JPH0628172Y2 - Dehumidifier - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a dehumidifier installed in a pneumatic circuit, and more specifically, to an air compressor installed between an air compressor and a source air reservoir. The present invention relates to a dehumidifying device that removes water, oil, and the like contained in compressed air from a machine.

[Conventional technology]

As is well known, pneumatic equipment in railway vehicles and the like operates by compressed air from an air compressor. However, since the compressed air contains foreign matters such as water and oil, Need to be removed beforehand. Therefore, it is customary to provide a dehumidifier between the air compressor and the original air reservoir in this type of pneumatic circuit. As a specific example of this dehumidifier, for example, Japanese Utility Model Laid-Open No. 56-28733. There are disclosures.

As shown in FIG. 13, this one has an inflow port 2, an outflow port 3 and a drain discharge port 4 on one side of a main body 1, and the inflow port 2 is connected to an air compressor 5, The outlet 3 is connected to the regeneration air reservoir 6, and the drain outlet 4 is connected to the discharge valve 7. The regenerated air reservoir 6 is the original air reservoir 8
Is connected to a pneumatic device such as an air brake device, and the discharge valve 7 connects or shuts off the drain discharge port 4 to the atmosphere in conjunction with the operation of the air compressor 5. On the other hand, inside the main body 1, there is provided a cylindrical chamber 10 defined by an inner cylinder 9 having an opening at the bottom, and the cylindrical chamber 10 has a cylindrical shape in which adsorbent particles are porous. An adsorbent 11 formed and fixed to the adsorbent 11, a band-shaped filter 12 wound around the outer peripheral surface of the adsorbent 11, a gasket 13 attached to the band-shaped filter 12 and the upper end and the lower end of the adsorbent 11. 14 are housed, and each of these components is supported by a holding plate 16 fixed to the main body 1 using bolts 15.

When the air compressor 5 is operated, the compressed air flows into the main body 1 through the inflow port 2, passes through the path indicated by the arrow, and flows from the exhaust port 3 to the regenerated air reservoir 6 and the original air reservoir 8. Delivery pressure is accumulated. Specifically, the compressed air that has flowed in from the inflow port 2 flows through the outer peripheral passage 17 of the inner cylinder 9 into the inner peripheral space of the inner cylinder 9, that is, the outer peripheral space 18 of the band-shaped filter 12, and then The oil content is removed by passing through the band-shaped filter 12, and the water content is removed by passing through the adsorbent 11, so that dry compressed air is obtained. The dried compressed air passes through the inner hole 19 and the through holes 20, 20 of the adsorbent 11 to move the check valve 21 upward, and then the discharge passage 2
It reaches the outlet 3 via 2.

Next, when the operation of the air compressor 5 is stopped, the discharge valve 7 is opened and the drain discharge port 4 is communicated with the atmosphere by the switch operation accompanying this, so that the inside of the regeneration air reservoir 6 is The compressed air flows back into the exhaust passage 22, and expands by passing through the throttle 23 little by little to become air that is even drier than before. Then, the dried air passes through the adsorbent 11 in the opposite direction to absorb water from the adsorbent 11 and reach the drain outlet 4, and as a result, the adsorbent 11 is regenerated.

By the way, since the above dehumidifying device is one in which the band-shaped filter 12 is closely wound around the outer peripheral surface of the adsorbent 11,
If the amount of oil that adheres to and accumulates on the band-shaped filter 12 becomes excessive, the band-shaped filter will be used when compressed air is supplied (during dehumidification).
The pressure difference between the inner peripheral side and the outer peripheral side of 12 increases, and this pressure difference causes oil to infiltrate into the adsorbent 11 and reduces its performance, and at the time of discharging compressed air (during regeneration). The band-shaped filter 12 serves as a barrier, which causes a problem that the oil inside the adsorbent 11 cannot be discharged to the outside.

Therefore, in order to avoid such a problem, as shown in FIG. 14, by forming a gap 24 between the outer peripheral surface of the adsorbent 11 and the band-shaped filter 12, the oil of the band-shaped filter 12 can be absorbed. Techniques such as preventing direct invasion of water have come into practical use. The band-shaped filter 12
12x thin through hole forming tube with many through holes on the inner circumference
Are fitted (see Fig. 15), and the inner hole of the adsorbent 11
A net-like tube 19x that receives debris due to the collapse of the shape of the adsorbent 11 is loosely inserted in 19 (see FIG. 14).

[Problems to be solved by the device]

However, as described above, the adsorbent 11 and the band-shaped filter are used.
Even if the method of forming the gap 24 between 12 and 15
As shown in the figure, when the compressed air A is supplied, the oil B adhering to the band-shaped filter 12 flows down along the inner peripheral surface thereof as indicated by the arrow, and the lower end of the gap 24 is closed. An oil sump X is generated inward of the contact point between the gasket 14 on the side of the section and the gasket 12a on the side of the lower end of the band-shaped filter 12, and this sump X also discharges the compressed air A'shown in FIG. Even at times, it remains in the area concerned. When the oil sump X is generated and remains in this way, when the compressed air A is supplied, the oil will infiltrate into the adsorbent 11 from the oil sump X, and this causes the adsorbent 11 to enter. Causes the problem that the performance of the is decreasing from the bottom.

In view of this point, the present invention avoids a situation in which the oil B that has flowed down along the inner peripheral surface of the band-shaped filter 12 remains at the lower end portion of the gap 24 and forms the oil sump X, and thus the adsorbent
It was made as a technical subject to extend the life of 11.

[Means for Solving the Problems]

As a specific means for achieving the above technical problem, the main body is provided with a tubular chamber communicating with each of the inlet, the outlet, and the drain outlet, and the adsorbent particles are provided in the tubular chamber. The adsorbent, which is cylindrically fixed in a cylindrical shape, is provided with a band-shaped filter wound around the outer peripheral surface of the adsorbent, and elastic gaskets attached to the upper end and the lower end of the band-shaped filter, respectively. In the dehumidifying device in which a gap is formed between the filter and the band-shaped filter, and the upper end portion and the lower end portion of this gap are closed by the upper end portion side and the lower end portion side gaskets respectively, in the lower end side gasket, Alternatively, a passage that connects the lower end of the gap and the outer peripheral side space of the band-shaped filter is formed in both of the lower end gasket and the holding plate that supports the gasket from below. A.

[Action]

According to the above means, when compressed air is supplied, that is, during dehumidification, the oil contained in the compressed air adheres to the band-shaped filter.However, when this amount of adhesion increases, the oil is transmitted to the inner peripheral surface of the band-shaped filter. And flows down to reach the lower end of the gap formed between the band-shaped filter and the adsorbent.

In this case, the lower end of the gap is closed by a gasket, but this gasket (or both this gasket and the holding plate supporting it from below)
Since a passage that connects the lower end of the gap and the outer space of the band-shaped filter is formed, when the compressed air is discharged, that is, during regeneration, the oil that has flowed down along the inner surface of the band-shaped filter is compressed air. Is discharged to the space on the outer peripheral side of the band-shaped filter, and then reaches the drain discharge port. Since such an operation is always performed at the time of regeneration, a situation in which an oil sump is formed at the lower end of the gap can be reliably prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 12. The dehumidifying device according to the embodiment described below has the same overall configuration as the conventional example shown in FIG. 13 described above, and therefore description thereof is omitted, and the inside of the cylindrical chamber 10 shown in FIG. 14 described above is omitted. As for the structure, the general structure is the same as that of the conventional one, and therefore its explanation is omitted, and the same components as those of the conventional example shown in FIGS. 15 and 16 are designated by the same reference numerals and the explanation thereof is omitted.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The lower end of the gap 24 formed between the band-shaped filter 12 and the adsorbent 11 is referred to as the band-shaped filter 12 lower end side. Is closed by the gasket 12a attached to the lower end and the gasket 14 on the lower end portion attached to the upper surface of the pressing plate 16, and
A small groove 25 having a small flow passage area is formed in the gasket 14 on the lower end portion side so that the lower end portion of the gap 24 and the outer peripheral side space 18 of the band-shaped filter 12 communicate with each other. And this small groove 25
Are formed at three to five positions on the entire peripheral edge of the upper surface of the gasket 14.

With such a structure, the compressed air A ', which has absorbed moisture by passing through the adsorbent 11 during regeneration, passes through the band-shaped filter 12 and flows out to the outer peripheral side space 18, but at this time, the small groove is formed. Since compressed air A ′ also flows out from 25, the oil B flowing down to the lower end portion of the gap 24 passes through the small groove 25 together with the compressed air A ′ and flows into the outer peripheral side space 18, and after that, , Through the drain outlet and the discharge valve. On the other hand, at the time of dehumidification, the compressed air flows into the outer space 18
From the above, it will pass through the small groove 25 and flow into the inside of the band-shaped filter 12, but since the small groove 25 has a small flow passage area and the pressure difference between the inside and outside of the band-shaped filter 12 is small,
The amount of compressed air flowing through the small groove 25 is extremely small and does not adversely affect the dehumidifying action. 1 and 2, the small groove 25 is formed in the gasket 14 on the lower end side mounted on the upper surface of the pressing plate 16, but instead of this, the lower end of the band-shaped filter 12 is replaced. A small groove may be formed at the lower end edge of the gasket 12a mounted on the section side.

3 and 4 show a second embodiment of the present invention,
The second embodiment differs from the first embodiment in that the small groove 26 having a small flow passage area is formed by bending a vertical groove portion extending in the vertical direction and a horizontal groove portion extending in the horizontal direction. Therefore, also in the second embodiment, the oil B that has flowed down the inner peripheral surface of the band-shaped filter 12 and flows down is passed through the small groove 26 together with the compressed air A'to the outer peripheral side space 18 during regeneration. Become.

5 and 6 show a third embodiment of the present invention.
The third embodiment is the gasket of the second embodiment.
On the inner peripheral side of the opening of the small groove 26 on the upper surface of the upper surface 14, a raised portion 14a is formed so as to protrude upward over the entire circumference. Therefore,
According to the third embodiment, the action of the raised portion 14a prevents the situation where the oil B that has flowed down the inner peripheral surface of the belt-shaped filter 12 and flows downward intrudes inward from the lower end portion of the adsorbent 11. Will be done.

7 and 8 show a fourth embodiment of the present invention.
The fourth embodiment is the gasket of the second embodiment.
A peripheral groove 26a wider than the diameter of the small groove 26 is formed on the entire upper surface of the upper surface 14, and the small groove 26 is opened on the bottom surface of the peripheral groove 26a. Therefore, according to the fourth embodiment, the oil B that has flowed down the inner peripheral surface of the band-shaped filter 12 and flows downward is temporarily stored in the peripheral groove 26a and then passes through the small groove 26 to enter the outer peripheral side space 18. It will be leaked.

The fifth embodiment of the present invention shown in FIGS. 9 and 10 is a holding plate.
An annular groove 14a is formed on the peripheral edge of the upper surface of the gasket 14 on the lower end side mounted on the upper surface of 16, and the lower ends of the band-shaped filter 12 and the through hole forming tube 12x are embedded in the annular groove 14a,
In addition, a small groove 27 extending radially outward from the annular groove 14a is formed in the peripheral edge of the upper surface of the gasket 14, so that the small groove 27 communicates with the through hole 12y of the through hole forming tube 12x via the band-shaped filter 12. It is composed. Therefore, this fifth
Also in the embodiment, the oil B that has flowed down along the inner peripheral surface of the band-shaped filter 12 and flows down during the regeneration passes through the through hole 12y and the small groove 27 together with the compressed air A ', and flows out to the outer peripheral side space 18. .

The sixth embodiment of the present invention shown in FIGS. 11 and 12 is to form a flow hole 28 having a large flow passage area across both the gasket 14 and the holding plate 16 on the lower end side and to filter the filter in the middle thereof. 29
Is installed. According to such a configuration, the oil B that has flowed down along the inner peripheral surface of the band-shaped filter 12 passes through the circulation hole 28 together with the compressed air A ′ during regeneration, and of course flows out to the outer space. In some cases, the circulation hole 28
Although the flow passage area is large, the action of the filter 29 prevents the oil in the compressed air from flowing inward.

[Effect of device]

As described above, according to the present invention, the gap on the lower end side that closes the lower end of the gap formed between the band-shaped filter and the adsorbent, or on both the gasket and the holding plate, has the gap. Since the passage that connects the lower end and the outer space of the band filter is formed, the oil that has flowed down along the inner peripheral surface of the band filter passes through the passage together with the compressed air during regeneration and passes through the outer space of the band filter. Therefore, the problem that an oil pool is generated at the lower end of the gap is avoided, and the life of the adsorbent is extended.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional front view of a main part of a dehumidifying device showing a first embodiment of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a second embodiment of the present invention. 4 is a vertical sectional front view of the main part of the dehumidifier.
Fig. 3 is a view taken along the line IV-IV in Fig. 3, Fig. 5 is a vertical sectional front view of a main part of a dehumidifying device showing a third embodiment of the present invention, and Fig. 6 is Fig. 5 VI.
-VI line arrow view, FIG. 7 is a longitudinal sectional front view of a main part of the dehumidifying device showing the fourth embodiment of the present invention, FIG. 8 is a line VIII-VIII line view of FIG. 7, and FIG. 9 is the present invention. 10 is a vertical sectional front view of a main portion of a dehumidifying device showing a fifth embodiment of the present invention, FIG. 10 is a vertical sectional view of a dehumidifying device showing a sixth embodiment of the present invention, and FIG. The front view and FIG. 12 are views taken in the direction of arrows in FIG. Also, thirteenth
The figure is a vertical sectional front view showing the entire structure of a conventional dehumidifier,
FIG. 15 is a semi-vertical front view showing the internal structure of a cylindrical chamber in a conventional dehumidifier, and FIGS. 15 and 16 are longitudinal front views of essential parts of the dehumidifier showing conventional problems. 1 …… Main body 2 …… Inflow port 3 …… Outflow port 4 …… Drain discharge port 10 …… Cylinder chamber 11 …… Adsorbent material 12 …… Band-shaped filter 12a, 14 …… Gasket on lower end side 16 …… Holder Plate 18 ... Passageway 24 ... Gap 25,26,27,28 ... Passage

Claims (1)

[Scope of utility model registration request] 1. A main body is provided with a cylindrical chamber communicating with each of an inflow port, an outflow port and a drain discharge port, and an adsorbent in which adsorbent particles are porously molded and fixed in a cylindrical shape in the cylindrical chamber. , A band-shaped filter wound around the outer peripheral surface of the adsorbent, and elastic gaskets attached to the upper end and the lower end of the band-shaped filter, respectively, to form a gap between the adsorbent and the band-shaped filter, In the dehumidifier in which the upper end and the lower end of this gap are closed by the upper end side gasket and the lower end side gasket, respectively, the lower end side gasket or the lower end side gasket and this gasket are A dehumidifying device characterized in that a passage that connects the lower end of the gap and the outer peripheral side space of the band-shaped filter is formed on both of the holding plate that is more supported.