CN201133471Y - Gas proportional valve - Google Patents

Abstract

The utility model relates to a gas proportional valve. This gas proportional valve includes a valve body, the valve body is provided with a valve core and a valve port that cooperate with each other, a magnetic steel and a film are provided on the valve core, and a ratio iron core and a ratio coil are arranged on the top of the magnet steel. The magnetic steel with the middle hole is fixed on the upper end of the spool and is located under the membrane. The beneficial effects of the utility model are as follows: 1) The magnetic steel is located under the skin film, and the structure is simplified, the volume is reduced, and the installation is facilitated while the original performance remains unchanged. High rate and good consistency. 2) After the film changes its position, the volume of the upper cavity of the film is very small. In the case of overpressure of the air source, the film will not expand too much and be damaged and fail. 3) The valve port is realized by the machining method of the valve body itself, the precision of the valve port is greatly improved, the sealing performance of the valve port is improved, and the gas flow channel is also improved, the pressure loss is reduced, and the maximum pressure loss of the proportional valve is increased. flow.

Description

Gas proportional valve

technical field

The utility model relates to a gas valve, in particular to a gas proportional valve capable of controlling flow.

Background technique

The current gas dynamic magnetic proportional valve, as shown in Figure 2, has a valve core and a valve port that cooperate with each other in the valve body, and the opening size of the valve port can be changed by the movement of the valve core, so as to achieve the purpose of controlling the flow rate. The spool is generally equipped with a magnetic steel, and a ratio iron core and a ratio coil are installed above the magnet steel. After the current is passed through the ratio coil, a magnetic force can be generated on the magnet steel to push the magnetic core. Changing the magnitude of the current can generate different magnetic forces to push the spool, so as to finally achieve the purpose of controlling the flow. However, the current magnetic steel is located above the film, and a special magnetic steel seat is required to install the magnetic steel. The magnetic steel cover is fixed on the top of the film, so the volume of the entire valve body is large, and it is also affected by the magnetic steel seat. Make the epithelial cavity volume too large. In case of overpressure, it is easy to cause excessive expansion and damage of the membrane. Therefore, its structure is unreasonable, many parts, high cost, inconvenient to install, low yield and poor consistency. In addition, the current valve port is made of rubber and fixed inside the valve body. It is not integrated with the valve body. Its production requirements are high, and because the roundness of the rubber valve port is relatively poor, the yield of the proportional valve is not good. High, airtight stability is not ideal.

Contents of the invention

The utility model aims to solve the above-mentioned shortcomings of the prior art, and now the magnetic steel is changed into a middle hole structure, which can be directly installed on the valve core without pressing the box, and the magnetic steel is installed under the film, and the volume of the upper cavity of the film is very small. Can withstand greater overpressure. A gas proportional valve is provided in which the magnetic steel is located under the film, so as to achieve the purpose of simplifying the structure and reducing the volume. In addition, the valve port is realized by the machining method of the valve body itself, so that the valve port is smooth and consistent.

The utility model adopts the technical scheme to solve the technical problem: the gas proportional valve includes a valve body, the valve body is provided with a valve core and a valve port that cooperate with each other, a magnetic steel and a film are provided on the valve core, and a magnetic steel is provided above the magnetic steel. There is a ratio iron core and a ratio coil matched with it, and the magnetic steel with a middle hole is fixed on the upper end of the valve core and is located under the membrane.

The utility model can be further improved in the following ways:

The upper end of the spool is provided with a mounting shaft, on which the magnetic steel with holes and the pressure-receiving plate of the film are sleeved and pressed tightly by a spring clip. A ratio cover is provided above the film, and the distance between the film and the ratio cover is between 3-5 mm. The valve port and the valve body are integrated and formed by the valve body itself; the valve core is provided with a valve plug pad matching the valve port, and the surface of the valve plug pad is arc-shaped.

The beneficial effects of the utility model are as follows: 1) The magnetic steel is located under the film and is set on the valve core. Under the condition that the original performance remains unchanged, the structure is simplified, the volume is reduced, and the installation is facilitated. Low cost, easy assembly, high yield and good consistency. 2) After the film changes position, the distance from the cover plate is reduced, and the volume of the upper cavity of the film is small, so that the cover plate can protect the film. In the case of overpressure of the air source, the film will not expand too much and Damaged void. 3) The valve port is realized by the machining method of the valve body itself, so that the valve port is smooth, the consistency is good, the precision of the valve port is greatly improved, the sealing performance of the valve port is improved, and the flow path of the gas is also improved to reduce the pressure loss. Small, increasing the maximum flow rate of the proportional valve.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic structural diagram of the background technology.

Explanation of reference numerals: ratio iron core 1, ratio bracket 2, ratio coil 3, card 4, pressure receiving plate 5, ratio cover plate 6, magnetic steel 7, film 8, valve body 9, valve core 10, first spring 11 , Pressing sheet 12, valve plug pad 13, second spring 14, gasket 15, angle plate 16, air inlet 17, air outlet 18, magnetic steel cover 19, magnetic steel seat 20, valve port 21, installation shaft 22.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

This gas proportional valve comprises a valve body 9, which is provided with a valve core 10 and a valve port 21 that cooperate with each other in the valve body 9. There is a ratio iron core 1 and a ratio coil 3 matched with it, and the magnet steel 7 is fixed on the upper end of the valve core 10 and is located below the membrane 8 . The upper end of the spool 10 is provided with a mounting shaft 22 , and the magnetic steel 7 and the film 8 with a middle hole are sleeved on the mounting shaft 22 , and are compressed by the pressure receiving plate 5 . The magnetic steel 7 is installed below the skin film 8 instead, increasing the distance from the iron core 1 and the coil 3, the volume of the magnetic steel 7 is greatly reduced, and it can be placed on the spool 10. Therefore, in the case of the same function, the proportional valve has a compact structure and a small volume, which is beneficial to the assembly of the whole machine. A ratio cover plate 6 is arranged above the film 8, and the distance between the film 8 and the ratio cover plate 6 is between 3-5 millimeters. After the distance between the film 8 and the cover plate 6 is reduced, the cover plate 6 is made to protect the film 8 . The valve port 21 is integrated with the valve body 9 and is formed by the valve body 9 itself; the valve core 10 is provided with a valve plug pad 13 matching the valve port 21 , and the surface of the valve plug pad 13 is arc-shaped. A pressing piece 12 is pressed above the valve plug pad 13, and the surface of the pressing piece 12 is also arc-shaped. The valve port 21 adopts the material of the valve body 9 itself, and is processed with a numerically controlled machine tool. Therefore, the roundness of the valve port 21 has high precision and good consistency. The valve plug pad 13 is made of rubber, so that the airtightness is stable and the yield is high. The arc-shaped structure of the valve plug pad 13 and the pressing piece 12 also makes the proportional valve airtight and stable.

2 is the bracket, 4 is the card, 5 is the pressure plate, 11 is the first spring, 14 is the second spring, 15 is the gasket, 16 is the angle plate, 17 is the air inlet, 18 is the air outlet, 19 is Magnetic steel cover, 20 is magnetic steel seat.

Claims (4)

1. A gas proportional valve, comprising a valve body (9), the valve body (9) is provided with a valve core (10) and a valve port (21) that cooperate with each other, and the valve core (10) is provided with a magnetic steel (7 ), film (8), the top of the magnetic steel (7) is provided with a ratio iron core (1) and a ratio coil (3) matched with it, and it is characterized in that: the magnetic steel (7) is fixed on the spool (10 ) and below the membrane (8). 2. The gas proportional valve according to claim 1, characterized in that: the upper end of the valve core (10) is provided with a mounting shaft (22), and the magnetic steel (7) and the film (8) are set on the mounting shaft (22). on the shaft (22), and be compressed by the pressure plate (5). 3. The gas proportional valve according to claim 1 or 2, characterized in that: a ratio cover (6) is provided above the skin (8), and the distance between the skin (8) and the ratio cover (6) is 3 -5mm between. 4. The gas proportional valve according to claim 1 or 2, characterized in that: the valve port (21) is integrated with the valve body (9) and is formed by the valve body (9); the valve core (10) A valve plug pad (13) matching the valve port (21) is provided on the top, and the surface of the valve plug pad (13) is arc-shaped.

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