JPH0249498Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a compressed air dehumidifier that supplies clean, dry air to a place where equipment that is sensitive to humidity is manufactured.

Prior Art As shown in FIG. 8, a conventional compressed air dehumidifying device connects a compressed air cooling/dehumidifying device 1 and a filter 2 in series with piping to guide dehumidified compressed air to the filter 2. oil,
I tried to remove dust etc.

In the figure, 3 is a cooling chamber equipped with an evaporator 4, 5 is a reheater that exchanges heat between the compressed air flowing from the cooling chamber 3 to the air outlet 6 and the compressed air flowing from the air inlet 7 to the cooling chamber 3, and 8 is a reheater. The outer cylinder, 9 is a filter element 10, is a filter case, and 11 is a pipe.

Problems to be Solved by the Invention However, when the conventional cooling and dehumidifying device 1 and filter 2 are configured separately, two devices are required, which complicates piping and causes high costs. There were some inconveniences as the overall size of the device increased and the installation space increased.
Also, looking at just the heat exchanger, the pre-cooling method is configured so that the air flows inside and outside the reheater in parallel, so in order to perform sufficient pre-cooling, a very large number of heat transfer pipes are required. There was a problem in miniaturizing the heat exchanger because of the need for heat exchangers.

Therefore, there has been a desire for a low-cost, compact compressed air dehumidifier.

Means for Solving the Problem In other words, the present invention includes a substantially cylindrical cooling chamber housing the evaporator of the refrigeration cycle, which is mounted eccentrically downward inside an outer cylinder forming a heat exchanger, and A pre-cooling chamber disposed on the outer periphery, a directional return flow path communicating the pre-cooling chamber and the cooling chamber, and a collection tank provided at one end of the outer cylinder that guides the compressed air that has passed through the cooling chamber and the pre-cooling chamber to the outlet. A plurality of heat transfer pipes communicating the cooling chamber and the collection chamber are disposed in the preliminary cooling chamber, and the compressed air inlet is located on the downstream side of the gas flowing through the heat transfer pipes of the preliminary cooling chamber. This objective is achieved by a pre-cooling chamber dehumidifier installed in the cooling chamber and equipped with a filter in the collection chamber.

Further, in order to increase the coefficient of thermal inertia of the pre-cooling chamber, a baffle plate is fixed to the heat transfer pipe of the pre-cooling chamber to meander the flow of air flowing in from the compressed air inlet.

Function In the compressed air dehumidification device according to the present invention, moist air flowing in from the compressed air inlet first enters the pre-cooling chamber, and the direction is changed by the double plate and the cooling air flows through the heat transfer pipe in a meandering manner. Replaced, pre-cooled and dehumidified. The air leaving the pre-cooling chamber then flows into the cooling chamber via the direction change channel. There, the air is further dehumidified and cooled, resulting in dry air. The air dried in the cooling chamber then flows through heat transfer pipes and is sent to the collection chamber. When flowing through the heat transfer pipe, the air is heated by exchanging heat with the moist air flowing around the heat transfer pipe. As a result, the humidity of the dry air is relatively reduced. Next, the air that enters the collection chamber is filtered from dust, oil, etc. contained in the air by a filter installed in the collection chamber. The clean air is then supplied to a predetermined location from the compressed air outlet.

In the device of the present invention, the pre-cooling chamber is configured to meander the air passing through the buff-full plate, so the contact area of the air with the heat transfer pipe is wider than in conventional devices, and the pre-cooling chamber is The passage time through the cooling chamber becomes longer.

Embodiment The present invention will be explained in detail below according to an embodiment shown in the drawings.

In FIG. 1, a cooling chamber 25 is formed by accommodating an inner cylinder 24 inside a substantially cylindrical outer cylinder 23, which has a compressed air inlet 21 and a compressed air outlet 22 close to each other on its outer peripheral surface. An evaporator 26 of a refrigeration cycle (not shown) is installed in the cooling chamber 25.

27 is a cooling pipe of the evaporator, and 28 is a cooling fin of the evaporator. A support plate 29 closes one end of the inner cylinder 24, fixes it to the outer cylinder 23, and defines a collection chamber 30 having a compressed air outlet 21.

Further, on the outer circumference of the inner cylinder 24, there is a shielding plate 31 fixed to the end of the inner cylinder 24 and the inner wall surface of the outer cylinder 23, and a partition fixed to the outer surface of the inner cylinder 24 and the inner surface of the outer cylinder 23. A preliminary cooling chamber 33 is provided which is partitioned by a plate 32. Inside the preliminary cooling chamber 33, a plurality of heat transfer pipes 40 are connected to the shielding plate 31 and the support plate 29 to communicate the collection chamber 30 and the cooling chamber 25. These heat transfer pipes 40 include a second
As shown in the figure, a buffle plate 34 is fixed approximately perpendicularly to the heat transfer pipe in order to cause the compressed air flowing in the preliminary cooling chamber 33 to meander and increase the coefficient of thermal inertia. 35 is an air outlet opened in the partition plate 32. This air outlet 35 is provided on the upstream side of the cooling air flowing inside the heat transfer pipe 40. Therefore, the cooling air flowing through the heat transfer pipe 40 and the air flowing around the outer periphery of the heat transfer pipe 40 are opposed in flow.

36 is an air inlet opened in the inner cylinder 24;
This air inlet 36 is provided on the support plate 29 side.

Therefore, the space partitioned by the inner tube 24, the partition plate 32, and the outer tube 23 serves as a direction changing flow path 37 that communicates the preliminary cooling chamber 33 and the cooling chamber 25.

Note that 38 shown in FIG. 2 is a swirling ribbon inserted into the pipe 40 to increase the heat exchange efficiency of the heat transfer pipe 40, and 39 covers the inner cylinder 24 to prevent air from leaking from the partition plate 32. Therefore, the cover is fixed to the support plate 29, the shield plate 31, and the partition plate 32.

Next, the filter installed in the collection chamber 30 is attached to a heat transfer pipe 40 as shown in FIGS. 1 and 4.
A holding plate 42 that partitions into two chambers an upstream side facing the outlet 41 and a downstream side facing the compressed air outlet 22 is fixed to the outer cylinder 23, and a bracket 43 is welded to the side of the outlet of the heat transfer pipe 40 of the holding plate 42. Furthermore, the filter 4 is attached to this bracket 43 with a fixing rod.
4 to the retaining plate 42 with the tightening nut 4.
It consists of a fixed number of 5. 46 is an O-ring installed between the holding plate 42 and the filter 44 to prevent air leakage.

Another mounting method is to make the retainer plate 42 female-threaded as shown in FIG.
A conceivable method is to make a part of the filter 44 into a male thread shape and screw the filter 44 into the holding plate 42 to fix it.

Furthermore, it is conceivable that the filter 44 is not just one filter, but as shown in FIG. 6, two or more types of filters with different filtration rates or functions are arranged in series using holding plates 42a and 42b. However, in this case, if the retaining plate 42b is fixed to the outer cylinder 23, it becomes impossible to replace the filter element. Therefore, the holding plate 42
b is configured to be in sliding contact with the outer cylinder 23 as shown in FIG. 7, and a recess 47 is provided in a part of the sliding contact part of the holding plate 42b, and an O-ring 46 is fitted into the recess 47 to seal it. It is necessary.

With the above configuration, in the compressed air dehumidifying device according to the present invention, the compressed air flowing in from the compressed air inlet 21 is almost connected to the heat transfer pipe 40 by the buff-full plate 34 fixed to the heat transfer pipe 40. It flows while meandering at right angles. and heat transfer pipe 40
Precooling and dehumidification are performed by exchanging heat with the cooling air flowing inside. At this time, the temperature difference between the inside and outside of the heat transfer pipe 40 is approximately equal because the air flows are configured to face each other.

The air precooled and dehumidified in the precooling chamber 33 flows into the cooling chamber 25 through the direction changing channel 37,
Here, the refrigeration cycle's evaporator 26 further dehumidifies and
The air becomes cool and dry. The air cooled and dehumidified in the cooling chamber 25 flows into the collection chamber 30 through the heat transfer pipe 40. At this time, the heat transfer pipe 4
The air flowing inside the tube exchanges heat with the air flowing around the outer circumference of the heat transfer pipe, and its temperature increases. The dry air that has entered the collection chamber 30 is cleaned of dust, oil, etc. contained in the air by a filter installed in the collection chamber 30. The air is then supplied to a designated location as clean, dry air.

Effects As described above, the compressed air dehumidifier according to the present invention differs from the conventional structure in the pre-cooling chamber in that the air flowing inside and outside the heat transfer pipe is opposed to each other, and the outer periphery of the heat transfer pipe is Since the flowing air is meandered using a baffle plate to increase the rate of inertia, sufficient pre-cooling and dehumidification can be performed, resulting in a higher dehumidifying effect than the conventional method, and the effect of pre-cooling and dehumidifying the pre-cooling chamber. is high, so the number of heat transfer pipes is less than conventional ones,
The device can be made smaller. In addition, the device of the present invention
Since the filter is integrated with the outer cylinder that makes up the heat exchanger, it is more space-saving than conventional models.

[Brief explanation of the drawing]

1 to 7 show embodiments of a heat exchanger for a compressed air dehumidifying device according to the present invention, and FIG.
The figure is a vertical cross-sectional view of the device, Figure 2 is a partially transparent perspective view showing the state of the baffle plate installed in the pre-cooling chamber, Figure 3 is a cross-sectional view of Figure 1, and Figure 4 is a filter installation. Fig. 5 is a partial cross-sectional view showing the state in which the filter is installed, Fig. 6 is a partial vertical cross-sectional view showing the state in which the filter is installed double, and Fig. 7 is the installation of the filter. FIG. 8 is a partial cross-sectional view showing the state, and FIG. 8 is a longitudinal cross-sectional view of the device showing the prior art. 21... Compressed air inlet, 22... Compressed air outlet, 23... Outer cylinder, 24... Inner cylinder, 25... Cooling chamber, 26... Evaporator, 27... Cooling pipe, 28...
Cooling fin, 29... Support plate, 30... Collection chamber,
31... Shielding plate, 32... Partition plate, 33... Pre-cooling chamber, 34... Full plate, 35...
Air outlet, 36... Air inlet, 37... Direction changing channel, 40... Heat transfer pipe, 41... Outlet, 42
...Retaining plate, 43...Bracket, 44...Filter, 45...Nut, 46...O ring, 4
7... Concavity.

Claims (1)

[Claims for Utility Model Registration] (1) An evaporator 26 of a refrigeration cycle installed eccentrically downward inside an outer cylinder 23 forming a heat exchanger.
a substantially cylindrical cooling chamber 25 accommodating the cooling chamber 25; a preliminary cooling chamber 33 disposed around the outer periphery of the cooling chamber 25;
A direction return channel 37 that communicates between the preliminary cooling chamber 33 and the cooling chamber 25, and the cooling chamber 25 and the preliminary cooling chamber 3.
3, and a collecting chamber 30 provided at one end of an outer cylinder 23 for guiding the compressed air passed through the cooling chamber 33 to the outlet 22. Compressed air characterized in that a pipe 40 is provided, the compressed air inlet 21 is provided on the downstream side of the gas flowing through the heat transfer pipe 40 of the preliminary cooling chamber 33, and a filter is installed in the collection chamber 30. Dehumidifier. (2) Utility model registration claim 1, characterized in that a buttful plate 34 is fixed to the heat transfer pipe 40 of the preliminary cooling chamber 33 for meandering the flow of air flowing in from the compressed air inlet 21.
The compressed air dehumidifier described in Section 1. (3) The compressed air according to claim 1 or 2 of the utility model registration claim, characterized in that a swirling ribbon 38 for increasing the heat exchange rate is inserted into the heat transfer pipe 40 provided in the preliminary cooling chamber 33. Dehumidifier. (4) The filter installed in the collection chamber 30 is installed so as to communicate with a holding plate that divides the upstream side facing the outlet of the heat transfer pipe into two chambers and the downstream side facing the compressed air outlet 22 into two chambers. A compressed air dehumidifying device according to claim 1, 2 or 3 of the utility model registration claim. (5) The filter installed in the collection chamber 30 is installed so as to connect each chamber to a retaining plate that divides the upstream side facing the outlet of the heat transfer pipe and the downstream side facing the compressed air outlet 22 into three chambers. A compressed air dehumidifying device according to claim 1 or 2 or 3 of the utility model registration claim, characterized in that: