CN204142485U - A kind of lifting valve port attribute testing platform - Google Patents

Abstract

The utility model discloses a test bench for characteristics of a lift valve port, which comprises a front cover, a plexiglass cylinder and a rear cover. During the period, the valve core test piece penetrates the back cover, and its front end communicates with the valve seat test piece to form a throttle valve port, and the rear end is connected with the tension pressure sensor, which is also connected with the adjusting bolt fixed on the connecting bracket. An induction plate corresponding to the displacement sensor is fixed on the spool test piece. The lift valve port characteristic test bench disclosed by the utility model can realize the flow field visualization valve port characteristic test in the range of 0-16MPa through the observation of the transparent plexiglass cylinder; Preparation time; by setting the induction metal plate, the material and processing accuracy requirements of the measured surface can be guaranteed, the measurement accuracy of the eddy current displacement sensor can be improved, and the dynamic and accurate measurement of the valve core movement can be realized.

Description

A poppet valve port characteristics test bench

technical field

The utility model relates to the field of valve port characteristic test equipment, in particular to a test bench for the characteristic of a lift valve port in the field.

Background technique

Most of the existing test devices for valve port characteristics cannot be visualized. Even if a small part of the test is visualized, the pressure is usually lower than 5MPa and cannot reach a higher pressure value, which limits the pressure range of the valve port characteristic test. Specifically, the existing valve port characteristic tests are generally divided into two types: visualization and non-visualization. Since computer simulation cannot accurately reflect the real flow field state, the existing flow field visualization test scheme is generally carried out by using transparent shell materials. Observe directly. In the existing technology, the commonly used valve port visualization flow field test generally uses transparent plastic or polymer materials as the valve shell to realize the visualization of the valve port flow field. However, due to the strength of transparent materials, it is generally difficult to withstand the pressure of 16Mpa, and most of the tests are concentrated in the low pressure range.

At present, the domestic water pressure control valve valve port characteristic test is generally a complete prototype test, that is, the whole machine is tested after all the processing and manufacturing of the prototype is completed. Generally, a prototype can only be used for a valve port of one size or one structural form. Characteristic test. That is to say, the existing valve port characteristic test bench generally can only test the characteristics of one valve port, and if other valve ports are to be tested, the corresponding valve body and other parts must be reprocessed. Even if the commonality of the test piece is realized in a small range, the replacement process is quite cumbersome and the test period is very long.

Utility model content

The technical problem to be solved by the utility model is to provide a lift valve port characteristic test bench which is easy to replace the test pieces and can realize serial tests.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A test bench for characteristics of a poppet valve port, the improvement of which is that the test bench includes a front cover, a plexiglass cylinder and a rear cover connected together, and the front cover provided with a water inlet joint is fixed on the front cover by end cover bolts, The valve seat test piece is installed between the front cover and the plexiglass cylinder, the valve core test piece penetrates into the back cover, its front end communicates with the valve seat test piece to form a throttle port, the rear end is connected with the pull pressure sensor, and the pull pressure sensor It is also connected with the adjusting bolt fixed on the connecting bracket, the spool test piece is sealed with the back cover with a gray ring, and an induction plate corresponding to the displacement sensor is also fixed on the spool test piece.

In a preferred embodiment, a sliding bearing is also provided at the position corresponding to the test piece of the valve core inside the back cover.

In a preferred embodiment, the gray ring is fixed on the rear cover through a gray ring cover.

In a preferred embodiment, an inlet pressure regulating overflow valve and an inlet pressure sensor are installed on the water inlet joint.

In a preferred embodiment, the test bench is also provided with an outlet throttle valve, an outlet pressure regulating overflow valve, and an outlet pressure sensor.

In a preferred embodiment, the test piece of the valve core is connected to the tension pressure sensor through mutually matched threads.

In a preferred embodiment, the induction plate is a metal plate, and the displacement sensor is an eddy current displacement sensor.

In a preferred embodiment, the connecting bracket is fixed on the upper surface of the servo linear slide table, and the servo linear slide table is driven by the ball screw driven by the AC servo motor, and its displacement can be controlled by the servo motor controller, or can be Its displacement is controlled by adjusting the hand wheel.

The beneficial effects of the utility model are:

The lift valve port characteristic test bench disclosed by the utility model uses a transparent plexiglass cylinder as the observation object, and can realize the flow field visualization valve port characteristic test in the range of 0-16MPa; the design of the test device is reasonable, and only the key The valve seat test piece and the valve core test piece can realize serial tests and reduce the cost; the structural design of the test bench simplifies the operation of replacing the test piece and shortens the test preparation time; by setting the induction metal plate, the material of the tested surface can be guaranteed And processing accuracy requirements, improve the measurement accuracy of the eddy current displacement sensor, and realize the dynamic and accurate measurement of the valve core movement.

Description of drawings

Fig. 1 is a schematic structural view of a poppet valve port characteristic test bench disclosed by the utility model.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Embodiment 1, as shown in Figure 1, this embodiment discloses a poppet valve port characteristics test bench, which includes a front cover 4, a plexiglass cylinder 6 and a rear cover 7 connected together, and a water inlet joint 3 is provided The front end cover 2 is fixed on the front cover 4 through the end cover bolt 1, the valve seat test piece 5 is installed between the front cover 4 and the plexiglass cylinder 6, the valve core test piece 15 penetrates the back cover 7, and its front end and the valve seat The test piece 5 communicates to form a throttle valve port 16, the rear end is connected with the tension pressure sensor 13, the tension pressure sensor is also connected with the adjusting bolt 12 fixed on the connecting bracket 11, the valve core test piece 15 is connected with the rear cover 7 in a grid The lap ring is sealed, and an induction plate 9 corresponding to the displacement sensor 10 is also fixed on the spool test piece 15 .

A sliding bearing 8 is also arranged at the position corresponding to the valve core test piece inside the back cover.

The gray ring is fixed on the back cover through the gray ring cover 14 .

An inlet pressure regulating overflow valve and an inlet pressure sensor are also installed on the water inlet joint.

An outlet throttle valve, an outlet pressure regulating overflow valve, and an outlet pressure sensor are also arranged on the test bench.

The spool test piece and the tension pressure sensor are connected through mutually matched threads.

The induction plate is a metal plate, and the displacement sensor 10 is an eddy current displacement sensor. The plexiglass cylinder is a transparent PMMA material, through which the internal throttling valve port can be directly observed.

The connecting bracket is fixed on the upper table of the servo linear slide table. The servo linear slide table is driven by the ball screw driven by the AC servo motor, and its displacement can be controlled by the servo motor controller or by adjusting the handwheel. .

In this embodiment, the main function of the eddy current displacement sensor is to perform real-time measurement of the opening of the poppet valve and its motion. Before the test, the poppet valve port is completely closed, and the opening of the valve port at this time is set to zero. At this time, the eddy current displacement sensor measures a distance value and displays a corresponding value in the signal test software. By adjusting the eddy current displacement The sensor is installed with a thread to adjust it to a reasonable integer value. For example, the measurement range of the eddy current displacement sensor used in this test device is 0-6mm, and the opening of the valve port is about 0-2mm. When the zero position can be set by adjusting the sensor position The sensor display value is 5mm, and the difference between 5mm and the sensor display value is the valve opening.

The main function of the tension pressure sensor is to measure the hydraulic pressure and hydraulic force on the valve core test piece. The two ends of the tension pressure sensor are processed with internal threads, and the two ends are respectively connected with the external thread of the valve core test piece and the adjusting bolt. The force of the spool test piece is transmitted to the tension pressure sensor. Since the spool test piece in this experimental device protrudes out of the experimental device, a sealing ring must be provided. This experimental device uses a gray ring for sealing. Due to the friction of the sealing ring, the measured value of the tension pressure sensor is not To determine the actual force of the parts, it is necessary to test the frictional resistance of the sealing ring before the experiment, and to remove the corresponding value of the frictional force in the experimental data.

The poppet valve port characteristic test bench disclosed in this embodiment uses a transparent plexiglass cylinder as the observation object, and can realize the flow field visualization valve port characteristic test in the range of 0-16MPa; the design of the test device is reasonable, and only the key The valve seat test piece and the valve core test piece can realize serial tests and reduce the cost; the structural design of the test bench simplifies the operation of replacing the test piece and shortens the test preparation time; by setting the induction metal plate, the material of the tested surface can be guaranteed And processing accuracy requirements, improve the measurement accuracy of the eddy current displacement sensor, and realize the dynamic and accurate measurement of the valve core movement.

Claims (8)

1. one kind promotes valve port attribute testing platform, it is characterized in that: this testing table comprises the protecgulum linked together, organic glass cylinder and bonnet, the front end end cover arranging water supply connector is fixed on protecgulum by bolt of cover, valve seat test specimen is installed between protecgulum and organic glass cylinder, spool test specimen penetrates bonnet, its front end communicates with valve seat test specimen formation throttle orifice, rear end is connected with pull pressure sensor, pull pressure sensor is also connected with the adjusting bolt be fixed in connection bracket, spool test specimen and bonnet seal with Glais ring, and on spool test specimen, be also fixed with one piece of tablet corresponding with displacement transducer.

2. lifting valve port attribute testing platform according to claim 1, is characterized in that: be also provided with sliding bearing at the inner position corresponding with spool test specimen of bonnet.

3. lifting valve port attribute testing platform according to claim 1, is characterized in that: described Glais ring is fixed on bonnet by Glais ring gland.

4. lifting valve port attribute testing platform according to claim 1, is characterized in that: water supply connector is also provided with inlet pressure regulation relief valve, inlet pressure transducer.

5. lifting valve port attribute testing platform according to claim 1, is characterized in that: described testing table is also arranged speed control muffler, top hole pressure regulation relief valve, outlet pressure sensor.

6. lifting valve port attribute testing platform according to claim 1, is characterized in that: spool test specimen with between pull pressure sensor by being threaded of cooperatively interacting.

7. lifting valve port attribute testing platform according to claim 1, it is characterized in that: described tablet is sheet metal, described displacement transducer is eddy current displacement sensor.

8. lifting valve port attribute testing platform according to claim 1, it is characterized in that: described connection bracket is fixed on the upper table surface of servo straight line slide unit, servo straight line slide unit drives ball-screw-transmission by AC servomotor, both can control its displacement by controller for servomotor, also control its displacement by control hand wheel.