Airflow ring in hand wheel structure of electric control sewing machine and hand wheel structure

Abstract

The utility model relates to an airflow ring in an electric control sewing machine hand wheel structure and the hand wheel structure, the airflow ring is provided with a cylindrical body, the two axial sides of the body are an inlet side and an outlet side which are opposite, the two ends of the body expand outwards, a pressurizing section is formed on the inlet side, and a flow guide section is formed on the outlet side. The inner walls of the pressurizing section and the flow guide section are in smooth transition and intersect at the waist portion with the smallest inner diameter, in the working process, the airflow ring is used for pressurizing and guiding airflow, specifically, the pressurizing section increases the airflow pressure to increase the exhaust distance, the shape of the pressurizing section is expanded outwards so that the air inlet amount can be increased, and the flow guide section reduces the axial resistance of the airflow at a better air outlet angle; therefore, a better heat dissipation effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of sewing equipment, and particularly to an air flow ring and a handwheel structure in an electronically controlled sewing machine handwheel structure. Background Art

[0002] Currently, the types of handwheels of electronically controlled integrated sewing machines are mainly divided into axial flow type and centrifugal type. The blades of the axial flow type are parallel to the rotating shaft in space, and the air flow enters axially and exits axially. This kind of handwheel has the characteristics of large air volume and small pressure, and is usually used in daily scenarios such as hanging fans, floor fans, and kitchen exhaust fans. The wind pressure formed by this kind of fan is small. When encountering axial resistance, the air volume will be greatly reduced, hindering the flow of air, and the flow distance of the air flow is short, resulting in limited heat dissipation.

[0003] For example, the handwheel disclosed in the prior art includes a handwheel body with fan blades and a handwheel cover. When the handwheel is driven by a motor to rotate, the differential pressure generated by the rotation of the handwheel body is used to exhaust and dissipate heat from the sewing machine. The size and pressure of the air flow completely depend on the arrangement of the fan blades, and this handwheel body is obviously of the axial flow type, and the effect of increasing the pressure of the air flow is not good.

[0004] For the centrifugal structure, the directions of the air flow at the inlet and outlet are perpendicular to each other. Compared with the axial flow type, although it can significantly increase the pressure of the air flow and is suitable for long-distance exhaust, the ventilation efficiency is lower, the air volume is smaller, and the noise is greater. Therefore, it is necessary to further optimize the heat dissipation of this type of sewing machine. Utility Model Content

[0005] The present application provides an air flow ring for an electronically controlled sewing machine handwheel structure, which can further improve the heat dissipation effect when applied to the handwheel structure.

[0006] The present application provides an air flow ring in an electronically controlled sewing machine handwheel structure. The air flow ring has a cylindrical body. The two axial sides of the body are opposite inlet side and outlet side. Both ends of the body expand outward in shape, and a pressurizing section is formed on the inlet side, and a guiding section is formed on the outlet side. The inner walls of the pressurizing section and the guiding section are smoothly transitioned and meet at the waist with the smallest inner diameter.

[0007] The following also provides several optional ways, but they are not additional limitations to the above overall solution, but only further supplements or optimizations. Without technical or logical contradictions, each optional way can be combined with the above overall solution alone, or multiple optional ways can be combined with each other.

[0008] In one embodiment, the inlet side has an inner diameter D1, the waist has an inner diameter D2, and the outlet side has an inner diameter D3, and the following is satisfied:

[0009] D1:D2:D3 = (1.4 - 1.8):1:(2.1 - 2.5).

[0010] In one embodiment, D1:D2:D3 = (1.5 - 1.7):1:(2.3 - 2.4).

[0011] In one embodiment, along the axial direction of the body, the pressurizing section has a length L1, the guiding section has a length L2, and L1:L2 = (1.1 - 1.4):1 is satisfied.

[0012] In one embodiment, L1:L2 = (1.2 - 1.3):1.

[0013] In one embodiment, the guiding section has a faster outward expansion trend relative to the pressurizing section.

[0014] In one embodiment, the inner wall of the body is a rotating surface, and the generatrix of the rotating surface is a smooth curve.

[0015] In one embodiment, the angle between the generatrix and the axis of the body at the part adjacent to the outlet side is 60 degrees to 75 degrees.

[0016] In one embodiment, the outer wall of the guiding section is provided with a fitting structure for the connector towards the inlet side; a connector avoidance opening is formed at the edge part of the pressurizing section at the inlet side.

[0017] This application also provides a handwheel structure, including:

[0018] An air flow ring, adopting the air flow ring in the handwheel structure of the electric control sewing machine of this application, wherein a positioning groove is provided on the inner wall of the flared section;

[0019] An impeller, including a base plate and blades, the base plate and the guiding section are arranged at intervals along the axial direction and an air flow distribution area is between them, the blades are located in the air flow distribution area and are circumferentially spaced apart, and both side edges of the blades in the axial direction are respectively fixed to the base plate and the corresponding positioning groove, and the air flow enters the air flow ring axially and then diverges radially outward after passing through the air flow distribution area.

[0020] The air flow ring in the handwheel structure of the electric control sewing machine of this application, when installed on the handwheel structure and working, pressurizes and guides the air flow by the air flow ring. Specifically, the pressurizing section increases the air flow pressure to increase the exhaust distance, and the shape expands outward to increase the air intake volume, and the guiding section reduces the axial resistance of the air flow at a better air outlet angle, thereby producing a better heat dissipation effect. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Structural view of a sewing machine according to an embodiment of the present application;

[0023] Figure 2 For Figure 1 Structural view of a part of the sewing machine housing after disassembly;

[0024] Figure 3 Exploded view of the motor, handwheel structure, radiator and heat dissipation oil pan in a sewing machine according to an embodiment of the present application;

[0025] Figure 4 For Figure 2 Partial view at the handwheel structure in ;

[0026] Figure 5 Structural schematic diagram of a handwheel structure according to an embodiment of the present application;

[0027] Figure 6 For Figure 5 Exploded view of the handwheel structure in ;

[0028] Figure 7 For Figure 6 Exploded view of the handwheel structure in another perspective;

[0029] Figure 8 For Figure 5 Front view of the handwheel structure in ;

[0030] Figure 9 For Figure 8 Cross-sectional view of the handwheel structure in the A-A direction in ;

[0031] Figure 10 For Figure 9 Cross-sectional view of the air flow ring in.

[0032] The reference numerals of each component are as follows:

[0033] 1000, handwheel structure; 100, air flow ring; 101, air flow channel; 111, inlet side; 112, outlet side; 113, pressurizing section; 114, guiding section; 115, waist; 116, first boss; 117, avoidance opening; 118, positioning groove; 119, generatrix; 1191, first section; 1192, second section;

[0034] 120. Airflow distribution area; 130. Fastener;

[0035] 140. Outer cover; 141. Panel; 142. Enclosure; 143. Air inlet; 144. Counterbore; 146. Second boss;

[0036] 150. Impeller; 160. Base plate; 170. Blade; 180. Bushing;

[0037] 2000. Sewing machine; 200. Machine housing; 201. Air outlet; 210. Motor; 211. Main shaft; 220. Radiator; 230. Heat dissipation oil pan. Detailed implementation manners

[0038] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0039] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0041] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or it only means that the first feature is at a higher horizontal level (or in a certain usage state, or from a certain perspective of an attached drawing) than the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or it only means that the first feature is at a lower horizontal level (or in a certain usage state, or from a certain perspective of an attached drawing) than the second feature.

[0042] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0043] Refer to Figures 1 to 10 , an embodiment of this application provides an air flow ring 100 in the handwheel structure of an electric sewing machine. The sewing machine 2000 to which it is applied includes a motor 210, a main shaft 211 connected to the motor 210, and a handwheel structure 1000 connected to the main shaft 211. When the sewing machine 2000 operates, the motor 210 starts and drives the main shaft 211 to rotate, and the handwheel structure 1000 rotates synchronously and generates a pressure difference to generate an air flow. The main shaft 211 has an axis. In the following embodiments, unless otherwise specifically stated, the axial direction, radial direction, and circumferential direction are all based on the main shaft 211.

[0044] The air flow ring 100 of this embodiment has a cylindrical body. The two axial sides of the body are the opposite inlet side 111 and outlet side 112. For the understanding of the cylindrical shape, the inner side of the body has an air flow channel 101 through which the air flow passes. The outer contour extends axially and the radial dimensions are the same or similar, such as the shape shown in the figure.

[0045] Specifically, both axial ends of the main body expand outward compared to its middle part or the vicinity of the middle part, forming a pressurizing section 113 on the side of the inlet side 111 and a flow guiding section 114 on the side of the outlet side 112. The inner walls of the pressurizing section 113 and the flow guiding section 114 are smoothly transitioned and meet at the waist 115 with the smallest inner diameter. When the sewing machine 2000 is working, the handwheel structure 1000 rotates, driving the air flow to enter from the inlet side 111. Before the air flow reaches the waist 115, due to the gradually shrinking radial dimension of the pressurizing section 113, the air flow is compressed when passing through to increase the pressure. After passing through the waist 115, it is flow-guided by the flow guiding section 114 at a better angle. Compared with the traditional axial flow type, the air flow ring 100 of the present application pressurizes the air flow at the pressurizing section 113, and the shape of the pressurizing section 113 expands outward to increase the gas intake amount, thereby increasing the gas flow rate.

[0046] Compared with the centrifugal structure, the flow guiding section 114 is not perpendicular to the axis in the traditional way, reducing the axial resistance to the air flow. Moreover, the smooth transition of the inner wall of the air flow ring 100 can further reduce the resistance when the air flow passes through. While reducing the axial resistance of the air flow, the pressure of the air flow is increased, enabling long-distance exhaust and having a large air output, thereby improving the heat dissipation effect.

[0047] The inclination directions of the pressurizing section 113 and the flow guiding section 114 are opposite and both are away from the waist 115. The air flow ring is a rotating surface, and the generatrix 119 ( Figure 10 the bold line in it) is a smooth curve to minimize the air flow resistance as much as possible. Correspondingly, the generatrix 119 is divided into a first section 1191 located on the inlet side 111 and a second section 1192 located on the outlet side 112. The angle between the tangent of the first section 1191 and the axis of the main body is α1, and the angle between the tangent of the second section 1192 and the axis of the main body is α2. Among them, the flow guiding section 114 has a faster outward expansion trend relative to the pressurizing section 113, that is, α2 is greater than α1.

[0048] Preferably, α1 satisfies 40 degrees to 55 degrees, for example, α1 = 45 degrees; α2 satisfies 65 degrees to 75 degrees, for example, α2 satisfies 70 degrees to 72 degrees, and preferably α2 = 71 degrees.

[0049] The air flow ring has an inner diameter D1 on the inlet side 111, an inner diameter D2 at the waist 115, and an inner diameter D3 on the outlet side 112, and the three satisfy D1:D2:D3 = (1.4 to 1.8):1:(2.1 to 2.5). Preferably, D1:D2:D3 = (1.5 to 1.7):1:(2.3 to 2.4), and further preferably D1:D2:D3 = 1.6:1:2.4. Along the axis, the pressurizing section 113 has a length L1, and the flow guiding section 114 has a length L2 and satisfies L1:L2 = (1.1 to 1.4):1. Preferably, L1:L2 = (1.2 to 1.3):1.

[0050] On the outer wall of the diversion section 114 of the main body, there is a connecting piece adaptation structure facing the inlet side 111. The connecting piece includes, but is not limited to, the outer cover 140 shown in the figure. The connecting piece adaptation structure is the first boss 116 provided on the outer wall of the diversion section 114. The first boss 116 is provided with an internal thread. The outer cover 140 is provided with a second boss 146 that docks with the first boss 116, and the two are connected by a fastener 130 (such as a bolt) to connect the first boss 116 and the second boss 146. Combining with the figure, the outer cover 140 includes a panel 141 and a fence 142. The panel 141 is provided with an air inlet hole 143, and the air inlet hole 143 corresponds to the position of the inlet side 111. The hole size of the air inlet hole 143 can prevent large particles from entering and blocking the air flow channel 101 and / or the following air flow distribution area 120.

[0051] The fence 142 extends from the edge of the panel 141 and surrounds the outer periphery of the main body. The panel 141 and the fence 142 of the outer cover 140 respectively abut against the outer edge surface of the pressurization section 113 to prevent the air flow from being diverted.

[0052] Correspondingly, the pressurization section 113 is provided with a connecting piece avoidance opening 117 at the edge part of the inlet side 111. Combining with the foregoing, the connecting piece avoidance opening 117 is used to avoid the second boss 146 for convenient assembly.

[0053] An embodiment of the present application further provides a handwheel structure. The handwheel structure 1000 includes an air flow ring 100 and an impeller 150. The air flow ring 100 can be combined with the above embodiments, and a positioning groove 118 is provided on the inner wall of the diversion section 114 of the air flow ring 100. The impeller 150 includes a base plate 160 and blades 170. The base plate 160 and the diversion section 114 are arranged at an axial interval, and an air flow distribution area 120 is formed therebetween. The blades 170 are located in the air flow distribution area 120 and are multiple. The blades 170 are circumferentially spaced apart. The two side edges of the blades 170 in the axial direction are respectively fixed to the base plate 160 and the corresponding positioning groove 118. The specific path of the air flow refers to the dotted arrow in the figure: entering the air flow channel 101 axially along the inlet side 111, and then radially diverging and outputting after passing through the air flow distribution area 120. The main shaft 211 passes through the base plate 160 and is connected to the outer cover 140. A bushing 180 is provided between the main shaft 211 and the base plate 160, and the three are fixed by pins to achieve synchronous rotation. The outer cover 140 is provided with a counterbore 144. After the main shaft 211 extends into the base plate 160 and abuts against the counterbore 144, it is then connected to the end of the main shaft 211 by a fastener 130 (such as a bolt) passing through the counterbore 144. The blades 170 are embedded in the positioning groove 118 to realize the relative fixation of the air flow ring 100 and the impeller 150. Among them, the air flow distribution area 120 extends with equal width along the air flow direction to avoid the decrease of the air flow pressure.

[0054] When the handwheel structure 1000 of the present application is applied to a sewing machine 2000, the relevant parts in the sewing machine 2000 further include a radiator 220 arranged on the outer periphery of the handwheel structure 1000, and the outlet side 112 of the impeller 150 faces the radiator 220. The radiator 220 is an aluminum plate and is connected to the housing 200 of the sewing machine. The radiator 220 absorbs the heat from the housing 200, and the airflow takes away the heat of the radiator 220, thereby achieving the effect of dissipating heat from the housing 200. Further, the housing 200 has a chamber for accommodating the motor 210 and part of the handwheel structure 1000. The radiator 220 is arranged in the chamber, and the airflow is guided by the chamber wall or the radiator 220 to circulate in the chamber along a certain route, so as to fully cool the housing 200. The housing 200 is provided with an air outlet 201 communicating with the chamber, and the airflow finally discharges from the air outlet 201.

[0055] The sewing machine 2000 includes a heat dissipation oil pan 230 arranged at the bottom of the housing 200. The air outlet 201 is opened at the bottom of the housing 200. At least one surface of the heat dissipation oil pan 230 is arranged adjacent to the air outlet 201. The airflow discharges through the air outlet 201 and passes through the surface of the heat dissipation oil pan 230 to take away its heat.

[0056] After the airflow ring of the present application is installed on the handwheel structure, during operation, the airflow ring pressurizes and guides the airflow. Specifically, the pressurizing section increases the airflow velocity to increase the exhaust distance, and the guiding section can reduce the axial resistance to the airflow and at the same time with a better air outlet angle, so that the airflow flows through the corresponding components of the sewing machine at a higher velocity and a larger air volume, providing a better heat dissipation effect.

[0057] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification. When the technical features in different embodiments are shown in the same drawing, it can be regarded that the drawing also discloses the combination examples of the respective embodiments involved at the same time.

[0058] The above-described embodiments only express several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An airflow ring in a handwheel structure of an electric-controlled sewing machine, characterized in that: The airflow ring has a cylindrical body, and the two axial sides of the body are opposite inlet side and outlet side. Both ends of the body are outwardly expanded, and a boost section is formed on the inlet side, and a guide section is formed on the outlet side. The inner walls of the boost section and the guide section are smoothly transitioned and converge at the waist with the smallest inner diameter.

2. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 1, characterized in that: The inlet side has an inner diameter D1, the waist has an inner diameter D2, the outlet side has an inner diameter D3, and satisfies: D1:D2:D3=(1.4~1.8):1: (2.1~2.5).

3. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 2, characterized in that: D1： D2: D3=(1.5~1.7):1: (2.3~2.4).

4. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 2, characterized in that: Along the axial direction of the main body, the boost section has a length L1, the guide section has a length L2, and they satisfy L1:L2=(1.1-1.4):

1.

5. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 4, characterized in that: L1:L2=(1.2~1.3):

1.

6. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 1, characterized in that: The guide section has a faster outward expansion trend than the boost section.

7. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 1, characterized in that: The inner wall of the body is a rotation surface, and the generatrix of the rotation surface is a smooth curve.

8. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 7, characterized in that: The included angle between the busbar at a position adjacent to the outlet side and the axis of the main body is 60 degrees to 75 degrees.

9. The airflow ring in the handwheel structure of an electric-controlled sewing machine according to claim 1, characterized in that: The outer wall of the guide section is provided with a connector adapting structure facing the inlet side; and the boost section is provided with a connector avoidance opening at the edge portion of the inlet side.

10. A hand wheel structure, characterized in that: include: An airflow ring, which adopts the airflow ring in the electric-controlled sewing machine handwheel structure as claimed in any one of claims 1 to 9, wherein the inner wall of the guide section is provided with a positioning groove; An impeller comprises a base plate and blades, wherein the base plate and the guide section are arranged at intervals along the axial direction and an airflow distribution area is formed between the base plate and the guide section. The blades are located in the airflow distribution area and are distributed at intervals along the circumferential direction. The two axial side edges of the blades are respectively fixed to the base plate and the corresponding positioning grooves. The airflow enters the airflow ring along the axial direction and is radially divergent and outputted outward after passing through the airflow distribution area.

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