CN217354956U - Filter device with heater, hydraulic system and engineering mechanical equipment - Google Patents

Abstract

The utility model discloses a filter device with a heater, a hydraulic system and engineering mechanical equipment, the filter device with the heater comprises a filter shell, an annular filter element and a heater, the filter shell encloses to form a filter cavity and is provided with an oil inlet and an oil outlet, the annular filter element is arranged in the filter cavity and divides the filter cavity into an inner cavity and an outer cavity, the inner cavity is arranged at the inner side of the annular filter element, one of the oil inlet and the oil outlet is correspondingly communicated with the inner cavity, the other one is correspondingly communicated with the outer cavity, the heater is arranged on the filter shell and extends into the inner cavity or the outer cavity, compared with the mode that the heater is arranged in the oil tank to heat all oil liquid, the heater in the utility model only needs to heat the oil liquid entering the filter cavity of the filter device, does not need to use a large-power heater, achieves the purpose of reducing the manufacturing cost, and can also shorten the heating time of the heater, the purpose of improving the construction efficiency is achieved.

Description

Filter device with heater, hydraulic system and engineering mechanical equipment

Technical Field

The utility model belongs to the technical field of the hydraulic oil heating, concretely relates to take filter equipment, hydraulic system and engineering machine tool equipment of heater.

Background

In engineering machinery, a hydraulic system is widely applied, and most of execution machinery is driven by the hydraulic system. Some construction machines need to be constructed in cold climates, and the hydraulic system is required to adapt to low-temperature environments. In low temperature environments, hydraulic oil viscosity is the most important parameter affecting hydraulic systems. The lower the temperature, the greater the hydraulic oil viscosity. When the viscosity of the hydraulic oil is too high, the hydraulic pump is difficult to absorb oil, the phenomenon of air suction is generated, and the hydraulic pump is abraded or damaged. Therefore, in a low-temperature environment, measures are taken to control the viscosity of the hydraulic oil within a suitable range.

In the prior art, a heater is generally arranged in an oil tank, the heater heats hydraulic oil in the oil tank to a set temperature, and then a hydraulic system is started. However, in this heating method, all the hydraulic oil in the oil tank needs to be heated to a certain temperature, so that a high-power heater is needed, the price is high, and meanwhile, when the heating power is limited, the heating time is long, and the construction efficiency is affected.

SUMMERY OF THE UTILITY MODEL

To foretell defect or not enough, the utility model provides a take filter equipment, hydraulic system and engineering machine tool equipment of heater aims at solving current hydraulic oil heating methods and needs high-power heater to lead to manufacturing cost higher or can be because of the longer technical problem who influences the efficiency of construction that leads to of heating time when heating power is limited.

In order to achieve the above object, the present invention provides a filter device with a heater, wherein the filter device with a heater comprises a filter housing, an annular filter element and a heater, the filter housing encloses to form a filter cavity and is provided with an oil inlet and an oil outlet; the annular filter element is arranged in the filter cavity and divides the filter cavity into an inner cavity and an outer cavity, the inner cavity is positioned at the inner side of the annular filter element, one of the oil inlet and the oil outlet is correspondingly communicated with the inner cavity, and the other one is correspondingly communicated with the outer cavity; the heater is mounted on the filter housing and extends into the inner chamber or the outer chamber.

In the embodiment of the utility model, the heater stretches into the inner chamber setting.

The embodiment of the utility model provides an in, the oil inlet includes corresponds the oil return opening that the intercommunication set up and corresponds the oil absorption opening that the intercommunication set up with the exocoel, and oil return opening and oil-out are all seted up in the upper end of filtering the casing, and the oil-out corresponds the intercommunication setting with the inner chamber, and the oil absorption opening is seted up on the diapire of the lower extreme of filtering the casing, and filter equipment still includes the oil return check valve, and the one end and the oil absorption opening intercommunication of oil return check valve, the other end are used for being connected with the oil tank.

The embodiment of the utility model provides an in, filter equipment still includes the oil absorption check valve with the parallel setting of oil return check valve, the one end and the oil absorption mouth intercommunication of oil absorption check valve, the other end is used for being connected with the oil tank.

The embodiment of the utility model provides an in, filter the casing including filtering the aircraft nose and the filtration barrel of being connected with filtering the aircraft nose, the one end and the filter head of cyclic annular filter core are connected, the other end stretches into in the cartridge filter body and is connected with the diapire of filtering the barrel, the oil absorption mouth has been seted up to the inboard region that the diapire of filtering the barrel corresponds cyclic annular filter core, filter and seted up oil return opening and oil-out on the outside region that the aircraft nose corresponds cyclic annular filter core, and cyclic annular filter core seals filtering the barrel on the position that corresponds with the oil-out, it still is formed with the first oilhole of crossing of intercommunication inner chamber and oil-out to filter the aircraft nose on the position of being connected with cyclic annular filter core, the heater is installed and is stretched into in the inner chamber on the filter head.

The embodiment of the utility model provides an in, cyclic annular filter core includes upper end cover, lower extreme cover and core body, and the upper end cover is connected with the filter head to the upper end cover seals the filter cylinder body on the position that corresponds with the oil-out, and the core body is installed between upper end cover and lower extreme cover and is located the cartridge filter body, and the lower extreme cover is connected with the diapire of filtering the cylinder body, and the heater is installed on the filter head and stretches into in the core body from the upper end cover.

The embodiment of the utility model provides an in, filter the aircraft nose and include the roof, encircle the periphery curb plate that the roof set up and set up on the roof and be located the inboard interior curb plate of periphery curb plate, filter the upper end and the periphery curb plate circumferential connection of barrel, oil return opening and oil-out have been seted up respectively to the relative both sides of periphery curb plate, interior periphery curb plate and cyclic annular filter core circumferential connection to first oilhole has been seted up in one side that interior periphery curb plate set up relatively with the oil-out.

In an embodiment of the present invention, the filtering device further includes a temperature sensor extending into the filtering chamber.

In order to achieve the above object, the present invention also provides a hydraulic system, wherein the hydraulic system comprises a filter device with a heater according to the above.

In order to achieve the above object, the present invention also provides an engineering mechanical device, wherein the engineering mechanical device comprises the hydraulic system according to the above.

Through the technical scheme, the embodiment of the utility model provides a filter equipment with heater has following beneficial effect:

when the filtering device with the heater is used in a hydraulic system, the annular filter element divides the filtering cavity of the filtering shell into an inner cavity and an outer cavity, and when the oil inlet is formed in the position, corresponding to the inner cavity, of the filtering shell and the oil outlet is formed in the position, corresponding to the outer cavity, of the filtering shell, the oil can firstly enter the inner cavity from the oil inlet, then enter the outer cavity through the filtering of the annular filter element and finally flow out from the oil outlet; when the oil inlet is arranged on the position of the filtering shell correspondingly communicated with the outer cavity and the oil outlet is arranged on the position of the filtering shell correspondingly communicated with the inner cavity, the oil liquid can firstly enter the outer cavity through the oil inlet, then enter the inner cavity through the filtration of the annular filter element and finally flow out of the oil outlet, the two setting modes can both play a role of filtering the oil liquid, in addition, because the heater stretches into in inner chamber or exocoel, then the heater can heat the fluid that flows into in the filter chamber, compare in the mode that heats all fluid with the heater setting in the oil tank, the utility model provides a heater only need heat the fluid that gets into filter equipment's filter chamber, need not to use powerful heater, has reached reduction in manufacturing cost's purpose to when also can shortening the heating of heater, reached the purpose that improves the efficiency of construction.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention, but do not constitute a limitation of the invention. In the drawings:

fig. 1 is a schematic structural view of a filtering apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a filtering apparatus according to another embodiment of the present invention;

fig. 3 is a schematic view illustrating a control principle of the oil return check valve and the oil suction check valve in fig. 2.

Description of the reference numerals

1 Filter housing 11 Filter head

111 top plate 112 outer peripheral side plate

113 inner peripheral side plate 114 first oil passing hole

12 filtering cylinder 13 mounting cylinder

14 inner chamber and 15 outer chamber

2 annular filter element 21 upper end cover

211 annular connection 212 cover body

213 second oil passing hole 22 core body

23 lower end cover 3 heater

4 oil return check valve 5 oil suction check valve

6 temperature sensor R/T oil inlet

T oil suction port S oil outlet

R oil return port

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It should be understood that the description herein of specific embodiments is for purposes of illustration and explanation only and is not intended to limit the invention.

The filtering apparatus with a heater according to the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides a take filter equipment of heater, wherein, take filter equipment of heater includes:

the filter shell 1 is enclosed to form a filter cavity and is provided with an oil inlet R/T and an oil outlet S;

the annular filter element 2 is arranged in the filter cavity and divides the filter cavity into an inner cavity 14 and an outer cavity 15, the inner cavity 14 is positioned at the inner side of the annular filter element 2, one of the oil inlet R/T and the oil outlet S is correspondingly communicated with the inner cavity 14, and the other one is correspondingly communicated with the outer cavity 15; and

and the heater 3 is arranged on the filter shell 1 and extends into the inner cavity 14 or the outer cavity 15.

When the filtering device with the heater is used in a hydraulic system, the annular filter element 2 divides the filtering cavity of the filtering shell 1 into an inner cavity 14 and an outer cavity 15, when the oil inlet R/T is arranged on the position, correspondingly communicated with the inner cavity 14, on the filtering shell 1 and the oil outlet S is arranged on the position, correspondingly communicated with the outer cavity 15, on the filtering shell 1, oil can firstly enter the inner cavity 14 from the oil inlet R/T, then enter the outer cavity 15 through the filtering of the annular filter element 2 and finally flow out from the oil outlet S; when the oil inlet R/T is arranged on the position of the filtering shell 1 which is correspondingly communicated with the outer cavity 15 and the oil outlet S is arranged on the position of the filtering shell 1 which is correspondingly communicated with the inner cavity 14, oil can firstly enter the outer cavity 15 through the oil inlet R/T, then enter the inner cavity 14 through the filtering of the annular filter element 2 and finally flow out of the oil outlet S, the two setting modes can play a role of filtering the oil, in addition, because the heater 3 extends into the inner cavity 14 or the outer cavity 15, the heater 3 can heat the oil flowing into the filtering cavity, compared with the mode of arranging the heater 3 in the oil tank to heat all the oil, the heater 3 in the utility model only needs to heat the oil entering the filtering cavity of the filtering device, does not need to use a high-power heater 3, and achieves the purpose of reducing the manufacturing cost, and the heating time of the heater 3 can be shortened, and the aim of improving the construction efficiency is fulfilled.

It should be particularly noted that, the utility model provides a take filter equipment of heater can set up on hydraulic system 'S oil feed oil circuit, see fig. 1, oil inlet R/T connects hydraulic system' S oil tank, oil-out S connects the hydraulic pump, be equivalent to installed heater 3 in the oil absorption filter, also can set up on hydraulic system 'S oil return oil circuit, see fig. 2, oil return port R as oil inlet R/T connects hydraulic system' S oil return end, oil-out S connects the hydraulic pump, be equivalent to installed heater 3 in the oil return filter.

In the embodiment of the present invention, the heater 3 extends into the inner cavity 14. The outer cavity 15 is located outside the annular filter element 2 and is an annular space, if the heater 3 is inserted into the outer cavity 15, in order to ensure the uniformity of heating, a plurality of heaters 3 need to be uniformly arranged in the outer cavity 15, the inner cavity 14 is located inside the annular filter element 2, and the purpose of uniformity of heating can be met by arranging one heater 3 in the middle of the inner cavity 14. In addition, oil can be exchanged between the inner chamber 14 and the outer chamber 15, and the heater 3 can heat the oil in the whole filter chamber.

As shown in fig. 2 and 3, in the embodiment of the present invention, the oil inlet R/T includes an oil return port R corresponding to the communication setting with the outer cavity 15 and an oil suction port T corresponding to the communication setting with the inner cavity 14, the oil return port R and the oil outlet S are all set up at the upper end of the filtering casing 1, the oil outlet S corresponds to the communication setting with the inner cavity 14, the oil suction port T is set up on the bottom wall of the lower end of the filtering casing 1, the filtering apparatus further includes an oil return check valve 4, one end of the oil return check valve 4 communicates with the oil suction port T, and the other end is used for being connected with the oil tank. It should be particularly noted that the utility model provides a take filter equipment of heater is especially for setting up on hydraulic system ' S oil return oil circuit to set up oil inlet R/T ' S quantity into two, an oil inlet R/T is oil return R, and another oil inlet R/T is oil absorption T, and oil return R connects hydraulic system ' S oil return end, and oil absorption T connects the oil tank, and oil-out S connects the hydraulic pump, has installed heater 3 in oil return filter in other words. In addition, as the return oil R and the outer cavity 15 are correspondingly communicated, the return oil of the hydraulic system can enter the outer cavity 15 from the oil return port R, then the return oil entering the outer cavity 15 can enter the inner cavity 14 through the annular filter element 2, the heater 3 extending into the inner cavity 14 can heat the oil in the filtering cavity, the oil outlet S and the oil suction port T are respectively and correspondingly communicated with the inner cavity 14, finally, part of the return oil in the inner cavity 14 can flow to the hydraulic pump through the oil outlet S, and part of the return oil in the inner cavity 14 can flow to the oil tank through the oil suction port T. In addition, the oil suction port T is correspondingly provided with an oil return one-way valve 4 connected with the oil tank, when the oil return flow is larger than the flow required by the hydraulic pump, the oil return one-way valve 4 is opened, and the return oil in the inner cavity 14 can flow out of the oil suction port T to the oil tank through the oil return one-way valve 4.

The embodiment of the utility model provides an in, filter equipment still includes the oil absorption check valve 5 with the parallel setting of oil return check valve 4, the one end and the oil absorption mouth T intercommunication of oil absorption check valve 5, the other end is used for being connected with the oil tank. When the return oil flow is smaller than the flow required by the hydraulic pump or the filter element is blocked, the oil suction one-way valve 5 is opened to form negative pressure, so that the oil in the oil tank can flow into the inner cavity 14 from the oil suction port T through the oil suction one-way valve 5, the flow required by the hydraulic pump can be supplemented, and the phenomenon of air suction of the hydraulic pump is effectively prevented. Specifically, the oil suction one-way valve 5 and the oil return one-way valve 4 are both connected with the inner cavity 14 and the oil tank, but the flow directions of the oil liquid controlled by the oil suction one-way valve 5 and the oil return one-way valve 4 are opposite, the oil return one-way valve 4 controls the oil liquid in the inner cavity 14 to flow to the oil tank, and the oil suction one-way valve 5 controls the oil liquid in the oil tank to flow to the inner cavity 14. More specifically, the oil suction port T, the oil suction one-way valve 5 and the oil return one-way valve 4 may be connected by a three-way joint, and the filter housing 1 further includes a mounting cylinder 13 connected to the lower end of the filter cylinder 12, the oil suction one-way valve 5 and the oil return one-way valve 4 being disposed in the mounting cylinder 13.

The embodiment of the utility model provides an in, filter casing 1 including filter head 11 and the filtration barrel 12 of being connected with filter head 11, the one end and the filtration head 11 of cyclic annular filter core 2 are connected, the other end stretch into filter barrel 12 in and be connected with the diapire that filters barrel 12, filter casing 1 promptly for will filter head 11 and filter barrel 12 equipment preparation form, then be convenient for carry out the dismouting to the cyclic annular filter core 2 of placing in the filter chamber. In addition, the bottom wall of the filtering cylinder 12 is provided with an oil suction port T corresponding to the inner side area of the annular filter element 2, the inner cavity 14 is correspondingly communicated with the oil suction port T, the filter head 11 is provided with an oil return port R and an oil outlet S corresponding to the outer side area of the annular filter element 2, the oil return port R is correspondingly communicated with the outer cavity 15, the outer cavity 15 is always kept in an unsealed state at a position corresponding to the oil return port R, return oil of a hydraulic system can be smoothly injected into the outer cavity 15 from the oil return port R, but the annular filter element 2 seals the filtering cylinder 12 at a position corresponding to the oil outlet S, that is, the annular filter element 2 can separate the outer cavity 15 at a position corresponding to the oil outlet S and seal the filtering cylinder 12 corresponding to the oil outlet S, specifically, the annular filter element 2 can be provided with a sealing plate for sealing the filtering cylinder 12 at a position corresponding to the oil outlet S, a first oil passing hole 114 for communicating the inner cavity 14 and the oil outlet S is further formed at a position where the filter head 11 is connected to the annular filter element 2, so that the oil outlet S and the inner cavity 14 can be correspondingly communicated by arranging the first oil passing hole 114 and sealing the filter cylinder 12 at a position corresponding to the oil outlet S by the annular filter element 2, and part of the oil in the inner cavity 14 can flow to the oil outlet S through the first oil passing hole 114. More specifically, the heater 3 is mounted on the filter head 11 and extends into the interior chamber 14.

The embodiment of the utility model provides an in, cyclic annular filter core 2 includes upper end cover 21, lower end cover 23 and core body 22, and upper end cover 21 is connected with filtering aircraft nose 11 to upper end cover 21 seals filtering barrel 12 on the position that corresponds with oil-out S, then upper end cover 21 not only can realize being connected with filtering aircraft nose 11, can also seal filtering barrel 12 on the position that corresponds with oil-out S. In addition, the core body 22 is installed between the upper end cover 21 and the lower end cover 23 and located in the filter cylinder 12, the core body 22 can be reinforced by the upper end cover 21 and the lower end cover 23, and the lower end cover 23 is connected with the bottom wall of the filter cylinder 12, so that the bottom wall of the filter cylinder 12 can be fixed by the lower end cover 23, and the offset is avoided. Meanwhile, the heater 3 is mounted on the filter head 11 and extends from the upper end cap 21 into the cartridge body 22. Specifically, the upper end cover 21 includes a cover body 212 and an annular connecting portion 211 formed by bending upward from the inner side of the cover body 212, one end of the annular connecting portion 211, which is far away from the core body 22, is connected to the filter head 11, so as to facilitate connection of the annular filter element 2 and the filter head 11, the outer side of the cover body 212 is respectively overlapped with the inner wall of the filter head 11, and the cover body 212 is provided with a second oil passing hole 213 at a position corresponding to the oil return port R, so that return oil flowing from the oil return port R can flow into the outer cavity 15 below the cover body 212 through the second oil passing hole 213, and the cover body 212 maintains a closed state at the position corresponding to the oil outlet S.

In the embodiment of the present invention, the filter head 11 comprises a top plate 111, an outer peripheral side plate 112 disposed around the top plate 111, and an inner peripheral side plate 113 disposed on the top plate 111 and located inside the outer peripheral side plate 112, the upper end of the filter cylinder 12 is circumferentially connected to the outer peripheral side plate 112, the opposite sides of the outer peripheral side plate 112 are respectively provided with an oil return port R and an oil outlet port S, i.e., the oil outlet S and the oil return R are opened on the peripheral side of the filter head 11, and the annular connecting portion 211 of the upper end cover 21 is disposed opposite to the peripheral side plate 112, that is, the annular connection portion 211 of the upper cap 21 is disposed facing the oil outlet S and the oil return port R, and the cartridge body 22 is completely inserted into the filter cylinder 12, and further, the inner peripheral side plate 113 is circumferentially connected to the annular connection portion 211 of the annular filter cartridge 2, and the inner peripheral side plate 113 is opened with a first oil passing hole 114 on a side disposed opposite to the oil outlet S, thereby facilitating the oil in the inner chamber 14 to flow to the oil outlet S through the first oil passing hole 114.

In the embodiment of the present invention, the filtering apparatus further includes a temperature sensor 6 extending into the filtering chamber. The temperature in the filter chamber can be detected by the temperature sensor 6. Specifically, the temperature sensor 6 is mounted on the filter head 11 and is disposed near the oil outlet S into the outer chamber 15.

More specifically, the following control may be performed in accordance with the temperature detected by the temperature sensor 6:

(1) two or more temperature thresholds are preset;

(2) detecting the temperature of the oil in the filter cavity;

(3) comparing the detected oil temperature with a temperature threshold value, and determining the range of the threshold value;

(4) and determining which control strategy is adopted according to the range of the threshold value, such as stopping the hydraulic system, reducing the operation parameters of the hydraulic system, starting the heater 3, stopping the heater 3 and the like.

One control method is exemplified below.

(1) Three temperature thresholds t1, t2 and t3 are set in anticipation, wherein t1 < t3 < t 2;

(2) detecting the temperature t of the oil in the filtering cavity through a temperature sensor 6;

(3) when the temperature t is less than the set value t1, it is detected whether the hydraulic system is activated, if the hydraulic system has been activated, the hydraulic system is stopped and the heater 3 is activated (the hydraulic system is stopped, since below this temperature, the system is activated, possibly causing the hydraulic pump to empty); if the hydraulic system is not started, the heater 3 is started, the hydraulic system is prohibited from being started, and the temperature t of the oil in the filter cavity is detected again, so that circulation is performed;

(4) when the temperature t is more than or equal to t1, detecting whether t is more than or equal to t3, if yes, detecting whether t is more than or equal to t2, if t is more than or equal to t2, stopping the heater 3, and re-detecting the oil temperature t, and repeating the steps;

(5) when the temperature t is more than or equal to t1 and t is less than t3, the heater 3 is started, and the hydraulic system can be started to work;

(6) when the temperature t is more than or equal to t1, t is more than or equal to t3, and t is less than t2, the heater 3 is started, and the hydraulic system can be started to work.

In order to achieve the above object, the present invention also provides a hydraulic system, wherein the hydraulic system comprises a filter device with a heater according to the above. Since the hydraulic system adopts all technical solutions of the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated herein.

In order to achieve the above object, the present invention also provides an engineering mechanical device, wherein the engineering mechanical device comprises a hydraulic system according to the above. Since the engineering mechanical equipment adopts all the technical solutions of the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A filter device with a heater, comprising:

the filter shell (1) is enclosed to form a filter cavity and is provided with an oil inlet (R/T) and an oil outlet (S);

the annular filter element (2) is arranged in the filter cavity and divides the filter cavity into an inner cavity (14) and an outer cavity (15), the inner cavity (14) is positioned at the inner side of the annular filter element (2), one of the oil inlet (R/T) and the oil outlet (S) is correspondingly communicated with the inner cavity (14), and the other one is correspondingly communicated with the outer cavity (15); and

a heater (3) mounted on the filter housing (1) and extending into the inner chamber (14) or the outer chamber (15).

2. The filtering device with a heater according to claim 1, wherein the heater (3) is arranged to extend into the inner cavity (14).

3. The filter device with the heater according to claim 2, wherein the oil inlet (R/T) comprises an oil return port (R) correspondingly communicated with the outer cavity (15) and an oil suction port (T) correspondingly communicated with the inner cavity (14), the oil return port (R) and the oil outlet (S) are both opened at the upper end of the filter housing (1), the oil outlet (S) is correspondingly communicated with the inner cavity (14), the oil suction port (T) is opened at the bottom wall of the lower end of the filter housing (1), the filter device further comprises an oil return check valve (4), one end of the oil return check valve (4) is communicated with the oil suction port (T), and the other end of the oil return check valve is connected with an oil tank.

4. A filter device with a heater according to claim 3, further comprising an oil suction one-way valve (5) arranged in parallel with the oil return one-way valve (4), one end of the oil suction one-way valve (5) being in communication with the oil suction port (T) and the other end being adapted to be connected to an oil tank.

5. The filtering device with the heater according to claim 3, wherein the filtering housing (1) comprises a filtering head (11) and a filtering cylinder (12) connected with the filtering head (11), one end of the annular filter element (2) is connected with the filtering head (11), the other end of the annular filter element (2) extends into the filtering cylinder (12) and is connected with the bottom wall of the filtering cylinder (12), the bottom wall of the filtering cylinder (12) is provided with the oil suction port (T) corresponding to the inner side region of the annular filter element (2), the filtering head (11) is provided with the oil return port (R) and the oil outlet (S) corresponding to the outer side region of the annular filter element (2), the annular filter element (2) seals the filtering cylinder (12) at the position corresponding to the oil outlet (S), and the position where the filtering head (11) is connected with the annular filter element (2) is further formed with a communication with the inner side region A cavity (14) and a first oil passing hole (114) of the oil outlet (S), and the heater (3) is arranged on the filter head (11) and extends into the inner cavity (14).

6. The filtering device with the heater according to claim 5, wherein the annular filter element (2) comprises an upper end cover (21), a lower end cover (23) and a core body (22), the upper end cover (21) is connected with the filter head (11), the upper end cover (21) closes the filter cylinder (12) at a position corresponding to the oil outlet (S), the core body (22) is installed between the upper end cover (21) and the lower end cover (23) and located in the filter cylinder (12), the lower end cover (23) is connected with the bottom wall of the filter cylinder (12), and the heater (3) is installed on the filter head (11) and extends from the upper end cover (21) into the core body (22).

7. The filtering device with the heater according to claim 5, wherein the filter head (11) comprises a top plate (111), an outer peripheral side plate (112) surrounding the top plate (111), and an inner peripheral side plate (113) disposed on the top plate (111) and located inside the outer peripheral side plate (112), the upper end of the filter cylinder (12) is circumferentially connected with the outer peripheral side plate (112), the oil return opening (R) and the oil outlet (S) are respectively opened at two opposite sides of the outer peripheral side plate (112), the inner peripheral side plate (113) is circumferentially connected with the annular filter element (2), and the first oil passing hole (114) is opened at one side of the inner peripheral side plate (113) opposite to the oil outlet (S).

8. The heated filtering apparatus according to any one of claims 1 to 7, further comprising a temperature sensor (6) extending into the filtering chamber.

9. A hydraulic system, characterized in that it comprises a filter device with heater according to any one of claims 1 to 8.

10. A work machine, characterized in that it comprises a hydraulic system according to claim 9.

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