Switch valve, dry ice production feeding structure and dry ice production equipment

Abstract

The invention provides a switch valve which comprises a valve body and a valve element, and the valve element moves between a first position and a second position relative to the valve body under the action of external force. The valve element is provided with a flow channel, the valve body is provided with an inlet and an outlet, and when the valve element is located at the first position, the flow channel and the inlet or the outlet are staggered; when the valve element is located at the second position, the flow channel is communicated with the inlet and the outlet; the valve element is further provided with a pressure maintaining opening used for maintaining pressure in the flow channel. The invention further provides a dry ice production feeding structure which comprises the switch valve. The invention further provides dry ice production equipment which comprises the dry ice production feeding structure.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical production equipment, and more specifically, to a dry ice production charging structure and dry ice production equipment. Background Art

[0002] Existing dry ice production equipment usually includes a feeding system, a compression cylinder, and a feed pipe, among which the feeding system includes a feeding valve and a feeding nozzle. Liquid carbon dioxide enters the feeding system through the feed pipe, and then the carbon dioxide is converted from liquid to solid powder, i.e., dry ice, through the feeding system. That is, liquid carbon dioxide is sprayed through instant throttling and decompression to form solid carbon dioxide, and then, the dry ice powder is sent to the compression cylinder for compression molding.

[0003] However, in the existing dry ice production equipment, a switch valve is provided in the feeding system to control whether the liquid carbon dioxide passes through or not. In the process of liquid carbon dioxide transmission, there will inevitably be liquid carbon dioxide remaining in the switch valve, and once the switch valve is closed, the liquid carbon dioxide remaining in the switch valve is disconnected from the liquid carbon dioxide feed pipe. Therefore, the liquid carbon dioxide remaining in the switch valve cannot be maintained in a high-pressure state and is easily solidified quickly due to the pressure reduction. The dry ice formed after solidification can cause the switch valve to be blocked or unable to open normally. Summary of the invention

[0004] The main technical problem to be solved by the present invention is to provide a switch valve which can prevent the liquid carbon dioxide remaining in the switch valve from solidifying.

[0005] In order to solve the above technical problems, the present invention provides a switch valve, the switch valve comprises a valve body and a valve core, the valve core moves relative to the valve body between a first position and a second position under the action of an external force;

[0006] The valve core has a flow channel, the valve body is provided with an inlet and an outlet, when the valve core is in a first position, the flow channel is staggered with the inlet or the outlet; when the valve core is in a second position, the flow channel is connected with the inlet and the outlet;

[0007] The valve core also has a pressure-maintaining port for reducing the pressure in the flow channel.

[0008] In a preferred embodiment: when the valve core is located at the first position, the pressure maintaining port is connected to the inlet.

[0009] In a preferred embodiment: the switch valve is a ball valve.

[0010] The present invention also provides a dry ice production feeding structure, which is arranged between the compression cylinder of the dry ice production equipment and the feed pipe of the liquid carbon dioxide, and includes:

[0011] The switch valve as described above, wherein the inlet of the valve body is connected to the feed pipe;

[0012] A feeding device is arranged between the switch valve and the compression cylinder. The feeding device comprises a feeding pipe and a feeding nozzle. One end of the feeding nozzle is connected to the outlet of the switch valve through the feeding pipe, and the other end of the feeding nozzle is connected to the compression cylinder.

[0013] The present invention also provides dry ice production equipment, including the dry ice production charging structure as described above.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0015] The present invention provides an on-off valve, on which a pressure-maintaining port is arranged. After the on-off valve is closed, the liquid carbon dioxide remaining in the on-off valve can be connected to a feed pipe of the liquid carbon dioxide through the pressure-maintaining port, thereby ensuring that the pressure of the liquid carbon dioxide in the on-off valve does not decrease, and thus preventing the liquid carbon dioxide in the on-off valve from solidifying into dry ice due to pressure reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the switch valve in the preferred embodiment of the present invention when the valve core is in the first position;

[0017] Figure 2 It is a schematic diagram of the switch valve in the preferred embodiment of the present invention when the valve core is in the second position;

[0018] Figure 3 It is a schematic diagram of the valve core in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical solutions and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0020] refer to Figure 1-Figure 3 This embodiment provides a dry ice production device, including a dry ice production feeding structure. The dry ice production feeding structure is arranged between the compression cylinder of the dry ice production device and the feed pipe of liquid carbon dioxide, and includes: a switch valve, the inlet of the valve body of the switch valve is connected to the feed pipe; a feeding device is arranged between the switch valve and the compression cylinder, and the feeding device includes a feeding pipe and a feeding nozzle, one end of the feeding nozzle is connected to the outlet of the switch valve through the feeding pipe, and the other end of the feeding nozzle is connected to the compression cylinder.

[0021] During production, as long as the switch valve is opened, liquid carbon dioxide can enter the feeding device through the feed pipe and the switch valve. The liquid carbon dioxide is sprayed through the feeding system after instantaneous throttling and pressure reduction to form solid carbon dioxide, namely dry ice powder. Then, the dry ice powder is sent to the compression cylinder and compressed into dry ice blocks.

[0022] The switch valve in this embodiment is a ball valve, comprising a valve body 1 and a valve core 2. The valve core 2 moves relative to the valve body 1 between a first position and a second position under the action of an external force.

[0023] The valve core 2 has a flow channel 21, and the valve body 1 is provided with an inlet 11 and an outlet 12. When the valve core 2 is in the first position, the flow channel 21 is staggered with the inlet 11 or the outlet 12, and the switch valve is in a closed state at this time, and liquid carbon dioxide cannot pass through the switch valve; when the valve core 2 is in the second position, the flow channel 21 is connected with the inlet 11 and the outlet 12, and the switch valve is in an open state at this time, and liquid carbon dioxide can pass through the switch valve;

[0024] In this embodiment, the valve core 2 also has a pressure-maintaining port 22 for maintaining the pressure in the flow channel 21. When the valve core 2 is in the first position, the pressure-maintaining port 22 is connected to the inlet 11. By providing the pressure-maintaining port 22 on the valve core 2, after the switch valve is closed, the liquid carbon dioxide remaining in the switch valve can be connected to the liquid carbon dioxide feed pipe through the pressure-maintaining port 22, thereby ensuring that the pressure of the liquid carbon dioxide in the switch valve does not decrease, and thus preventing the liquid carbon dioxide in the switch valve from solidifying into dry ice due to pressure reduction.

[0025] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. Switch valve, characterized in that: The switch valve comprises a valve body and a valve core, and the valve core moves relative to the valve body between a first position and a second position under the action of an external force; The valve core has a flow channel, the valve body is provided with an inlet and an outlet, when the valve core is in a first position, the flow channel is staggered with the inlet or the outlet; when the valve core is in a second position, the flow channel is connected with the inlet and the outlet; The valve core also has a pressure-maintaining port for maintaining the pressure in the flow channel.

2. The switch valve according to claim 1, characterized in that: When the valve core is located at the first position, the pressure maintaining port is connected to the inlet.

3. The switch valve according to claim 1, characterized in that: The switch valve is a ball valve.

4. Dry ice production feeding structure, which is located between the compression cylinder of the dry ice production equipment and the liquid carbon dioxide feed pipe, is characterized by include: The switch valve according to claim 1, 2 or 3, wherein the inlet of the valve body is connected to the feed pipe; A feeding device is arranged between the switch valve and the compression cylinder. The feeding device comprises a feeding pipe and a feeding nozzle. One end of the feeding nozzle is connected to the outlet of the switch valve through the feeding pipe, and the other end of the feeding nozzle is connected to the compression cylinder.

5. Dry ice production equipment, characterized in that, The dry ice production charging structure comprises the dry ice production charging structure as claimed in claim 4.

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