Filtering device and filtering system

Abstract

The invention discloses a filtering device which comprises a filter element assembly, a shell and a liquid discharging piece, an outer cavity space of the filtering device is arranged between the shell and the filter element assembly, and an inner cavity space of the filtering device is arranged in the filter element assembly; the shell is provided with a liquid drainage piece mounting part connected with the liquid drainage piece; the filter element assembly comprises a center part, a filter medium and a medium bearing part, the filter medium surrounds the center part, the medium bearing part is connected with the center part and used for fixing the filter medium, and the center part is provided with a discharging part, a fluid inlet and a fluid outlet. The discharging part is provided with a discharging channel allowing fluid to enter the outer cavity space or the liquid discharging piece from the inner cavity space. The liquid discharging piece is detachably connected with the discharging part, and the liquid discharging piece and the filter element assembly form detachable sealing.

Description

Technical Field

[0001] The invention relates to the field of liquid and gas filters, and in particular to a filtering device and a filtering system with the filtering device. Background Art

[0002] In order to discharge the waste liquid in the filter, the existing filter is usually provided with a drain valve assembly at the bottom of the filter, and the discharge of the waste liquid is achieved by opening or closing the drain valve. For example, the publication number is CN108367217B, and the utility model name is a filter system using a self-ventilating discharge pipe. The utility model includes an upper end cover, a lower end cover, filter paper, a central tube and a discharge assembly. The filter paper is installed between the upper end cover and the lower end cover, the central tube is arranged inside the filter paper, and the two sides of the central tube are connected to the upper end cover and the lower end cover. The lower end cover is connected to the discharge assembly through a thread, and the discharge assembly is used to discharge the waste liquid in the filter. Since one end of the filter paper is fixedly connected to the upper end cover, and the upper end cover is fixed to the shell, that is, one end of the filter paper is fixed by the shell, and the other end of the filter paper is fixedly connected to the lower end cover, the lower end cover is in a suspended state, that is, the force acting on the lower end cover will be applied to the filter paper.

[0003] When the filter needs to drain, the drain valve assembly needs to be completely unscrewed from the filter or unscrewed a certain distance. When the drain valve assembly is unscrewed outward, since the drain valve assembly in the filter is directly connected to the thread of the end cover, the drain valve assembly will apply an outward pulling force to the end cover. The pulling force applied by the drain valve assembly to the end cover will act on the filter paper, causing the filter paper to bear the outward pulling force. Similarly, when the drain valve assembly is screwed into the filter, the filter paper will be subjected to pressure. Since filter paper is generally made of softer materials, it is very easy to deform when subjected to tension or pressure, resulting in reduced filtering performance or failure. Summary of the invention

[0004] The present invention aims to solve the problem that the existing filter paper is easy to deform, resulting in reduced filtering performance or failure.

[0005] The present invention provides a filtering device and a filtering system with the filtering device to solve the above technical problem.

[0006] The technical solution described in the present invention is:

[0007] A filter device comprises a filter element assembly, a housing and a liquid discharge member, wherein an outer cavity space of the filter device is provided between the housing and the filter element assembly, and an inner cavity space of the filter device is provided inside the filter element assembly;

[0008] The housing is provided with a liquid discharge member installation portion connected to the liquid discharge member;

[0009] The filter element assembly comprises a central component, a filter medium and a medium carrier, wherein the filter medium surrounds the central component, the medium carrier is connected to the central component and is used to fix the filter medium, the central component is provided with a discharge portion, a fluid inlet and a fluid outlet, and the discharge portion is provided with a discharge channel allowing the fluid to enter the outer cavity space or the discharge member from the inner cavity space;

[0010] The drainage piece is detachably connected to the discharge portion, and the drainage piece and the filter element assembly form a detachable seal. According to different drainage requirements, the space between the discharge portion and the drainage piece can be designed to belong to a part of the outer cavity space or a part of the inner cavity space.

[0011] Preferably, the discharge portion is arranged inside the central component or extends toward the outside of the central component, and the discharge channel is a hole structure or the discharge channel is provided with a fluid conveying component.

[0012] Preferably, the central component includes a connecting cover and a central tube, the connecting cover and the central tube are integrally formed or separately connected, the connecting cover or the central tube is provided with an external connection portion with a protruding surface, and at least a part of the external connection portion is located above the central tube or the fluid inlet or the fluid outlet.

[0013] Preferably, the medium carrier is provided with a sealing portion, the sealing portion is connected to the central pipe, the sealing portion and the drainage member form a detachable seal, and the sealing portion is provided with a drainage guide structure.

[0014] Preferably, the central component is provided with a sealing portion, the sealing portion and the drainage member form a detachable seal, and the sealing portion is provided with a drainage guiding structure.

[0015] Preferably, the drainage member is provided with a drainage channel and a drainage barrier, the drainage member can detachably seal the discharge portion through the drainage barrier, and the filter element assembly can detachably seal the drainage channel.

[0016] Preferably, the medium carrier or the central component is provided with a siphon wall, and the siphon wall and the drainage component mounting portion cooperate to generate a siphon.

[0017] Preferably, it includes a No. 1 seal, which is arranged on the drainage member installation portion or on the drainage member, and a detachable seal is formed between the drainage member installation portion and the drainage member through the No. 1 seal.

[0018] Preferably, the device comprises a covering member, wherein the covering member detachably covers the fluid outlet.

[0019] Preferably, the filter element assembly further comprises a media seal, which is disposed between the media carrier and the filter medium and between the central component and the filter medium, and the media seal detachably connects the media carrier and the central component.

[0020] Preferably, a No. 2 seal is included, and the No. 2 seal is arranged on the sealing part or the drainage part, and a detachable seal is formed between the sealing part and the drainage part through the No. 2 seal.

[0021] Preferably, the seal formed by the No. 1 seal is an end face seal.

[0022] Preferably, the seal formed by the second seal is an end face seal.

[0023] A filtering system includes a filter head, the filtering device, a No. 3 seal and a No. 4 seal, wherein the No. 3 seal is arranged on an outer shell or a central component, and the No. 4 seal is arranged on the filter head or the central component. A detachable seal is formed between the outer shell and the central component by the No. 3 seal, and a detachable seal is formed between the filter head and the central component by the No. 4 seal.

[0024] Preferably, the filter head is provided with a filter outlet and a filter inlet which cooperate with the fluid outlet and the fluid inlet, and the filter head is provided with an elastic member which covers the filter outlet or the filter inlet.

[0025] Compared with the prior art, the present invention has the following advantages and effects:

[0026] 1. The drain piece is fixed by the central tube. When the drain piece is unscrewed, the force generated is applied to the central tube. Since the filter medium is not fixed by the central tube, the force applied to the central tube will not be applied to the filter medium, thereby not causing deformation of the filter medium.

[0027] 2. A discharge portion is provided on the central tube, so that the fluid in the central tube can be discharged from the filtering device, which is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A schematic diagram of an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of another embodiment of the present invention;

[0031] Figure 3 A schematic diagram of another embodiment of the present invention;

[0032] Figure 4A schematic diagram of another filter element assembly embodiment of the present invention;

[0033] Figure 5 A schematic diagram of another embodiment of the present invention;

[0034] Figure 6 A schematic diagram of another embodiment of the present invention;

[0035] Figure 7 A schematic diagram of another embodiment of the present invention;

[0036] Figure 8 A schematic diagram of another embodiment of the present invention;

[0037] Fig. 9 A schematic diagram of another embodiment of the present invention;

[0038] Fig.10 It is a schematic diagram of another embodiment of the present invention. Description of the drawings:

[0040] 1-housing; 2-filter element assembly; 3-drainage member; 4-filter medium; 5-medium carrier;

[0041] 6-filter head; 7-center tube; 8-connection cover; 9-discharge part; 10-discharge channel;

[0042] 11-liquid discharge member installation portion; 12-sealing portion; 13-liquid discharge guide structure; 14-liquid discharge channel;

[0043] 15-liquid discharge barrier; 16-siphon wall; 17-No. 1 sealing member; 18-No. 2 sealing member;

[0044] 19- medium seal; 20- external connection part; 21- covering part; 22- filter outlet;

[0045] 23-filter inlet; 24-elastic plug; 25-No. 3 seal; 26-No. 4 seal. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with embodiments. The following embodiments are for explanation of the present invention but the present invention is not limited to the following embodiments.

[0047] Embodiment 1:

[0048] A filter device includes a housing, a filter element assembly and a drain member. The housing can use the housing structure of an existing filter, the housing can adopt the housing structure of a conventional spin-on filter, such as a cylindrical housing structure, and its material can be selected from existing materials, such as aluminum alloy, steel, glass fiber, etc. Figure 1As shown, a structure of the housing 1 is shown. The space between the housing and the filter element assembly is the outer cavity space of the filter device, and the space inside the filter element assembly is the inner cavity space of the filter device. The outer cavity space and the inner cavity space are used to contain fluid when the filter is in use. Figure 2 and 3 In one example shown, the filter element assembly 2 is installed in the housing 1, the interior of the housing 1 is a hollow chamber, and the chamber is divided into two parts by the filter element assembly 2, one part is an outer chamber space, and the other part is an inner chamber space, the outer chamber space is the part between the housing 1 and the filter element assembly 2, and the inner chamber space is the part inside the filter element assembly 2. The housing is provided with a drainage member installation part connected to the drainage member, and the drainage member installation part is any structure on the housing that can be used to install the drainage member, such as a through hole, an internal threaded hole, an external threaded wall, etc. Figure 1 In one example shown, the drain installation portion 11 is a through hole. The filter element assembly includes a central component, a filter medium and a medium carrier. The filter medium is a structure for filtering fluid. The filter medium surrounds the central component and can be a filter paper in an existing filter or any other component that can achieve a filtering function, such as a folded ring structure, which can filter general hydraulic oil, hydraulic oil, emulsion, water-ethylene glycol and other liquids, and can also filter gas. The material can be selected from the material of the existing filter paper, such as a porous pad, for example Figure 1 The filter medium 4 shown is filter paper. The medium carrier is connected to the central component and is any structure that can fix the filter medium, such as a closed end cap or rubber ring in an existing filter or an open end cap (for example, a structure with holes or channels on the end cap to allow fluid to pass through the end cap), etc. Figure 1 In one example shown, the medium carrier 5 is a closed end cap. The central component includes a connection cover and a central tube, which are integrally formed or separately connected. The central component is provided with a fluid inlet and a fluid outlet, which can be provided on the connection cover at the same time or separately on the connection cover or the central tube. The fluid inlet is the inlet for the fluid to enter the filter device from the filter head, and the fluid outlet is the outlet for the fluid to return from the filter device to the filter device, such as Figure 2 and 3 As shown, the flow path of the fluid in the filter device can be from the filter head through the fluid inlet, the outer cavity space, the inner cavity space, the fluid outlet and then back to the filter head, or from the filter head through the fluid inlet, the inner cavity space, the outer cavity space, the fluid outlet and then back to the filter head; the central component is provided with a discharge part, and the discharge part is arranged inside the central component or extends toward the outside of the central component. The discharge part is any structure that can discharge the fluid in the central component when the fluid in the filter device needs to be discharged. The discharge part realizes the above function by providing a discharge channel that allows the fluid to enter the outer cavity space from the inner cavity space or enter the discharge member from the inner cavity space. The discharge channel is a hole structure or the discharge channel is provided with a fluid conveying component, such as Figure 5In one example shown, the discharge portion is a platform arranged radially in the center tube and an internal thread is provided on the inner wall of the center tube. Figure 1 In one example shown, the discharge portion 9 is disposed inside the central component, and the discharge portion 9 has a side wall extending along the inside of the central tube 7 and a dome connected to the side wall, and a through hole is provided in the middle of the dome, and the through hole is a discharge channel 10; in another example Figure 4 In another example shown, the discharge portion 9 extends toward the outside of the central component, and the discharge portion 9 has a side wall extending along the outer wall of the central tube 7 and a dome connected to the central tube, and a through hole is provided in the middle of the dome, and the through hole is a discharge channel 10; the fluid conveying component is a structure capable of conveying fluid, such as a pump, a valve, a pipeline, etc. The discharge piece is detachably connected to the discharge portion, and the detachable connection method is, for example, threaded connection, riveting, bonding, plug-in connection, etc. The discharge piece and the filter element assembly form a detachable seal, and the detachable seal is formed between the discharge piece and the filter element assembly after the discharge piece and the discharge portion of the filter element assembly are connected and fixed, and when the discharge piece and the discharge portion of the filter element assembly are completely disconnected or partially disconnected, the discharge piece and the filter element assembly are no longer sealed, and the fluid in the filter device can be discharged.

[0049] In a preferred embodiment, Figure 1 As shown, the filter device includes a housing 1, a drain member 3, a filter medium 4, a medium carrier 5, a central tube 7 and a connection cover 8. The housing 1 is generally a cylindrical shell, the bottom of the housing 1 is an arc surface, a drain member installation portion 11 is provided at the center of the bottom of the housing 1, and a through hole is provided in the drain member installation portion 11. The drain member 3 is installed in the through hole of the drain member installation portion 11, and the structure of the drain member 3 is not limited, such as Figure 1 In one example shown, the drainage member 3 is a syringe-type structure, and an external thread is provided at the end of the drainage member 3. A sealing groove for accommodating a sealing member is provided on the drainage member 3 to achieve sealing with the drainage member mounting portion 11. Other optional sealing methods can be used for the above-mentioned sealing, for example, a sealing groove is provided at the drainage member mounting portion 11. More preferably, a sealing groove is provided at the end face of the drainage member mounting portion 11 to achieve end face sealing. Another example is a sleeve sealing member. The filter medium 4 is arranged in the outer shell 1. The filter medium 4 is arranged around the central tube 7 and is an annular filter paper made of a porous gasket. The filter medium 4 is fixedly connected to the medium carrier 5 and the connecting cover 8 by adhesive. The drainage member 3 is connected to the central tube 7 by threads. The central tube 7 is provided with a discharge portion 9 extending along the inside. The discharge portion 9 is provided with an internal thread. The discharge portion 9 is threaded to fasten the drainage member 3. The medium carrier 5 and the connecting cover 8 are respectively arranged at both ends of the central tube 7 and fixedly connected to the central tube 7. To further ensure the sealing effect, the medium carrier 5 and the central tube 7 and the connecting cover 8 and the central tube 7 are sealed by sealant. As shown in FIG. Figure 1 and 2As shown, the medium carrier 5 adopts a closed end cap structure, and the connecting cover 8 adopts an open end cap structure. The connecting cover 8 is provided with a fluid inlet and a fluid outlet. The discharge portion 9 has an opening, which allows the fluid to enter the outer cavity space from the inner cavity space. The opening is a discharge channel 10. The medium carrier 5 or the central tube 7 is provided with a sealing portion 12 that can seal the discharge member 3. The sealing portion 12 is located at the bottom of the discharge portion 9. Other optional sealing methods can be used for the above sealing, such as Figure 1 In one example shown, the sealing portion 12 is a vertical annular wall on the medium carrier 5, and an annular groove is provided at the bottom of the annular wall for accommodating the sealing member of the sealing drain member 3; Fig.10 In one example shown, the sealing portion 12 is the inner wall of the central tube 7, and an annular groove is provided on the inner wall to accommodate the sealing member of the sealing drain member 3. Preferably, a sealing groove is provided on the end face of the sealing portion 12 to achieve end face sealing. Preferably, in order to facilitate the discharge of waste fluid in the sealing portion 12 and the discharge portion 9, a drainage guide structure 13 is provided on the annular wall, such as Figure 1 In one example shown, a vertical groove is provided on the surface of the annular wall as the drainage guide structure 13 .

[0050] In a preferred embodiment, Figure 4 As shown, the filter device includes a housing 1, a drain member 3, a filter medium 4, a medium carrier 5, a central tube 7 and a connection cover 8. The housing 1 is generally a cylindrical shell, the bottom of the housing 1 is an arc surface, a drain member installation portion 11 is provided at the center of the bottom of the housing 1, and a through hole is provided in the drain member installation portion 11. The drain member 3 is installed in the through hole of the drain member installation portion 11, and the structure of the drain member 3 is not limited. For example, the drain member 3 is a cylindrical structure, the end of the drain member 3 is provided with an external thread, and the drain member 3 is provided with a sealing groove for accommodating a sealing member to achieve sealing with the drain member installation portion 11. Other optional sealing methods can be used for the above-mentioned sealing, for example, the drain member installation portion 11 is provided with a sealing groove, and more preferably, the end face of the drain member installation portion 11 is provided with a sealing groove to achieve end face sealing, and another example is provided with a sealing member. The filter medium 4 is arranged in the housing 1, and the filter medium 4 is arranged around the central tube 7 and is an annular filter paper made of a porous liner. The filter medium 4 is fixedly connected to the medium carrier 5 and the connection cover 8 by adhesive. The discharge member 3 is connected to the central tube 7 by threads. The central tube 7 is provided with a discharge portion 9 extending along the outside. The discharge portion 9 is provided with internal threads. The discharge portion 9 is threadedly fastened to the discharge member 3. The medium bearing member 5 and the connection cover 8 are respectively arranged at both ends of the central tube 7 and fixedly connected to the central tube 7. To further ensure the sealing effect, the medium bearing member 5 and the central tube 7 as well as the connection cover 8 and the central tube 7 are sealed by sealant. Figure 1 and 2As shown, the medium carrier 5 adopts a closed end cap structure, and the connecting cover 8 adopts an open end cap structure. The connecting cover 8 is provided with a fluid inlet and a fluid outlet. The discharge portion 9 has an opening, which allows the fluid to enter the outer cavity space from the inner cavity space. The opening is a discharge channel 10. The central tube 7 is provided with a sealing portion 12 that can seal the discharge member 3. The sealing portion 12 is located at the bottom of the discharge portion 9. Other optional sealing methods can be used for the above sealing, such as Figure 4 In one example shown, the sealing portion 12 is the inner wall of the central tube 7, and an annular groove is provided on the inner wall to accommodate the sealing member of the sealing drainage member 3. Preferably, a sealing groove is provided on the end face of the sealing portion 12 to achieve end face sealing. Preferably, in order to facilitate the discharge of waste fluid in the sealing portion 12 and the discharge portion 9, a drainage guide structure 13 is provided on the annular wall.

[0051] In a preferred embodiment, the housing, the drainage member, the filter medium, the medium carrier, the central tube and the connection cover can adopt the structure of the first embodiment or the structure of the second embodiment. The drainage member is provided with a drainage channel, which is used to discharge the fluid from the central tube. Figure 1 In one example shown, the drainage channel 14 is an inner hole opened in the drainage member 3; preferably, the drainage member 3 is provided with a drainage barrier 15, and the drainage barrier 15 is used to seal between the drainage member 3 and the discharge portion 9 when the drainage member 3 is fixedly connected to the discharge portion 9. Figure 1 In one example shown, the drainage barrier 15 is disposed at the top of the drainage channel 14, and the drainage barrier 15 is sealed in the form of a sealing member, a sealing block or a sealing adhesive.

[0052] In a preferred embodiment, the housing, the drainage member, the filter medium, the medium carrier, the central tube and the connection cover can adopt the structure of the first embodiment or the structure of the second embodiment. The medium carrier or the central component is provided with a siphon wall, and the siphon wall and the drainage member mounting portion cooperate to generate a siphon, such as Figure 6 In one example shown, the siphon wall 16 is an annular wall extending outward from the surface of the medium carrier. Figure 7 In one example shown, the siphon wall 16 is an annular wall extending outward from the surface of the central pipe 7 .

[0053] In a preferred embodiment, the housing, the drainage member, the filter medium, the medium carrier, the central tube and the connection cover can adopt the structure of the first embodiment or the structure of the second embodiment, which is basically the same as the above-mentioned embodiment. The sealing between the drainage member installation part and the drainage member is sealed by a No. 1 sealing member, which can be arranged on the drainage member installation part or on the drainage member.

[0054] In a preferred embodiment, the housing, the drainage member, the filter medium, the medium carrier, the central tube and the connection cover can adopt the structure of the first embodiment or the structure of the second embodiment, which is basically the same as the above-mentioned embodiment. The sealing between the sealing part and the drainage member is sealed by a second sealing member, which can be arranged on the sealing part or on the drainage member.

[0055] In a preferred embodiment, which is basically the same as the aforementioned embodiment, the housing, the drainage member, the filter medium, the medium carrier, the central tube and the connection cover can adopt the structure of the first embodiment or the structure of the second embodiment. In order to recycle the medium carrier and the connection cover and realize the function of only replacing the filter medium when replacing the filter device, the filter medium is detachable, and a medium seal is provided between the medium carrier and the filter medium and between the central component and the filter medium. The medium seal is detachable relative to the medium carrier and the connection cover, and the filter medium is fixed between the medium seals. Figure 5 In one example shown, the medium seal 19 is an elastic seal, the medium seal 19 is bonded to both ends of the filter medium 4, and the medium seal 19 is inserted into the space defined between the medium carrier and the connection cover.

[0056] In a preferred embodiment, the housing, the drain, the filter medium, the medium carrier, the central tube and the connection cover can adopt the structure of the first embodiment or the structure of the second embodiment. The connection cover is provided with an external connection part with a protruding surface, and the external connection part is used to cooperate with the elastic plug in the filter head, and the external connection part pushes the elastic plug to allow the fluid to enter or flow out of the filter head. Figure 1 In one example shown, a truncated cone-shaped external connection portion 20 is disposed in the middle of the connection cover, and an opening is disposed on the external connection portion 20 for fluid to pass through. Figure 4 In one example shown, an outer connection portion 20 having a boss-shaped structure is provided at the edge of the connection cover.

[0057] In a preferred embodiment, which is basically the same as the above-mentioned embodiment, the housing, the drainage member, the filter medium, the medium carrier, the central tube and the connection cover can adopt the structure of the first embodiment or the structure of the second embodiment. In order to prevent the fluid to be filtered from entering the central tube from the fluid outlet, the above problem can be solved by providing a covering member, which can detachably cover the fluid outlet. Fig. 9 In one example shown, the covering member 21 is a truncated cone-shaped structure, which covers the external portion 20 and is manually installed and removed.

[0058] The working principle of the filter device is as follows: when the filter device is installed, the drain member passes through the drain member installation portion into the housing and is screwed into the thread of the discharge portion. The No. 1 seal on the drain member can achieve the seal between the drain member installation portion and the drain member, and the drain member is fixed on the central tube. After the drain member is fastened in place, the entrance of the drain channel is located in the sealing portion, and the No. 2 seal on the sealing portion can seal the drain channel on the drain member. After the drain member is fastened in place, the drain barrier member abuts against the discharge channel, and the drain barrier member on the drain member can seal the discharge channel on the discharge portion, so that the inner cavity space is not connected to the outer cavity space, and the fluid cannot enter the outer cavity space from the inner cavity space. Preferably, before the first injection of fluid, the fluid outlet is first covered with a covering member, and then the fluid is injected into the fluid inlet of the filter device. Since the drain channel and the discharge channel are both sealed, the fluid in the housing and the central tube will not flow out of the drain channel. When it is necessary to discharge the waste fluid, as long as the drainage piece is twisted, the drainage barrier will no longer resist the discharge channel and the No. 2 seal will no longer seal the drainage piece, and the drainage piece will immediately break away from the sealed state, the discharge channel will be in an open state, the inner cavity space will be connected with the outer cavity space, the fluid can enter the outer cavity space from the inner cavity space, and the drainage guide structure can guide the fluid in the inner cavity space and the outer cavity space into the drainage channel of the drainage piece to achieve drainage. During the operation of the filter device, the fluid will exert an axial force on the drainage piece. Since the drainage piece is fixed by the central tube, the axial force on the drainage piece will be borne by the central tube, and will not be directly transmitted to the connecting cover and the medium carrier, and then will not be transmitted to the filter medium, and the phenomenon that the filter medium in the existing filter is deformed by force, resulting in reduced filtration performance or even failure will not occur.

[0059] like Figure 1 As shown, a filtering system includes a filter head and a filtering device. The filter head can use the filter head structure in the existing filter, and the filter head is provided with a filtering outlet and a filtering inlet that match the fluid outlet and the fluid inlet. The filtering device includes a housing, a filter element assembly and a liquid discharge member. The housing can use the housing structure of the existing filter, and the housing can adopt the housing structure of the conventional spin-on filter, such as a cylindrical housing structure. The material can be selected from existing materials, such as aluminum alloy, steel, glass fiber, etc. Figure 1 As shown, a structure of the housing 1 is shown. The space between the housing and the filter element assembly is the outer cavity space of the filter device, and the space inside the filter element assembly is the inner cavity space of the filter device. The outer cavity space and the inner cavity space can be used to accommodate fluid when the filter is in use, such as Figure 2 and 3In one example shown, the filter element assembly 2 is installed in the housing 1, the interior of the housing 1 is a hollow chamber, and the chamber is divided into two parts by the filter element assembly 2, one part is an outer chamber space, and the other part is an inner chamber space, the outer chamber space is the part between the housing 1 and the filter element assembly 2, and the inner chamber space is the part inside the filter element assembly 2. The housing is provided with a drainage member installation part connected to the drainage member, and the drainage member installation part is any structure on the housing that can be used to install the drainage member, such as a through hole, an internal threaded hole, an external threaded wall, etc. Figure 1 In one example shown, the drain installation portion 11 is a through hole. The filter element assembly includes a central component, a filter medium and a medium carrier. The filter medium is a structure for filtering fluid. The filter medium surrounds the central component and can be a filter paper in an existing filter or any other component that can achieve a filtering function, such as a folded ring structure, which can filter general hydraulic oil, hydraulic oil, emulsion, water-ethylene glycol and other liquids, and can also filter gas. The material can be selected from the material of the existing filter paper, such as a porous pad, for example Figure 1 The filter medium 4 shown is filter paper. The medium carrier is connected to the central component and is any structure that can fix the filter medium, such as a closed end cap or rubber ring in an existing filter or an open end cap (for example, a structure with holes or channels on the end cap to allow fluid to pass through the end cap), etc. Figure 1 In one example shown, the medium carrier 5 is a closed end cap. The central component includes a connection cover and a central tube, which are integrally formed or separately connected. The central component is provided with a fluid inlet and a fluid outlet, which can be provided on the connection cover at the same time or separately on the connection cover or the central tube. The fluid inlet is the inlet for the fluid to enter the filter device from the filter head, and the fluid outlet is the outlet for the fluid to return from the filter device to the filter device, such as Figure 2 and 3 As shown, the flow path of the fluid in the filter device can be from the filter head through the fluid inlet, the outer cavity space, the inner cavity space, the fluid outlet and then back to the filter head, or from the filter head through the fluid inlet, the inner cavity space, the outer cavity space, the fluid outlet and then back to the filter head; the central component is provided with a discharge portion, and the discharge portion is arranged inside the central component or extends toward the outside of the central component. The discharge portion is any structure that can discharge the fluid in the central component when the waste fluid in the filter device needs to be discharged. The discharge portion achieves the above function by providing a discharge channel that allows the fluid to enter the outer cavity space from the inner cavity space or enter the discharge member from the inner cavity space. The discharge channel is a hole structure or the discharge channel is provided with a fluid conveying component. For example, the discharge portion is a platform arranged radially in the central tube and an internal thread is provided on the inner wall of the central tube. For example Figure 1 In one example shown, the discharge portion 9 is disposed inside the central component, and the discharge portion 9 has a side wall extending along the inside of the central tube 7 and a dome connected to the side wall, and a through hole is provided in the middle of the dome, and the through hole is a discharge channel 10; in another example Figure 4 In another example shown, the discharge portion 9 extends toward the outside of the central component, and the discharge portion 9 has a side wall extending along the outer wall of the central tube 7 and a dome connected to the central tube, and a through hole is provided in the middle of the dome, and the through hole is a discharge channel 10; the fluid conveying component is a structure capable of conveying fluid, such as a pump, a valve, a pipeline, etc. The discharge piece is detachably connected to the discharge portion, and the detachable connection method is, for example, threaded connection, riveting, bonding, plug-in connection, etc. The discharge piece and the filter element assembly form a detachable seal, and the detachable seal is formed between the discharge piece and the filter element assembly after the discharge piece and the discharge portion of the filter element assembly are connected and fixed, and when the discharge piece and the discharge portion of the filter element assembly are completely disconnected or partially disconnected, the discharge piece and the filter element assembly are no longer sealed.

[0060] In a preferred embodiment, Figure 1 In one example shown, the filter head is provided with a filter outlet 22 and a filter inlet 23 that cooperate with the fluid outlet and the fluid inlet, and an elastic plug 24 is provided in the filter outlet 22. The elastic plug 24 is used to close the filter outlet 22 when the filter device is not installed to prevent contamination of the filter outlet 22. The third seal 25 and the fourth seal 26 are both arranged on the connection cover 8, and a detachable seal is formed between the housing and the central component by the third seal, and a detachable seal is formed between the filter head and the central component by the fourth seal.

[0061] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different. Any equivalent or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A filtering device, characterized in that: It includes a filter element assembly, a housing and a liquid discharge part, an outer cavity space of a filter device is provided between the housing and the filter element assembly, and an inner cavity space of a filter device is provided inside the filter element assembly; The housing is provided with a liquid discharge member installation portion connected to the liquid discharge member; The filter element assembly comprises a central component, a filter medium and a medium carrier, wherein the filter medium surrounds the central component, the medium carrier is connected to the central component and is used to fix the filter medium, the central component is provided with a discharge portion, a fluid inlet and a fluid outlet, and the discharge portion is provided with a discharge channel allowing the fluid to enter the outer cavity space from the inner cavity space or enter the discharge member from the inner cavity space; The drain piece is detachably connected to the discharge portion, and the drain piece and the filter element assembly form a detachable seal.

2. The filtering device according to claim 1, characterized in that: The discharge portion is arranged inside the central component or extends toward the outside of the central component, and the discharge channel is a hole structure or the discharge channel is provided with a fluid conveying component.

3. The filtering device according to claim 1, characterized in that: The central component includes a connecting cover and a central tube, which are integrally formed or separately connected. The connecting cover or the central tube is provided with an external connection portion with a protruding surface, and at least part of the external connection portion is located above the central tube or the fluid inlet or fluid outlet.

4. The filtering device according to claim 1, characterized in that: The medium bearing member is provided with a sealing part, the sealing part is connected to the central pipe member, the sealing part and the liquid discharge member form a detachable seal, and the sealing part is provided with a liquid discharge guiding structure.

5. The filtering device according to claim 1, characterized in that: The central component is provided with a sealing portion, which forms a detachable seal with the drainage member, and the sealing portion is provided with a drainage guiding structure.

6. The filtering device according to claim 1, characterized in that: The drainage member is provided with a drainage channel and a drainage barrier. The drainage member can detachably seal the discharge portion through the drainage barrier, and the filter element assembly can detachably seal the drainage channel.

7. The filtering device according to claim 1, characterized in that: The medium bearing member or the central member is provided with a siphon wall, and the siphon wall and the liquid discharge member mounting portion cooperate to generate a siphon.

8. The filtering device according to claim 1, characterized in that: It comprises a No. 1 sealing member, which is arranged on the drainage member installation part or on the drainage member, and a detachable seal is formed between the drainage member installation part and the drainage member through the No. 1 sealing member.

9. The filtering device according to claim 1, characterized in that: A cover member is included that removably covers the fluid outlet.

10. The filtering device according to claim 1, characterized in that: The filter element assembly further comprises a media seal, which is disposed between the media carrier and the filter medium and between the central component and the filter medium. The media seal detachably connects the media carrier and the central component.

11. The filtering device according to claim 4 or 5, characterized in that: It comprises a No.2 sealing member, which is arranged on the sealing part or the liquid discharge member, and a detachable seal is formed between the sealing part and the liquid discharge member through the No.2 sealing member.

12. The filtering device according to claim 8, characterized in that: The seal formed by the first seal is an end face seal.

13. The filtering device according to claim 11, characterized in that: The seal formed by the second seal is an end face seal.

14. A filtration system, comprising a filter head, a filtration device as described in any one of claims 1 to 13, a No. 3 seal and a No. 4 seal, wherein the No. 3 seal is arranged on the outer shell or the central component, and the No. 4 seal is arranged on the filter head or the central component, a detachable seal is formed between the outer shell and the central component by the No. 3 seal, and a detachable seal is formed between the filter head and the central component by the No. 4 seal.

15. The filtration system according to claim 14, characterized in that: The filter head is provided with a filter outlet and a filter inlet which cooperate with the fluid outlet and the fluid inlet, and the filter head is provided with an elastic member which covers the filter outlet or the filter inlet.

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