Filter for a cryogenic system

Abstract

The utility model provides a filter for low temperature system, including filter shell, the vertical filter cavity that is provided with in filter shell, the filter cavity is provided with the filter cartridge of coaxial line, the filter shell in filter cartridge upper end, the bottom of filter cavity is provided with detachable end cover subassembly, and end cover subassembly includes cylinder, the top ring is provided with in the upper end of cylinder, and the bottom ring is provided with in lower extreme, and the upper end of filter cartridge and top ring sealed abut, and the lower end of top ring and lower sealing plate sealed abut, and the bottom ring is provided with compression spring between lower sealing plate, and the lower end of axle rod is fixed with in lower sealing plate, and the lower end of axle rod passes bottom ring, and the upper end of axle rod is located above import, and fixed with upper sealing plate, and axle rod moves down, drives upper sealing plate and closes import. The utility model discloses when back flushing, can directly close the import of filter cartridge, avoids back flushing medium and drives the impurity into feed inlet, and the impurity particle is left at the feed inlet, and simultaneously will not appear the situation such as the forgetful closing of blow-off.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and in particular to a filter for cryogenic systems. Background Technology

[0002] In existing filters, backwashing is usually performed by closing the control valve on the filter feed pipe and opening the drain valve at the drain outlet. However, the backwashing medium can easily carry impurity particles that remain in the feed pipe. Furthermore, the opening and closing of the feed pipe and the drain outlet need to be operated separately, which can easily lead to situations where the drain outlet is forgotten to be closed after backwashing. Utility Model Content

[0003] This utility model proposes a filter for a cryogenic system. During backflushing, the inlet of the filter cartridge can be directly closed to prevent the backflushing medium from carrying impurities into the feed inlet and leaving impurity particles at the feed inlet; at the same time, it will not cause situations such as forgetting to close the drain outlet.

[0004] The technical solution of this utility model is implemented as follows: A filter for a low-temperature system includes a filter shell, a vertical filter chamber is provided inside the filter shell, a coaxial filter cartridge is provided inside the filter chamber, an inlet is provided in the filter shell at the upper end of the filter cartridge, a detachable end cap assembly is provided at the bottom of the filter chamber, the end cap assembly includes a cylinder, a top ring is provided at the upper end of the cylinder, a bottom ring is provided at the lower end, the filter cartridge is sealed against the upper end of the top ring, the lower end of the top ring is sealed against the lower sealing plate, a compression spring is provided between the bottom ring and the lower sealing plate, a shaft is fixed on the lower sealing plate, the lower end of the shaft passes through the bottom ring, the upper end of the shaft is located above the inlet and is fixed with an upper sealing plate, the shaft moves down, causing the upper sealing plate to close the inlet.

[0005] Furthermore, a cleaning assembly is installed on the shaft for cleaning the inner wall of the filter cartridge. The cleaning assembly includes a vertical cleaning brush, one side of which abuts against the inner wall of the filter cartridge, and the other side is fixedly connected to the shaft via a connecting rod. Because the cleaning assembly is connected to the shaft, rotating the shaft synchronously drives the cleaning assembly to perform cleaning, causing impurities adhering to the inner wall of the filter cartridge to fall to the bottom of the filter cartridge, reducing the frequency of backwashing.

[0006] Furthermore, the upper end of the lower sealing plate has a conical protrusion that abuts against the inner hole of the top ring. The seal is achieved through this conical protrusion.

[0007] Furthermore, the upper end of the top ring is provided with a lower annular step, and the lower end of the filter cartridge is sealed against the lower annular step.

[0008] Furthermore, an upper annular step is provided at the inlet, and the top of the filter cartridge is sealed against the upper annular step.

[0009] Furthermore, the lower end of the upper sealing plate is a tapered end, and the shaft moves down, causing the tapered end to close the inlet.

[0010] Furthermore, one end of the filter shell is provided with a feed inlet and the other end is provided with a discharge outlet. The inlet and the feed inlet are connected, and the discharge outlet is connected to the side wall of the filter chamber.

[0011] The beneficial effects of this utility model are: When the filter needs backflushing, this utility model closes the filter cartridge inlet by pulling down the shaft rod, while simultaneously moving the lower sealing plate away from the top ring, opening the inner hole of the top ring. The inner hole of the top ring serves as a drain port. This structure prevents the backflushing medium from carrying impurities into the feed inlet, leaving impurity particles at the feed inlet. Moreover, the inlet can be closed and the drain port opened in one step, making the operation simple and convenient. After backflushing is completed, the shaft rod can be released to close the drain port and open the inlet, preventing situations such as forgetting to close the drain port. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of Example 1; Figure 2 This is a schematic diagram of the structure of Example 2.

[0014] Filter housing 1, feed inlet 2, discharge outlet 3, filter chamber 4, filter cylinder 5, inlet 6, upper annular step 7, cylinder body 8, top ring 9, bottom ring 10, lower annular step 11, lower sealing plate 12, compression spring 13, shaft 14, upper sealing plate 15, vertical cleaning brush 16, connecting rod 17. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1 like Figure 1As shown, a filter for a cryogenic system includes a filter housing 1, with an inlet 2 at one end and an outlet 3 at the other end. A vertical filter chamber 4 is located inside the filter housing 1, and a coaxial filter cartridge 5 is installed within the filter chamber 4. An inlet 6 is located inside the filter housing 1 at the upper end of the filter cartridge 5, and an upper annular step 7 is provided at the inlet 6. A sealing gasket is fixed inside the upper annular step 7. The top of the filter cartridge 5 is sealed against the upper annular step 7. The inlet 6 communicates with the inlet 2, and the outlet 3 communicates with the side wall of the filter chamber 4. The filter medium enters the filter cartridge 5 through the inlet 2 and inlet 6, is filtered, enters the filter chamber 4, and is finally discharged through the outlet 3.

[0017] The bottom of the filter chamber 4 is provided with a detachable end cap assembly, which includes a cylinder 8. A top ring 9 is welded and fixed to the upper end of the cylinder 8, and a bottom ring 10 is welded and fixed to the lower end. The cylinder 8 and the filter shell 1 are fixedly connected by flange bolts. A lower annular step 11 is provided at the upper end of the top ring 9. A sealing gasket is fixed inside the lower annular step 11, and the lower end of the filter cylinder 5 is sealed against the lower annular step 11.

[0018] A lower sealing plate 12 is provided at the lower end of the top ring 9. The upper end of the lower sealing plate 12 is a conical protrusion that seals against the inner hole of the top ring 9. A compression spring 13 is provided between the bottom ring 10 and the lower sealing plate 12. The upper end of the compression spring 13 abuts against the lower sealing plate 12, and the lower end of the compression spring 13 abuts against the bottom ring 10.

[0019] A shaft 14 is fixed on the lower sealing plate 12. The lower end of the shaft 14 passes through the bottom ring 10, and the upper end of the shaft 14 passes through the filter cylinder 5 and is located above the inlet 6. An upper sealing plate 15 is fixed to the upper end of the shaft 14. The lower end of the upper sealing plate 15 is a tapered end. When the shaft 14 moves down, it causes the tapered end to close the inlet 6.

[0020] The method of using the filter: When the filter cartridge 5 is clogged and backflushing is required, pull down the shaft 14, compress the compression spring 13, close the inlet 6 with the upper sealing plate 15, and move the lower sealing plate 12 away from the inner hole of the top ring 9. The backflushing medium is introduced through the discharge port 3. The backflushing medium enters the filter cartridge 5 and enters the filter cartridge 5 in the reverse direction, driving the impurities in the filter cartridge 5 to be discharged through the inner hole of the top ring 9.

[0021] Example 2 This embodiment is basically the same as Embodiment 1, except that, as Figure 2 As shown, a cleaning assembly is provided on the shaft 14 for cleaning the inner wall of the filter cartridge 5. The cleaning assembly includes a vertical cleaning brush 16, one side of which is fixed with soft bristles that abut against the inner wall of the filter cartridge 5, and the other side is fixedly connected to the shaft 14 via a connecting rod 17.

[0022] In daily use, the shaft 14 can be rotated, which drives the vertical cleaning brush 16 to rotate and clean the inner wall of the cylinder 8. The cleaned impurities fall into the bottom of the filter cartridge 5, reducing the frequency of backwashing. When the shaft 14 moves down, the vertical cleaning brush can move down synchronously with the shaft 14.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A filter for a cryogenic system, comprising a filter housing, a vertically oriented filter chamber disposed within the filter housing, a coaxial filter cartridge disposed within the filter chamber, an inlet disposed within the filter housing at the upper end of the filter cartridge, and a detachable end cap assembly disposed at the bottom of the filter chamber, characterized in that: The end cap assembly includes a cylinder with a top ring at the upper end and a bottom ring at the lower end. The filter cylinder is sealed against the upper end of the top ring, and the lower end of the top ring is sealed against the lower sealing plate. A compression spring is provided between the bottom ring and the lower sealing plate. A shaft is fixed on the lower sealing plate, with the lower end of the shaft passing through the bottom ring and the upper end of the shaft located above the inlet and fixed with an upper sealing plate. When the shaft moves down, it causes the upper sealing plate to close the inlet.

2. A filter for a cryogenic system according to claim 1, characterized in that: A cleaning assembly is provided on the shaft. The cleaning assembly includes a vertical cleaning brush. One side of the vertical cleaning brush abuts against the inner wall of the filter cartridge, and the other side is fixedly connected to the shaft via a connecting rod.

3. A filter for a cryogenic system according to claim 1 or 2, characterized in that: The upper end of the lower sealing plate is a conical protrusion that seals against the inner hole of the top ring.

4. A filter for a cryogenic system according to claim 1, characterized in that: The upper end of the top ring is provided with a lower annular step, and the lower end of the filter cartridge is sealed against the lower annular step.

5. A filter for a cryogenic system according to claim 1, characterized in that: An upper annular step is provided at the inlet, and the top of the filter cartridge is sealed against the upper annular step.

6. A filter for a cryogenic system according to claim 1 or 5, characterized in that: The lower end of the upper sealing plate is tapered. The shaft moves down, causing the tapered end to close the inlet.

7. A filter for a cryogenic system according to claim 1, characterized in that: The filter housing has an inlet at one end and an outlet at the other end. The inlet and the outlet are connected, and the outlet is connected to the side wall of the filter chamber.

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