Novel ultralow-temperature vacuum check valve

Abstract

The utility model relates to the technical field of valves, in particular to a novel ultralow-temperature vacuum check valve. The novel ultralow-temperature vacuum check valve comprises a valve assembly. The valve assembly comprises a valve body, a valve rod, a valve clack and a spring. The valve clack is arranged below the valve body, one end of the valve rod is connected with the valve clack, the other end of the valve rod penetrates through the valve body, the spring sleeves one end of the valve rod far away from the valve clack, one end of the spring is connected with the valve rod, and the other end of the spring is connected with the valve body; the valve rod can slide relative to the valve body, the valve clack and the valve body can be separated or abut against each other so as to open and close the check valve, and when the valve clack and the valve body are separated, the spring is in a stretching state. The ultralow-temperature check valve can play a role in negative pressure protection of a tank body, especially an ultralow-temperature tank body, and the deformation risk of the tank body caused by negative pressure is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a novel ultra-low temperature vacuum check valve. Background Art

[0002] Ultra-low temperature check valves are suitable for the transmission of ultra-low temperature media such as liquefied natural gas (LNG) and non-corrosive gases. LNG, in particular, is subjected to ultra-low temperatures exceeding -100°C during loading and unloading. These cryogenic environments place extremely high demands on check valves. Most soft sealing materials used as valve seals shrink and deform in these conditions, rendering them ineffective in preventing natural gas leaks. Furthermore, with a cracking pressure of -40 mbar, conventional valve structures are unable to open and close under this pressure differential. Utility Model Content

[0003] The purpose of the utility model includes providing a new type of ultra-low temperature vacuum check valve, which can play the role of negative pressure protection of the tank body, especially the ultra-low temperature tank body, and greatly reduce the risk of deformation of the tank body caused by negative pressure.

[0004] In order to achieve the above purpose, the preferred solution adopted by the present invention is:

[0005] A new type of ultra-low temperature vacuum check valve includes a valve assembly; the valve assembly includes a valve body, a valve stem, a valve disc and a spring; the valve disc is arranged below the valve body, one end of the valve stem is connected to the valve disc, and the other end passes through the valve body, and the spring is sleeved on the end of the valve stem away from the valve disc, one end of the spring is connected to the valve stem, and the other end is connected to the valve body; the valve stem can slide relative to the valve body, and the valve disc and the valve body can be separated or abutted to open and close the check valve, and when the valve disc is separated from the valve body, the spring is in a stretched state.

[0006] Furthermore, in a preferred embodiment of the present invention, a tank body is further included, the valve body is connected to the top end of the tank body, and the valve flap is located in the tank body.

[0007] Furthermore, in a preferred embodiment of the present invention, the valve body has a main section and a connecting section that are connected to each other; the main section is connected to the tank body, and the end of the connecting section away from the main section is used to contact or separate from the valve disc; the main section is provided with a plurality of first channels, and the connecting section is provided with a second channel, and the plurality of first channels are connected to the second channels; the cross-section of the connecting section is circular.

[0008] Furthermore, in a preferred embodiment of the present invention, it also includes a protective cover, which is arranged on the valve assembly and the tank body, and the bottom of the protective cover is connected to the tank body; a third channel for atmospheric circulation is formed between the protective cover and the tank body; when the valve disc is separated from the valve body, the atmosphere is connected to the interior of the tank body through the third channel, the first channel and the second channel respectively; when the valve disc and the valve body form abutment, the atmosphere is separated from the interior of the tank body.

[0009] Furthermore, in a preferred embodiment of the present invention, a gasket is provided at the connection between the valve body and the tank body.

[0010] The beneficial effects of the novel ultra-low temperature vacuum check valve provided by the utility model are:

[0011] The novel ultra-low temperature vacuum check valve provided by the utility model includes a valve assembly, which includes a valve body, a valve stem, a valve disc, and a spring. Based on the structural design of the valve body, valve stem, valve disc, and spring, as well as the design of the connection between them, the novel ultra-low temperature vacuum check valve can achieve the following:

[0012] (1) The check valve adopts an inverted check valve structure. Under normal conditions, the check valve generates an upward lifting force due to the spring force and the positive pressure of the tank medium, which causes the valve disc to move upward and act on the valve body, thereby closing the valve and sealing it. When the tank pressure drops to -40mbar, the atmospheric pressure overcomes the spring force, so that the air flow drives the valve disc downward and the valve opens. After the valve is opened, the flow channel can achieve the displacement requirement, thereby playing the role of negative pressure protection for the tank and greatly reducing the risk of deformation of the tank due to negative pressure.

[0013] (2) The check valve is used to be installed on the top of the ultra-low temperature container tank, with a design temperature of -196℃. When the medium in the tank undergoes a cold-hot transition, it can be used to prevent the tank from being deformed due to negative pressure in the tank;

[0014] (3) The check valve eliminates the trouble of regularly replacing the sealing surface of the soft sealing structure, thereby greatly increasing the service life of the valve;

[0015] (4) The check valve is designed with an enlarged disc area, which increases the thrust of the valve to open the atmosphere and weakens the effect of the spring, making the calculation under small pressure differences more accurate; at the same time, the contact surface required for machining accuracy between parts is reduced, making maintenance and problem finding more centralized and convenient; the aluminum alloy material used in the check valve makes the calculation of valve opening and closing more sensitive and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1A partial cross-sectional schematic diagram of the novel ultra-low temperature vacuum check valve provided in Example 1 of the present utility model in a closed state;

[0018] Figure 2 A partial cross-sectional schematic diagram of the novel ultra-low temperature vacuum check valve provided in Example 1 of the present utility model in an open state;

[0019] Icon: 10- low-temperature check valve, 100- valve assembly, 200- tank body, 300- protective cover, 400- gasket, 500- first channel, 600- second channel, 700- third channel, 110- valve body, 120- valve stem, 130- valve disc, 140- spring, 111- main section, 112- connecting section. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0023] Example 1

[0024] The following is combined with Figure 1-2 The utility model is further described as follows:

[0025] The utility model provides a new type of ultra-low temperature vacuum check valve 10, please refer to Figure 1-2 The novel ultra-low temperature vacuum check valve 10 includes a valve assembly 100 , a tank body 200 and a protective cover 300 . The valve assembly 100 includes a valve body 110 , a valve stem 120 , a valve disc 130 and a spring 140 .

[0026] In this embodiment, the valve flap 130 is arranged below the valve body 110, one end of the valve stem 120 is connected to the valve flap 130, and the other end passes through the valve body 110, and the spring 140 is sleeved on the end of the valve stem 120 away from the valve flap 130, one end of the spring 140 is connected to the valve stem 120, and the other end is connected to the valve body 110.

[0027] The valve body 110 comprises a main section 111 and a connecting section 112, which are interconnected. The main section 111 is connected to the top of the tank body 200, and a gasket 400 is provided at the connection between the valve body 110 and the tank body 200. The valve disc 130 is located within the tank body 200, and the end of the connecting section 112, remote from the main section 111, is used to contact or separate from the valve disc 130. The main section 111 defines a plurality of first channels 500, while the connecting section 112 defines a second channel 600, which communicates with the second channel 600. The connecting section 112 has a circular cross-section.

[0028] In this embodiment, the protective cover 300 is provided to cover the valve assembly 100 and the tank body 200, and the bottom of the protective cover 300 is connected to the tank body 200. A third channel 700 for atmospheric circulation is formed between the protective cover 300 and the tank body 200.

[0029] The valve stem 120 can slide relative to the valve body 110, and the valve flap 130 can separate from or abut the valve body 110, thereby opening and closing the check valve. When the valve flap 130 separates from the valve body 110, the atmosphere communicates with the interior of the tank body 200 through the third channel 700, the first channel 500, and the second channel 600, respectively, and the spring 140 is in a stretched state. When the valve flap 130 abuts the valve body 110, the atmosphere is separated from the interior of the tank body 200.

[0030] The novel ultra-low temperature vacuum check valve 10 provided in this embodiment works as follows: under normal conditions, the check valve generates an upward lifting force due to the force of the spring 140 and the positive pressure of the medium in the tank body 200, which causes the valve flap 130 to move upward and act on the connecting section 112 of the valve body 110, forming abutment with the valve body 110. At this time, the valve is closed and sealed.

[0031] When the pressure inside the tank body 200 drops to -40 mbar, due to the effect of the external atmospheric pressure, the atmospheric pressure overcomes the force of the spring 140, exerting downward force on the valve flap 130 so that the valve opens. The atmosphere is connected to the interior of the tank body 200 through the third channel 700, the first channel 500 and the second channel 600 respectively, thereby playing a role of negative pressure protection and greatly reducing the risk of deformation of the tank body 200 caused by negative pressure.

[0032] In summary, the novel ultra-low temperature vacuum check valve 10 provided in this embodiment can play the role of negative pressure protection of the tank body 200, especially the ultra-low temperature tank body 200, and greatly reduce the risk of deformation of the tank body 200 caused by negative pressure.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A new type of ultra-low temperature vacuum check valve, characterized in that: including valve components; The valve assembly includes a valve body, a valve stem, a valve disc and a spring; The valve disc is arranged below the valve body, one end of the valve stem is connected to the valve disc, and the other end passes through the valve body, the spring is sleeved on the end of the valve stem away from the valve disc, one end of the spring is connected to the valve stem, and the other end is connected to the valve body; The valve stem can slide relative to the valve body, and the valve flap can be separated from or abutted against the valve body to open and close the check valve. When the valve flap is separated from the valve body, the spring is in a stretched state.

2. The novel ultra-low temperature vacuum check valve according to claim 1 is characterized in that: It also includes a tank body, the valve body is connected to the top end of the tank body, and the valve flap is located in the tank body.

3. The novel ultra-low temperature vacuum check valve according to claim 2 is characterized in that: The valve body has a main section and a connecting section that are connected to each other; the main section is connected to the tank body, and the end of the connecting section away from the main section is used to contact or separate from the valve disc; the main section is provided with a plurality of first channels, and the connecting section is provided with a second channel, and the plurality of first channels are connected to the second channels; the cross-section of the connecting section is circular.

4. The novel ultra-low temperature vacuum check valve according to claim 3 is characterized in that: It also includes a protective cover, which is provided on the valve assembly and the tank body, and the bottom of the protective cover is connected to the tank body; a third channel for atmospheric circulation is formed between the protective cover and the tank body; when the valve flap is separated from the valve body, the atmosphere is connected to the interior of the tank body through the third channel, the first channel and the second channel respectively; when the valve flap is in contact with the valve body, the atmosphere is separated from the interior of the tank body.

5. The novel ultra-low temperature vacuum check valve according to claim 2 is characterized in that: A gasket is provided at the connection between the valve body and the tank body.

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