A unidirectional constant pressure variable hydraulic energy conversion device

Abstract

The present invention relates to the technical field of hydraulic power conversion, and specifically to a unidirectional constant pressure variable hydraulic energy conversion device, comprising a first housing and a second housing, the first housing and the second housing being connected together through a mounting seat, a first oil inlet and a first oil outlet being provided at the end of the first housing, a first oil return port being provided on the mounting seat, a first cavity being provided inside the first housing, a first inner shaft being provided in the first cavity, a first rotor and a first swash plate being provided on the first inner shaft, a first plunger component being provided on the first rotor, and a return plate assembly being provided on the first swash plate. The present invention can realize the unidirectional conversion and transmission of hydraulic energy from hydraulic system No. Ⅰ to hydraulic system No. Ⅱ and ensure the constant pressure variable demand of the output power of hydraulic system No. Ⅱ to ensure the safety of hydraulic system No. Ⅱ, improve the safety and reliability of the system, effectively avoid the loss of hydraulic system function, and effectively guarantee the smooth completion of tasks and the safety of equipment.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic power conversion and constant pressure variable technology, and in particular to a unidirectional constant pressure variable hydraulic energy conversion device. Background Art

[0002] Hydraulic pumps and hydraulic motors are the power element and actuator of hydraulic systems respectively, and play a very important role in hydraulic systems. Hydraulic pumps convert mechanical energy into hydraulic energy, providing hydraulic energy with a certain pressure and flow rate for hydraulic system users. Hydraulic motors convert hydraulic energy into mechanical energy, providing mechanical energy with a certain torque and speed for actuators. Electric pumps are used in some hydraulic systems, and electric pumps convert electrical energy into hydraulic energy.

[0003] With the development of industrial automation and intelligence, more and more customers who use hydraulic products have put forward higher requirements for the reliability and safety of hydraulic systems. Usually, when designing an important hydraulic system, two or more hydraulic systems are generally designed and these hydraulic systems are independent of each other. Each hydraulic system is responsible for or undertakes independent functions and tasks. In each independent hydraulic system, a separate hydraulic pump or electric pump is installed and arranged. By inputting the mechanical energy or electrical energy of the system to the hydraulic pump or electric pump, and then outputting hydraulic energy with a certain pressure and flow, once the function of the hydraulic pump or electric pump disappears and the performance is reduced, the function of the hydraulic system will be lost, and the mission and task cannot be completed, affecting the safety of the entire equipment or machine. In severe cases, accidents and disasters involving machine destruction and loss of life will occur. Therefore, it is urgent to propose a unidirectional constant pressure variable hydraulic energy conversion device. Summary of the invention

[0004] The purpose of the present invention is to provide a unidirectional constant pressure variable hydraulic energy conversion device to solve the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to achieve its purpose is as follows:

[0006] A unidirectional constant pressure variable hydraulic energy conversion device comprises a first housing and a second housing, wherein the first housing and the second housing are connected together through a mounting seat, a first oil inlet and a first oil outlet are provided at the end of the first housing, a first oil return port is provided on the mounting seat, a first cavity is provided inside the first housing, a first inner shaft is installed in the first cavity, a first rotor and a first swash plate are installed on the first inner shaft, a first plunger component is installed on the first rotor, and a return plate assembly is installed on the first swash plate; a second oil inlet and a second oil outlet are provided at the end of the second housing, a second cavity is provided inside, and a second oil return port is provided on the mounting seat, A second inner shaft is installed in the second cavity, a second rotor and a second swash plate are installed on the second inner shaft, a second plunger component is installed on the second rotor, a chuck is installed on the second swash plate, a valve chamber and a valve core adapted to the valve chamber are also provided in the second housing, an oil circuit oblique hole connected to the second oil outlet is provided between the valve chamber and the outer side of the second housing, a piston chamber is provided in the mounting seat, a spring and a piston are installed in the piston chamber, and one side of the second swash plate is located between the valve core and the piston; the first inner shaft and the second inner shaft are on the same straight line and are connected through a transmission shaft arranged in the mounting seat, and a sealing assembly is provided in the mounting seat.

[0007] Furthermore, a first bushing is installed in the first cavity, and a first rotor bearing matched with the first rotor is arranged in the first bushing.

[0008] Furthermore, an oil separator cap is provided at the end of the first shell, and the first oil inlet is arranged on the oil separator cap.

[0009] Furthermore, a pressure plate for fixing the chuck is provided on the second inclined plate.

[0010] Furthermore, an oil distribution plate is provided between the end of the second rotor and the inner wall of the second cavity.

[0011] Furthermore, a swash plate trunnion bearing is installed between the second swash plate and the second inner shaft.

[0012] Furthermore, the second inner shaft end is installed in the second housing through an oil separation cover bearing.

[0013] Further, the sealing assembly includes a first sealing mechanism for sealing between the first inner shaft and the mounting seat, and a second sealing mechanism for sealing between the second inner shaft and the mounting seat.

[0014] Furthermore, the mounting base is provided with four optical holes for mounting and fixing with equipment or machines.

[0015] Furthermore, the mounting seat is provided with an oil leakage interface connecting the first sealing mechanism and the second sealing mechanism.

[0016] The beneficial effects of the present invention are as follows: the transmission shaft is used to connect two independent hydraulic systems, and a sealing component is provided to isolate the two hydraulic systems. When hydraulic system No. 2 fails, the hydraulic energy of hydraulic system No. 1 is converted and transmitted to hydraulic system No. 2 without oil exchange, so that hydraulic system No. 2 can normally complete the system task. At the same time, it is ensured that the normal operation of hydraulic system No. 1 is not affected when hydraulic system No. 2 fails, and the inclination angle of the second swash plate can be self-adjusted and the size of its output flow can be adjusted according to the flow load demand of hydraulic system No. 2, so as to realize the constant-pressure variable function of No. 2 and ensure the safety of hydraulic system No. 2, realize the unidirectional conversion and transmission of hydraulic energy from hydraulic system No. 1 to hydraulic system No. 2 and ensure the constant-pressure variable demand of the output power of hydraulic system No. 2, ensure the safety of hydraulic system No. 2, improve the safety and reliability of the system, effectively avoid the loss of hydraulic system function, and effectively guarantee the smooth completion of the task and the safety of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but the scope of protection claimed in the present invention is not limited thereto.

[0019] Reference Figure 1 A unidirectional constant pressure variable hydraulic energy conversion device comprises a first housing 100 and a second housing 200, wherein the first housing 100 and the second housing 200 are connected together through a mounting seat 300, a first oil inlet 101 and a first oil outlet are arranged at the end of the first housing 100, a first oil return port 102 is arranged on the mounting seat 300, a first cavity 103 is arranged inside the first housing 100, a first inner shaft 104 is arranged in the first cavity 103, a first rotor 105 and a first swash plate 106 are arranged on the first inner shaft 104, a first plunger component 107 is arranged on the first rotor 105, and a return plate assembly 108 is arranged on the first swash plate 106.

[0020] The second housing 200 is provided with a second oil inlet 201 and a second oil outlet at the end thereof, and a second cavity 203 is provided inside thereof; the mounting seat 300 is provided with a second oil return port 202; a second inner shaft 204 is provided in the second cavity 203; a second rotor 205 and a second swash plate 206 are provided on the second inner shaft 204; a second plunger component 207 is provided on the second rotor 205; a chuck 208 is provided on the second swash plate 206; a valve cavity 209 and a valve core 210 adapted to the valve cavity 209 are also provided in the second housing 200; the valve cavity 209 and a second inner shaft 204 are provided with a second rotor 205 and a second swash plate 206; a second plunger component 207 is provided on the second rotor 205; a second swash plate 206 and a second inner shaft 204; a second inner shaft 204 ... An oil path oblique hole 211 connected to the second oil outlet is provided between the outer sides of the second housing 200, a piston chamber 310 is provided in the mounting seat 300, a spring 212 and a piston 213 are installed in the piston chamber 310, one side of the second slant plate 206 is located between the valve core 210 and the piston 213; a slant plate trunnion bearing 216 is installed between the second slant plate 206 and the second inner shaft 204; a pressure plate 214 for fixing the chuck 208 is provided on the second slant plate 206; an oil distribution plate 215 is provided between the end of the second rotor 205 and the inner wall of the second cavity 203. The first inner shaft 104 and the second inner shaft 204 are on the same straight line and are connected through a transmission shaft 320 placed in the mounting seat 300, and a sealing assembly 330 is provided in the mounting seat 300.

[0021] The first shell 100 is connected to the left side of the mounting seat 300, and the second shell 200 is connected to the right side of the mounting seat 300. The first shell 100 and the second shell 200 on both sides are isolated from each other by a sealing assembly 330 in the middle mounting seat 300. The first shell 100 on the left side is equivalent to a set of hydraulic motors, which can be marked as hydraulic system No. Ⅰ, and the second shell 200 on the right side is equivalent to a set of hydraulic pumps, which can be marked as hydraulic system No. Ⅱ. Since the two are connected by a transmission shaft 320, the hydraulic motor on the left can drive the hydraulic pump on the right side to rotate and output hydraulic power.

[0022] Specifically, the high-pressure oil input through the first oil inlet 101 enters the first housing 100 and then enters the first plunger cavity provided on the first rotor 105 and adapted to the first plunger component 107, thereby starting to push the first plunger component 107 to continuously extend outward, and the volume of the first plunger cavity continuously increases. The high-pressure oil acts on the first swash plate 106 through the first plunger component 107. The radial component of the reaction force of the first swash plate 106 to the first plunger component 107 causes the first rotor 105 to generate torque and perform rotational motion. The rotation of the first rotor 105 causes the first plunger component 107 and the return plate assembly 108 to rotate together, thereby driving the first inner shaft 104. Rotation; the first inner shaft 104 and the second inner shaft 204 are rigidly connected to the transmission shaft 320 through splines. When the first inner shaft 104 rotates, the second inner shaft 204 can be driven to rotate through the transmission shaft 320, and the second inner shaft 204 drives the second rotor 205 to rotate. The second plunger component 207 continues to extend outward from the bottom dead center, and the volume of the plunger cavity continues to increase until it stops at the top dead center. In this process, the first plunger cavity is just connected to the high-pressure oil inlet of the first oil inlet 101, and the high-pressure oil is pressed into the first plunger cavity. At the same time, the second plunger cavity on which the second plunger component 207 is installed is just connected to the second oil inlet 201, and the oil is sucked into the second plunger cavity.

[0023] As the first rotor 105 continues to rotate, the first plunger component 107 continuously enters the cavity from the top dead center under the constraint of the first swash plate 106, and the volume of the first plunger cavity continues to decrease until it stops at the bottom dead center; in this process, the first plunger cavity is just connected to the first oil outlet, and the oil is discharged through the first oil outlet. At the same time, the second plunger cavity is also just connected to the second oil outlet, and the oil is discharged through the second oil outlet. This is the oil discharge process of the hydraulic motor on the left and the hydraulic pump on the right. Due to the mechanical limit of the return plate assembly 108, there is an angle between the working surface of the first slanted plate 106 and the axis of the first plunger component 107. Similarly, due to the mechanical limit of the chuck 208 and the pressure plate 214, there is also an angle between the working surface of the second slanted plate 206 and the axis of the second plunger component 207. Whenever the first rotor 105 and the second rotor 205 rotate one circle, each plunger component in the hydraulic system on both sides will make a linear reciprocating motion and a circular motion with the rotor, with half a circle of oil suction and half a circle of oil discharge, and repeating over and over again, thereby achieving continuous oil suction and discharge. In addition, the leakage of oil between the friction pairs in the No. 1 hydraulic system flows back to the No. 1 hydraulic system through the first oil return port 102, and the leakage of oil between the friction pairs in the No. 2 hydraulic system flows back to the No. 2 hydraulic system through the second oil return port 202 to avoid oil leakage.

[0024] During operation, the pressure P of hydraulic system No. Ⅱ enters the valve chamber 209 through the oil circuit inclined hole 211 with a diameter of φb, and directly acts on the valve core 210 to exert a leftward liquid pressure Fy on the second swash plate 206. The spring 212 is in a pre-compression state, and the elastic force it generates is Ft, which is directed to the right and acts on the second swash plate 206 through the piston 213; when the pressure P is less than the set pressure value, the liquid pressure F is less than the elastic force of the spring 212, that is, Fy<Ft. The second swash plate 206 is always in the maximum inclination state under the support of a pair of swash plate ear shaft bearings 216 and the action of the elastic force of the spring 212. At this time, the right hydraulic system is in a large flow supply state. When it does not need flow supply, its system pressure will increase. When the pressure P is greater than the set pressure value, the liquid pressure is greater than the elastic force of the spring 212, that is, Fy>Ft. Under the push of the elastic force of the spring 212, the second swash plate 206 swings clockwise around a pair of swash plate ear shaft bearings 216, so that the inclination angle of the second swash plate 206 decreases and the output flow decreases. When the system pressure P continues to rise to the rated pressure, the inclination angle of the second slant plate 206 swings to zero, no flow output, and the pressure is always maintained at the rated pressure state. Since the difference between the set pressure and the rated pressure is small, the constant pressure variable process of the right hydraulic system is realized, which realizes that between the two independent hydraulic systems No. Ⅰ and No. Ⅱ, when the No. Ⅱ hydraulic system fails, the hydraulic energy of the No. Ⅰ hydraulic system is converted and transferred to the No. Ⅱ hydraulic system without oil exchange, so that the No. Ⅱ hydraulic system that fails can normally complete the system task. At the same time, it is ensured that the failure of the No. Ⅱ hydraulic system does not affect the normal operation of the No. Ⅰ hydraulic system, and the No. Ⅱ hydraulic system can self-adjust the inclination angle of the second slant plate 206 and adjust the size of its output flow according to the change requirements of its system flow load pressure, and finally realize the constant pressure variable function of the No. Ⅱ hydraulic system to ensure system safety. At the same time, it can be seen from the structure and working principle that the present invention can only realize the unidirectional conversion of hydraulic energy power from the No. Ⅰ hydraulic system to the No. Ⅱ hydraulic system.

[0025] By fixing the hydraulic motor and the hydraulic pump back-to-back on the mounting base and transmitting torque and speed through the transmission shaft, since a sealing assembly 330 is provided in the mounting base, it can be ensured that two independent hydraulic systems are formed on both sides of the mounting base 300, so that oil exchange does not occur between the two hydraulic systems. In addition, since the hydraulic pump on the right side has a pressure-regulating variable system composed of a valve chamber 209, a valve core 210, a piston chamber 310, a spring 212, a piston 213, etc., the constant pressure variable function of the output power of the hydraulic system on the right side can be realized. The present invention can be widely used between any two mutually independent No. 1 hydraulic systems and No. 2 hydraulic systems in all machinery and equipment equipped with hydraulic systems in various fields such as engineering machinery and ships. When a No. 2 hydraulic system fails, the hydraulic energy of the other No. 1 hydraulic system is converted and transmitted to the No. 2 hydraulic system that fails without oil exchange, so that the No. 2 hydraulic system that fails can normally complete the system task. At the same time, it is ensured that the normal operation of the No. 1 hydraulic system is not affected when the No. 2 hydraulic system fails, and the inclination angle of the second swash plate can be self-adjusted and the size of its output flow can be adjusted according to the flow load demand of the No. 2 hydraulic system, so as to realize the constant pressure variable function of the No. 2 hydraulic system and ensure the safety of the No. 2 hydraulic system, realize the unidirectional conversion and transmission of hydraulic energy from the No. 1 hydraulic system to the No. 2 hydraulic system and ensure the constant pressure variable demand of the output power of the No. 2 hydraulic system, so as to ensure the safety of the No. 2 hydraulic system and improve the safety and reliability of the system.

[0026] On the basis of the above-mentioned embodiment, a first bushing 109 is installed in the first cavity 103, and a first rotor bearing 110 adapted to the first rotor 105 is provided in the first bushing 109. The radial force of the first rotor 105 of the hydraulic system No. Ⅰ is borne by the first rotor bearing 110, and the first bushing 109 is used to mechanically limit the first rotor bearing 110. In addition, the end of the second inner shaft 204 is installed in the second housing 200 through the oil separator bearing 217, and the radial force of the second rotor 205 of the hydraulic system No. Ⅱ is borne by the oil separator bearing 217.

[0027] On the basis of the above-mentioned embodiment, an oil separator cover 111 is provided at the end of the first housing 100 to facilitate assembly and maintenance, and the first oil inlet 101 and the first oil outlet are arranged on the oil separator cover 111 .

[0028] On the basis of the above-mentioned embodiment, the sealing assembly 330 further includes a first sealing mechanism 331 which cooperates to seal between the first inner shaft 104 and the mounting seat 300, and a second sealing mechanism 332 which cooperates to seal between the second inner shaft 204 and the mounting seat 300. The first sealing mechanism 331 and the second sealing mechanism 332 are used to seal between the No. Ⅰ hydraulic system and the No. Ⅱ hydraulic system, and the two are isolated, so that the oil in the No. Ⅰ hydraulic system and the No. Ⅱ hydraulic system are independent of each other, and oil exchange does not occur.

[0029] The first sealing mechanism 331 and the second sealing mechanism 332 can adopt mechanical seals. Specifically, a first rear cover component 333 and a second rear cover component 334 for mounting the first sealing mechanism 331 and the second sealing mechanism 332 can be respectively arranged in the mounting seat 300, and the fixed ring 335 of the first sealing mechanism 331 and the fixed ring 336 of the second sealing mechanism 332 are respectively mounted on the first rear cover component 333 and the second rear cover component 334, while the dynamic ring 337 of the first sealing mechanism 331 and the dynamic ring 338 of the second sealing mechanism 332 are respectively mounted on the first inner shaft 104 and the second inner shaft 204. In this way, the sealing isolation of the two sides can be effectively realized by two sets of mechanical seals, so that the oil in the No. Ⅰ hydraulic system and the No. Ⅱ hydraulic system are independent of each other, and no oil exchange occurs.

[0030] On the basis of the above-mentioned embodiment, the mounting base 300 is provided with four optical holes 340 for mounting and fixing with a device or a machine, so as to perform mounting and connection by means of bolts adapted to the optical holes 340 .

[0031] On the basis of the above-mentioned embodiment, an oil leakage interface 350 communicating between the first sealing mechanism 331 and the second sealing mechanism 332 is provided on the mounting seat 300 .

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A unidirectional constant pressure variable hydraulic energy conversion device, comprising a first housing (100) and a second housing (200), wherein the first housing (100) and the second housing (200) are connected together via a mounting seat (300), characterized in that: The first housing (100) has a first oil inlet (101) and a first oil outlet at its end, the mounting seat (300) has a first oil return port (102), the first housing (100) has a first cavity (103) inside, a first inner shaft (104) is mounted in the first cavity (103), a first rotor (105) and a first swash plate (106) are mounted on the first inner shaft (104), and a first rotor (105) and a first swash plate (106) are mounted on the first rotor (105). The piston component (107) is provided with a return plate assembly (108) on the first swash plate (106); the second housing (200) is provided with a second oil inlet (201) and a second oil outlet at the end thereof, and a second cavity (203) is provided inside thereof; the mounting seat (300) is provided with a second oil return port (202); a second inner shaft (204) is provided in the second cavity (203); a second rotor (205) and a second swash plate (106) are provided on the second inner shaft (204); The second housing (200) is provided with a second piston member (207), the second rotor (205) is provided with a chuck (208), the second housing (200) is provided with a valve cavity (209) and a valve core (210) adapted to the valve cavity (209), an oil passage oblique hole (211) connected to the second oil outlet is provided between the valve cavity (209) and the outer side of the second housing (200), the mounting seat (30 0) is provided with a piston chamber (310), a spring (212) and a piston (213) are installed in the piston chamber (310), one side of the second swash plate (206) is located between the valve core (210) and the piston (213); the first inner shaft (104) and the second inner shaft (204) are on the same straight line and are connected through a transmission shaft (320) disposed in the mounting seat (300), and a sealing assembly (330) is provided in the mounting seat (300).

2. The one-way constant pressure variable hydraulic energy conversion device according to claim 1 is characterized in that: A first bushing (109) is installed in the first cavity (103), and a first rotor bearing (110) adapted to the first rotor (105) is arranged in the first bushing (109).

3. The one-way constant pressure variable hydraulic energy conversion device according to claim 1 is characterized in that: An oil separation cover (111) is provided at the end of the first housing (100), and the first oil inlet (101) is arranged on the oil separation cover (111).

4. The one-way constant pressure variable hydraulic energy conversion device according to claim 1 is characterized in that: A pressing plate (214) for fixing the chuck (208) is provided on the second inclined plate (206).

5. The one-way constant pressure variable hydraulic energy conversion device according to claim 1 is characterized in that: An oil distribution plate (215) is provided between the end of the second rotor (205) and the inner wall of the second cavity (203).

6. The one-way constant pressure variable hydraulic energy conversion device according to claim 1, characterized in that: A swash plate trunnion bearing (216) is installed between the second swash plate (206) and the second inner shaft (204).

7. The one-way constant pressure variable hydraulic energy conversion device according to claim 1, characterized in that: The end of the second inner shaft (204) is installed in the second housing (200) via an oil separation cover bearing (217).

8. The unidirectional constant pressure variable hydraulic energy conversion device according to any one of claims 1 to 7, characterized in that: The sealing assembly (330) includes a first sealing mechanism (331) for sealing between the first inner shaft (104) and the mounting seat (300), and a second sealing mechanism (332) for sealing between the second inner shaft (204) and the mounting seat (300).

9. The one-way constant pressure variable hydraulic energy conversion device according to claim 8, characterized in that: The mounting seat (300) is provided with four light holes (340) for mounting and fixing with equipment or machines.

10. The one-way constant pressure variable hydraulic energy conversion device according to claim 8, characterized in that: The mounting seat (300) is provided with an oil leakage interface (350) communicating between the first sealing mechanism (331) and the second sealing mechanism (332).

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