Outer rotor fan and gas water heater

Abstract

The utility model discloses an outer rotor fan and a gas water heater, and relates to the technical field of gas water heaters. The outer rotor fan comprises a stator assembly and a PCB, the stator assembly comprises a shell, a stator winding arranged in the shell and a contact pin, an installation cavity is formed in the shell, one end of the contact pin is electrically connected with the stator winding, and the other end of the contact pin penetrates through the shell and is arranged in the installation cavity. The PCB is arranged in the installation cavity and electrically connected with a conductive terminal, and the contact pin is matched with the conductive terminal in an inserted mode. According to the outer rotor fan, the conductive terminals are directly and electrically connected to the PCB, so that the contact pins are connected with the conductive terminals in an inserted mode to achieve electric connection with the PCB, the welding step is omitted, the assembling efficiency is improved, when the PCB breaks down, the PCB can be directly taken down for maintenance, the maintenance difficulty is reduced, and meanwhile the maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas water heater technical field especially relates to a kind of outer rotor fan and gas water heater. BACKGROUND

[0002] As Figure 1 As shown in the prior art plastic package outer rotor fan is to prevent injection molding impact, generally adopt the design scheme of embedding PCB board 2 into the mounting cavity 131 of stator assembly 1, PCB board 2 and the pin 12 on stator winding 11 are fixed by welding mode.This structure can resist injection molding stress, but leads to significant maintenance defects: when fan appears electric control fault, because pin 12 and PCB board 2 are hard soldered connection, maintenance needs high-temperature de-soldering, PCB board 2 is easily damaged in operation, and maintenance efficiency is low.

[0003] Therefore, an outer rotor fan and gas water heater are needed to solve the above technical problems. UTILITY MODEL CONTENTS

[0004] The first technical problem solved by the utility model is to provide an outer rotor fan, which can effectively solve the problems of high maintenance difficulty and low maintenance efficiency of the existing outer rotor fan;The purpose of reducing the maintenance difficulty and improving the maintenance efficiency of the outer rotor fan is realized.

[0005] The second technical problem solved by the utility model is to provide a gas water heater, which can effectively solve the problems of high maintenance difficulty and low maintenance efficiency of the existing gas water heater;The purpose of reducing the maintenance difficulty and improving the maintenance efficiency of the gas water heater is realized.

[0006] The first technical problem is solved by the following technical scheme:

[0007] The outer rotor fan comprises:

[0008] The stator assembly comprises a housing, a stator winding arranged in the housing and a pin, the housing is provided with a mounting cavity, one end of the pin is electrically connected with the stator winding, and the other end penetrates through the housing and is placed in the mounting cavity;

[0009] The PCB board is arranged in the mounting cavity, the PCB board is electrically connected with a conductive terminal, and the pin is inserted and matched with the conductive terminal.

[0010] The outer rotor fan of the utility model has the beneficial effects compared with the background art:

[0011] The outer rotor fan provided by the utility model, the electrically-conductive terminal is directly connected with the PCB board through the electrically-conductive terminal on the PCB board, so that the pin and the electrically-conductive terminal are plugged together to realize the electrical connection with the PCB board, the welding step is saved, the assembly efficiency is improved, and when the PCB board is faulty, the PCB board can be directly removed for maintenance, the maintenance difficulty is reduced, and the maintenance efficiency is improved.

[0012] In one of the embodiments, the electrically-conductive terminal comprises a lead-in section and a clamping section, the lead-in section is gradually tapered from one end away from the clamping section to the direction close to the clamping section, and the pin enters the clamping section from the lead-in section and is clamped in the clamping section.

[0013] In one of the embodiments, one side of the longitudinal section of the lead-in section is provided as a vertical reference surface, and the other side is provided as an inclined surface.

[0014] In one of the embodiments, the outer rotor fan further comprises a cover plate, the cover plate is arranged on the top end of the mounting cavity, and the cover plate is used for sealing the mounting cavity.

[0015] In one of the embodiments, the cover plate is provided with a heat-conducting material, the PCB board is provided with a power device, and the power device is abutted on the heat-conducting material.

[0016] In one of the embodiments, one side of the cover plate close to the PCB board is provided with a connecting column, the connecting column is provided with a first threaded hole, the PCB board is provided with a first connecting hole, and a first screw is screwed through the first connecting hole and the first threaded hole.

[0017] In one of the embodiments, the connecting columns are arranged at intervals along the circumferential direction of the cover plate, and along the radial direction of the cover plate, the heat-conducting material is located on the inner side of the connecting columns.

[0018] In one of the embodiments, the circumferential direction of the cover plate is provided with a second connecting hole at intervals, along the radial direction of the cover plate, the second connecting hole is located on the outer side of the connecting column, the end surface of the mounting cavity is provided with a second threaded hole at intervals, and a second screw is connected through the second connecting hole and the second threaded hole.

[0019] In one of the embodiments, the heat-conducting material is heat-conducting silicone grease or heat-conducting silica gel.

[0020] The second technical problem is solved by the following technical scheme:

[0021] The gas water heater comprises the outer rotor fan according to any one of the above schemes.

[0022] Compared with the background art, the gas water heater has the beneficial effects that:

[0023] The gas water heater provided by the utility model has the outer rotor fan, and the convenience and efficiency of maintenance are improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings by those skilled in the art without any creative labor.

[0025] Figure 1 is the sectional view of the outer rotor fan provided in the prior art;

[0026] Figure 2 is the sectional view of the outer rotor fan provided in the embodiments of the utility model;

[0027] Figure 3 is the sectional view of the PCB and the cover plate after being connected provided in the embodiments of the utility model;

[0028] Figure 4 is the sectional view of the stator assembly provided in the embodiments of the utility model.

[0029] In the drawings:

[0030] 1, stator assembly;11, stator winding;12, pin;13, shell;131, mounting cavity;132, second threaded hole;133, center column;1331, hollow cavity;

[0031] 2, PCB;21, conductive terminal;211, lead-in section;212, clamping section;22, power device;23, center hole;

[0032] 3, cover plate;31, heat-conducting material;32, connecting column;321, first threaded hole;33, second connecting hole;

[0033] 41, first screw;42, second screw. DETAILED DESCRIPTION

[0034] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further illustrated by specific embodiments in combination with the drawings.

[0035] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two element internal communication or two element mutual action relation. For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.

[0036] As Figures 2-4 The utility model provides a kind of outer rotor fan, including stator assembly 1, rotor assembly (not shown in drawing) and PCB board 2, stator assembly 1 includes shell 13, stator winding 11 and pin 12 being arranged in shell 13, installation cavity 131 is provided in shell 13, one end of pin 12 is electrically connected with stator winding 11, the other end penetrates shell 13 and is placed in installation cavity 131.Pin 12 is the interface of stator winding 11 and PCB board 2, one end of pin 12 is directly embedded in stator winding 11 by crimping or welding.Installation cavity 131 is also provided with center column 133, hollow cavity 1331 is also provided in center column 133, rotor assembly cooperates with hollow cavity 1331, rotates around the axis of stator assembly 1.Stator winding 11 generates rotating magnetic field after electrification, drives rotor assembly to rotate.PCB board 2 receives external instruction, dynamically adjusts the frequency, phase and amplitude of output current.

[0037] PCB board 2 is located in installation cavity 131, and PCB board 2 is electrically connected with conductive terminal 21, and pin 12 is plugged with conductive terminal 21.The outer rotor fan directly connects conductive terminal 21 by PCB board 2, so that pin 12 and conductive terminal 21 can be plugged to realize electrical connection with PCB board 2, which saves the step of welding and improves assembly efficiency.When PCB board 2 fails, PCB board 2 can be directly removed for maintenance, which reduces the difficulty of maintenance and improves the efficiency of maintenance.

[0038] PCB board 2 is provided with center hole 23, and when PCB board 2 is installed in installation cavity 131, center hole 23 is used to avoid center column 133.

[0039] In an embodiment, as Figure 3 Conductive terminal 21 includes lead-in section 211 and clamping section 212, lead-in section 211 gradually shrinks in caliber from the end away from clamping section 212 to the direction close to clamping section 212, and pin 12 enters clamping section 212 from lead-in section 211 and is clamped therein.Lead-in section 211 plays a guiding role for the insertion of pin 12, ensuring that pin 12 can smoothly enter conductive terminal 21, and clamping section 212 clamps pin 12 by its own structure, ensuring the stability of electrical connection.

[0040] In the embodiment, the conductive terminal 21 is an elastic terminal, one end of which is electrically connected to the conductive pad of the PCB 2 by surface mounting or through-hole plug-in cooperation, and the other end is bent into the central hole 23 and forms a socket, which includes a lead-in section 211 and a clamping section 212. The elastic terminal is made of beryllium copper alloy or nickel-titanium memory alloy, etc. which has both electrical conductivity and high elasticity.

[0041] Of course, in other embodiments, a through hole can also be provided on the PCB 2, and a spring plate is welded in the through hole to form the socket of the conductive terminal 21.

[0042] Further, the longitudinal section of the lead-in section 211 adopts an asymmetric guide structure, one side of which is a vertical reference surface, and the other side is an inclined surface. When the pin 12 enters along the insertion direction, the tapered inclined surface forms a self-centering effect through geometric constraints. The initial contact point between the front end of the pin 12 and the inclined surface generates a radial force, which pushes the pin 12 to deviate towards the vertical reference surface until one side of the pin 12 is in contact with the vertical reference surface. During this process, the contact area between the pin 12 and the lead-in section 211 gradually transitions from a single point on the inclined surface to the entire vertical reference surface. Finally, when the pin 12 enters the clamping section 212, it has achieved zero-gap positioning.

[0043] The linear tapered inclined surface and the end surface of the conductive terminal 21 are connected by a circular arc chamfer, which eliminates the stress concentration point of the traditional right-angle structure through geometric smooth transition. When the pin 12 is inserted, the circular arc chamfer forms a multi-section contact guide. The front end of the pin 12 first contacts the circular arc surface, and the contact point slides along the tangent direction of the circular arc, avoiding scratching and falling off the plating layer of the pin 12, and then the pin 12 slides along the tapered inclined surface.

[0044] In an embodiment, the outer rotor fan further comprises a cover plate 3, which is arranged on the top end of the mounting cavity 131. The cover plate 3 is used to seal the mounting cavity 131, and plays a sealing and protective role for the mounting cavity 131.

[0045] In an embodiment, the side of the cover plate 3 close to the PCB 2 is provided with a connecting column 32, and the connecting column 32 is provided with a first threaded hole 321. The PCB 2 is provided with a first connecting hole, and a first screw 41 is screwed through the first connecting hole and the first threaded hole 321. The PCB 2 and the cover plate 3 are detachably connected by the first screw 41 to form an assembly. During installation, the assembly of the PCB 2 and the cover plate 3 after connection is directly arranged on the mounting cavity 131, the pin 12 is inserted into the conductive terminal 21, and the PCB 2 is electrically connected with the stator assembly 1 at the same time, and the mounting cavity 131 is sealed. During maintenance, the assembly of the PCB 2 and the cover plate 3 is first detached from the stator assembly 1, and then the PCB 2 and the cover plate 3 are separated, so that the PCB 2 can be individually maintained or replaced, further improving the operation convenience.

[0046] In an embodiment, the cover plate 3 is provided with a heat-conducting material 31, and the PCB board 2 is provided with a power device 22 abutting against the heat-conducting material 31. The power device 22 includes an IC (Integrated Circuits) and a MOS (Metal Oxide Semiconductor), and a large amount of heat is generated during the operation of the PCB board 2. In order to dissipate the heat of the power device 22, the heat-conducting material 31 is arranged on the side of the cover plate 3 close to the PCB board 2, and the power device 22 is arranged on the side of the PCB board 2 close to the cover plate 3. After the cover plate 3 is connected to the PCB board 2, the power device 22 abuts against the heat-conducting material 31, and the heat-conducting material 31 dissipates the heat of the power device 22.

[0047] Specifically, the heat-conducting material 31 is a heat-conducting silicone grease or a heat-conducting silicone gel. The heat-conducting rate of the heat-conducting silicone grease or the heat-conducting silicone gel is 5.0 W / Mk, which can quickly conduct the heat generated by the power device 22 to the cover plate 3, and then dissipate the heat to the air through the cover plate 3, thereby improving the heat dissipation efficiency, reducing the temperature rise of the power device 22, improving the reliability, and prolonging the service life.

[0048] Further, the cover plate 3 is an aluminum plate, and the heat-conducting rate of aluminum is 205 W / Mk. Arranging the cover plate 3 as an aluminum plate further improves the heat dissipation efficiency of the power device 22.

[0049] In an embodiment, the connecting columns 32 are arranged at intervals along the circumferential direction of the cover plate 3, and the heat-conducting material 31 is arranged on the inner side of the connecting columns 32 along the radial direction of the cover plate 3. The connecting columns 32 arranged at intervals along the circumference of the cover plate 3 form a positioning and supporting frame, and the heat-conducting material 31 is arranged in the enclosed area of the frame. When the first screw 41 is used to lock and fix the PCB board 2 and the connecting columns 32, the uniform arrangement of the plurality of connecting columns 32 can effectively disperse the installation stress, avoid the power device 22 from being deviated due to local stress concentration, and ensure that the power device 22 and the heat-conducting material 31 always maintain stable and close contact. At the same time, the constraint frame formed by the connecting columns 32 limits the thermal deformation displacement of the PCB board 2, so that the heat generated by the power device 22 can be continuously conducted to the heat-conducting material 31 through the maximum contact area, and the heat conduction efficiency is significantly improved.

[0050] In an embodiment, the cover plate 3 is provided with second connecting holes 33 at intervals along the circumferential direction, and the second connecting holes 33 are located on the outer side of the connecting columns 32. Second threaded holes 132 are arranged at intervals on the end face of the mounting cavity 131, and the second screw 42 is connected through the second connecting hole 33 and the second threaded hole 132. The cover plate 3 is fixed to the stator assembly 1 through the second screw 42, so that the combined assembly of the PCB board 2 and the cover plate 3 is detachably connected to the stator assembly 1, which is convenient for disassembly and assembly during maintenance.

[0051] Of course, in other embodiments, the cover plate 3 can be detachably connected with the stator assembly 1 by means of clamping or plugging, etc.

[0052] The embodiment also provides a gas water heater, which comprises the outer rotor fan.

[0053] The above is only the preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as limiting the present application.

Claims

1. An external rotor fan, characterized by, The outer rotor fan comprises a stator assembly (1) and a PCB board (2). The stator assembly (1) comprises a shell (13), a stator winding (11) arranged in the shell (13), and a pin (12) having one end electrically connected with the stator winding (11) and the other end penetrating through the shell (13) and arranged in a mounting cavity (131) in the shell (13). The PCB board (2) is arranged in the mounting cavity (131) and electrically connected with a conductive terminal (21), and the pin (12) is inserted into the conductive terminal (21).

2. The outer rotor fan according to claim 1, characterized in that The conductive terminal (21) comprises a lead-in section (211) and a clamping section (212), the lead-in section (211) is gradually tapered from the end away from the clamping section (212) to the end close to the clamping section (212), and the pin (12) enters the clamping section (212) from the lead-in section (211) and is clamped in the clamping section (212).

3. The outer rotor fan according to claim 2, characterized in that One side of the longitudinal section of the lead-in section (211) is arranged as a vertical reference surface, and the other side is arranged as an inclined surface.

4. The outer rotor fan according to claim 1, characterized in that, The outer rotor fan further comprises a cover plate (3) arranged on the top end of the mounting cavity (131), and the cover plate (3) is used for sealing the mounting cavity (131).

5. The outer rotor fan according to claim 4, characterized in that The cover plate (3) is provided with a heat-conducting material (31), the PCB board (2) is provided with a power device (22), and the power device (22) abuts against the heat-conducting material (31).

6. The outer rotor fan according to claim 5, characterized in that The side of the cover plate (3) close to the PCB board (2) is provided with a connecting column (32), the connecting column (32) is provided with a first threaded hole (321), the PCB board (2) is provided with a first connecting hole, and a first screw (41) passes through the first connecting hole and is screwed with the first threaded hole (321).

7. The outer rotor fan according to claim 6, characterized in that The connecting columns (32) are arranged at intervals along the circumferential direction of the cover plate (3), and the heat-conducting material (31) is located on the inner side of the connecting columns (32) along the radial direction of the cover plate (3).

8. The outer rotor fan according to claim 6, characterized in that The cover plate (3) is provided with a second connecting hole (33) at intervals along the circumferential direction, the second connecting hole (33) is located on the outer side of the connecting columns (32) along the radial direction of the cover plate (3), the end surface of the mounting cavity (131) is provided with a second threaded hole (132) at intervals, and a second screw (42) passes through the second connecting hole (33) and is connected with the second threaded hole (132).

9. The external rotor fan of claim 5, wherein The heat-conducting material (31) is heat-conducting silicone grease or heat-conducting silica gel.

10. A gas water heater characterised by, The outer rotor fan comprises the stator assembly (1) and the PCB board (2) according to any one of claims 1-9.

Images