CN203070667U - Teaching demonstration device for valve adjusting characteristics - Google Patents

Abstract

The utility model discloses a teaching demonstration device for valve adjusting characteristics in the technical field of hydromechanical measuring equipment design. The teaching demonstration device comprises a circulating water supply portion and a valve adjusting demonstration portion; wherein the circulating water supply portion consists of a circulating water tank, a water pump, a high-level constant pressure water tank, an adjusting valve, a check valve, a water feed pipe, a water drain pipe, an overflow pipe, a water supply pipe, and a water return pipe; and the valve adjusting demonstration portion consists of a water separator, a water collector, and water pipe branches provided with demonstration valves and float flowmeters. The teaching demonstration device of the utility model adopts the percentage float flowmeter to perform direct display for percentage flow, thus good intuition is achieved; in addition, the teaching demonstration device can perform multiple types of valve demonstrations at the same time, thereby facilitating horizontal comparison of multiple valves.

Description

Teaching Demonstration Device for Valve Adjustment Characteristics

technical field

The utility model belongs to the technical field of fluid mechanics measuring equipment design, in particular to a teaching demonstration device for valve adjustment characteristics.

Background technique

Existing valve testing devices can test valve regulation characteristics, but because of the testing of valve technical performance, the requirements for measurement accuracy are high, and often include high-precision flow test instruments and control units, resulting in high cost of testing devices , not suitable for teaching demonstrations.

The existing relevant teaching experiment devices are mainly used for the demonstration of relevant knowledge of fluid mechanics, and there is no demonstration device for valve adjustment characteristics alone. Even if there are some fluid mechanics test benches that can perform valve adjustment experiments, they are limited to a single valve. For the commonly used ball valves, gate valves, butterfly valves, diaphragm valves, and balance valves widely used in heating systems recently, there is no complete set of experimental devices for teaching demonstration. In the teaching process, it is impossible to observe and compare the adjustment characteristics of different valves intuitively through experimental demonstration.

Contents of the invention

The purpose of the utility model is to provide a teaching demonstration device for valve adjustment characteristics, which is used to solve the problem that the adjustment characteristics of different valves cannot be observed and compared through experimental demonstration during the teaching process.

In order to achieve the above purpose, the technical solution proposed by the utility model is a teaching demonstration device for valve adjustment characteristics, which is characterized in that the device includes a circulating water supply part and a valve adjustment demonstration part;

The circulating water supply part is composed of a circulating water tank 1, a water pump 2, a high-level constant pressure water tank 3, a regulating valve 12, a check valve 13, an upper water pipe 14, a drain pipe 15, an overflow pipe 16, a water supply pipe 17 and a return pipe 18;

The circulating water tank 1, the water pump 2, the regulating valve 12, the check valve 13 and the high-level constant-pressure water tank 3 are sequentially connected through an upper water pipe 14;

The circulating water tank 1 and the high-level constant pressure water tank 3 are connected through a drain pipe 15;

One end of the overflow pipe 16 is connected to the circulating water tank 1, and the other end is inserted into the high-level constant-pressure water tank 3 and is higher than the bottom of the high-level constant-pressure water tank 3;

The valve adjustment demonstration part is composed of a water separator 4, a water collector 5 and a water pipe branch equipped with a demonstration valve and a float flowmeter 11;

The high-level constant pressure water tank 3 and the water distributor 4 are connected through a water supply pipe 17;

The circulating water tank 1 and the water collector 5 are connected through a water return pipe 18;

The water distributor 4 and the water collector 5 are connected with the water pipe branch of the rotameter by installing a demonstration valve.

The water pipe branch with the demonstration valve and the float flowmeter installed includes the water pipe branch with the balance valve 6 and the float flowmeter 11 installed, the water pipe branch with the ball valve 7 and the float flowmeter 11 installed, and the gate valve 8 and the float flowmeter. At least one water pipe branch in the water pipe branch of the flowmeter 11 , the water pipe branch installed with the butterfly valve 9 and the float flowmeter 11 , and the water pipe branch installed with the diaphragm valve 10 and the float flowmeter 11 .

On-off valves 19 are included on the pipelines of the upper water pipe 14 , the drain pipe 15 , the water supply pipe 17 and the water return pipe 18 .

The rotameter 11 is equipped with a percentage scale 21, and the percentage scale 21 includes a spring 22, a spring moving groove 23, a spring positioning lock 24 and a percentage scale pointer 25;

The spring moving groove 23 is fixedly installed on one side of the float flowmeter 11, and the top and bottom ends of the spring moving groove 23 are respectively aligned with the top and bottom ends of the float flowmeter 11;

The zero scale end of the percentage scale 21 is flush with the bottom end of the rotameter 11, and the 100% scale end of the percentage scale 21 is lower than the top of the rotameter 11 or flush with the top of the rotameter 11;

The bottom end of the spring 22 is fixed on the zero scale end of the percentage scale 21, and the top of the spring 22 can move freely along the spring moving groove 23;

The percentage scale pointer 25 is evenly arranged between the zero scale end of the percentage scale 21 and the 100% scale end of the percentage scale 21 , and each percentage scale pointer 25 is provided with a jack for inserting a spring positioning lock 24 .

The utility model adopts the percentage float flow meter to directly display the percentage flow rate, which is highly intuitive, and the utility model can simultaneously demonstrate various types of valves, which is convenient for horizontal comparison of multiple valves.

Description of drawings

Figure 1 is a structural diagram of a teaching demonstration device for valve adjustment characteristics;

Figure 2 is a schematic structural diagram of a rotameter with a percentage scale added;

Figure 3 is a schematic diagram of the adjustment of the rotameter with a percentage scale added.

Detailed ways

The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following descriptions are only illustrative, not intended to limit the scope of the present utility model and its application.

Figure 1 is a structural diagram of a teaching demonstration device for valve adjustment characteristics. In Fig. 1, the teaching demonstration device of valve adjustment characteristics provided by the utility model includes a circulating water supply part and a valve adjustment demonstration part. The circulating water supply part is composed of a circulating water tank 1, a water pump 2, a high-level constant pressure water tank 3, a regulating valve 12, a check valve 13, an upper water pipe 14, a drain pipe 15, an overflow pipe 16, a water supply pipe 17 and a return pipe 18. Circulating water tank 1 , water pump 2 , regulating valve 12 , check valve 13 and high-level constant-pressure water tank 3 are connected in sequence through upper water pipe 14 . The circulating water tank 1 and the high-level constant-pressure water tank 3 are connected through a drain pipe 15 . One end of the overflow pipe 16 is connected with the circulating water tank 1 , and the other end is inserted into the high-level constant-pressure water tank 3 and is higher than the bottom of the high-level constant-pressure water tank 3 .

The valve adjustment demonstration part consists of a water separator 4, a water collector 5, and a water pipe branch with a demonstration valve and a rotameter 11 installed. The high-level constant pressure water tank 3 and the water separator 4 are connected through the water supply pipe 17, the circulating water tank 1 and the water collector 5 are connected through the return pipe 18, and the water separator 4 and the water collector 5 are connected through the water pipe equipped with demonstration valves and rotameters branch connections.

The circulating water tank 1 and the high-level constant-pressure water tank 3 are both open water tanks. The capacity of the circulating water tank 1 is greater than that of the high-level constant-pressure water tank 3, and can accommodate all the water in the system, including the water in the high-level constant-pressure water tank and the water in each pipeline. of water.

In this teaching demonstration device, water pump 2 provides power for circulating water. During the demonstration, the water in the circulating water tank 1 enters the high-level constant pressure water tank 3 through the upper water pipe 14 after being pressurized by the water pump 2, and then enters the water separator 4 through the water supply pipe 17, and then flows through the tank equipped with the demonstration valve and the rotameter 11. In the water pipe branch, the valve opening adjustment demonstration is carried out. The water in the branch of the water pipe with the demonstration valve and the float flowmeter 11 is installed and returns to the circulating water tank after being combined by the water collector 5 . The high-level constant pressure water tank 3 maintains an overflow state, and excess circulating water directly returns to the circulating water tank 1 through the overflow pipe 16 to keep the water level stable and not affected by the adjustment of the opening of the demonstration valve.

Multiple parallel water pipe branches can be set between the water distributor 4 and the water collector 5 to demonstrate different types of valves. In this embodiment, a water pipe branch with a balance valve 6 and a float flowmeter 11 installed between the safety water device 4 and the water collector 5, a water pipe branch with a ball valve 7 and a float flowmeter 11 installed, and a water pipe branch with a ball valve 7 and a float flowmeter 11 installed The water pipe branch of the gate valve 8 and the float flow meter 11, the water pipe branch of the butterfly valve 9 and the float flow meter 11, and the water pipe branch of the diaphragm valve 10 and the float flow meter 11 are respectively used for balancing the balance valve 6 and the ball valve. 7. Gate valve 8, butterfly valve 9 and diaphragm valve 10 are demonstrated.

In addition, on-off valves 19 for controlling water flow in corresponding pipelines can also be installed on the pipelines of the upper water pipe 14 , the drain pipe 15 , the water supply pipe 17 and the water return pipe 18 .

Fig. 2 is a structural diagram of a rotameter with a percentage scale added. As shown in FIG. 2 , in the present utility model, the float flowmeter 11 is formed by adding a percentage scale 21 to a common float flowmeter. The percentage scale 21 includes a spring 22 , a spring moving groove 23 , a spring positioning lock 24 and a percentage scale pointer 25 . The spring moving groove 23 is fixedly installed on one side of the rotameter 11 , and the top and bottom ends of the spring moving groove 23 are respectively aligned with the top and bottom ends of the rotameter 11 . The zero scale end of the percentage scale 21 is flush with the bottom end of the rotameter 11 , and the 100% scale end of the percentage scale 21 is lower than the top of the rotameter 11 or flush with the top of the rotameter 11 . The bottom end of the spring 22 is fixed on the zero scale end of the percentage scale 21 , and the top end of the spring 22 can move freely along the spring moving groove 23 . The percentage scale pointer 25 is evenly arranged between the zero scale end of the percentage scale 21 and the 100% scale end of the percentage scale 21 , and each percentage scale pointer 25 is provided with a jack for inserting the spring positioning lock 24 . The float flowmeter 11 indicates the flow through different positions of the float 26, the absolute value of the flow is read by the existing scale 27 on the float flowmeter, and the flow percentage is read by the percentage scale pointer 25 corresponding to the float.

At the beginning of the operation of this teaching demonstration device, firstly open all the demonstration valves to make the system in the maximum flow state, adjust the water pump 2 and the regulating valve 12 to make the high-pressure positioning water tank 3 in the overflow state, and then observe the float flowmeter 11 of each water pipe branch The position of the float, record the maximum flow when the valve is fully open, and adjust the 100% scale pointer of the percentage scale along the spring moving groove 23 to point to the position of the float, and fix the spring positioning lock 24 again. After that, you can start the teaching demonstration, adjust the valve opening of each branch respectively, and directly observe and record the corresponding percentage flow through the percentage scale.

Then, carry out the experiment and demonstration of the valve adjustment characteristics of the reverse stroke, and gradually reduce the opening of each branch valve proportionally. After the indication of the float flowmeter is stable, observe and record the corresponding flow value and percentage flow until all branches are completely closed. valve.

Then, carry out the experimental demonstration of the positive stroke, repeat the test of the previous step, but the valve opening is gradually increased from zero to full open in proportion.

At the end of the experiment demonstration, the water pump is turned off, and the water in the high-level constant-pressure water tank 3 is discharged into the circulating water tank 1 through the drain pipe 15, and all teaching demonstrations are completed.

During the teaching demonstration, under different valve opening conditions, the corresponding percentage flow can be directly observed. At the same time, it can also directly compare the flow percentage difference of different valves under the same opening degree, which is intuitive and convenient for students to deepen their understanding of different valves and improve the teaching effect.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (4)

1. A teaching demonstration device for valve adjustment characteristics, characterized in that said device includes a circulating water supply part and a valve adjustment demonstration part; The circulating water supply part consists of a circulating water tank (1), a water pump (2), a high-level constant pressure water tank (3), a regulating valve (12), a check valve (13), an upper water pipe (14), a drain pipe (15), overflow pipe (16), water supply pipe (17) and water return pipe (18); The circulating water tank (1), water pump (2), regulating valve (12), check valve (13) and high-level constant pressure water tank (3) are sequentially connected through the upper water pipe (14); The circulating water tank (1) and the high-level constant-pressure water tank (3) are connected through a drain pipe (15); One end of the overflow pipe (16) is connected to the circulating water tank (1), and the other end is inserted into the high-level constant-pressure water tank (3) and is higher than the bottom of the high-level constant-pressure water tank (3); The valve adjustment demonstration part is composed of a water distributor (4), a water collector (5) and a water pipe branch installed with a demonstration valve and a float flowmeter (11); The high-level constant pressure water tank (3) and the water distributor (4) are connected through a water supply pipe (17); The circulating water tank (1) and the water collector (5) are connected through a return pipe (18); The water distributor (4) and the water collector (5) are connected with the water pipe branch of the rotameter by installing a demonstration valve. 2. A teaching demonstration device for valve adjustment characteristics according to claim 1, characterized in that the water pipe branch installed with demonstration valves and float flowmeters includes balance valves (6) and float flowmeters (11 ), water pipe branch with ball valve (7) and float flowmeter (11), water pipe branch with gate valve (8) and float flowmeter (11), butterfly valve (9) and float The water pipe branch of the flow meter (11) and at least one water pipe branch in the water pipe branch installed with the diaphragm valve (10) and the rotameter (11). 3. A teaching demonstration device for valve adjustment characteristics according to claim 1 or 2, characterized in that the upper water pipe (14), drain pipe (15), water supply pipe (17) and water return pipe (18) On-off valve (19) is included on the pipeline. 4. A teaching demonstration device for valve adjustment characteristics according to claim 1 or 2, characterized in that the rotameter (11) is equipped with a percentage scale (21), and the percentage scale (21) includes Spring (22), spring moving groove (23), spring positioning lock (24) and percentage scale pointer (25); The spring moving groove (23) is fixedly installed on one side of the rotameter (11), and the top and bottom ends of the spring moving groove (23) are respectively aligned with the top and bottom ends of the rotameter (11); The zero scale end of the percentage scale (21) is flush with the bottom end of the rotameter (11), and the 100% scale end of the percentage scale (21) is lower than the top of the rotameter (11) or at the same level as the rotameter. (11) tops are flush; The bottom end of the spring (22) is fixed on the zero scale end of the percentage scale (21), and the top end of the spring (22) can move freely along the spring moving groove (23); The percentage scale pointer (25) is evenly arranged between the zero scale end of the percentage scale (21) and the 100% scale end of the percentage scale (21), and each percentage scale pointer (25) is provided with a Socket for spring detent lock (24).

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