Energy accumulator pre-filled nitrogen pressure on-line detection device

Abstract

The utility model relates to the technical field of electro-hydraulic control, in particular to an energy accumulator pre-charging nitrogen pressure on-line detection device which comprises a conveying pipe and energy accumulators, a processing assembly used for sequentially detecting the energy accumulators is arranged outside the conveying pipe, the processing assembly comprises a supporting frame and a connector which are arranged on the top of the conveying pipe, and the supporting frame is connected with the connector. An annular groove is formed in the supporting frame, a positioning hole is formed in the annular groove, a hole groove is formed in the top of the connector, an insertion pipe is arranged in the hole groove, protruding blocks are arranged on the two sides of the outer wall of the insertion pipe, a sealing ring is arranged on the outer wall of the insertion pipe, and a mounting frame is arranged in the supporting frame. And a locking groove and a threaded layer are arranged on the inner wall of the mounting frame. According to the utility model, potential safety hazards can be timely eliminated in advance; sufficient nitrogen is guaranteed in real time, the abrasion speed of the power pump can be slowed down, and the service life of a hydraulic element is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electro-hydraulic control, in particular to an accumulator pre-charged nitrogen pressure online detection device. Background Art

[0002] Accumulators for electro-hydraulic actuators convert fluid power into mechanical motion and are commonly used to control the movement of large machinery or equipment. They consist of an electronic control system and a hydraulic system, enabling precise control of the movement of hydraulic cylinders. Currently, gas-filled accumulators are the most commonly used in electro-hydraulic actuator systems, serving as an "emergency power source." Therefore, periodic monitoring of the accumulator's pre-charged nitrogen pressure is crucial during regular maintenance, whether in single-unit or dual-unit hydraulic systems.

[0003] However, the existing technology currently suffers from large repeatability errors when testing accumulators, and damage to the corresponding shut-off valves in high-pressure systems is unavoidable. Furthermore, although specialized tools are relatively accurate, some gas is missed with each test, significantly impacting smaller accumulators. Utility Model Content

[0004] The purpose of the utility model is to provide an online detection device for the pre-charged nitrogen pressure of an accumulator to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An accumulator pre-charged nitrogen pressure online detection device includes a delivery pipe and an accumulator, a processing component for sequentially detecting the accumulator is provided on the outside of the delivery pipe, the processing component includes a support frame and a connector arranged on the top of the delivery pipe, an annular groove is provided inside the support frame, a positioning hole is provided inside the annular groove, a hole groove is provided on the top of the connector, a cannula is provided inside the hole groove, protrusions are provided on both sides of the outer wall of the cannula, a sealing ring is provided on the outer wall of the cannula, a mounting frame is provided inside the support frame, and a lock groove and a threaded layer are provided on the inner wall of the mounting frame.

[0007] As a preferred solution of the present invention, the connector is connected to the delivery pipe through a sleeve, the top of the connector is connected to the bottom of the support frame through bolts, and the hole groove of the connector corresponds to the positioning hole.

[0008] As a preferred solution of the present invention, the annular groove is distributed in an annular shape in the support frame and is connected to the positioning hole. Multiple mounting frames can be placed inside the annular groove, and the multiple mounting frames are all annularly arranged in the annular groove and slidably connected to the inner wall of the annular groove through a slide rail.

[0009] As a preferred solution of the present invention, the cannula is slidably connected to the internal hole groove of the connector, the hole groove is communicated with the delivery pipe, the protrusion is inclined and integrally formed with the outer wall of the cannula, and the sealing ring is inlaid and connected to the outer wall of the cannula.

[0010] As a preferred solution of the present invention, the insert tube can extend from the positioning hole and extend into the annular groove, and can be embedded in the bottom of the mounting bracket at the positioning hole. The locking groove is arc-shaped and the protrusion is slidably connected to the locking groove on the inner wall of the mounting bracket.

[0011] As a preferred solution of the present invention, an accumulator is provided on the top of the mounting frame, and the bottom connecting end of the accumulator is rotatably connected to the inner wall of the mounting frame through a thread.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: in response to the problems raised in the background art, the present application adopts a processing assembly, by distributing multiple accumulators to be inspected in a circular manner in a support frame, and connecting them to pipelines in sequence through circular movement of the mounting frame for inspection, thereby realizing pipeline inspection of the accumulators and improving inspection efficiency;

[0013] The pre-charged nitrogen pressure of the electro-hydraulic actuator accumulator is detected online in real time. No matter adding, reducing or replacing the accumulator group, the parameter value is set in advance before the equipment is put into operation. It can automatically match the working mode of the equipment power pump to provide accurate nitrogen detection value in real time and issue an alarm, so as to predict and eliminate safety hazards in time. Ensuring sufficient nitrogen in real time can not only slow down the wear rate of the power pump, but also greatly increase the service life of the hydraulic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional diagram of the overall structure of the utility model;

[0015] Figure 2 This is a structural diagram of the connector of the utility model;

[0016] Figure 3 This is an internal cross-sectional view of the mounting bracket of the utility model.

[0017] In the figure: 1. delivery pipe; 2. support frame; 201. annular groove; 3. positioning hole; 4. connector; 401. hole groove; 5. insert; 501. bump; 502. sealing ring; 6. mounting frame; 601. locking groove; 602. threaded layer; 7. accumulator. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Example

[0019] See also Figure 1-3The utility model provides a technical solution: an accumulator pre-charged nitrogen pressure online detection device, comprising a delivery pipe 1 and an accumulator 7, wherein the delivery pipe 1 is provided with a processing component for sequentially detecting the accumulator 7, and the processing component comprises a support frame 2 and a connector 4 arranged on the top of the delivery pipe 1, a plurality of mounting frames 6 can be placed inside the support frame 2 to carry a plurality of accumulators 7, and a plurality of accumulators 7 can be loaded at the same time for sequential delivery and detection. The support frame 2 is provided with an annular groove 201 inside, and the annular groove 201 is communicated with the positioning hole 3. During operation, the mounting frame 6 slides in the annular groove 201 to the positioning hole 3 area for easy connection with the pipeline. The annular groove 201 is provided with a positioning hole 3, and the positioning hole 3 can communicate the pipeline connection structure with the mounting frame 6 loaded with the accumulator 7, and the top of the connector 4 is provided with a hole groove 401, which can accommodate the cannula 5 in the normal state, and the cannula 5 is arranged inside the hole groove 401. When the plug 5 is inserted into the mounting bracket 6, the protrusion 501 can be extended into the locking groove 601 of the mounting bracket 6, and the plug 5 is rotated to match the arc structure of the protrusion 501 and the locking groove 601 to tighten and lock it into the mounting bracket 6. At the same time, the bottom of the mounting bracket 6 abuts against the sealing ring 502 to achieve a sealing effect. The outer wall of the plug 5 is provided with a sealing ring 502, and the supporting frame 2 is provided with a mounting bracket 6. The inner wall of the mounting bracket 6 is provided with a locking groove 601 and a threaded layer 602. The threaded layer 602 facilitates the rotational connection between the mounting bracket 6 and the accumulator 7. During operation, multiple mounting brackets 6 are sequentially slid into the positioning hole 3 and connected to the pipeline to realize the inspection of the accumulator 7. During the inspection, the accumulator 7 after inspection can be removed and replaced, realizing a streamlined inspection operation and improving the efficiency of the inspection.

[0020] In this embodiment, all electrical components are controlled by conventional controllers.

[0021] For example, please refer to Figure 1-3, the connector 4 is connected to the delivery pipe 1 through a sleeve, the top of the connector 4 is connected to the bottom of the support frame 2 by a bolt, the hole groove 401 of the connector 4 corresponds to the positioning hole 3, the annular groove 201 is annularly distributed in the support frame 2 and communicates with the positioning hole 3, a plurality of mounting brackets 6 can be placed inside the annular groove 201, and the plurality of mounting brackets 6 are respectively annular in the annular groove 201 and are slidably connected to the inner wall of the annular groove 201 through a slide rail, the cannula 5 is slidably connected to the hole groove 401 inside the connector 4, the hole groove 4 01 is connected to the delivery pipe 1, the protrusion 501 is at an inclined angle and is integrally formed with the outer wall of the cannula 5, the sealing ring 502 is inlaid and connected with the outer wall of the cannula 5, the cannula 5 can extend from the positioning hole 3 and extend into the annular groove 201, and can be embedded in the bottom of the mounting bracket 6 located at the positioning hole 3, the locking groove 601 is arc-shaped and the protrusion 501 is slidably connected to the locking groove 601 on the inner wall of the mounting bracket 6, and an accumulator 7 is provided on the top of the mounting bracket 6, and the bottom connecting end of the accumulator 7 is connected to the inner wall of the mounting bracket 6 through a threaded rotation.

[0022] By utilizing the relationship between the gas pressure and the volume of the hydraulic oil in the accumulator, a dynamic equation is used to detect and calculate the pressure of the pre-charged nitrogen gas in the accumulator group in real time; Equation overview: PV=nRT;

[0023] P represents the pressure of the gas (Pascal, Pa)

[0024] V represents the volume of the gas (cubic meters, m³)

[0025] n represents the amount of gas (mole, mol)

[0026] R represents the ideal gas constant (8.314 J / (mol·K))

[0027] T is the absolute temperature of the gas (Kelvin, K)

[0028] The volume of hydraulic oil in the accumulator is ΔV=[Vo*(1-(P1 / P2)1 / n)] / (P1 / Po)1 / n (liters);

[0029] Po represents the nitrogen charging pressure of the accumulator

[0030] Vo represents the nominal volume of the accumulator (liters)

[0031] P1 represents the upper limit of accumulator pressure compensation

[0032] P2 represents the lower limit of accumulator pressure compensation

[0033] n represents the exponent. For isothermal process, n=1; for adiabatic process, n=1.4

[0034] For a "dynamic" system like an electro-hydraulic actuator, the state of the gas will change over time, so the time factor also needs to be considered; the nitrogen pressure value Po is calculated using the boost time of the power pump group, which is the time it takes to detect the energy storage in the accumulator;

[0035] t=(ΔV+V) / [(S / 1000)*n*η]*60(seconds) where

[0036] S is the oil pump displacement (cc / r)

[0037] n is the motor speed (r / min)

[0038] η is the volumetric efficiency of the oil pump

[0039] V is the fuel consumption during regulation

[0040] Related factors that cause errors during calculation:

[0041] (1) The temperature of the nitrogen itself increases;

[0042] (2) Change in hydraulic oil volume during valve position adjustment;

[0043] (3) Leakage of oil pump and hydraulic system;

[0044] (4) Errors caused by indirect measurement of P1 and P2;

[0045] After repeated verification with a large amount of experimental data, the accuracy of the solution has been guaranteed. The electro-hydraulic actuator control system uses pre-set indicator parameters. After each storage or release process of the accumulator, the controller immediately calculates the current nitrogen pressure value of the system through dynamic equation calculations and compares and judges it with the alarm value set in the system. At the same time, it uses dry contacts or remote communication to transmit alarm information, thereby improving the reliability and safety of system operation online.

[0046] The working process of the present utility model is as follows: when in use, multiple accumulators 7 are first rotated and installed on the mounting frame 6, and then the mounting frame 6 is rotated and moved to the positioning hole 3 in the annular groove 201 through the PLC controller, and at the same time, the cannula 5 is controlled to extend from the connector 4 and pass through the positioning hole 3 and embed into the specified position in the mounting frame 6 in the positioning hole 3 area, and the protrusion 501 on the outer wall of the cannula 5 extends into the locking groove 601, and the cannula 5 can be moved in the locking groove 601 with the rotation of the cannula 5 and the inclined angle is matched to make the cannula 5 retract into the mounting frame 6, so that the pipeline is connected with the accumulator 7 for detection.

[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An accumulator pre-charged nitrogen pressure online detection device, comprising a delivery pipe (1) and an accumulator (7), wherein a processing component for sequentially detecting the accumulator (7) is provided on the outside of the delivery pipe (1), and is characterized in that: The processing assembly comprises a support frame (2) and a connector (4) arranged on the top of the delivery pipe (1); an annular groove (201) is arranged inside the support frame (2); a positioning hole (3) is arranged inside the annular groove (201); a hole groove (401) is arranged on the top of the connector (4); a cannula (5) is arranged inside the hole groove (401); protrusions (501) are arranged on both sides of the outer wall of the cannula (5); a sealing ring (502) is arranged on the outer wall of the cannula (5); a mounting frame (6) is arranged inside the support frame (2); a locking groove (601) and a threaded layer (602) are arranged on the inner wall of the mounting frame (6).

2. The accumulator pre-charge nitrogen pressure online detection device according to claim 1, characterized in that: The connector (4) is connected to the delivery pipe (1) via a sleeve, the top of the connector (4) is connected to the bottom of the support frame (2) via bolts, and the hole groove (401) of the connector (4) corresponds to the positioning hole (3).

3. The accumulator pre-charge nitrogen pressure online detection device according to claim 1, characterized in that: The annular groove (201) is distributed in an annular shape within the support frame (2) and communicates with the positioning hole (3). A plurality of mounting frames (6) can be placed inside the annular groove (201), and the plurality of mounting frames (6) are all annularly located within the annular groove (201) and are slidably connected to the inner wall of the annular groove (201) via a slide rail.

4. The accumulator pre-charge nitrogen pressure online detection device according to claim 1, characterized in that: The cannula (5) is slidably connected to the internal hole groove (401) of the connector (4), the hole groove (401) is communicated with the delivery pipe (1), the protrusion (501) is inclined and is integrally formed with the outer wall of the cannula (5), and the sealing ring (502) is inlaid and connected to the outer wall of the cannula (5).

5. The accumulator pre-charge nitrogen pressure online detection device according to claim 1, characterized in that: The insert (5) can extend from the positioning hole (3) and into the annular groove (201), and can be embedded in the bottom of the mounting frame (6) located at the positioning hole (3). The locking groove (601) is arc-shaped and the protrusion (501) is slidably connected to the locking groove (601) on the inner wall of the mounting frame (6).

6. The accumulator pre-charge nitrogen pressure online detection device according to claim 1, characterized in that: An accumulator (7) is provided on the top of the mounting frame (6), and a bottom connection end of the accumulator (7) is rotatably connected to the inner wall of the mounting frame (6) via a thread.

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