CN215487837U - Backflow prevention protection device of small storage tank - Google Patents
Backflow prevention protection device of small storage tank Download PDFInfo
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- CN215487837U CN215487837U CN202121302584.XU CN202121302584U CN215487837U CN 215487837 U CN215487837 U CN 215487837U CN 202121302584 U CN202121302584 U CN 202121302584U CN 215487837 U CN215487837 U CN 215487837U
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Abstract
The utility model relates to a backflow prevention protection device of a small storage tank, which is characterized in that: comprises a delivery pipeline arranged on a fuel storage tank; the liquid filling end of the conveying pipeline is exposed out of the fuel storage tank and is provided with a first one-way check valve, and the liquid outlet end of the conveying pipeline is communicated with the inner cavity of the fuel storage tank and is provided with a second one-way check valve. This prevent backflow protection device can effectively prevent that fuel from leaking or backward flow, the dependable performance, and the security is high.
Description
Technical Field
The utility model relates to a fuel storage tank, in particular to a backflow prevention protection device of a small storage tank.
Background
In the fuel storage tank for storing LPG (liquefied petroleum gas) in the market, liquid phase fuel is filled by a tank car during use, however, if the internal pressure of the fuel storage tank is too large during filling, the liquid phase/gas phase fuel may flow back and flow back, which makes it difficult to fill the liquid phase fuel. Therefore, it is desirable to design a backflow prevention protection device.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a backflow prevention protection device for a small storage tank, which can effectively prevent fuel from leaking or flowing backwards, and has reliable performance and high safety.
The purpose of the utility model is realized as follows:
a backflow prevention protection device for a small storage tank comprises a conveying pipeline arranged on a fuel storage tank; the liquid filling end of the conveying pipeline is exposed out of the fuel storage tank and is provided with a first one-way check valve, and the liquid outlet end of the conveying pipeline is communicated with the inner cavity of the fuel storage tank and is provided with a second one-way check valve.
The first one-way check valve includes a first valve seat and a first valve spool; the first valve seat is connected with the conveying pipeline, and a first through hole communicated with the conveying pipeline is formed in the first valve seat; the first valve core elastically resets and moves relative to the first valve seat, and elastically seals the first through hole.
The first valve seat is provided with a first valve cavity, one end of the first valve cavity is communicated with the conveying pipeline, and the other end of the first valve cavity is communicated with the first through hole; the first valve core is elastically and movably arranged on the first valve cavity.
The first one-way check valve includes a first resilient member; a supporting part is arranged on the first valve cavity; one end of the first elastic part acts on the first valve core, the other end of the first elastic part acts on the supporting part, and under the action of the first elastic part, the first valve core elastically resets and moves relative to the first valve seat.
The second one-way check valve includes a second valve seat and a second valve spool; the second valve seat is connected with a conveying pipeline, a second through hole and a liquid through hole are formed in the second valve seat, and the conveying pipeline is communicated with the inner cavity of the fuel storage tank through the second through hole and the liquid through hole in sequence; the second valve core elastically resets relative to the second valve seat and elastically seals the second through hole.
The second valve seat is provided with a second valve cavity which is respectively communicated with the second through hole and the liquid through hole; the second valve core is elastically and movably arranged on the second valve cavity.
The second one-way check valve includes a second resilient member; one end of the second elastic element acts on the second valve core, the other end of the second elastic element acts on the second valve seat, and under the action of the second elastic element, the second valve core elastically resets and moves relative to the second valve seat.
The second valve core is arranged on the second valve cavity in a piston mode, and a convex part used for plugging the second through hole is arranged on the second valve core; the second valve core divides the second valve cavity into two cavities, and the second through hole and the liquid through hole are respectively communicated with one cavity; and the second valve seat is provided with a pressure relief hole, and the other cavity is communicated with the inner cavity of the fuel storage tank through the pressure relief hole.
The utility model has the following beneficial effects:
the first one-way valve and the second one-way valve are arranged on the conveying pipeline, so that liquid phase/gas phase fuel in the fuel storage tank can be effectively prevented from leaking or flowing back, and the filling safety is ensured; in addition, the liquid filling is convenient, and the operation only needs to connect the liquid filling pipe with the delivery pipeline and open the liquid filling valve on the tank car; in addition, the first one-way valve and the second one-way valve can play a role in double protection, the reliability of preventing leakage or backflow is improved, and the safety factor is high.
Drawings
Fig. 1 is a schematic structural diagram according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a normally closed state of a first one-way check valve in accordance with an embodiment of the present invention.
Fig. 3 is a sectional view illustrating a conductive state of the first one-way check valve according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a second one-way check valve in a normally closed position in accordance with an embodiment of the present invention.
Fig. 5 is a sectional view illustrating a conductive state of the second one-way check valve according to an embodiment of the present invention.
Detailed Description
The utility model is further described with reference to the following figures and examples.
Referring to fig. 1 to 5, the backflow prevention device according to the present embodiment includes a delivery pipe 2 disposed in an inner cavity of a fuel storage tank 1, the fuel storage tank 1 being for storing LPG; the liquid filling end of the conveying pipeline 2 is exposed out of the side portion of the fuel storage tank 1 and is provided with a first one-way check valve 3, the liquid outlet end is communicated with the inner cavity of the fuel storage tank 1 and is provided with a second one-way check valve 4, a liquid filling pipe on the tank car is connected with the first one-way check valve 3, and liquid-phase fuel sequentially passes through the first one-way check valve 3, the conveying pipeline 2 and the second one-way check valve 4 to enter the inner cavity of the fuel storage tank 1 so as to complete liquid-phase fuel supply. The device can effectively prevent the liquid phase/gas phase fuel in the fuel storage tank from leaking or flowing back by arranging the first one-way valve and the second one-way valve on the conveying pipeline 2, thereby ensuring the filling safety; in addition, the liquid filling is convenient, and the operation only needs to connect the liquid filling pipe with the delivery pipeline and open the liquid filling valve on the tank car; in addition, the first one-way valve and the second one-way valve can play a role in double protection, the reliability of preventing leakage or backflow is improved, and the safety factor is high.
Further, referring to fig. 2 and 3, the first one-way check valve 3 includes a first valve seat 301 and a first spool 302; one end of the first valve seat 301 is inserted into the delivery pipe 2, a first through hole 310 communicated with the delivery pipe 2 is integrally formed at the other end of the first valve seat 301, and the first through hole 310 is communicated with the delivery pipe 2 through an inner cavity of the first valve seat 301; the first valve core 302 elastically resets and moves relative to the first valve seat 301, and elastically seals the first through hole 310; in the absence of external forces, the first valve element 302 effectively closes the first through hole 310 to prevent the liquid/gas phase fuel from leaking through the first through hole 310; to ensure airtightness, a first seal 305 is provided on the end surface of the first spool 302.
Further, a first valve cavity 309 is arranged on the inner side of the first valve seat 301, one end of the first valve cavity 309 is communicated with the conveying pipeline 2, and the other end of the first valve cavity 309 is communicated with a first through hole 310; the first valve core 302 is elastically and movably arranged in the first valve cavity 309; the first valve chamber 309 is provided with a baffle ring 306, a second sealing element 307 is arranged between the baffle ring 306 and the first through hole 310, so that the edge of the baffle ring 306 is in sealing fit with the edge of the first through hole 310, the central hole in the middle of the baffle ring 306 is communicated with the first through hole 310, and the first valve core 302 elastically acts on the baffle ring 306 to seal and seal the central hole in the baffle ring 306, so as to effectively seal the first through hole 310.
Further, the first one-way check valve 3 includes a first elastic member 303, the first elastic member 303 being a spiral cylinder/cone spring; a support portion 308 is integrally formed in the first valve chamber 309; one end of the first elastic element 303 acts on the first valve core 302, and the other end acts on the supporting part 308, and under the action of the first elastic element 303, the first valve core 302 elastically resets and moves relative to the first valve seat 301; a guide rod 304 extends from one side of the first valve element 302, and the guide rod 304 slidably penetrates through the support portion 308 to guide the first valve element 302 to linearly slide in the first valve element 302.
Further, referring to fig. 4 and 5, the second one-way check valve 4 includes a second valve seat 401 and a second spool 402; one end of the second valve seat 401 is inserted into the delivery pipe 2, a second through hole 410 and a liquid through hole 404 are integrally formed in the second valve seat 401, and the delivery pipe 2 is communicated with the inner cavity of the fuel storage tank 1 through the second through hole 410 and the liquid through hole 404 in sequence; the second valve core 402 elastically resets and moves relative to the second valve seat 401, and elastically seals the second through hole 410; in the absence of external forces, the second valve spool 402 effectively closes the second through-hole 410 to prevent the liquid/vapor phase fuel from leaking through the second through-hole 410.
Further, a second valve cavity 409 is arranged in the second valve seat 401, the second valve cavity 409 is respectively communicated with a second through hole 410 and a liquid through hole 404, specifically, the second through hole 410 is arranged at the end of the second valve cavity 409, and the liquid through holes 404 are arranged at the side of the second valve cavity 409; the second spool 402 is resiliently movably disposed in the second valve chamber 409.
Further, the second one-way check valve 4 includes a second elastic member 403, the second elastic member 403 being a helical cylindrical/conical spring; one end of the second elastic member 403 acts on the second valve spool 402, and the other end acts on the second valve seat 401, and the second valve spool 402 elastically returns to move relative to the second valve seat 401 by the second elastic member 403.
Further, a second valve core 402 is piston-arranged in the second valve cavity 409, and one end of the second valve core 402 is provided with a convex part 4021 for blocking the second through hole 410; the second valve core 402 divides the second valve cavity 409 into two chambers, and the second through hole 410 and the liquid through hole 404 are respectively communicated with one chamber; a pressure relief hole 407 is formed in the second valve seat 401, and the other cavity is communicated with the inner cavity of the fuel storage tank 1 through the pressure relief hole 407; in order to ensure air tightness, a second sealing element 405 is sleeved on the side part of the second valve core 402; an end cover 406 for sealing the second valve cavity 409 is arranged at the end part of the second valve seat 401, and a pressure relief hole 407 is arranged in the middle of the end cover 406.
The working principle is as follows:
under the normal use state, due to the action of the first one-way check valve 3 and the second one-way check valve 4, the fuel in the fuel storage tank 1 cannot leak outwards through the liquid filling end of the delivery pipe 2; any one of the first one-way check valve 3 and the second one-way check valve 4 is stuck to be invalid, and the other one plays a role, so that the double protection effect is achieved, and the safety is further improved. Specifically, in a normal use state, the first one-way check valve 3 and the second one-way check valve 4 are not affected by an external force, so the first spool 302 seals the first through hole 310, and the second spool 402 seals the second through hole 410.
When fuel needs to be filled into the fuel storage tank 1, a filling pipe on the tank car is connected with the conveying pipeline 2 (liquid filling end), a liquid filling valve on the tank car is opened, the first one-way check valve 3 is opened under the action of the filling pressure of the tank car, and the fuel enters the conveying pipeline 2 through the liquid filling end; the second one-way check valve 4 is opened under the action of filling pressure, and the fuel flows out from the liquid outlet end of the conveying pipeline 2 and finally enters the inner cavity of the fuel storage tank 1 to realize the filling of the fuel. Specifically, when the charge pressure is greater than the spring force acting on the first and second spools 302 and 402, the first spool 302 slides under the charge pressure and opens the first through hole 310, and the second spool 402 slides under the charge pressure and opens the second through hole 410.
When the fuel is filled, the liquid filling valve on the tank car is closed, the fuel stops being conveyed to the fuel storage tank 1, and the first one-way check valve 3 and the second one-way check valve 4 are respectively closed automatically, so that the fuel in the inner cavity of the fuel storage tank 1 is prevented from flowing back and leaking. Specifically, when the charging pressure disappears, the first valve core 302 elastically resets to seal the first through hole 310, and the second valve core 402 elastically resets to seal the second through hole 410.
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the utility model are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the utility model, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, and the utility model is intended to be protected by the following claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a protection device that prevents backward flow of small-size storage tank which characterized in that: comprises a delivery pipeline (2) arranged on a fuel storage tank (1); the liquid filling end of the conveying pipeline (2) is exposed out of the fuel storage tank (1) and is provided with a first one-way check valve (3), and the liquid outlet end of the conveying pipeline is communicated with the inner cavity of the fuel storage tank (1) and is provided with a second one-way check valve (4).
2. The backflow prevention protection device of claim 1, wherein: the first one-way check valve (3) comprises a first valve seat (301) and a first valve spool (302); the first valve seat (301) is connected with the conveying pipeline (2), and a first through hole (310) communicated with the conveying pipeline (2) is formed in the first valve seat (301); the first valve core (302) elastically resets and moves relative to the first valve seat (301), and elastically seals the first through hole (310).
3. The backflow prevention protection device of claim 2, wherein: a first valve cavity (309) is arranged on the first valve seat (301), one end of the first valve cavity (309) is communicated with the conveying pipeline (2), and the other end of the first valve cavity (309) is communicated with a first through hole (310); the first valve core (302) is elastically and movably arranged on the first valve cavity (309).
4. The backflow prevention protection device of claim 3, wherein: said first one-way check valve (3) comprises a first elastic member (303); a supporting part (308) is arranged on the first valve cavity (309); one end of the first elastic piece (303) acts on the first valve core (302), the other end acts on the supporting part (308), and under the action of the first elastic piece (303), the first valve core (302) elastically resets and moves relative to the first valve seat (301).
5. The backflow prevention protection device of claim 1, wherein: the second one-way check valve (4) comprises a second valve seat (401) and a second valve spool (402); the second valve seat (401) is connected with the conveying pipeline (2), a second through hole (410) and a liquid through hole (404) are formed in the second valve seat (401), and the conveying pipeline (2) is communicated with the inner cavity of the fuel storage tank (1) through the second through hole (410) and the liquid through hole (404) in sequence; the second valve core (402) elastically resets and moves relative to the second valve seat (401), and elastically seals the second through hole (410).
6. The backflow prevention protection device of claim 5, wherein: a second valve cavity (409) is arranged on the second valve seat (401), and the second valve cavity (409) is respectively communicated with a second through hole (410) and a liquid through hole (404); the second valve core (402) is elastically and movably arranged on the second valve cavity (409).
7. The backflow prevention protection device of claim 6, wherein: the second one-way check valve (4) comprises a second elastic member (403); one end of the second elastic element (403) acts on the second valve core (402), the other end of the second elastic element acts on the second valve seat (401), and under the action of the second elastic element (403), the second valve core (402) elastically resets and moves relative to the second valve seat (401).
8. The backflow prevention protection device of claim 6, wherein: the second valve core (402) is arranged on the second valve cavity (409) in a piston mode, and a convex part (4021) used for plugging the second through hole (410) is arranged on the second valve core (402); the second valve cavity (409) is divided into two chambers by the second valve core (402), and the second through hole (410) and the liquid through hole (404) are respectively communicated with one chamber; and a pressure relief hole (407) is formed in the second valve seat (401), and the other cavity is communicated with the inner cavity of the fuel storage tank (1) through the pressure relief hole (407).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121302584.XU CN215487837U (en) | 2021-06-10 | 2021-06-10 | Backflow prevention protection device of small storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121302584.XU CN215487837U (en) | 2021-06-10 | 2021-06-10 | Backflow prevention protection device of small storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215487837U true CN215487837U (en) | 2022-01-11 |
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ID=79784634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121302584.XU Active CN215487837U (en) | 2021-06-10 | 2021-06-10 | Backflow prevention protection device of small storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215487837U (en) |
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2021
- 2021-06-10 CN CN202121302584.XU patent/CN215487837U/en active Active
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