Automatic injection valve

Abstract

The utility model discloses an automatic injection valve, including a valve body and a valve core, characterized in that: the valve core can be lifted and moved and arranged in the inner cavity of the valve body, a flow channel is formed between the valve core and the inner cavity wall of the valve body, the lower end of the valve core is sealed with the outlet of the lower end of the valve body, and the upper end of the valve core is equipped with a compression spring, the inner cavity of the valve body corresponding to the upper section of the valve core is set as a pressure-containing cavity, a piston is fixedly arranged on the corresponding upper section of the valve core, the piston is sealed and slidably matched with the wall of the pressure-containing cavity, an inlet for connecting the flow channel is arranged on one side of the valve body, and the inlet is located at the lower end of the pressure-containing cavity. The utility model adopts an internally arranged counterbalancing spring mechanism to balance the melt injection pressure.

Description

Technical Field

[0001] The utility model relates to an improved invention of a melt valve, in particular to an improved invention of an automatic injection valve. Background Art

[0002] Existing melt conveying usually adopts manual or electric control on and off to allow the melt to participate in processes such as filtration, injection of additives or catalysts. However, a certain flow rate is required during melt conveying to ensure the conveying volume and efficiency. Therefore, the conveyed melt needs to reach a certain pressure before it can be delivered. Manual or electric control needs to be combined with pressure detection to achieve constant pressure conveying, which makes the operation complicated, time-consuming and labor-intensive. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an automatic injection valve based on constant pressure delivery.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme to achieve the following: this kind of automatic injection valve includes a valve body and a valve core, and is characterized in that: the valve core can be lifted and moved and is arranged in the inner cavity of the valve body, a flow channel is formed between the valve core and the wall of the valve body inner cavity, the lower end of the valve core is sealed with the outlet of the lower end of the valve body, and the upper end of the valve core is equipped with a compression spring. The inner cavity of the valve body corresponding to the upper section of the valve core is set as a pressure-containing cavity, and a piston is fixedly provided on the corresponding upper section of the valve core. The piston is sealed and slidably matched with the wall of the pressure-containing cavity, and an inlet connecting the flow channel is provided on one side of the valve body, and the inlet is located at the lower end of the pressure-containing cavity.

[0005] An adjusting nut is provided at the upper end of the valve body, the compression spring is sleeved on the valve core, and the upper end of the compression spring abuts against the lower end of the adjusting nut, and the lower end of the compression spring abuts against a spring seat provided on the outer circle of the valve core, and the corresponding compression amount of the compression spring is controlled by the adjusting nut.

[0006] The lower end of the valve core is provided with a limiting structure for maintaining the coaxiality of the valve core and the valve body. The limiting structure is a radial limiting block fixed on the valve core, and the radial limiting block is slidably matched with the inner cavity wall of the valve body.

[0007] The beneficial effect of the utility model is that the improved automatic injection valve, the medium enters from the inlet, the pressure of which acts on the piston in the pressure-containing chamber and overcomes the pressure of the compression spring to open the valve; when the medium injection pressure is lower than the rated setting, the compression spring pressure pushes the valve core to seal the outlet and automatically close the flow channel, which has the beneficial effects of automatic delivery at constant pressure and automatic closing of the flow channel when pressure is lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0009] Figure 1It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0010] The accompanying drawings show the structure of the utility model, and the relevant details are further described below in conjunction with the accompanying drawings. In this embodiment, the automatic injection valve includes a valve body 1 and a valve core 2, the valve core 2 can be lifted and moved and arranged in the inner cavity of the valve body 1, a flow channel 3 is formed between the valve core 2 and the inner cavity wall of the valve body 1, the lower end of the valve core 2 is sealed with an outlet 8 at the lower end of the valve body 1, preferably a conical seal is adopted, and a compression spring 4 is arranged at the upper end of the valve core 2, the inner cavity of the valve body 1 corresponding to the upper section of the valve core 2 is set as a pressure-containing cavity 5, the cavity volume of the pressure-containing cavity 5 is slightly larger than that of the other parts, a piston 6 is fixedly arranged on the corresponding upper section of the valve core 2, the piston 6 is sealed and slidably matched with the wall of the pressure-containing cavity 5, and one or more sealing grooves and sealing rings are arranged on the outer circumferential surface of the corresponding piston 6, and an inlet 7 connected to the flow channel 3 is arranged on one side of the valve body 1, and the inlet 7 is located at the lower end of the pressure-containing cavity 5, and the inlet 7 is connected to a pipeline and its docking flange.

[0011] According to the working principle of the utility model, the medium enters the filling flow channel 3 and the pressure-containing chamber 5 from the inlet 7. When the medium pressure acts on the piston 6 of the valve core 2, it overcomes the elastic force of the compression spring 4, so that the valve core 2 is opened, and the medium flows out from the outlet 8 and enters the main pipeline connected thereto; when there is no medium or the medium pressure is insufficient, the valve is automatically closed under the elastic force of the compression spring 4.

[0012] As a further improved specific implementation method, an adjusting nut 9 is provided at the upper end of the valve body 1, the compression spring 4 is sleeved on the valve core 2, and the upper end of the compression spring 4 abuts against the lower end of the adjusting nut 9, and the lower end of the compression spring 4 abuts against a spring seat 10 arranged on the outer circle of the valve core 2. The corresponding compression amount of the compression spring 4 is controlled by the adjusting nut 9, and the compression amount of the compression spring is controlled to control the pressure of the medium to open the valve core 2.

[0013] As a further improved specific implementation, the lower end of the valve core 2 is provided with a limiting structure 11 for maintaining the coaxiality of the valve core 2 and the valve body 1. The limiting structure is a radial limiting block fixed on the valve core 2, and the radial limiting block is slidably matched with the inner cavity wall of the valve body 1, wherein the radial limiting block does not close the flow channel 3.

[0014] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic injection valve, comprising a valve body and a valve core, characterized in that: The valve core can be raised and lowered and moved and is arranged in the inner cavity of the valve body. A flow channel is formed between the valve core and the inner cavity wall of the valve body. The lower end of the valve core is sealed with the outlet of the lower end of the valve body. A compression spring is arranged on the upper end of the valve core. The inner cavity of the valve body corresponding to the upper section of the valve core is arranged as a pressure-containing cavity. A piston is fixedly arranged on the corresponding upper section of the valve core. The piston is sealed and slidably matched with the wall of the pressure-containing cavity. An inlet connecting the flow channel is arranged on one side of the valve body, and the inlet is located at the lower end of the pressure-containing cavity.

2. The automatic injection valve according to claim 1, characterized in that: An adjusting nut is provided at the upper end of the valve body, the compression spring is sleeved on the valve core, and the upper end of the compression spring abuts against the lower end of the adjusting nut, and the lower end of the compression spring abuts against a spring seat provided on the outer circle of the valve core, and the corresponding compression amount of the compression spring is controlled by the adjusting nut.

3. The automatic injection valve according to claim 1, characterized in that: The lower end of the valve core is provided with a limiting structure for maintaining the coaxiality of the valve core and the valve body. The limiting structure is a radial limiting block fixed on the valve core, and the radial limiting block is slidably matched with the inner cavity wall of the valve body.

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