Filter head and filter assembly comprising same

Abstract

Provided according to an embodiment of the present invention are a filter head and a filter assembly comprising same, the filter head comprising: a filter head housing that has an inlet part and an outlet part and also has a fastening part that fastens to a filter; and a flow path switching part which is provided inside the housing and in which the flow path is switched according to the fastening of the filter, wherein the flow path switching part comprises: a first switching part which, when the filter is mounted, opens a first flow path providing fluid communication with the filter, and, when the filter is separated, closes the first flow path; and a second switching part which opens and closes a second flow path by descending or ascending depending on whether or not the filter is mounted.

Description

Filter head and filter assembly including the same

[0001] The present invention relates to a filter head and a filter assembly including the same.

[0002] Recently, as environmental pollution, especially water pollution, has become a social problem, the use of water purification devices that physically or chemically filter water to remove impurities is increasing.

[0003] These water purifiers filter out various harmful substances contained in raw water, such as tap water or groundwater, converting it into safe and sanitary drinking water. Conventional water purifiers typically feature multiple filters to remove harmful substances and filter out suspended solids from raw water.

[0004] These water purifiers may be equipped with various filters to filter the raw water. Since these filters physically filter out harmful substances or foreign substances, they require periodic replacement. These filters are mounted on a filter head to communicate with the water purifier. When a filter reaches the end of its lifespan or a certain replacement cycle is reached, it is removed from the filter head for replacement and a new filter is installed. The filter head is equipped with a bypass function so that when the filter is removed for replacement, the raw water is discharged without passing through the filter.

[0005] Additionally, since a bypass euro is included in the filter head, users who do not wish to use a filter can use the water supply system of the water purifier by discharging raw water without installing a filter.

[0006] However, there is a problem that the O-ring included in the filter head becomes stuck over time, preventing the euro switch from working properly.

[0007] [Prior Art Literature]

[0008] [Patent Document]

[0009] (Patent Document 0001) Republic of Korea Publication No. 10-2010-0012979 (Published on February 9, 2010)

[0010]

[0011] The present invention has been devised to solve the above-mentioned technical problem, and its purpose is to provide a filter head that releases the fixation of an O-ring included in the filter head by raw water pressure, and a filter assembly including the same.

[0012] The purpose is to provide a filter head and a filter assembly including the same that improves the reliability of bypass euro operation by releasing the fixation of an O-ring included in the filter head.

[0013] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0014] A filter head according to one embodiment of the present invention,

[0015] A filter head housing having an inlet and an outlet and including a connecting portion connected to a filter; and

[0016] It includes a Euro conversion part that is included inside the housing and converts the Euro according to the connection with the filter;

[0017] The above Euro conversion part is,

[0018] A first switching unit that opens a first flow path in fluid communication with the filter when the filter is mounted and closes the first flow path when the filter is removed; and

[0019] It may include a second switching unit that opens and closes the second flow path by lowering or rising depending on whether the above filter is mounted.

[0020] According to one embodiment of the present invention,

[0021] The above first switching unit is,

[0022] A first shaft included inside the second switching section and raised or lowered by the removal of the filter to open or close the first flow path;

[0023] A first elastic member included inside the second switching member to assist the lowering of the first shaft; and

[0024] It may include an inner shaft into which one side of the first shaft is inserted and the first passage is opened by the elevation of the first shaft.

[0025] According to one embodiment of the present invention,

[0026] The above second switching unit is,

[0027] A second shaft included inside the housing to open or close the second passage by lowering or rising by detaching the filter; and

[0028] It may include a second elastic member included on one side of the inside of the housing to assist the pressure of the raw water to lower the second shaft.

[0029] According to one embodiment of the present invention,

[0030] The above second shaft,

[0031] A shaft inlet passage may be included to enable the introduction of the raw water into the first euro.

[0032] According to one embodiment of the present invention,

[0033] The above housing,

[0034] It may include a third passageway that is connected to the discharge portion and through which water filtered by the filter or the raw water that has passed through the second passageway is discharged.

[0035] According to one embodiment of the present invention,

[0036] The above housing,

[0037] It may include a shaft cover that prevents the second shaft from being detached and opens and closes the water passage by the elevation or descent of the second shaft.

[0038] According to one embodiment of the present invention,

[0039] The above first shaft,

[0040] The first O-ring, which comes into contact with the inner shaft by the lowering of the first shaft, can seal the first passage.

[0041] According to one embodiment of the present invention,

[0042] The second O-ring, which comes into contact with one side of the housing by the lowering of the second shaft, can seal the second passage.

[0043] According to one embodiment of the present invention,

[0044] The above second shaft,

[0045] The third O-ring that comes into contact with the shaft cover by the lowering of the second shaft can seal the water passage.

[0046] According to one embodiment of the present invention,

[0047] The above housing,

[0048] A separating part may be included between the third flow path and the second shaft so that the second flow path is formed according to the elevation or lowering of the second shaft.

[0049] According to one embodiment of the present invention,

[0050] The above second switching unit is,

[0051] A step portion is included that protrudes to a predetermined height to form a step;

[0052] The protrusion of the above filter can be caught on the step portion and rotate the second switching portion.

[0053] According to one embodiment of the present invention,

[0054] The above second switching unit is,

[0055] An anti-rotation part is included that protrudes from the outer surface of the second switching part to form a protruding groove, thereby preventing rotation of the second switching part.

[0056] A filter assembly according to one embodiment of the present invention comprises:

[0057] A filter for filtering fluid; and

[0058] A filter head coupled with the above filter;

[0059] The above filter head,

[0060] A filter head housing having an inlet and an outlet and including a connecting portion connected to the filter; and

[0061] It includes a Euro conversion part that is included inside the housing and converts the Euro according to the connection with the filter;

[0062] The above Euro conversion part is,

[0063] A first switching unit that opens a first flow path in fluid communication with the filter when the filter is mounted and closes the first flow path when the filter is removed; and

[0064] It may include a second switching unit that opens and closes the second flow path by lowering or rising depending on whether the above filter is mounted.

[0065] According to one embodiment of the present invention, a filter head and a filter assembly including the same can be provided that release the fixation of an O-ring included in the filter head by raw water pressure.

[0066] A filter head and a filter assembly including the same can be provided to improve the reliability of bypass euro operation by releasing the fixation of an O-ring included in the filter head.

[0067] FIG. 1 is a perspective view of a filter assembly according to one embodiment of the present invention;

[0068] Figure 2 is a cross-sectional view of a filter assembly according to one embodiment of the present invention;

[0069] Figure 3 is an exploded cross-sectional view of a filter and a filter head according to one embodiment of the present invention.

[0070] Figure 4 is a cross-sectional view of a filter head according to one embodiment of the present invention;

[0071] FIG. 5 is a cross-sectional view illustrating a filter head having a filter combined therewith according to one embodiment of the present invention.

[0072] FIG. 6 is a drawing showing a second switching unit according to rotation of a filter according to one embodiment of the present invention.

[0073] Figure 7 is an exploded view of a first switching unit according to one embodiment of the present invention.

[0074] Figure 8 is an exploded view of a second switching unit according to one embodiment of the present invention.

[0075] FIG. 9 is a drawing showing a flow conversion structure and the flow of raw water and purified water according to the removal of a filter from a filter head according to one embodiment of the present invention.

[0076]

[0077] Hereinafter, one embodiment of a filter head and a filter assembly including the same according to the present invention will be described in detail with reference to the attached drawings.

[0078] When assigning reference numerals to components in each drawing, it should be noted that identical components are assigned the same numerals whenever possible, even if they appear on different drawings. Furthermore, when describing embodiments of the present invention, if a detailed description of a related known configuration or function is deemed to hinder understanding of the embodiments of the present invention, the detailed description will be omitted.

[0079] In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0080]

[0081] FIG. 1 is a perspective view of a filter assembly according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a filter assembly according to an embodiment of the present invention, FIG. 3 is an exploded cross-sectional view of a filter and a filter head according to an embodiment of the present invention, FIG. 4 is a cross-sectional view of a filter head according to an embodiment of the present invention, FIG. 5 is a cross-sectional view showing a filter head to which a filter is coupled according to an embodiment of the present invention, FIG. 6 is a drawing showing a second switching unit according to rotation of a filter according to an embodiment of the present invention, FIG. 7 is an exploded view of a first switching unit according to an embodiment of the present invention, FIG. 8 is an exploded view of a second switching unit according to an embodiment of the present invention, and FIG. 9 is a drawing showing a flow path switching structure and the flow of raw water and purified water according to attachment and detachment of a filter to a filter head according to an embodiment of the present invention.

[0082]

[0083] The filter head (10) according to FIG. 1 to FIG. 9 includes a filter head housing (100) having an inlet (101) and an outlet (102) and a fastening portion (104) fastened to the filter (20), and a flow path switching portion included inside the filter head housing (100) for switching the flow path according to the fastening to the filter (20), so that the flow path can be switched depending on whether the filter (20) is mounted.

[0084] The filter head housing (100) may have an inlet (101) formed on one side into which a fluid such as raw water can be introduced, and an outlet (102) formed on the other side into which purified water filtered by a filter (20) coupled to the filter head (10) or raw water converted by a flow path conversion unit, i.e., raw water passing through a bypass flow path, is discharged.

[0085] In addition, the filter head housing (100) may include a fastening portion (104) to enable coupling with the filter. The filter (20) may include an insertion portion that is inserted into the fastening portion (104), and a coupling rib (21) may be formed in the insertion portion. The inner surface of the filter head housing (100) may include a coupling guide (105) formed with a predetermined incline, so that the insertion portion of the filter (20) may be inserted into the fastening portion (104) and the coupling rib (21) may rotate along the coupling guide (105) to be coupled, but the coupling method is not limited thereto. The insertion portion of the filter (20) is inserted into the fastening portion (104) of the filter head (10), and the filter (20) and the filter head (20) can be connected by rotation of the filter (20), and as the filter (20) and the filter head (10) are connected, the raw water or fluid flowing in from the inlet portion (101) of the filter head (10) flows into the filter (20), and purified water filtered through the filter (20) can be discharged through the discharge portion (102) of the filter head (10).

[0086] The outer surface of the insertion portion of the filter (20) may include at least one O-ring. The O-ring may be included in the outer surface of the insertion portion of the filter (20) to come into contact with the inner surface of the filter head (10), and may be sealed by the O-ring to prevent water leakage.

[0087] In addition, the inlet (101) and outlet (102) of the filter head (10) each include at least one O-ring to prevent leakage that may occur in connection with the flow pipe inserted into and connected to the filter head (10).

[0088]

[0089] The filter head (10) includes a flow path switching unit so that the flow path can be switched depending on whether the filter (20) is mounted. More specifically, the flow path switching unit includes a first switching unit (110) that opens a first flow path (106) so that raw water flowing into the inlet (101) can be introduced into the filter (20) by mounting the filter (20) and closes the first flow path (106) by detaching the filter (20), and a second switching unit (120) that opens a second flow path (107) by the pressure of the raw water flowing into the inlet (101) when detaching the filter (20) and closes the second flow path (107) by detaching the filter (20), so that raw water or purified water can be discharged by switching the flow path depending on whether the filter (20) mounted on the filter head (10) is mounted.

[0090]

[0091] More specifically, the first switching unit (110) may include a first shaft (111) that is included inside the second switching unit (120) and opens or closes the first flow path (106) by descending or ascending by the detachment or attachment of the filter (20), a first elastic member (113) that is included inside the second switching unit (120) and assists the descent of the first shaft (111), and an inner shaft (112) into which one side of the first shaft (111) is inserted and through which the first flow path (106) is opened by the elevation of the first shaft (111). Here, the first elastic member (103) may be included as, for example, a spring having elastic restoring force, but is not limited thereto.

[0092] More specifically, the inner shaft (112) may be included in one side of the second switching unit (120). The inner shaft (112) may have a hollow hole (116) formed therein, and one side of the first shaft (111) may be inserted into the hollow hole (116), so that the first flow path (106) may be opened or closed according to the elevation or lowering of the first shaft (111). The hollow hole (116) may be formed to correspond to the shape of the contact surface of the first shaft (111) that is inserted into and makes contact with the hollow hole (116), and may be inserted so as to be in close contact with the hollow hole (116) formed to correspond to the contact surface of the first shaft (111) by the lowering of the first shaft (111), so that the first flow path (106) may be easily closed.

[0093] In addition, the first shaft (111) may include a first O-ring (115) that comes into contact with the inner shaft (112) by lowering the first shaft (111) to seal the first flow path (106). When the filter (20) is removed, the first shaft (111) is lowered to close the first flow path (106), thereby preventing leakage of raw water to the outside through the filter fastening portion (104). More specifically, the first shaft (111) may include a first O-ring groove (115a) into which the first O-ring (115) is inserted, and the first O-ring (115) is inserted into the first O-ring groove (115a) to be positioned so as to be in close contact with the inner shaft (112) by lowering the first shaft (111), thereby closing and sealing the first flow path (106).

[0094]

[0095] The filter head (10) may include a second switching unit (120). The second switching unit (120) may include a second shaft (121) that is included inside the filter head housing (100) and opens or closes the second flow path (107) by lowering or rising by the detachment or attachment of the filter (20), and a second elastic unit (122) that is included on one side of the housing and applies elastic force together with the pressure of the raw water to lower the second shaft (121). In addition, the second shaft (121) may include a first switching unit (110) so that one side of the first elastic unit (112) is mounted on the second shaft (121).

[0096] In addition, the second shaft (121) includes a shaft inlet passage (126) to allow the raw water to flow into the first passage (106), so that the raw water flowing in through the inlet (101) can flow into the first passage (106).

[0097]

[0098] When the filter (20) is mounted on the filter head (10), one side of the first switching unit (110) and one side of the second switching unit (120) may be included to be in contact with one side of the insertion portion of the filter (20). As the filter head (10) and the filter (20) are fastened, one side of the first switching unit (110) and one side of the second switching unit (120) are pushed by the filter and raised and lowered, so that the first flow path (106) can be opened and the second flow path (107) can be closed. As the first flow path (106) is opened and the second flow path (107) is closed, the raw water that has entered the filter head (10) through the inlet (101) can enter the filter (20) through the first flow path (106) and be filtered by the filter (20), and the filtered purified water can be discharged through the discharge portion (102).

[0099] When the filter (20) is detached from the filter head (10), the pressure applied by the filter (20) is relieved, and the first shaft (111) may be lowered by the first elastic member (113) to close the first flow path (106). As the first flow path (106) is closed, the pressure may increase due to the raw water flowing into the filter head housing (100), and the second shaft (121) may be lowered by the pressure of the increased raw water. The second shaft (121) may be lowered to open the second flow path (107), and the raw water flowing into the filter head by the opening of the second flow path (107) may be discharged through the discharge portion (102). Here, the lowering of the second shaft (121) is not limited to the pressure of the raw water, and may also be lowered by a force generated by the elastic force of the second elastic member (122) included inside the filter head housing (100). Here, the second elastic member (122) may be, for example, a spring having elastic restoring force, but is not limited thereto.

[0100] According to one embodiment of the present invention, the filter head (10) can switch the flow path inside the filter head (10) by lowering the second shaft (121) by the pressure of the raw water flowing in through the inlet (101) when the filter (20) is removed, and the fixation of the O-ring can be released by lowering the second shaft (121) by the pressure of the raw water. More specifically, the pressure generated by the raw water can generate a pressure that is approximately 10 times higher than the elastic force of the elastic body, and the raw water generates a pressure higher than the pressure of the elastic body to lower the second shaft (121) and easily release the fixation of the O-ring.

[0101]

[0102] The filter head housing (100) may include a separation portion (103) between the third flow path (108) and the second shaft (121) so that the second flow path (107) is formed according to the elevation or lowering of the second shaft (121). The separation portion (103) may be formed on one side of the receiving space of the filter head housing (100) that accommodates the second shaft (121) and may be formed as a wall close to the discharge portion (102) so that the raw water introduced through the inlet portion (101) is not directly discharged to the discharge portion (102) without going through the first flow path (106) or the second flow path (107), and the second flow path (107) may be opened or closed as the second shaft (121) comes into contact with or is separated from the separation portion (103) according to the elevation or lowering of the second shaft (121). The second flow path (107) is opened or closed by contact or separation of the separation unit (107), so that the raw water flowing into the filter head (10) or the purified water filtered and discharged from the filter (20) can pass through the third flow path (108) included in the filter housing head (100) and be discharged to the discharge unit (102).

[0103] The filter head housing (100) may include a shaft cover (130) that prevents the second shaft (121) from being detached and opens and closes the water passage (108) by the elevation or lowering of the second shaft (121). The shaft cover (130) may be inserted and coupled to the fastening portion (104) of the filter head housing (100), and by including the shaft cover (130), the separation of the second shaft (121) may be prevented. In addition, the shaft cover (130) may include a water passage (108) that opens and closes by the elevation or lowering of the second shaft (121). More specifically, the purification flow path (108) can be opened by the elevation of the second shaft (121) and closed by the elevation, and purified water filtered by the filter (20) through the purification flow path (108) can flow into the third flow path (109) and be discharged through the discharge portion (102).

[0104]

[0105] In addition, the second switching unit (120) may include at least one O-ring. More specifically, the second switching unit (120) may include a second O-ring (124) and a third O-ring (125). A second O-ring groove (124a) into which a second O-ring (124) is inserted may be included on an outer surface that closes the second flow path (107) by contact with one side of the head housing (100) and the separation unit (103) as the second shaft rises, and the second O-ring (124) may be inserted, and a third O-ring groove (125a) into which a third O-ring (125) is inserted may be included on an outer surface that closes the water passage (108) by contact with one side of the shaft cover (130) as the second shaft (121) descends, and the third O-ring (125) may be inserted. The second O-ring (124) can seal the second passage (107) closed by coming into close contact with one side of the filter head housing (100) and the separation part (103) by lowering the second shaft (121) so that raw water does not flow in, and when the second shaft (121) is lowered and the second passage (107) is opened, the third O-ring (125) can seal the purified water passage (108) by coming into contact with one side of the shaft cover (130). The second O-ring (124) and the third O-ring (125) can seal the second passage (107) and the purified water passage (108) respectively by rising or falling of the second shaft (121).

[0106]

[0107] The first shaft (121) may have a fixing groove (114) formed so that one side of the second shaft (121) can be inserted, and the second shaft (121) may include a fixing portion (123) that is formed to protrude so as to be inserted into the fixing groove (114). The fixing portion (123) is included so as to be insertable into the fixing groove (114), thereby preventing the first shaft (111) from being dislodged and aligning it. The fixing portion (123) is inserted into the fixing groove (114), thereby preventing the first shaft (111) from being dislodged when the first shaft (111) is raised or lowered.

[0108]

[0109] A step portion (127) may be formed in the second switching unit (120). The step portion (127) may be formed by protruding at a predetermined height on one side of the second switching unit (120), and the second switching unit (120) may rotate according to the rotation of the filter (20) as the protrusion (22) formed in the insertion portion of the filter (20) is caught on the step of the step portion (127), and the second switching unit (120) may rotate according to the rotation of the filter (20) by the step portion (127), thereby releasing the fixation of the O-rings (124, 125) included in the second switching unit (120).

[0110] In addition, the second switching unit (120) may include a rotation prevention unit (128). The rotation prevention unit (128) may be formed on the outer surface of the second switching unit (120), and may include a groove formed so as to protrude and vertically slide on the outer surface of the second switching unit (120), so that one side of the filter head housing (100) or shaft cover (130) is inserted into the slide groove of the rotation prevention unit (125) to enable vertical movement but prevent rotational movement, thereby further including a structure to prevent the second switching unit (120) from rotating according to the rotation of the filter (20).

[0111]

[0112] A filter head (10) according to one embodiment of the present invention is equipped with a bypass flow path so that the flow path can be switched depending on whether a filter (20) is mounted to allow raw water to be introduced and discharged, and further, since the flow path is switched by the pressure of the raw water, the fixation of the O-ring can be released more easily than a structure that switches the flow path by relying on an elastic member including a spring.

[0113]

[0114] It should be understood that the embodiments of the present invention are not necessarily limited to the above-described embodiments, and that those skilled in the art will readily appreciate the possibility of various modifications and implementations within an equivalent scope. Therefore, the true scope of the present invention is defined by the claims set forth below.

[0115]

[0116] [Explanation of symbols]

[0117] 1: Filter assembly 10: Filter head

[0118] 20; Filter 21: Combination rib

[0119] 22: Protrusion 100: Filter head housing

[0120] 101: Inlet 102: Outlet

[0121] 103: Separation part 104: Fastening part

[0122] 105: Combination Guide 106: First Euro

[0123] 107: Second Euro 108: Integer Euro

[0124] 109: Euro 3 110: Transition 1

[0125] 111: First shaft 112: Inner shaft

[0126] 113: First elastic part 114: Fixed groove

[0127] 115: 1st O-ring 115a: 1st O-ring groove

[0128] 116: Hollow Hall 120: Second Transition Section

[0129] 121: Second shaft 122: Second elastic member

[0130] 123: Fixed part 124: Second O-ring

[0131] 124a: 2nd O-ring groove 125: 3rd O-ring

[0132] 125: Third O-ring groove 126: Shaft inlet passage

[0133] 127: Stepped section 128: Anti-rotation section

[0134] 130: Shaft cover

Claims

1. A filter head housing having an inlet and an outlet and including a connecting portion connected to a filter; and It includes a Euro conversion part that is included inside the housing and converts the Euro according to the connection with the filter; The above Euro conversion part is, A first switching unit that opens a first flow path in fluid communication with the filter when the filter is mounted and closes the first flow path when the filter is removed; and A filter head including a second switching unit that opens and closes a second flow path by lowering or rising depending on whether the filter is mounted.

2. In paragraph 1, The above first switching unit is, A first shaft included inside the second switching section and raised or lowered by the removal of the filter to open or close the first flow path; A first elastic member included inside the second switching member to assist the lowering of the first shaft; and A filter head including an inner shaft into which one side of the first shaft is inserted and into which the first passage is opened by the elevation of the first shaft.

3. In paragraph 1, The above second switching unit is, A second shaft that descends by the pressure of the raw water when the filter is separated and rises by the installation of the filter to open and close the second passage; and A filter head comprising a second elastic member included on one side of the housing to assist the pressure of the raw water to lower the second shaft.

4. In paragraph 3, The above second shaft, A filter head including a shaft inlet passage to enable the introduction of the raw water into the first euro.

5. In paragraph 3, The above housing, A filter head including a third channel, which is connected to the discharge unit and through which water filtered by the filter or the raw water passing through the second channel is discharged.

6. In paragraph 3, The above housing, A filter head including a shaft cover that prevents the second shaft from being dislodged and opens and closes the water passage by the elevation or descent of the second shaft.

7. In paragraph 2, The above first shaft, A filter head that seals the first flow path, including a first O-ring that comes into contact with the inner shaft by the lowering of the first shaft.

8. In paragraph 3, A filter head that seals the second passage, including a second O-ring that comes into contact with one side of the housing by the lowering of the second shaft.

9. In paragraph 6, The above second shaft, A filter head that seals the water passage, including a third O-ring that comes into contact with the shaft cover by the lowering of the second shaft.

10. In paragraph 5, The above housing, A filter head including a separator between the third flow path and the second shaft so that the second flow path opens according to the elevation or lowering of the second shaft.

11. In paragraph 1, The above second switching unit is, A step portion is included that protrudes to a predetermined height to form a step; A filter head in which the protrusion of the filter is caught on the step and the second switching unit is rotated.

12. In paragraph 1, The above second switching unit is, A filter head including a rotation preventing portion that protrudes from the outer surface of the second switching portion to form a protruding groove, thereby preventing rotation of the second switching portion.

13. A filter for filtering fluid; and A filter head coupled with the above filter; The above filter head, A filter head housing having an inlet and an outlet and including a connecting portion connected to the filter; and It includes a Euro conversion part that is included inside the housing and converts the Euro according to the connection with the filter; The above Euro conversion part is, A first switching unit that opens a first flow path in fluid communication with the filter when the filter is mounted and closes the first flow path when the filter is removed; and A filter assembly comprising a second switching unit that opens and closes a second flow path by lowering or rising depending on whether the filter is mounted.

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