CN220676959U - Filter device and thermostat - Google Patents

Abstract

The utility model discloses a filtering device and a thermostat, wherein the filtering device comprises a liquid inlet pipe and a filter element, the liquid inlet pipe is provided with a first inserting structure and a boss, and the boss is provided with an elastic piece; the filter element is provided with a second plug-in structure matched with the first plug-in structure, the second plug-in structure is connected with the first plug-in structure, and the filter element is plugged in the liquid inlet pipe and compresses the elastic piece, so that the filter element is limited by the first plug-in structure along the displacement in the liquid flow direction. The filter device can prevent the filter element from falling off and is convenient for the disassembly and assembly of the filter element.

Description

Filter device and thermostat

Technical Field

The utility model relates to the technical field of engine coolant filters, in particular to a filtering device and a thermostat.

Background

In automotive cooling systems, thermostats play a very important role, the operating conditions of which determine the temperature of the engine coolant. The thermostat can timely adjust the water quantity entering the radiator, change the circulation range of water, adjust the heat radiation capacity of the cooling system, and ensure that the engine works in a proper temperature range.

In the related art, in order to prevent the filter element from falling off, an end cap is often provided. When the filter element is installed, the filter element is required to be installed firstly, then the end cover is installed to fix the filter element, and finally the end cover is fixed on the pipe wall. When the filter element is dismounted, the end cover is required to be firstly dismounted to be fixed on the pipe wall, then the end cover is dismounted, and finally the filter element is dismounted. The filter element is complex to assemble and disassemble, inconvenience is brought to replacement of the filter element, and meanwhile, the whole structure is complex and the assembly difficulty is high.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the filter device which can prevent the filter element from falling off and is convenient for the disassembly and assembly of the filter element.

The utility model also provides a thermostat with the filtering device

An embodiment of a filter device according to the first aspect of the present utility model includes:

the liquid inlet pipe is provided with a first inserting structure and a boss, and the boss is provided with an elastic piece;

the filter element is provided with a second plug-in mounting structure matched with the first plug-in mounting structure, the second plug-in mounting structure is connected with the first plug-in mounting structure, and the filter element is plugged in the liquid inlet pipe and compresses the elastic piece, so that the filter element is limited by the first plug-in mounting structure along the displacement in the liquid flow direction.

The filtering device provided by the embodiment of the utility model has at least the following beneficial effects:

in the installation of the filter core of this application embodiment, the operator inserts the filter core into the feed liquor pipe and rotatory to make first cartridge structure and second cartridge structure cooperation drop in order to avoid the filter core from the feed liquor pipe, the setting of elastic component has kept the connected state of first cartridge structure and second cartridge structure, in order to avoid the filter core not hard up drop in the use. The whole installation process is simple and quick, the assembly efficiency of the thermostat is improved, and the replacement of the filter element in the subsequent use process is facilitated. Compared with the prior art, the filter element is limited and locked through the independent locking component (such as the end cover), and the structure of fitting the plug-in assembly is integrated on the liquid inlet pipe and the filter element respectively without arranging an additional locking component, so that the number of parts of the filter device is reduced, and the structure is simplified.

According to some embodiments of the utility model, the elastic element is a sealing ring, the boss is provided with a mounting groove matched with the sealing ring, and the sealing ring is mounted in the mounting groove.

According to some embodiments of the utility model, the second plug-in structure is a limit protrusion, the limit protrusion is disposed on an outer wall of the filter element, the first plug-in structure includes a slot and a first limit groove, the slot and the first limit groove are disposed on an inner wall of the liquid inlet pipe, the first limit groove is disposed along a circumferential direction of the liquid inlet pipe, and the limit protrusion is plugged into the first limit groove through the slot.

According to some embodiments of the utility model, the first inserting structure is a limiting protrusion, the limiting protrusion is disposed on an inner wall of the liquid inlet pipe, the second inserting structure includes a slot and a first limiting groove, the slot and the first limiting groove are disposed on an outer wall of the filter element, the first limiting groove is disposed along a circumferential direction of the liquid inlet pipe, and the limiting protrusion is inserted into the first limiting groove through the slot.

According to some embodiments of the utility model, the first inserting structure is disposed on an end face of the liquid inlet pipe, the first inserting structure is a limiting protrusion, one end of the limiting protrusion is fixed on the end face of the liquid inlet pipe, the other end of the limiting protrusion extends towards a central shaft of the liquid inlet pipe, the second inserting structure comprises a slot and a first limiting groove, the slot and the first limiting groove are disposed on an outer wall of the filter element, the first limiting groove is disposed along a circumferential direction of the liquid inlet pipe, and the limiting protrusion is inserted into the first limiting groove through the slot.

According to some embodiments of the utility model, the limiting protrusion is provided with a plurality of limiting protrusions along the circumference of the liquid inlet pipe.

According to some embodiments of the utility model, the first limiting groove is annular.

According to some embodiments of the present utility model, a plurality of first limiting grooves and the slots are provided, the plurality of first limiting grooves are circumferentially spaced, the number of the first limiting grooves is the same as that of the slots, and the first limiting grooves and the slots are connected in one-to-one correspondence.

According to some embodiments of the utility model, a second limiting groove is arranged on the side surface of the first limiting groove connected with the slot, and the limiting protrusion is inserted into the second limiting groove, so that the filter element is limited by the first inserting structure to displace circumferentially.

A thermostat according to an embodiment of the second aspect of the utility model comprises a filter device as in any of the above embodiments.

The thermostat according to the embodiment of the utility model has at least the following beneficial effects:

the filter element can be fixed without an end cover, so that the filter element is easy to assemble and disassemble, the filter element is convenient to replace, and the filter element can be prevented from falling off in the liquid inlet pipe.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view showing the construction of a filter device according to an embodiment of the first aspect of the present utility model applied to a thermostat according to an embodiment of the second aspect;

FIG. 2 is a schematic cross-sectional view of a filter device of the present utility model;

FIG. 3 is a schematic cross-sectional view of a liquid inlet tube according to the present utility model;

fig. 4 is a schematic structural view of the filter cartridge of the present utility model.

Reference numerals:

the liquid inlet pipe 100, the boss 110, the mounting groove 111, the slot 120, the first limit groove 130, the elastic piece 200, the filter element 300, the limit protrusion 400 and the thermostat main body 500.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," 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 present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

An embodiment of a first aspect of the present application provides a filtering device, as shown in fig. 2 to fig. 4, where the filtering device includes a liquid inlet pipe 100 and a filter element 300, a first insertion structure and a boss 110 are sequentially disposed on the liquid inlet pipe 100 along a liquid flow direction, an inner wall of the liquid inlet pipe 100 extends inwards to form the boss 110, and the boss 110 may be disposed along a circumferential direction of the liquid inlet pipe 100; alternatively, a plurality of bosses 110 may be provided, and the plurality of bosses 110 are distributed along the circumferential direction of the inlet tube 100. The surface of the boss 110 facing the first inserting structure is provided with an elastic piece 200, the surface of the boss 110 facing the first inserting structure is provided with a mounting groove 111, the shape and the size of the mounting groove 111 are matched with those of the elastic piece 200, and the elastic piece 200 is mounted in the mounting groove 111.

The filter element 300 is provided with a second plug-in structure matched with the first plug-in structure, when the filter element 300 is installed, an operator holds the filter element 300 to insert the filter element into the liquid inlet pipe 100 from the opening of the liquid inlet end of the liquid inlet pipe 100, the second plug-in structure is connected with the first plug-in structure, and after the first plug-in structure moves to the set position of the second plug-in structure, the filter element 300 is rotated to limit the displacement of the first plug-in structure along the liquid flowing direction by the second plug-in structure. When the first insertion structure moves to the set position of the second insertion structure, the first insertion structure can abut against the elastic member 200 and compress the elastic member 200 to restore the elastic deformation. It will be appreciated that the elastic member 200 has a tendency to resume elastic deformation and applies a pushing force to the cartridge 300 in the opposite direction of the liquid flow direction so as to maintain the coupled state of the first and second cartridge structures, thereby preventing the cartridge 300 from falling out of the feed tube 100.

More specifically, when the cartridge 300 is installed in the feed tube 100, the cartridge 300 is restrained from displacement in the direction of fluid flow by the first insertion structure on the feed tube 100, so that the cartridge 300 cannot be directly removed from the feed tube 100 in the direction opposite to the direction of fluid flow. And, when first cartridge structure is connected with second cartridge structure, the elastic component 200 is in compression state to make the elastic component 200 exert to the thrust of filter core 300 along the reverse direction of liquid flow, thereby make second cartridge structure and first cartridge structure tightly support and hold, thereby there is great static friction between second cartridge structure and the first cartridge structure, with the relative displacement in the circumference of restriction filter core 300 and feed liquor pipe 100, thereby avoid causing the not hard up of filter core 300 because of liquid impact, mechanical vibration etc. cause, and then avoided first cartridge structure to drop from second cartridge structure, improved the stability of filter core 300 installation in feed liquor pipe 100.

When the filter cartridge 300 is detached, the operator presses the filter cartridge 300 again, and the pushing force applied by the elastic member 200 is offset by the pressure applied by the operator, so that the first and second insertion structures can be separated, and the filter cartridge 300 can be rotated relative to the liquid inlet pipe 100, so that the connection state of the first and second insertion structures is released, and the filter cartridge 300 can be moved in the opposite direction of the liquid flow until the filter cartridge 300 is separated from the liquid inlet pipe 100.

Based on the above, in the installation process of the filter element 300 of the embodiment of the application, an operator inserts the filter element 300 into the liquid inlet pipe 100 and rotates the filter element, so that the first plug-in structure and the second plug-in structure cooperate to avoid the filter element 300 from falling off from the liquid inlet pipe 100, and the setting of the elastic member 200 maintains the connection state of the first plug-in structure and the second plug-in structure, so as to avoid the filter element 300 from loosening and falling off in the use process. The whole installation process is simple and quick, the assembly efficiency of the thermostat is improved, and the replacement of the filter element 300 in the subsequent use process is facilitated. Compared with the prior art, the filter element 300 is required to be limited and locked by an independent locking component (such as an end cover), and the additional locking component is not required to be arranged in the embodiment of the application, so that the structure of the plug-in assembly is respectively integrated on the liquid inlet pipe 100 and the filter element 300, the number of parts of the filter device is reduced, and the structure is simplified.

It is understood that the elastic member 200 may be a spring, an abutment block made of elastic material, etc., disposed on the boss 110, for abutting against the filter cartridge 300 and applying an elastic force to the filter cartridge 300. In some embodiments, the elastic member 200 may be a sealing ring, and the boss 110 is provided with a mounting groove 111 matched with the sealing ring, and the sealing ring is mounted in the mounting groove 111. Wherein, the sealing ring is higher than the depth of the mounting groove 111, the sealing ring is inserted into the bottom surface of the mounting groove 111, and the top of the sealing ring extends out of the mounting groove 111, so that the filter element 300 is abutted and compressed after the filter element 300 is inserted into the liquid inlet pipe 100.

As shown in fig. 2, the side surface of the boss 110 abuts against the end surface of the filter element 300, and the seal ring is located between the boss 110 and the filter element 300 and abuts against the boss 110 and the filter element 300, respectively. The gasket separates the gap between the outer periphery of the cartridge 300 and the inner wall of the feed tube 100 from the passage of the liquid flow within the feed tube, thereby preventing the liquid from seeping out through the gap between the cartridge 300 and the feed tube 100. The arrangement of the sealing ring not only plays a role in abutting connection with the filter element 300 and applying elastic force to the filter element 300, but also improves the sealing performance of the connection between the filter element 300 and the liquid inlet pipe 100, and avoids liquid from seeping out from a gap between the periphery of the filter element 300 and the inner wall of the liquid inlet pipe 100.

In some embodiments, the second plug-in structure is a limit projection 400, the limit projection 400 being disposed on an outer wall of the cartridge 300. The first inserting structure and the boss 110 are sequentially arranged on the inner wall of the liquid inlet pipe 100 along the liquid flowing direction, the first inserting structure comprises a slot 120 and a first limiting groove 130 which are matched with the limiting protrusion 400, the slot 120 and the first limiting groove 130 are sequentially arranged on the inner wall of the liquid inlet pipe 100 along the liquid flowing direction, the first limiting groove 130 is circumferentially arranged along the liquid inlet pipe 100, an opening at one end of the slot 120 is formed in the wall of the first limiting groove 130, and the other end of the slot 120 extends to a direction far away from the first limiting groove 130 until penetrating through the end face of the liquid inlet end of the liquid inlet pipe 100, so that the limiting protrusion 400 can be inserted into the first limiting groove 130 through the slot 120.

When the filter element 300 is installed, the limiting protrusion 400 on the filter element 300 is aligned with the opening of the slot 120 on the end face of the liquid inlet end of the liquid inlet pipe 100, and the filter element 300 is pushed to be inserted into the liquid inlet pipe 100 along with the extending direction of the slot 120, and the slot 120 can play a guiding role on the movement of the filter element 300. Until the cartridge 300 moves into abutment with the resilient member 200, the cartridge 300 is further pushed so that the cartridge 300 continues to move in the direction of the flow of the liquid to compress the resilient member 200 until the stop protrusion 400 is located at the intersection of the first stop groove 130 and the slot 120, and then the cartridge 300 is rotated so that the stop protrusion 400 moves circumferentially into the first stop groove 130. At this time, the operator can release the pushing force applied to the filter cartridge 300, so that the filter cartridge 300 is abutted against the groove wall of the first limiting groove 130 and is limited in displacement in the liquid flow direction by the groove wall of the first limiting groove 130 by the elastic force applied to the filter cartridge 300 by the elastic member 200.

When the filter cartridge 300 is disassembled, the operator presses the filter cartridge 300 to move the filter cartridge 300 in the liquid flow direction and further compress the elastic member 200, thereby separating the limit protrusion 400 from the groove wall of the first limit groove 130, maintaining the state in which the limit protrusion 400 is separated from the groove wall of the first limit groove 130, and rotating the filter cartridge 300 until the limit protrusion 400 is aligned with the opening of the slot 120 on the groove wall of the first limit groove 130, and then removing the filter cartridge 300 from the liquid inlet pipe 100.

It can be appreciated that, after the limiting protrusion 400 is aligned with the opening of the slot 120 on the slot wall of the first limiting slot 130, the elastic member 200 can push the filter element 300 to move in the opposite direction of the liquid flowing direction until the elastic force disappears, so as to assist the operator in removing the filter element 300 from the liquid inlet tube 100. The filter element 300 in this embodiment has few disassembly and assembly steps, and the disassembly and assembly operations of the first plug-in mounting structure and the second plug-in mounting structure are simple, so that the quick disassembly and assembly of the filter element 300 are ensured.

Meanwhile, on the one hand, when the filter element 300 is installed in the liquid inlet pipe 100, the first limiting groove 130 limits the displacement of the limiting protrusion 400 along the liquid flow direction, so that the filter element 300 is prevented from falling off from the liquid inlet pipe 100. On the other hand, when the limiting protrusion 400 is abutted on the groove wall of the connecting slot 120 on the first limiting groove 130, the elastic member 200 applies elastic force to the filter element 300, so that the limiting protrusion 400 is tightly abutted on the groove wall of the first limiting groove 130, so that larger static friction force exists between the groove wall of the first limiting groove 130 and the limiting protrusion 400, further displacement of the filter element 300 along the circumferential direction of the liquid inlet pipe 100 is limited, loosening of the filter element 300 caused by liquid impact to the filter element 300 is avoided, and therefore the situation that the filter element 300 falls off from the liquid inlet pipe 100 due to the fact that the limiting protrusion 400 moves to an opening position of the slot 120 on the groove wall of the first limiting groove 130 is avoided.

In other embodiments, unlike the above embodiments, the first inserting structure is a limiting protrusion 400, the limiting protrusion 400 is disposed on the inner wall of the liquid inlet tube 100, and the first inserting structure and the boss 110 are sequentially disposed on the inner wall of the liquid inlet tube 100 along the liquid flowing direction. The second plug-in mounting structure includes slot 120 and first spacing groove 130 with spacing protruding 400 assorted, and slot 120 and first spacing groove 130 set gradually on the outer wall of filter core 300 along the opposite direction of liquid flow direction, and first spacing groove 130 sets up along the circumference of filter core 300, and the opening of slot 120 one end sets up on the cell wall of first spacing groove 130, and the other end of slot 120 extends until running through the terminal surface of filter core 300 to the direction of keeping away from first spacing groove 130 to make spacing protruding 400 can pass through slot 120 cartridge to in the first spacing groove 130.

The disassembly and assembly operations in this embodiment are also simple, and the limiting projection 400 limits the displacement of the filter element 300 in the liquid flow direction, preventing the filter element 300 from falling out of the liquid inlet pipe 100. Meanwhile, the limiting protrusion 400 limits the displacement of the filter element 300 along the circumferential direction, and the loosening of the filter element 300 caused by the impact of liquid on the filter element 300 is avoided, so that the limiting protrusion 400 is prevented from moving to the opening position of the slot 120 on the slot wall of the first limiting slot 130, and the filter element 300 is further prevented from falling off from the liquid inlet pipe 100.

In addition, in other embodiments, the first inserting structure may be disposed on an end surface of the liquid inlet tube 100, where the first inserting structure is a limiting protrusion 400, one end of the limiting protrusion 400 is fixed on the end surface of the liquid inlet tube 100, the other end extends toward a central axis of the liquid inlet tube 100, and along a projection of a liquid flowing direction, a free end of the limiting protrusion 400 extends into an inner wall of the liquid inlet tube 100. The second inserting structure comprises a slot 120 and a first limiting groove 130 which are matched with the limiting protrusion 400, the slot 120 and the first limiting groove 130 are sequentially arranged on the outer wall of the filter element 300 along the reverse direction of the liquid flowing direction, the first limiting groove 130 is arranged along the circumferential direction of the liquid inlet pipe 100, an opening at one end of the slot 120 is arranged on the wall of the first limiting groove 130, and the other end of the slot 120 extends to the direction far away from the first limiting groove 130 until penetrating through the end face of the liquid inlet pipe 100, so that the limiting protrusion 400 is inserted into the first limiting groove 130 through the slot 120. In this embodiment, the limiting protrusion 400 is disposed on the end surface of the liquid inlet pipe 100, so that the liquid inlet pipe 100 does not need to be grooved or protruded in the liquid inlet pipe 100, and the processing difficulty of the liquid inlet pipe 100 is low.

Based on the connection manner between the three first plug-in structures and the second plug-in structure, the slots 120 may be arranged along the flowing direction of the liquid; or the slots 120 may be laid out along a spiral line.

In some embodiments, the limiting protrusions 400 are uniformly provided in plurality along the circumferential direction of the liquid inlet pipe 100 to ensure the strength of the limiting protrusions 400.

Based on the foregoing, the first limiting groove 130 is annular, the annular groove is convenient to process, and when the limiting protrusion 400 is inserted into the first limiting groove 130, the limiting protrusion 400 can slide in the first limiting groove 130 due to the structure of the annular groove when rotating in both clockwise and counterclockwise directions.

In addition, the first limiting grooves 130 and the slots 120 are provided in plurality, the plurality of first limiting grooves 130 are arranged at intervals along the circumferential direction, the number of the first limiting grooves 130 is the same as that of the slots 120, and the first limiting grooves 130 are connected with the slots 120 in a one-to-one correspondence manner. It will be appreciated that after the stop tab 400 is rotated clockwise (or counterclockwise) from the slot 120 into the first stop slot 130, it can continue to rotate in the same direction clockwise (or counterclockwise) until it abuts against the end wall of the end of the first stop slot 130 remote from the slot 120 to alert the operator that it has rotated into place by crash feedback.

Since the first limiting grooves 130 are not communicated with each other, the situation that the limiting protrusion 400 is withdrawn from one slot 120 due to an excessive rotation angle after being inserted from the other slot 120 does not occur in the installation process of the present embodiment. The slot 120 and the first limiting slot 130 are communicated with the end part of the first limiting slot 130; or, the slot 120 and the first limiting groove 130 are communicated with the middle part of the first limiting groove 130, so that the filter element 300 can rotate in both clockwise and anticlockwise directions to enable the limiting protrusion 400 to slide in the first limiting groove 130;

in some embodiments, the side of the first limiting groove 130 connected to the slot 120 is provided with a second limiting groove, the second limiting groove extends along the flowing direction of the liquid, and the limiting protrusion 400 can be inserted into the second limiting groove through the slot 120 and the first limiting groove 130 in sequence, so that the filter element 300 is limited by the first inserting structure to displace circumferentially.

Taking the example that the filter element 300 is provided with the spacing protrusion 400, the liquid inlet pipe 100 is provided with the slot 120, the first spacing groove 130 and the second spacing groove, the second spacing groove can be arranged at one end of the first spacing groove 130 away from the slot 120, so that when the filter element 300 rotates, the spacing protrusion 400 continuously rotates along the same direction until being abutted with the end wall of the first spacing groove 130 after entering the first spacing groove 130 from the slot 120, at the moment, an operator feels the collision, thereby knowing that the filter element 300 rotates in place, and then the filter element 300 is loosened. The cartridge 300 moves in the reverse direction of the flow direction of the liquid by the elastic member 200 so that the stopper protrusion 400 enters the second stopper groove. When the limit protrusion 400 is located in the second limit groove, its circumferential displacement is limited by the groove walls at both sides of the second limit groove.

In a second aspect of the present disclosure, a thermostat is provided, as shown in fig. 1, including a thermostat main body 500 and a filtering device according to any one of the foregoing embodiments, where the thermostat main body 500 may be integrally formed with a liquid inlet pipe 100, and a liquid such as a cooling liquid enters the thermostat main body 500 through the liquid inlet pipe 100; alternatively, the liquid inlet pipe 100 and the thermostat main body 500 are two independent components, and the thermostat main body 500 is provided with a liquid inlet, and the liquid outlet end of the liquid inlet pipe 100 is connected with the thermostat main body 500, so that the inner cavity of the liquid inlet pipe 100 is communicated with the liquid inlet. The connection of the inlet pipe 100 to the thermostat body 500 may be a threaded connection, a flanged connection, a welded connection, or other connection.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A filter device, comprising:

the liquid inlet pipe is provided with a first inserting structure and a boss, and the boss is provided with an elastic piece;

the filter element is provided with a second plug-in mounting structure matched with the first plug-in mounting structure, the second plug-in mounting structure is connected with the first plug-in mounting structure, and the filter element is plugged in the liquid inlet pipe and compresses the elastic piece, so that the filter element is limited by the first plug-in mounting structure along the displacement in the liquid flow direction.

2. The filter device according to claim 1, wherein the elastic member is a sealing ring, the boss is provided with a mounting groove matched with the sealing ring, and the sealing ring is mounted in the mounting groove.

3. The filter device of claim 1, wherein the second plug-in structure is a limit protrusion, the limit protrusion is disposed on an outer wall of the filter element, the first plug-in structure includes a slot and a first limit groove, the slot and the first limit groove are disposed on an inner wall of the liquid inlet pipe, the first limit groove is disposed along a circumferential direction of the liquid inlet pipe, and the limit protrusion is plugged into the first limit groove through the slot.

4. The filter device of claim 1, wherein the first plug-in structure is a limit protrusion, the limit protrusion is disposed on an inner wall of the liquid inlet pipe, the second plug-in structure includes a slot and a first limit groove, the slot and the first limit groove are disposed on an outer wall of the filter element, the first limit groove is disposed along a circumferential direction of the liquid inlet pipe, and the limit protrusion is plugged into the first limit groove through the slot.

5. The filter device according to claim 1, wherein the first insertion structure is disposed on an end face of the liquid inlet pipe, the first insertion structure is a limiting protrusion, one end of the limiting protrusion is fixed on the end face of the liquid inlet pipe, the other end extends toward a central axis of the liquid inlet pipe, the second insertion structure comprises a slot and a first limiting groove, the slot and the first limiting groove are disposed on an outer wall of the filter element, the first limiting groove is disposed along a circumferential direction of the liquid inlet pipe, and the limiting protrusion is inserted into the first limiting groove through the slot.

6. The filter device according to any one of claims 3 to 5, wherein the limiting projection is provided in plurality along the circumferential direction of the liquid inlet pipe.

7. The filter device of any one of claims 3 to 5, wherein the first limiting groove is annular.

8. The filter device according to any one of claims 3 to 5, wherein a plurality of the first limiting grooves and the slots are provided, the plurality of the first limiting grooves are provided at intervals in the circumferential direction, the number of the first limiting grooves and the number of the slots are the same, and the first limiting grooves and the slots are connected in one-to-one correspondence.

9. The filter device according to any one of claims 3 to 5, wherein a second limit groove is provided on a side surface of the first limit groove connected to the slot, and the limit protrusion can be inserted into the second limit groove sequentially through the slot and the first limit groove, so that the filter element is limited by the first insertion structure to displace circumferentially.

10. Thermostat, characterized by comprising a filter device according to any one of claims 1 to 9.