JPH0540307Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a compressor mainly used for vehicle air conditioning. It relates to a blind plug attached to an inlet or an outlet.

(Prior art) Generally, when shipping a compressor as a product,
After injecting the necessary amount of oil into the compressor for lubrication, it is common practice to remove air by evacuation and to inject gas such as nitrogen gas in order to prevent oxidation within the compressor. Figure 3 shows an example of a conventional compressor (the figure shows a vane type compressor) when shipped. Lubricating oil is filled in the discharge side chamber 1, and the suction port, which is the connection port with the external circuit, is filled with lubricating oil. Blind plugs 4 are attached to the mouth 2 and the discharge port 3, respectively. This blind plug 4 is a valve equipped with a plunger 6 in the ventilation hole 5 to enable the above-mentioned evacuation and gas injection, and the hose of the work machine is connected to this blind plug 4. In the case of a compressor equipped with a check valve 8 at the suction port 2 to prevent the flow of gas from the suction side chamber 7 to the external circuit side, as shown in the figure, The above-mentioned air venting or gas filling operation is performed using the blind plug 4 on the discharge side, which is the side where the check valve 8 is not installed. Note that the discharge side chamber 1 and the suction side chamber 7 are substantially in communication through the reed valve 9, so that if air is removed and gas is added on the discharge side, the effect also extends to the suction side.

(Problems to be Solved by the Invention) However, when vacuuming is performed using the blind plug 4 on the discharge side, there is a problem in that the oil sealed in the discharge side chamber 1 is sucked out together with the air. This oil suction can be solved by, for example, weakening the suction force, but on the other hand, a new problem arises in that the required time becomes longer. On the other hand, when a compressor is installed in a vehicle after shipping, gas such as nitrogen gas sealed in the compressor must be removed. It cannot be done from the suction side, so it must be done by pushing open the plug 6 of the blind plug 4 on the discharge side, but in that case, the oil in the discharge side chamber 1 will be released together with the gas. I had a problem with it flying out.

Therefore, in view of the above-mentioned conventional problems, the present invention was developed by
The object of the present invention is to provide a blind plug for a compressor that enables evacuation and degassing operations on the discharge side.

(Means for Solving the Problems) The present invention to solve the above problems is intended to be used when shipping compressors equipped with a check valve at the suction port. The gist of the present invention is to provide a spool operating member capable of holding the check valve in an open state when attached to the suction port in the insect plug.

(Function) Therefore, when the blind plug is attached to the intake port of the compressor, the spool operating member provided on the blind plug pushes the spool of the check valve to open the passage and maintain the open state. In this state, the inside of the compressor can be evacuated or gas can be injected using the blind plug on the suction port side. Further, degassing after shipping can be performed by pushing open the blind stopper on the suction side.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. First, the embodiment shown in FIG. 1 will be described. The drawing shows a check valve 8 and a blind plug 4 attached to the suction port 2 of the compressor, which are directly related to the present invention, and there is no particular change in the compressor itself, so illustration of its overall configuration is omitted. are doing. As shown in the figure, the check valve 8 includes a mouthpiece 10 fitted to the suction port 2 and a through hole 11 fitted to the lower side of the mouthpiece 10 to communicate the suction side chamber 7 and the suction port 2. It consists of a cylindrical valve body 12 and a valve spool 14 that is always urged upward by a spring 13 to close the through hole 11 of the valve body 12.

Therefore, the blind plug 4 attached to the suction port 2 when the compressor is shipped has an insect (plunger) inserted into the vent hole 5 to enable evacuation and gas filling.
6, and a spool operating member 15 for opening the check valve 8 is provided on the insertion end side thereof. The spool operating member 15 in this embodiment is a cylindrical body that communicates with the vent hole 5, and pushes down the valve spool 14 of the check valve 8 when the blind stopper 4 is attached to the inlet port 2 to open the valve body 12. It protrudes to an appropriate length to open the through hole 11, and its protruding end is formed obliquely so that the open end is not blocked when it comes into contact with the valve spool 14. In addition, 16 is a cap of the blind stopper 4.

The blind plug 4 of this embodiment is constructed as described above, and therefore, the work of evacuation of the air inside the compressor and filling of gas such as nitrogen gas when shipping the compressor is performed without lubrication as in the conventional case. This can be done by using the blind stopper 4 on the suction side with oil for this purpose put into the discharge chamber 1 shown in FIG. That is, when the blind plug 4 on the suction side is attached, the valve spool 14 of the check valve 8 is pushed down by the spool operating member 15 to open the through hole 11 of the valve body 12, and therefore the suction side chamber is opened. 7,
Since the inlet 2 and the ventilation hole 5 of the blind stopper 4 communicate with each other,
In this state, remove the cap 16 from the blind stopper 4 and connect the hose of the vacuum or gas injector to it via the joint (the insect 6 is pushed open by the connection) to perform the specified work. I can do it.

In addition, when the compressor is mounted on a vehicle after shipment, the gas inside the compressor is vented by removing the cap 16 from the blind stopper 4 and pushing open the insect 6 to release the sealed gas from the suction side. be able to.

Next, the embodiment shown in FIG. 2 will be described. This embodiment differs from the previous embodiment in that the spool operating member 15 protruding from the blind stopper 4 is made of a bar or a plate, and is otherwise constructed in exactly the same manner. The same is true.

Note that as a blind plug for the discharge port in a compressor, a blind plug without a spool operating member as in the past is used, but even if the blind plug 4 with the spool operating member 15 described above is used, there will be no problem. It's not a hindrance.

(Effects of the invention) As described in detail above, according to the invention, in a compressor equipped with a check valve on the suction side, air removal and gas filling operations in the compressor are carried out at the time of shipment, and after shipment, the Since the degassing work that is performed when installing the pump can be performed on the suction side, it solves the problem that the oil sealed in the discharge side chamber is sucked out by vacuuming or blown out together with gas and reduced. be able to.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 3 is a longitudinal sectional view showing a conventional blind plug installed in a vane compressor. 1...Discharge side chamber, 2...Suction port, 3...
Discharge port, 4... Blind plug, 6... Insect, 7... Suction side chamber, 8... Check valve, 12... Valve body, 14...
...Valve spool, 15...Spool operating member.

Claims (1)

[Scope of utility model registration request] A blind stopper with an insect that is attached to the suction port of a compressor equipped with a check valve to enable operations such as air removal and gas injection into the compressor, and the check valve is opened when the plug is attached to the suction port. A blind plug for a compressor equipped with a spool operating member that can be maintained in a state.