Power assembly for variable frequency generator

Abstract

The utility model relates to the technical field of generators, in particular to a power assembly for a variable frequency generator. The power assembly comprises a crankcase, a first wind scooper and a second wind scooper, the crankcase is connected with a cylinder head, and cooling fins are arranged on the outer side of the cylinder head. A first air channel penetrating through the front side and the rear side is formed in the middle of the cylinder head, and communicating air channels are formed in the left side and / or the right side of the cylinder head. The first wind scooper is provided with a first air inlet, and the second wind scooper is provided with a first exhaust port. Second air channels are defined by the second wind scooper and the left side and the right side of the cylinder head, and a wind shield is arranged in the second wind scooper. According to the scheme, during use, heat generated by the combustion chamber in the crankcase is mainly diffused from the middle of the cylinder head to the periphery, cooling air on the side face of the cylinder head is gathered into the first air channel from the second air channel through the communicating air channel through the air baffle, the cooling air flow in the first air channel is increased, and therefore the overall cooling effect of the cylinder head is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of generators, in particular to a power assembly for a variable frequency generator. Background Art

[0002] In the prior art, the power assembly of the variable frequency generator includes an integrated crankcase (the crankcase and the cylinder head 24 are integrated), a muffler, a recoil starter assembly, a first air duct and a second air duct. The cylinder head 24 is installed in the first air duct, and the muffler is installed in the second air duct. In order to improve the heat dissipation performance at the cylinder head 24, a number of heat sinks are arranged around the cylinder head at intervals, and a heat dissipation channel 25 is arranged in the middle of the cylinder head 24. (See Fig.10 ) With the above installation method, when the cooling air enters the first air guide cover from the air inlet and flows through the cylinder head 24, the cooling air is divided into three air flows, one of which enters the second air guide cover through the heat dissipation channel 25, and the other two air flows enter the second air guide cover from both sides of the cylinder head 24. After the three air flows enter the second air guide cover, they are finally discharged from the air outlet of the second air guide cover, thereby achieving the effect of cooling the cylinder head.

[0003] Although the existing variable frequency generator can ensure the working temperature by cooling the cylinder head 24, there are still some problems. Since the heat at the cylinder head 24 is mainly concentrated in the center, the cooling wind is dispersed into three wind flows when passing through the cylinder head 24, reducing the cooling wind passing through the heat dissipation channel 25 in the middle, thereby reducing the cooling effect on the cylinder head 24; secondly, since the cooling wind first passes through the cylinder head 24, the heat of the cylinder head 24 is transferred to the cooling wind, and then the heated cooling wind cools the muffler, and the cooling effect of the muffler is not good. Utility Model Content

[0004] The utility model aims to provide a power assembly for a variable frequency generator, aiming to solve the problem of poor cooling effect of the cylinder head of the existing variable frequency generator power assembly.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] 14. The engine as claimed in claim 13, wherein the cooling duct is provided on the outer side of the cylinder head and the cooling duct is provided on the outer side of the cylinder head. The cooling duct is provided on the outer side of the cylinder head and the cooling duct is provided on the inner side of the cylinder head. The first cooling duct and the second cooling duct are respectively installed on the front and rear sides of the crankcase, the first cooling duct is provided with a first air inlet, and the second cooling duct is provided with a first exhaust port. The cylinder head is located in the second cooling duct, and the second cooling duct is provided on the left and right sides of the cylinder head. The first cooling duct is communicated with the second cooling duct, and a connecting air duct connected with the first air duct is provided on the left and / or right sides of the cylinder head. The first air duct is communicated with the second air duct on the corresponding side through the connecting air duct. A wind shield is provided in the second air duct, and the wind shield is used to guide the cooling air in the second air duct into the connecting air duct on the corresponding side.

[0007] By adopting the above solution, when in use, the heat generated by the combustion chamber diffuses from the middle of the cylinder head to the surroundings, and the heat is mainly concentrated in the middle of the cylinder head. The cooling wind on the side of the cylinder head is fed into the first air duct from the second air duct through the connecting air duct under the action of the wind shield, increasing the cooling wind flow in the first air duct, thereby enhancing the cooling effect of the middle of the cylinder head. Although the cooling effect on the side of the cylinder head is reduced, the overall cooling effect of the cylinder head is improved.

[0008] The utility model is further configured such that the windshield and the second wind guide cover are integrally formed. The integrity of the windshield and the second wind guide cover is improved, and there is no need to assemble a windshield separately, which reduces the difficulty of assembly. The utility model is further configured such that the connection between the windshield and the second wind guide cover has a guide portion, the guide portion is arc-shaped, and the inner arc side of the guide portion is the windward side. Since the windward surface of the windshield is provided with an arc-shaped guide portion, the cooling air can flow more smoothly when entering the connecting air duct from the side of the cylinder head.

[0009] The utility model is further configured that a plurality of the connecting air ducts are spaced apart in the longitudinal direction of the cylinder head. By spaced apart in the longitudinal direction of the cylinder head, the ventilation volume is enhanced. Moreover, due to the spaced apart arrangement, the structural strength of the cylinder head can also be ensured.

[0010] The utility model is further configured such that the inner diameter of the air inlet end of the first air duct is larger than the inner diameter of the air outlet end. Since the inner diameter of the air inlet end of the first air duct is larger than the inner diameter of the air outlet end, the wind speed at the air outlet end is increased, thereby improving the cooling effect on other components at the air outlet end.

[0011] The utility model is further configured such that the inner diameter of the first air duct gradually shrinks from the air inlet end to the air outlet end. Since the inner diameter of the first air duct gradually shrinks, the air flow in the first air duct can pass smoothly.

[0012] The utility model is further configured such that a crankshaft is installed in the crankcase, and an impeller is connected to one end of the crankshaft, and the impeller is used to draw the gas outside the first air inlet into the first air duct. When the power assembly is working, the crankshaft will drive the impeller to draw the gas outside the first air inlet into the first air duct, so that the cooling air can flow quickly in the first air duct and the second air duct, thereby improving the cooling effect.

[0013] The utility model is further configured to include a recoil start assembly, the recoil start assembly includes a starter housing, the crankcase has a circle of enclosed flanges on the outside, a second air inlet is provided on the flange, the starter housing is fixedly connected to the flange, the starter housing, the flange and the crankcase together enclose an air intake chamber, the starter housing has a second exhaust port, the second exhaust port is connected to the second air guide cover, the other end of the crankshaft is connected to a fan, the fan is located in the air intake chamber, and the fan is used to draw gas outside the second air inlet into the air intake chamber. The fan draws external air into the air intake chamber from the second air inlet, and the air enters the second air guide cover from the second exhaust port, and the cooling air blows directly to the muffler, thereby enhancing the cooling effect on the muffler.

[0014] The utility model is further configured that a muffler is installed in the second air guide cover, and the muffler is located on the side where the first air duct outlets. Since the muffler is installed on the side where the first air duct outlets, the wind blown out from the outlet end of the first air duct can cool the muffler, thereby improving the utilization rate of the cooling wind.

[0015] The utility model is further configured such that a mesh cover is fixedly connected inside the first air inlet, so as to prevent the moving parts inside the first air guide cover from causing accidental injuries to the operator when the power assembly is working.

[0016] In summary, the power assembly for a variable frequency generator provided by the utility model has at least the following beneficial effects:

[0017] 1. The cooling effect on the middle part of the cylinder head is enhanced, thereby enhancing the cooling effect of the cylinder head as a whole.

[0018] 2. Enhanced the cooling effect of the muffler. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any novel labor.

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment;

[0021] Figure 2 is an exploded view of an embodiment;

[0022] Figure 3 is a rear view of the embodiment;

[0023] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0024] Figure 5 is a top view of an embodiment;

[0025] Figure 6 yes Figure 5 Sectional view at the middle BB;

[0026] Figure 7 yes Figure 5 Sectional view at CC;

[0027] Figure 8 is a left side view of the embodiment;

[0028] Fig. 9 is a three-dimensional structural diagram of the first cover body in the embodiment;

[0029] Fig.10 It is a schematic diagram of wind flow distribution at a cylinder head of a powertrain in the prior art in the background technology.

[0030] In the figure: crankcase 1, first air guide cover 2, second air guide cover 3, first cover body 301, second cover body 302, cylinder head 4, heat sink 5, first air duct 6, second air duct 7, first air inlet 8, first exhaust port 9, connecting air duct 10, wind shield 11, crankshaft 12, impeller 13, air guide part 14, muffler 15, mesh cover 16, starter housing 17, flange 18, second air inlet 19, second exhaust port 20, fan 21, carburetor 22, air filter 23, cylinder head 24, heat dissipation channel 25. DETAILED DESCRIPTION

[0031] In order to make those skilled in the art better understand the technical solution of the utility model, the following Figure 1-10 The utility model is further described in detail with specific implementation methods.

[0032] See also Figure 1-10, a power assembly for a variable frequency generator provided in this embodiment includes a crankcase 1, a muffler 15, a recoil start assembly, a first air guide cover 2 and a second air guide cover 3. The existing power assembly also includes a carburetor 22 and an air filter 23 fixedly connected to the outside of the crankcase 1. In this embodiment, the carburetor 22 and the air filter 23 are fixedly installed on the left side of the first air guide cover 2. The top of the crankcase 1 is connected to a cylinder head 4, and the crankcase 1 is a crankcase with an integrated crankcase and a cylinder head in the prior art. A heat sink 5 is provided on the outside of the cylinder head 4, and a first air duct 6 is opened in the middle of the cylinder head 4 to pass through the front and rear sides. The front end of the first air duct 6 is an air inlet end, and the rear end is an air outlet end. A connecting air duct 10 is opened on the left or right side of the cylinder head 4, and the connecting air duct 10 can also be opened on both the left and right sides. In this embodiment, it is preferred to open a connecting air duct 10 on the left side of the cylinder head 4, and the connecting air duct 10 is connected to the first air duct 6. The first air duct 2 is fixedly mounted on the front side of the crankcase 1, and the second air duct 3 is fixedly mounted on the rear side of the crankcase 1. A first air inlet 8 is provided on the front side of the first air duct 2, and a first air outlet 9 is provided on the rear side of the second air duct 3. The cylinder head 4 is located in the second air duct 3, and the first air duct 2 is connected to the second air duct 3. The second air duct 3 and the left and right sides of the cylinder head 4 are both surrounded by a second air duct 7, and the connecting air duct 10 located on the left side of the cylinder head 4 is connected to the second air duct 7 on the left side of the cylinder head 4, so that the second air duct 7 on the left side of the cylinder head 4 forms a passage with the connecting air duct 10 on the corresponding side and the first air duct 6. When the cooling air in the first air duct 2 flows into the second air duct 3, the cooling air flows through the cylinder head 4, exchanges heat with the cylinder head 4, and thus cools the cylinder head 4. A windshield 11 is provided in the second air duct 7. In this embodiment, the windshield 11 is preferably arranged on the left side of the cylinder head 4, and the windshield 11 is integrally formed with the second air duct 3. The windshield 11 is used to guide the cooling air on the outside of the cylinder head 4 into the connecting air duct 10 on the corresponding side. The connection between the windshield 11 and the second air guide cover 3 has an air guide portion 14, and the air guide portion 14 is arc-shaped, and the inner arc side of the air guide portion 14 is the windward side. In order to increase the ventilation volume, a number of connecting air ducts 10 are spaced apart along the longitudinal direction of the cylinder head 4, and the air outlet ends of the several connecting air ducts 10 are connected to the first air duct 6. The inner diameter of the air inlet end of the first air duct 6 is larger than the inner diameter of the air outlet end, and the inner diameter of the first air duct 6 gradually shrinks from the air inlet end to the air outlet end. The second air guide cover 3 includes a first cover body 301 and a second cover body 302, and the first cover body 301 and the second cover body 302 are assembled together to form a complete second air guide cover 3, and the first cover body 301 and the second cover body 302 are detachably connected. The first cover 301 is located on the left side of the crankcase 1, the second cover 302 is located on the right side of the crankcase 1, and the windshield 11 is integrally formed with the first cover 301. The first cover 301 is an intake air guide cover of the crankcase 1, and the second cover 302 is an exhaust air guide cover of the crankcase 1. The air guide portion 14 is located at the connection between the windshield 11 and the first cover 301.A muffler 15 is installed in the second air duct 3, and the muffler 15 is located on the side of the first air duct 6 where air is discharged, and the muffler 15 is located on the rear side of the cylinder head 4. In order to prevent the operator from accidentally inserting his hand into the first air inlet 8, thereby preventing the operator from being injured by the moving parts of the power assembly in the first air duct 2, a mesh cover 16 is fixedly connected to the first air inlet 8.

[0033] By adopting the above solution, when in use, the cooling air enters from the first air inlet 8, flows through the first air guide cover 2 and the second air guide cover 3 in sequence, and finally is discharged from the first exhaust port 9. When the cooling air flows through the cylinder head 4, the airflow is first divided into three airflows. The airflow on the right side of the cylinder head 4 flows through the right side of the cylinder head 4, and the airflow on the left side of the cylinder head 4 enters the first air duct 6 from the connecting air duct 10 on the side of the cylinder head 4 under the guidance of the wind shield 11, which increases the flow rate of the cooling air in the middle of the cylinder head 4, thereby enhancing the cooling effect on the middle of the cylinder head 4.

[0034] In order to enhance the cooling effect, the front end of the crankshaft 12 is connected to an impeller 13, which is fixedly connected to the crankshaft 12 and is used to draw the gas outside the first air inlet 8 into the first air guide 2. A recoil start assembly is also included, and the recoil start assembly includes a starter housing 17. The rear side of the crankcase 1 has a flange 18 that surrounds a circle, and a second air inlet 19 is opened on the flange 18. The starter housing 17 is fixedly connected to the flange 18, and the starter housing 17, the flange 18 and the crankcase 1 together form an air intake chamber. The starter housing 17 is provided with a second exhaust port 20, and the second exhaust port 20 is connected to the second air guide 3. The rear end of the crankshaft 12 is connected to a fan 21, which is located in the air intake chamber, and the fan 21 is used to draw the gas outside the second air inlet 19 into the air intake chamber. When in use, the impeller 13 draws air outside the first air inlet 8 into the first air guide 2 to form a fast-flowing cooling airflow, thereby enhancing the overall cooling effect. The fan 21 draws air from the outside into the air inlet chamber to form a cooling airflow, which is discharged from the second exhaust port 20 and blown toward the muffler 15, thereby enhancing the cooling effect on the muffler 15.

[0035] It should be noted that the words indicating direction in this article, such as up and down, are all based on Figure 1 The setting of the direction is only for the convenience of description and has no other specific meaning.

[0036] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0037] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A power assembly for a variable frequency generator, characterized in that: The invention comprises a crankcase (1), a first air guide cover (2) and a second air guide cover (3), wherein the crankcase (1) is connected to a cylinder head (4), a heat sink (5) is arranged on the outer side of the cylinder head (4), a first air duct (6) penetrating the front and rear sides is arranged in the middle of the cylinder head (4), the first air guide cover (2) and the second air guide cover (3) are respectively installed on the front and rear sides of the crankcase (1), a first air inlet (8) is arranged on the first air guide cover (2), a first air outlet (9) is arranged on the second air guide cover (3), the cylinder head (4) is located in the second air guide cover (3), and the cylinder head (4) is located in the second air guide cover (3). The second air duct (7) is enclosed by the second air duct (3) and the left and right sides of the cylinder head (4); the first air duct (2) is connected to the second air duct (3); a connecting air duct (10) connected to the first air duct (6) is provided on the left and / or right side of the cylinder head (4); the first air duct (6) is connected to the second air duct (7) on the corresponding side through the connecting air duct (10); a wind shield (11) is provided in the second air duct (7); the wind shield (11) is used to guide the cooling air in the second air duct (7) into the connecting air duct (10) on the corresponding side.

2. A power assembly for a variable frequency generator as claimed in claim 1, characterized in that: The wind shield (11) and the second wind guide cover (3) are integrally formed.

3. A power assembly for a variable frequency generator as claimed in claim 1, characterized in that: A guide portion (14) is provided at the connection between the wind deflector plate (11) and the second wind guide cover (3); the guide portion (14) is arc-shaped, and the inner arc side of the guide portion (14) is the windward side.

4. A power assembly for a variable frequency generator as claimed in any one of claims 1 to 3, characterized in that: A plurality of the connecting air ducts (10) are spaced apart along the longitudinal direction of the cylinder head (4).

5. A power assembly for a variable frequency generator as claimed in claim 4, characterized in that: The inner diameter of the air inlet end of the first air duct (6) is greater than the inner diameter of the air outlet end.

6. A power assembly for a variable frequency generator as claimed in claim 5, characterized in that: The inner diameter of the first air duct (6) gradually shrinks from the air inlet end to the air outlet end.

7. A power assembly for a variable frequency generator as claimed in claim 1, characterized in that: A crankshaft (12) is installed in the crankcase (1), one end of the crankshaft (12) is connected to an impeller (13), and the impeller (13) is used to draw gas outside the first air inlet (8) into the first air guide cover (2).

8. A power assembly for a variable frequency generator as claimed in claim 7, characterized in that: The invention also comprises a recoil starting assembly, wherein the recoil starting assembly comprises a starter housing (17), the crankcase (1) has a flange (18) on the outside thereof, a second air inlet (19) is provided on the flange (18), the starter housing (17) is fixedly connected to the flange (18), the starter housing (17) and the flange (18) and the crankcase (1) together form an air inlet chamber, the starter housing (17) has a second air outlet (20), the second air outlet (20) is connected to the second air guide cover (3), the other end of the crankshaft (12) is connected to a fan (21), the fan (21) is located in the air inlet chamber, and the fan (21) is used to draw gas outside the second air inlet (19) into the air inlet chamber.

9. A power assembly for a variable frequency generator as claimed in claim 1, characterized in that: A muffler (15) is installed in the second air guide cover (3), and the muffler (15) is located on the side where the first air duct (6) exits the air.

10. A power assembly for a variable frequency generator as claimed in any one of claims 5 to 9, characterized in that: A mesh cover (16) is fixedly connected inside the first air inlet (8).

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