Negative pressure protection valve

Abstract

The utility model relates to a negative pressure protection valve which comprises a valve body and an upper cover, and the upper cover is installed on the valve body. The valve is characterized by further comprising a rubber diaphragm and a sealing piece, a first exhaust hole and a second exhaust hole are formed in the bottom of the valve body, the rubber diaphragm is arranged in the valve body and covers the first exhaust hole, and the lower portion of the upper cover protrudes and is pressed on the rubber diaphragm; and the sealing sheet covers the second exhaust hole. The valve is used for protecting the oil tank from being shrunken due to suction.

Description

Technical Field

[0001] The utility model relates to a valve body, in particular to a negative pressure protection valve. Background Art

[0002] Negative pressure protection valve is a product used between the carbon canister and the fuel tank. When the car engine is desorbed, a huge negative pressure will be generated in the carbon canister. If this negative pressure is not effectively released, the gas in the fuel tank will be directly sucked in. At this time, the fuel tank will be deflated or cracked, causing safety risks. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a negative pressure protection valve to solve the problem that the oil tank is deflated or cracked.

[0004] In order to solve the above technical problems, the utility model is achieved as follows:

[0005] A negative pressure protection valve comprises a valve body and an upper cover, wherein the upper cover is mounted on the valve body; the valve body is characterized in that the valve body also comprises a rubber diaphragm and a sealing sheet, a first exhaust hole and a second exhaust hole are arranged at the bottom of the valve body, the rubber diaphragm is arranged in the valve body and covers the first exhaust hole, the lower part of the upper cover is raised and pressed on the rubber diaphragm; the sealing sheet covers the second exhaust hole.

[0006] The negative pressure protection valve is characterized in that it also includes a sealing plate fixing frame, which is a semicircular bracket, both sides of which are welded to the bottom of the valve body, and the middle part is located at the upper part of one side of the sealing plate.

[0007] The negative pressure protection valve is characterized in that the sealing plate fixing frame is a plastic fixing frame, which is pressed on the sealing plate on one side, and the sealing plate is tilted upward due to the pressure difference to open the sealing plate.

[0008] The negative pressure protection valve is characterized in that the rubber diaphragm is a disc-shaped rubber diaphragm.

[0009] The negative pressure protection valve is characterized in that one side of the valve body is connected to the oil tank through a connecting pipe, and the other side of the valve body is connected to the carbon canister through a connecting head.

[0010] The negative pressure protection valve is characterized in that the connecting pipe end connected to the oil tank is a bamboo nozzle, and the connecting head connected to the carbon canister is a quick-plug nozzle.

[0011] The beneficial effect of the utility model is: it can be seen from the above technical scheme that the present application provides a negative pressure protection valve. When negative pressure exists on the carbon canister side, the rubber diaphragm and the small sealing sheet are tightly attached to the sealing surface, and the valve channel is closed, thereby protecting the carbon canister side from adsorbing the airflow of the fuel tank and protecting the safe use of the fuel tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1 This is a schematic structural diagram of the present application.

[0014] Figure 2 This is an exploded schematic diagram of the present application.

[0015] Figure 3 This is a schematic diagram of the seal sheet fixing bracket. Specific embodiments

[0016] The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0017] As Figure 1 、 2 shown: A negative pressure protection valve includes a valve body 1 and an upper cover 2, and the upper cover is installed on the valve body; characterized in that: it further includes a rubber diaphragm 3 and a seal sheet 4, the bottom of the valve body is provided with a first exhaust hole 5 and a second exhaust hole 6, the rubber diaphragm is arranged in the valve body and covers the first exhaust hole, and the lower part of the upper cover protrudes and presses on the rubber diaphragm; the seal sheet covers the second exhaust hole.

[0018] As Figure 3 shown: Further, it further includes a seal sheet fixing bracket 7, the seal sheet fixing bracket is a semi-circular bracket, the two sides of which are welded to the bottom of the valve body, and the middle part is located above one side of the seal sheet.

[0019] Further, the seal sheet fixing bracket is a plastic fixing bracket, which is pressed on the seal sheet unilaterally, and the seal sheet is lifted upward by the pressure difference to open the seal sheet.

[0020] Further, the rubber diaphragm is a disc-shaped rubber diaphragm.

[0021] Further, one side of the valve body is communicated with an oil tank 10 through a connecting pipe 8, and the other side of the valve body is communicated with a carbon canister 11 through a connector 9.

[0022] Further, the end of the connecting pipe connected to the oil tank is a bamboo joint nozzle, and the connector connected to the carbon canister is a quick insertion nozzle.

[0023] When the oil tank is working normally, the positive pressure / oil vapor inside the oil tank enters the valve, opens the rubber diaphragm, and enters the carbon canister for pressure release and exhaust. When there is negative pressure inside the oil tank, the seal sheet opens upward, and the carbon canister supplements air to the oil tank side.

[0024] When there is negative pressure on the carbon canister side, the rubber diaphragm and the small sealing piece are closely attached to the sealing surface, the valve channel is closed, protecting the carbon canister side from adsorbing the air flow of the fuel tank and ensuring the safe use of the fuel tank.

[0025] The above are only the embodiments provided by this application and are not used to limit this application. Although this application has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A negative pressure protection valve, comprising a valve body and an upper cover, wherein the upper cover is mounted on the valve body; characterized in that: It also includes a rubber diaphragm and a sealing sheet. The bottom of the valve body is provided with a first exhaust hole and a second exhaust hole. The rubber diaphragm is arranged in the valve body and covers the first exhaust hole. The lower part of the upper cover is raised and pressed on the rubber diaphragm; the sealing sheet covers the second exhaust hole.

2. A negative pressure protection valve according to claim 1, characterized in that: It also includes a sealing plate fixing frame, which is a semicircular frame, two sides of which are welded to the bottom of the valve body, and the middle part is located on the upper part of one side of the sealing plate.

3. A negative pressure protection valve according to claim 2, characterized in that: The sealing sheet fixing frame is a plastic fixing frame, which is pressed on the sealing sheet at one side, and the sealing sheet is tilted upward by the pressure difference to open the sealing sheet.

4. A negative pressure protection valve according to claim 1, characterized in that: The rubber diaphragm is a disc-shaped rubber diaphragm.

5. A negative pressure protection valve according to claim 1, characterized in that: One side of the valve body is connected to the oil tank through a connecting pipe, and the other side of the valve body is connected to the carbon canister through a connecting head.

6. A negative pressure protection valve according to claim 5, characterized in that: The connecting pipe end connected with the oil tank is a bamboo nozzle, and the connecting head connected with the carbon canister is a quick plug nozzle.

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