Thick film heater for heating liquid

Abstract

The utility model relates to a thick film heater for heating liquid, which comprises a shell and a flow guide part, and a flow guide cavity for accommodating liquid and guiding the liquid to flow is formed after the shell and the flow guide part are assembled; a sealing sleeve assembly is arranged at the matching position between the shell and the flow guide part in the liquid inlet end direction and the liquid outlet end direction of the flow guide cavity, and the sealing sleeve assembly is arranged on the flow guide part in a sleeving mode. The shell and the flow guide part are both in close contact with the sealing sleeve assembly after being assembled, the sealing sleeve assembly is clamped between the shell and the flow guide part, the shell and the flow guide part are assembled in a sealed mode through the sealing sleeve assembly, and the flow guide cavity forms a relatively-closed cavity. The phenomenon that the sealing sleeve assembly rolls over is effectively prevented, the sealing effect is improved, other additional means are not needed for sealing between the shell and the flow guide part, screw-free fixed part assembly is achieved, and the assembly efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid heating, in particular to a thick film heater for heating liquid. Background Art

[0002] On the one hand, Chinese Patent No. ZL201920641683.7 discloses a thick film liquid heater, comprising a heat-conducting cylinder, a thick film heating component arranged on the outer side of the heat-conducting cylinder, and a water inlet nozzle and a water outlet nozzle arranged at both ends of the heat-conducting cylinder. A heating channel connecting the water inlet nozzle and the water outlet nozzle is formed in the heat-conducting cylinder. The water inlet nozzle and the water outlet nozzle are respectively plugged into the two ends of the heat-conducting cylinder. Soft sealing covers are respectively provided at both ends of the heat-conducting cylinder. The sealing cover has a bottom surface and an outer rim with an annular protrusion around the bottom surface. A sealing hole for the water inlet nozzle and the water outlet nozzle to pass through is provided on the bottom surface. The sealing hole is sealed with the water inlet nozzle and the water outlet nozzle by an interference fit. The outer rim is coated on the outer side of the heat-conducting cylinder near its end, and the outer rim is sealed with the outer side by an interference fit. Both ends of the heat-conducting cylinder of this structure are respectively blocked by sealing covers, and the sealing covers are only interference-fitted on the ends of the heat-conducting cylinder. When the thick-film liquid heater is heated for a long time, the heat-conducting cylinder expands due to the heat, so that the sealing cover is deformed. When the heat-conducting cylinder cools down, the heat-conducting cylinder contracts, and the sealing cover is expanded and deformed accordingly. In this way, when the thick-film liquid heater is used for a long time, the sealing cover is deformed, resulting in failure of the sealing structure, and the sealing cover will roll over after being expanded.

[0003] On the other hand, Chinese patent number ZL202222640187.4 discloses an instant hot water faucet, including a heating cylinder with water inlet joints and water outlet joints at both ends, and a heat insulation component is provided on the outside of the heating cylinder, and the heat insulation component includes a front heat insulation sleeve and a rear heat insulation sleeve, which are mutually buckled through a buckling mechanism and the heating cylinder is buckled therein. The water inlet joint, the water outlet joint and the heating cylinder are separately arranged, so that the spiral body can be installed in the heating cylinder, and the assembly between the water inlet joint, the water outlet joint and the heating cylinder is provided with a seal, which leads to a complex installation structure and too many installation parts.

[0004] Therefore, further improvement is needed. Utility Model Content

[0005] The utility model aims to provide a thick film heater for heating liquids, wherein the components in the sealing sleeve assembly are sleeved on the guide piece, and the shell and the guide piece are in close contact with the sealing sleeve assembly after assembly, and the shell and the guide piece clamp the sealing sleeve assembly to each other, thereby effectively preventing the sealing sleeve assembly from rolling over and improving the sealing effect, and no other additional means are required to seal between the shell and the guide piece, thereby realizing screw-free fixing assembly and high assembly efficiency.

[0006] The purpose of the utility model is achieved in this way:

[0007] A thick film heater for heating liquid includes a shell and a flow guide. After the shell and the flow guide are assembled, a flow guide cavity for containing liquid and guiding the flow of liquid is formed. A sealing sleeve assembly is provided at the joint between the shell and the flow guide along the liquid inlet and outlet directions of the flow guide cavity. The sealing sleeve assembly is sleeved on the flow guide. After the shell and the flow guide are assembled, they are in close contact with the sealing sleeve assembly, and the shell and the flow guide clamp the sealing sleeve assembly to each other. The sealing assembly is formed between the shell and the flow guide through the sealing sleeve assembly, and the flow guide cavity is formed into a relatively closed cavity. The sealing sleeve assembly is effectively prevented from rolling over, and the sealing effect is improved. No other additional means are required to seal between the shell and the flow guide, and screw-free fixing assembly is achieved, with high assembly efficiency.

[0008] The sealing sleeve assembly comprises a first sealing sleeve and a sealing end cover which are arranged in the direction of the liquid inlet end of the guide piece, and a second sealing sleeve which is arranged in the direction of the liquid outlet end of the guide piece. The first sealing sleeve and the second sealing sleeve are respectively sleeved on the guide piece, the sealing end cover and the guide piece are tightly assembled, and the first sealing sleeve is clamped between the shell body and the guide piece respectively and the sealing end cover to form a sealing portion in the direction of the liquid inlet end of the guide chamber; the second sealing sleeve is clamped between the shell body and the peripheral side of the guide piece under the action of the sealing end cover tightly buckling the guide piece to form a sealing portion in the direction of the liquid outlet end of the guide chamber, the first sealing sleeve and the second sealing sleeve are respectively installed at the end position matching positions between the shell body and the guide piece, and the sealing sleeve at one end is pressed by the cover body, so that when the sealing sleeve assembly, the shell body and the guide piece are assembled with each other, the first sealing sleeve and the second sealing sleeve of the sealing sleeve assembly can be clamped to prevent the sealing sleeve from moving, thereby improving the sealing effect.

[0009] The guide piece is provided with a step portion corresponding to the liquid inlet end direction of the guide cavity, and the guide piece is provided with a first sealing sleeve and a sealing end cover constituting a sealing sleeve assembly, and the first sealing sleeve includes a first sealing portion, a second sealing portion, and a third sealing portion; when the shell, the guide piece, the first sealing sleeve and the sealing end cover are assembled, the first sealing sleeve is arranged on the outer side of the guide piece, and the first sealing portion abuts on the step portion, and the second sealing portion abuts on the wall surface of the inner cavity of the shell, so as to effectively realize the sealing at the matching point between the inner peripheral side of the shell and the outer peripheral side of the guide piece, one end of the third sealing portion abuts on an outer end surface of the shell, and the sealing end cover is buckled on the guide piece and presses the other end of the third sealing portion, so that the shell, the guide piece and the sealing end cover respectively clamp the first sealing sleeve mutually, so as to prevent the first sealing sleeve from moving up and down and back and forth.

[0010] The second sealing portion is provided with one or more first sealing ribs abutting against the inner wall of the shell; the sealing end cover includes a cover body abutting against the third sealing portion, the outer diameter of the third sealing portion is larger than the outer diameter of the shell and / or the cover body, and the third sealing portion of the first sealing sleeve completely covers an outer end of the shell to achieve end face sealing between the shell and one end of the guide member to prevent liquid from leaking through the end face matching between the shell and the guide member.

[0011] The first sealing sleeve is provided with an assembly cavity, the sealing end cover includes an assembly portion inserted into the assembly cavity, and the assembly cavity is provided with a matching rib abutting against the assembly portion, so as to effectively realize the tight assembly between the sealing end cover and the first sealing sleeve without the need for additional screws or other fasteners for auxiliary fixation.

[0012] The first sealing sleeve is provided with a first groove portion which is sleeved on the guide piece, and the sealing end cover is provided with a second groove portion which is sleeved on the guide piece; the guide piece is provided with a buckling groove, and the sealing end cover is provided with a buckling rib; when the guide piece and the sealing end cover are tightly buckled, the buckling rib is limitedly buckled on the buckling groove to prevent the sealing end cover from being separated from the guide piece, and at the same time, the sealing end cover is tightly buckled on the guide piece to effectively compress the first sealing sleeve and the second sealing sleeve.

[0013] The guide piece is provided with a positioning groove portion and a positioning ring portion corresponding to the liquid outlet end direction of the guide cavity, and the guide piece is provided with a second sealing sleeve constituting one of the sealing sleeve assemblies, and the second sealing sleeve includes a first sealing body and a second sealing body; when the shell, the guide piece and the second sealing sleeve are assembled, the second sealing sleeve is arranged on the outer side of the guide piece, and one end of the first sealing body abuts on the outer side of the guide piece, and the other end of the first sealing body abuts on the wall surface of the inner cavity of the shell, effectively realizing the sealing at the matching point between the inner peripheral side of the shell and the outer peripheral side of the guide piece, one end of the second sealing body abuts on the positioning ring portion, and the other end of the second sealing body abuts on the other outer end surface of the shell, so that the second sealing sleeve is clamped between the shell and the guide piece to prevent the second sealing sleeve from moving up and down and back and forth.

[0014] The second sealing sleeve is provided with a third groove portion which is sleeved on the outer side of the flow guide piece; the first sealing body is provided with one or more second sealing ribs which abut against the inner wall surface of the shell; the outer diameter of the second sealing body is larger than the outer diameter of the positioning ring portion and / or the shell, and the second sealing body of the second sealing sleeve completely covers the other outer end of the shell to achieve end face sealing between the other ends of the shell and the flow guide piece, thereby preventing liquid from leaking through the end face fitting between the shell and the flow guide piece.

[0015] A temperature sensor for detecting the temperature of the liquid outlet end of the guide member or the guide cavity is provided on the positioning ring. The temperature sensor includes a temperature probe that is directly in contact with the liquid. The temperature probe of the temperature sensor is in direct contact with the water, eliminating the contact between the temperature sensor and the shell. It is also necessary to use a fuzzy algorithm for temperature compensation to increase the accuracy of liquid temperature measurement.

[0016] A heating film is provided on the outer surface of the shell, and the heating film covers the outer surface of the shell. A plurality of spiral blades arranged at intervals are provided on the flow guide. When the shell and the flow guide are assembled, a flow guide cavity with a spiral flow channel is formed between the spiral blades and the inner wall of the shell cavity. A water inlet joint and a water outlet joint connected to the flow guide cavity are provided on the flow guide. A bracket for installing a thermostat is provided on the shell, and a plurality of plug-in terminals arranged at intervals are provided on the bracket. The temperature sensor, the thermostat and the heating film are electrically connected to the corresponding terminals through wires respectively. The water inlet joint and the water outlet joint are integrally formed at both ends of the body of the flow guide.

[0017] When the outer surface temperature of the shell is too high, the thermostat is disconnected and the surface heating film continues to generate heat, effectively protecting the thick film heater and avoiding dry burning.

[0018] The beneficial effects of the utility model are as follows:

[0019] By sleeveing ​​the components of the sealing sleeve assembly on the guide piece, the shell and the guide piece are in close contact with the sealing sleeve assembly after assembly, and the shell and the guide piece clamp the sealing sleeve assembly to each other, which effectively prevents the sealing sleeve assembly from rolling over and improves the sealing effect. In addition, no other additional means are required to seal between the shell and the guide piece, thereby achieving screw-free fixing assembly and high assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a thick film heater according to an embodiment of the utility model.

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the thick film heater in another orientation according to an embodiment of the utility model.

[0022] Figure 3 This is a schematic diagram of the assembly and decomposition structure of a thick film heater according to an embodiment of the utility model.

[0023] Figure 4 It is a schematic diagram of the assembly and decomposition structure of the housing and the bracket according to one embodiment of the utility model.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of a flow guide member according to an embodiment of the utility model.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the flow guide member in another aspect of an embodiment of the utility model.

[0026] Figure 7 It is a schematic diagram of the three-dimensional cross-sectional structure of a thick film heater according to an embodiment of the utility model.

[0027] Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0028] Fig. 9 for Figure 7 Enlarged view of point B in the middle.

[0029] Fig.10 It is a schematic diagram of the three-dimensional structure of the second sealing sleeve in one embodiment of the utility model.

[0030] Fig.11 It is a schematic diagram of the three-dimensional structure of the first sealing sleeve in one embodiment of the utility model.

[0031] Fig.12 The figure is a three-dimensional structural schematic diagram of a sealing end cover according to an embodiment of the utility model. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0033] See also Figure 1-Figure 12 A thick film heater for heating liquid comprises a shell 1 and a flow guide 2. The shell 1 and the flow guide 2 are assembled to form a flow guide cavity for containing liquid and guiding the flow of liquid. A sealing sleeve assembly 3 is provided at the fitting part between the shell 1 and the flow guide 2 along the liquid inlet and outlet directions of the flow guide cavity. The sealing sleeve assembly 3 is sleeved on the flow guide 2. The shell 1 and the flow guide 2 are in close contact with the sealing sleeve assembly 3 after being assembled, and the sealing sleeve assembly 3 is clamped between the shell 1 and the flow guide 2. The shell 1 and the flow guide 2 form a sealed assembly through the sealing sleeve assembly 3, and the flow guide cavity forms a relatively closed cavity.

[0034] The sealing sleeve assembly 3 includes a first sealing sleeve 4 and a sealing end cover 5 arranged in the direction of the liquid inlet end of the guide member 2, and a second sealing sleeve 6 arranged in the direction of the liquid outlet end of the guide member 2. The first sealing sleeve 4 and the second sealing sleeve 6 are respectively sleeved on the guide member 2, the sealing end cover 5 is tightly assembled with the guide member 2, and the shell 1 and the guide member 2 are respectively clamped with the sealing end cover 5 to form a sealing portion in the direction of the liquid inlet end of the guide cavity; the shell 1 and the peripheral sides of the guide member 2 are clamped with the second sealing sleeve 6 under the action of the sealing end cover 5 tightly fastening the guide member 2 to form a sealing portion in the direction of the liquid outlet end of the guide cavity.

[0035] The guide member 2 is provided with a step portion 7 corresponding to the liquid inlet end direction of the guide cavity, and the guide member 2 is provided with a first sealing sleeve 4 and a sealing end cover 5 constituting a sealing sleeve assembly 3, and the first sealing sleeve 4 includes a first sealing portion 9, a second sealing portion 10, and a third sealing portion 11; when the shell 1, the guide member 2, the first sealing sleeve 4, and the sealing end cover 5 are assembled, the first sealing sleeve 4 is sleeved on the outer side of the guide member 2, and the first sealing portion 9 abuts on the step portion 7, the second sealing portion 10 abuts on the inner cavity wall of the shell 1, and one end of the third sealing portion 11 abuts on an outer end surface of the shell 1, and the sealing end cover 5 is buckled on the guide member 2 and presses the other end of the third sealing portion 11, so that the first sealing sleeve 4 is clamped between the shell 1 and the guide member 2 and the sealing end cover 5 respectively.

[0036] The second sealing portion 10 is provided with one or more first sealing ribs 12 abutting against the inner cavity wall of the shell 1; the sealing end cover 5 includes a cover body 20 abutting against the third sealing portion 11, the outer diameter of the third sealing portion 11 is larger than the outer diameter of the shell 1 and / or the cover body 20, and the third sealing portion 11 of the first sealing sleeve 4 completely covers one outer end of the shell 1 to achieve end face sealing between the shell 1 and one end of the guide member 2.

[0037] In this embodiment, three first sealing ribs 12 arranged at intervals and in an annular structure are provided on the second sealing portion 10. The first sealing ribs 12 can effectively make up for the installation gap between the first sealing sleeve 4 and the inner cavity of the shell 1 on the one hand, thereby achieving gap compensation and improving the sealing effect. On the other hand, multiple first sealing ribs 12 arranged at intervals abut against the inner cavity of the shell 1 to form multiple seals.

[0038] The first sealing sleeve 4 is provided with an assembly cavity 13 , and the sealing end cover 5 includes an assembly portion 14 inserted into the assembly cavity 13 . The assembly cavity 13 is provided with a matching rib 15 abutting against the assembly portion 14 .

[0039] The first sealing sleeve 4 is provided with a first groove portion 17 which is sleeved on the guide member 2, and the sealing end cover 5 is provided with a second groove portion 18 which is sleeved on the guide member 2; the guide member 2 is provided with a buckling groove 16, and the sealing end cover 5 is provided with a buckling rib 19; when the guide member 2 and the sealing end cover 5 are tightly buckled, the buckling rib 19 is limitedly buckled on the buckling groove 16.

[0040] The guide member 2 is provided with a positioning groove portion 21 and a positioning ring portion 24 corresponding to the liquid outlet end direction of the guide cavity. The guide member 2 is provided with a second sealing sleeve 6 constituting one of the sealing sleeve assemblies 3. The second sealing sleeve 6 includes a first sealing body 22 and a second sealing body 23. When the shell 1, the guide member 2 and the second sealing sleeve 6 are assembled, the second sealing sleeve 6 is sleeved on the outer side of the guide member 2, and one end of the first sealing body 22 abuts on the outer side of the guide member 2, and the other end of the first sealing body 22 abuts on the inner cavity wall of the shell 1, one end of the second sealing body 23 abuts on the positioning ring portion 24, and the other end of the second sealing body 23 abuts on the other outer end surface of the shell 1, so that the second sealing sleeve 6 is clamped between the shell 1 and the guide member 2.

[0041] The second sealing sleeve 6 is provided with a third groove portion 25 which is sleeved on the outer side of the guide member 2; the first sealing body 22 is provided with one or more second sealing ribs 26 which abut against the inner wall surface of the shell 1; the outer diameter of the second sealing body 23 is larger than the outer diameter of the positioning ring portion 24 and / or the shell 1, and the second sealing body 23 of the second sealing sleeve 6 completely covers the other outer end of the shell 1 to achieve end face sealing between the other ends of the shell 1 and the guide member 2.

[0042] In this embodiment, three second sealing ribs 26 arranged at intervals and in an annular structure are provided on the first sealing body 22. The second sealing ribs 26 can effectively make up for the installation gap between the second sealing sleeve 6 and the inner cavity of the shell 1 on the one hand, thereby achieving gap compensation and improving the sealing effect. On the other hand, multiple second sealing ribs 26 arranged at intervals abut against the inner cavity of the shell 1 to form multiple seals.

[0043] A temperature sensor 27 for detecting the temperature of the guide member 2 or the liquid outlet of the guide cavity is disposed on the positioning ring portion 24 . The temperature sensor 27 includes a temperature probe that is in direct contact with the liquid.

[0044] In this embodiment, the positioning ring 24 is provided with a fixing hole, and the temperature sensor 27 is fixed on the mounting bracket. The mounting bracket is provided with an assembly hole, and both the fixing hole and the assembly hole are threaded holes for inserting screws, so that the temperature sensor 27 is fixed on the positioning ring 24. The temperature probe of the temperature sensor 27 can be directly extended into the diversion cavity and close to the liquid outlet end of the diversion cavity.

[0045] A heating film 28 is provided on the outer surface of the shell 1, and the heating film 28 covers the outer surface of the shell 1. A plurality of spiral blades 29 are provided on the guide member 2 at intervals. When the shell 1 and the guide member 2 are assembled, a guide cavity with a spiral flow channel 30 is formed between the spiral blades 29 and the inner wall of the inner cavity of the shell 1. The guide member 2 is provided with a water inlet joint 31 and a water outlet joint 32 connected to the guide cavity; a bracket 34 for installing a thermostat 33 is provided on the shell 1, and a plurality of plug-in terminals 35 are provided on the bracket 34 at intervals. The temperature sensor 27, the thermostat 33 and the heating film 28 are electrically connected to the corresponding connecting terminals 35 through wires respectively; the water inlet joint 31 and the water outlet joint 32 are integrally formed at both ends of the body of the guide member 2.

[0046] In this embodiment, a positioning column 36 is provided on the shell 1, and a positioning hole 37 is provided on the bracket 34. When the shell 1 and the bracket 34 are assembled, the positioning column 36 is inserted into the positioning hole 37. A screw cavity for inserting a screw can be provided between the positioning hole 37 and the positioning column 36, and the shell 1 and the bracket 34 are fixedly connected by screws.

[0047] In this embodiment, the water inlet joint 31 and the water outlet joint 32 are integrally formed at both ends of the body of the flow guide member 2, which effectively reduces the number of components of the thick film heater.

[0048] In this embodiment, a first notch is provided on the inner side of one end of the guide member 2 corresponding to the water inlet joint 31, and a second notch is provided on the inner side of the other end of the guide member 2 corresponding to the water outlet joint 32. The water inlet joint 31 is connected to the guide cavity through the first notch; the water outlet joint 32 is connected to the guide cavity through the second notch.

[0049] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A thick film heater for heating a liquid, comprising a housing (1) and a flow guide (2), wherein the housing (1) and the flow guide (2) are assembled to form a flow guide cavity for containing the liquid and guiding the flow of the liquid; the characteristics are as follows: A sealing sleeve assembly (3) is provided at the joint between the shell (1) and the flow guide member (2) along the direction of the liquid inlet and outlet of the flow guide cavity, and the sealing sleeve assembly (3) is sleeved on the flow guide member (2); after being assembled, the shell (1) and the flow guide member (2) are in close contact with the sealing sleeve assembly (3), and the shell (1) and the flow guide member (2) clamp the sealing sleeve assembly (3) to each other, so that a sealed assembly is formed between the shell (1) and the flow guide member (2), and the flow guide cavity forms a relatively closed cavity.

2. The thick film heater for heating a liquid according to claim 1, characterized in that: The sealing sleeve assembly (3) comprises a first sealing sleeve (4) and a sealing end cover (5) arranged in the direction of the liquid inlet end of the flow guide member (2), and a second sealing sleeve (6) arranged in the direction of the liquid outlet end of the flow guide member (2); the first sealing sleeve (4) and the second sealing sleeve (6) are respectively sleeved on the flow guide member (2); the sealing end cover (5) and the flow guide member (2) are tightly assembled; the housing (1) and the flow guide member (2) respectively clamp the first sealing sleeve (4) with the sealing end cover (5) to form a sealing portion in the direction of the liquid inlet end of the flow guide chamber; and the housing (1) and the flow guide member (2) clamp the second sealing sleeve (6) with the peripheral sides thereof under the action of the sealing end cover (5) tightly clamping the flow guide member (2) to form a sealing portion in the direction of the liquid outlet end of the flow guide chamber.

3. The thick film heater for heating a liquid according to claim 1, characterized in that: The flow guide member (2) is provided with a step portion (7) in the direction of the liquid inlet end of the flow guide cavity. The flow guide member (2) is provided with a first sealing sleeve (4) and a sealing end cover (5) constituting a sealing sleeve assembly (3). The first sealing sleeve (4) comprises a first sealing portion (9), a second sealing portion (10) and a third sealing portion (11). When the housing (1), the flow guide member (2), the first sealing sleeve (4) and the sealing end cover (5) are assembled, the first sealing sleeve (4) is sleeved on the outer side of the flow guide member (2), and the first sealing portion (9) abuts against the step portion (7), the second sealing portion (10) abuts against the inner cavity wall of the housing (1), one end of the third sealing portion (11) abuts against an outer end surface of the housing (1), and the sealing end cover (5) is buckled on the flow guide member (2) and presses the other end of the third sealing portion (11), so that the housing (1), the flow guide member (2) and the sealing end cover (5) respectively clamp the first sealing sleeve (4) to each other.

4. The thick film heater for heating liquid according to claim 3, characterized in that: The second sealing portion (10) is provided with one or more first sealing ribs (12) abutting against the inner wall surface of the shell (1); the sealing end cover (5) comprises a cover body (20) abutting against the third sealing portion (11); the outer diameter of the third sealing portion (11) is larger than the outer diameter of the shell (1) and / or the cover body (20); the third sealing portion (11) of the first sealing sleeve (4) completely covers an outer end of the shell (1) to achieve end face sealing between the shell (1) and one end of the flow guide member (2).

5. The thick film heater for heating liquid according to claim 2 or 3, characterized in that: The first sealing sleeve (4) is provided with an assembly cavity (13), the sealing end cover (5) comprises an assembly portion (14) inserted into the assembly cavity (13), and the assembly cavity (13) is provided with a matching rib (15) abutting against the assembly portion (14).

6. A thick film heater for heating a liquid according to claim 2 or 3, characterized in that: The first sealing sleeve (4) is provided with a first groove portion (17) sleeved on the flow guide member (2), and the sealing end cover (5) is provided with a second groove portion (18) sleeved on the flow guide member (2); the flow guide member (2) is provided with a buckling groove (16), and the sealing end cover (5) is provided with a buckling rib (19); when the flow guide member (2) and the sealing end cover (5) are tightly buckled, the buckling rib (19) is limitedly buckled on the buckling groove (16).

7. The thick film heater for heating liquid according to claim 1 or 3, characterized in that: The flow guide member (2) is provided with a positioning groove portion (21) and a positioning ring portion (24) in the direction of the liquid outlet end of the flow guide cavity. The flow guide member (2) is provided with a second sealing sleeve (6) constituting one of the sealing sleeve assemblies (3). The second sealing sleeve (6) comprises a first sealing body (22) and a second sealing body (23). When the housing (1), the flow guide member (2) and the second sealing sleeve (6) are assembled, the second sealing sleeve (6) is sleeved on the outer side of the flow guide member (2), and one end of the first sealing body (22) abuts against the outer side of the flow guide member (2), the other end of the first sealing body (22) abuts against the inner cavity wall surface of the housing (1), one end of the second sealing body (23) abuts against the positioning ring portion (24), and the other end of the second sealing body (23) abuts against the other outer end surface of the housing (1), so that the second sealing sleeve (6) is clamped between the housing (1) and the flow guide member (2).

8. The thick film heater for heating a liquid according to claim 7, characterized in that: The second sealing sleeve (6) is provided with a third groove portion (25) sleeved on the outer side of the flow guide member (2); the first sealing body (22) is provided with one or more second sealing convex ribs (26) abutting against the inner wall surface of the shell (1); the outer diameter of the second sealing body (23) is larger than the outer diameter of the positioning ring portion (24) and / or the shell (1); the second sealing body (23) of the second sealing sleeve (6) completely covers the other outer end of the shell (1) to achieve end face sealing between the shell (1) and the other ends of the flow guide member (2).

9. The thick film heater for heating a liquid according to claim 7, characterized in that: A temperature sensor (27) for detecting the temperature of the flow guide member (2) or the liquid outlet of the flow guide cavity is provided on the positioning ring portion (24), and the temperature sensor (27) comprises a temperature probe that is in direct contact with the liquid.

10. The thick film heater for heating a liquid according to claim 9, characterized in that: A heating film (28) is provided on the outer surface of the shell (1), and the heating film (28) covers the outer surface of the shell (1). The flow guide (2) is provided with a plurality of spiral blades (29) arranged at intervals. When the shell (1) and the flow guide (2) are assembled, a flow guide cavity having a spiral flow channel (30) is formed between the spiral blades (29) and the inner wall of the inner cavity of the shell (1). The flow guide (2) is provided with a water inlet joint (31) and a water outlet joint (32) communicating with the flow guide cavity. The shell (1) is provided with a bracket (34) for mounting a thermostat (33), and the bracket (34) is provided with a plurality of plug-in terminals (35) arranged at intervals. The temperature sensor (27), the thermostat (33), and the heating film (28) are respectively electrically connected to corresponding plug-in terminals (35) through wires. The water inlet joint (31) and the water outlet joint (32) are integrally formed at both ends of the body of the flow guide (2).

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