CN111237155A - A through-shaft axial piston pump for energy recovery - Google Patents

Abstract

The invention discloses a through-shaft axial piston pump for realizing energy recovery, which relates to the technical field of fluid machinery and comprises a pump body, a transmission shaft, a cylinder body and a swash plate. There is a piston, and also includes a piston reset device. The internal cavity of the cylinder includes a rodless cavity on the right side of the piston away from the swash plate, and a rod cavity on the left side of the rodless cavity with a piston rod. There is a rod. Both the cavity and the rodless cavity are communicated with the outside of the cylinder body through channels, and the pump body is also provided with a first fluid discharge channel, a first fluid suction channel, a second fluid intake channel, and a second fluid discharge channel. The invention effectively reduces the input of external force, realizes the recovery and utilization of waste energy, has a simple structure, is convenient to manufacture, improves the lubricating effect of the piston, reduces friction, brings good economic benefits, and has strong adaptability.

Description

A through-shaft axial piston pump for energy recovery

technical field

The invention relates to the technical field of fluid machinery, in particular to a through-shaft axial piston pump for realizing energy recovery.

Background technique

my country is rich in water resources, but the per capita occupancy is relatively small. At the same time, due to the relatively large population in my country, the demand for fresh water is very large. In my country's seawater desalination project, a large amount of waste concentrated seawater with a certain pressure energy will be generated. If the factory fails to make full use of the waste concentrated seawater, it will cause waste of energy in the waste fluid. It not only increases the manufacturing cost of fresh water and reduces production efficiency, but also affects the service life and utilization rate of seawater desalination equipment.

The main function of the traditional through-shaft axial piston pump is to distribute the flow through the distribution plate, and the piston moves back and forth in the cylinder to realize the suction of low-pressure fluid and the discharge of high-pressure fluid, and does not have the function of recovering the pressure energy of waste seawater. The ordinary high-pressure pump for seawater desalination also does not have the function of energy recovery, and the efficiency is lower. In order to improve the utilization efficiency of fluid mechanical energy, it is necessary to design a new type of pump that can complete the work of the axial piston pump and recover the pressure energy in the waste fluid, so as to achieve the purpose of energy saving.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a through-shaft axial piston pump that realizes energy recovery, greatly reduces the input of external force, realizes the recovery and utilization of waste energy, has a simple structure, is convenient to manufacture, improves the lubricating effect of the piston, and reduces friction. It brings good economic benefits and strong adaptability.

For solving the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A through-shaft axial piston pump for realizing energy recovery, comprising a pump body, a transmission shaft, a cylinder body coaxially and fixedly connected with the transmission shaft and arranged in the cavity of the pump body, and a cylinder body fixedly connected in the cavity of the pump body and the cylinder body. A swash plate whose axis forms a certain angle, the cylinder body is provided with axial holes evenly distributed along the circumference, a piston is arranged inside the axial hole, and one end of the piston passes through the bottom of the cylinder body and abuts on the swash plate, and also includes the reset of the piston. The inner cavity of the cylinder includes a rodless cavity on the right side of the piston away from the swash plate, and a rod cavity with a piston rod arranged inside the rodless cavity on the left side of the rodless cavity. Both the rod cavity and the rodless cavity pass through The channel is communicated with the outside of the cylinder body, and the pump body is also provided with a first fluid discharge channel, a first fluid suction channel, a second fluid intake channel, a second fluid discharge channel, and the outlet of the channel communicated with the rod cavity It is matched with the first fluid suction channel and the second fluid discharge channel, and the outlet of the channel communicated with the rodless cavity is matched with the first fluid discharge channel and the second fluid suction channel.

A further improvement of the technical solution of the present invention is that the piston reset device is a return spring, one end of the return spring is in contact with the piston, and the other end is in contact with the inner wall of the cylinder.

A further improvement of the technical solution of the present invention is that a distribution plate is arranged between the right end face of the cylinder body and the first fluid discharge channel, the first fluid suction channel, the second fluid intake channel and the second fluid discharge channel, and the distribution plate is arranged on the valve plate. The first fluid discharge area, the second fluid suction area, the first fluid suction area, and the second fluid discharge area are provided with four arc-shaped holes, the first fluid discharge area, the second fluid suction area, the first fluid The suction area and the second fluid discharge area correspond to the first fluid discharge channel, the second fluid suction channel, the first fluid suction channel, and the second fluid discharge channel, respectively.

A further improvement of the technical solution of the present invention is that: the outlets of the first fluid discharge channel, the first fluid suction channel, the second fluid suction channel, and the second fluid discharge channel are located on the outer wall of the pump, and the first fluid discharge channel, The first fluid intake channel, the second fluid intake channel, and the second fluid discharge channel extend along an L-shape in the pump body.

A further improvement of the technical solution of the present invention is that the first fluid discharge channel communicates with the outlet of the first fluid intake channel outside the pump, and the second fluid intake channel communicates with the outlet of the second fluid discharge channel outside the pump.

Owing to having adopted the above-mentioned technical scheme, the technical progress that the present invention obtains is:

The invention converts the pressure energy in the waste fluid into mechanical energy, and uses the pressure energy in the waste fluid together with the external force to push the piston to reciprocate in the cylinder to realize the suction of low-pressure fluid and the discharge of high-pressure fluid, greatly reducing the input of external force and realizing waste. The energy recovery and utilization has the advantages of simple structure and convenient manufacture, improving the lubrication effect of the piston, reducing friction, bringing good economic benefits and strong adaptability.

The setting of the return spring reduces the resistance of the piston to return and reduces the loss of power.

Setting the shape of the inflow channel and the outflow channel to be L-shaped reduces the occupation of the volume of the pump body, avoids the waste of materials, and ensures the strength of the pump body.

By changing the angle between the swash plate and the axis of the drive shaft, the displacement of the pump can be changed.

The four-zone distribution plate is used to distribute the flow to realize the suction and discharge of all fluids in one distribution plate, which greatly reduces the structural size of the pump, making the pump compact and reliable in operation.

Through the action of the piston, under the action of the distribution plate, in the process of pressurizing the useful fluid, the waste fluid containing a certain pressure energy is introduced into the rod cavity, and the useful fluid is pressurized together with the external force, which can greatly reduce the external force. to achieve energy recovery of waste fluids and reduce energy consumption.

By changing the ratio between the piston rod and the piston, the magnitude of the released pressure energy can be controlled, and then the magnitude of the input external force can be controlled, that is, the energy recovery efficiency can be controlled.

By changing the length of the piston rod, the maximum volume of the rodless cavity can be determined, and then the displacement of the pump can be changed

The invention has a wide range of applications and can be widely used to pressurize various fluids such as toxic and harmful gases, sewage, seawater and hydraulic oil.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of the distribution plate of the present invention;

Among them, 1, positioning pin, 2, swash plate, 3, left end cover, 4, slipper, 5, piston, 6, spring clip, 7, guide sleeve, 8, return spring, 9, pump body I, 10, flow distribution Disc, 11, pump body II, 12, drive shaft, 13, right end cover, 14, positioning pin, 15, cylinder body, 16, rod cavity, 17, rodless cavity, 18, first fluid suction channel, 19, The first fluid discharge channel, 20, the second fluid intake channel, 21, the second fluid discharge channel, 22, the first fluid discharge area, 23, the second fluid intake area, 24, the first fluid intake area, 25, A second fluid discharge area.

Detailed ways

Below in conjunction with embodiment, the present invention is described in further detail:

As shown in Figures 1 and 2, a through-shaft axial piston pump for energy recovery includes a pump body, a transmission shaft 12, a cylinder body 15, a swash plate 2, a piston 5, and a piston reset device. The drive shaft 12 of the cylinder block 15 is coaxially and fixedly connected, and the cylinder block 15 is arranged inside the cavity of the pump body. The swash plate 2 is fixedly connected inside the cavity of the pump body, and the swash plate 2 forms a certain angle with the axis of the cylinder body 15 . The cylinder body 15 is provided with axial holes evenly distributed along the circumference. A piston 5 is arranged inside the axial hole. One end of the piston 5 passes through the bottom of the cylinder body 15 and abuts on the swash plate 2. Do not move. The ball head of one end of the piston rod of the piston 5 is hinged on the sliding shoe 4 through the ball, and the other end of the piston 5 is compressed with a return spring 8. Under the action of the spring force, the sliding shoe 4 is always in close contact with the cylinder 15 during the rotation process. The swash plate 2 and the distribution plate 10 are respectively fixed on the left end cover 3 and the pump body II 11 through the locating pin 1 and the locating pin 14 on the inclined surface of the swash plate 2 with the axis of the transmission shaft 12 at a certain angle;

In the two closed volumes formed by the cylinder bore and the piston 5 , the inner cavity of the cylinder 15 includes a rodless cavity 17 and a rod cavity 16 . The rodless cavity 17 is located on the right side of the piston 5 and is a closed volume without the piston rod. The rodless cavity 17 is located on the side away from the swash plate 2 . The rod cavity 16 is located on the left side of the rodless cavity 17 , a piston rod is arranged inside the rod cavity 16 , and both the rod cavity 16 and the rodless cavity 17 communicate with the outside of the cylinder 15 through a channel. The useful fluid entering and exiting the rodless cavity 17 is the first fluid, and the waste fluid containing a certain pressure energy entering and exiting the rod cavity 16 is the second fluid.

The pump body is also provided with a first fluid discharge passage 18, a first fluid suction passage 19, a second fluid suction passage 20, and a second fluid discharge passage 21. The outlet of the passage communicated with the rod cavity 16 is connected to the first fluid. The fluid suction channel 19 and the second fluid discharge channel 21 are matched, and the outlet of the channel communicated with the rodless cavity 17 is matched with the first fluid discharge channel 18 and the second fluid intake channel 20 .

The piston reset device is a return spring 8 , one end of the return spring 8 is in contact with the piston 5 , and the other end is in contact with the inner wall of the cylinder 15 .

The pump body includes two parts, namely the pump body I9 with the swash plate 2 and the cylinder block 15 inside, and the first fluid discharge channel 18, the first fluid suction channel 19, the second fluid suction channel 20, The second fluid is discharged from the pump body II11 of the flow channel 21 .

A distribution plate 10 is provided between the right end face of the cylinder block 15 and the first fluid discharge channel 18 , the first fluid suction channel 19 , the second fluid intake channel 20 and the second fluid discharge channel 21 . The first fluid discharge area 22, the second fluid suction area 23, the first fluid suction area 24, and the second fluid discharge area 25 have four arc-shaped holes in cross-section. The first fluid discharge area 22 and the second fluid suction area 23 The first fluid suction area 24 and the second fluid discharge area 25 correspond to the first fluid discharge passage 18 , the second fluid suction passage 20 , the first fluid suction passage 19 and the second fluid discharge passage 21 respectively.

The outlets of the first fluid discharge passage 18 , the first fluid suction passage 19 , the second fluid suction passage 20 and the second fluid discharge passage 21 are located on the outer wall of the pump. The first fluid discharge passage 18 and the first fluid suction passage The flow channel 19 , the second fluid suction channel 20 and the second fluid discharge channel 21 extend along an L-shape in the pump body.

The first fluid discharge passage 18 communicates with the outlet of the first fluid suction passage 19 outside the pump, and the second fluid suction passage 20 communicates with the outlet of the second fluid discharge passage 21 outside the pump.

How it works or how to use it:

The external force drives the transmission shaft 12 to rotate, and the transmission shaft 12 drives the cylinder 15 to rotate through the splines.

When the drive shaft 12 drives the cylinder 15 to rotate, all the pistons in the upper cylinder in FIG. 1 extend relative to the cylinder to increase the volume of the rodless cavity 17 and generate negative pressure. The low-pressure useful fluid passes through the first cylinder under the action of atmospheric pressure. The second fluid suction channel 20 enters the rodless cavity 17 from the second fluid suction area 23 of the valve plate 10 . At the same time, the volume of the rod cavity 16 is reduced, and the waste fluid after performing work on the useful fluid passes through the waste fluid discharge area of the valve plate 14 . The second fluid discharge area 25 is discharged from the second fluid discharge channel 21; under the action of the swash plate 2, all pistons 5 in the lower cylinder 15 in FIG. 1 are retracted relative to the cylinder 15 to reduce the volume of the rodless cavity 17 , the pressure rises, and the pressurized useful fluid flows from the rodless cavity 17 through the first fluid discharge area 22 of the distribution plate 14 into the first fluid discharge channel 18 and is discharged out of the pump. At the same time, the waste fluid containing a certain pressure energy From the first fluid suction channel 19 through the first fluid suction area 24 of the valve plate 14 into the rod cavity 16 , the volume of the rod cavity 16 increases, and the pressure in the waste fluid containing a certain pressure energy acts on the rod cavity 16 On the piston 5, the force for pressurizing the useful fluid is generated, and the energy recovery process of discharging the high-pressure useful fluid and discarding the fluid containing a certain pressure energy is completed at the same time;

Every time the cylinder 15 makes one revolution, each piston 5 completes the process of sucking and pressing the first fluid and discharging and sucking the second fluid. Through the continuous rotation of the cylinder 15, the pressurized first fluid can be continuously output, To achieve the purpose of the axial piston pump to pressurize the fluid. In the process of pressurizing the first fluid in the rodless cavity 17, the second fluid in the rodless cavity 16 converts the pressure energy into mechanical energy, and pressurizes the first fluid in the rodless cavity 17 together with the external force, thereby realizing waste. The recycling of energy improves the utilization rate of energy, reduces the input of external force, and achieves the purpose of energy saving.

Claims (5)

1. A through-shaft axial piston pump for realizing energy recovery, comprising a pump body, a transmission shaft (12), a cylinder body (15) which is coaxially and fixedly connected with the transmission shaft (12) and is arranged inside the cavity of the pump body, a fixed The swash plate (2) is connected to the inside of the cavity of the pump body and forms a certain angle with the axis of the cylinder body (15). The cylinder body (15) is provided with axial holes evenly distributed along the circumference, and a piston is provided inside the axial hole (5), one end of the piston (5) passes through the bottom of the cylinder (15) and abuts on the swash plate (2), characterized in that it also includes a piston reset device, and the internal cavity of the cylinder (15) includes a piston located at the bottom of the cylinder (15). (5) The rodless cavity (17) on the right side away from the swash plate (2) and the rod cavity (16) with the piston rod disposed inside the rodless cavity (17) on the left side, and the rod cavity (16) ) and the rodless cavity (17) are both communicated with the outside of the cylinder (15) through channels, and the pump body is also provided with a first fluid discharge channel (18), a first fluid suction channel (19), and a second fluid suction channel (19). The channel (20), the second fluid discharge channel (21), the outlet of the channel communicated with the rod cavity (16) is matched with the first fluid suction channel (19) and the second fluid discharge channel (21) , the outlet of the channel communicated with the rodless cavity (17) is matched with the first fluid discharge channel (18) and the second fluid intake channel (20). 2. A through-shaft axial piston pump for energy recovery according to claim 1, characterized in that: the piston reset device is a return spring (8), and one end of the return spring (8) is connected to the piston (5) The other end is in contact with the inner wall of the cylinder (15). 3. A through-shaft axial piston pump for energy recovery according to claim 1, characterized in that: the right end face of the cylinder (15) is connected to the first fluid discharge channel (18) and the first fluid suction channel (19) A distribution plate (10) is arranged between the second fluid suction channel (20) and the second fluid discharge channel (21), and the distribution plate (10) is provided with a first fluid discharge area (22), a first fluid discharge area (22), a The second fluid suction area (23), the first fluid suction area (24), and the second fluid discharge area (25) have four arc-shaped holes, the first fluid discharge area (22), the second fluid suction area (25) 23), the first fluid suction area (24), and the second fluid discharge area (25) are respectively connected with the first fluid discharge channel (18), the second fluid suction channel (20), the first fluid suction channel (19), The second fluid discharge channel (21) corresponds to. 4. A through-shaft axial piston pump for realizing energy recovery according to claim 1, characterized in that: the first fluid discharge channel (18), the first fluid suction channel (19), the second fluid The outlets of the suction passage (20) and the second fluid discharge passage (21) are located on the outer wall of the pump, the first fluid discharge passage (18), the first fluid suction passage (19), and the second fluid suction passage (20) . The second fluid discharge channel (21) extends along the L-shape in the pump body. 5 . The through-shaft axial piston pump for energy recovery according to claim 1 , wherein the first fluid discharge channel ( 18 ) is connected to the outlet of the first fluid suction channel ( 19 ) outside the pump. 6 . The second fluid suction channel (20) communicates with the outlet of the second fluid discharge channel (21) outside the pump body.

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