Filtering device suitable for purifying dry gas sealing gas

Abstract

The invention discloses a filter device for purifying dry gas sealing gas, which comprises a filter cavity, and an inlet side pressing end cover (22) and an outlet side pressing end cover (21) are respectively and fixedly connected to two ends of the filter cavity, and is characterized in that the filter cavity is a graded filter cavity, and the inlet side pressing end cover (22) and the outlet side pressing end cover (21) are fixedly connected to two ends of the filter cavity; a dust removal cavity, a water absorption cavity (5) and an acid and alkali impurity removal cavity (4) are sequentially arranged in the direction from the inlet to the outlet; an annular supporting part (62) is mounted on the inner wall of the dust removal cavity (6), and a dust removal filter screen (61) is fixed to the inner side of the supporting part; a plurality of water absorption columns (52) are arranged in the water absorption cavity (5), a plurality of holes are formed in the water absorption columns, the holes are filled with water absorption particles (53), and separation nets (51) are fixed to the end faces of the water absorption columns; the acid and alkali impurity removal cavity (4) internally comprises an acid removal cavity (42) and an alkali removal cavity (41), acid absorption paper is arranged on the side wall of the acid removal cavity, and alkali absorption paper is arranged on the side wall of the alkali removal cavity.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, and in particular to a filtering device suitable for purifying dry gas sealing gas. Background Art

[0002] Dry gas seal is a new type of shaft end seal that uses slotted sealing technology for gas sealing. It is a new type of non-contact sealing method that has emerged in recent years. Compared with traditional contact seals, dry gas seals have the characteristics of long service life, stable and reliable operation, and low sealing power consumption. It can achieve low energy consumption operation with small end face friction and low leakage, and is widely used in shaft end seals of rotating machinery such as compressors and turbine machinery.

[0003] However, in actual practice, since the sealing gas contains a variety of impurities, the presence of these impurities will affect the sealing effect of the dry gas seal, such as: (1) Particles in the gas will enter the dry gas seal end face, causing end face wear and increasing friction. In severe cases, the sealing element will deform and fail; (2) The presence of moisture in the gas may cause corrosion of the seal end face, affecting the sealing effect. Moreover, moisture freezes at low temperatures and may block the small hole channels in the pneumatic system; (3) Acids and alkalis contained in the gas may corrode the sealing material, reduce the sealing performance, and in severe cases may cause the seal to fail. Therefore, during the operation of the dry gas seal, the content of particles, moisture, and acid and alkali substances in the air needs to be strictly controlled to ensure the stability and reliability of the seal. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a filtering device suitable for purifying dry gas sealing gas, which solves the problem that there are multiple impurities in the existing sealing gas, causing the dry gas seal to be unable to obtain excellent sealing performance, realizes the purification of the dry gas sealing gas, and ensures the safe, stable and reliable operation of the dry gas sealing. The specific scheme is as follows.

[0005] A filtering device for purifying dry gas sealing gas comprises a filtering cavity, wherein both ends of the filtering cavity are respectively fixedly connected with an inlet side clamping end cover and an outlet side clamping end cover, wherein the filtering cavity is a graded filtering cavity, and a dust removal cavity, a water absorption cavity and an acid and alkali impurity removal cavity are sequentially arranged from the inlet to the outlet.

[0006] Gaskets are provided on the interface between the inlet side pressing end cover, the dust removal cavity, the water absorption cavity, the acid and alkali impurity removal cavity and the outlet side pressing end cover.

[0007] The inlet side clamping end cover, the dust removal cavity, the water absorption cavity, the acid and alkali impurity removal cavity and the outlet side clamping end cover are provided with a plurality of sets of screw holes corresponding to each other around them, and are fixed by bolts.

[0008] The dust removal chamber, water absorption chamber and acid and alkali impurity removal chamber are in contact through gaskets; the acid and alkali impurity removal chamber, water absorption chamber and outlet side clamping end cover are connected through long bolts, and the gap between the acid and alkali impurity removal chamber and the outlet side clamping end cover is matched; the dust removal chamber is connected to the inlet side clamping end cover through short bolts.

[0009] The dust removal chamber has an annular support portion installed on its inner wall, a dust removal filter is fixed inside the support portion, a channel is opened below the dust removal chamber, and a dust collection box is provided below the channel, and a removable drawer is provided at the bottom or side of the dust collection box.

[0010] The installation method of the support part and the dust removal chamber is that a T-shaped protrusion is provided on the outer wall of the support part, and a T-shaped anti-slip groove matching it is provided on the inner wall of the dust removal chamber. The support part is installed on the inner wall of the dust removal chamber by embedding the T-shaped protrusion into the T-shaped anti-slip groove.

[0011] The dust filter is fixed to the support part in such a way that an annular step is provided inside the support part, an outer edge matching the annular step is provided outside the dust filter, and the outer edge is fixed to the annular step by screws.

[0012] The interface between the annular step and the outer edge is filled with filler, and the filler is a sealing material.

[0013] The water absorption cavity has a plurality of water absorption columns arranged inside, a plurality of holes are opened in the water absorption columns, the holes are filled with water absorption particles, and a partition net is fixed on the end surface of the water absorption column.

[0014] The water absorption column is in the shape of a cube.

[0015] The water absorption columns are fixedly arranged on a disc-shaped water absorption plate, the inner wall of the water absorption cavity is provided with an inwardly concave annular step, and the water absorption plate is embedded in the inner wall of the water absorption cavity through the step.

[0016] The acid-alkali impurity removal cavity comprises an acid-removal cavity and an alkali-removal cavity. The side wall of the acid-removal cavity is provided with acid-absorbing paper, and the side wall of the alkali-removal cavity is provided with alkali-absorbing paper.

[0017] The acid-base impurity removal cavity has a test cavity on its outer wall, the test cavity is connected to the inside of the acid-base impurity removal cavity through a medium flow channel, acid-base test paper is arranged in the test cavity, and a transparent observation window is opened on the test cavity.

[0018] The observation window is surrounded by square rubber gaskets, which are fixed by screws. The observation window is tempered glass.

[0019] The working principle of this technical solution is: 1. First, the sealing gas enters the dust removal chamber from the through hole on the compression end cover on the inlet side. The dust removal chamber, dust removal net, support part, dust collection box and other structures form a dust removal system. The dust removal net effectively blocks and removes dust particles and collects and cleans them through the dust collection box; 2. Then, the sealed gas enters the water absorption cavity. The water absorption cavity, the partition net, the water absorption column, the spherical water absorption particles and other structures form a water removal system. When the sealed gas passes through the water absorption system, the water is absorbed and removed from the sealed gas, thereby achieving the function of removing the water in the sealed gas; 3. Then, the sealed gas enters the acid and alkali impurity removal chamber. The acid and alkali impurity removal chamber, acid absorption paper, alkali absorption paper, acid and alkali test paper, test chamber and other structures form an acid and alkali removal system. The acid absorption chamber and alkali absorption chamber where the acid absorption paper and alkali absorption paper correspond are different sub-chambers of the same working chamber. When the gas moves, the acid and alkali impurities in the sealed gas can be removed; 4. Finally, the gas flows to the outlet side and tightens the end cover to complete the purification of the sealed gas.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This filter device can purify the dry gas sealing gas and remove dust, moisture and acid and alkali impurities in the gas, ensuring the purity of the dry gas sealing gas and achieving reliable operation; 2. This filter device can realize the installation and removal of the end cover, acid and alkali impurity removal chamber, water absorption chamber, and dust removal chamber through long and short connecting bolts, and is also convenient for the replacement of water absorption materials and dust-proof materials. All components are detachable components, which are easy to install and replace. It has the characteristics of simple structure and convenient process operation; 3. The dust removal system of this filtering device adopts electrostatic attraction technology to gather the dust in the sealed gas and then treat it uniformly, which has the characteristics of simple treatment and high efficiency; 4. The water absorption system of this filter device uses spherical water-absorbing particles filled in the water-absorbing column, which are cheap and easy to obtain. The sealed gas is adsorbed by multiple water-absorbing particles in sequence, and the water removal effect is obvious. In addition, since the water-absorbing particles are naturally filled and there is no compaction phenomenon, it will not affect the normal flow of the sealed gas; 5. This filter device can detect whether the acid and alkali impurities are completely removed by acid and alkali test paper, and check it in the test paper observation window, which is simple and convenient to judge whether the system is completely removed and works normally. The material of the observation window is tempered glass to prevent the observation window from being broken due to the impact of the sealing gas pressure, ensuring the safety of the working process, and the square rubber gasket is used to reduce the secondary leakage of the sealing gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of a specific embodiment of the present invention; Figure 2 A half-section isometric view of a specific embodiment of the present invention; Figure 3 It is a structural schematic diagram of a specific embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the compression end cover in a specific embodiment of the present invention; Figure 5 It is a structural schematic diagram of a dust removal chamber in a specific embodiment of the present invention; Figure 6 It is a cross-sectional view of the support portion and the dust filter in a specific embodiment of the present invention; Figure 7 It is a cross-sectional view of a water absorption system in a specific embodiment of the present invention; Figure 8 It is a schematic diagram of the structure of the acid-base impurity removal chamber in a specific embodiment of the present invention; Fig. 9 It is a schematic diagram of the structure of a gasket in a specific embodiment of the present invention; Fig.10 It is a schematic diagram of the structure of a bolt in a specific embodiment of the present invention.

[0022] Explanation of the reference numerals in the accompanying drawings: 11 long bolts, 12 short bolts; 21 outlet side pressing end cover, 22 inlet side pressing end cover, 23 second bolt hole; 3 observation window; 4 acid and alkali impurity removal chamber, 41 alkali removal chamber, 42 acid removal chamber, 43 test chamber, 44 medium flow channel; 5 water absorption chamber, 51 partition net, 52 water absorption column, 53 water absorption particles; 6 dust removal chamber, 61 dust removal filter, 62 support part, 63 dust collection box, 64 drawer plate, 65 filler, 66 T-shaped protrusion, 67 anti-slip groove, 68 first bolt hole; 7 washer. DETAILED DESCRIPTION

[0023] Example 1, see attached Figure 1-10 A filtering device for purifying dry gas sealing gas includes a filtering cavity, and the two ends of the filtering cavity are respectively fixed with an inlet side clamping end cover 22 and an outlet side clamping end cover 21. The characteristic is that the filtering cavity is a graded filtering cavity, and a dust removal cavity, a water absorption cavity 5 and an acid and alkali impurity removal cavity 4 are sequentially arranged from the inlet to the outlet.

[0024] The inlet side clamping end cover, the dust removal cavity, the water absorption cavity, the acid and alkali impurity removal cavity and the outlet side clamping end cover are provided with a plurality of sets of screw holes corresponding to each other around them, and are fixed by bolts.

[0025] The dust removal chamber 6 has an annular support portion 62 installed on its inner wall, a dust filter 61 is fixed inside the support portion, a channel is opened below the dust removal chamber, and a dust collecting box 63 is provided below the channel, and a removable drawer 64 is provided at the bottom or side of the dust collecting box.

[0026] The water absorption cavity 5 has a plurality of water absorption columns 52 arranged therein, a plurality of holes are opened in the water absorption columns, the holes are filled with water absorption particles 53, and a partition 51 is fixed to the end surface of the water absorption column. The water absorption column itself has a water absorption effect, and opening holes in the water absorption column and filling the water absorption particles can increase the water absorption effect. The partition can stabilize the water absorption column and the water absorption particles.

[0027] The acid and alkali impurity removal chamber 4 includes an acid removal chamber 42 and an alkali removal chamber 41. The side walls of the acid removal chamber are provided with acid absorbing paper, and the side walls of the alkali removal chamber are provided with alkali absorbing paper. The acid absorbing paper and the alkali absorbing paper can absorb acid and alkali impurities in the movement of gas to purify the acidity and alkalinity of the gas.

[0028] The acid-base impurity removal chamber has a test chamber 43 on its outer wall, which is connected to the inside of the acid-base impurity removal chamber through a medium flow channel 44. Acid-base test paper is provided in the test chamber, and a transparent observation window 3 is provided on the test chamber. During the movement of the gas, a small amount of sealed medium enters the test chamber through the flow channel to the acid-base test paper for detection, and the technician can check through the observation window to make a judgment on whether the acid-base impurities are completely removed and whether the system is working normally.

[0029] Embodiment 2, a filtering device suitable for purifying dry gas sealing gas, based on embodiment 1: The dust removal cavity, water absorption cavity and acid and alkali impurity removal cavity are in contact with each other through the gasket 7; the acid and alkali impurity removal cavity, water absorption cavity and the outlet side pressing end cover are surrounded by second bolt holes 23, connected by long bolts 11, and the acid and alkali impurity removal cavity and the outlet side pressing end cover are gap-matched; the water absorption cavity, dust removal cavity and the inlet side pressing end cover are surrounded by first bolt holes 68, connected by short bolts 12. The first bolt hole corresponds to the second bolt hole one by one, and the first bolt hole on the water absorption cavity also serves as the second bolt hole.

[0030] The inlet side compression end cap and the outlet side compression end cap adopt a stepped interface, which is convenient for connection with other pipeline systems. The size of the inlet side interface is larger than that of the outlet side, which achieves the purpose of pressurization to a certain extent.

[0031] Embodiment 3, a filtering device suitable for purifying dry gas sealing gas, based on embodiment 1: The support part and the dust removal chamber are installed in a manner that a T-shaped protrusion 66 is provided on the outer wall of the support part, and a T-shaped anti-slip groove 67 is provided on the inner wall of the dust removal chamber to match the T-shaped protrusion. The support part is installed on the inner wall of the dust removal chamber by embedding the T-shaped protrusion into the T-shaped anti-slip groove, so that the support part is axially fixed and easy to install and disassemble in the radial direction.

[0032] There is a gap between the T-shaped protrusion and the anti-slip groove in the radial direction, and the gap is at the micron level.

[0033] The dust filter is fixed to the support part in such a way that an annular step is provided inside the support part, an outer edge matching the annular step is provided outside the dust filter, and the outer edge is fixed to the annular step by screws.

[0034] The dust filter is a dust removal wire mesh and is electrostatically charged. The dust particles in the sealed gas are filtered to the maximum extent by utilizing the attraction of static electricity on the dust particles. Within a predetermined time, the static electricity in the dust removal wire mesh is removed by power failure, and the accumulated dust particles fall into the dust collection box under the action of gravity, and the dust is discharged to the outside through the pumping plate.

[0035] An annular groove is formed on the annular step, and a filler 65 is filled in the annular groove. The filler is a sealing material.

[0036] Embodiment 4, a filtering device suitable for purifying dry gas sealing gas, based on embodiment 1: The water absorption column is in the shape of a cube. The cube shape can achieve circumferential fixation to avoid rotation during the water removal process, which affects the water removal efficiency. The water absorption column is made of stainless steel.

[0037] The water absorption columns are fixedly arranged on a disc-shaped water absorption plate, the inner wall of the water absorption cavity is provided with an inwardly concave annular step, and the water absorption plate is embedded in the inner wall of the water absorption cavity through the step.

[0038] The water-absorbing particles are spherical water-absorbing particles, and the material thereof is a water-absorbing resin material.

[0039] The observation window is provided with square rubber gaskets around it and fixed by screws. The observation window is tempered glass. The square rubber gasket can prevent secondary leakage of the sealed gas. The tempered glass can prevent the observation window from being broken due to the impact of the sealed gas pressure, thereby preventing safety accidents.

[0040] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filtering device for purifying dry gas sealing gas, comprising a filtering cavity, wherein an inlet side pressing end cap (22) and an outlet side pressing end cap (21) are respectively fixedly connected at both ends of the filtering cavity, wherein: The filter chamber is a graded filter chamber, which is provided with a dust removal chamber, a water absorption chamber (5) and an acid-base impurity removal chamber (4) in sequence from the inlet to the outlet; the inlet side pressing end cover, the dust removal chamber, the water absorption chamber, the acid-base impurity removal chamber and the outlet side pressing end cover are provided with a plurality of sets of screw holes corresponding to each other around them, and are fixed by bolts; the dust removal chamber (6) is provided with an annular support portion (62) on its inner wall, a dust removal filter (61) is fixed on the inner side of the support portion, a channel is opened under the dust removal chamber, and A dust collecting box (63) is provided below the passage, and a removable draw plate (64) is provided at the bottom or side of the dust collecting box; the water absorption cavity (5) has a plurality of water absorption columns (52) arranged therein, a plurality of holes are provided in the water absorption columns, the holes are filled with water absorption particles (53), and a partition net (51) is fixed to the end surface of the water absorption column; the acid and alkali impurity removal cavity (4) includes an acid removal cavity (42) and an alkali removal cavity (41) therein, and the side wall of the acid removal cavity is provided with acid absorption paper, and the side wall of the alkali removal cavity is provided with alkali absorption paper.

2. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The acid-base impurity removal chamber has a test chamber (43) on its outer wall. The test chamber is connected to the interior of the acid-base impurity removal chamber via a medium flow channel (44). Acid-base test paper is provided in the test chamber. A transparent observation window (3) is provided on the test chamber.

3. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The dust removal chamber, the water absorption chamber and the acid and alkali impurity removal chamber are in contact with each other via a gasket (7); the acid and alkali impurity removal chamber, the water absorption chamber and the outlet side pressing end cover are surrounded by second bolt holes (23) and are connected via long bolts (11), and the acid and alkali impurity removal chamber and the outlet side pressing end cover have a clearance fit; the water absorption chamber, the dust removal chamber and the inlet side pressing end cover are surrounded by first bolt holes (68) and are connected via short bolts (12).

4. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The inlet side compression end cover and the outlet side compression end cover adopt a stepped interface, and the inlet side interface size is larger than the outlet side interface.

5. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The support portion and the dust removal chamber are installed in such a manner that a T-shaped protrusion (66) is provided on the outer wall of the support portion, and a T-shaped anti-slip groove (67) matching the protrusion is provided on the inner wall of the dust removal chamber.

6. A filtering device for purifying dry gas sealing gas according to claim 5, characterized in that: There is a gap between the T-shaped protrusion and the anti-slip groove in the radial direction, and the gap is at the micron level.

7. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The dust filter is fixed to the support part in that an annular step is provided on the inner side of the support part, an outer edge matching the annular step is provided on the outer side of the dust filter, and the outer edge is fixed to the annular step by screws; the interface between the annular step and the outer edge is filled with filler.

8. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The dust removal filter is a dust removal wire mesh and is electrostatically charged.

9. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The water absorption column is in the shape of a cube.

10. A filtering device for purifying dry gas sealing gas according to claim 1, characterized in that: The water absorption columns are fixedly arranged on a disc-shaped water absorption plate, the inner wall of the water absorption cavity is provided with an inwardly concave annular step, and the water absorption plate is embedded in the inner wall of the water absorption cavity through the step.

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