Negative pressure channel valve

Abstract

The utility model discloses a negative pressure channel valve, which relates to the technical field of general gasoline engines and comprises a negative pressure chamber, a first connecting chamber and a second connecting chamber, a first elastic sealing element is arranged between the negative pressure chamber and the first connecting chamber, a second elastic sealing element is arranged in the second connecting chamber, and a sealing plate is fixedly mounted in the first connecting chamber. A connecting hole and a vent hole are formed in the sealing plate, the negative pressure chamber is communicated with an air inlet channel of an engine, the first connecting chamber is communicated with a carbon tank, the second connecting chamber is communicated with a balance hole of a carburetor, the second connecting chamber is communicated with the atmosphere, and a transmission assembly is arranged in the negative pressure channel valve and penetrates through the first elastic sealing piece and the connecting hole at the same time. The second elastic sealing piece is fixedly installed on the transmission assembly. Channels can be automatically switched through the negative pressure of the engine, when the engine is started, the atmosphere enters the balance hole of the carburetor through the second connecting chamber, the engine can operate normally, when the engine flames out, fuel steam can be absorbed by the carbon tank, and the evaporative emission standard of the general gasoline engine is met.

Description

Technical Field

[0001] The utility model relates to the technical field of general-purpose engines, in particular to a negative pressure channel valve. Background Art

[0002] General small gasoline engines generally use gasoline as fuel, and generate power by atomizing gasoline and burning it in the combustion cylinder of the engine. As is well known, the boiling point of gasoline is relatively low and it is very easy to volatilize at normal temperature, especially in summer with higher temperatures. Therefore, the gasoline in the fuel tank is usually not completely in a liquid state, and part of the gasoline volatilizes in the fuel tank and exists in the fuel tank in a gaseous state. If there is too much gaseous gasoline in the fuel tank, it will inevitably increase the pressure in the fuel tank, thus posing a greater threat to the safety of the fuel tank. In addition, if the gaseous gasoline is not treated, when the fuel tank filling port is opened, these gaseous gasoline will be discharged into the environment when new gasoline is added to the fuel tank, resulting in waste of resources and environmental pollution.

[0003] To prevent the fuel vapor in the fuel tank from being discharged into the atmosphere, a carbon canister is generally provided between the fuel tank and the engine in a general small gasoline engine. After the engine is turned off, the fuel vapor in the fuel tank must be sucked into the carbon canister to meet the evaporation emission standard. When the engine is started, the carburetor balance hole under the fuel tank must be connected to the atmosphere for the engine to operate normally.

[0004] In the prior art, the switching of the gas channel is controlled by the electrical signal of the solenoid valve. If the solenoid valve is damaged, the channel cannot be switched to the carburetor balance hole under the fuel tank, and the carburetor balance hole cannot be connected to the atmosphere, thus causing the engine to fail to operate normally and further affecting the use by customers. Content of the Utility Model

[0005] The purpose of the utility model is to provide a negative pressure channel valve, which can automatically switch the channel through the negative pressure of the engine, connect the carburetor balance hole to the atmosphere, and avoid the influence of the solenoid valve.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a negative pressure channel valve, which includes a negative pressure chamber, a first connection chamber and a second connection chamber arranged in sequence from left to right. The negative pressure chamber, the first connection chamber and the second connection chamber are interconnected. A first elastic seal is arranged between the negative pressure chamber and the first connection chamber. A second elastic seal is arranged in the second connection chamber. A sealing plate is fixedly installed on one side of the first connection chamber close to the second connection chamber. A connection hole and a ventilation hole are opened on the sealing plate. The negative pressure chamber is communicated with the intake air passage of the engine. The first connection chamber is communicated with the carbon canister. The second connection chamber is communicated with the carburetor balance hole, and the second connection chamber is communicated with the atmosphere. A transmission component is arranged in the negative pressure channel valve. The transmission component penetrates through the first elastic seal and the connection hole at the same time. The second elastic seal is fixedly installed on the transmission component.

[0007] The technical principle of the present utility model is as follows:

[0008] When the engine starts, the engine generates negative pressure, which is transmitted to the negative pressure chamber. Under the action of the negative pressure, the transmission component moves towards the negative pressure chamber, stretching the first elastic seal. At the same time, the second elastic seal abuts against the sealing plate, blocking the ventilation hole. The atmosphere enters the carburetor balance hole through the second connection chamber, and the engine can operate normally;

[0009] After the engine stalls, the negative pressure disappears. Under the action of the elastic force of the first elastic seal, the transmission component moves towards the second connection chamber, opening the ventilation hole. The second elastic seal is used to prevent the second connection chamber from communicating with the atmosphere. The fuel vapor in the fuel tank enters the second connection chamber through the carburetor balance hole, and under the action of the pressure, the fuel vapor enters the first connection chamber through the ventilation hole. Furthermore, the fuel vapor can be absorbed by the carbon canister connected to the first connection chamber.

[0010] Furthermore, it further includes a negative pressure pipe, a first air outlet pipe, a second air outlet pipe, and an intake pipe. One end of the negative pressure pipe is communicated with the negative pressure chamber, and the other end of the negative pressure pipe is communicated with the intake passage of the engine. One end of the first air outlet pipe is communicated with the first connection chamber, and the other end of the first air outlet pipe is communicated with the carbon canister. One end of the second air outlet pipe is communicated with the second connection chamber, and the other end of the second air outlet pipe is communicated with the atmosphere. One end of the intake pipe is communicated with the second connection chamber, and the other end of the intake pipe is communicated with the carburetor balance hole.

[0011] Furthermore, the second elastic seal is conical. When the engine is working, the base of the second elastic seal abuts against the sealing plate. When the engine is not working, the tip of the conical second elastic seal abuts against the second air outlet pipe.

[0012] Furthermore, a horizontally arranged limiting cylinder is fixedly installed in the negative pressure chamber. An elastic member is arranged outside the limiting cylinder. The transmission component is slidably arranged in the limiting cylinder and abuts against the elastic member.

[0013] Furthermore, the transmission component includes a transmission rod, a locking member, and a transmission cap. The transmission cap is horizontally slidably arranged in the limiting cylinder and abuts against the spring. The locking member is coaxially and fixedly installed on the transmission cap. The first elastic seal is coaxially and fixedly installed on the locking member. The transmission rod is coaxially and fixedly installed on the locking member, and the transmission rod penetrates through the connection hole. The second elastic seal is fixedly installed at the end of the transmission rod far from the locking member.

[0014] Furthermore, a groove is formed on the brim of the transmission cap, and the elastic member is arranged in the groove.

[0015] Furthermore, the number of ventilation holes is greater than 1.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. The channel can be automatically switched through the negative pressure of the engine. When the engine starts, the atmosphere enters the carburetor balance hole through the second connection chamber, and the engine can operate normally. When the engine shuts down, the fuel vapor can be absorbed by the carbon canister, meeting the evaporation emission standard of the general-purpose engine.

[0018] 2. By setting the spring, the resilience effect of the transmission component can be improved, the service life of the first elastic seal can be extended, and it can ensure that the second elastic seal always abuts against the second air outlet pipe, achieving a better sealing effect.

[0019] 3. Through the settings of the negative pressure pipe, the first air outlet pipe, the second air outlet pipe and the air inlet pipe, the connection of different parts to the negative pressure channel valve can be more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the present utility model;

[0021] Figure 2 is a cross-sectional view of the present utility model;

[0022] Figure 3 is a schematic view of the first elastic seal in the present utility model;

[0023] Figure 4 is a schematic view of the second elastic seal in the present utility model.

[0024] In the above-mentioned drawings:

[0025] 1. Negative pressure chamber; 2. First connection chamber;

[0026] 3. Second connection chamber; 301. Sealing plate; 3011. Connection hole; 3012. Ventilation hole;

[0027] 4. Negative pressure pipe; 5. First air outlet pipe; 6. Second air outlet pipe; 7. Air inlet pipe; 8. Limiting cylinder; 9. Elastic member; 10. First elastic seal; 11. Second elastic seal;

[0028] 12. Transmission component; 1201. Transmission cap; 1202. Locking member; 1203. Transmission rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; the structures described in various embodiments can be freely combined without conflict in terms of structure or principle.

[0030] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.

[0032] The following is a description of some embodiments of the present utility model with reference to the drawings:

[0033] As Figures 1 - 4 shown, the present utility model provides a negative pressure passage valve, which includes a negative pressure chamber 1, a first connection chamber 2, and a second connection chamber 3 arranged in sequence from left to right. The negative pressure chamber 1, the first connection chamber 2, and the second connection chamber 3 are in communication with each other. A first elastic seal 10 is arranged between the negative pressure chamber 1 and the first connection chamber 2. A second elastic seal 11 is arranged in the second connection chamber 3. A sealing plate 301 is fixedly installed on one side of the first connection chamber 2 close to the second connection chamber 3. A connection hole 3011 and a ventilation hole 3012 are formed on the sealing plate 301. The negative pressure chamber 1 is in communication with the intake passage of the engine. The first connection chamber 2 is in communication with the carbon canister. The second connection chamber 3 is in communication with the carburetor balance hole, and the second connection chamber 3 is in communication with the atmosphere. A transmission assembly 12 is arranged in the negative pressure passage valve. The transmission assembly 12 penetrates through the first elastic seal 10 and the connection hole 3011 at the same time. The second elastic seal 11 is fixedly installed on the transmission assembly 12.

[0034] The connection methods between the negative pressure chamber 1, the first connection chamber 2, and the second connection chamber 3 are all fixed connections. It is only necessary to ensure the sealing at the connection between the negative pressure chamber 1, the first connection chamber 2, and the second connection chamber 3. Here, it is preferably that the first connection chamber 2 is fixedly installed on the negative pressure chamber 1 through a flange, and the second connection chamber 3 is welded to the first connection chamber 2.

[0035] When the engine starts, the engine generates negative pressure, which is transmitted to the negative pressure chamber 1. Under the action of the negative pressure, the transmission component 12 moves towards the negative pressure chamber 1, stretching the first elastic seal 10. At the same time, the second elastic seal 11 abuts against the sealing plate 301, blocking the ventilation hole 3012. The atmosphere enters the carburetor balance hole through the second connection chamber 3, and the engine can operate normally;

[0036] After the engine shuts down, the negative pressure disappears. Under the action of the elastic force of the first elastic seal 10, the transmission component 12 moves towards the second connection chamber 3, opening the ventilation hole 3012. The second elastic seal 11 prevents the second connection chamber 3 from communicating with the atmosphere. The fuel vapor in the fuel tank enters the second connection chamber 3 through the carburetor balance hole. Under the action of the pressure, the fuel vapor enters the first connection chamber 2 through the ventilation hole 3012, and then the fuel vapor can be absorbed by the carbon canister connected to the first connection chamber 2.

[0037] The materials of the first elastic seal 10 and the second elastic seal 11 need to ensure elasticity to better achieve the sealing effect. Here, the materials of the first elastic seal 10 and the second elastic seal 11 are preferably rubber materials.

[0038] Furthermore, as Figure 1 shown, it further includes a negative pressure pipe 4, a first outlet pipe 5, a second outlet pipe 6 and an inlet pipe 7. One end of the negative pressure pipe 4 is connected to the negative pressure chamber 1, and the other end of the negative pressure pipe 4 is connected to the intake passage of the engine. One end of the first outlet pipe 5 is connected to the first connection chamber 2, and the other end of the first outlet pipe 5 is connected to the carbon canister. One end of the second outlet pipe 6 is connected to the second connection chamber 3, and the other end of the second outlet pipe 6 is connected to the atmosphere. One end of the inlet pipe 7 is connected to the second connection chamber 3, and the other end of the inlet pipe 7 is connected to the carburetor balance hole.

[0039] Through the negative pressure pipe 4, the intake pipe 7 of the engine can be more stably connected to the negative pressure passage valve. Through the first outlet pipe 5, the carbon canister can be more stably connected to the negative pressure passage valve. Through the inlet pipe 7, the carburetor balance hole can be more stably connected to the negative pressure passage valve. Here, the shapes of the negative pressure pipe 4, the first outlet pipe 5, the second outlet pipe 6 and the inlet pipe 7 are not limited and are determined according to the size of the actual general-purpose engine.

[0040] Furthermore, as Figure 2 and Figure 4 shown, the second elastic seal 11 is conical. When the engine is working, the base of the second elastic seal 11 abuts against the sealing plate 301. When the engine is not working, the tip of the conical second elastic seal 11 abuts against the second outlet pipe 6.

[0041] The second elastic sealing member 11 is shaped so that one end is small and the other end is large, ensuring that the small end can block the second air outlet pipe 6 and the large end can block the vent 3012 on the sealing plate 301. It is preferably conical in shape. The conical shape allows a portion of the tip to enter the second air outlet pipe 6, achieving a better sealing effect. Under the influence of the negative pressure of the engine, the base of the second elastic sealing member 11 can tightly fit against the sealing plate 301, sealing the vent 3012.

[0042] Furthermore, if Figure 2 As shown, a horizontally arranged limiting cylinder 8 is integrally formed in the negative pressure chamber 1 , an elastic member 9 is provided outside the limiting cylinder 8 , a transmission assembly 12 is slidably arranged in the limiting cylinder 8 , and the transmission assembly 12 abuts against the elastic member 9 .

[0043] The elastic member 9 can be a spring, a spring, etc., preferably a spring, which is coaxially sleeved on the limiting cylinder 8, and the left end of the spring is fixedly mounted on the inner wall of the negative pressure chamber 1. The provision of the spring can better rebound the transmission assembly 12 and ensure that the second elastic seal 11 always contacts the second outlet pipe 6, thereby achieving a better sealing effect.

[0044] Furthermore, if Figure 2 As shown, the transmission assembly 12 includes a transmission rod 1203, a locking piece 1202 and a transmission cap 1201. The transmission cap 1201 is horizontally slidably set in the limiting cylinder 8, and the transmission cap 1201 is against the spring. The locking piece 1202 is coaxially fixedly installed on the transmission cap 1201, the first elastic seal 10 is coaxially fixedly installed on the locking piece 1202, the transmission rod 1203 is coaxially fixedly installed on the locking piece 1202, and the transmission rod 1203 passes through the connecting hole 3011, and the second elastic seal 11 is fixedly installed on the end of the transmission rod 1203 away from the locking piece 1202.

[0045] The locking piece 1202 is riveted to the transmission cap 1201 , and the transmission rod 1203 is welded to the locking piece 1202 .

[0046] When the engine starts, negative pressure is generated in the negative pressure chamber 1. Under the action of negative pressure, the transmission cap 1201 moves to the left and slides horizontally in the limit cylinder 8, and compresses the elastic member 9. At the same time, the locking member 1202 and the transmission rod 1203 move to the left synchronously. When the locking member 1202 moves to the left, the first elastic seal 10 is stretched. When the transmission rod 1203 moves to the left, it drives the second elastic seal 11 to move to the left synchronously, and makes the second elastic seal 11 always against the sealing plate 301, blocking the vent 3012, so that the atmosphere and the carburetor balance hole are connected, ensuring the normal operation of the engine.

[0047] After the engine stalls, the negative pressure in the negative pressure chamber 1 disappears. Under the action of the spring and the first elastic seal 10, the transmission assembly 12 moves to the right, and the second elastic seal 11 always abuts against the second air outlet pipe 6, preventing the fuel from coming out of the carburetor balance hole from being discharged into the atmosphere through the second air outlet pipe 6, meeting the evaporation emission standard.

[0048] Further, as Figure 2 shown, a groove is formed on the brim of the transmission cap 1201, and the spring is arranged in the groove.

[0049] Through the arrangement of the groove, the spring can be better limited, preventing the spring from shifting during movement.

[0050] Further, as Figure 2 shown, the number of vent holes 3012 is greater than 1.

[0051] Through the arrangement of multiple vent holes 3012, the efficiency of the carbon canister collecting fuel vapor can be improved. Here, the number of vent holes 3012 is preferably 4.

Claims

1. A negative pressure channel valve, characterized in that: It includes a negative pressure chamber (1), a first connection chamber (2), and a second connection chamber (3) arranged in sequence from left to right. The negative pressure chamber (1), the first connection chamber (2), and the second connection chamber (3) are interconnected. A first elastic seal (10) is provided between the negative pressure chamber (1) and the first connection chamber (2). A second elastic seal (11) is provided in the second connection chamber (3). A sealing plate (301) is fixedly installed on the side of the first connection chamber (2) close to the second connection chamber (3). A connection hole (3011) and a ventilation hole (3012) are formed on the sealing plate (301). The negative pressure chamber (1) is communicated with the intake passage of the engine. The first connection chamber (2) is communicated with the carbon canister. The second connection chamber (3) is communicated with the balance hole of the carburetor, and the second connection chamber (3) is communicated with the atmosphere. A transmission assembly (12) is provided in the negative pressure passage valve. The transmission assembly (12) penetrates through the first elastic seal (10) and the connection hole (3011) at the same time. The second elastic seal (11) is fixedly installed on the transmission assembly (12).

2. The negative pressure channel valve according to claim 1, characterized in that, It further includes a negative pressure pipe (4), a first outlet pipe (5), a second outlet pipe (6), and an intake pipe (7). One end of the negative pressure pipe (4) is communicated with the negative pressure chamber (1), and the other end of the negative pressure pipe (4) is communicated with the intake passage of the engine. One end of the first outlet pipe (5) is communicated with the first connection chamber (2), and the other end of the first outlet pipe (5) is communicated with the carbon canister. One end of the second outlet pipe (6) is communicated with the second connection chamber (3), and the other end of the second outlet pipe (6) is communicated with the atmosphere. One end of the intake pipe (7) is communicated with the second connection chamber (3), and the other end of the intake pipe (7) is communicated with the balance hole of the carburetor.

3. The negative pressure passage valve according to claim 2, characterized in that, The second elastic seal (11) is conical. When the engine is working, the base of the second elastic seal (11) abuts against the sealing plate (301). When the engine is not working, the tip of the conical second elastic seal (11) abuts against the second outlet pipe (6).

4. A negative pressure channel valve according to any one of claims 1-3, characterized in that, A horizontally arranged limiting cylinder (8) is fixedly installed in the negative pressure chamber (1). An elastic member (9) is arranged outside the limiting cylinder (8). The transmission assembly (12) is slidably arranged in the limiting cylinder (8), and the transmission assembly (12) abuts against the elastic member (9).

5. The negative pressure passage valve according to claim 4, characterized in that, The transmission assembly (12) includes a transmission rod (1203), a locking member (1202), and a transmission cap (1201). The transmission cap (1201) is horizontally slidably arranged in the limiting cylinder (8), and the transmission cap (1201) abuts against the spring. The locking member (1202) is coaxially fixedly installed on the transmission cap (1201). The first elastic seal (10) is coaxially fixedly installed on the locking member (1202). The transmission rod (1203) is coaxially fixedly installed on the locking member (1202), and the transmission rod (1203) penetrates through the connection hole (3011). The second elastic seal (11) is fixedly installed on the end of the transmission rod (1203) far from the locking member (1202).

6. The negative pressure passage valve according to claim 5, characterized in that, A groove is formed on the brim of the transmission cap (1201). The elastic member (9) is arranged in the groove.

7. A negative pressure passage valve according to claim 1, 2, 3, 5 or 6, characterized in that, The number of the ventilation holes (3012) is greater than 1.

8. The negative pressure passage valve according to claim 4, characterized in that, The number of the ventilation holes (3012) is greater than 1.

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