JPH09272902A - Device for impregnating porous member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which is capable of continuously impregnating porous members with a liquid substance in a short time. SOLUTION: A device 40 for carrying the porous member and a liquid current generating means 22 for making liquid current pressure act on the moving porous member 50 are installed under a liquid surface in an impregnating tank 10 storing an impregnating liquid and, further, a deaeration tank 30 covering the liquid surface to which air (air bubble) coming from holes bleats is provided and the inside thereof is evacuated. In such a manner, positive pressure acts on one side of the porous member and negative pressure acts on another side thereof and thereby deaeration and impregnation can be done in a shorter time than heretofore and the treated porous members are continuously carried out by the carrying device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impregnating device for impregnating a pore of a porous member represented by a sintered part with a liquid such as lubricating oil or liquid resin.

Sintered parts impregnated with lubricating oil include, for example, sintered oil-impregnated bearings. On the other hand, when a sintered member is to be made airtight, a pore is filled with a liquid synthetic resin to solidify it. Processing is performed. Since there is basically no difference in the impregnation device in either case, the impregnation of oil will be mainly described below.

[0003]

2. Description of the Related Art There are two methods for impregnating oil: a normal pressure immersion method and a vacuum method. In the former case, the oil in the oil tank is heated to 80 to 100 ° C., and the porous member therein is heated at normal pressure for about 30 minutes to
The latter is a method of immersing for 1 hour. In the latter, the porous member is placed in a closed container, the container is depressurized and the pores are degassed, and then immersed in oil, then returned to normal pressure and pressed under atmospheric pressure. Is the way. The time required for the latter depends on the capacity, but is usually 10
~ 15 minutes.

Regarding the advantages and disadvantages of these two methods, the atmospheric dipping method is easy to carry out because no special equipment is required, but since the oil is heated to a high temperature to facilitate impregnation, there is a risk of deterioration. is there. The vacuum method requires equipment such as a vacuum tank and a vacuum pump, and is not efficient because it is a batch process. However, the oil method has a different vacuum impregnation due to the difference in the degree of impregnation of blind holes. Is said to be about 10% higher.

[0005]

As described above, the vacuum method requires batch processing because it requires batch processing, and is not suitable for mass production. On the other hand, in the atmospheric dipping method, deterioration of oil due to high temperature heating is problematic. To prevent this, if the treatment is carried out at room temperature to medium temperature, the time required for impregnation becomes extremely long. Under such circumstances, there has been a demand for an efficient impregnation method and an impregnation apparatus capable of performing continuous impregnation treatment and shortening the treatment time.

[0006]

In the conventional atmospheric pressure dipping method, the impregnating liquid is in a stationary state, whereas in the present invention, a liquid flow is generated in the impregnating liquid to spray it on the porous member. The impregnation device is configured so that the pressure promotes the escape of the air in the pores, while the air (air bubbles) emerging from the pores is sucked and removed by the degassing tank and the exhaust device provided above the impregnation tank. did.

In the present invention, an impregnating tank, which stores the impregnating liquid therein and is open to the atmosphere, is used, and the porous member to be impregnated is put into and out of the impregnating tank from the outside of the impregnating tank, Carried by a carrier that goes under the liquid surface of
It is immersed in the impregnating liquid. Here, an endless mesh belt type is suitable as the conveying device, but the conveying device is not limited to this, and a hanging type or any other suitable device can be used.

The liquid flow generating means for the impregnating liquid is mounted close to the transfer device at a position suitable for spraying the liquid flow onto the porous member. On the other hand, a bottomless degassing tank equipped with an evacuation device such as a vacuum pump is provided so as to cover the liquid surface on which air bubbles float, and removes air bubbles from the impregnating liquid by depressurizing the inside of the tank. As a result, the porous member tends to have a positive pressure on the liquid flow generating means side and a negative pressure on the opposite side, and as a result, impregnation progresses in a shorter time than before.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) In FIG. 1, reference numeral 40 denotes an endless mesh belt type transporting device, in which a porous member 50 placed on a belt enters the impregnation tank 10 from one end thereof and dives in the impregnating liquid 11. It reaches the other end and goes out of the tank. The impregnation tank is provided with a circulation system (20) for the impregnation liquid. This circulation system is composed of a discharge port 23 from the tank, a pump 21, an injection nozzle 22 into the tank, and a pipe line. The injection nozzle 22 is arranged along the belt so as to blow up the impregnating liquid onto the porous member on the belt. It is arranged in the position directly below.

Above the area where the injection nozzle 22 is arranged, a bottomless deaeration tank 30 is provided with its lower end submerged in the impregnating liquid, and air coming out from the pores of the porous member ( The exhaust device 31 sucks and removes bubbles.

While passing over the jet nozzle 22, the porous member receives a wave-like pressure from the liquid flow blown up, and combined with the suction action of the degassing tank 30 whose pressure is reduced, deaeration from the holes is performed. Be promoted. Therefore, impregnation into the pores is promoted accordingly. When a comparison test with the atmospheric pressure immersion method was performed using oils heated to 40 ° C. respectively, the impregnation rate was 8
The processing time to reach 0% was shortened to about half of that in the atmospheric pressure dipping method by the apparatus of the present invention.

(Embodiment 2) In the above example, the injection nozzle 2
The liquid flow generated in 2 is applied to the porous member from below, but in this example, the position of the injection nozzle 22 is changed laterally with respect to the traveling direction of the belt, and the liquid flow is changed to the porous member. It is configured to work from the side.

In FIG. 2, members having the same or equivalent functions as those in FIG. 1 are designated by the same reference numerals as in FIG. In the case of FIG. 2, the transport device (belt) 40 advances from the upper side of the paper surface to the rear surface. The liquid flow generated from the injection nozzle 22 located on the side of the belt acts on the porous member from the right side thereof, and then flows to the left by enclosing the bubbles coming out of the pores of the porous member, to the wall of the impregnation tank. Rises along.

A deaeration tank 30 and an exhaust device 3 are provided on the upper part of the tank.
1, the impregnating liquid from which air bubbles have been removed flows back to the pump 21 via a discharge port and a conduit (not shown). By the way, in the case of the figure, the liquid flow was made to act on the porous member from the horizontal direction, but when the porous members are arranged in multiple rows on the belt, it is more effective to make the liquid flow act obliquely. is there.

(Embodiment 3) The apparatus shown in FIG. 3 has the same overall structure as that of FIG.
The difference is that a screw 61 operated by a motor 62 is attached instead of. In this device, the discharge port 23,
The pump 21 and the pipeline are unnecessary, and the impregnating liquid circulates inside the impregnation tank. The effects of degassing and impregnation are almost the same as those of FIG.

[0016]

As described above in detail, according to the impregnating apparatus of the present invention, the impregnation rate close to the vacuum method can be achieved in a relatively short time. Moreover, since the impregnation treatment is a continuous method, the production efficiency is significantly improved. Thus, the impregnating apparatus according to the present invention has the advantages of both the conventional vacuum method and atmospheric pressure immersion method.

[Brief description of drawings]

FIG. 1 is a drawing for explaining an embodiment of an impregnating device according to the present invention.

FIG. 2 is a drawing explaining another embodiment of the impregnating device according to the present invention.

FIG. 3 is a drawing for explaining another embodiment of the impregnating device according to the present invention.

[Explanation of symbols]

 10 ... Impregnation tank, 11 ... Impregnation liquid 20 ... Impregnation liquid circulation system 21 ... Pump, 22 ... Injection nozzle, 23 ... Discharge port 30 ... Degassing tank, 31 ... Exhaust device 40 ... Transport device, 50 ... Porous member (covered) Processing parts) 60 ... Stirrer, 61 ... Screw, 62 ... Motor

Claims (4)

[Claims] 1. A device for impregnating a liquid substance into the pores of a porous member, which conveys the porous member under the liquid surface of an impregnation tank storing the impregnating liquid, and a liquid surface. A liquid flow generating means for applying a pressure of a liquid flow to a porous member moving below, and a degassing tank for covering the liquid surface on which the bubbles emerging from the holes float. Impregnation device for porous materials. 2. The impregnating apparatus for a porous member according to claim 1, wherein the liquid flow generating means is provided below the porous member. 3. The impregnating device for a porous member according to claim 1, wherein the liquid flow generating means is provided on a side surface of the porous member. 4. The conveying device according to claim 1, wherein the conveying device is an endless mesh belt type conveyor.
6. The impregnating device for a porous member according to.