CN110307151B

CN110307151B - Internal and external balance leakage-free diaphragm pressurized fluid device and balance method

Info

Publication number: CN110307151B
Application number: CN201910555726.4A
Authority: CN
Inventors: 王路文; 徐裕民; 杨文丽; 程瑜华; 汶飞; 董林玺; 王高峰
Original assignee: Hangzhou Dianzi University Wenzhou Research Institute Co Ltd
Current assignee: Hangzhou Dianzi University; Hangzhou Dianzi University Wenzhou Research Institute Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-06-16
Anticipated expiration: 2039-06-25
Also published as: CN110307151A

Abstract

The invention discloses an internal and external balance leakage-free diaphragm pressurized fluid device and a balance method. During operation of the eccentric pump, the rotor twists and stretches the isolating membrane, so that the volume in the transmission part changes at any moment. The invention relates to an internal and external balance leakage-free diaphragm pressurized fluid device, which comprises a pump shell, a pump fluid assembly, an isolation diaphragm and a pressure balance assembly. The liquid pumping assembly comprises a main shaft, a rotor barrel, a partition plate and a partition rotating shaft. The pressure balance assembly comprises a lubricating fluid exchange valve, a pressure balance tank and a pressure balance seat. The pressure balance tank comprises a balance tank body and a pressure balance membrane. The lubricating liquid exchange valve comprises an exchange valve body, a first valve cover, a second valve cover, a first pre-tightening spring and a second pre-tightening spring. When the volume of the mechanical transmission area of the stator cavity is changed, lubricating liquid is automatically sucked into or discharged from the first exchange cavity with automatically balanced pressure, and pressure fluctuation in the mechanical transmission area is reduced.

Description

Internal and external balance leakage-free diaphragm pressurized fluid device and balance method

Technical Field

The invention belongs to the technical field of booster pumps, and particularly relates to an internal and external balance leakage-free diaphragm booster fluid device and a balance method.

Background

In the existing eccentric pump (swing rotor pump), an isolation film is needed to separate a mechanical transmission part and an oil way in a pump body so as to ensure that lubricating liquid in the mechanical transmission part and hydraulic medium in the oil way are opposite to each other. However, the rotor of the eccentric pump can twist and stretch the isolating membrane during operation, so that the volume in the transmission part is changed at any moment, the pressure of lubricating liquid in the transmission part is continuously and greatly changed, the lubricating effect is greatly reduced, and the service life of the eccentric pump is shortened. Meanwhile, the separation membrane is subjected to variable load with a large change range for a long time, and is easy to break.

Disclosure of Invention

The invention aims to provide a pressurized fluid device with an internal and external balance leakage-free diaphragm and a balance method.

The invention relates to an internal and external balance leakage-free diaphragm pressurized fluid device which comprises a pump shell (1), a pump fluid assembly, an isolating membrane (3) and a pressure balance assembly. A stator cavity (1-1) is arranged in the pump shell (1). The stator cavity (1-1) is provided with a liquid inlet (1-2) and a liquid outlet (1-3). The liquid pumping assembly comprises a main shaft (2), a rotor barrel (5), a partition plate (6) and a partition rotating shaft (7). The main shaft (2) is supported in the pump housing (1). The main shaft (2) and the stator cavity (1-1) are coaxially arranged. An eccentric shaft section (2-1) is eccentrically arranged on the main shaft (2). The rotor barrel (5) is supported on the eccentric shaft section (2-1). The rotor barrel (5) divides the stator cavity (1-1) into an oil path area outside the rotor barrel (5) and a mechanical transmission area inside the rotor barrel (5).

The separation rotating shaft (7) is supported in the pump shell (1) and is positioned between the liquid inlet (1-2) and the liquid outlet (1-3) of the stator cavity (1-1). The partition plate (6) and the partition rotating shaft (7) form a sliding pair. The partition plate (6) and the rotor cylinder (5) form a revolute pair. The isolation film (3) is annular. The inner side edges of the two isolating membranes (3) are respectively fixed with two ends of the rotor barrel (5), and the outer side edges of the two isolating membranes are respectively fixed with two ends of the stator cavity.

The pressure balance assembly comprises a lubricating liquid exchange valve (8), a pressure balance tank (10) and a pressure balance seat (11). The pressure balance tank (10) comprises a balance tank body (10-1) and a pressure balance membrane (10-2). The pressure balance membrane (10-2) is arranged in the balance tank body (10-1) and divides the inner cavity of the balance tank body (10-1) into a first exchange cavity (10-6) and a second exchange cavity (10-7). The second exchange cavity (10-7) is communicated with the liquid outlet (1-3) of the stator cavity (1-1).

The pressure balance seat (11) is fixed with the pump shell (1). The lubricating fluid exchange valve (8) is arranged in the pressure balance seat (11). One end of the inner cavity of the pressure balance seat (11) is communicated with the mechanical transmission area of the stator cavity (1-1), and the other end is communicated with the first exchange cavity in the pressure balance tank (10). The lubricating liquid exchange valve (8) comprises an exchange valve body (8-1), a first valve cover (8-2), a second valve cover (8-3), a first pre-tightening spring (8-4) and a second pre-tightening spring (8-5). An input exchange flow passage (8-7) and an output exchange flow passage (8-8) are arranged in the exchange valve body (8-1). The first valve cover (8-2) is propped against one end of the exchange valve body (8-1) through a first pre-tightening spring (8-4); the second valve cover (8-3) is propped against the other end of the exchange valve body (8-1) through a first pre-tightening spring (8-4); the first valve cover (8-2) covers one end of the input exchange flow passage (8-7); the second valve cover (8-3) covers one end of the output exchange flow passage (8-8).

Furthermore, two ends of the stator cavity (1-1) are provided with diaphragm accommodating cavities (1-4). The diameter of the diaphragm placing cavity (1-4) is larger than that of the stator cavity (1-1). Both ends of the rotor barrel (5) are provided with mounting discs (5-1). The mounting disc (5-1) and the rotor barrel (5) are coaxially arranged. The two mounting discs (5-1) are respectively arranged in the two diaphragm arranging cavities (1-4). The inner side surfaces of the two mounting discs (5-1) are respectively contacted with the inner side surfaces of the two diaphragm arranging cavities (1-4). The sum of the radius of the stator cavity (1-1) and the eccentricity of the eccentric shaft section (2-1) is smaller than the radius of the mounting disc (5-1). Mounting holes are formed in the tops of the two mounting discs (5-1). The partition plate (6) is in a long strip shape. Two ends of the partition plate (6) are respectively supported on the two mounting discs (5-1). The bottom edge of the partition plate (6) is in a circular arc shape tangent to the outer circumferential surface of the rotor cylinder (5). The circular arc central axis of the bottom edge of the partition plate (6) is superposed with the axis of the mounting column. A sliding groove is arranged on one side of the side surface of the separation rotating shaft (7) close to the stator cavity. The partition plate (6) extends into the chute of the partition rotating shaft (7) to form a sliding pair with the partition rotating shaft (7) and the sliding direction of the sliding pair is vertical to the rotation axis of the main shaft (2). The inner side edge and the outer side edge of the isolating film (3) are provided with sealing installation rings. The sealing installation rings on the inner side edges of the two isolating membranes (3) are respectively clamped into the installation grooves on the inner side edges of the outer sides of the two installation discs (5-1). The sealing installation rings on the outer edges of the two isolating membranes (3) are respectively clamped into the installation grooves in the two membrane accommodating cavities (1-4).

Furthermore, the internal and external balance leakage-free diaphragm pressurized fluid device also comprises an exhaust valve (9). The exhaust valve (9) comprises an exhaust valve seat (9-1), an exhaust valve body (9-2), an exhaust valve core (9-3), an exhaust spring (9-4), a liquid sealing ball (9-5) and an exhaust pipe (9-9). The exhaust valve body (9-2) and the exhaust valve seat (9-1) are both fixed on the pump shell (1). The exhaust valve seat (9-1) is positioned above the exhaust valve body (9-2). An exhaust channel is arranged on the exhaust valve body (9-2). The bottom end of the exhaust channel is communicated with a mechanical transmission area of a stator cavity (1-1) in the pump shell (1). The bottom of the exhaust channel is provided with a limit ring (9-6), and the top is provided with a spring mounting section (9-7). The exhaust valve core (9-3) is arranged in the exhaust channel and is positioned between the limiting ring and the spring mounting section (9-7). Two ends of the exhaust spring (9-4) respectively support against the exhaust valve core (9-3) and the spring mounting section (9-7). A ball body placing cavity is arranged above the spring placing section (9-7). The closed ball is placed in the ball body placing cavity. A valve core flow passage is arranged in the exhaust valve core (9-3). The valve core flow passage is communicated with the ball body arranging cavity. The air outlet pipe (9-9) is fixed in the air outlet valve seat (9-1). The bottom of the air outlet pipe (9-9) is provided with an air outlet hole (9-8). The exhaust hole (9-8) is aligned with the sphere installation cavity in the exhaust valve body (9-2). The diameter of the vent hole (9-8) is smaller than that of the liquid sealing ball (9-5).

Furthermore, the pressure balance tank (10) also comprises a sliding disc (10-3), a fixing plate (10-4) and an expansion rod (10-5). The fixing plate (10-4) is fixed in the balance tank body (10-1). The top end of the telescopic rod (10-5) is fixed with the fixed plate (10-4), and the bottom end is fixed with the sliding disc (10-3). The pressure balance membrane (10-2) is tubular. The top end of the pressure balance membrane (10-2) is fixed with the bottom surface of the fixed plate (10-4), and the bottom end is fixed with the edge of the sliding disk (10-3). The fixed plate (10-4) is provided with a circulation port.

Further, the lubricating fluid exchange valve (8) also comprises a valve rod (8-6). The valve rod (8-6) passes through the exchange valve body (8-1) and is fixed with the exchange valve body (8-1). The first valve cover (8-2) and the second valve cover (8-3) are respectively sleeved at two ends of the valve rod (8-6). Two ends of the first pre-tightening spring (8-4) respectively abut against the outer side surface of the first valve cover (8-2) and the annular convex block at one end of the valve rod (8-6), so that the first valve cover (8-2) compresses the exchange valve body (8-1). Two ends of the second pre-tightening spring (8-5) respectively abut against the outer side surface of the second valve cover (8-3) and the annular convex block at the other end of the valve rod (8-6).

Further, the sum of the radius of the rotor barrel (5) and the eccentricity of the eccentric shaft section (2-1) is equal to the radius of the stator cavity (1-1).

Further, the side surface of the isolation membrane (3) is wavy inwards and outwards.

The pressure balancing method of the internal and external balance non-leakage diaphragm pressurized fluid device comprises the following specific steps:

the main shaft (2) rotates, and the stator cavity starts to pump liquid. In the process of pumping liquid, the two isolating membranes (3) deform, the volume of the mechanical transmission area of the stator cavity (1-1) changes, and the pressure of lubricating liquid in the mechanical transmission area of the stator cavity (1-1) changes.

When the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is increased, so that the pressure of the lubricating liquid in the output exchange flow channel (8-8) on the second valve cover (8-3) is larger than the sum of the pressure of the lubricating liquid in the first exchange chamber (10-6) on the second valve cover (8-3) and the pre-tightening force of the second pre-tightening spring (8-5) on the second valve cover (8-3), the lubricating liquid in the output exchange flow channel (8-8) props open the second valve cover (8-3), so that the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) flows to the first exchange chamber (10-6), and the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is reduced.

When the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is reduced, so that the pressure of the lubricating liquid in the input exchange flow channel (8-7) on the first valve cover (8-2) is greater than the sum of the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) on the first valve cover (8-2) and the pre-tightening force of the first pre-tightening spring (8-4) on the first valve cover (8-2), the lubricating liquid in the input exchange flow channel (8-7) pushes the first valve cover (8-2) open, so that the lubricating liquid in the first exchange cavity (10-6) flows to the mechanical transmission area of the stator cavity (1-1), and the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is improved.

In the process that the lubricating liquid in the first exchange cavity (10-6) flows in or out, the pressure balance film (10-2) deforms under the pressure action of the hydraulic medium in the first exchange cavity (10-6) and the second exchange cavity (10-7), so that the accommodating cavity of the first exchange cavity (10-6) changes along with the flowing in or out of the lubricating liquid, and the pressure of the lubricating liquid in the first exchange cavity (10-6) is kept stable.

The invention has the beneficial effects that:

1. by designing the lubricating liquid exchange valve and the pressure balancing tank with the automatic pressure balance, when the volume of the mechanical transmission area of the stator cavity changes, lubricating liquid is automatically sucked into or discharged from the first pressure balancing exchange cavity, the pressure fluctuation in the mechanical transmission area is reduced, the lubricating effect of the lubricating liquid on a bearing in the mechanical transmission area is improved, the pressure change of a separation membrane is reduced, and the service life of the separation membrane is prolonged.

2. The invention can automatically discharge the gas separated out from the lubricating liquid to the outside of the pump shell by designing the exhaust valve, thereby avoiding the gas mixed in the mechanical transmission part and reducing the lubricating effect.

3. The lubricating liquid exchange valve can convey lubricating liquid in two directions, provides a pressure difference threshold value for the two-way conveying of the lubricating liquid, reduces the flowing frequency of the lubricating liquid, and avoids reduction of the lubricating effect caused by frequent flowing of the lubricating liquid.

Drawings

FIG. 1 is a front cross-sectional view of the present invention;

FIG. 2 is a side sectional view of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 1;

FIG. 4 is a partial enlarged view of portion B of FIG. 1;

FIG. 5 is an enlarged view of a portion C of FIG. 1;

fig. 6 is a partially enlarged view of a portion D in fig. 1.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the internal and external balance non-leakage diaphragm pressurized fluid device comprises a pump shell 1, a pump fluid assembly, an isolation diaphragm 3, a pressure balance assembly and an exhaust valve 9. A stator cavity 1-1 is arranged in the pump shell 1. The stator cavity 1-1 is cylindrical. The inner circumferential surface of the stator cavity 1-1 is provided with a liquid inlet 1-2 and a liquid outlet 1-3. A liquid inlet 1-2 on the stator cavity 1-1 is communicated with an oil inlet interface on the pump shell 1, and a liquid outlet 1-3 is communicated with an oil outlet interface on the pump shell 1.

The pump liquid assembly comprises a main shaft 2, a first bearing 4, a rotor barrel 5, a partition plate 6 and a partition rotating shaft 7. Both ends of the main shaft 2 are supported in the pump housing 1 by first bearings 4, respectively. The main shaft 2 is coaxially arranged with the stator cavity 1-1. The outer end of the main shaft 2 extends out of the pump body and is used for connecting a power element (such as a motor). The main shaft 2 is eccentrically provided with two eccentric shaft sections 2-1 which are aligned with each other. The two eccentric shaft sections 2-1 are aligned with each other. The two ends of the inner hole of the rotor barrel 5 are concentrically supported on the two eccentric shaft sections 2-1 through second bearings 12 respectively. The sum of the radius of the rotor barrel 5 and the eccentricity of the eccentric shaft section 2-1 is equal to the radius of the stator cavity 1-1. The eccentricity of the eccentric shaft section 2-1 is the distance between the central axis of the eccentric shaft section 2-1 and the rotation axis of the main shaft 2.

Two ends of the stator cavity 1-1 are respectively provided with a diaphragm accommodating cavity 1-4. The diameter of the diaphragm housing chamber 1-4 is larger than that of the stator chamber 1-1. And mounting discs 5-1 are arranged at two ends of the rotor barrel 5. The mounting disk 5-1 is arranged coaxially with the rotor barrel 5. Two mounting discs 5-1 are respectively arranged in the two diaphragm arranging cavities 1-4. The inner side surfaces of the two mounting discs 5-1 are respectively contacted with the inner side surfaces of the two diaphragm arranging cavities 1-4. The sum of the radius of the stator cavity 1-1 and the eccentricity of the eccentric shaft section 2-1 is smaller than the radius of the mounting disc 5-1. The tops of the two mounting discs 5-1 are provided with mounting holes which are aligned with each other. The partition plate 6 is in a long strip shape, and mounting columns are arranged at two ends of the partition plate. The partition plate 6 is flat at a portion between the two mounting posts. The mounting posts at the two ends of the partition plate 6 are respectively supported in the mounting holes of the two mounting discs 5-1 through bushings. The bottom edge of the partition plate 6 is in the shape of a circular arc tangent to the outer circumferential surface of the rotor barrel 5. The circular arc central axis of the bottom edge of the partition plate 6 coincides with the axis of the mounting column.

The separation rotating shaft 7 is supported in the pump shell 1 and is positioned between the liquid inlet 1-2 and the liquid outlet 1-3 of the stator cavity 1-1. A sliding groove is arranged on one side of the side surface of the separation rotating shaft 7 close to the stator cavity. The partition plate 6 extends into the chute of the partition rotating shaft 7 and forms a sliding pair with the partition rotating shaft 7, wherein the sliding direction of the sliding pair is vertical to the rotation axis of the main shaft 2.

The liquid inlet 1-2 and the liquid outlet 1-3 of the stator cavity 1-1 are separated by the partition plate 6, so that the hydraulic medium at the liquid inlet 1-2 of the stator cavity 1-1 cannot directly flow to the liquid outlet 1-3 from the partition plate 6. When the main shaft 2 rotates, the eccentric shaft section 2-1 pushes the rotor barrel 5 to move in the stator cavity 1-1, the rotor barrel 5 is continuously contacted with different positions of the inner circumferential surface of the stator cavity 1-1, and turnover does not occur, so that the gap space of the stator cavity 1-1 is continuously changed, continuous negative pressure oil absorption of the liquid inlet 1-2 of the stator cavity 1-1 and continuous oil discharge of the liquid outlet 1-3 are realized, and the effect of pumping oil is achieved.

As shown in fig. 1 and 3, the separation film 3 has a ring shape. The side surface of the isolating membrane 3 is in a wave shape inwards and outwards. The inner side edge and the outer side edge of the isolating membrane 3 are both provided with a sealing installation ring. The sealing installation rings on the inner side edges of the two isolating membranes 3 are respectively clamped into the installation grooves on the inner side edges of the outer side surfaces of the two installation disks 5-1. The sealing installation rings on the outer edges of the two isolating membranes 3 are respectively clamped into the installation grooves in the two membrane installation cavities 1-4. The rotor barrel 5 divides the stator chamber 1-1 into an oil path region outside the rotor barrel 5 and a mechanical transmission region inside the rotor barrel 5. The two isolation membranes 3 are used for realizing sealing between the oil path area and the mechanical transmission area and realizing mutual opposition of lubricating liquid in the mechanical transmission area and hydraulic medium in the oil path area.

As shown in fig. 1 and 4, the pressure balancing assembly comprises a lubrication fluid exchange valve 8, a pressure balancing tank 10 and a pressure balancing seat 11. The pressure balance tank 10 comprises a balance tank body 10-1, a pressure balance membrane 10-2, a sliding disc 10-3, a fixing plate 10-4 and a telescopic rod 10-5. The fixing plate 10-4 is fixed in the balance tank 10-1. The top end of the telescopic rod 10-5 is fixed with the fixed plate 10-4, and the bottom end is fixed with the sliding disc 10-3. The telescopic rod 10-5 can be stretched and contracted under the axial force. The pressure balance membrane 10-2 is tubular, and the side surface is wavy. The top end of the pressure balance membrane 10-2 is fixed with the bottom surface of the fixed plate 10-4, and the bottom end is fixed with the edge of the sliding disk 10-3. The fixed plate 10-4 is provided with a circulation port. The pressure balance membrane 10-2, the sliding disc 10-3 and the fixing plate 10-4 divide the inner cavity of the balance tank body 10-1 into a first exchange cavity 10-6 and a second exchange cavity 10-7. When the telescopic rod 10-5 is stretched, the volumes of the first exchange cavity 10-6 and the second exchange cavity 10-7 are changed. A second exchange cavity 10-7 in the pressure balance tank 10 is communicated with a liquid outlet 1-3 of the stator cavity 1-1. As the pressure of the hydraulic medium output from the liquid outlet 1-3 of the stator cavity 1-1 is stable, when the volume of the second exchange cavity 10-7 in the valve housing 1 is changed, the hydraulic medium is pumped into the liquid outlet 1-3 of the stator cavity 1-1 or discharged to the liquid outlet 1-3 of the stator cavity 1-1, so that the pressure of the second exchange cavity 10-7 is kept stable, and the pressure in the first exchange cavity 10-6 is kept stable.

As shown in fig. 1 and 5, the pressure balance seat 11 is fixed to the pump housing 1. The lubricating fluid exchange valve 8 is arranged in the pressure-equalizing seat 11. One end of the inner cavity of the pressure balance seat 11 is communicated with the mechanical transmission area of the stator cavity 1-1, and the other end is communicated with the first exchange cavity in the pressure balance tank 10. The lubricating liquid exchange valve 8 comprises an exchange valve body 8-1, a first valve cover 8-2, a second valve cover 8-3, a first pre-tightening spring 8-4, a second pre-tightening spring 8-5 and a valve rod 8-6. The exchange valve body 8-1 is fixed in the pressure balance seat 11. A plurality of input exchange flow channels 8-7 and output exchange flow channels 8-8 are arranged in the exchange valve body 8-1. The valve rod 8-6 passes through the exchange valve body 8-1 and is fixed with the exchange valve body 8-1. The first valve cover 8-2 and the second valve cover 8-3 are respectively sleeved at two ends of the valve rod 8-6. Two ends of the first pre-tightening spring 8-4 respectively abut against the outer side surface of the first valve cover 8-2 and the annular bump at one end of the valve rod 8-6, so that the first valve cover 8-2 compresses the exchange valve body 8-1. Two ends of the second pre-tightening spring 8-5 respectively abut against the outer side surface of the second valve cover 8-3 and the annular bump at the other end of the valve rod 8-6, so that the second valve cover 8-3 compresses the exchange valve body 8-1. In an initial state, the first valve cover 8-2 covers one end of each input exchange flow channel 8-7; a second valve cover 8-3 covers one end of each output switching flow passage 8-8. Each of the inlet exchanger flow channels 8-7 is in direct communication with a first exchanger chamber 10-6 in a pressure equalization tank 10. Each output exchange flow channel 8-8 is directly communicated with the mechanical transmission area of the stator cavity 1-1.

When the pressure of the lubricating fluid in the input exchange flow channel 8-7 on the first valve cover 8-2 is greater than the sum of the pressure of the lubricating fluid in the mechanical transmission area of the stator cavity 1-1 on the first valve cover 8-2 and the pre-tightening force of the first pre-tightening spring 8-4 on the first valve cover 8-2, the lubricating fluid in the input exchange flow channel 8-7 props open the first valve cover 8-2, so that the lubricating fluid in the first exchange cavity 10-6 flows to the mechanical transmission area of the stator cavity 1-1. When the pressure of the lubricating liquid in the output exchange flow channel 8-8 on the second valve cover 8-3 is greater than the sum of the pressure of the lubricating liquid in the first exchange cavity 10-6 of the pressure balance tank 10 on the second valve cover 8-3 and the pre-tightening force of the second pre-tightening spring 8-5 on the second valve cover 8-3, the lubricating liquid in the output exchange flow channel 8-8 pushes the second valve cover 8-3 open, so that the lubricating liquid in the lubricating liquid flow channel 2-1 flows to the first exchange cavity 10-6 of the pressure balance tank 10. This greatly reduces pressure fluctuations within the mechanical transmission region of the stator cavity 1-1.

As shown in fig. 1 and 6, the exhaust valve 9 comprises an exhaust valve seat 9-1, an exhaust valve body 9-2, an exhaust valve core 9-3, an exhaust spring 9-4, a liquid sealing ball 9-5 and an exhaust pipe 9-9. The exhaust valve body 9-2 and the exhaust valve seat 9-1 are both fixed on the pump shell 1. The exhaust valve seat 9-1 is positioned above the exhaust valve body 9-2. An exhaust channel is arranged on the exhaust valve body 9-2. The bottom end of the exhaust channel is communicated with the mechanical transmission area of the stator cavity 1-1 in the pump shell 1.

The bottom of the exhaust channel is provided with a limit ring 9-6, and the top is provided with a spring mounting section 9-7. The exhaust valve core 9-3 is arranged in the exhaust channel and is positioned between the limiting ring and the spring mounting section 9-7. Two ends of the exhaust spring 9-4 respectively support against the exhaust valve core 9-3 and the spring mounting section 9-7. A ball body placing cavity is arranged above the spring placing section 9-7. The closed ball is placed in the ball body placing cavity. A valve core flow passage is arranged in the exhaust valve core 9-3. The valve core flow passage is communicated with the ball body arranging cavity. The air outlet pipe 9-9 is fixed in the air outlet valve seat 9-1. The bottom of the air outlet pipe 9-9 is provided with an air outlet hole 9-8. The vent hole 9-8 is aligned with a ball seating cavity in the vent valve body 9-2. The diameter of the vent hole 9-8 is smaller than that of the liquid sealing ball 9-5.

When the pressure of the lubricating liquid on the exhaust valve core 9-3 in the mechanical transmission area of the stator cavity 1-1 is larger than the pre-tightening force of the exhaust spring 9-4 on the exhaust valve core 9-3, the lubricating liquid pushes open the exhaust valve core 9-3 and is injected into the ball body accommodating cavity, so that the liquid sealing ball 9-5 floats upwards to block the exhaust hole 9-8. When gas appears in the mechanical transmission area of the stator cavity 1-1, the gas floats upwards to the ball containing cavity, the liquid sealed ball 9-5 loses the support of buoyancy and falls, and the gas in the ball containing cavity is exhausted from the exhaust hole 9-8. After which the liquid-tight ball 9-5 re-blocks the vent hole 9-8. Therefore, the exhaust valve 9 can continuously exhaust gas separated out during the use of the lubricating liquid, so that the gas is prevented from being mixed in a mechanical transmission area, and the lubricating effect is reduced.

an external power element drives the main shaft 2 to rotate, and the stator cavity starts to pump liquid. In the process of pumping liquid, the two isolating membranes 3 deform, the volume of the mechanical transmission area of the stator cavity 1-1 changes, and the pressure of lubricating liquid in the mechanical transmission area of the stator cavity 1-1 changes.

When the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity 1-1 is increased, so that the pressure of the lubricating liquid in the output exchange flow channel 8-8 on the second valve cover 8-3 is larger than the sum of the pressure of the lubricating liquid in the first exchange cavity 10-6 on the second valve cover 8-3 and the pretightening force of the second pretightening spring 8-5 on the second valve cover 8-3, the lubricating liquid in the output exchange flow channel 8-8 props against the second valve cover 8-3, so that the lubricating liquid in the mechanical transmission area of the stator cavity 1-1 flows to the first exchange cavity 10-6, and the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity 1-1 is reduced.

When the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity 1-1 is reduced, so that the pressure of the lubricating liquid in the input exchange flow channel 8-7 on the first valve cover 8-2 is greater than the sum of the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity 1-1 on the first valve cover 8-2 and the pre-tightening force of the first pre-tightening spring 8-4 on the first valve cover 8-2, the lubricating liquid in the input exchange flow channel 8-7 props the first valve cover 8-2, so that the lubricating liquid in the first exchange cavity 10-6 flows to the mechanical transmission area of the stator cavity 1-1, and the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity 1-1 is increased.

In the process that the lubricating liquid in the first exchange cavity 10-6 flows in or out, the pressure balance film 10-2 deforms under the pressure action of the hydraulic medium in the first exchange cavity 10-6 and the second exchange cavity 10-7, so that the accommodating cavity of the first exchange cavity 10-6 changes along with the inflow or outflow of the lubricating liquid, and the stability of the pressure of the lubricating liquid in the first exchange cavity 10-6 is kept. As the second exchange cavity 10-7 is connected with the liquid outlet 1-3 of the stator cavity 1-1, hydraulic medium can be introduced or discharged when the volume of the second exchange cavity 10-7 is changed, and the pressure in the second exchange cavity is kept stable.

Claims

1. An internal and external balance non-leakage diaphragm pressurized fluid device comprises a pump shell (1), a pump fluid assembly and an isolating membrane (3); the method is characterized in that: the device also comprises a pressure balancing component; a stator cavity (1-1) is arranged in the pump shell (1); a liquid inlet (1-2) and a liquid outlet (1-3) are arranged on the stator cavity (1-1); the liquid pumping assembly comprises a main shaft (2), a rotor cylinder (5), a partition plate (6) and a partition rotating shaft (7); the main shaft (2) is supported in the pump shell (1); the main shaft (2) and the stator cavity (1-1) are coaxially arranged; an eccentric shaft section (2-1) is eccentrically arranged on the main shaft (2); the rotor barrel (5) is supported on the eccentric shaft section (2-1); the rotor cylinder (5) divides the stator cavity (1-1) into an oil path area outside the rotor cylinder (5) and a mechanical transmission area inside the rotor cylinder (5);

the separation rotating shaft (7) is supported in the pump shell (1) and is positioned between the liquid inlet (1-2) and the liquid outlet (1-3) of the stator cavity (1-1); the partition plate (6) and the partition rotating shaft (7) form a sliding pair; the partition plate (6) and the rotor cylinder (5) form a revolute pair; the isolation film (3) is annular; the inner side edges of the two isolating membranes (3) are respectively fixed with two ends of the rotor barrel (5), and the outer side edges of the two isolating membranes are respectively fixed with two ends of the stator cavity;

the pressure balance assembly comprises a lubricating liquid exchange valve (8), a pressure balance tank (10) and a pressure balance seat (11); the pressure balance tank (10) comprises a balance tank body (10-1) and a pressure balance membrane (10-2); the pressure balance membrane (10-2) is arranged in the balance tank body (10-1) and divides the inner cavity of the balance tank body (10-1) into a first exchange cavity (10-6) and a second exchange cavity (10-7); the second exchange cavity (10-7) is communicated with a liquid outlet (1-3) of the stator cavity (1-1);

the pressure balance seat (11) is fixed with the pump shell (1); the lubricating liquid exchange valve (8) is arranged in the pressure balance seat (11); one end of the inner cavity of the pressure balance seat (11) is communicated with the mechanical transmission area of the stator cavity (1-1), and the other end is communicated with the first exchange cavity in the pressure balance tank (10); the lubricating liquid exchange valve (8) comprises an exchange valve body (8-1), a first valve cover (8-2), a second valve cover (8-3), a first pre-tightening spring (8-4) and a second pre-tightening spring (8-5); an input exchange flow passage (8-7) and an output exchange flow passage (8-8) are arranged in the exchange valve body (8-1); the first valve cover (8-2) is propped against one end of the exchange valve body (8-1) through a first pre-tightening spring (8-4); the second valve cover (8-3) is propped against the other end of the exchange valve body (8-1) through a first pre-tightening spring (8-4); the first valve cover (8-2) covers one end of the input exchange flow passage (8-7); the second valve cover (8-3) covers one end of the output exchange flow passage (8-8).

2. The internally and externally balanced leak-free diaphragm pressurized fluid device of claim 1, wherein: two ends of the stator cavity (1-1) are provided with diaphragm accommodating cavities (1-4); the diameter of the diaphragm placing cavity (1-4) is larger than that of the stator cavity (1-1); mounting discs (5-1) are arranged at two ends of the rotor barrel (5); the mounting disc (5-1) and the rotor cylinder (5) are coaxially arranged; the two mounting discs (5-1) are respectively arranged in the two diaphragm arranging cavities (1-4); the inner side surfaces of the two mounting discs (5-1) are respectively contacted with the inner side surfaces of the two diaphragm arranging cavities (1-4); the sum of the radius of the stator cavity (1-1) and the eccentricity of the eccentric shaft section (2-1) is less than the radius of the mounting disc (5-1); mounting holes are formed in the tops of the two mounting discs (5-1); the partition plate (6) is in a long strip shape; two ends of the partition plate (6) are respectively supported on the two mounting discs (5-1); the bottom edge of the partition plate (6) is in a circular arc shape tangent to the outer circumferential surface of the rotor cylinder (5); the circular arc central axis of the bottom edge of the partition plate (6) is superposed with the axis of the mounting column; a sliding groove is formed in one side face of the separation rotating shaft (7) close to the stator cavity; the partition plate (6) extends into the chute of the partition rotating shaft (7) and forms a sliding pair with the partition rotating shaft (7) and the sliding direction of the sliding pair is vertical to the rotation axis of the main shaft (2); the inner side edge and the outer side edge of the isolating film (3) are provided with sealing mounting rings; the sealing mounting rings on the inner side edges of the two isolating membranes (3) are respectively clamped into the mounting grooves on the inner side edges of the outer sides of the two mounting discs (5-1); the sealing installation rings on the outer edges of the two isolating membranes (3) are respectively clamped into the installation grooves in the two membrane accommodating cavities (1-4).

3. The internally and externally balanced leak-free diaphragm pressurized fluid device of claim 1, wherein: also comprises an exhaust valve (9); the exhaust valve (9) comprises an exhaust valve seat (9-1), an exhaust valve body (9-2), an exhaust valve core (9-3), an exhaust spring (9-4), a liquid sealing ball (9-5) and an exhaust pipe (9-9); the exhaust valve body (9-2) and the exhaust valve seat (9-1) are both fixed on the pump shell (1); the exhaust valve seat (9-1) is positioned above the exhaust valve body (9-2); an exhaust channel is arranged on the exhaust valve body (9-2); the bottom end of the exhaust channel is communicated with a mechanical transmission area of a stator cavity (1-1) in the pump shell (1); the bottom of the exhaust channel is provided with a limit ring (9-6), and the top is provided with a spring mounting section (9-7); the exhaust valve core (9-3) is arranged in the exhaust channel and is positioned between the limiting ring and the spring mounting section (9-7); two ends of the exhaust spring (9-4) respectively support against the exhaust valve core (9-3) and the spring mounting section (9-7); a ball body mounting cavity is arranged above the spring mounting section (9-7); the closed ball is placed in the ball body placing cavity; a valve core flow passage is arranged in the exhaust valve core (9-3); the valve core flow passage is communicated with the ball body arranging cavity; the air outlet pipe (9-9) is fixed in the air outlet valve seat (9-1); the bottom of the air outlet pipe (9-9) is provided with an air outlet hole (9-8); the exhaust hole (9-8) is aligned with a sphere mounting cavity in the exhaust valve body (9-2); the diameter of the vent hole (9-8) is smaller than that of the liquid sealing ball (9-5).

4. The internally and externally balanced leak-free diaphragm pressurized fluid device of claim 1, wherein: the pressure balance tank (10) also comprises a sliding disc (10-3), a fixed plate (10-4) and a telescopic rod (10-5); the fixed plate (10-4) is fixed in the balance tank body (10-1); the top end of the telescopic rod (10-5) is fixed with the fixed plate (10-4), and the bottom end of the telescopic rod is fixed with the sliding disc (10-3); the pressure balance membrane (10-2) is tubular; the top end of the pressure balance membrane (10-2) is fixed with the bottom surface of the fixed plate (10-4), and the bottom end is fixed with the edge of the sliding disc (10-3); the fixed plate (10-4) is provided with a circulation port.

5. The internally and externally balanced leak-free diaphragm pressurized fluid device of claim 1, wherein: the lubricating liquid exchange valve (8) also comprises a valve rod (8-6); the valve rod (8-6) penetrates through the exchange valve body (8-1) and is fixed with the exchange valve body (8-1); the first valve cover (8-2) and the second valve cover (8-3) are respectively sleeved at two ends of the valve rod (8-6); two ends of the first pre-tightening spring (8-4) respectively abut against the outer side surface of the first valve cover (8-2) and the annular bump at one end of the valve rod (8-6), so that the first valve cover (8-2) compresses the exchange valve body (8-1); two ends of the second pre-tightening spring (8-5) respectively abut against the outer side surface of the second valve cover (8-3) and the annular convex block at the other end of the valve rod (8-6).

6. The internally and externally balanced leak-free diaphragm pressurized fluid device of claim 1, wherein: the sum of the radius of the rotor barrel (5) and the eccentricity of the eccentric shaft section (2-1) is equal to the radius of the stator cavity (1-1).

7. The internally and externally balanced leak-free diaphragm pressurized fluid device of claim 1, wherein: the side surface of the isolation membrane (3) is in a wave shape from inside to outside.

8. A method of pressure balancing an internally and externally balanced leak-free diaphragm pressurized fluid device as claimed in claim 1, wherein: the main shaft (2) rotates, and the stator cavity starts to pump liquid; in the process of pumping liquid, the two isolating membranes (3) deform, the volume of the mechanical transmission area of the stator cavity (1-1) changes, and the pressure of lubricating liquid in the mechanical transmission area of the stator cavity (1-1) changes;

when the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is increased, so that the pressure of the lubricating liquid in the output exchange flow channel (8-8) on the second valve cover (8-3) is greater than the sum of the pressure of the lubricating liquid in the first exchange cavity (10-6) on the second valve cover (8-3) and the pre-tightening force of the second pre-tightening spring (8-5) on the second valve cover (8-3), the lubricating liquid in the output exchange flow channel (8-8) props open the second valve cover (8-3), so that the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) flows to the first exchange cavity (10-6), and the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is reduced;

when the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is reduced, so that the pressure of the lubricating liquid in the input exchange flow channel (8-7) on the first valve cover (8-2) is greater than the sum of the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) on the first valve cover (8-2) and the pre-tightening force of the first pre-tightening spring (8-4) on the first valve cover (8-2), the lubricating liquid in the input exchange flow channel (8-7) props open the first valve cover (8-2), so that the lubricating liquid in the first exchange cavity (10-6) flows to the mechanical transmission area of the stator cavity (1-1), and the pressure of the lubricating liquid in the mechanical transmission area of the stator cavity (1-1) is improved;