A multifunctional hydraulic pump

Abstract

The present invention discloses a multifunctional hydraulic pump, which is composed of three parts: a gear pump module, a lubrication and cooling module, and a switching valve module. The gear pump module includes a base and a gear set. A cavity adapted to the gear set is provided in the base. The two sides of the gear set form a first gear pump cylinder chamber and a second gear pump cylinder chamber. The base is provided with a first conveying medium inlet, a first conveying medium outlet, a first connection port, a second connection port, a fourth conveying medium inlet, and a fourth conveying medium outlet. The lubrication and cooling module includes a first mounting plate and a lubrication and cooling assembly. The switching valve module includes a second mounting plate, a first switching valve core assembly, and a second switching valve core assembly. The second mounting plate is provided with a second conveying medium inlet, a second conveying medium outlet, a third conveying medium inlet, a third conveying medium outlet, a third connection port, and a fourth connection port. The present invention has the function of transmitting multiple media, and can realize free switching between two conveying media without stopping the machine.

Description

Technical Field

[0001] The invention relates to a hydraulic pump, in particular to a multifunctional hydraulic pump. Background Art

[0002] The hydraulic pump is an important power component in the hydraulic system, providing hydraulic transmission power for the entire hydraulic system. It is widely used in many industrial fields such as coating, mining equipment, metallurgical equipment, construction machinery, engineering machinery, agricultural and forestry machinery, etc.

[0003] The functionality of the hydraulic pump has a very important impact on the performance of the pump. The existing hydraulic pumps are single-structure gear pumps, vane pumps, plunger pumps, screw pumps, etc. These hydraulic pumps can only achieve a single function of transmitting one medium, and their functions are relatively simple. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a multifunctional hydraulic pump.

[0005] The technical solution of the present invention is as follows:

[0006] A multifunctional hydraulic pump, which consists of three parts: a gear pump module, a lubrication cooling module and a switching valve module. The gear pump module includes a base and a gear set consisting of a driving gear and a driven gear meshing together. The lubrication cooling module includes a first mounting plate and a lubrication cooling assembly. The lubrication cooling assembly is arranged on the base through the first mounting plate. The lubrication cooling assembly includes a driving shaft. The switching valve module includes a second mounting plate, a first switching valve core assembly and a second switching valve core assembly. The first switching valve core assembly and the second switching valve core assembly are arranged on the base at intervals through the second mounting plate. The base is provided with a cavity adapted to the gear set, the driving gear is rotatably arranged in the cavity by the driving shaft, and the driven gear is rotatably arranged in the cavity by the driven shaft, and the two sides of the gear set and the inner side wall of the cavity form a first gear pump cylinder chamber and a second gear pump cylinder chamber that are connected, and the base is provided with a first conveying medium inlet, a first conveying medium outlet, a first connecting port, a second connecting port, a fourth conveying medium inlet and a fourth conveying medium outlet, a first liquid inlet channel is formed between the first conveying medium inlet and the first connecting port, and the fourth conveying medium inlet and the first connecting port are connected to each other. A fourth liquid inlet channel is formed between the gear pump cylinder chambers, a first liquid outlet channel is formed between the first conveying medium outlet and the second connecting port, a fourth liquid outlet channel is formed between the fourth conveying medium outlet and the second gear pump cylinder chamber, a second conveying medium inlet, a second conveying medium outlet, a third conveying medium inlet, a third conveying medium outlet, a third connecting port and a fourth connecting port are provided on the second mounting plate, a third liquid inlet channel is formed between the third connecting port and the third conveying medium inlet, a second liquid inlet channel is formed between the second conveying medium inlet and the third liquid inlet channel, and a fourth connecting port is provided between the fourth connecting port and the third conveying medium inlet. A third liquid outlet channel is formed between the medium outlets, a second liquid outlet channel is formed between the second conveying medium outlet and the third liquid outlet channel, the third conveying medium inlet and the third conveying medium outlet correspond to the fourth conveying medium inlet and the fourth conveying medium outlet respectively, the third connecting port and the fourth connecting port correspond to the first connecting port and the second connecting port respectively, a passage is formed between the first liquid inlet channel or the second liquid inlet channel and the third liquid inlet channel by switching through the first switching valve core component, and a passage is formed between the first liquid outlet channel or the second liquid outlet channel and the third liquid outlet channel by switching through the second switching valve core component.

[0007] Furthermore, the first switching valve core assembly, the second switching valve core assembly and the second mounting plate are connected via threads.

[0008] Further, the first switching valve core assembly includes a first valve sleeve, a first spring, a first piston and a first shaft core, the first valve sleeve is provided with a first movable chamber, the first piston is movably arranged in the first movable chamber and the first spring is arranged between the first valve sleeve, the first shaft core is movably arranged on the first valve sleeve, the tail of the first shaft core extends into the first movable chamber and is connected to the first piston, the head of the first shaft core extends from the first valve sleeve and is movably located in the third liquid inlet flow channel, so as to block the liquid outlet of the first liquid inlet flow channel or the liquid outlet of the second liquid inlet flow channel;

[0009] The second switching valve core assembly includes a second valve sleeve, a second spring, a second piston and a second shaft core, the second valve sleeve is provided with a second movable chamber, the second piston is movably arranged in the second movable chamber and the second spring is arranged between the second valve sleeve, the second shaft core is movably arranged on the second valve sleeve, the tail of the second shaft core extends into the second movable chamber and is connected with the second piston, the head of the second shaft core extends from the second valve sleeve and is movably located in the third liquid outlet flow channel, and is used to block the liquid inlet of the first liquid outlet flow channel or the liquid inlet of the second liquid outlet flow channel;

[0010] The second mounting plate is provided with a first air pressure inlet, a second air pressure inlet, a first air pressure outlet, and a second air pressure outlet. The first air pressure inlet and the first air pressure outlet are respectively connected to the first active chamber, the second air pressure inlet and the second air pressure outlet are respectively connected to the second active chamber, and the first air pressure outlet and the second air pressure outlet are both blocked by a sealing plug.

[0011] Furthermore, the first shaft core and the first piston, and the second shaft core and the second piston are connected via threads.

[0012] Furthermore, several layers of sealing rings are arranged between the outer side walls of the first valve sleeve, the second valve sleeve and the second mounting plate, sealing rings are arranged between the outer side wall of the first piston and the first valve sleeve, between the outer side wall of the second piston and the second valve sleeve, sealing rings are arranged between the outer side wall of the first shaft core and the first valve sleeve, between the outer side wall of the second shaft core and the second valve sleeve, sealing rings are arranged between the third conveying medium inlet and the fourth conveying medium inlet, between the third conveying medium outlet and the fourth conveying medium outlet, and sealing rings are arranged between the third connecting port and the first connecting port, between the fourth connecting port and the second connecting port.

[0013] Furthermore, the base is composed of a bottom plate, a middle plate and a cover plate from bottom to top, the cavity is located in the middle plate, and the first liquid inlet channel, the first liquid outlet channel, the fourth liquid inlet channel, and the fourth liquid outlet channel are located in the cover plate.

[0014] Furthermore, a sealing ring is provided between the bottom plate, the cover plate and the middle plate.

[0015] Furthermore, the lubrication and cooling assembly is connected to the cover plate via threads.

[0016] Furthermore, the lubrication and cooling assembly also includes a sealing sleeve, a sealing sleeve, a positioning pin, a sealing cover and a third spring. The main shaft is arranged on the sealing sleeve through the sealing sleeve. A cooling chamber is formed between the sealing sleeve and the sealing sleeve and the third spring is arranged. The sealing cover is arranged on the sealing sleeve. The positioning pin is arranged between the sealing sleeve and the sealing cover. A lubrication cooling inlet and a lubrication cooling outlet are also arranged on the base. The lubrication cooling inlet and the lubrication cooling outlet are respectively connected to the cooling chamber.

[0017] Furthermore, a sealing ring is provided between the outer wall of the main shaft and the sealing sleeve, an oil sealing ring is provided between the outer wall of the main shaft and the cover plate and the sealing sleeve, a sealing ring is provided between the outer wall of the main shaft and the cover plate and the middle plate, a sealing ring is provided between the sealing sleeve and the sealing sleeve, and a sealing ring is provided between the sealing sleeve and the cover plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The present invention can realize the function of transmitting multiple media through the switching valve module, and can realize the free switching between two conveying media of a hydraulic pump without stopping the machine, so as to avoid destroying the vacuum environment in the hydraulic pump during the process of changing the transmission medium, causing bubbles in the pipeline during the transmission process and inaccurate transmission data;

[0020] 2. The present invention can inject lubricating liquid to reduce the friction of the main shaft or inject coolant to cool down the hydraulic pump during its operation through the lubrication and cooling module to avoid the hydraulic pump being easily stuck due to high temperature during the transmission of certain media, which helps to increase the service life of the hydraulic pump;

[0021] 3. The present invention has a compact structure, high matching accuracy between various parts and a low friction coefficient, thereby improving the accuracy of hydraulic pump delivery, reducing wear during the operation of the hydraulic pump, and increasing the service life of the hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a three-dimensional structural diagram of the multifunctional hydraulic pump of the present invention;

[0024] Figure 2 It is a structural cross-sectional view of the plate in the present invention;

[0025] Figure 3 It is a structural cross-sectional view of the left part of the present invention;

[0026] Figure 4 It is a structural cross-sectional view of the right part of the present invention;

[0027] Figure 5 It is a structural cross-sectional view of the lubrication and cooling module part of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration. Example

[0030] See also Figures 1 to 5 This embodiment provides a multifunctional hydraulic pump, which consists of three parts: a gear pump module 1, a lubrication and cooling module 2 and a switching valve module 3.

[0031] The gear pump module 1 includes a base composed of a bottom plate 11, a middle plate 12 and a cover plate 13 from bottom to top, and a gear set composed of a driving gear 14 and a driven gear 15 meshing. A sealing ring 4 is arranged between the bottom plate 11, the cover plate 13 and the middle plate 12 to prevent leakage between the bottom plate 11, the middle plate 12 and the cover plate 13 due to the high pressure of the liquid during the liquid transportation process. A cavity adapted to the gear set is arranged in the middle plate 12, and the driving gear 14 is rotatably arranged in the cavity through the driving shaft 221. The driving shaft 221 is connected with the driving gear 14 through the key 222 to ensure that the driving shaft and the driving gear 14 move relative to each other during the rotation process; the driven gear 15 is rotatably arranged in the cavity through the driven shaft 16. Under the condition of ensuring that the driven shaft 16 and the driven gear 15 rotate smoothly relative to each other, the driven shaft 16 and the driven gear 15 are matched with a small gap to prevent the driven shaft 16 and the driven gear 15 from moving radially during the rotation process, resulting in changes in pressure and flow during the transportation process. The two sides of the gear set and the inner wall of the cavity form a first gear pump cylinder chamber 17 and a second gear pump cylinder chamber 18 that are connected. The cover plate 13 is provided with a first conveying medium inlet 131, a first conveying medium outlet 132, a first connection port, a second connection port, a fourth conveying medium inlet, a fourth conveying medium outlet, a lubrication cooling inlet 133 and a lubrication cooling outlet 134. A first liquid inlet channel 135 is formed between the first conveying medium inlet 131 and the first connection port, a fourth liquid inlet channel 136 is formed between the fourth conveying medium inlet and the first gear pump cylinder chamber 17, a first liquid outlet channel 137 is formed between the first conveying medium outlet 132 and the second connection port, and a fourth liquid outlet channel 138 is formed between the fourth conveying medium outlet and the second gear pump cylinder chamber 18.

[0032] The lubricating and cooling module 2 is an independent module, which includes a first mounting plate 21 and a lubricating and cooling assembly 22. The lubricating and cooling assembly 22 is arranged on the cover plate 13 through the first mounting plate 21, and the lubricating and cooling assembly 22 is connected to the cover plate 13 through a thread. The lubricating and cooling assembly 22 includes a driving shaft 221, a sealing sleeve 223, a sealing sleeve 224, a positioning pin 225, a sealing gland 226 and a third spring 227. The main shaft 221 is arranged on the sealing sleeve 223 through the sealing sleeve 224, a cooling chamber is formed between the sealing sleeve 224 and the sealing sleeve 223, and a third spring 227 is arranged. The sealing sleeve 224 is provided with a sealing gland 223, and a positioning pin 225 is arranged between the sealing sleeve 223 and the sealing gland 226. The lubricating and cooling inlet 133 and the lubricating and cooling outlet 134 are respectively connected to the cooling chamber. A sealing ring 4 is arranged between the outer wall of the main shaft 221 and the sealing sleeve 224, an oil sealing ring 5 is arranged between the outer wall of the main shaft 221 and the cover plate 13 and the sealing sleeve 223, a sealing ring 4 is arranged between the outer wall of the main shaft 221 and the cover plate 13 and the middle plate 12, a sealing ring 4 is arranged between the sealing sleeve 224 and the sealing sleeve 223, and a sealing ring 4 is arranged between the sealing sleeve and the cover plate.

[0033] The lubricant or coolant can be injected into the lubricant cooling module 2 before or during the operation of the hydraulic pump. The lubricant or coolant is injected into the lubricant cooling module 2 through the lubricant cooling inlet 133, thereby lubricating the driving shaft 221 or cooling the entire hydraulic pump.

[0034] Among them, the switching valve module 3 is fastened to the cover plate 13 by screws, and the switching valve module 3 includes a second mounting plate 31, a first switching valve core assembly 32 and a second switching valve core assembly 33. The first switching valve core assembly 32 and the second switching valve core assembly 33 are arranged on the cover plate 13 separated by the second mounting plate 31, and the first switching valve core assembly 32, the second switching valve core assembly 33 and the second mounting plate 31 are connected by threads. The second mounting plate 31 is provided with a second conveying medium inlet 311, a second conveying medium outlet 312, a third conveying medium inlet, a third conveying medium outlet, a third connecting port and a fourth connecting port. A third liquid inlet channel 314 is formed between the third connecting port and the third conveying medium inlet, a second liquid inlet channel 313 is formed between the second conveying medium inlet 311 and the third liquid inlet channel 314, a third liquid outlet channel 316 is formed between the fourth connecting port and the third conveying medium outlet, a second liquid outlet channel 315 is formed between the second conveying medium outlet 312 and the third liquid outlet channel 316, the third conveying medium inlet and the third conveying medium outlet correspond to the fourth conveying medium inlet and the fourth conveying medium outlet respectively, a sealing ring 4 is provided between the third conveying medium inlet and the fourth conveying medium inlet, and between the third conveying medium outlet and the fourth conveying medium outlet, the third connecting port and the fourth connecting port correspond to the first connecting port and the second connecting port respectively, a sealing ring 4 is provided between the third connecting port and the first connecting port, and between the fourth connecting port and the second connecting port. A passage is formed between the first liquid inlet channel 135 or the second liquid inlet channel 313 and the third liquid inlet channel 314 by switching through the first switching valve core assembly 32; a passage is formed between the first liquid outlet channel 137 or the second liquid outlet channel 315 and the third liquid outlet channel 316 by switching through the second switching valve core assembly 33.

[0035] Specifically, the first switching valve core assembly 32 includes a first valve sleeve 321, a first spring 322, a first piston 323 and a first shaft core 324. A first movable chamber is provided in the first valve sleeve 321. The first piston 323 is movably arranged in the first movable chamber and a first spring 322 is arranged between the first valve sleeve 321. The first shaft core 324 is movably inserted into the first valve sleeve 321. The tail of the first shaft core 324 extends into the first movable chamber and is threadedly connected with the first piston 323. The head of the first shaft core 324 extends from the first valve sleeve 321 and is movably located in the third liquid inlet channel 314, so as to block the liquid outlet of the first liquid inlet channel 135 or the liquid outlet of the second liquid inlet channel 313. The second switching valve core assembly 33 includes a second valve sleeve 331, a second spring 332, a second piston 333 and a second shaft core 334. A second movable chamber is provided in the second valve sleeve 331. The second piston 333 is movably arranged in the second movable chamber and a second spring 332 is arranged between the second valve sleeve 331. The second shaft core 334 is movably inserted into the second valve sleeve 331. The tail of the second shaft core 334 extends into the second movable chamber and is threadedly connected with the second piston 333. The head of the second shaft core 334 extends from the second valve sleeve 331 and is movably located in the third liquid outlet channel 316, so as to block the liquid inlet of the first liquid outlet channel 137 or the liquid inlet of the second liquid outlet channel 315. The second mounting plate 31 is also provided with a first air pressure inlet 317, a second air pressure inlet 318, a first air pressure outlet, and a second air pressure outlet. The first air pressure inlet 317 and the first air pressure outlet are respectively connected to the first active chamber, and the second air pressure inlet 318 and the second air pressure outlet are respectively connected to the second active chamber, and the first air pressure outlet and the second air pressure outlet are both blocked by a sealing plug 319. Several layers of sealing rings 4 are arranged between the outer wall of the first valve sleeve 321, the second valve sleeve 331 and the second mounting plate 31, a sealing ring 4 is arranged between the outer wall of the first piston 323 and the first valve sleeve 321, the outer wall of the second piston 333 and the second valve sleeve 331, and a sealing ring 4 is arranged between the outer wall of the first shaft core 324 and the first valve sleeve 321, the outer wall of the second shaft core 334 and the second valve sleeve 331.

[0036] When there is no input air pressure in the first active chamber of the first switching valve core assembly 32 and the second active chamber of the second switching valve core assembly 33. The first piston 323 and the first shaft core 324 of the first switching valve core assembly 32 are pushed out under the action of the first spring 322, and the conical surface at one end of the head of the first shaft core 324 blocks the liquid outlet of the first liquid inlet channel 135, thereby disconnecting the passage between the first liquid inlet channel 135 and the third liquid inlet channel 314, and connecting the second liquid inlet channel 313 and the third liquid inlet channel 314; the second piston 333 and the second shaft core 334 of the second switching valve core assembly 33 are pushed out under the action of the second spring 332, and the conical surface at one end of the head of the second shaft core 334 blocks the liquid inlet of the first liquid outlet channel 137, thereby disconnecting the passage between the first liquid outlet channel 137 and the third liquid outlet channel 316, and connecting the second liquid outlet channel 315 and the third liquid outlet channel 316.

[0037] When air pressure is input from the first air pressure inlet 317 and the second air pressure inlet 318 of the second mounting plate 31 into the first active chamber of the first switching valve core assembly 32 and the second active chamber of the second switching valve core assembly 33 , and the input air pressure is greater than the pressure of the first spring 322 and the second spring 332 . Under the action of air pressure, the first piston 323 of the first switching valve core assembly 32 drives the first shaft core 324 to retract, and the conical surface at the other end of the head of the first shaft core 324 blocks the liquid outlet of the second liquid inlet channel 313, thereby disconnecting the passage between the second liquid inlet channel 313 and the third liquid inlet channel 314, and connecting the first liquid inlet channel 135 and the third liquid inlet channel 314; the second piston 333 of the second switching valve core assembly 33 drives the second shaft core 334 to retract, and the conical surface at the other end of the head of the second shaft core 334 blocks the liquid inlet of the second liquid outlet channel 315, thereby disconnecting the passage between the second liquid outlet channel 315 and the third liquid outlet channel 316, and connecting the first liquid outlet channel 137 and the third liquid outlet channel 316.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional hydraulic pump, characterized in that: The multifunctional hydraulic pump is composed of three parts: a gear pump module, a lubrication cooling module and a switching valve module. The gear pump module includes a base and a gear set composed of a driving gear and a driven gear meshing. The lubrication cooling module includes a first mounting plate and a lubrication cooling assembly. The lubrication cooling assembly is arranged on the base through the first mounting plate. The lubrication cooling assembly includes a driving shaft. The switching valve module includes a second mounting plate, a first switching valve core assembly and a second switching valve core assembly. The first switching valve core assembly and the second switching valve core assembly are arranged on the base through the second mounting plate. A cavity adapted to the gear set is provided, the driving gear is rotatably arranged in the cavity by the driving shaft, the driven gear is rotatably arranged in the cavity by the driven shaft, a first gear pump cylinder chamber and a second gear pump cylinder chamber connected to each other are formed between the two sides of the gear set and the inner side wall of the cavity, a first conveying medium inlet, a first conveying medium outlet, a first connecting port, a second connecting port, a fourth conveying medium inlet and a fourth conveying medium outlet are provided on the base, a first liquid inlet channel is formed between the first conveying medium inlet and the first connecting port, the fourth conveying medium inlet and the first gear pump cylinder chamber are connected to each other, and a first liquid inlet channel is formed between the first conveying medium inlet and the first connecting port. A fourth liquid inlet channel is formed between the first conveying medium outlet and the second connecting port, a first liquid outlet channel is formed between the fourth conveying medium outlet and the second gear pump cylinder chamber, a second conveying medium inlet, a second conveying medium outlet, a third conveying medium inlet, a third conveying medium outlet, a third connecting port and a fourth connecting port are provided on the second mounting plate, a third liquid inlet channel is formed between the third connecting port and the third conveying medium inlet, a second liquid inlet channel is formed between the second conveying medium inlet and the third liquid inlet channel, and a fourth connecting port is provided between the fourth connecting port and the third conveying medium inlet. A third liquid outlet channel is formed between the outlets, a second liquid outlet channel is formed between the second conveying medium outlet and the third liquid outlet channel, the third conveying medium inlet and the third conveying medium outlet correspond to the fourth conveying medium inlet and the fourth conveying medium outlet respectively, the third connecting port and the fourth connecting port correspond to the first connecting port and the second connecting port respectively, a passage is formed between the first liquid inlet channel or the second liquid inlet channel and the third liquid inlet channel by switching through the first switching valve core component, and a passage is formed between the first liquid outlet channel or the second liquid outlet channel and the third liquid outlet channel by switching through the second switching valve core component.

2. A multifunctional hydraulic pump according to claim 1, characterized in that: The first switching valve core assembly, the second switching valve core assembly and the second mounting plate are connected via threads.

3. A multifunctional hydraulic pump according to claim 2, characterized in that: The first switching valve core assembly includes a first valve sleeve, a first spring, a first piston and a first shaft core, wherein a first movable chamber is provided in the first valve sleeve, the first piston is movably arranged in the first movable chamber and the first spring is arranged between the first valve sleeve, the first shaft core is movably arranged on the first valve sleeve, the tail of the first shaft core extends into the first movable chamber and is connected to the first piston, the head of the first shaft core extends from the first valve sleeve and is movably located in the third liquid inlet flow channel, so as to block the liquid outlet of the first liquid inlet flow channel or the liquid outlet of the second liquid inlet flow channel; The second switching valve core assembly includes a second valve sleeve, a second spring, a second piston and a second shaft core, the second valve sleeve is provided with a second movable chamber, the second piston is movably arranged in the second movable chamber and the second spring is arranged between the second valve sleeve, the second shaft core is movably arranged on the second valve sleeve, the tail of the second shaft core extends into the second movable chamber and is connected with the second piston, the head of the second shaft core extends from the second valve sleeve and is movably located in the third liquid outlet flow channel, and is used to block the liquid inlet of the first liquid outlet flow channel or the liquid inlet of the second liquid outlet flow channel; The second mounting plate is provided with a first air pressure inlet, a second air pressure inlet, a first air pressure outlet, and a second air pressure outlet. The first air pressure inlet and the first air pressure outlet are respectively connected to the first active chamber, the second air pressure inlet and the second air pressure outlet are respectively connected to the second active chamber, and the first air pressure outlet and the second air pressure outlet are both blocked by a sealing plug.

4. A multifunctional hydraulic pump according to claim 3, characterized in that: The first shaft core and the first piston, and the second shaft core and the second piston are connected via threads.

5. A multifunctional hydraulic pump according to claim 3, characterized in that: Several layers of sealing rings are arranged between the outer side walls of the first valve sleeve, the second valve sleeve and the second mounting plate, sealing rings are arranged between the outer side wall of the first piston and the first valve sleeve, between the outer side wall of the second piston and the second valve sleeve, sealing rings are arranged between the outer side wall of the first shaft core and the first valve sleeve, between the outer side wall of the second shaft core and the second valve sleeve, sealing rings are arranged between the third conveying medium inlet and the fourth conveying medium inlet, between the third conveying medium outlet and the fourth conveying medium outlet, and sealing rings are arranged between the third connecting port and the first connecting port, between the fourth connecting port and the second connecting port.

6. A multifunctional hydraulic pump according to claim 1, characterized in that: The base is composed of a bottom plate, a middle plate and a cover plate from bottom to top, the cavity is located in the middle plate, and the first liquid inlet channel, the first liquid outlet channel, the fourth liquid inlet channel and the fourth liquid outlet channel are located in the cover plate.

7. A multifunctional hydraulic pump according to claim 6, characterized in that: A sealing ring is arranged between the bottom plate, the cover plate and the middle plate.

8. A multifunctional hydraulic pump according to claim 6, characterized in that: The lubrication and cooling assembly is connected to the cover plate via threads.

9. A multifunctional hydraulic pump according to claim 8, characterized in that: The lubrication and cooling assembly also includes a sealing sleeve, a sealing sleeve, a positioning pin, a sealing cover and a third spring. The main shaft is arranged on the sealing sleeve through the sealing sleeve. A cooling chamber is formed between the sealing sleeve and the sealing sleeve and the third spring is arranged. The sealing cover is arranged on the sealing sleeve. The positioning pin is arranged between the sealing sleeve and the sealing cover. A lubrication cooling inlet and a lubrication cooling outlet are also arranged on the base. The lubrication cooling inlet and the lubrication cooling outlet are respectively connected to the cooling chamber.

10. A multifunctional hydraulic pump according to claim 9, characterized in that: A sealing ring is arranged between the outer wall of the main shaft and the sealing sleeve, an oil sealing ring is arranged between the outer wall of the main shaft and the cover plate and the sealing sleeve, a sealing ring is arranged between the outer wall of the main shaft and the cover plate and the middle plate, a sealing ring is arranged between the sealing sleeve and the sealing sleeve, and a sealing ring is arranged between the sealing sleeve and the cover plate.

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