Anti-freezing filter element assembly and pre-filter thereof

Abstract

The anti-freezing filter element assembly comprises a filter element and an anti-freezing assembly arranged below the filter element, the anti-freezing assembly comprises a shell and an elastic sealing piece, and the elastic sealing piece is arranged in the shell and moves downwards to be opened under the ice expansion pressure when water becomes ice or recovers to be closed when the ice becomes water. According to the utility model, the anti-freezing component is arranged in the filter element, so that the pressure of the machine head and the filter bottle is reduced after water is condensed into ice, the filter bottle and the machine head are protected, and the risk of water leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to water purification equipment technical field especially is related to an anti-freezing filter element assembly and its prefilter. BACKGROUND

[0002] Now many families have installed prefilter, but the main body structure of prefilter is mainly injection molding part, the activity of material molecular chain reduces under low temperature state, tenacity drops, and the water in prefilter will freeze into ice due to low temperature environment, the volume of water freezing into ice will expand 1.09 times, the space in prefilter is insufficient, and 1L water freezes into ice and generates 198mpa pressure, the filter bottle and head of prefilter adopt threaded connection, the volume of water freezing into ice expands and the pressure is very big, the stress of root of thread concentrates, cracking generally occurs at the root of thread, resulting in filter bottle or head damage and water leakage.

[0003] Part of filter bottle adopts elastic material, the filter bottle expands after freezing for many times, the filter core structure in filter bottle is affected, resulting in prefilter effect being poor or invalid. INVENTION CONTENTS

[0004] The utility model discloses a kind of anti-freezing filter element assembly and its prefilter for solving above-mentioned technical problem, the utility model is by being provided with anti-freezing assembly in filter core, the pressure of head and filter bottle is reduced after water freezing into ice, filter bottle and head are protected, and the risk of water leakage is avoided.

[0005] The technical scheme that the utility model solves above-mentioned technical problem is as follows: an anti-freezing filter element assembly, including filter core, anti-freezing assembly arranged below filter core, anti-freezing assembly includes shell, elastic sealing element arranged in shell and moved downward to open when water freezes or restores to close when ice melts. Filter bottle outer wall contacts cold air first, temperature drops fastest, so water close to bottle wall reaches freezing point first, starts to freeze, gradually expands inward, when water in filter bottle outer wall starts to freeze into ice, due to limited space in filter bottle, ice expansion will exert pressure on piston, due to the fact that elastic sealing element is arranged in anti-freezing assembly, the force of elastic sealing element is far less than the pressure generated when water freezes into ice, elastic sealing element moves downward, water enters cavity in shell interior, water in anti-freezing assembly freezes into ice as temperature drops, piston moves to lower dead center;When ice melts, outer wall edge starts to melt first, central position melts later, ice in filter bottle melts into water and volume decreases, ice in anti-freezing assembly melts into water, elastic sealing element extrudes water to close anti-freezing assembly, the space left after passing through elastic sealing element of anti-freezing assembly realizes that the overall volume of filter bottle expands 0, during freezing process, the pressure received by filter bottle and head reduces, so that filter bottle and head are prevented from being damaged.

[0006] As preferred, the shell is provided with a tapered duct inserted into the filter core, the elastic sealing member is provided with a tapered portion, and the tapered portion is arranged in the tapered duct. Since the anti-freezing assembly has a large volume and is arranged at the bottom of the filter bottle, the bottle wall and the upper surface of the anti-freezing assembly will freeze first due to the position close to the bottle wall. If the pressure generated by the water freezing in the vertical pipe is used to push the small ice column downward, the small ice cone and the shell will be separated due to the pressure, a gap is formed, and the water flow can flow into the gap to push the elastic sealing member downward.

[0007] As preferred, the elastic sealing member comprises a piston and a spring arranged below the piston, the piston comprises a plug portion arranged in the shell and a tapered portion arranged in the tapered duct, the tapered portion is arranged above the plug portion, and the spring is arranged below the plug portion.

[0008] As preferred, the spring has a spring force smaller than the pressure generated by the water freezing into ice and a spring force greater than the pressure of the water at the upper end of the piston. The force of the spring is smaller than the pressure generated by the water freezing into ice, the piston moves downward, the spring is compressed, the water enters the accommodation space, the water in the anti-freezing assembly freezes into ice as the temperature decreases, and the piston moves to the cover ring to form a lower stop limit. The ice in the anti-freezing assembly melts into water, and since the spring force is greater than the pressure of the water at the upper end of the piston, the spring force pushes the water at the upper end of the piston out of the tapered portion and back into the filter bottle.

[0009] As preferred, the tapered portion comprises a dome and a plurality of inclined ribs arranged below the dome, a first groove is arranged on the dome, and a first sealing ring is arranged on the first groove. The first sealing ring is used to bear the water pressure during the normal operation of the pre-filter. Since F=ps, during the normal operation of the pre-filter, there is a certain change in the pressure p of the municipal water supply, the water pressure is different in different regions, the piston area s is reduced, and the space for the upward and downward movement of the piston during the normal operation is as small as possible to meet the requirement that the piston has enough movement space to give the expansion volume of the water freezing into ice during the freezing process. Since the pressure p varies in different regions and at different floors, reducing the surface area of the first layer of the piston can reduce the pressure, which is helpful to reduce the spring force and facilitate the installation and production of the spring. When the tapered portion moves downward, the ribs are arranged to facilitate the water flow to enter the accommodation space.

[0010] As preferred, a second groove is arranged on the plug portion, and a second sealing ring is arranged on the second groove. The second sealing ring is used to seal the space below the plug portion and in the shell to prevent the water flow from entering the space where the spring is arranged when the ice melts into water, which causes the spring to be inoperable.

[0011] As preferred, the elastic sealing member moves downward to form an accommodation space with the shell, and the elastic sealing member pushes the water in the accommodation space out when the ice melts into water.

[0012] As preferred, the end cover is arranged below the shell, the end cover comprises a cover bottom and a cover ring arranged on the cover bottom, the cover ring is arranged in the shell to limit the downward movement of the piston, and the spring is arranged on the cover bottom.

[0013] As preferred, the outer ring is arranged on the shell, the filter core is arranged in the outer ring, the filter core is provided with a center hole, and the tapered conduit is arranged in the middle part of the filter core through the center hole of the filter core.

[0014] The front filter comprises a head and a filter bottle connected with the head, and the filter bottle is provided with the anti-freezing filter core assembly.

[0015] The utility model has the advantages that: the space left by the elastic sealing element of the anti-freezing assembly is used to realize the expansion of the overall volume of the filter bottle, the pressure on the filter bottle and the head is reduced during the freezing process, and the filter bottle and the head are prevented from being damaged. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the structure schematic diagram of the normal working state of the utility model.

[0017] Figure 2 is Figure 1 is the sectional view along the direction of A-A.

[0018] Figure 3 is the structure schematic diagram of the water freezing state of the utility model.

[0019] Figure 4 is Figure 3 is the sectional view along the direction of B-B.

[0020] Figure 5 is the structure schematic diagram of the shell.

[0021] Figure 6 is the structure schematic diagram of the piston.

[0022] In the drawing: 1, filter core, 11, center hole, 2, shell, 21, tapered conduit, 22, outer ring, 3, piston, 31, plug part, 311, second groove, 32, tapered part, 321, dome, 3211, first groove, 322, convex rib, 4, spring, 5, end cover, 51, cover bottom, 52, cover ring, 6, containing space, 7, head, 8, filter bottle. DETAILED DESCRIPTION

[0023] The utility model is further described below in combination with the drawings and embodiments.

[0024] As Figures 1-6The utility model discloses an anti-freezing filter element assembly and prefilter thereof, including filter core 1, the anti-freezing assembly of being established below filter core 1, and the anti-freezing assembly includes shell 2, and the elastic sealing element of being established in shell 2 when water becomes ice under the ice expansion pressure and when ice melts water restores to close and moves down.

[0025] The shell 2 is provided with a conical guide pipe 21 inserted into the filter core 1, and the elastic sealing element is provided with a conical portion 32 arranged in the conical guide pipe 21.

[0026] The elastic sealing element comprises a piston 3 and a spring 4 arranged below the piston 3, the piston 3 comprises a plug portion 31 arranged in the shell 2 and a conical portion 32 arranged in the conical guide pipe 21, the conical portion 32 is arranged above the plug portion 31, and the spring 4 is arranged below the plug portion 31.

[0027] The spring 4 has a spring force smaller than the pressure of water condensing into ice and a spring force greater than the pressure of water at the upper end of the piston 3.

[0028] The conical portion 32 comprises a dome 321 and a plurality of inclined ribs 322 arranged below the dome, the dome 321 is provided with a first groove 3211, and the first groove 3211 is provided with a first sealing ring.

[0029] The plug portion 31 is provided with a second groove 311, and the second groove 311 is provided with a second sealing ring.

[0030] The elastic sealing element moves down to form a containing space 6 with the shell 2, and the elastic sealing element extrudes water in the containing space 6 when the ice melts into water.

[0031] The shell 2 is provided with an end cover 5, the end cover 5 comprises a cover bottom 51 and a cover ring 52 arranged on the cover bottom 51, the cover ring 52 is arranged in the shell 2 to limit the downward movement of the piston 3, and the spring 4 is arranged on the cover bottom 51.

[0032] The shell 2 is provided with an outer ring 22, the filter core 1 is arranged in the outer ring 22, the filter core 1 is provided with a central hole 11, and the conical guide pipe 21 passes through the central hole 11 of the filter core 1 and is arranged in the middle of the filter core 1.

[0033] The prefilter comprises a head 7 and a filter bottle 8 connected with the head 7, and the filter bottle 8 is provided with the anti-freezing filter element assembly.

[0034] It should be understood that the specific embodiments described herein are merely intended to explain the present utility model, and are not intended to limit the present utility model.

[0035] It should be noted that when an element is referred to as being "fixed to" or "arranged on" another element, it can be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it can be directly connected or indirectly connected to the other element.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application, and do not indicate that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise specifically limited.

Claims

1. An anti-icing filter cartridge assembly, characterized by: The filter cartridge (1), the anti-freezing assembly arranged below the filter cartridge (1), the anti-freezing assembly comprising a shell (2), and the elastic sealing element arranged in the shell (2) and capable of moving downward to open when water is frozen into ice or returning to close when the ice is melted.

2. The anti-icing filter cartridge assembly of claim 1, wherein: The shell (2) is provided with a tapered guide pipe (21) inserted into the filter cartridge (1), and the elastic sealing element is provided with a tapered portion (32) arranged in the tapered guide pipe (21).

3. The anti-icing filter cartridge assembly of claim 2, wherein: The elastic sealing element comprises a piston (3) and a spring (4) arranged below the piston (3), the piston (3) comprises a plug portion (31) arranged in the shell (2) and a tapered portion (32) arranged in the tapered guide pipe (21), the tapered portion (32) is arranged above the plug portion (31), and the spring (4) is arranged below the plug portion (31).

4. The anti-icing filter cartridge assembly of claim 3, wherein: The spring (4) has a spring force smaller than the pressure of water frozen into ice and a spring force larger than the pressure of water at the upper end of the piston (3).

5. The anti-icing filter cartridge assembly of claim 2, wherein: The tapered portion (32) comprises a dome (321) and a plurality of inclined ribs (322) arranged below the dome (321), the dome (321) is provided with a first groove (3211), and the first groove (3211) is provided with a first sealing ring.

6. The anti-icing filter cartridge assembly of claim 3, wherein: The plug portion (31) is provided with a second groove (311), and the second groove (311) is provided with a second sealing ring.

7. The anti-icing filter cartridge assembly of claim 1, wherein: The elastic sealing element moves downward to form a containing space (6) with the shell (2), and the elastic sealing element squeezes out the water in the containing space (6) when the ice is melted into water.

8. The anti-icing filter cartridge assembly of claim 3, wherein: The shell (2) is provided with an end cover (5), the end cover (5) comprises a cover bottom (51) and a cover ring (52) arranged on the cover bottom (51), the cover ring (52) is arranged in the shell (2) to limit the downward movement of the piston (3), and the spring (4) is arranged on the cover bottom (51).

9. The anti-icing filter cartridge assembly of claim 2, wherein: The shell (2) is provided with an outer ring (22), the filter cartridge (1) is arranged in the outer ring (22), the filter cartridge (1) is provided with a central hole (11), and the tapered guide pipe (21) is arranged in the middle of the filter cartridge (1) and passes through the central hole (11) of the filter cartridge (1).

10. A prefilter characterized by: The filter cartridge assembly comprises a filter head (7) and a filter bottle (8) connected with the filter head (7), the filter bottle (8) is provided with the anti-freezing filter cartridge assembly according to any one of claims 1 to 9.

Images