JPH0842714A - Leakage preventing mechanism for rotary sliding valve plate - Google Patents

Abstract

PURPOSE:To prevent a separated gas from being leaked from the sliding part of a rotary sliding valve plate used for a gas separating device. CONSTITUTION:Sealed spaces D for enclosing rotary sliding valve plates 2a, 2b, respectively, are formed of an adsorption a tower body 1a slid with the rotary sliding valve plates 2a, 2b, and sliding members such blind patches 3a, 3b, and radial first bypass circuits A, A' are provided on the rotary sliding valve plates 2a, 2b, avoiding opening parts 21a, 21b, 22a, 22b provided for switching the flows, respectively. Further, second bypass circuits B for allowing the sealed spaces D to mutually communicate are provided on the absorption tower body 1a slid with the rotary sliding valve plates 2a, 2b on both the end parts, and a third bypass circuit C for connecting the sealed space D to a specified port of the adsorption tower body is provided on one of the blind patches 3a, 3b slid with the outsides of the rotary sliding valve plates 2a, 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a gas separator, a solvent recovery device, a rotary device of a gas heat exchanger, etc., which uses a rotary slide type valve plate, and the rotary slide of a rotary sliding valve plate. The present invention relates to a rotary sliding valve plate leakage prevention mechanism that prevents fluid from leaking from a portion.

[0002]

2. Description of the Related Art A gas separating device is a typical example of a rotary device having a rotary sliding valve plate. Such a gas separation device is generally a device that separates a specific component in a gas using an adsorbent housed inside, as seen in a dehumidification device, an oxygen production device, a nitrogen production device, and the like. is there.

Further, in such a gas separation device,
As a technique for separating the adsorbed substance adsorbed by the adsorbent, a temperature swing method that uses a change in adsorption force due to a temperature difference and a pressure swing method that uses a change in adsorption force due to a pressure difference are generally well known. In both cases, an independent gas flow is formed on the supply side that supplies the raw material gas to adsorb the adsorbed substance to the adsorbent and on the regeneration side that separates the adsorbed substance and regenerates the adsorbent. Need to let. As a concrete means, a rotary sliding valve plate provided with completely separate and independent openings for supply and regeneration is continuously slid to form an independent gas flow. ing.

FIG. 2 shows a general structural exploded view of a gas separation device using a rotary sliding valve plate which enables such independent gas flows.

In the figure, the raw material gas m passes through an opening 031b formed in a lower blind plate 03b of the gas separation device 010 by a blower 08, and an opening 02 for flow switching.
1b and 022b are provided, and the rotary sliding valve plate 02 is slidably rotated between the upper surface of the lower blind plate 03b and the lower surface of the adsorption tower 01.
b through the opening 021b on the side corresponding to the opening 031b, and is sent to the adsorption tower 01 having an adsorption step tank 01a having an opening 011 (see FIG. 3) communicating with the opening 021b.
The exhaust gas e after adsorbing the substance to be adsorbed in the raw material gas m with the adsorbent 01c loaded in the adsorption tower 01 is provided with the openings 021a and 022a for switching the flow.
No. 021a of the upper blind plate 03a after passing through the opening 021a communicating with the outlet 012 of the adsorption process tank of the rotary sliding valve plate 02a that slides and rotates between the upper surface of 1 and the lower surface of the upper blind plate 03a. Is discharged to the outside of the gas separation device 010.

The regeneration gas r is completely separated from the flow of the raw material gas m to form an independent gas flow. That is, the regeneration gas r passes through the opening 032a of the upper blind plate 03a of the gas separation device 010, and the opening 0 is opened corresponding to the opening 032a of the rotary sliding valve plate 02a.
It is sent to the adsorption tower 01 through 22a. Adsorption tower 01
The regeneration gas r, which communicates with the opening 022a and flows into the adsorption tower 01 through the opening 013, adsorbs the substance to be adsorbed by the adsorbent 01c loaded in the regeneration process tank 01b of the adsorption tower 01. It is desorbed from the agent 01c, passes through the opening 022b of the rotary sliding valve plate 02b communicating with the outlet 014 of the regeneration process tank 01b together with the regeneration gas r, and corresponds to the opening 022b of the lower blind plate 03b. The adsorbent in the regeneration process tank 01b is regenerated by passing through the opened opening 032b and discharged to the outside of the gas separation device 010.

Generally, a suction system utilizing a vacuum pump 09 as shown in the figure is adopted to convey the regeneration gas r, but the regeneration gas r is blown from the upper part of the gas separation device 010. In some cases, a forced air blowing method that operates by being used is adopted.

In the above description, the adsorption process tank 01
Although the a and the regeneration process tank 01b are described as separate bodies, this is merely for distinguishing whether the adsorbent 01c contained therein is in the adsorption state or the regeneration state. It is called.

Next, FIG. 3 shows the gas separation device 010 described above.
The general cross-section figure of is shown. As shown in the figure, the adsorption tower 01 is supported by the structural body 01d through the support material 01e,
Rotary sliding valve plate 02 mounted above and below the adsorption tower 01
a and 02b are pressed against the sliding surfaces formed on the upper and lower surfaces of the adsorption tower 01 by springs 07a and 07b that press through the upper and lower blind plates 03a and 03b, respectively, and the shaft 04a and the bearing It is rotated by the drive device 06 via 04b, the key 04c, and the joint 05.

Thus, the inner and outer peripheral sides of the sliding portion between the rotary sliding valve plate 02b and the lower blind plate 03b and the lower surface of the adsorption tower 01, and the rotary sliding valve plate 02a and the upper side. The lower surface of the blind plate 03a and the inner peripheral side and outer peripheral side of the sliding portion with the upper surface of the adsorption tower 01 are both open to the outside of the gas separation device 010, and the raw material gas flowing through the gas separation device 010. The m, the exhaust gas e, the regeneration gas r, and the regeneration gas c containing the substance to be adsorbed leak to the outside of the gas separation device 010 through these sliding parts.

The leakage of the raw material gas m and the regenerating gas r to the outside of the gas separating device 010 is caused by the rotary sliding valve plate 0.
It is generally performed to suppress the leakage by improving the processing accuracy of the sliding portions of 2a and 02b and minimizing the sliding surface gap, but it is difficult to completely prevent the leakage. In particular, in the gas separation device 010 that handles a raw material gas containing a hazardous substance having toxicity and explosiveness, even if the gas leakage inside the device is allowed to some extent, a mechanism for completely preventing the gas leakage to the outside of the device is required. Becomes

[0012]

DISCLOSURE OF THE INVENTION The present invention completely prevents fluid leakage from the sliding portion of the rotary sliding valve plate to the outside of the device in the device having such rotary sliding valve plate. An object of the present invention is to provide a rotary sliding valve plate leakage prevention mechanism capable of performing the above.

[0013]

For this reason, the rotary sliding valve plate leakage prevention mechanism of the present invention has the following means. (1) A sealed space that completely encloses each of the two rotary sliding valve plates is provided by a sliding member that slides on the rotary sliding valve plate and rotatably sandwiches the rotary sliding valve plate. (2) The first bypass circuit is bored in the radial direction of the rotary sliding valve plate, avoiding the fluid passage opening formed in the rotary sliding valve plate. (3) The two sealed spaces enclosing each of the two rotary sliding valve plates are provided with the second bypass circuit communicating with each other in the sliding member interposed between the rotary sliding valve plates. (4) A third bypass circuit communicating with the outside of one of the sealed spaces enclosing the two rotary sliding valve plates is provided in the sliding member.

[0014]

According to the rotary slide valve plate leakage prevention mechanism of the present invention, by the above-mentioned means, (1) the fluid introduced to the device having the rotary slide valve plate leakage prevention mechanism is transferred to the sliding member respectively. An attempt is made to leak to the outer and inner peripheral directions of the rotary sliding valve plate through the gaps in the sliding part formed by the rotary sliding valve plate, but with the sliding members that sandwich the rotary sliding valve plate vertically. By enclosing in a closed space having a closed structure, leakage to the outside of the device is prevented. (2) A first bypass circuit is provided in the radial direction on the rotary sliding valve plate at a position where it does not interfere with the opening provided separately for flow switching, and the sliding part is provided on the rotary sliding valve plate. The leak gas flowing in the outer peripheral direction and the leak gas flowing in the inner peripheral direction can be pressure balanced. (3) A second bypass circuit that connects the rotary sliding valve plates that slide and rotate on both sides of the sliding member to each other in the sealed spaces that enclose the sliding members is interposed between the rotary sliding valve plates. By piercing the moving member, it is possible to balance the leakage gas flowing into each of the two sealed spaces in the apparatus in terms of pressure. (4) By providing the third gas bypass circuit in the sliding member forming one closed space of the closed spaces,
The closed space can be pressure-balanced with the outside of the device. As a result, it is possible to prevent the leakage gas from the sliding portion of the device from being released to the outside in an uncontrolled state. Also, this third
Depending on the purpose of the enclosed space device in which the bypass circuit of (1) is provided, it does not have any particular restriction because it changes, and it can be connected to a device of a completely different system.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary sliding valve plate leakage prevention mechanism of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional structural view in which an embodiment of the rotary sliding valve plate leakage prevention mechanism of the present invention is applied to a gas separation device.

The rotary sliding valve plates 2a and 2b mounted on and under the adsorption tower body 1a of the adsorption tower 1 are respectively the upper blind plate 3
a, the lower blind plate 3b, the springs 7a, 7b are pressed against the sliding surfaces formed on the upper surface and the lower surface of the adsorption tower body 1a by the pressing force of the springs 7a, 7b, and the shaft 4a, the bearing 4b, the key 4c, the joint 5 It is rotated by the drive device 6 via.

The adsorption tower 1 fixes the adsorption tower body 1a, the adsorbent 1b housed in the adsorption tower body 1a, the wire netting 1c for fixing the adsorbent 1b, and the adsorption tower 1 to an external structure 1f. It is composed of a fixed hardware 1e for. A rotary slide valve plate 2 is provided on the outer peripheral surfaces of the upper and lower ends of the adsorption tower body 1a.
A flange portion is formed for sealing a and 2b, and a seal mechanism 1d is provided on the outer peripheral surface of the flange portion. Further, the adsorption tower body 1a is provided with a second (gas) bypass circuit (B) in the axial direction of the inner peripheral portion.

The rotary sliding valve plates 2a and 2b are provided with gas raw materials for the pressure balance of the gas leaking in the outer and inner circumferential directions of the rotary sliding valve plates 2a and 2b, respectively. m for supplying m and for regenerating the adsorbent 1b in the adsorption tower 1, the openings 21 are provided separately from each other.
a, 21b, 22a, 22b in a position that does not interfere with the first
(Gas) bypass circuits A and A'are provided in the radial direction.

The upper blind plate 3a and the lower blind plate 3b are also
Each of the rotary sliding valve plates 2a and 2b is attached to the adsorption tower body 1a.
In order to form a closed space D in cooperation with, a cylindrical flange is provided. At the center of the lower blind plate 3b, a seal mechanism 4d is provided in order to achieve airtightness of a penetrating portion through which the drive shaft 4a penetrates. Leakage gas from the sliding portion, which is stored in the gas separating device 10 and is pressure-balanced by the first gas balance circuits A and A ′ and the second gas bypass circuit B in the upper blind plate 3a. Third (gas) bypass circuit C for connecting the external storage device to the
Is provided.

Since the present embodiment is constructed as described above, the opening 31b of the lower blind plate 3b, the opening 21b of the rotary sliding valve plate 2b, and the supply port 1g of the adsorption tower body 1a.
The raw material gas m which is introduced into the gas separation device 10 through
After passing through the opening 31b of the lower blind plate 3b, between the rotary sliding valve plate 2b and the lower blind plate 3b, and the rotary sliding valve plate 2
After passing through the opening 21 of b, the valve plate having a small sliding path passes through the gaps between the sliding parts formed between the rotary sliding valve plate 2b and the lower surface of the adsorption tower body 1a. 2b leaks toward the outer peripheral direction of the valve plate 2b, but similarly leaks toward the inner peripheral direction of the valve plate 2b having a small sliding portion path through the gap of the sliding portion and the first gas bypass. It is pressure balanced by the circuit A '.

Similarly, the rotary sliding valve plate 2a above the adsorption tower 1
Also, regarding the outer peripheral direction and the inner peripheral direction of the rotary sliding valve plate 2a, the leakage gas is pressure balanced by the first gas bypass circuit A.

Further, in the respective closed spaces D formed by enclosing the rotary sliding valve plate above and below the adsorption tower 1, the leak gas, which is pressure balanced as described above, is The second gas bypass circuit B provided in the main body further balances the pressure, and finally, the entire leaked gas in the gas separation device 10 is pressure balanced.
Further, the leakage gas balanced in the gas separation device 10 is pressure-balanced with the inside of the storage device provided outside the gas separation device 10 in the closed space D by the gas bypass circuit C provided in the upper blind plate 3a. It becomes possible.

However, the gas balance circuit C is provided for each port of the gas separation apparatus 10, that is, the supply port 1g, the discharge port 1h, the regeneration gas port 1j, or the regeneration port 1k provided in the adsorption tower body 1a. You can also connect to either. These selections vary depending on the purpose of the gas separation device 10, and are not particularly limited, and it is possible to connect to a leak gas recovery device of a completely different system.

[0024]

As described above, according to the rotary sliding valve plate leakage prevention mechanism of the present invention, with the structure shown in the claims, the rotation between the sliding members to switch the flow is performed. The fluid leaking from the sliding portion formed between the sliding valve plate and the sliding member does not flow out of the device, that is, around the device.

As a result, it is possible to operate safely even in a device that handles a raw material gas containing a hazardous substance that is toxic or explosive.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a rotary sliding valve plate leakage prevention mechanism of the present invention,

FIG. 2 is an exploded structural view of a gas separation device using a conventional rotary sliding valve plate,

3 is a cross-sectional view of the gas separation device shown in FIG.

[Explanation of symbols]

1 Adsorption Tower 1a Adsorption Tower Main Body as Sliding Member 1b Adsorbent 1c Whole Network 1d Sealing Mechanism 1e Fixed Hardware 1f Structure 1g Supply Port 1h Discharge Port 1j Regeneration Gas Port 1k Regeneration Port 2a, 2b Rotary Sliding Valve 21a, 21b, 22a, 22b Opening 3a Upper blind plate as sliding member 3b Lower blind plate as sliding member 31b Opening 4a Shaft 4b Bearing 4c Key 5 Joint 6 Drive device 7a, 7b Spring A First gas bypass circuit B Second gas bypass circuit C Third gas bypass circuit D Closed space

Claims (1)

[Claims] 1. A rotary sliding valve plate having a flow switching opening and a coaxially arranged opening, and an opening communicating with the opening, the rotary sliding valve plate being provided in each of the rotary sliding valve plates. In a rotary sliding valve plate leakage prevention mechanism for preventing fluid leakage from a sliding portion with a sliding member that is rotatably sandwiched, each rotary sliding valve plate formed of the sliding member is encapsulated. A closed space, a first bypass circuit that is formed in the radial direction of the rotary sliding valve plate while avoiding the opening, and the sliding member that is interposed between the rotary sliding valve plate. A rotation characterized in that a second bypass circuit for communicating the sealed spaces with each other and a third bypass circuit provided in the sliding member for communicating one of the sealed spaces with the outside are provided. Sliding valve plate leakage prevention device.