CN214794217U

CN214794217U - Water pressure adjusting mechanism capable of being preset remotely

Info

Publication number: CN214794217U
Application number: CN202121189464.3U
Authority: CN
Inventors: 马增新; 武文豪; 樊宏政
Original assignee: Shanxi Mutual Rise Technology Co ltd
Current assignee: Shanxi Mutual Rise Technology Co ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-11-19
Anticipated expiration: 2031-05-31

Abstract

The utility model relates to a can long-rangely predetermine water pressure adjustment mechanism. The utility model comprises a pressure relief valve connected with a hydraulic press, a proportional pressure reducing valve and an electromagnetic directional valve connected with the pressure relief valve, wherein the hydraulic press is provided with a fixed end and a movable end, a tested steel pipe is arranged between the fixed end and the movable end, the pressure relief valve comprises a valve seat, a valve body and a valve core, control cylinder, valve body inner chamber front end sealing connection sets up the disk seat, valve body inner chamber rear end sealing connection sets up control cylinder, the valve body inner chamber sets up the pressure release mouth, the disk seat end sets up round hole as the pressure chamber of accessing the mouth and connecting the stiff end, the case excircle be the circular cone type and with the coaxial adaptation of the hole of disk seat, control cylinder connects the drive valve core and stretches out and draws back in the hole that the disk seat end set up, adjust the aperture between access mouth and the valve body inner chamber, the pressure chamber of stiff end is still connected and is set up high-pressure water supply mouth, the manometer, pressure sensor, different pipe diameter steel pipe pressure releases have been realized, water pressure can long-rangely predetermine, simplified equipment debugging procedure and debug time.

Description

Water pressure adjusting mechanism capable of being preset remotely

Technical Field

The utility model belongs to the technical field of hydrostatic test machine, specifically a can long-rangely predetermine water pressure adjustment mechanism.

Background

The hydrostatic testing machine is a device which is used for bearing a certain pressure inside a steel pipe by filling low-pressure water and refilling high-pressure water, testing the pressure resistance of the steel pipe and eliminating the internal stress of the steel pipe. At present, various pressure regulating methods of the hydraulic press have relative limitations, and a better control method used is a PID (proportion integration differentiation) regulating method, so that a pressing test can be carried out according to different test pressure requirements. However, in the practical use process, it is found that for different pipe diameters, especially when the pipe diameter difference is large, the PID parameters need to be adjusted in different sections, and the adjustment of the PID parameters needs to be adjusted by a professional. Make the indefinite extension of actual debugging process, because the steel pipe that can not have all pipe diameters can be tested when trying production, can only follow the production task and debug the parameter. A universal pressure regulating mechanism is needed to meet the pressure test of various pipe diameters.

Disclosure of Invention

The utility model discloses a solve the reliable pressure regulating problem of hydrostatic testing machine when experimental different pipe diameters are accurate, invent one kind and can long-rangely predetermine hydraulic pressure adjustment mechanism.

The utility model adopts the following technical proposal:

the utility model provides a can long-rangely predetermine water pressure adjustment mechanism, including the relief valve of connecting the hydraulic press, still including the proportion relief pressure valve and the electromagnetic directional valve of connecting the relief valve, the hydraulic press sets up the stiff end and removes the end, set up the tried steel pipe between stiff end and the removal end, the relief valve includes the disk seat, a valve body, the case, the control jar, valve body inner chamber front end sealing connection sets up the disk seat, valve body inner chamber rear end sealing connection sets up the control jar, the valve body inner chamber sets up the pressure release mouth, the disk seat end sets up round hole as the access mouth, it is flexible in the hole that the disk seat end set up to control jar piston rod connection and drive the valve core, adjust the aperture between access mouth and the valve body inner chamber, the pressure chamber of stiff end is connected to the access mouth, the pressure chamber of stiff end is still connected and is set up high-pressure supply opening.

The connecting ports of the control cylinder and the valve seat are coaxial, the excircle of the valve core is conical, and the conical shape of the valve core is coaxially matched with the inner hole of the valve seat.

The pressure cavity of the fixed end is also respectively connected with a pressure gauge and a pressure sensor.

The control cylinder is of a double-acting structure, a rodless cavity of the control cylinder is connected with an inlet of the proportional pressure reducing valve, a rod cavity of the control cylinder is connected with a port B of the electromagnetic directional valve, the electromagnetic directional valve is a two-position four-way valve, a port P is connected with control oil pressure, and a port T returns oil.

The control cylinder is of a single-action structure, the inner cavity of the control cylinder is connected with an inlet of the proportional pressure reducing valve, the electromagnetic directional valve is a two-position three-way valve, a port P is connected with control oil pressure, the inner cavity of the control cylinder is connected with a port B of the electromagnetic directional valve, and a port T returns oil.

In the prior art, the pressure of a high-pressure water pump safety valve is adjusted by an original manual pressure adjusting mode, namely, the pressure is set as a steel pipe test pressure, an overflow valve is opened after the pressure exceeds the pressure, the pressure adjusting mode needs to be adjusted frequently for different pressures, the use process is complicated, especially when steel pipe mixed pipes of different specifications pass through lines, the pressure is different, the adjustment is needed once when one steel pipe is pressed, and the adjusted parameters are not necessarily accurate. The other type uses PID control to adjust parameters, theoretically can realize required pressure debugging, and can find that the parameters are different aiming at different pipe diameter intervals in the actual use process. Like this can make the debugging time prolong greatly, because the steel pipe that can not have each pipe diameter debugs when debugging equipment, need follow the production task and go on, the debugging of PID parameter needs comparatively professional technical staff to debug in addition. And the water pressure value needs to be preset in advance and then is directly used during pressure testing, rather than adjusting the overflow valve to overflow and reduce the pressure after the pressure is equalized. When the mixed pipe passes through the wire, the pressure values required by all pipe diameters are different, so the pressure values need to be replaced according to the pipe diameters,

the utility model overcomes the defects, realizes safe overflow pressure relief, and can remotely preset the water pressure value; the debugging program and the debugging time of the equipment can be simplified; the adaptability to steel pipes with different pipe diameters is more reliable.

Drawings

FIG. 1 is a schematic view of the regulating circuit and the connection of the present invention;

fig. 2 is a schematic diagram of a plunger pressure regulating structure according to a second embodiment of the present invention.

The device comprises a fixed end 1, a movable end 2, a tested steel pipe 3, a high-pressure water supply port 4, a pressure gauge 5, a pressure sensor 6, a valve body 7, a valve seat 8, a valve core 9, an inlet 10, a pressure relief port 11, a control cylinder 12, a proportional pressure reducing valve 13 and an electromagnetic reversing valve 14.

Detailed Description

As shown in figure 1-2, a water pressure regulating mechanism capable of being preset remotely comprises a pressure relief valve connected with a hydraulic press, a proportional pressure reducing valve 13 connected with the pressure relief valve and an electromagnetic directional valve 14, wherein the hydraulic press is provided with a fixed end 1 and a movable end 2, a steel pipe 3 to be tested is arranged between the fixed end 1 and the movable end 2, the pressure relief valve comprises a valve seat 8, a valve body 7, a valve core 9 and a control cylinder 12, the front end of the inner cavity of the valve body 7 is hermetically connected with the valve seat 8, the rear end of the inner cavity of the valve body 7 is hermetically connected with the control cylinder 12, the inner cavity of the valve body 7 is provided with a pressure relief port 11, the valve seat end is provided with a circular inner hole as an access port 10, the access ports of the control cylinder 12 and the valve seat 8 are coaxial, the control cylinder 12 is connected with a driving valve core 9 for extension and retraction, the outer circle of the valve core 9 is conical, the conical shape of the valve core 9 is coaxially matched with the inner hole of the valve seat 7, the valve core 9 is used for extension and throttling regulation of pressure relief and on-off between the inner cavity of the valve body 7, the pressure chamber of the fixed end 1 is connected with the inlet 10 of the valve seat 7, and the pressure chamber of the fixed end 1 is also respectively connected with a high-pressure water supply port 4, a pressure gauge 5 and a pressure sensor 6.

As shown in figure 1, the control cylinder 12 is of a double-acting structure, a rodless cavity is provided with a K1 port, a rod cavity is provided with a K2 port, K1 is connected with an inlet of the proportional reducing valve 13, the electromagnetic directional valve 14 is a two-position four-way valve, a P port is connected with control oil pressure, a K1 port is connected with an A port of the electromagnetic directional valve, a K2 port is connected with a B port of the electromagnetic directional valve, and a T port returns oil.

As shown in fig. 2, the control cylinder 12 is a single-acting structure, the cylinder cavity is provided with a K3 port, a K3 is connected with an inlet of the proportional pressure reducing valve 13, the electromagnetic directional valve 14 is a two-position three-way valve, a P port is connected with control oil pressure, a K3 is connected with a B port of the electromagnetic directional valve, and a T port returns oil.

The hole shaft of the control cylinder 12 is sealed by copper-based alloy, so that the frictional resistance of the oil cylinder is reduced.

The working mode is as follows:

the high-pressure water supply port 4 is connected with a pressure medium which can be seawater, fresh water, high-water base liquid and the like.

In the first embodiment, as shown in fig. 1, a port P of an electromagnetic directional valve 14 is connected with control oil, the control oil enters a port K1 through a port a, pressure of a rodless cavity of a control cylinder 12 is established, a valve core 9 and an inner hole of a valve seat 8 are in a contact sealing state, a high-pressure water supply port 4 is filled into a fixed end 1 to press a test steel pipe, so that water pressure is kept at a set pressure value, a proportional pressure reducing valve 13 can set pressure and pressure reduction rate according to test requirements and pressure media, a required oil pressure value is obtained according to water pressure calculation according to the comparison of the sectional area of a piston of the control cylinder 12 and the sectional area of an opening of the valve core 9, the required thrust of the valve core 9 can be guaranteed by inputting a hydraulic pressure value to the proportional pressure reducing valve 13, a safe pressure high value can be preset by the proportional pressure reducing valve 13, the valve core 9 is pushed to move backwards after the hydraulic pressure exceeds the preset pressure value, and the valve core 9 is separated from the valve seat 8, and then the hydraulic pressure is unloaded; when the water pressure is released to be below the safety pressure through the proportional pressure reducing valve 13, the electromagnetic directional valve 14 can be reversed, the port P is communicated with the port K2, the control cylinder 12 drives the valve core 9 to retract, rapid unloading and pressure relief can be realized, the water pressure is released through the pressure relief port 11, the pressure detection data feedback control system of the pressure sensor 6 controls the proportional pressure reducing valve 13 to prevent overpressure, and the data of the pressure gauge 5 is used for reading in real time.

In the second embodiment, as shown in fig. 2, control oil is introduced into a port P of the electromagnetic directional valve 14, the control oil enters a port K3 through a port B, pressure of a rodless cavity of the control cylinder 12 is established, the valve element 9 and an inner hole of the valve seat 8 are in a contact sealing state, the high-pressure water supply port 4 is filled into the fixed end 1 to press the test steel pipe, so that the water pressure is kept at a set pressure value, the proportional pressure reducing valve 13 can set pressure and pressure reduction rate according to test requirements and pressure media, a required oil pressure value is obtained according to calculation of the water pressure according to the cross section area of a piston of the control cylinder 12 compared with the cross section area of an opening of the valve element 9, the required thrust of the valve element can be guaranteed by inputting the hydraulic pressure value into the proportional pressure reducing valve 13, a safe pressure high value can be preset by the proportional pressure reducing valve, the valve element 9 is pushed to move backwards after the hydraulic pressure exceeds the preset pressure value, and the valve element 9 is separated from the valve seat 8, and then the hydraulic pressure is unloaded; the water pressure is released through the proportional pressure reducing valve 13, the water pressure is released through the pressure relief opening 11, the pressure detection data feedback control system of the pressure sensor 6 controls the proportional pressure reducing valve 13 to prevent overpressure, and the data of the pressure gauge 5 is used for reading in real time.

The proportional pressure reducing valve 13, the electromagnetic directional valve 14 and the control cylinder 12 in the two embodiments are connected through longer pipelines, remote control connection can be achieved, safety is higher, only one remote control pipeline is arranged in the second embodiment, a control loop is simplified, structural sealing friction of the plunger cylinder is smaller, and control accuracy is more sensitive.

Claims

1. The utility model provides a can long-rangely predetermine water pressure adjustment mechanism, is including the relief valve of connecting the hydraulic press, its characterized in that: the hydraulic press is characterized by further comprising a proportional pressure reducing valve (13) and an electromagnetic directional valve (14), wherein the proportional pressure reducing valve (13) is connected with the pressure release valve, the hydraulic press is provided with a fixed end (1) and a movable end (2), a tested steel pipe is arranged between the fixed end (1) and the movable end (2), the pressure release valve comprises a valve seat (8), a valve body (7), a valve core (9) and a control cylinder (12), the front end of the inner cavity of the valve body (7) is hermetically connected with the valve seat (8), the rear end of the inner cavity of the valve body (7) is hermetically connected with the control cylinder (12), the inner cavity of the valve body (7) is provided with a pressure relief opening (11), the valve seat end is provided with a circular inner hole as an access opening (10), the piston rod of the control cylinder (12) is connected with the valve core (9) and stretches out and draws back in the inner hole arranged at the valve seat end, the opening between the access opening (10) and the inner cavity of the valve body (7) is adjusted, the pressure cavity of the fixed end (1) is connected with the access opening (10), the pressure cavity of the fixed end (1) is also connected with a high-pressure water supply port (4).

2. A remotely presettable hydraulic pressure adjustment mechanism as claimed in claim 1, wherein: the control cylinder (12) and the valve seat (8) are coaxially connected, the outer circle of the valve core (9) is conical, and the conical shape of the valve core (9) is coaxially matched with the inner hole of the valve seat.

3. A remotely presettable hydraulic pressure adjustment mechanism as claimed in claim 1, wherein: the pressure cavity of the fixed end (1) is also respectively connected with a pressure gauge (5) and a pressure sensor (6).

4. A remotely presettable hydraulic pressure adjustment mechanism as claimed in any one of claims 1-3, wherein: the control cylinder (12) is a double-acting structure, the rodless cavity of the control cylinder (12) is connected with an inlet of a proportional pressure reducing valve (13), the rod cavity of the control cylinder (12) is connected with a port B of an electromagnetic directional valve, the electromagnetic directional valve (14) is a two-position four-way valve, a port P is connected with a control oil pressure, and a port T returns oil.

5. A remotely presettable hydraulic pressure adjustment mechanism as claimed in any one of claims 1-3, wherein: the control jar (12) are the single-action structure, proportional relief pressure valve (13) entry is connected to the jar inner chamber of control jar (12), solenoid directional valve (14) are two three-way valves, and P mouthful access control oil pressure, the jar inner chamber of control jar (12) is connected solenoid directional valve B mouth, T mouthful oil return.