CN111981150A

CN111981150A - Pressure controller

Info

Publication number: CN111981150A
Application number: CN202010907016.6A
Authority: CN
Inventors: 蒋小平
Original assignee: Shanghai Qiyu Mechanical And Electrical Equipment Co ltd
Current assignee: Shanghai Qiyu Mechanical And Electrical Equipment Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2020-11-24

Abstract

The invention aims to provide a pressure controller capable of adjusting fuel pressure in a negative zone of a venturi tube, which comprises a mounting disc used for connecting a pump oil pipe, wherein the venturi tube penetrates through a central hole formed in the middle of the mounting disc and forms axial limit fit, an inner cavity of the venturi tube forms a main fuel passage, the narrowest position of the main fuel passage forms the negative zone of the venturi tube, a through hole penetrating through a disc surface is formed in the disc surface of the mounting disc positioned in the pump oil pipe, and an adjusting unit is used for adjusting the fuel pressure in the negative zone of the venturi tube by adjusting the cross sectional area of the through hole. For a venturi, the flow rate increases, the pressure decreases, the flow rate decreases, and the pressure increases in the negative zone. In the scheme, the fuel flow flowing through the through hole is changed by adjusting the cross sectional area of the through hole, and the flow flowing through the main fuel passage is indirectly changed, so that the fuel pressure at the fuel inlet of the aircraft fuel tank is always equal to the fuel pressure at the negative zone of the venturi tube, and the purpose of controlling the fuel pressure at the fuel inlet of the aircraft fuel tank is realized.

Description

Pressure controller

Technical Field

The invention relates to the technical field of aviation refueling equipment, in particular to a pressure controller for an aircraft refueling truck.

Background

The aircraft refueling truck is the most widely used refueling equipment for large and medium-sized airports, and plays a great role in guaranteeing the refueling of the aircraft. When an airplane is refueled, rapid, safe and large-flow refueling is required, so that the working pressure of a fuel pumping system of an airplane refueling truck is expected to be as large as possible, but the pressure value which can be borne by an airplane fuel tank and an internal fuel supply system of the airplane fuel tank is certain, and the damage to the airplane fuel tank and the internal fuel supply system can be caused by overhigh pressure, so that the airplane refueling truck is required to be provided with a pressure control system to automatically control the pressure of fuel at the inlet of the airplane fuel tank so that the pressure does not exceed an allowable value.

The pressure control principle of the aircraft refueling truck is shown in figure 1, a pressure loop consisting of a venturi tube 2 and a pressure control valve 1 is arranged in a refueling system, when the aircraft is refueled, fuel is injected into an aircraft fuel tank 4 through a refueling rubber tube 3, a fuel pressure signal is directly collected from the tail end of the refueling rubber tube 3, namely a fuel inlet of the aircraft fuel tank 4, and then the signal is fed back to the pressure control valve 1 to control the pressure, so that the venturi tube 2 is arranged in the fuel pumping system. The venturi 2 is also called as a venturi tube, the cross section of the venturi tube is narrowed, the effects of increasing the flow rate and reducing the pressure are achieved, the narrowest cross section of the venturi tube is generally called as a venturi tube negative area, and the diameter of the venturi tube negative area is determined through calculation, so that the fuel pressure at the fuel inlet of the fuel tank is always equal to the fuel pressure at the negative area of the venturi tube 2, and the fuel pressure at the fuel inlet of the fuel tank can be simulated by using the fuel pressure at the negative area of the venturi tube 2. The negative zone interface of the venturi 2 is connected with the hydraulic control interface A of the pressure control valve 1, so that the opening and closing of the pressure control valve 1 can be controlled by the fuel pressure of the negative zone of the venturi 2, namely the fuel pressure at the fuel inlet of the fuel tank. When an airplane is refueled, when the fuel pressure at a fuel inlet of a fuel tank is smaller than an allowable value, and the sum of the negative area pressure of the venturi tube 2 and the pressure of the balance spring is smaller than the pneumatic control pressure (the pneumatic control pressure value is the sum of the allowable value of the fuel pressure of the fuel tank of the airplane and the pressure of the balance spring), the pressure control valve 1 is in an opening position, fuel can pass through the pressure control valve 1, and the fuel pumping system is in a refueling state; on the contrary, when the pressure at the fuel inlet of the oil tank of the aircraft is higher than the allowable value, the sum of the pressure of the negative region of the venturi 2 and the pressure of the balance spring is larger than the pneumatic control pressure, the pressure control valve 1 is closed, the fuel can not pass through the pressure control valve 1, and the oil pumping system stops oil filling, so that the automatic control of the pressure is realized.

Disclosure of Invention

The invention aims to provide a pressure controller capable of adjusting fuel pressure in a negative region of a venturi.

In order to achieve the purpose, the invention adopts the technical scheme that: a pressure controller comprises a mounting disc used for being connected with a pump oil pipe, a venturi tube penetrates through a center hole formed in the middle of the mounting disc and forms axial limiting fit, an inner cavity of the venturi tube forms a fuel main passage, the narrowest position of the fuel main passage forms a venturi tube negative area, a through hole penetrating through a disc surface is formed in the disc surface of the mounting disc positioned in the pump oil pipe, and an adjusting unit adjusts the cross-sectional area of the through hole and is used for adjusting the fuel pressure of the venturi tube negative area.

In the scheme, for the venturi, the flow velocity of the negative zone is increased, the pressure is reduced, the flow velocity is reduced, and the pressure is increased. Therefore, the flow of fuel oil flowing through the through hole is changed by adjusting the size of the cross section area of the through hole, and the flow of fuel oil flowing through the main fuel oil passage is indirectly changed, so that the fuel oil pressure at the fuel oil inlet of the aircraft fuel tank is always equal to the fuel oil pressure at the negative zone of the venturi tube, and the purpose of controlling the fuel oil pressure at the fuel oil inlet of the aircraft fuel tank is achieved.

Drawings

FIG. 1 is a pressure control schematic of an aircraft fuelling vehicle;

FIG. 2 is a schematic diagram of the overall structure of the pressure controller;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a schematic view of the pressure controller with the fuel assist passage B fully closed;

FIG. 5 is a schematic view of the pressure controller with the auxiliary fuel passage B half-open;

FIG. 6 is a schematic view of the pressure controller fuel auxiliary passage B in a fully open state;

FIG. 7 is a cross-sectional view of FIG. 2;

FIG. 8 is a schematic view of the overall structure of the pressure controller with the second passage;

FIG. 9 is a schematic view of the fuel auxiliary passage B of FIG. 8 in a fully open state;

fig. 10 is a cross-sectional view of fig. 8.

Detailed Description

The present invention is discussed in further detail below in conjunction with fig. 2-7.

A pressure controller comprises a mounting disc 10 used for being connected with a pump oil pipe, a venturi tube 20 penetrates through a center hole 11 formed in the middle of the mounting disc 10 and forms axial limiting fit, an inner cavity of the venturi tube 20 forms a fuel main passage A, the narrowest position of the fuel main passage A forms a venturi tube negative area, a through hole 12 penetrating through the disc surface is formed in the disc surface of the mounting disc 10 located inside the pump oil pipe, and an adjusting unit adjusts the cross sectional area of the through hole 12 and is used for adjusting the fuel pressure of the venturi tube 20 negative area.

It should be noted that the oil pumping pipe (not shown in the figures) is connected to the two sides of the disk surface of the mounting disk 10, that is, the venturi 20 is located in the oil pumping pipe and belongs to the pipe-in-pipe, a majority of the fuel passing through the oil pumping pipe passes through the fuel main passage a formed by the inner cavity of the venturi 20, and the other part of the fuel passes through the through hole 12 formed in the disk surface of the mounting disk 10 (provided that the through hole 12 allows the fuel to pass through under the adjustment of the adjusting unit, if the adjusting unit adjusts the through hole 12 to be closed, the fuel passing through the oil pumping pipe passes through the fuel main passage a formed by the inner cavity of the venturi 20), for the venturi, the flow rate of the negative region is increased, the pressure is decreased, the flow rate is decreased, the pressure is increased, the flow rate of the fuel passing through the through hole 12 is changed by adjusting the size of the cross-sectional area of the through hole 12, the flow rate passing through the fuel main passage a is indirectly changed, thereby realizing the purpose of controlling the fuel pressure at the fuel inlet of the aircraft fuel tank.

As a preferable scheme of the invention, the adjusting unit comprises an adjusting disc 30, an annular concave part 13 is arranged on the disc surface of the oil inlet side of the mounting disc 10, the through hole 12 is arranged at the concave bottom position of the annular concave part 13, the adjusting disc 30 is embedded in the annular concave part 13, a round hole 31 corresponding to the through hole 12 is arranged on the adjusting disc 30, the adjusting disc 30 is driven by power to rotate to change the overlapping area of the round hole 31 and the through hole 12, and the communicating area of the round hole 31 and the through hole 12 forms a fuel auxiliary passage B. The position of the round hole 31 on the adjusting disc 30 is changed by rotating the adjusting disc, so that the overlapping area of the round hole 31 and the through hole 12 is correspondingly changed, when the round hole 31 and the through hole 12 are completely dislocated, as shown in fig. 4, namely the fuel auxiliary passage B is closed, fuel cannot pass through the fuel auxiliary passage B, and all fuel passes through the fuel main passage A; when the circular hole 31 and the through hole 12 partially coincide, as shown in fig. 5, that is, the fuel auxiliary passage B is partially opened, a part of the fuel passes through the fuel auxiliary passage B, and the other part of the fuel passes through the main fuel passage a; when the circular hole 31 and the through hole 12 are completely overlapped, as shown in fig. 6, that is, the auxiliary fuel passage B is completely opened, a part of the fuel passes through the auxiliary fuel passage B, and another part of the fuel passes through the main fuel passage a, compared with fig. 5, the fuel flowing through the main fuel passage a has a smaller fuel flow rate, a smaller flow rate, and a larger fuel pressure in the negative region of the venturi tube 20. That is, when the fuel auxiliary passage B is changed from small to large, the fuel pressure in the negative region of the venturi 20 gradually rises; on the contrary, when the fuel auxiliary passage B is changed from big to small, the fuel pressure in the negative area of the venturi tube 20 is gradually reduced; therefore, the fuel pressure in the negative area of the venturi tube 20 is adjusted, and the purpose of controlling the fuel pressure at the fuel inlet of the aircraft fuel tank is achieved.

Further, the annular concave portion 13 is arranged outside the central hole 11, and the annular concave portion 13 and the central hole are arranged concentrically, and the disk surfaces on two sides of the adjusting disk 30 are respectively abutted against the concave bottom of the annular concave portion 13 and the steps arranged on the outer wall of the venturi tube 20 to form axial limit fit. The position of the adjusting disk 30 in the axial direction is limited, and only rotation can be performed, so that the disk surface of the adjusting disk 30 is ensured to be attached to the concave bottom of the annular concave part 13.

In order to ensure that the fuel uniformly flows through the outside of the venturi tube 20, the through holes 12 and the hole cores of the circular holes 31 are arranged in parallel with the tube core of the venturi tube 20, the diameter of the circular hole 31 is equal to that of the through hole 12, the through holes 12 are uniformly arranged at intervals in the circumferential direction at the concave bottom of the annular concave part 13, the circular holes 31 are correspondingly arranged on the adjusting disc 30, and the fuel passing through the outside of the fuel main passage a is uniformly distributed to the downstream through the fuel auxiliary passage B formed by the through holes 12 and the circular holes 31 in the circumferential direction.

Furthermore, a guide pin 32 is convexly arranged on the disc surface of the adjusting disc 30 towards the concave bottom of the annular concave part 13, the guide pin 32 is inserted into an arc-shaped guide groove 14 formed on the concave bottom of the annular concave part 13 to form guide sliding fit, and the curvature center of the arc-shaped guide groove 14 is collinear with the disc core of the adjusting disc 30. Due to the guiding effect of the arc-shaped guide groove 14, the adjusting disc 30 rotates around the disc core of the adjusting disc 30 all the time, so that the adjusting disc 30 is prevented from offsetting, and the hole cores of the through hole 12 and the circular hole 31 are ensured to be positioned on the same cylindrical surface.

In order to improve the working efficiency, when the guide pin 32 is at the two ends of the arc-shaped guide groove 14 (i.e. when the fuel auxiliary passage B is in the fully open state and the fully closed state), the angle between the center of the guide pin 32 and the connecting line of the disc core of the adjusting disc 30 is α, the angle between the tangents at the two sides of the minimum aperture position of the circular hole 31 of the disc core of the adjusting disc 30 (because the hole shape of the circular hole 31 is the same as the diameter-variable shape of the contracted pipe section 22) is β, and α is β. That is, when the guide pin 32 is located at one end position of the arc-shaped guide groove 14, the fuel auxiliary passage B is in a fully closed state, and when the guide pin 32 is rotated to the other end position of the arc-shaped guide groove 14, the fuel auxiliary passage B is in a fully open state, which can prevent the rotation angle of the adjustment disk 30 from being too large to affect the next adjustment.

The mounting disc 10 is provided with an adjusting hole 15, the bolt assembly 40 is inserted into the adjusting hole 15 from the outside of the mounting disc 10 and abuts against the adjusting disc 30, the adjusting disc 30 is pushed to rotate by rotating the bolt assembly 40, if the length direction and the abutting position of the adjusting hole 15 are collinear with the connecting line of the disc core of the mounting disc 10, the adjusting disc 30 cannot rotate, so that the length direction and the abutting position of the adjusting hole 15 are arranged in an included angle mode with the connecting line of the disc core of the mounting disc 10, and the bolt assembly 40 is pushed to push the adjusting disc 30 to rotate in place and then be locked.

The concrete structure is that the bolt component 40 comprises a guide bolt 41 fixedly arranged in the adjusting hole 15, the guide bolt 41 is of a hollow structure, an adjusting screw 42 is connected with the inner thread of the hollow inner cavity, the inner end part of the adjusting screw 42 is abutted against a guide post 43, the guide pin 32 is clamped between the two guide posts 43, the adjusting hole 15 comprises a threaded hole section corresponding to the guide bolt 41 and an unthreaded hole section corresponding to the guide post 43, the aperture of the threaded hole section is matched with the outer diameter of the guide bolt 41, the aperture of the unthreaded hole section is matched with the outer diameter of the guide post 43 to play a role in guiding, the guide post 43 is ensured to do linear motion, the mounting disc 10 is provided with a missing part 16 for accommodating the bolt head of the guide bolt 41, the end part of the hollow inner cavity of the guide bolt 41 is provided with a dustproof cover 44, in order to prevent impurities from entering the hollow cavity of the guide bolt 41 and affecting the rotation of the adjusting screw 42, a dust cover 44 is arranged at the end of the hollow cavity. When the venturi tube sealing device works, firstly the dustproof cover is removed, the adjusting screw 42 on one side is loosened, the adjusting screw 42 on the other side is rotated to push the guide post 43 on the side to move, the thrust of the guide post 43 pushes the guide pin 32 to rotate along the arc-shaped guide groove 14, namely the adjusting disc 30 rotates, so that the working pressure of the negative region of the venturi tube is equal to the required working pressure, the other adjusting screw 42 is balanced and locked, and finally the dustproof cover 44 is covered.

Normally, the venturi 20 includes a diverging pipe section 21 and a converging pipe section 22, the converging pipe section 22 is disposed adjacent to the oil inlet side, the diverging pipe section 21 is disposed adjacent to the oil outlet side, the diameters of the small diameter ends of the diverging pipe section 21 and the converging pipe section 22 are equal and are disposed adjacently, a gap 23 is left between the two small diameter ends, and the two small diameter ends and the gap 23 together form a venturi negative region. The term "diffusion" and "contraction" as used herein means that the diameter of the venturi tube gradually increases or decreases along the fuel flow direction, that is, the diameter of the contraction pipe section 22 gradually decreases on the fuel inlet side, and the diameter of the diffusion pipe section 21 gradually increases on the fuel outlet side, and the small diameter ends of the diffusion pipe section 21 and the contraction pipe section 22 are not fixedly connected, but have a gap 23 therebetween for collecting the fuel pressure in the negative region of the venturi tube. The hole pattern of the round hole 31 of the adjusting disc 30 is in a reducing shape same as the pipe type of the contraction pipe section 22, the hole pattern of the through hole 12 of the mounting disc 10 is in a reducing shape same as the pipe type of the diffusion pipe section 21, and the inner diameter of the small-diameter end of the round hole 31 is equal to the inner diameter of the small-diameter end of the through hole 12. The fuel auxiliary passage B formed by the through hole 12 and the circular hole 31 also functions as a venturi, and the resistance loss of the fuel auxiliary passage B is reduced.

Furthermore, an annular groove 111 is formed in the inner wall of the central hole 11 of the mounting disc 10, the diffusion pipe section 21 and the contraction pipe section 22 are inserted from two sides of the central hole 11, external threads of the outer walls of the diffusion pipe section 21 and the contraction pipe section 22 are in threaded connection with internal threads of the central hole 11, steps of the outer walls of the diffusion pipe section 21 and the contraction pipe section 22 are abutted against two end portions of the central hole 11 to form axial limiting fit, a pressure collection area of a venturi negative area is located in the annular groove 111, a first channel 17 communicated with the annular groove 111 is radially formed in the outer wall of the mounting disc 10, and the outer end of the first channel 17 is connected with a. When the pressure control valve is installed, the diffusion pipe section 21 and the contraction pipe section 22 are screwed in from two sides of the central hole 11 respectively until steps on the outer walls of the diffusion pipe section 21 and the contraction pipe section 22 are abutted to two end parts of the central hole 11 to be installed in place, the pressure collecting area of the negative area of the venturi pipe is located in the annular groove 111, the pressure control valve is communicated with the annular groove 111 through the first channel 17, namely is communicated with the negative area of the venturi pipe, and the fuel pressure of the negative area of the venturi pipe directly controls the on-off of the pressure control valve, so that the automatic control of.

In order to connect with the pump oil pipe, a mounting hole 18 for connecting the pump oil pipe is formed in the disc surface of the mounting disc 10 on the periphery of the mounting disc 10 along the circumferential direction, an annular groove is further formed in the disc surface of the mounting disc 10 between the mounting hole 18 and the annular concave portion 13, and a sealing ring 50 is arranged in the annular groove. The inner diameter of the pump oil pipe is larger than the diameter of the circumscribed circle of the round holes 31 distributed on the adjusting disc 30 and the diameter of the circumscribed circle of the through holes 12 distributed on the mounting disc 10, so that the round holes 31 and the through holes 12 are exposed on the fuel flow path in the pump oil pipe, the end of the pump oil pipe is provided with a mounting flange, the mounting flange is attached to the disc surface of the mounting disc 10, the mounting holes in the mounting flange and the mounting hole 18 in the disc surface of the mounting disc 10 are fixedly connected through bolts, in order to prevent fuel leakage, a sealing ring 50 is further arranged, and the sealing ring 50 is attached to the mounting flange of the pump oil pipe in a leaning.

Because the fuel pressure in the pump oil pipe also needs to be collected, if a collection port is directly formed in the pump oil pipe, the original structure of the pump oil pipe needs to be damaged, and the problems of sealing and the like need to be solved at the same time, therefore, a second channel 19 is further arranged on the mounting disc 10, the second channel 19 comprises a radial channel 191 radially formed in the outer wall of the mounting disc 10, an axial channel 192 is formed in the inner end of the radial channel 191 in a bending and extending mode, an outlet a of the axial channel 192 is arranged at the concave bottom position of the annular concave portion 13, a part of disc surface of the adjusting disc 30 is cut off at the position corresponding to the outlet a of the axial channel 192 to form an avoiding portion 33, the outlet a is exposed outside the adjusting disc 30, and the outer end of the radial channel 191 is connected. Therefore, a fuel pressure collecting port of the pump oil pipe is also arranged on the pressure controller, the structure of the pump oil pipe is not required to be changed, the specific method is that a pipe joint connected with the pressure control valve is arranged on the outer disc surface of the mounting disc 10, the outlet a of the second channel 19 is exposed outside the adjusting disc 30, and the fuel pressure in the pump oil pipe is obtained by collecting the fuel pressure at the outlet a (which is called as a venturi tube positive area in the industry) for flow control and pressure balance.

Further, the escape portion 33 is disposed away from the guide pin 32, that is, the outlet a is in an escape position relative to the arc-shaped guide groove 14.

Claims

1. A pressure controller, characterized by: the fuel pump comprises a mounting disc (10) used for being connected with a pump oil pipe, a venturi (20) penetrates through a center hole (11) formed in the middle of the mounting disc (10) and forms axial limiting fit, an inner cavity of the venturi (20) forms a fuel main passage A, the narrowest position of the fuel main passage A forms a venturi negative zone, a through hole (12) penetrating through the disc surface is formed in the disc surface of the mounting disc (10) positioned inside the pump oil pipe, and the adjusting unit is used for adjusting the cross sectional area of the through hole (12) and adjusting the fuel pressure of the venturi (20) negative zone.

2. The pressure controller of claim 1, wherein: the adjusting unit comprises an adjusting disc (30), an annular concave portion (13) is arranged on the disc surface of the oil inlet side of the mounting disc (10), a through hole (12) is formed in the concave bottom position of the annular concave portion (13), the adjusting disc (30) is embedded in the annular concave portion (13), a round hole (31) corresponding to the through hole (12) is formed in the adjusting disc (30), the adjusting disc (30) is driven by power to rotate to change the overlapping area of the round hole (31) and the through hole (12), and the round hole (31) and the through hole (12) are communicated with each other to form a fuel auxiliary passage B.

3. The pressure controller of claim 2, wherein: the annular concave part (13) is arranged outside the central hole (11) and arranged concentrically, and the disc surfaces on the two sides of the adjusting disc (30) are respectively abutted against the concave bottom of the annular concave part (13) and the steps arranged on the outer wall of the venturi tube (20) to form axial limit fit.

4. The pressure controller of claim 2, wherein: the through holes (12) and the hole cores of the round holes (31) are arranged in parallel with the tube core of the venturi tube (20), the diameter of the round holes (31) is equal to that of the through holes (12), the through holes (12) are uniformly arranged at the bottom of the annular concave part (13) along the circumferential direction at intervals, and the round holes (31) are correspondingly arranged on the adjusting disc (30).

5. The pressure controller of claim 3, wherein: the disc surface of the adjusting disc (30) is convexly provided with a guide pin (32) towards the concave bottom of the annular concave part (13), the guide pin (32) is inserted into an arc-shaped guide groove (14) formed in the concave bottom of the annular concave part (13) to form guide sliding fit, and the curvature center of the arc-shaped guide groove (14) is collinear with the disc core of the adjusting disc (30).

6. The pressure controller of claim 5, wherein: when the guide pin (32) is arranged at the two ends of the arc-shaped guide groove (14), the included angle between the center of the guide pin (32) and the connecting line of the disc core of the adjusting disc (30) is alpha, the included angle between the tangents at the two sides of the minimum aperture of the round hole (31) of the disc core of the adjusting disc (30) is beta, and alpha is beta.

7. The pressure controller of claim 5, wherein: the adjusting hole (15) has been seted up on mounting disc (10), bolt assembly (40) insert adjusting hole (15) and support with adjusting disc (30) from mounting disc (10) outside and lean on, the length direction of adjusting hole (15) with support to locate and mounting disc (10) core line and be the contained angle formula and arrange, bolt assembly (40) promote adjusting disc (30) rotate the back of targetting in place and lock.

8. The pressure controller of claim 7, wherein: bolt assembly (40) including fixed guide bolt (41) of setting in regulation hole (15), guide bolt (41) have adjusting screw (42) for threaded connection in hollow structure and the hollow inner chamber, the inner end tip and guide post (43) of adjusting screw (42) offset, position department between two guide post (43) is held in uide pin (32), regulation hole (15) are including the unthreaded hole section that corresponds with guide bolt (41) and the unthreaded hole section that corresponds with guide post (43), unthreaded hole section aperture coincide with guide bolt (41) external diameter, unthreaded hole section aperture coincide with guide post (43) external diameter, offer on mounting disc (10) and be used for holding missing portion (16) of guide bolt (41) bolt head, the hollow inner chamber tip of guide bolt (41) is provided with shield (44).

9. The pressure controller of claim 1, wherein: the venturi (20) comprises a diffusion pipe section (21) and a contraction pipe section (22), the contraction pipe section (22) is arranged close to the oil inlet side, the diffusion pipe section (21) is arranged close to the oil outlet side, the diameters of the small-diameter ends of the diffusion pipe section (21) and the contraction pipe section (22) are equal and are arranged close to each other, a gap (23) is reserved between the two small-diameter ends, and the two small-diameter ends and the gap (23) jointly form a venturi negative area.

10. The pressure controller of claim 9, wherein: the hole pattern of the round hole (31) of the adjusting disc (30) is in a reducing shape the same as the pipe type of the contraction pipe section (22), and the hole pattern of the through hole (12) of the mounting disc (10) is in a reducing shape the same as the pipe type of the diffusion pipe section (21).

11. The pressure controller of claim 10, wherein: the inner diameter of the small-diameter end of the round hole (31) is equal to the inner diameter of the small-diameter end of the through hole (12).

12. The pressure controller of claim 1, wherein: annular grooves (111) are formed in the inner wall of a center hole (11) of the mounting disc (10), the diffusion pipe section (21) and the contraction pipe section (22) are inserted from two sides of the center hole (11), external threads of the outer walls of the diffusion pipe section (21) and the contraction pipe section (22) are in threaded connection with internal threads of the center hole (11), steps of the outer walls of the diffusion pipe section (21) and the contraction pipe section (22) are abutted against two end portions of the center hole (11) to form axial limiting fit, a pressure collecting area of a venturi negative area is located in the annular grooves (111), a first channel (17) communicated with the annular grooves (111) is radially formed in the mounting disc (10) from the outer wall, and the outer end of the first channel (17) is connected with a.

13. The pressure controller of claim 3, wherein: the mounting disc (10) is provided with a mounting hole (18) along the circumferential direction for connecting a pump oil pipe, an annular groove is further formed in the disc surface of the mounting disc (10) between the mounting hole (18) and the annular concave portion (13), and a sealing ring (50) is arranged in the annular groove.

14. The pressure controller according to any one of claims 1 to 13, wherein: still be provided with second passageway (19) on mounting disc (10), second passageway (19) include radial passageway (191) radially seted up from mounting disc (10) outer wall, the inner end of radial passageway (191) is buckled and is extended axial passageway (192), the export (a) of axial passageway (192) set up in the depressed center position department of annular concave part (13), the department that corresponds export (a) of adjusting disk (30) and axial passageway (192) cuts off partial quotation and constitutes dodge portion (33), export (a) expose in adjusting disk (30) outside, the outer end of radial passageway (191) is connected with the coupling that meets with the pressure control valve.

15. The pressure controller of claim 14, wherein: the escape portion (33) is disposed away from the guide pin (32).