Compressed air spring anti-freezing filter structure

Abstract

The utility model discloses an anti-freezing filter structure of a compressed air spring, relates to the technical field of filters, and solves the technical problem that a shell is damaged due to icing and expansion of water in a filter in a low-temperature environment in winter, so that the water leakage phenomenon occurs. Comprising a filter shell, a filter base installed at the top end of the filter shell and a filter element installed in the filter shell, a piston piece matched with the filter shell is arranged below the filter element, and an inner cavity of the filter shell is sequentially divided into a filter cavity and a compressed air cavity from top to bottom through the piston piece; an inflating mechanism for inflating the compressed air cavity is mounted at the bottom of the piston piece; the inflation mechanism comprises a pull rod, an air guide channel and an inflation nozzle assembly. The compressed air cavity is formed in the filter shell, so that water in the filter can adaptively push the piston piece to move downwards after being frozen and expanded, the space of the filter cavity in the filter is adaptively enlarged, and the problem that the filter is frozen and damaged at low temperature is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of filters, specifically the anti-freezing filter structure of a compressed air spring. Background Art

[0002] A filter is a device used to remove impurities in a fluid. It blocks, adsorbs or separates suspended solids, particulate matter, bacteria, chemical substances, etc. in the fluid through a specific filter medium, thereby improving the purity of the fluid or meeting specific process requirements. Filters are widely used in many fields such as industry, agriculture, domestic water treatment, medicine, food, and chemical industry.

[0003] The existing filters and pre-filters sold in the market mainly consist of a filter seat, a filter element, a filter housing, etc. When water flows into the filter housing through the water inlet, it is filtered and purified by the filter element and then flows out through the water outlet for use. However, in winter when the ambient temperature is below 0 degrees Celsius, the water in the filter housing will freeze into ice. As water expands when it freezes, it will damage or break the filter housing, resulting in filter damage and water leakage. Content of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an anti-freezing filter structure of a compressed air spring, which solves the problem that in a low-temperature environment in winter, the water in the filter freezes and expands, damaging the housing and causing water leakage.

[0005] To achieve the above object, according to an embodiment of the first aspect of the utility model, an anti-freezing filter structure of a compressed air spring is provided, including a filter housing, a filter seat installed at the top of the filter housing, and a filter element installed in the filter housing. A piston member matching the filter housing is provided below the filter element. The piston member divides the inner cavity of the filter housing into a filtering cavity and a compressed air cavity from top to bottom in sequence. An inflation mechanism for inflating the compressed air cavity is installed at the bottom of the piston member;

[0006] The inflation mechanism includes a pull rod, a gas guiding channel, and an inflation nozzle assembly. The top of the pull rod is connected to the bottom of the piston member. A through hole for the bottom end of the pull rod to extend out is opened at the bottom of the filter housing, and a limit sealing assembly is installed between the pull rod and the through hole. The gas guiding channel is arranged in the pull rod. The inflation nozzle assembly is installed at the bottom end of the pull rod, and the inflation nozzle assembly is used to introduce gas into the gas guiding channel. One end of the gas guiding channel far away from the inflation nozzle assembly is communicated with the compressed air cavity.

[0007] As a further solution of the present utility model: The limit sealing assembly includes a limit disk fixedly sleeved on the rod wall at the bottom end of the pull rod. A circular notch communicating with the through hole is provided at the bottom of the filter housing, and a matching first sealing ring is installed in the circular notch. Above the limit disk, there is a sealing ring pressing plate for pressing the first sealing ring, and the pull rod is slidably connected to the sealing ring pressing plate.

[0008] As a further solution of the present utility model: The sealing ring pressing plate is of a circular structure. The outer diameter of the sealing ring pressing plate is larger than that of the limit disk, and the outer ring of the sealing ring pressing plate is fixedly connected to a cylinder installed at the bottom end of the filter housing. The inflation nozzle assembly is arranged inside the cylinder.

[0009] As a further solution of the present utility model: The piston member includes an annular enclosure, an annular sealing plate, a column, and a plurality of second sealing rings. An annular groove for installing the second sealing ring is formed on the outer side wall of the outer ring of the annular enclosure. The outer ring of the annular sealing plate is fixedly connected to the inner ring of the annular enclosure. The column is inlaid and installed at the center of the annular sealing plate, and the column is connected to the pull rod.

[0010] As a further solution of the present utility model: A groove for inserting the pull rod is formed at the bottom end of the column. The pull rod is composed of an upper rod and a lower rod connected coaxially. The upper rod extends into the groove, and the upper rod is fixedly bonded to the groove wall with glue.

[0011] As a further solution of the present utility model: A plurality of upper reinforcing ribs and lower reinforcing ribs evenly distributed in a ring shape are respectively installed on the side walls of the column near the top end and the bottom end. The upper reinforcing ribs and the lower reinforcing ribs are both connected between the column and the annular enclosure, and the bottom of the upper reinforcing ribs and the top of the lower reinforcing ribs are respectively connected to the top and the bottom of the annular sealing plate.

[0012] As a further solution of the present utility model: The filter base includes an end cover and a water guide cylinder installed on the top of the end cover. The end cover is installed at the top end of the filter housing. A partition member is installed inside the water guide cylinder. The partition member divides the inner cavity of the water guide cylinder into a water inlet channel and a water outlet channel. A water dropping port communicating with the filter cavity is formed at the bottom of the water inlet channel, and a socket connected to the filter element is communicated and arranged at the bottom of the water outlet channel.

[0013] As a further solution of the present utility model: The end cover is threadedly connected to the filter housing, and a third sealing ring is installed at the connection between the end cover and the filter housing. A fourth sealing ring is installed at the connection between the filter element and the socket.

[0014] As a further solution of the present utility model: A plurality of outer rib strips connected to the bottom end of the filter housing are evenly arranged on the outer cylindrical wall of the cylinder body. The plurality of outer rib strips are commonly connected to an outer ring body installed at the bottom end of the filter housing. An inner ring body through which a pull rod passes is installed on the lower surface inside the filter housing. A plurality of evenly distributed inner rib strips are installed between the outer circumference of the inner ring body and the inner wall of the filter housing.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. In the present utility model, by arranging a piston member below the filter element, it is convenient to divide the inner cavity of the filter housing into a filtration chamber and a compressed air chamber. The inflation nozzle assembly and the air guide channel are used to conveniently inject compressed air with a pressure greater than the water pressure in the filtration chamber into the compressed air chamber. When the water in the filtration chamber freezes and expands in a low-temperature environment, it can adaptively push down the piston member, so that the volume of the filtration chamber increases adaptively, thereby avoiding the filter housing from being burst and effectively solving the problem of the filter being damaged by freezing at low temperatures.

[0017] 2. In the present utility model, through the limit sealing assembly, it is not only convenient to limit the maximum rising distance of the piston member, but also can effectively ensure the sealing performance at the connection between the pull rod and the bottom end of the filter housing, so that the air filled in the compressed air chamber will not leak. Description of the Drawings

[0018] Figure 1 is a perspective view of the structure of the compressed air spring anti-freeze filter of the present utility model from the first perspective;

[0019] Figure 2 is a perspective view of the structure of the compressed air spring anti-freeze filter of the present utility model from the second perspective;

[0020] Figure 3 is a cross-sectional view of the structure of the compressed air spring anti-freeze filter of the present utility model when the volume of the compressed air chamber is the largest;

[0021] Figure 4 is a cross-sectional view of the structure of the compressed air spring anti-freeze filter of the present utility model when the volume of the compressed air chamber is the smallest;

[0022] Figure 5 is a perspective view of the connection part between the piston member and the inflation mechanism in the structure of the compressed air spring anti-freeze filter of the present utility model;

[0023] Figure 6 is a cross-sectional view of the connection part between the piston member and the inflation mechanism in the structure of the compressed air spring anti-freeze filter of the present utility model;

[0024] Figure 7 is a perspective view of the inflation mechanism in the structure of the compressed air spring anti-freeze filter of the present utility model;

[0025] Figure 8 This is a three-dimensional view of the filter seat in the anti-freezing filter structure of the compressed air spring of the present utility model.

[0026] In the figure: 1. Filter housing; 2. Filter seat; 201. End cover; 202. Water guide cylinder; 3. Filter element; 4. Piston part; 401. Annular enclosure; 402. Annular sealing plate; 403. Column; 404. Second sealing ring; 5. Filter chamber; 6. Compressed air chamber; 7. Inflation mechanism; 701. Pull rod; 7011. Upper rod; 7012. Lower rod; 702. Air guide channel; 703. Inflation nozzle assembly; 8. Limit disc; 9. First sealing ring; 10. Sealing ring pressing plate; 11. Cylinder body; 12. Upper reinforcing rib; 13. Lower reinforcing rib; 14. Partition piece; 15. Water inlet channel; 16. Water outlet channel; 17. Outer rib; 18. Outer ring body; 19. Inner ring body; 20. Inner rib; 21. Socket. Detailed implementation manners

[0027] Next, the technical solutions of the present utility model will be described clearly and completely in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] As Figure 1-8 shown, the anti-freezing filter structure of the compressed air spring includes a filter housing 1, a filter seat 2 installed at the top end of the filter housing 1, and a filter element 3 installed in the filter housing 1. The filter seat 2 includes an end cover 201 and a water guide cylinder 202 installed on the top of the end cover 201. The end cover 201 is installed at the top end of the filter housing 1, and the end cover 201 is threadedly connected to the filter housing 1. A third sealing ring is installed at the connection between the end cover 201 and the filter housing 1. A partition piece 14 is installed in the water guide cylinder 202. The partition piece 14 divides the inner cavity of the water guide cylinder 202 into a water inlet channel 15 and a water outlet channel 16. A water dropping port communicating with the filter chamber 5 is opened at the bottom of the water inlet channel 15. A socket 21 connected to the filter element 3 is communicated and arranged at the bottom of the water outlet channel 16. A fourth sealing ring is installed at the butt joint between the filter element 3 and the socket 21.

[0029] Below the filter element 3, there is a piston part 4 matching the filter housing 1. The piston part 4 includes an annular enclosure 401, an annular sealing plate 402, a column 403 and a plurality of second sealing rings 404. An annular groove for installing the second sealing ring 404 is opened on the outer side wall of the outer circle of the annular enclosure 401. In this embodiment, the number of the second sealing rings 404 is three, which is beneficial to ensuring the sealing performance between the piston part 4 and the inner wall of the filter housing 1. The outer circle of the annular sealing plate 402 is fixedly connected to the inner circle of the annular enclosure 401;

[0030] The column 403 is embedded and installed at the center of the annular sealing plate 402. In order to improve the structural strength of the piston member 4, in this embodiment, a plurality of upper reinforcing ribs 12 and lower reinforcing ribs 13 that are evenly distributed in a ring shape are respectively installed on the side walls of the column 403 near the top and bottom. The upper reinforcing ribs 12 and the lower reinforcing ribs 13 are both connected between the column 403 and the annular enclosure 401, and the bottom of the upper reinforcing rib 12 and the top of the lower reinforcing rib 13 are respectively connected to the top and bottom of the annular sealing plate 402.

[0031] The piston member 4 divides the inner cavity of the filter housing 1 into a filtering chamber 5 and a compressed air chamber 6 from top to bottom in sequence. An air inflation mechanism 7 for inflating the compressed air chamber 6 is installed at the bottom of the piston member 4. The air inflation mechanism 7 includes a pull rod 701, a gas guiding channel 702, and an air inflation nozzle assembly 703. The top end of the pull rod 701 is connected to the bottom of the piston member 4. A groove for inserting the pull rod 701 is provided at the bottom end of the column 403. The pull rod 701 is composed of an upper rod segment 7011 and a lower rod segment 7012 that are coaxially connected. The cross-section of the upper rod segment 7011 is smaller than that of the lower rod segment 7012. The upper rod segment 7011 extends into the groove, and the upper rod segment 7011 is fixedly bonded to the groove wall through glue.

[0032] A through hole for the bottom end of the pull rod 701 to extend out is provided at the bottom of the filter housing 1, and a limit sealing assembly is installed between the pull rod 701 and the through hole. The limit sealing assembly includes a limit disk 8 fixedly sleeved on the rod wall at the bottom end of the pull rod 701, which is convenient for limiting the maximum rising distance of the pull rod 701. An annular notch communicated with the through hole is provided at the bottom of the filter housing 1, and a matching first sealing ring 9 is installed in the annular notch. A sealing ring pressing plate 10 for pressing the first sealing ring 9 is arranged above the limit disk 8 to ensure the sealing effect, and the pull rod 701 is slidably connected with the sealing ring pressing plate 10.

[0033] The gas guiding channel 702 is arranged in the pull rod 701. In this embodiment, the gas guiding channel 702 is composed of a longitudinally connected channel and a transversely connected channel. The air inflation nozzle assembly 703 is installed at the bottom end of the pull rod 701. In this embodiment, the air inflation nozzle assembly 703 can be an air inflation nozzle with a valve, which is convenient for inflating with an external air inflation device. The air inflation nozzle assembly 703 is used to introduce gas into the gas guiding channel 702, and the end of the gas guiding channel 702 far from the air inflation nozzle assembly 703 is communicated with the compressed air chamber 6, which is convenient for injecting compressed air with a pressure greater than the water pressure in the filtering chamber 5 into the compressed air chamber 6.

[0034] In order to improve the installation stability of the sealing ring pressing plate 10, in this embodiment, the sealing ring pressing plate 10 is of an annular structure, the outer diameter of the sealing ring pressing plate 10 is larger than the outer diameter of the limiting disk 8, and an outer ring 11 installed at the bottom end of the filter housing 1 is fixedly connected to the outer ring of the sealing ring pressing plate 10. The cylinder 11 can facilitate the positioning and installation of the sealing ring pressing plate 10, and the inflation nozzle assembly 703 is arranged inside the cylinder 11 to facilitate the enclosure and protection of the inflation nozzle assembly 703.

[0035] In order to improve the compressive strength of the compressed air chamber 6, in this embodiment, a plurality of outer rib strips 17 connected to the bottom end of the filter housing 1 are uniformly arranged on the outer cylindrical wall of the cylinder 11. The plurality of outer rib strips 17 are jointly connected to an outer ring body 18 installed at the bottom end of the filter housing 1. An inner ring body 19 through which the pull rod 701 passes is installed on the lower surface inside the filter housing 1. A plurality of evenly distributed inner rib strips 20 are installed between the outer ring of the inner ring body 19 and the inner wall of the filter housing 1. When all the water in the filter chamber 5 freezes, it will push the piston member 4 to move down to the lowest end. There is still enough space in the compressed air chamber 6 in this state, and the air pressure in the compressed air chamber 6 is still within the pressure-bearing range of the filter housing 1 at this time, thereby ensuring that the filter housing 1 will not be frozen and damaged.

[0036] The working principle of the present utility model: Place the piston member 4 into the filter housing 1, evenly apply glue to the upper section rod 7011 of the pull rod 701, and insert the pull rod 701 through the through hole at the bottom end of the filter housing 1 so that the upper section rod 7011 is butted against the groove at the bottom end of the column 403, then the connection between the pull rod 701 and the piston member 4 can be completed. Then, dock and install the filter element 3 with the filter seat 2, and install the filter seat 2 at the top end of the filter housing 1 to complete the assembly of the filter. Use an external inflation device to inflate the inflation nozzle assembly 703, and cooperate with the air guiding channel 702 to introduce the compressed air into the compressed air chamber 6 until the pull rod 701 drives the limiting disk 8 to rise and fit with the sealing ring pressing plate 10. At this time, the volume of the compressed air chamber 6 is the largest, and the air pressure in the compressed air chamber 6 is greater than the water pressure in the filter chamber 5. When the ambient temperature in winter is below 0 °C, the water temperature inside the filter housing 1 will also decrease accordingly, and the freezing process will occur gradually from the outside to the inside and from top to bottom. The ice first blocks the water inlet and outlet channels 16. At this time, a closed space is formed inside the filter. As the water inside the filter gradually freezes and its volume increases, since the water inlet channel 15 and the water outlet channel 16 are blocked by ice, the internal pressure gradually rises. When the pressure is greater than the pressure in the compressed air chamber 6, it pushes the piston member 4 to move down, so that the volume of the filter chamber 5 adaptsively increases. Until all the water inside the filter freezes and expands to the maximum state, there is still enough space in the compressed air chamber 6, and the air pressure in the compressed air chamber 6 is still within the pressure-bearing range of the filter housing 1 at this time, thereby ensuring that the filter housing 1 will not be frozen and damaged, thus completely solving the problem of the filter being frozen and damaged at low temperature.

[0037] The above embodiments are only used to illustrate the technical method of the present utility model rather than to limit it. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present utility model.

Claims

1. Compressed air spring anti-freeze filter structure, including a filter housing (1), a filter seat (2) installed at the top of the filter housing (1), and a filter element (3) installed inside the filter housing (1), characterized in that, Below the filter element (3), there is a piston part (4) that matches the filter housing (1). The piston part (4) divides the inner cavity of the filter housing (1) into a filter cavity (5) and a compressed air cavity (6) from top to bottom in sequence. An inflation mechanism (7) for inflating the compressed air cavity (6) is installed at the bottom of the piston part (4). The inflation mechanism (7) includes a pull rod (701), a gas guide channel (702), and an inflation nozzle assembly (703). The top end of the pull rod (701) is connected to the bottom of the piston part (4). A through hole for the bottom end of the pull rod (701) to extend out is opened at the bottom of the filter housing (1), and a limit and seal assembly is installed between the pull rod (701) and the through hole. The gas guide channel (702) is arranged inside the pull rod (701). The inflation nozzle assembly (703) is installed at the bottom end of the pull rod (701), and the inflation nozzle assembly (703) is used to introduce gas into the gas guide channel (702). The end of the gas guide channel (702) far from the inflation nozzle assembly (703) is communicated with the compressed air cavity (6).

2. The anti-freezing filter structure of the compressed air spring according to claim 1, characterized in that, The limit and seal assembly includes a limit disc (8) fixedly sleeved on the rod wall at the bottom end of the pull rod (701). A circular notch communicated with the through hole is arranged at the bottom of the filter housing (1), and a matching first sealing ring (9) is installed in the circular notch. Above the limit disc (8), there is a sealing ring pressing plate (10) for pressing the first sealing ring (9). The pull rod (701) is slidably connected with the sealing ring pressing plate (10).

3. The anti-freezing filter structure of the compressed air spring according to claim 2, wherein, The sealing ring pressing plate (10) is of a circular structure. The outer diameter of the sealing ring pressing plate (10) is larger than the outer diameter of the limit disc (8), and the outer ring of the sealing ring pressing plate (10) is fixedly connected with a cylinder body (11) installed at the bottom end of the filter housing (1). The inflation nozzle assembly (703) is arranged inside the cylinder body (11).

4. The anti-freezing filter structure of the compressed air spring according to claim 1, characterized in that The piston part (4) includes an annular enclosure (401), an annular sealing plate (402), a column (403), and a plurality of second sealing rings (404). An annular groove for installing the second sealing ring (404) is opened on the outer side wall of the outer ring of the annular enclosure (401). The outer ring of the annular sealing plate (402) is fixedly connected with the inner ring of the annular enclosure (401). The column (403) is inlaid and installed at the center of the annular sealing plate (402), and the column (403) is connected with the pull rod (701).

5. The anti-freezing filter structure of the compressed air spring according to claim 4, characterized in that, A groove for inserting the pull rod (701) is opened at the bottom end of the column (403). The pull rod (701) is composed of an upper section rod (7011) and a lower section rod (7012) connected coaxially. The upper section rod (7011) extends into the groove, and the upper section rod (7011) is fixedly bonded to the groove wall through glue.

6. The anti-freezing filter structure of the compressed air spring according to claim 4, characterized in that, A plurality of upper reinforcing ribs (12) and lower reinforcing ribs (13) which are evenly distributed in a ring shape are respectively installed on the side walls of the column (403) near the top and the bottom. The upper reinforcing ribs (12) and the lower reinforcing ribs (13) are both connected between the column (403) and the annular enclosure (401), and the bottom of the upper reinforcing ribs (12) and the top of the lower reinforcing ribs (13) are respectively connected to the top and the bottom of the annular sealing plate (402).

7. The anti-freezing filter structure of the compressed air spring according to claim 1, characterized in that, The filter seat (2) includes an end cover (201) and a water guide cylinder (202) installed on the top of the end cover (201). The end cover (201) is installed at the top end of the filter housing (1). A partition member (14) is installed in the water guide cylinder (202). The partition member (14) divides the inner cavity of the water guide cylinder (202) into a water inlet channel (15) and a water outlet channel (16). A water falling port communicating with the filter cavity (5) is opened at the bottom of the water inlet channel (15). A socket (21) connected to the filter element (3) is communicated and arranged at the bottom of the water outlet channel (16).

8. The anti-freezing filter structure of the compressed air spring according to claim 7, characterized in that, The end cover (201) is threadedly connected to the filter housing (1), and a third sealing ring is installed at the connection between the end cover (201) and the filter housing (1). A fourth sealing ring is installed at the connection between the filter element (3) and the socket (21).

9. The anti-freezing filter structure of the compressed air spring according to claim 3, characterized in that, A plurality of outer rib strips (17) connected to the bottom end of the filter housing (1) are evenly arranged on the outer cylinder wall of the cylinder body (11). The plurality of outer rib strips (17) are jointly connected to an outer ring body (18) installed at the bottom end of the filter housing (1). An inner ring body (19) through which a pull rod (701) passes is installed on the lower surface inside the filter housing (1). A plurality of evenly distributed inner rib strips (20) are installed between the outer ring of the inner ring body (19) and the inner wall of the filter housing (1).

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