Oil-gas automatic switching carburetor and carburetor system

Abstract

The utility model relates to an oil-gas automatic switching carburetor which comprises a carburetor body and an oil-gas automatic switching device, and the carburetor body is provided with a front-back through gas inlet channel. The automatic oil and gas switching device comprises a sealing needle, a reset piece, a first gas chamber shell, a second gas chamber shell, a gas chamber cover, a first diaphragm, a second diaphragm and a negative pressure channel, one end of the negative pressure channel is communicated with the second gas chamber shell, and the other end of the negative pressure channel is communicated with the gas inlet channel. When the engine runs at a high speed, large negative pressure is generated in the air inlet channel, the pressure of gas fuel is not enough to push the second diaphragm, the second diaphragm is sucked through the air inlet channel by means of the negative pressure of the air inlet channel, enough force is provided for the second diaphragm to close the fuel inlet, and the liquid fuel channel is completely closed. Therefore, liquid fuel and gas fuel are prevented from being mixed and supplied to the engine.

Description

Technical Field

[0001] The utility model relates to the technical field of carburetors, in particular to an oil-gas automatic switching carburetor and a carburetor system. Background Art

[0002] Existing dual fuel carburetors such as Figure 1 As shown in the utility model patent with patent announcement number CN216841967U, a new dual-fuel carburetor oil and gas automatic switching device includes an air chamber housing, a reset part, a sealing needle, a first diaphragm, a second diaphragm and an air chamber cover. The air chamber housing is fixed to the air chamber cover to form an air chamber. A first diaphragm and a second diaphragm are provided in the air chamber to isolate the air chamber into a first chamber, a second chamber and a third chamber that are not connected to each other. The air chamber cover is provided with an air vent and communicates with the outside world through the air vent. An air inlet connected to the third chamber is provided on the air chamber cover. The front end of the sealing needle is penetrated by the air chamber housing, and the sealing needle can move to block the liquid fuel channel of the carburetor.

[0003] In the existing dual-fuel carburetor, the gas fuel feed end of the dual-fuel carburetor is connected to the air chamber cover and the engine through a tee, and the pressure of the gas fuel is supplied to the air chamber cover and the engine at the same time.

[0004] The prior art has the following problems:

[0005] When using the above-mentioned oil-gas automatic switching device, the inventor found that when the engine is running at high speed, most of the pressure of the gas fuel is utilized by the engine, resulting in the gas fuel pressure being insufficient to push the second diaphragm, the liquid fuel channel cannot be completely closed, and the liquid fuel and gas fuel are mixed and supplied to the engine. Summary of the Invention

[0006] In view of the above problems, the present application provides an automatic oil-gas switching carburetor and carburetor system, which is used to solve the technical problem that when the engine is running at high speed, most of the pressure of the gas fuel is utilized by the engine, resulting in the pressure of the gas fuel being insufficient to push the second diaphragm, the liquid fuel channel cannot be completely closed, and the liquid fuel and gas fuel are mixed and supplied to the engine.

[0007] To achieve the above objectives, in a first aspect, the present application provides an oil-gas automatic switching carburetor, comprising:

[0008] A carburetor body, wherein the carburetor body is provided with an air intake passage running through the front and rear;

[0009] An automatic oil-gas switching device, comprising a sealing needle, a reset member, a first air chamber housing, a second air chamber housing, an air chamber cover, a first diaphragm, a second diaphragm, and a negative pressure channel. The carburetor body is provided with an oil cup and a main metering channel. The oil cup is connected to the main metering channel via a liquid fuel inlet. The sealing needle is used to block the liquid fuel inlet, and the reset member is used to reset the sealing needle.

[0010] The first air chamber housing is arranged on the carburetor body, the second air chamber housing is arranged on the outside of the first air chamber housing, the air chamber cover is arranged on the outside of the second air chamber housing, the first diaphragm is located between the second air chamber housing and the first air chamber housing, the second diaphragm is located between the air chamber cover and the second air chamber housing, one end of the negative pressure channel is connected to the second air chamber housing, and the other end of the negative pressure channel is connected to the intake channel.

[0011] As an embodiment of the present invention, a first chamber is formed between the first air chamber housing and the first diaphragm, a second chamber is formed between the first diaphragm and the second diaphragm, and the negative pressure channel is connected to the second chamber.

[0012] As an embodiment of the present invention, an air inlet hole is provided on the second air chamber shell, the air inlet channel is connected to the air inlet hole, and the air inlet hole is located in the second chamber.

[0013] As an embodiment of the present invention, the second air chamber housing is provided with a gas groove, the gas groove is communicated with the air inlet, and the gas groove is provided on a side opposite to the second diaphragm.

[0014] As an implementation manner of the present invention, the cross-section of the gas groove is arc-shaped, and the air inlet is connected to the middle portion of the gas groove.

[0015] As an embodiment of the present invention, an air inlet is provided on the air chamber cover, and the second diaphragm and the air chamber cover form a third chamber.

[0016] As an embodiment of the present invention, a vent hole is provided on the second air chamber shell, and the vent hole is communicated with the second chamber.

[0017] As an embodiment of the present utility model, a first ventilation joint is provided on the second air chamber shell, and the first ventilation joint is connected to the interior of the second air chamber shell. A second ventilation joint is provided on the carburetor body, and the second ventilation joint is connected to the intake channel. One end of the negative pressure channel is sealed with the first ventilation joint, and the other end of the negative pressure channel is sealed with the second ventilation joint.

[0018] As an embodiment of the present invention, the surface area of ​​the second diaphragm is greater than the surface area of ​​the first diaphragm.

[0019] Different from the existing technology, the technical solution of the present application is provided with a negative pressure channel, one end of the negative pressure channel is connected to the second air chamber shell, and the other end of the negative pressure channel is connected to the intake channel, and the negative pressure of the intake channel is borrowed through the negative pressure channel; when the engine is running at a low speed, the pressure of the gas fuel is sufficient to push the second diaphragm, the second diaphragm pushes the first diaphragm, and the first diaphragm drives the sealing needle to close the liquid fuel inlet. When the engine is running at a high speed, a large negative pressure is generated in the intake channel, and the pressure of the gas fuel is insufficient to push the second diaphragm. Through the intake channel, the negative pressure of the intake channel is used to suck the second diaphragm, and the second diaphragm is provided with sufficient force to close the fuel inlet, and the liquid fuel channel is completely closed, thereby preventing the liquid fuel and gas fuel from mixing and supplying the engine.

[0020] To achieve the above objectives, in a second aspect, the present application provides a carburetor system, comprising an oil-gas automatic switching carburetor as described in any one of the above.

[0021] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of this application. In order to enable ordinary technicians in this field to understand the technical solution of this application more clearly, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purposes and other purposes, features and advantages of this application easier to understand, the following is an explanation in combination with the specific implementation methods and drawings of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of this application and other related contents, and are not to be considered as limiting this application.

[0023] In the drawings of the specification:

[0024] Figure 1 This is a schematic structural diagram of a novel dual-fuel carburetor oil-gas automatic switching device, which is the background technology of this application;

[0025] Figure 2 A perspective view of an oil-gas automatic switching carburetor according to an embodiment of the present application;

[0026] Figure 3 This is a schematic structural diagram of a second diaphragm of an oil-gas automatic switching carburetor according to an embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of the second air chamber housing of an oil-gas automatic switching carburetor according to one embodiment of the present application;

[0028] Figure 5 This is a three-dimensional view of the second air chamber housing according to one embodiment of the present application.

[0029] The reference numerals in the above drawings are described as follows:

[0030] 1. Carburetor body, 11. Intake channel, 111. Second ventilation joint, 12. Oil cup,

[0031] 2. Oil-gas automatic switching device, 23. First air chamber shell, 24. Second air chamber shell, 241. Air inlet, 242. Gas groove, 243. Air vent, 244. First ventilation joint, 25. Air chamber cover, 26. First diaphragm, 27. Second diaphragm, 28. Negative pressure channel. DETAILED DESCRIPTION

[0032] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0033] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0034] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0035] In this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three possible relationships exist. For example, "X and / or Y" means: X exists, Y exists, and both X and Y exist. Furthermore, the character " / " generally indicates that the objects are in an "or" logical relationship.

[0036] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0037] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0038] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0039] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0040] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] According to some embodiments of this application, please refer to Figures 1 to 5This embodiment relates to a carburetor with automatic oil-gas switching, comprising a carburetor body 1 and an automatic oil-gas switching device 2. The carburetor body 1 is provided with an intake passage 11 extending from front to back. The automatic oil-gas switching device 2 includes a sealing needle, a reset member, a first air chamber housing 23, a second air chamber housing 24, an air chamber cover 25, a first diaphragm 26, a second diaphragm 27, and a negative pressure passage 28. The carburetor body 1 is provided with an oil cup 12 and a main metering passage. The oil cup 12 is connected to the main metering passage via a liquid fuel inlet. The sealing needle is used to block the liquid fuel inlet, and the reset member is used to reset the sealing needle.

[0042] The first air chamber housing 23 is arranged on the carburetor body 1, the second air chamber housing 24 is arranged on the outside of the first air chamber housing 23, the air chamber cover 25 is arranged on the outside of the second air chamber housing 24, the first diaphragm 26 is located between the second air chamber housing 24 and the first air chamber housing 23, the second diaphragm 27 is located between the air chamber cover 25 and the second air chamber housing 24, one end of the negative pressure channel 28 is connected to the second air chamber housing 24, and the other end of the negative pressure channel 28 is connected to the intake channel 11.

[0043] In this embodiment, the principles of the sealing needle, reset member, oil cup 12 and main metering channel of the oil-gas automatic switching device 2 are the same as those of the new dual-fuel carburetor oil-gas automatic switching device 2 in the background technology, and will not be repeated here.

[0044] According to some embodiments of the present application, optionally, a first chamber is formed between the first air chamber housing 23 and the first diaphragm 26 , a second chamber is formed between the first diaphragm 26 and the second diaphragm 27 , and the negative pressure channel 28 is connected to the second chamber.

[0045] In this way, negative pressure can be provided to the second diaphragm 27 to assist the second diaphragm 27 in pushing the first diaphragm 26 .

[0046] According to some embodiments of the present application, optionally, an air inlet hole 241 is provided on the second air chamber shell 24 , the air inlet channel 11 is connected to the air inlet hole 241 , and the air inlet hole 241 is located in the second chamber.

[0047] In this way, the air inlet channel 11 is connected to the second chamber through the air inlet hole 241 to provide negative pressure.

[0048] According to some embodiments of the present application, optionally, the second air chamber housing 24 is provided with a gas groove 242 , the gas groove 242 is communicated with the air inlet 241 , and the gas groove 242 is provided on a side opposite to the second diaphragm 27 .

[0049] In this way, the second diaphragm 27 is better attracted by the gas groove 242 and the force is evenly distributed.

[0050] According to some embodiments of the present application, optionally, the cross-sectional shape of the gas groove 242 is arc-shaped, and the air inlet 241 is connected to the middle portion of the gas groove 242 .

[0051] In this way, the negative pressure is made more uniform through the arc-shaped gas groove 242 , and the second diaphragm 27 is better adsorbed to provide negative pressure for the second diaphragm 27 .

[0052] According to some embodiments of the present application, optionally, an air inlet is provided on the air chamber cover 25 , and the second diaphragm 27 and the air chamber cover 25 form a third chamber.

[0053] In this embodiment, the principles of the first chamber, the second chamber and the third chamber are the same as those of the novel dual-fuel carburetor oil-gas automatic switching device 2 in the background art, and will not be repeated here.

[0054] In this way, air can be easily introduced into the air chamber cover 25 through the air inlet.

[0055] According to some embodiments of the present application, optionally, a vent hole 243 is provided on the second air chamber housing 24 , and the vent hole 243 is communicated with the second chamber.

[0056] In this way, the vent hole 243 is connected to the external atmospheric pressure. During use, when only the liquefied gas or natural gas is open, the second diaphragm 27 is subjected to positive pressure. The second diaphragm 27 is attached to the second air chamber housing 24, blocking the vent hole 243. When the engine is running at high speed, the negative pressure channel 28 provides negative pressure. The second diaphragm 27 receives the superposition of positive and negative pressures at the same time, pushing the first diaphragm 26.

[0057] If the liquefied gas or natural gas is not opened and there is no positive pressure on the second diaphragm 27, the second diaphragm 27 will not be attached to the second air chamber housing 24, the vent hole 243 will not be closed, and the second chamber will be connected to the atmosphere. In this case, the engine will generate negative pressure, but it will not close the first diaphragm 26. In other words, when using liquid fuel, the first diaphragm 26 will not be affected and the liquid fuel inlet will not be closed.

[0058] According to some embodiments of the present application, optionally, a first ventilation joint 244 is provided on the second air chamber housing 24, and the first ventilation joint 244 is connected to the interior of the second air chamber housing 24; a second ventilation joint 111 is provided on the carburetor body 1, and the second ventilation joint 111 is connected to the intake channel 11; one end of the negative pressure channel 28 is sealedly connected to the first ventilation joint 244, and the other end of the negative pressure channel 28 is sealedly connected to the second ventilation joint 111.

[0059] In this way, the negative pressure channel 28 can be easily installed.

[0060] According to some embodiments of the present application, optionally, the surface area of ​​the second diaphragm 27 is greater than the surface area of ​​the first diaphragm 26 .

[0061] In this way, the second diaphragm 27 can push the first diaphragm 26 more easily.

[0062] Different from the prior art, the technical solution of the present application is provided with a negative pressure channel 28, one end of the negative pressure channel 28 is connected to the second air chamber shell 24, and the other end of the negative pressure channel 28 is connected to the intake channel 11, and the negative pressure of the intake channel 11 is borrowed through the negative pressure channel 28; when the engine is running at a low speed, the pressure of the gas fuel is sufficient to push the second diaphragm 27, the second diaphragm 27 pushes the first diaphragm 26, and the first diaphragm 26 drives the sealing needle to close the liquid fuel inlet; when the engine is running at a high speed, a large negative pressure is generated in the intake channel 11, and the pressure of the gas fuel is insufficient to push the second diaphragm 27, and the negative pressure of the intake channel 11 is utilized through the intake channel 11 to suck the second diaphragm 27, providing the second diaphragm 27 with sufficient force to close the fuel inlet, and the liquid fuel channel is completely closed, thereby preventing the liquid fuel and the gas fuel from mixing and supplying the engine.

[0063] The present application provides a carburetor system, comprising any one of the above-mentioned automatic oil-gas switching carburetors.

[0064] In this embodiment, the liquefied gas tank is connected to the three-way valve through a pressure reducing valve. One outlet end of the three-way valve is connected to the air inlet of the oil-gas automatic switching device 2, providing positive pressure for the second diaphragm 27 of the oil-gas automatic switching device 2. The second diaphragm 27 drives the first diaphragm 26, and the first diaphragm 26 closes the liquid fuel inlet; the other outlet end of the three-way valve passes through the negative pressure valve to the carburetor and finally enters the engine.

[0065] Alternatively, the natural gas pipeline is connected to a three-way valve, one outlet end of the three-way valve is connected to the air inlet of the oil-gas automatic switching device 2, providing positive pressure for the second diaphragm 27 of the oil-gas automatic switching device 2, the second diaphragm 27 drives the first diaphragm 26, and the first diaphragm 26 closes the liquid fuel inlet; the other outlet end of the three-way valve passes through the negative pressure valve to the carburetor and finally enters the engine.

[0066] However, when the engine is running at high speed, the pressure of the liquefied gas tank or the natural gas pipeline is sucked away by the engine. The pressure of the liquefied gas tank or the natural gas pipeline is low and cannot drive the second diaphragm 27 to push the first diaphragm 26. Therefore, a negative pressure channel 28 is added to provide negative pressure for the first diaphragm 26 to compensate for the thrust of the first diaphragm 26 pushing the second diaphragm 27.

[0067] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An oil and gas automatic switching carburetor, characterized in that: include: A carburetor body, wherein the carburetor body is provided with an air intake passage running through the front and rear; An automatic oil-gas switching device, comprising a sealing needle, a reset member, a first air chamber housing, a second air chamber housing, an air chamber cover, a first diaphragm, a second diaphragm, and a negative pressure channel. The carburetor body is provided with an oil cup and a main metering channel. The oil cup is connected to the main metering channel via a liquid fuel inlet. The sealing needle is used to block the liquid fuel inlet, and the reset member is used to reset the sealing needle. The first air chamber housing is arranged on the carburetor body, the second air chamber housing is arranged on the outside of the first air chamber housing, the air chamber cover is arranged on the outside of the second air chamber housing, the first diaphragm is located between the second air chamber housing and the first air chamber housing, the second diaphragm is located between the air chamber cover and the second air chamber housing, one end of the negative pressure channel is connected to the second air chamber housing, and the other end of the negative pressure channel is connected to the intake channel.

2. The oil-gas automatic switching carburetor according to claim 1, characterized in that: A first chamber is formed between the first air chamber housing and the first diaphragm, a second chamber is formed between the first diaphragm and the second diaphragm, and the negative pressure channel is communicated with the second chamber.

3. The oil-gas automatic switching carburetor according to claim 2, characterized in that: An air inlet hole is provided on the second air chamber shell, the air inlet channel is communicated with the air inlet hole, and the air inlet hole is located in the second chamber.

4. The oil-gas automatic switching carburetor according to claim 3, characterized in that: The second air chamber housing is provided with a gas groove, the gas groove is communicated with the air inlet, and the gas groove is provided on a side opposite to the second diaphragm.

5. The oil-gas automatic switching carburetor according to claim 4, characterized in that: The cross-section of the gas groove is arc-shaped, and the gas inlet is connected to the middle of the gas groove.

6. The oil-gas automatic switching carburetor according to claim 2, characterized in that: The air chamber cover is provided with an air inlet, and the second diaphragm and the air chamber cover form a third chamber.

7. The oil-gas automatic switching carburetor according to claim 2, characterized in that: The second air chamber housing is provided with a vent hole, and the vent hole is communicated with the second chamber.

8. The oil-gas automatic switching carburetor according to any one of claims 1 to 7, characterized in that: A first ventilation joint is provided on the second air chamber shell, and the first ventilation joint is connected to the interior of the second air chamber shell. A second ventilation joint is provided on the carburetor body, and the second ventilation joint is connected to the intake channel. One end of the negative pressure channel is sealed with the first ventilation joint, and the other end of the negative pressure channel is sealed with the second ventilation joint.

9. The oil-gas automatic switching carburetor according to any one of claims 1 to 7, characterized in that: The surface area of ​​the second diaphragm is greater than the surface area of ​​the first diaphragm.

10. A carburetor system, characterized in that: It comprises the oil-gas automatic switching carburetor as claimed in any one of claims 1 to 9.

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