is small, and energy loss is reduced.

Next, when switching to the loaded state, the time delay until the start of pressure feeding is small and the response is quick, so the drop in downstream process side pressure is reduced.

In addition, since the check valve is provided upstream of the mist filter, the compressed gas does not pass through the mist filter during pressurization, which reduces the collection efficiency of the mist filter, unlike conventional methods. No problems will arise.

Furthermore, since the check valve is provided inside the oil separator, it has the effect of reducing noise during operation.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an oil-fed compressor according to the present invention, and FIG. 2 is a system diagram of a conventional oil-fed compressor. DESCRIPTION OF SYMBOLS 1... Compressor main body, 3... Oil separator, 4... Oil recovery part, 5... Filter part, 6... Mist filter, 7...
Check valve, 10...Pressure relief valve.

Claims (1)

[Scope of utility model registration request] A compressor main body, an oil separator provided on the discharge side of the compressor, and formed with an oil recovery section and a filter section adjacent to each other through a partition wall equipped with a check valve in the same container, and an oil recovery section. An oil-cooled compressor characterized by comprising: a pressure relief valve provided in the compressor, and an oil circulation pipe provided between the oil separator and the low-pressure side of the compressor main body.