Anti-overheating gear pump applied to hydraulic oil circuit

Abstract

The invention relates to the technical field of gear pumps, in particular to an anti-overheating gear pump applied to a hydraulic oil way, the anti-overheating gear pump comprises a pump body assembly, an inner circulation heat dissipation assembly and an outer heat dissipation assembly, the pump body assembly comprises a shell formed by assembling a pump shell and a pump cover, and a main shaft is rotationally connected to the lower portion of the interior of the shell; a main gear is installed in the middle of the exterior of the main shaft, a first sealing cover is arranged in the middle of one end of the main gear, an auxiliary shaft is rotationally connected to the upper portion of the interior of the shell, an auxiliary gear is installed in the middle of the exterior of the auxiliary shaft, a second sealing cover is arranged in the middle of one end of the auxiliary gear, and the auxiliary gear and the main gear are connected in a meshed mode. According to the invention, the magnetic coupling transmission structure is driven by the rotating countershaft, so that the cooling liquid in circulating flow is cooled by air. Through shaftless paddle structures in the driving shafts of the main shaft and the auxiliary shaft, cooling liquid circulation is prevented from being overheated in a square-shaped loop, and the device is more suitable for engineering mechanical equipment in a high-temperature hydraulic working environment.

Description

Technical Field

[0001] The present invention relates to the technical field of gear pumps, and specifically to an anti-overheating gear pump applied to a hydraulic oil circuit. Background Art

[0002] A gear pump is a rotary pump in which two meshing gears are closely fitted together and rotate meshingly with each other inside a housing to form a change in working volume and movement to transport or pressurize a liquid. When the gears rotate, the volume of the space on the side where the gears disengage increases from small to large, forming a vacuum to suck in the liquid, and the volume of the space on the side where the gears mesh decreases from large to small, thereby squeezing the hydraulic oil together to achieve pumping.

[0003] For existing gear pumps, their heat dissipation methods mostly rely on direct air cooling through the outside of the housing or additional installation of a jacket for liquid cooling. However, for engineering machinery and equipment, such as excavator equipment, the operating temperature of its hydraulic system is usually around 50 to 80 degrees Celsius. The high-temperature hydraulic oil will cause the gears inside the gear pump to quickly heat up and always be in a high-temperature environment. At this time, relying solely on the existing heat dissipation methods outside the housing has low efficiency. Moreover, the heated gears will undergo subtle structural changes. If the heat dissipation inside the pump is not carried out in time, it will lead to wear on the gear tooth surfaces, thereby greatly reducing the life of the pump. Therefore, the heat dissipation of the internal gears is of utmost importance. For this reason, this solution envisions an internal liquid cooling circuit for the gear pump to prevent the gear pump from overheating and ensure its use. Summary of the Invention

[0004] The present invention provides an anti-overheating gear pump applied to a hydraulic oil circuit to solve the above problems.

[0005] To achieve the above object, the present invention provides the following technical solutions: An anti-overheating gear pump applied to a hydraulic oil circuit includes a pump body assembly, an internal circulation heat dissipation assembly, and an external heat dissipation assembly. The pump body assembly includes a housing assembled by a pump housing and a pump cover. A main shaft is rotatably connected to the lower part inside the housing. A main gear is installed in the middle of the outside of the main shaft. A first seal cover is arranged in the middle of one end of the main gear. A secondary shaft is rotatably connected to the upper part inside the housing. A secondary gear is installed in the middle of the outside of the secondary shaft. A second seal cover is arranged in the middle of one end of the secondary gear. The secondary gear is meshingly connected with the main gear; The internal circulation heat dissipation assembly includes a first channel that runs through the main shaft axially and a second channel that runs through the secondary shaft axially. The first channel and the second channel are connected end to end outside the housing to form a square-shaped loop. Shaftless paddle structures are arranged inside both the first channel and the second channel to drive the coolant to circulate in the above loop when the main shaft and the secondary shaft rotate; The external heat dissipation component is arranged on one side of the pump body component and is driven by the rotating secondary shaft through the magnetic coupling transmission structure to cool the coolant flowing in the air-cooled cycle. The first channel includes a first shaft cavity arranged inside one end of the main shaft and a second shaft cavity arranged inside the other end of the main shaft. A first shaftless paddle is installed inside the first shaft cavity. One side in the middle of the main shaft is provided with a first through hole communicating with the first shaft cavity, and the other side in the middle of the main shaft is provided with a second through hole communicating with the second shaft cavity. Both the first through hole and the second through hole are located in the inner cavity of the main gear. The other end of the main shaft is provided with a third through hole communicating with the second shaft cavity. The second channel includes a third shaft cavity arranged inside one end of the secondary shaft and a fourth shaft cavity arranged inside the other end of the secondary shaft. A second shaftless paddle is installed inside the fourth shaft cavity. One side in the middle of the secondary shaft is provided with a fourth through hole communicating with the third shaft cavity, and the other side in the middle of the secondary shaft is provided with a fifth through hole communicating with the fourth shaft cavity. Both the fourth through hole and the fifth through hole are located in the inner cavity of the secondary gear. The internal circulation heat dissipation component further includes a first adapter installed in the middle of one side of the pump cover and a second adapter installed in the middle of one side of the pump housing. The first adapter includes a first upper cover bowl rotatably connected to the outside of one end of the secondary shaft and a lower cover bowl rotatably connected to the outside of one end of the main shaft. The first upper cover bowl and the lower cover bowl are connected and communicated through a coiled pipe. The second adapter includes a second upper cover bowl rotatably connected to the outside of the other end of the secondary shaft and a cover ring rotatably connected to the outside of the other end of the main shaft. The second upper cover bowl and the cover ring are connected and communicated through a pipe.

[0006] As a preferred solution of the present invention, the internal circulation heat dissipation component further includes a first flow guiding cone installed outside the main shaft between the first through hole and the second through hole.

[0007] As a preferred solution of the present invention, the internal circulation heat dissipation component further includes a second flow guiding cone installed outside the secondary shaft between the fourth through hole and the fifth through hole.

[0008] As a preferred solution of the present invention, the external heat dissipation component includes a fan blade. The fan blade is rotatably connected to the middle of one side of the first upper cover bowl. The magnetic coupling transmission structure includes a first magnet block and a second magnet block. The first magnet block is installed at one end of the fan blade shaft, and the second magnet block is installed inside the orifice of the third shaft cavity.

[0009] As a preferred solution of the present invention, connection pipe heads for the inlet and outlet of hydraulic oil are respectively arranged in the middle of both ends of the pump housing.

[0010] As a preferred solution of the present invention, heat dissipation fins are arranged on the outside of the pump housing.

[0011] As a preferred solution of the present invention, a transmission shaft is installed inside the cavity opening of the second shaft cavity.

[0012] As a preferred solution of the present invention, the first sealing cover is spline-matched with the main shaft and the main gear, and the second sealing cover is spline-matched with the secondary shaft and the secondary gear.

[0013] In the scheme of the present invention, a first channel is passed through the main shaft along the axial direction, and a second channel is passed through the auxiliary shaft along the axial direction. The first channel and the second channel are connected end to end on the outside of the shell to form a U-shaped loop. When the coolant in the above loop circulates, it can fully contact the inside of the shaft and gear structure, thereby taking away the heat released by the high-temperature hydraulic oil absorbed by the structure, effectively preventing the gear pump from overheating, and avoiding the existing direct air cooling or installing a jacket for liquid cooling, which cannot effectively dissipate the heat inside the gear pump, thereby causing wear on the gear tooth surface and greatly reducing the service life.

[0014] The present invention sets a first shaft cavity inside one end of the main shaft and a second shaft cavity inside the other end of the main shaft, and a first shaftless paddle is installed inside the first shaft cavity. Similarly, a third shaft cavity is set inside one end of the secondary shaft and a fourth shaft cavity is set inside the other end of the secondary shaft, and a second shaftless paddle is installed inside the fourth shaft cavity. The coolant inside the shaft cavity can be driven to flow by the rotation of the main shaft and the secondary shaft. This design has a high degree of fit with the design of setting a liquid cooling cavity inside the pump structure, thereby ensuring the feasibility of the implementation of this solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 for Figure 1 Another perspective diagram of the structure; Figure 3 It is an exploded schematic diagram of the pump assembly of the present invention; Figure 4 for Figure 3 Another perspective diagram of the structure; Figure 5 It is a schematic diagram of the internal circulation heat dissipation component of the present invention; Figure 6 for Figure 5 Another perspective diagram of the structure; Figure 7 It is a schematic diagram of the internal structure of part of the present invention; Figure 8 It is a schematic diagram of the structure of the external heat dissipation component of the present invention; Figure 9 It is a schematic diagram of the external heat dissipation assembly of the present invention; Figure 10Schematic diagram of the internal structure of the housing in the embodiment of the present invention.

[0016] Among them, 1. Pump body assembly; 101. Pump housing; 102. Connecting pipe head; 103. Heat dissipation fins; 104. Pump cover; 105. Main shaft; 106. Transmission shaft; 107. Main gear; 108. First sealing cover; 109. Sub-shaft; 110. Sub-gear; 111. Second sealing cover; 2. Internal circulation heat dissipation assembly; 201. First adapter; 2011. First upper bowl; 2012. Lower bowl; 202. Coiled pipe; 203. Second adapter; 2031. Second upper bowl; 2032. Cover ring; 204. First shaft cavity; 2041. First through hole; 205. Second shaft cavity; 2051. Second through hole; 2052. Third through hole; 206. First shaftless paddle; 207. First guide cone; 208. Third shaft cavity; 2081. Fourth through hole; 209. Fourth shaft cavity; 2091. Fifth through hole; 210. Second shaftless paddle; 211. Second guide cone; 3. External heat dissipation assembly; 301. Fan blade; 302. First magnet block; 303. Second magnet block. Detailed implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] As Figure 1-10 shown, the embodiment of the present invention provides an anti-overheating gear pump applied to a hydraulic oil circuit, including a pump body assembly 1. As Figure 3-4 shown, the pump body assembly 1 includes a housing assembled by a pump housing 101 and a pump cover 104. A main shaft 105 is rotatably connected to the lower part inside the housing. A main gear 107 is installed in the middle of the outside of the main shaft 105. A first sealing cover 108 is arranged in the middle of one end of the main gear 107. A sub-shaft 109 is rotatably connected to the upper part inside the housing. A sub-gear 110 is installed in the middle of the outside of the sub-shaft 109. A second sealing cover 111 is arranged in the middle of one end of the sub-gear 110. The sub-gear 110 is meshed and connected with the main gear 107.

[0019] In this embodiment, the two meshing gears of this gear pump are closely matched together, that is, the main gear 107 and the sub-gear 110 mesh and rotate with each other in the housing. When rotating, the volume of the space on the disengaged side changes from small to large, forming a vacuum, sucking in the hydraulic oil, and the volume of the space on the meshing side changes from large to small, so as to squeeze the hydraulic oil together to achieve pumping out.

[0020] In this embodiment, an internal circulation heat dissipation component 2 is provided. The internal circulation heat dissipation component 2 includes a first channel that penetrates axially inside the main shaft 105 and a second channel that penetrates axially inside the auxiliary shaft 109. The first channel and the second channel are connected end to end outside the housing to form a square-shaped loop. Shaftless paddle structures are provided inside both the first channel and the second channel to drive the coolant to circulate in the above loop when the main shaft 105 and the auxiliary shaft 109 rotate.

[0021] For existing gear pumps, their heat dissipation methods mostly rely on direct air cooling through the outside of the housing or additional installation of jackets for liquid cooling. However, for mechanical engineering equipment, such as excavator equipment, the operating temperature of its hydraulic system is around 50 to 80 degrees Celsius. The high-temperature hydraulic oil will cause the gears inside the gear pump to quickly heat up and always be in a high-temperature environment. At this time, relying solely on the existing heat dissipation methods outside the housing, the effect is not high. Moreover, the heated gears will undergo subtle structural changes, resulting in the gears not actually meshing or excessive friction, which easily damages the gear structure. Therefore, during the long-term reciprocating construction operation of engineering machinery, if the inside of the pump is not cooled in time, it will lead to phenomena such as gear tooth surface wear, gluing, and breakage, thereby greatly reducing the life of the pump. Therefore, the heat dissipation of the internal gears is of utmost importance. For this reason, the present solution envisions an internal liquid cooling loop for the above gear pump, focusing on cooling the inside of the gear components to prevent the gear pump from overheating and ensure its use.

[0022] In this embodiment, an external heat dissipation component 3 is further included. The external heat dissipation component 3 is provided on one side of the pump body component 1 and is driven by the rotating auxiliary shaft 109 through a magnetic coupling drive structure to air-cool the coolant flowing in the loop, combining air cooling and liquid cooling to ensure the heat dissipation effect.

[0023] Specifically, as Figure 5-7 shown, the first channel includes a first shaft cavity 204 provided inside one end of the main shaft 105 and a second shaft cavity 205 provided inside the other end of the main shaft 105. A first shaftless paddle 206 is installed inside the first shaft cavity 204. A first through hole 2041 communicating with the first shaft cavity 204 is provided on one side of the middle part of the main shaft 105, and a second through hole 2051 communicating with the second shaft cavity 205 is provided on the other side of the middle part of the main shaft 105. Both the first through hole 2041 and the second through hole 2051 are located inside the inner cavity of the main gear 107. A third through hole 2052 communicating with the second shaft cavity 205 is provided at the other end of the main shaft 105.

[0024] The second channel includes a third shaft cavity 208 disposed inside one end of the auxiliary shaft 109 and a fourth shaft cavity 209 disposed inside the other end of the auxiliary shaft 109. A second shaftless paddle 210 is installed inside the fourth shaft cavity 209. On one side of the middle part of the auxiliary shaft 109, there is a fourth through hole 2081 communicating with the third shaft cavity 208. On the other side of the middle part of the auxiliary shaft 109, there is a fifth through hole 2091 communicating with the fourth shaft cavity 209. Both the fourth through hole 2081 and the fifth through hole 2091 are located inside the inner cavity of the auxiliary gear 110.

[0025] As described above, cavities for the coolant to flow through are provided inside the main shaft 105, the main gear 107, the auxiliary shaft 109, and the auxiliary gear 110. Thus, when the coolant flows through these positions, it can carry away the heat inside the structure, thereby cooling the interior and preventing overheating.

[0026] The internal circulation heat dissipation assembly 2 further includes a first adapter 201 installed in the middle of one side of the pump cover 104 and a second adapter 203 installed in the middle of one side of the pump housing 101. The first adapter 201 includes a first upper cover bowl 2011 rotatably connected to the outside of one end of the auxiliary shaft 109 and a lower cover bowl 2012 rotatably connected to the outside of one end of the main shaft 105. The first upper cover bowl 2011 and the lower cover bowl 2012 are connected and communicated through a coiled pipe 202. The second adapter 203 includes a second upper cover bowl 2031 rotatably connected to the outside of the other end of the auxiliary shaft 109 and a cover ring 2032 rotatably connected to the outside of the other end of the main shaft 105. The second upper cover bowl 2031 and the cover ring 2032 are connected and communicated through a pipe.

[0027] The internal circulation heat dissipation assembly 2 further includes a first flow guide cone 207 installed outside the main shaft 105 between the first through hole 2041 and the second through hole 2051.

[0028] The internal circulation heat dissipation assembly 2 further includes a second flow guide cone 211 installed outside the auxiliary shaft 109 between the fourth through hole 2081 and the fifth through hole 2091.

[0029] A complete coolant circuit is formed among the above structures, ensuring the feasibility of internal cooling.

[0030] In this embodiment, taking the first shaftless paddle 206 as an example, the coolant inside the first shaft cavity 204, under the action of the first shaftless paddle 206, enters the lower cover bowl 2012 through the first shaft cavity 204, then enters the first upper cover bowl 2011 through the coiled pipe 202, and enters the auxiliary shaft 109 through the third shaft cavity 208. Then, it enters the inner cavity of the auxiliary gear 110 through the fourth through hole 2081, and under the guidance of the second flow guide cone 211, it fully contacts the inner wall of the auxiliary gear 110, and then enters the fourth shaft cavity 209 inside the auxiliary shaft 109 from the fifth through hole 2091.

[0031] Meanwhile, the auxiliary shaft 109 rotates under the action of gear transmission and drives the second shaftless paddle 210 to rotate. The second shaftless paddle 210 then exerts a pushing force on the coolant in the fourth shaft cavity 209. The pushed coolant enters the second upper cover bowl 2031 from the fourth shaft cavity 209, then enters the cover ring 2032, and then enters the second shaft cavity 205 through the third through hole 2052. Further, under the diversion of the second through hole 2051, it enters the inner cavity of the main gear 107. Finally, under the diversion of the first diversion cone 207, after fully contacting the inner wall of the main gear 107, it returns to the first shaft cavity 204 through the first through hole 2041 to complete the cycle. When the circulating coolant flows through the inside of the auxiliary shaft 109, auxiliary gear 110, main shaft 105, and main gear 107, it makes full contact with the structure, so it can take away the internal heat and exchange heat with the external environment in the coil 202, thereby achieving the effect of dissipating heat inside the pump body.

[0032] In this embodiment, as Figure 5-7 shown, the external heat dissipation component 3 includes a fan blade 301. The fan blade 301 is rotatably connected to the middle of one side of the first upper cover bowl 2011. The magnetic coupling drive structure includes a first magnet block 302 and a second magnet block 303. The first magnet block 302 is installed at one end of the shaft rod of the fan blade 301, and the second magnet block 303 is installed inside the orifice of the third shaft cavity 208.

[0033] In this embodiment, the magnetic coupling drive structure adopts existing mature technologies, such as various magnetic stirrers, etc., so its technical means will not be elaborated here.

[0034] Connecting pipe heads 102 for the inlet and outlet of hydraulic oil are respectively provided in the middle of both ends of the pump housing 101.

[0035] Radiating fins 103 are provided on the outside of the pump housing 101, enabling the housing to dissipate heat by radiation on its own.

[0036] A transmission shaft 106 is installed inside the orifice of the second shaft cavity 205.

[0037] The first sealing cover 108 is in spline fit with both the main shaft 105 and the main gear 107, and the second sealing cover 111 is in spline fit with both the auxiliary shaft 109 and the auxiliary gear 110.

[0038] As Figure 10 shown, naturally, to ensure the rationality and feasibility of the device, the main shaft 105, auxiliary shaft 109 are rotationally connected to the pump housing 101 and pump cover 104, and between the first adapter 201, second adapter 203 and the main shaft 105, auxiliary shaft 109 through bearings, and are sealed with seals to ensure airtightness. The sealing structure includes but is not limited to sealing rubber rings, end covers, etc.

[0039] When this solution is in operation, the drive shaft 106 is connected to the output end of the prime mover. Then, the main shaft 105 drives the auxiliary shaft 109, causing the main gear 107 and the auxiliary gear 110 to continuously engage, achieving the function of the gear pump to pump hydraulic oil. At the same time, when the main shaft 105 rotates, it drives the first shaftless impeller 206 to rotate, and when the auxiliary shaft 109 rotates, it drives the second shaftless impeller 210 to rotate, thereby pushing the coolant to form a liquid cooling circuit.

[0040] Taking the first shaftless impeller 206 as an example, the coolant inside the first shaft cavity 204, under the action of the first shaftless impeller 206, enters the lower cover bowl 2012 through the first shaft cavity 204, then enters the first upper cover bowl 2011 through the coil pipe 202, and enters the auxiliary shaft 109 through the third shaft cavity 208. Then, it enters the inner cavity of the auxiliary gear 110 through the fourth through hole 2081, and under the diversion of the second diversion cone 211, it fully contacts the inner wall of the auxiliary gear 110, and then enters the fourth shaft cavity 209 inside the auxiliary shaft 109 through the fifth through hole 2091.

[0041] At the same time, the auxiliary shaft 109 rotates under the action of gear transmission and drives the second shaftless impeller 210 to rotate. The second shaftless impeller 210 also exerts a pushing force on the coolant in the fourth shaft cavity 209. The pushed coolant enters the second upper cover bowl 2031 from the fourth shaft cavity 209, then enters the cover ring 2032, and then enters the second shaft cavity 205 through the third through hole 2052. Then, under the diversion of the second through hole 2051, it enters the inner cavity of the main gear 107, and finally, under the diversion of the first diversion cone 207, after fully contacting the inner wall of the main gear 107, it returns to the first shaft cavity 204 through the first through hole 2041 to complete the cycle. When the above-mentioned circulating coolant flows through the inside of the auxiliary shaft 109, the auxiliary gear 110, as well as the main shaft 105 and the main gear 107, it fully contacts the structure, so it can take away the internal heat and exchange heat with the external environment in the coil pipe 202, thereby achieving the effect of dissipating heat inside the pump body, preventing the gear pump from overheating. Further, through the magnetic coupling drive structure, the rotating auxiliary shaft 109 drives the fan blade 301 to rotate, thereby forcibly air-cooling the coil pipe 202 and improving the working efficiency of the liquid cooling circuit. This solution avoids the low efficiency of the existing external heat dissipation method, combines internal and external heat dissipation, and is more suitable for engineering machinery equipment in high-temperature hydraulic working environments.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An overheat-proof gear pump used in a hydraulic oil circuit, comprising a pump body assembly (1), an internal circulation heat dissipation assembly (2) and an external heat dissipation assembly (3), characterized in that: The pump body assembly (1) comprises a housing formed by assembling a pump shell (101) and a pump cover (104); a main shaft (105) is rotatably connected to the lower part of the housing; a main gear (107) is installed in the middle of the main shaft (105); a first sealing cover (108) is provided in the middle of one end of the main gear (107); a secondary shaft (109) is rotatably connected to the upper part of the housing; a secondary gear (110) is installed in the middle of the secondary shaft (109); a second sealing cover (111) is provided in the middle of one end of the secondary gear (110); and the secondary gear (110) is meshingly connected to the main gear (107); The internal circulation heat dissipation component (2) comprises a first channel extending in an axial direction inside the main shaft (105) and a second channel extending in an axial direction inside the secondary shaft (109), the first channel and the second channel being connected end to end outside the shell to form a U-shaped loop, and shaftless paddle structures are provided inside the first channel and the second channel to drive the coolant to circulate in the above loop when the main shaft (105) and the secondary shaft (109) rotate; The external heat dissipation component (3) is arranged on one side of the pump body component (1), and is driven by the rotating secondary shaft (109) through a magnetic coupling transmission structure, so as to air-cool the circulating coolant.

2. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 1, characterized in that: The first channel comprises a first shaft cavity (204) arranged inside one end of the main shaft (105) and a second shaft cavity (205) arranged inside the other end of the main shaft (105); a first shaftless blade (206) is installed inside the first shaft cavity (204); a first through hole (2041) communicating with the first shaft cavity (204) is arranged on one side of the middle of the main shaft (105); a second through hole (2051) communicating with the second shaft cavity (205) is arranged on the other side of the middle of the main shaft (105); the first through hole (2041) and the second through hole (2051) are both located in the inner cavity of the main gear (107); and a third through hole (2052) communicating with the second shaft cavity (205) is arranged at the other end of the main shaft (105).

3. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 1, characterized in that: The second channel comprises a third shaft cavity (208) arranged inside one end of the secondary shaft (109) and a fourth shaft cavity (209) arranged inside the other end of the secondary shaft (109); a second shaftless blade (210) is installed inside the fourth shaft cavity (209); a fourth through hole (2081) communicating with the third shaft cavity (208) is arranged on one side of the middle of the secondary shaft (109); a fifth through hole (2091) communicating with the fourth shaft cavity (209) is arranged on the other side of the middle of the secondary shaft (109); and the fourth through hole (2081) and the fifth through hole (2091) are both located in the inner cavity of the secondary gear (110).

4. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 1, characterized in that: The internal circulation heat dissipation assembly (2) further comprises a first adapter (201) mounted in the middle of one side of the pump cover (104) and a second adapter (203) mounted in the middle of one side of the pump housing (101); the first adapter (201) comprises a first upper bowl (2011) rotatably connected to the outside of one end of the secondary shaft (109) and a lower bowl (2012) rotatably connected to the outside of one end of the main shaft (105); the first upper bowl (2011) and the lower bowl (2012) are connected via a coil (202); the second adapter (203) comprises a second upper bowl (2031) rotatably connected to the outside of the other end of the secondary shaft (109) and a cover ring (2032) rotatably connected to the outside of the other end of the main shaft (105); the second upper bowl (2031) and the cover ring (2032) are connected via a pipeline.

5. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 4, characterized in that: The internal circulation heat dissipation assembly (2) further comprises a first guide cone (207) installed outside the main shaft (105) and located between the first through hole (2041) and the second through hole (2051).

6. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 5, characterized in that: The internal circulation heat dissipation assembly (2) further comprises a second guide cone (211) mounted outside the secondary shaft (109) and located between the fourth through hole (2081) and the fifth through hole (2091).

7. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 1, characterized in that: The external heat dissipation component (3) comprises a fan blade (301), wherein the fan blade (301) is rotatably connected to the middle part of one side of the first upper bowl (2011), and the magnetic coupling transmission structure comprises a first magnet block (302) and a second magnet block (303), wherein the first magnet block (302) is mounted at one end of the shaft of the fan blade (301), and the second magnet block (303) is mounted inside the cavity opening of the third shaft cavity (208).

8. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 1, characterized in that: Connecting pipe heads (102) for the inlet and outlet of hydraulic oil are respectively provided at the middle of both ends of the pump housing (101); and heat dissipation fins (103) are provided outside the pump housing (101).

9. The overheat-proof gear pump used in a hydraulic oil circuit according to claim 2, characterized in that: A transmission shaft (106) is installed inside the cavity opening of the second shaft cavity (205).

Images