Pump

Abstract

The present invention provides a pump, comprising a housing with a receiving cavity, a driving device installed at one end of the housing, and a heating device extending into the receiving cavity, wherein the housing comprises a mounting portion for fixing the heating device, the mounting portion comprises a mounting wall formed on the housing and a mounting shell assembled and matched with the mounting wall, the driving device is provided with a driving shaft extending into the receiving cavity, the heating device comprises a heating tube extending in a spiral shape, a first fixed tube portion located at one end of the heating tube, and a second fixed tube portion located at the other end of the heating tube, the extension directions of the first fixed tube portion and the second fixed tube portion are parallel to each other, and in the assembly direction of the mounting shell, the first fixed tube portion and the second fixed tube portion extend obliquely into the receiving cavity. The pump of the present invention not only has good liquid heating and pumping efficiency, but also has a compact installation structure.

Description

Technical Field

[0001] The invention relates to a pump. Background Art

[0002] In the related technology, pumps have developed from single functions to multi-functions, that is, multiple functions are integrated into the same pump, which puts forward higher requirements on the structural design of the pump. Summary of the invention

[0003] The object of the present invention is to provide a pump with a compact installation structure.

[0004] To achieve the above-mentioned purpose, the present invention provides a pump, comprising a cover shell having a receiving cavity, a driving device installed at one end of the cover shell, and a heating device extending into the receiving cavity, the cover shell comprising a mounting portion for fixing the heating device, the mounting portion comprising a mounting wall formed on the cover shell and a mounting shell assembled and matched with the mounting wall, the driving device is provided with a driving shaft extending into the receiving cavity, the heating device comprises a spirally extending heating tube, a first fixed tube portion located at one end of the heating tube, and a second fixed tube portion located at the other end of the heating tube, the extension directions of the first fixed tube portion and the second fixed tube portion are parallel to each other, and in the assembly direction of the mounting shell, the first fixed tube portion and the second fixed tube portion extend obliquely into the receiving cavity.

[0005] Optionally, in the assembly direction of the mounting shell, there is an angular difference between the extension direction of the first fixed tube portion and the second fixed tube portion and the horizontal direction.

[0006] Optionally, the angle difference is 8 to 20 degrees.

[0007] Optionally, in the axial direction of the drive shaft, the first fixed tube portion and the second fixed tube portion are arranged left and right, and a direction perpendicular to both the assembly direction of the mounting shell and the axial direction of the drive shaft is defined as a first direction. In the first direction, the first fixed tube portion and the second fixed tube portion are arranged up and down.

[0008] Optionally, the mounting shell is arranged in a rectangular shape, and a line connecting the first fixed tube portion and the second fixed tube portion is located on a diagonal line of the mounting shell.

[0009] Optionally, the first fixed tube portion extends along a center line direction of a circular ring formed by the heating tube spiral, and an extension direction of the second fixed tube portion is tangent to an outer edge of the heating tube.

[0010] Optionally, the heating device further comprises a fuse arranged on the second fixed tube portion, and the fuse is arranged at a connection position between the second fixed tube portion and the heating tube.

[0011] Optionally, the second fixed tube portion and the fuse are arranged close to the top of the cover shell.

[0012] Optionally, the cover shell is provided with a liquid outlet pipe connected to the accommodating cavity along the assembly direction of the mounting shell, and the liquid outlet pipe is provided with an outlet end extending beyond the cover shell, and in the assembly direction of the mounting shell, the outlet end is arranged opposite to the mounting portion.

[0013] Optionally, the cover shell is also provided with a liquid inlet pipe connected to the receiving chamber along the axial direction of the drive shaft, and the pump also includes a pressure switch connected to the heating device signal, the pressure switch is arranged in the cover shell and is located above the liquid inlet pipe in the axial direction of the drive shaft, and the pressure switch is provided with a pressure taking port, and the pressure taking port is arranged opposite to the receiving chamber.

[0014] Optionally, the pressure switch is located between the liquid inlet pipe and the heating device in the assembly direction of the mounting shell, and the cable of the pressure switch and the cable of the heating device are located on the same side.

[0015] It can be seen from the above technical solutions that the pump of the present invention arranges the first fixed pipe part and the second fixed pipe part to extend obliquely into the accommodating cavity in the assembly direction of the mounting shell, thereby not increasing the overall height of the pump and making the mounting structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the pump of the present invention.

[0017] Figure 2 yes Figure 1 Another angle schematic diagram of the pump structure shown.

[0018] Figure 3 yes Figure 2 Schematic diagram of the cross section along the AA direction.

[0019] Figure 4 yes Figure 1 Schematic diagram of the structure of the pump without the drive device.

[0020] Figure 5 yes Figure 4 Another perspective schematic diagram of the pump structure after the drive device is removed.

[0021] Figure 6 yes Figure 5 Schematic diagram of the cross section along the BB direction.

[0022] Figure 7 yes Figure 1 Schematic diagram of the structure of the heating device.

[0023] Figure 8 yes Figure 7 A schematic diagram of the structure of the heating device after being assembled with the mounting shell is shown.

[0024] Reference numerals:

[0025] 100-pump; 1-cover; 10-accommodating chamber; 11-main body; 111-guiding groove; 12-mounting part; 121-mounting wall; 1211-protrusion; 122-mounting shell; 1221-through hole; 13-liquid inlet pipe; 14-liquid outlet pipe; 141-outlet end; 2-driving device; 21-driving shaft; 22-motor rotor; 23-motor stator assembly; 24-liquid separation plate; 241-sealing ring; 25-support assembly; 251- bracket; 252- bearing; 3- impeller; 31- central axis; 32- impeller blades; 33- liquid inlet; 34- extension wall; 340- inner cavity; 4- heating device; 41- heating tube; 410- annular tube portion; 42- first fixed tube portion; 43- second fixed tube portion; 44- connecting portion; 441- riveted plate; 442- mounting plate; 443- locking nut; 444- sealing gasket; 45- fuse; 5- pressure switch. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figure 1 to Figure 3 As shown, the present invention discloses a pump 100. The pump 100 comprises a casing 1, a driving device 2 mounted at one end of the casing 1, an impeller 3 connected to the driving device 2 and accommodated in the casing 1, and a heating device 4 extending into the casing 1.

[0028] See also Figures 4 to 6 Combined with Figure 3 As shown, the housing 1 includes a main body 11 arranged in a columnar shape, a receiving cavity 10 formed in the main body 11 , and a mounting portion 12 extending outward from one side of the main body 11 for fixing the heating device 4 .

[0029] The main body 11 is recessed on one side of the receiving chamber 10 to form a guide groove 111. The guide groove 111 is extended in a spiral shape, and such a configuration can effectively increase the contact area between the liquid and the guide groove 111, further achieving the purpose of increasing the volume of the receiving chamber 10 and increasing the pressure energy in the receiving chamber 10. At the same time, the guide groove 111 is also provided with an inlet end (not shown) close to the impeller 3 and an outlet end (not shown) corresponding to the inlet end.

[0030] The mounting portion 12 includes a mounting wall 121 formed on the main body 11, a mounting groove (not numbered) located in the mounting wall 121, and a mounting shell 122 for closing the mounting groove. The mounting groove and the mounting shell 122 are both substantially rectangular, and one end of the mounting groove is connected to the receiving cavity 10, and the other end is matched with the mounting shell 122; the mounting shell 122 is fixedly connected to the heating device 4.

[0031] The mounting shell 122 is fixedly mounted on the mounting wall 121. In the present embodiment, the mounting wall 121 and the mounting shell 122 are fixed by snapping. Specifically, the mounting wall 121 is provided with a plurality of protrusions 1211 protruding outward away from the mounting groove, and the mounting shell 122 is correspondingly provided with through holes 1221 for limiting and accommodating the protrusions 1211. The mounting shell 122 is fixed to the mounting wall 121 by the matching clamping of the protrusions 1211 and the through holes 1221 to close the mounting groove. Furthermore, a sealing ring (not shown) is also provided between the mounting wall 121 and the mounting shell 122. Such a configuration can ensure the sealing of the pump 100.

[0032] The housing 1 is further provided with a liquid inlet pipe 13 arranged along the extension direction of the main body 11 and a liquid outlet pipe 14 arranged corresponding to the mounting groove. The pipe wall of the liquid inlet pipe 13 is connected to the main body 11, and one end of the liquid inlet pipe 13 extends into the receiving cavity 10; the pipe wall of the liquid outlet pipe 14 is connected to the main body 11; and the liquid inlet pipe 13 and the liquid outlet pipe 14 are both in communication with the receiving cavity 10.

[0033] In this embodiment, the liquid outlet pipe 14 is provided with an outlet end 141 extending beyond the cover shell 1, and the outlet end 141 is arranged opposite to the mounting portion 12, that is, if the outlet end 141 is located on the rear side or upper side of the cover shell 1, the mounting portion 12 is correspondingly located on the front side or lower side of the cover shell 1; further, the liquid outlet pipe 14 is arranged close to the outlet end of the guide groove 111, and the liquid outlet pipe 14 is connected to the outlet end. Such an arrangement can facilitate the liquid in the accommodating cavity 10 to flow out quickly along the guide groove 111 and the liquid outlet pipe 14.

[0034] The driving device 2 is provided with a driving shaft 21 extending into the accommodating cavity 10, a motor rotor 22 surrounding the outer circumference of the driving shaft 21, a motor stator assembly 23 surrounding the outer circumference of the motor rotor 22, a liquid separation plate 24 separating the motor rotor 22 from the motor stator assembly 23, and a supporting assembly 25 for supporting and fixing the driving shaft 21.

[0035] In this embodiment, the drive shaft 21 and the liquid inlet pipe 13 have the same extension direction, and the mounting portion 12 and the liquid outlet pipe 14 are relatively arranged along the assembly direction of the mounting shell 122; the liquid separator 24 cooperates with the main body 11 to separate the motor rotor 22 and the motor stator assembly 23, thereby achieving water and electricity separation between the motor rotor 22 and the motor stator assembly 23; further, in this embodiment, a sealing ring 241 is also provided between the liquid separator 24 and the main body 11 of the cover shell 1, that is, the sealing ring 241 is clamped between the main body 11 and the liquid separator 24 along the axial direction of the drive shaft 21 to enhance the sealing effect between the main body 11 and the liquid separator 24.

[0036] It should be noted that the assembly direction of the mounting shell 122 refers to the direction in which the mounting shell 122 is assembled and matched with the mounting wall 121, that is, the direction in which the mounting shell 122 gradually moves from a position far away from the mounting wall 121 toward a position close to the mounting wall 121, and the direction in which the mounting shell 122 is assembled and matched with the mounting wall 121 is the same as the direction in which the liquid outlet pipe 14 extends from the main body 11 toward the outlet end 141.

[0037] The support assembly 25 includes a bracket 251 and two bearings 252 for fixing the drive shaft 21. The drive shaft 21 passes through the bracket 251 and is fixed to the liquid separation plate 24 and the bracket 251 through the bearings 252. The bracket 251 is connected and positioned on the liquid separation plate 24 and is arranged perpendicular to the axial direction of the drive shaft 21 to separate the receiving chamber 10 from the motor rotor 22. Specifically, the motor rotor 22 is received in a space formed by the liquid separation plate 24 and the bracket 251. The liquid in the receiving chamber 10 can enter the liquid separation plate 24 along the gap at the connection position between the bracket 251 and the liquid separation plate 24, and contact the motor rotor 22 to take away the heat generated during the operation of the motor rotor 22, so as to prevent the abnormal use of the pump 100 caused by the excessively high working temperature of the motor rotor 22, thereby achieving the purpose of extending the service life of the pump 100 of the present invention.

[0038] The impeller 3 is provided with a central axis 31 fixed on the driving shaft 21, a plurality of impeller blades 32 arranged around the central axis 31, a liquid inlet 33 located at one end of the central axis 31 and away from the driving device 2, an extension wall 34 formed around the edge of the liquid inlet 33, and an inner cavity 340 formed in the extension wall 34. The central axis 31 drives the impeller 3 to rotate under the action of the driving shaft 21; a liquid outlet (not numbered) arranged along the radial direction of the driving shaft 21 is formed between the adjacent impeller blades 32, and the liquid outlet is arranged near the inlet end of the guide groove 111; the extension wall 34 is arranged to abut against the wall of the liquid inlet pipe 13, so that the inner cavity 340 is connected with the liquid inlet pipe 13, and further connected with the inner cavity 340 and the receiving chamber 10.

[0039] See also Figure 7 , Figure 8 Combined with Figure 5 , Figure 6 As shown, the heating device 4 includes a heating tube 41 accommodated in the receiving chamber 10, a first fixed tube portion 42 located at one end of the heating tube 41, a second fixed tube portion 43 located at the other end of the heating tube 41, and a connecting portion 44 for fixing the first fixed tube portion 42 and the second fixed tube portion 43. The heating tube 41 extends in a spiral shape and forms at least one annular tube portion 410, and the annular tube portion 410 surrounds the outer periphery of the extension wall 34; so that the heating tube 41 can directly contact with the liquid in the receiving chamber 10 for heat exchange, effectively improving the heating efficiency of the liquid in the receiving chamber 10. Further, the spiral direction of the heating tube 41 (i.e., the annular tube portion 410) is substantially the same as the spiral direction of the guide groove 111. Such a configuration can effectively improve the space utilization rate of the receiving chamber 10, so that the liquid in the guide groove 111 is fully in contact with the heating tube 41, and the heating uniformity when the heating tube 41 heats the liquid is ensured.

[0040] It should be noted that the annular tube portion 410 is not a complete ring, but is defined as the annular tube portion 410 for the convenience of describing the extension direction of the first fixed tube portion 42 and the second fixed tube portion 43 .

[0041] The first fixed pipe part 42 and the second fixed pipe part 43 are received in the installation groove, and obliquely protrude into the receiving cavity 10 along the assembly direction of the installation shell 122 to communicate with the heating pipe 41. Specifically, the extension directions of the first fixed pipe part 42 and the second fixed pipe part 43 are parallel to each other, and the first fixed pipe part 42 extends along the center line direction of the circular ring formed by the spiral of the heating pipe 41 (or the first fixed pipe part 42 extends along the axis of the spiral direction of the heating pipe 41), and the extension direction of the second fixed pipe part 43 is tangent to the outer edge of the heating pipe 41, that is, the first fixed pipe part 42 extends along the center line direction of the annular pipe part 410, and the extension direction of the second fixed pipe part 43 is tangent to the outer edge of the annular pipe part 410.

[0042] In the present invention, in the axial direction of the drive shaft 21, the first fixed tube portion 42 and the second fixed tube portion 43 are arranged left and right (such as Figure 1 As shown in FIG. 1 ), a direction perpendicular to both the assembly direction of the mounting shell 122 and the axial direction of the drive shaft 21 is defined as a first direction, and in the first direction, the first fixed pipe portion 42 and the second fixed pipe portion 43 are arranged up and down (as shown in FIG. Figure 5 Further, in the assembly direction of the mounting shell 122, there is an angle difference α between the extending direction of the first fixed tube portion 42 and the second fixed tube portion 43 and the horizontal direction (as shown in FIG. Figure 5 As shown); the angle difference α is 8 to 20 degrees, preferably, the angle difference α is 10 to 12 degrees. This arrangement can effectively avoid the increase in the volume of the cover shell 1 caused by the installation of the heating device 4, thereby achieving the purpose of reducing the volume of the pump 100; and in an embodiment of the present invention, in the axial direction of the drive shaft 21, the connecting line of the first fixed tube portion 42 and the second fixed tube portion 43 is located on the diagonal line of the mounting groove (or the mounting shell 122). This arrangement can further effectively reduce the volume of the pump 100, and the mounting structure is more compact.

[0043] The first fixed tube portion 42 and the second fixed tube portion 43 are arranged to extend obliquely into the accommodating cavity 10. This is because: for the present invention, the position of the mounting shell 122 is fixed, and the first fixed tube portion 42 and the second fixed tube portion 43 are arranged to have an angle difference α between the assembly direction of the mounting shell 122 and the horizontal direction, and the connecting line of the first fixed tube portion 42 and the second fixed tube portion 43 in the axial direction of the drive shaft 21 is located on the diagonal line of the mounting groove (or the mounting shell 122). Only in this way can the purpose of effectively utilizing the space inside the pump 100 and making the mounting structure more compact be achieved.

[0044] The connecting portion 44 includes a rivet plate 441 connecting the first fixed tube portion 42 and the second fixed tube portion 43 and a mounting plate 442 arranged opposite to the rivet plate 441; the heating tube 41 is connected and fixed to the connecting portion 44 through the first fixed tube portion 42 and the second fixed tube portion 43, and is further fixed to the mounting portion 12. Specifically, during the assembly of the heating device 4 and the mounting portion 12, the rivet plate 441 and the mounting plate 442 are arranged on both sides of the mounting shell 122, and the rivet plate 441 is accommodated in the mounting groove; further, the rivet plate 441 and the mounting plate 442 are positioned and fixed to the mounting shell 122 through the locking nut 443, and are further fixed to the mounting portion 12 through the cooperation of the through hole 1221 on the mounting shell 122 and the protrusion 1211 on the mounting wall 121, so that the heating tube 41 protrudes into the receiving cavity 10 to complete the heating of the liquid.

[0045] In this embodiment, a sealing gasket 444 is further provided between the riveted plate 441 and the mounting shell 122. Such a configuration can effectively prevent the liquid in the accommodating cavity 10 from flowing out through the gap at the connection position between the connecting portion 44 and the mounting shell 122, thereby improving the sealing performance of the pump 100 of the present invention.

[0046] The heating device 4 also includes a fuse 45 arranged on the second fixed tube portion 43. The fuse 45 is set with a predetermined limit temperature. When the temperature of the heating tube 41 in the accommodating cavity 10 reaches the limit temperature, the fuse 45 disconnects the heating circuit (not shown) of the heating device 4, so that the heating device 4 stops heating the fluid, thereby protecting the pump 100 from safety accidents caused by overheating.

[0047] In this embodiment, the fuse 45 is arranged at the connection position between the second fixed pipe part 43 and the heating pipe 41. Specifically, in the actual application process of the pump 100, the situation where the local temperature of the heating device 4 is too high often occurs at a position close to the top of the housing 1. Therefore, in the present invention, in the first direction, the second fixed pipe part 43 is located above the first fixed pipe part 42, and the second fixed pipe part 43 and the fuse 45 are arranged close to the top of the housing 1 (see FIG. 1 ). Figure 5 As shown in FIG. 1 ), the fuse 45 can monitor the temperature of the heating device 4 in real time and respond quickly when the heating device 4 has a local high temperature, thereby ensuring the safety of the pump 100 of the present invention. It should be noted that “the position close to the top of the housing 1” actually refers to the position in the first direction (such as Figure 5 As shown) is located at the upper side of the cover shell 1.

[0048] The pump 100 further includes a pressure switch 5 connected to the heating device 4 by signal. The pressure switch 5 is arranged on the housing 1 and is located above the liquid inlet pipe 13 in the axial direction of the drive shaft 21. Such an arrangement can effectively prevent the pump 100 from having residual liquid volume at the position of the pressure switch 5 during the liquid discharge process. Furthermore, the pressure switch 5 is located between the liquid inlet pipe 13 and the heating device 4 in the assembly direction of the mounting shell 122, and the cable of the pressure switch 5 and the cable of the heating device 4 are located on the same side to facilitate the installation and wiring of the pump 100 and improve the practicality and user experience of the pump 100.

[0049] The pressure switch 5 is also provided with a pressure port (not numbered), which is arranged opposite to the receiving chamber 10 to detect the pressure value in the receiving chamber 10; when the pressure in the receiving chamber 10 reaches a predetermined pressure value, the pressure switch 5 signals the heating device 4 to heat. Further, the pressure port is arranged opposite to the guide groove 111, and a seal (not shown) is arranged between the pressure port and the guide groove 111. The setting of the seal can prevent the dirt remaining in the guide groove 111 from entering the pressure port, causing the pressure port to be blocked, affecting the normal operation of the pressure switch 5, and at the same time, can prevent the liquid in the guide groove 111 from contacting the pressure switch 5, causing corrosion damage to the pressure switch 5; on the other hand, the liquid pressure in the guide groove 111 can be more accurately transmitted to the pressure switch 5, ensuring the accuracy of the pressure switch 5 detection.

[0050] When the pump 100 of the present invention is used, first, the liquid enters the inner cavity 340 through the liquid inlet pipe 13, and enters the impeller blades 32 through the liquid inlet 33 under the action of the rotation of the impeller 3; then, it flows out along the liquid outlet between the impeller blades 32 and enters the receiving chamber 10; then, a part of the liquid entering the receiving chamber 10 enters the liquid separation plate 24, contacts the motor rotor 22, takes away the heat generated when the motor rotor 22 is working, and then enters the guide groove 111 driven by the impeller 3, and contacts the heating tube 41 to complete the heating; another part of the liquid directly enters the guide groove 111 through the inlet end, fully contacts the heating tube 41 to complete the heating; finally, the heated liquid enters the liquid outlet pipe 14 from the outlet end and flows out from the outlet end 141; at this time, the heating and pumping of the liquid are completed.

[0051] In summary, the pump 100 of the present invention designs the first fixed pipe portion 42 to extend along the center line direction of the circular ring formed by the spiral of the heating pipe 41, and designs the second fixed pipe portion 43 to extend tangentially along the outer edge of the heating pipe 41, thereby not increasing the overall height of the pump 100 and making the installation structure more compact; at the same time, in the assembly direction of the mounting shell 122, the first fixed pipe portion 42 and the second fixed pipe portion 43 are arranged to extend obliquely into the accommodating cavity 10, thereby avoiding the increase in the size of the cover shell 1 due to the installation of the heating device 4, reducing the overall height and volume of the pump 100 of the present invention, and making the installation structure more compact.

[0052] In addition, by setting the fuse 45 at the connection position between the second fixed pipeline 43 and the heating tube 41, and controlling the fuse 45 to be set close to the top of the cover shell 1, the pump 100 of the present invention can effectively monitor the heating temperature of the heating device 4 in real time to prevent damage to the heating device 4 due to excessive local temperature, thereby ensuring the safety of the pump 100 of the present invention.

[0053] In addition, by arranging the pressure switch 5 above the liquid inlet pipe 13, damage to the pressure switch 5 caused by liquid accumulation can be effectively prevented; further, the cable of the pressure switch 5 and the cable of the heating device 4 are arranged on the same side, which facilitates the installation and wiring of the pump 100 and improves the user experience of the pump 100 of the present invention.

[0054] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative positions in space, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the drawings. It is understood that, depending on the placement of the product, the terms of relative positions in space may be intended to include different orientations in addition to the orientation shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0055] In addition, the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A pump, comprising a housing having a receiving cavity, a driving device mounted on one end of the housing, and a heating device extending into the receiving cavity, wherein the housing comprises a mounting portion for fixing the heating device, the mounting portion comprises a mounting wall formed on the housing and a mounting shell assembled with the mounting wall, the driving device is provided with a driving shaft extending into the receiving cavity, and is characterized in that: The heating device includes a heating tube extending in a spiral shape, a first fixed tube portion located at one end of the heating tube, and a second fixed tube portion located at the other end of the heating tube, wherein the extension directions of the first fixed tube portion and the second fixed tube portion are parallel to each other, the first fixed tube portion extends along the center line direction of the circular ring formed by the spiral of the heating tube, and the extension direction of the second fixed tube portion is tangent to the outer edge of the heating tube, and in the assembly direction of the mounting shell, there is an angle difference between the extension direction of the first fixed tube portion and the second fixed tube portion and the horizontal direction, so as to extend obliquely into the accommodating cavity; in the axial direction of the driving shaft, the first fixed tube portion and the second fixed tube portion are arranged left and right, and a direction perpendicular to both the assembly direction of the mounting shell and the axial direction of the driving shaft is defined as a first direction, and in the first direction, the first fixed tube portion and the second fixed tube portion are arranged up and down.

2. The pump according to claim 1, characterized in that: The angle difference is 8 to 20 degrees.

3. The pump according to claim 1, characterized in that: The installation shell is arranged in a rectangular shape, and a connecting line between the first fixing tube portion and the second fixing tube portion is located on a diagonal line of the installation shell.

4. The pump according to claim 1, characterized in that: The heating device further comprises a fuse arranged on the second fixed tube portion, and the fuse is arranged at a connection position between the second fixed tube portion and the heating tube.

5. The pump according to claim 4, characterized in that: The second fixed tube portion and the fuse are arranged close to the top of the housing.

6. The pump according to claim 1, characterized in that: The cover shell is provided with a liquid outlet pipe connected with the accommodating cavity along the assembly direction of the mounting shell, and the liquid outlet pipe is provided with an outlet end extending beyond the cover shell. In the assembly direction of the mounting shell, the outlet end is arranged opposite to the mounting portion.

7. The pump according to claim 1, characterized in that: The cover shell is also provided with a liquid inlet pipe connected to the receiving chamber along the axial direction of the drive shaft. The pump also includes a pressure switch connected to the heating device signal. The pressure switch is arranged in the cover shell and is located above the liquid inlet pipe in the axial direction of the drive shaft. The pressure switch is provided with a pressure taking port, and the pressure taking port is arranged opposite to the receiving chamber.

8. The pump according to claim 7, characterized in that: The pressure switch is located between the liquid inlet pipe and the heating device in the assembly direction of the mounting shell, and the cable of the pressure switch and the cable of the heating device are located on the same side.

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