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

Abstract

The utility model 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 utility model further provides a dry ice production feeding structure which comprises the switch valve. The utility model further provides dry ice production equipment which comprises the dry ice production feeding structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical production equipment technical field more specifically, is related to a dry ice production feeding structure and dry ice production equipment. BACKGROUND

[0002] In the existing dry ice production equipment, usually including feeding system, compression cylinder and incoming pipe etc., wherein, the feeding system includes feeding valve and feeding nozzle and other components. Liquid carbon dioxide enters the feeding system through the incoming pipe, and then the carbon dioxide is converted from liquid to solid powder, i.e. dry ice, by the feeding system, that is, the liquid carbon dioxide forms solid carbon dioxide after instantaneous throttling and pressure reduction injection, then these 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 arranged in the feeding system to control the passage or non-passage of liquid carbon dioxide. In the process of liquid carbon dioxide transmission, liquid carbon dioxide inevitably remains in the switch valve, and once the switch valve is closed, the liquid carbon dioxide remaining in the switch valve is disconnected from the incoming pipe of liquid carbon dioxide, so the liquid carbon dioxide remaining in the switch valve cannot be kept in a high pressure state and is easily solidified due to pressure reduction. The dry ice formed after solidification can cause the switch valve to be blocked or unable to be normally opened. SUMMARY

[0004] The main technical problem to be solved by the utility model is to provide a switch valve which can avoid solidification of liquid carbon dioxide remaining in the switch valve.

[0005] In order to solve the above technical problems, the utility model provides a switch valve, which comprises a valve body and a valve core, and the valve core moves relative to the valve body under the action of external force in a first position and a second position.

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

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

[0008] In a preferred embodiment, the pressure maintaining port is in communication with the inlet when the valve core is in the first position.

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

[0010] The utility model also provides a dry ice production feeding structure, which is arranged between the compression cylinder of the dry ice production equipment and the incoming pipe of liquid carbon dioxide, and comprises:

[0011] The switch valve as described above, the inlet of the valve body is communicated with the incoming pipe;

[0012] The feeding device is arranged between the switch valve and the compression cylinder, and the feeding device comprises a feeding pipe and a feeding nozzle, one end of the feeding nozzle is communicated with the outlet of the switch valve through the feeding pipe, and the other end of the feeding nozzle is communicated with the compression cylinder.

[0013] The utility model also provides a dry ice production equipment, including dry ice production feeding structure as described above.

[0014] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

[0015] The utility model provides a switch valve, set up the pressure retaining mouth on the valve core, after the switch valve is closed, the liquid carbon dioxide that remains in the switch valve can be communicated with the incoming pipe of liquid carbon dioxide through the pressure retaining mouth, therefore can guarantee the pressure of liquid carbon dioxide in the switch valve does not reduce, also can avoid the situation that liquid carbon dioxide in the switch valve solidifies as dry ice because of pressure reduction. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the schematic view of the switch valve in the first position of the valve core in the preferred embodiment of the utility model;

[0017] Fig. 2 It is the schematic view of the switch valve in the second position of the valve core in the preferred embodiment of the utility model;

[0018] Fig. 3 It is the schematic view of the valve core in the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the technical scheme and characteristics of the utility model more clear, the utility model is further explained in detail in the following with the drawings and specific examples, and it should be understood that these examples are only for explaining the utility model and are not for limiting the scope of the utility model, after reading the utility model, the modification of various equivalent forms of the utility model of the person skilled in the art all fall in the range defined by the claims of the application.

[0020] REFERENCE Figs. 1-3The embodiment provides a dry ice production equipment, which comprises a dry ice production feeding structure. The dry ice production feeding structure is arranged between a compression cylinder of the dry ice production equipment and a liquid carbon dioxide feeding pipe, and comprises a switch valve, an inlet of a valve body of the switch valve being communicated with the feeding pipe; and a feeding device arranged between the switch valve and the compression cylinder, the feeding device comprising a feeding pipe and a feeding nozzle, one end of the feeding nozzle being communicated with an outlet of the switch valve through the feeding pipe, and the other end of the feeding nozzle being communicated with the compression cylinder.

[0021] During production, as long as the switch valve is opened, the liquid carbon dioxide can enter the feeding device through the feeding pipe and the switch valve, the liquid carbon dioxide is sprayed to form solid carbon dioxide (dry ice powder) through instant throttling pressure reduction of the feeding system, and then the dry ice powder is sent to the compression cylinder to be compressed into dry ice blocks.

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

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

[0024] In the embodiment, the valve core 2 further has a pressure maintaining opening 22 for maintaining the pressure in the flow channel 21. When the valve core 2 is located at the first position, the pressure maintaining opening 22 is communicated with the inlet 11. By arranging the pressure maintaining opening 22 on the valve core 2, after the switch valve is closed, the liquid carbon dioxide remaining in the switch valve can be communicated with the liquid carbon dioxide feeding pipe through the pressure maintaining opening 22, so that the pressure of the liquid carbon dioxide in the switch valve can be ensured not to be reduced, and the situation that the liquid carbon dioxide in the switch valve is solidified into dry ice due to pressure reduction can be avoided.

[0025] The above is only one specific embodiment of the utility model, but the design concept of the utility model is not limited to this, and any non-essential change of the utility model by using the concept belongs to the act of infringing the protection range of the utility model.

Claims

1. A switching valve characterized by: The on-off 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 external force; The valve core has a flow channel, the valve body has an inlet and an outlet, and when the valve core is in the first position, the flow channel is misaligned with the inlet or the outlet; when the valve core is in the second position, the flow channel is in communication with the inlet and the outlet; The valve core further has a pressure maintaining port for maintaining pressure in the flow channel.

2. A switch valve according to claim 1, characterized in that: When the valve core is in the first position, the pressure maintaining port is in communication with the inlet.

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

4. A dry ice production feeding structure provided between a compression cylinder of a dry ice production apparatus and a feed pipe of liquid carbon dioxide, characterized in that The on-off valve comprises: The on-off valve of claim 1 or 2 or 3, wherein the inlet of the valve body is in communication with the incoming pipe; A feeding device is arranged between the on-off valve and the compression cylinder, and the feeding device comprises a feeding pipe and a feeding nozzle, one end of the feeding nozzle is in communication with the outlet of the on-off valve through the feeding pipe, and the other end of the feeding nozzle is in communication with the compression cylinder.

5. A dry ice production apparatus characterized by comprising: The dry ice production feeding structure of claim 4.

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