A small explosion-proof fan assembly process and small explosion-proof fan

Abstract

The present invention provides a small explosion-proof fan assembly process and a small explosion-proof fan, including a fan motor, a motor fixing cover, a shaft sleeve, a fan blade and an explosion-proof shell, and the assembly process includes: S1, selecting a flexible sheet with uniform thickness, making the total explosion-proof gap of the explosion-proof fan A, and the thickness of the flexible sheet is less than A*1 / 2; S2, cutting the flexible sheet, making the circumference of the rotating shaft of the fan motor B, and the hole depth of the shaft sleeve D, then the width of the flexible sheet is greater than B*1 / 2 and less than B, and the length of the flexible sheet is greater than D; S3, inserting the flexible sheet into the shaft sleeve; S4, inserting the rotating shaft into the shaft sleeve with the flexible sheet; S5, using structural adhesive to stick the fan motor to the motor fixing cover; S6, installing the explosion-proof shell. The present invention uses the thickness of the flexible sheet to locate the gap between the rotating shaft and the shaft sleeve of the fan motor, while ensuring the assembly accuracy, without using any auxiliary tooling fixtures, while reducing the assembly cost, the assembly time is short, and truly achieves cost reduction and efficiency improvement.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof fans, and in particular to an assembly process of a small-sized explosion-proof fan and a small-sized explosion-proof fan. Background Art

[0002] Small explosion-proof fans refer to those with a net volume of explosion-proof enclosure V≤100cm 3 Flameproof fans (i.e. the volume of the outer casing minus the volume of the motor inside the casing); flameproof fans have high requirements on the relative position accuracy of the motor itself, the motor shaft and the sleeve on the flameproof casing, and the sleeve and the flameproof casing. According to the requirements of GB3836 standard, the total flameproof gap between the motor shaft and the sleeve is usually ≤0.2mm, and only 0.1mm on one side when evenly divided. At the same time, the length of its flameproof joint surface must be ≥6mm, so in order to ensure that the shaft and the sleeve do not contact during movement, this has extremely high requirements on assembly accuracy.

[0003] In the prior art, when the shaft and the sleeve are assembled, the motor is usually fixed first, and then the position of the motor is adjusted so that the shaft and the sleeve are assembled together. In this assembly method, the sleeve and the motor shaft cannot be contactless during relative movement, which will cause frequent wear and replacement of the sleeve. Although a series of assembly equipment, tooling, fixtures, etc. can also be used to ensure assembly accuracy, these equipment used to ensure assembly accuracy are expensive, and after being worn out for a period of time, they become scrapped and cannot be used, and the assembly takes a long time.

[0004] Therefore, there is an urgent need for a small explosion-proof fan assembly process and a small explosion-proof fan which can ensure assembly accuracy, reduce assembly costs and shorten assembly time. Summary of the invention

[0005] The main purpose of the present invention is to provide a small explosion-proof fan assembly process and a small explosion-proof fan which can ensure assembly accuracy, reduce assembly costs and shorten assembly time.

[0006] To achieve the above object, the technical solution of the present invention is implemented as follows: a small explosion-proof fan assembly process, including a fan motor, a motor fixing cover, a shaft sleeve, a fan blade and an explosion-proof shell, the shaft sleeve is installed on the motor fixing cover, the fan motor is located in the explosion-proof shell, the rotating shaft of the fan motor passes through the shaft sleeve to the outside of the motor fixing cover and is connected to the fan blade, and the motor fixing cover is connected to the explosion-proof shell; the assembly process includes:

[0007] S1. Select a flexible sheet with uniform thickness: let the total flameproof gap of the flameproof fan be A, then the thickness of the flexible sheet is less than A*1 / 2;

[0008] S2. Cutting the flexible sheet: Let the circumference of the fan motor shaft be B, and the hole depth of the sleeve be D. Then the width of the flexible sheet is greater than B*1 / 2 and less than B, and the length of the flexible sheet is greater than D.

[0009] S3, inserting the flexible sheet into the shaft sleeve: rolling the flexible sheet into a C-shaped cylinder and inserting it into the shaft sleeve;

[0010] S4, inserting the rotating shaft: inserting the rotating shaft of the fan motor into the shaft sleeve with the flexible sheet;

[0011] S5. Fix the fan motor: Use structural adhesive to stick the fan motor to the motor fixing cover, and remove the flexible sheet after the structural adhesive is cured;

[0012] S6. Install the explosion-proof shell: Place the fan motor into the explosion-proof shell and connect the motor fixing cover to the explosion-proof shell.

[0013] Furthermore, in S3, when the flexible sheet is rolled into a C-shaped cylinder, the flexible sheet is wrapped around the rotating shaft of the fan motor to form the C-shaped cylinder, and then the C-shaped cylinder-shaped flexible sheet is removed and inserted into the shaft sleeve.

[0014] A small explosion-proof fan, a small explosion-proof fan assembled by the small explosion-proof fan assembly process, the small explosion-proof fan also includes:

[0015] A plurality of heat dissipation fins are evenly distributed around the explosion-proof shell, and the airflow generated by the rotation of the fan blades will flow through the gap between two adjacent heat dissipation fins.

[0016] Furthermore, it also includes a heat conductive pad arranged between the fan motor body and the inner wall of the explosion-proof shell.

[0017] Furthermore, the shaft sleeve and the motor fixing cover are in interference fit, and the motor fixing cover is provided with a positioning shoulder structure that matches the shaft sleeve.

[0018] Furthermore, a heat pipe mounting hole is provided on the explosion-proof shell, and a heat pipe is arranged thereon, one end of the heat pipe is located in the mounting hole, and the other end is in contact with a cold source.

[0019] The beneficial effects of the present invention are embodied in:

[0020] The present invention uses the thickness of the flexible sheet to locate the gap between the rotating shaft and the sleeve of the fan motor, while ensuring the assembly accuracy, without the need to use any auxiliary fixtures, while reducing the assembly cost, the assembly time is short, and the cost is truly reduced and efficiency is increased. In addition, the fan motor of the present application can be suspended in the explosion-proof shell, so that the gap in the explosion-proof shell can better wrap the body of the fan motor, which helps to improve the explosion-proof performance of the explosion-proof fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the attached picture:

[0022] Figure 1 This is a schematic diagram of the overall structure of the small explosion-proof fan of the present invention;

[0023] Figure 2 This is an exploded view of the small explosion-proof fan described in the present invention;

[0024] Figure 3 It is a half-section view of the small explosion-proof fan described in the present invention.

[0025] Description of reference numerals:

[0026] 1. Fan motor; 2. Motor fixing cover; 3. Bushing; 4. Fan blades; 5. Explosion-proof shell; 51. Heat pipe mounting hole; 52. Heat sink fin; 6. Thermal pad; 7. Heat pipe. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the invention.

[0028] See also Figures 1 to 3 .

[0029] like Figure 1 and Figure 2 As shown, a small explosion-proof fan assembly process includes a fan motor 1, a motor fixing cover 2, a shaft sleeve 3, a fan blade 4 and an explosion-proof shell 5, the shaft sleeve 3 is installed on the motor fixing cover 2, the fan motor 1 is located in the explosion-proof shell 5, the rotating shaft of the fan motor 1 passes through the shaft sleeve 3 to the outside of the motor fixing cover 2 and is connected to the fan blade 4, and the motor fixing cover 2 is detachably installed with the explosion-proof shell 5; the assembly process includes:

[0030] S1. Select a flexible sheet with uniform thickness: let the total flameproof gap of the flameproof fan be A (the specific value of A can be obtained by referring to the national standard. For a small flameproof fan, the total flameproof gap is usually ≤0.2mm), then the thickness of the flexible sheet is less than A*1 / 2 (taking A≤0.2mm as an example, A takes the maximum value, and the thickness of the flexible sheet is <0.1mm); preferably, the thickness of the flexible sheet is greater than A*1 / 4;

[0031] S2. Cutting the flexible sheet: Let the circumference of the shaft of the fan motor 1 be B, and the hole depth of the sleeve 3 be D. Then the width of the flexible sheet is greater than B*1 / 2 and less than B, and the length of the flexible sheet is greater than D;

[0032] S3, inserting the flexible sheet into the shaft sleeve 3: rolling the flexible sheet into a C-shaped cylinder and inserting it into the shaft sleeve 3;

[0033] S4, insert the rotating shaft: insert the rotating shaft of the fan motor 1 into the shaft sleeve 3 with the flexible sheet. When the fan motor 1 is about to reach the installation position, slowly pull the flexible sheet (fan motor side) extending out of the shaft sleeve 3 into the shaft sleeve to prevent the fan motor 1 from pressing the flexible sheet.

[0034] S5, fixing the fan motor 1: using structural adhesive to stick the fan motor 1 to the motor fixing cover 2, and taking out the flexible sheet after the structural adhesive is cured;

[0035] S6. Installing the explosion-proof shell 5: placing the fan motor 1 into the explosion-proof shell 5 and connecting the motor fixing cover 2 and the explosion-proof shell 5 together.

[0036] In a specific implementation, after the staff has cut the flexible sheet and inserted the flexible sheet into the shaft sleeve 3, they can slightly expand the flexible sheet port exposed on the outside with their hands, and then the staff holds the fan motor 1 in one hand and the motor fixing cover 2 in the other hand, and inserts the rotating shaft of the fan motor 1 into the shaft sleeve 3 on the motor fixing cover 2, wherein when the fan motor 1 is about to reach the installation position, the flexible sheet (on the fan motor 1 side) extending out of the shaft sleeve is slowly pulled into the shaft sleeve to prevent the fan motor from pressing the flexible sheet, resulting in the inability to remove it after the structural adhesive is cured; then the fan motor 1 is glued to the motor fixing cover 2 with structural adhesive; wherein the structural adhesive can be first applied to the corresponding position of the motor fixing cover 2, and after the structural adhesive is cured, the flexible sheet is taken out and then the fan motor 1 is placed in the explosion-proof shell 5. It should be noted that the support of the fan motor 1 of the present application depends on the bonding of the structural adhesive, and the fan motor 1 can be suspended in the explosion-proof shell 5; in addition, the reason why the length of the flexible sheet is greater than D is to facilitate the removal of the flexible sheet.

[0037] It should be noted that the object emphasized in this application is a small explosion-proof fan. The reason for this is that when facing a medium or large explosion-proof fan, the size and weight of the motor and the motor fixing cover 2 are relatively large, and it is impossible for the staff to hold the motor in one hand and the motor fixing cover 2 in the other hand, and insert the shaft into the sleeve 3 by hand. Therefore, this assembly process is only applicable to small explosion-proof fans. Of course, if other small motors also have this matching requirement, this assembly process can also be used.

[0038] The present invention uses the thickness of the flexible sheet to locate the gap between the rotating shaft of the fan motor 1 and the sleeve 3, while ensuring the assembly accuracy, without the need to use any auxiliary fixtures, while reducing the assembly cost, the assembly time is short, and the cost is truly reduced and efficiency is increased. In addition, the fan motor 1 of the present application can be suspended in the explosion-proof shell 5, so that the gap in the explosion-proof shell 5 can better wrap the body of the fan motor 1, which helps to improve the explosion-proof performance of the explosion-proof fan.

[0039] Preferably, the width of the flexible sheet is B*3 / 4; the flexible sheet can be made of paper, plastic film, gauze, etc.

[0040] Preferably, the structural adhesive may be AB adhesive.

[0041] Preferably, the fan motor 1 is a shaded pole fan commonly found on the market, and may also be a DC fan or the like.

[0042] In one embodiment, in S3, when the flexible sheet is rolled into a C-shaped cylinder, the flexible sheet is wrapped around the rotating shaft of the fan motor 1 to form the C-shaped cylinder, and then the C-shaped cylinder-shaped flexible sheet is removed and inserted into the shaft sleeve 3. This design makes it easy to roll the flexible sheet into a C-shaped cylinder while ensuring that the inner diameter of the C-shaped cylinder is not too small, and is also easy to insert into the corresponding shaft sleeve 3.

[0043] After the fan motor 1 is installed in the explosion-proof housing 5, the heat dissipation performance is usually reduced, and higher requirements are placed on the insulation level of the fan motor 1, which often needs to be customized. At the same time, in order to prevent the fan motor 1 from overheating and burning, after the fan motor 1 is equipped with a thermal protector, it will stop for a period of time to dissipate heat after overheating. In order to solve such problems, the present invention also discloses a small explosion-proof fan, which is a small explosion-proof fan assembled using the above-mentioned assembly process, and the small explosion-proof fan also includes:

[0044] A plurality of heat dissipation fins 52 are evenly distributed around the explosion-proof shell 5, and the airflow generated by the rotation of the fan blades 4 will flow through the gap between two adjacent heat dissipation fins 52. With this design, the heat dissipation area is increased by the heat dissipation fins 52 on the explosion-proof shell 5, and then the heat is dissipated by the fan blades 4 provided by the explosion-proof fan. The heat dissipation effect is good, and the maximum temperature of the motor winding can be basically consistent with that when it is running at normal temperature, and the motor life of the explosion-proof fan will be greatly improved. Because the heat generation of the explosion-proof fan motor is always within the normal range, there is no need to add a thermal protector for temperature protection, which avoids interrupting the continuity of the operation of the explosion-proof fan during thermal protection.

[0045] In one embodiment, a heat conductive pad 6 is further included between the main body of the fan motor 1 and the inner wall of the explosion-proof housing 5, wherein the heat conductive pad 6 is preferably an elastic heat conductive pad 6. This design can further improve the heat transfer efficiency and dissipate heat for the fan motor 1.

[0046] In one embodiment, the shaft sleeve 3 and the motor fixing cover 2 are interference fit, and the motor fixing cover 2 is provided with a positioning shoulder structure assembled with the shaft sleeve 3. If necessary, a small amount of thread glue can be placed between the shaft sleeve 3 and the motor fixing cover 2 for reinforcement. This design can better position and fix the shaft sleeve 3.

[0047] In one embodiment, the explosion-proof housing 5 is provided with a heat pipe mounting hole 51 and is provided with a heat pipe 7, one end of the heat pipe 7 is located in the heat pipe mounting hole 51, and the other end is in contact with a cold source (not shown in the figure). Furthermore, a thermal conductive paste can be provided between the mounting hole and the heat pipe 7, and the cold source can be an additional fan radiator. With this design, the heat dissipation effect of the explosion-proof housing 5 is further enhanced through the heat pipe 7.

[0048] Since the heat pipe 7 is a mature component that can be purchased on the market, its installation and working method are common knowledge to those skilled in the art, so it will not be described in detail here.

[0049] It should be noted that if the embodiments of the invention involve directional indications (such as up and down), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "multiple" means more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the invention.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A small explosion-proof fan assembly process, characterized in that: The invention comprises a fan motor (1), a motor fixing cover (2), a shaft sleeve (3), a fan blade (4) and an explosion-proof shell (5), wherein the shaft sleeve (3) is mounted on the motor fixing cover (2), the fan motor (1) is located in the explosion-proof shell (5), the rotating shaft of the fan motor (1) passes through the shaft sleeve (3) to the outside of the motor fixing cover (2) and is connected to the fan blade (4), and the motor fixing cover (2) is connected to the explosion-proof shell (5); the assembly process comprises: S1. Select a flexible sheet with uniform thickness: let the total flameproof gap of the flameproof fan be A, then the thickness of the flexible sheet is less than A*1 / 2; S2. Cutting the flexible sheet: Let the circumference of the shaft of the fan motor (1) be B, and the hole depth of the shaft sleeve (3) be D. Then the width of the flexible sheet is greater than B*1 / 2 and less than B, and the length of the flexible sheet is greater than D; S3, inserting the flexible sheet into the shaft sleeve (3): rolling the flexible sheet into a C-shaped cylinder and inserting it into the shaft sleeve (3); S4, inserting the rotating shaft: inserting the rotating shaft of the fan motor (1) into the shaft sleeve (3) with the flexible sheet; S5. Fix the fan motor (1): Use structural adhesive to stick the fan motor (1) to the motor fixing cover (2), and remove the flexible sheet after the structural adhesive is cured; S6. Installing the explosion-proof housing (5): placing the fan motor (1) into the explosion-proof housing (5) and connecting the motor fixing cover (2) and the explosion-proof housing (5) together.

2. The small explosion-proof fan assembly process according to claim 1 is characterized in that: In the step S3, when the flexible sheet is rolled into a C-shaped cylinder, the flexible sheet is wrapped around the rotating shaft of the fan motor (1) to form the C-shaped cylinder, and then the C-shaped cylinder-shaped flexible sheet is removed and inserted into the shaft sleeve (3).

3. A small explosion-proof fan, characterized in that: A small-sized explosion-proof fan assembled by the small-sized explosion-proof fan assembly process according to any one of claims 1 to 2, wherein the small-sized explosion-proof fan further comprises: A plurality of heat dissipation fins (52) are evenly distributed around the explosion-proof shell (5), and the airflow generated by the rotation of the fan blades (4) will flow through the gap between two adjacent heat dissipation fins (52).

4. The small explosion-proof fan according to claim 3, characterized in that: It also includes a heat-conducting pad (6) arranged between the main body of the fan motor (1) and the inner wall of the explosion-proof housing (5).

5. The small explosion-proof fan according to claim 3 or 4, characterized in that: The shaft sleeve (3) and the motor fixing cover (2) are in interference fit, and the motor fixing cover (2) is provided with a positioning shoulder structure assembled with the shaft sleeve (3).

6. The small explosion-proof fan according to claim 3 or 4, characterized in that: The explosion-proof shell (5) is provided with a heat pipe installation hole (51) and is provided with a heat pipe (7). One end of the heat pipe (7) is located in the heat pipe installation hole (51) and the other end is in contact with a cold source.

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