Pre-filter

Abstract

The utility model provides a pre-filter, which is characterized in that a machine head is provided with a water inlet end used for being communicated with a water inlet pipe and a water outlet end used for being communicated with a water outlet pipe, a first side hole and a second side hole are formed in one side of the machine head, the second side hole is communicated with a liquid outlet of a filter bottle, and a three-way valve is arranged in the machine head. The three-way valve is provided with a first port, a second port and a third port, the first port is communicated with the water inlet end, the second port is communicated with the liquid inlet of the filter bottle through the first side hole, the third port is communicated with the water outlet end, and the three-way valve is set to be in a closed state, a filtering state and a backwashing state, so that the first port is communicated with the third port when the three-way valve is in the backwashing state; the filter element in the filter bottle is subjected to back flushing through the back flushing device, and due to the fact that the impact force of back flushing is large, impurities in filter holes of the filter element can be effectively flushed out, compared with an existing conventional flushing mode, the back flushing mode can effectively remove the impurities of the filter element, and the service life of the filter element is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of filtering equipment, in particular to a pre-filter. Background Technique

[0002] After the existing pre-filter works for a long time, the impurities carried in the raw water are embedded in the mesh holes of the filter element, which is easy to cause the filter element to be blocked. Therefore, when there are more impurities attached to the filter element, the filter element needs to be cleaned, that is, the unfiltered water flow is used to wash the filter element, so that the impurities filtered by the filter element are discharged from the sewage outlet.

[0003] However, when the impurities are in the filter holes of the filter element, it is difficult to remove the impurities from the filter element by using the unfiltered water flow. Therefore, there is an urgent need to design a pre-filter assembly that can be backwashed. By switching the flow channel, a water flow in the opposite direction is generated to backwash the filter element urgently to extend the service life of the filter element. Summary of the Utility Model

[0004] In view of this, the embodiment of the utility model provides a pre-filter to solve the problem that it is difficult to remove the impurities embedded in the filter holes of the existing pre-filter.

[0005] To achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] A pre-filter includes: a machine head, a three-way valve, a sewage valve and a filter bottle;

[0007] The machine head has a water inlet end and a water outlet end. The water inlet end is used to communicate with the water inlet pipe, and the water outlet end is used to communicate with the water outlet pipe;

[0008] A first side hole and a second side hole are opened on one side of the machine head. Among them, the second side hole communicates with the liquid outlet of the filter bottle;

[0009] The three-way valve is arranged in the machine head. The three-way valve has a first port, a second port and a third port. Among them, the first port is used to communicate with the water inlet end, the second port communicates with the liquid inlet of the filter bottle through the first side hole, and the third port communicates with the water outlet end;

[0010] The three-way valve has a closed state, a filtering state and a backwashing state. When the three-way valve is in the closed state, the first port is not communicated with the second port and the third port; when the three-way valve is in the filtering state, the first port is communicated with the second port; when the three-way valve is in the backwashing state, the first port is communicated with the third port to backwash the filter element in the filter bottle;

[0011] A sewage outlet is opened at the bottom of the filter bottle;

[0012] The sewage valve is arranged at the sewage outlet.

[0013] Preferably, a silica gel sleeve is sleeved outside the three-way valve.

[0014] Preferably, it further includes: a first sealing joint disposed at the water inlet end of the machine head.

[0015] Preferably, the first sealing joint includes: a hot melt joint, a nut, a first sealing member, and a second sealing member;

[0016] The nut is sleeved on the hot melt joint, and a first limiting member is provided at the first end of the nut;

[0017] The outer wall of the hot melt joint is provided with a second limiting member for restricting the passage of the first limiting member, and the first end of the hot melt joint is used for hot melt connection with the water inlet pipe;

[0018] The outer wall of the water inlet end of the machine head is provided with an external thread that is threadedly matched with the nut;

[0019] The first sealing member and the second sealing member are disposed between the water inlet end of the machine head and the hot melt joint.

[0020] Preferably, the second limiting member is an annular convex structure;

[0021] The first sealing member is a sealing gasket;

[0022] The first sealing member is disposed between the second limiting member and the water inlet end of the machine head.

[0023] Preferably, the second sealing member is an O-ring;

[0024] A first annular groove for installing the second sealing member is circumferentially formed at the second end of the hot melt joint.

[0025] Preferably, it further includes: a pressing member;

[0026] The pressing member is an annular structure, and the pressing member is disposed inside the machine head and at the water inlet end of the machine head;

[0027] One end of the pressing member is in sealing contact with the three-way valve, and the other end is sleeved on the second end of the hot melt joint and abuts against the second limiting member;

[0028] The second sealing member is disposed between the hot melt joint and the pressing member.

[0029] Preferably, the pressing member is threadedly matched with the water inlet end of the machine head.

[0030] Preferably, it further includes: a plurality of third sealing members;

[0031] The third sealing member is an O-ring;

[0032] A plurality of second annular grooves for installing the third sealing member are circumferentially formed on the pressing member.

[0033] Preferably, it further includes: a second sealing joint disposed at the water outlet end of the machine head;

[0034] The structure of the second sealing joint is the same as that of the first sealing joint.

[0035] Based on the pre-filter provided by the above-mentioned utility model of the present application, the machine head is set to have a water inlet end for communicating with the water inlet pipe and a water outlet end for communicating with the water outlet pipe, and a first side hole and a second side hole are opened on one side of the machine head. The second side hole communicates with the liquid outlet of the filter bottle. A three-way valve is arranged inside the machine head. The three-way valve has a first port, a second port and a third port, and the first port is communicated with the water inlet end, the second port is communicated with the liquid inlet of the filter bottle through the first side hole, and the third port is communicated with the water outlet end. The three-way valve is set to a closed state, a filtering state and a backwashing state. When the three-way valve is in the closed state, the first port is not communicated with the second port and the third port; when the three-way valve is in the filtering state, the first port is communicated with the second port; when the three-way valve is in the backwashing state, the first port is communicated with the third port to perform backwashing on the filter element in the filter bottle, and a sewage discharge port is opened at the bottom of the filter bottle, and a sewage discharge valve is arranged at the sewage discharge port. Through the pre-filter disclosed above, since the present application can make water enter the filter bottle from the liquid outlet of the filter bottle through the three-way valve for backwashing, the impact force is large and it can effectively flush out the impurities in the filter holes of the filter element. Therefore, compared with the existing conventional flushing method, the backwashing method of the present application can effectively remove the impurities in the filter element and extend the service life of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0037] Figure 1 It is a schematic structural diagram of a pre-filter provided by an embodiment of the present utility model;

[0038] Figure 2 It is a schematic internal structural diagram of the pre-filter provided by an embodiment of the present utility model;

[0039] Figure 3 It is a schematic structural diagram of a hot-melt joint provided by an embodiment of the present utility model;

[0040] Figure 4 It is a schematic structural diagram of a nut provided by an embodiment of the present utility model;

[0041] Figure 5 It is a schematic structural diagram of a pressing member provided by an embodiment of the present utility model;

[0042] Figure 6 It is a schematic structural diagram of a silica gel sleeve provided by an embodiment of the present utility model;

[0043] Figure 7 Schematic diagram of the valve ball structure provided by the embodiment of the present utility model;

[0044] Figure 8 Schematic diagram of the structure of the machine head provided by the embodiment of the present utility model;

[0045] Figure 9 Partial structure schematic diagram of the filter bottle provided by the embodiment of the present utility model;

[0046] Figure 10 Schematic diagram of the water flow when the three-way valve is in the filtering state provided by the embodiment of the present utility model;

[0047] Figure 11 Schematic diagram of the water flow when the three-way valve is in the backwashing state provided by the embodiment of the present utility model;

[0048] Figure 12 Schematic diagram of the water flow when the three-way valve is in the closed state provided by the embodiment of the present utility model.

[0049] Among them, the machine head 1; the three-way valve 2, the valve ball 21; the drain valve 3; the filter bottle 4, the filter element 41, the drain port 42; the silica gel sleeve 5; the first sealing joint 6, the hot melt joint 61, the second limiting member 611, the first annular groove 612, the nut 62, the first limiting member 621, the first sealing member 63, the second sealing member 64, the pressing member 65, the second annular groove 651, the third sealing member 66; the second sealing joint 7, the fourth sealing member 8 and the fastener 9. Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0051] The embodiment of the present utility model provides a pre-filter, see Figures 1 to 12 , Figure 1 For the structure schematic diagram of the pre-filter, the pre-filter includes: a machine head 1, a three-way valve 2, a drain valve 3 and a filter bottle 4;

[0052] The machine head 1 has a water inlet end and a water outlet end. The water inlet end is used to communicate with the water inlet pipe, and the water outlet end is used to communicate with the water outlet pipe;

[0053] One side of the machine head 1 is provided with a first side hole and a second side hole. Among them, the second side hole communicates with the liquid outlet of the filter bottle 4;

[0054] The three-way valve 2 is arranged inside the machine head 1. The three-way valve 2 has a first port, a second port and a third port. Among them, the first port is used to communicate with the water inlet end, the second port communicates with the liquid inlet of the filter bottle 4 through the first side hole, and the third port communicates with the water outlet end;

[0055] The three-way valve 2 has a closed state, a filtering state and a backwashing state. When the three-way valve 2 is in the closed state, the first port is not conducted with the second port and the third port; when the three-way valve 2 is in the filtering state, the first port is conducted with the second port; when the three-way valve 2 is in the backwashing state, the first port is conducted with the third port to backwash the filter element 41 in the filter bottle 4;

[0056] A sewage discharge port 42 is opened at the bottom of the filter bottle 4;

[0057] The sewage discharge valve 3 is arranged at the sewage discharge port 42.

[0058] It should be noted that by arranging the three-way valve 2 inside the machine head 1, and making the first port of the three-way valve 2 communicate with the water inlet end, the second port of the three-way valve 2 communicate with the liquid inlet of the filter bottle 4 through the first side hole, and the third port of the three-way valve 2 communicate with the water outlet end, and then by switching the state of the three-way valve 2, the closed state, the filtering state (refer to Figure 10 ) and the backwashing state can be realized, that is, when the three-way valve 2 is in the closed state (refer to Figure 12 ), the first port is not conducted with the second port and the third port; when the three-way valve 2 is in the filtering state, the first port is conducted with the second port; when the three-way valve 2 is in the backwashing state, refer to Figure 11 , the first port is conducted with the third port to backwash the filter element 41 in the filter bottle 4. Therefore, when there is too much impurity in the filter element 41 and needs to be cleaned, the three-way valve 2 can be adjusted to the backwashing state. Through the conduction of the first port and the third port of the three-way valve 2, the water entering the water inlet end passes through the first port and the third port of the three-way valve 2 and then enters the filter bottle 4 from the liquid outlet of the filter bottle 4 to backwash the filter element 41 in the filter bottle 4. Finally, the sewage discharge valve 3 is opened, and the impurities are discharged from the sewage discharge port 42.

[0059] It should also be noted that since the second side hole communicates with the liquid outlet of the filter bottle 4, when the three-way valve 2 is in the backwashing state, the water outlet end of the machine head 1 can still discharge water normally, thus ensuring the normal use of the water outlet pipe; and when the filter element 41 needs to be replaced, the three-way valve 2 is controlled to switch to the closed state, so that the first port is not conducted with the second port and the third port, which is convenient for the user to replace the filter element 41.

[0060] The head 1 of the embodiment of the utility model has a water inlet end for communicating with the water inlet pipe and a water outlet end for communicating with the water outlet pipe, and a first side hole and a second side hole are provided on one side of the head 1. The second side hole communicates with the liquid outlet of the filter bottle 4, and the three-way valve 2 is arranged in the head 1. The three-way valve 2 has a first port, a second port and a third port, and the first port is communicated with the water inlet end, the second port is communicated with the liquid inlet of the filter bottle 4 through the first side hole, and the third port is communicated with the water outlet end. The three-way valve 2 is set to a closed state, a filtering state and a backwashing state. When the three-way valve 2 is in the closed state, the first port is not communicated with the second port and the third port; when the three-way valve 2 is in the filtering state, the first port is communicated with the second port; when the three-way valve 2 is in the backwashing state, the first port is communicated with the third port to backwash the filter element 41 in the filter bottle 4, and a sewage discharge port 42 is opened at the bottom of the filter bottle 4, and the sewage discharge valve 3 is arranged at the sewage discharge port 42. Through the above-mentioned pre-filter disclosed, since the present application can make water enter the filter bottle 4 from the liquid outlet of the filter bottle 4 through the three-way valve 2 for backwashing, the impact force is large, and the impurities in the filter holes of the filter element 41 can be effectively flushed out. Therefore, compared with the existing conventional flushing method, the backwashing method of the present application can effectively remove the impurities of the filter element 41 and extend the service life of the filter element 41.

[0061] Preferably, a threaded connector for threaded connection with the filter bottle 4 is provided on one side of the reference figure head 1.

[0062] Specifically, a silica gel sleeve 5 is sleeved outside the three-way valve 2.

[0063] It should be noted that by sleeving the silica gel sleeve 5 outside the three-way valve 2, the sealing performance between the head 1 and the three-way valve 2 can be improved, thereby preventing the water entering the head 1 from flowing out through the gap between the three-way valve 2 and the body.

[0064] Furthermore, the pre-filter further includes: a first sealing joint 6 arranged at the water inlet end of the head 1.

[0065] It should be noted that by arranging the first sealing joint 6 at the water inlet end of the head 1, the water inlet end of the head 1 can be hermetically connected to the water inlet pipe, preventing water leakage between the water inlet end and the water inlet pipe.

[0066] Specifically, the first sealing joint 6 includes: a hot melt joint 61, a nut 62, a first sealing member 63 and a second sealing member 64;

[0067] The nut 62 is sleeved on the hot melt joint 61, and a first limiting member 621 is provided at the first end of the nut 62;

[0068] A second limiting member 611 for restricting the passage of the first limiting member 621 is provided on the outer wall of the hot melt joint 61, and the first end of the hot melt joint 61 is used for hot melt connection with the water inlet pipe;

[0069] The outer wall of the water inlet end of the machine head 1 is provided with an external thread that is threadedly engaged with the nut 62;

[0070] The first seal 63 and the second seal 64 are arranged between the water inlet end of the machine head 1 and the hot melt joint 61.

[0071] It should be noted that the first end of the hot melt joint 61 is hot melt connected to the water inlet pipe, the other end is connected to the water inlet end of the machine head 1 through the nut 62, and a double-sealing structure (i.e., the first seal 63 and the second seal 64) is arranged between the water inlet end and the hot melt joint 61, which can further ensure the sealing performance of the connection between the water inlet pipe and the machine head 1, and also reduce the installation difficulty of the pre-filter, thereby improving the installation efficiency.

[0072] Specifically, the second limiting member 611 is an annular convex structure;

[0073] The first seal 63 is a sealing gasket;

[0074] The first seal 63 is arranged between the second limiting member 611 and the water inlet end of the machine head 1.

[0075] It should be noted that the second limiting member 611 is set as an annular convex structure, the first seal 63 is set as a sealing gasket, and the first seal 63 is arranged between the second limiting member 611 and the water inlet end of the machine head 1. Through the threaded cooperation between the nut 62 and the water inlet end of the machine head 1, it can effectively prevent water from leaking out from the gap between the second limiting member 611 and the machine head 1.

[0076] Preferably, the sealing gasket is made of a soft material.

[0077] Preferably, the sealing gasket is made of silicone.

[0078] Furthermore, the second seal 64 is an O-ring;

[0079] A first annular groove 612 for installing the second seal 64 is circumferentially formed at the second end of the hot melt joint 61.

[0080] It should be noted that the second seal 64 is set as an O-ring, and a first annular groove 612 for installing the second seal 64 is circumferentially formed at the second end of the hot melt joint 61. After the O-ring is installed in the first annular groove 612, the O-ring can effectively prevent water from leaking out from between the second end of the hot melt joint 61 and the water inlet end of the machine head 1 through its cooperation with the inner wall of the water inlet end of the machine head 1 and its cooperation with the first annular groove 612.

[0081] Furthermore, the pre-filter further includes: a pressing member 65;

[0082] The pressing member 65 is an annular structure, the pressing member 65 is arranged inside the machine head 1 and is located at the water inlet end of the machine head 1;

[0083] One end of the pressing member 65 is in sealing contact with the three-way valve 2, and the other end is sleeved on the second end of the hot melt joint 61 and abuts against the second limiting member 611;

[0084] The second sealing member 64 is arranged between the hot melt joint 61 and the pressing member 65.

[0085] It should be noted that by arranging the pressing member 65 inside the water inlet end of the machine head 1, setting the pressing member 65 as an annular structure, making one end of the pressing member 65 in sealing contact with the three-way valve 2, sleeving the other end on the second end of the hot melt joint 61 and abutting against the second limiting member 611, and arranging the second sealing member 64 between the hot melt joint 61 and the pressing member 65, the sealing performance of the machine head 1 can be further improved through the pressing member 65, preventing water from leaking through the gap between the machine head 1 and the three-way valve 2, and further ensuring the sealing performance of the pre-filter.

[0086] Specifically, the pressing member 65 is in threaded fit with the water inlet end of the machine head 1.

[0087] It should be noted that by setting the pressing member 65 and the water inlet end of the machine head 1 to be in threaded fit, and pressing the silicone sleeve 5 through the pressing member 65, the sealing performance between the three-way valve 2 and the machine head 1 is further improved.

[0088] Furthermore, the pre-filter further includes: a plurality of third sealing members 66;

[0089] The third sealing member 66 is an O-ring;

[0090] The pressing member 65 is circumferentially provided with a plurality of second annular grooves 651 for installing the third sealing member 66.

[0091] It should be noted that by circumferentially arranging a plurality of second annular grooves 651 for installing the third sealing member 66 on the pressing member 65 and installing the O-ring in the second annular groove 651, water can be prevented from flowing out through the gap between the pressing member 65 and the water inlet end of the machine head 1, further ensuring the sealing performance of the machine head 1.

[0092] Furthermore, the pre-filter further includes: a second sealing joint 7 arranged at the water outlet end of the machine head 1;

[0093] The second sealing joint 7 has the same structure as the first sealing joint 6.

[0094] It should be noted that by setting the structure of the second sealing joint 7 to be the same as that of the first sealing joint 6, the sealing performance between the machine head 1 and the water outlet pipe can be effectively improved, preventing water leakage.

[0095] Preferably, the machine head 1 is provided with a first notch for cooperating with the silicone sleeve 5, and the first notch is an annular groove;

[0096] On one side of the pressing member 65 in contact with the silica gel sleeve 5, a second notch adapted to the silica gel sleeve 5 is provided.

[0097] Preferably, referring to Figure 7 , the valve ball is provided with three water passing through holes and an installation opening adapted to the outer valve stem.

[0098] The valve stem is used to adjust the direction of the valve ball so as to realize the switching among the closed state, the filtering state and the backwashing state of the three-way valve 2.

[0099] Preferably, referring to Figure 6 , the silica gel sleeve 5 includes: a first ring sleeve, a second ring sleeve and a connecting piece;

[0100] The first ring sleeve and the second ring sleeve are symmetrically arranged;

[0101] Both ends of the connecting piece are respectively connected to the first ring sleeve and the second ring sleeve, and are located on the same side of the first ring sleeve and the second ring sleeve;

[0102] The connecting piece is provided with a first through hole for water flow to pass through.

[0103] Preferably, referring to Figure 9 , a fourth seal 8 and a fastener 9 are provided at the bottom of the filter bottle 4.

[0104] A third annular groove for installing a sealing ring is circumferentially provided at the upper end of the fourth seal 8;

[0105] A second through hole for sewage to pass through is provided at the center of the fourth seal 8;

[0106] Internal threads adapted to the sewage discharge valve 3 are provided in the second through hole;

[0107] External threads adapted to the fastener 9 are provided on the outer wall at the lower end of the fourth seal 8.

[0108] Preferably, the machine head 1 is made of metal, and the inner wall of the machine head 1 is coated with plastic.

[0109] It should be noted that by coating the inner wall of the machine head 1 with plastic, water pollution caused by the metal machine head 1 can be avoided.

[0110] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-filter, characterized in that: include: Machine head, three-way valve, drain valve and filter bottle; The machine head has a water inlet end and a water outlet end, the water inlet end is used to communicate with the water inlet pipe, and the water outlet end is used to communicate with the water outlet pipe; A first side hole and a second side hole are formed on one side of the machine head, wherein the second side hole is connected to the liquid outlet of the filter bottle; The three-way valve is arranged in the machine head, and has a first port, a second port and a third port, wherein the first port is used to communicate with the water inlet end, the second port is communicated with the liquid inlet of the filter bottle through the first side hole, and the third port is communicated with the water outlet end; The three-way valve has a closed state, a filtering state and a backwashing state. When the three-way valve is in the closed state, the first port is not connected to the second port and the third port; when the three-way valve is in the filtering state, the first port is connected to the second port; when the three-way valve is in the backwashing state, the first port is connected to the third port to backwash the filter element in the filter bottle; A sewage outlet is provided at the bottom of the filter bottle; The sewage discharge valve is arranged at the sewage discharge port.

2. The pre-filter according to claim 1, characterized in that: The outer sleeve of the three-way valve is provided with a silicone sleeve.

3. The pre-filter according to claim 1, characterized in that: Also includes: A first sealing joint is arranged at the water inlet end of the machine head.

4. The pre-filter according to claim 3, characterized in that: The first sealing joint comprises: a hot melt joint, a nut, a first sealing member and a second sealing member; The nut is sleeved on the hot melt joint, and a first stopper is provided at the first end of the nut; The outer wall of the hot melt joint is provided with a second stopper which limits the passage of the first stopper, and the first end of the hot melt joint is used for hot melt connection with the water inlet pipe; The outer wall of the water inlet end of the machine head is provided with an external thread matching with the nut thread; The first sealing member and the second sealing member are arranged between the water inlet end of the machine head and the hot melt joint.

5. The pre-filter according to claim 4, characterized in that: The second limiting member is an annular protruding structure; The first sealing member is a sealing gasket; The first sealing member is arranged between the second limiting member and the water inlet end of the machine head.

6. The pre-filter according to claim 5, characterized in that: The second sealing member is a sealing ring; A first annular groove for mounting the second sealing member is circumferentially formed at the second end of the heat-melt joint.

7. The pre-filter according to claim 6, characterized in that: Also includes: Clamping parts; The pressing member is an annular structure, and the pressing member is arranged in the machine head and located at the water inlet end of the machine head; One end of the pressing member is in sealing contact with the three-way valve, and the other end is sleeved on the second end of the hot melt joint and abuts against the second limiting member; The second sealing member is disposed between the hot melt joint and the pressing member.

8. The pre-filter according to claim 7, characterized in that: The pressing piece is threadably matched with the water inlet end of the machine head.

9. The pre-filter according to claim 7, characterized in that: Also includes: a number of tertiary seals; The third sealing member is a sealing ring; The clamping member is circumferentially provided with a plurality of second annular grooves for mounting the third sealing member.

10. The pre-filter according to any one of claims 3 to 6, characterized in that: Also includes: A second sealing joint provided at the water outlet end of the machine head; The second sealing joint has the same structure as the first sealing joint.

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