Novel check valve

Abstract

The utility model relates to a novel check valve which comprises a valve seat, a circulation channel facilitating medium circulation is arranged in the valve seat, the output end of the circulation channel is communicated with a valve cavity, and a sealing membrane used for sealing and covering an output port of the circulation channel is arranged in the valve cavity. The sealing membrane can be pushed by a medium to move in the medium conveying direction so as to open the output port of the circulation channel; a diaphragm retainer used for limiting the sealing diaphragm is arranged on the side, away from the circulation channel, of the valve cavity, and a medium output port facilitating medium output is formed in the middle of the diaphragm retainer. The sealing device is simple and reasonable in structural design, the requirement for machining precision is effectively lowered, the sealing end face is smooth and glossy, additional sealing performance detection is not needed, production time consumption is reduced, and production efficiency is improved.

Description

Technical field:

[0002] The utility model relates to a novel check valve. Background technology:

[0004] The two-stroke outboard engine is a vertical engine. Due to its own weight, the mixed gas settles to the lower crankcase, resulting in insufficient lubrication of the upper crankcase. This situation has the following problems: (1) It is easy to cause the engine bearings and cylinders to pull, shortening the engine life; (2) The two-stroke outboard engine multi-cylinder engine interferes with each other, causing unstable idle speed and easy idle flameout. The idle speed needs to be increased, but when shifting gears, the high speed causes gear shifting to be difficult and the gear shifting feels frustrating. In order to solve the above problems, a check valve is usually installed between the upper crankcase and the lower crankcase. The check valve prevents the oil and gas in the upper crankcase from settling in the lower crankcase, and part of the mixed gas in the lower crankcase is sucked into the upper crankcase, which makes the bearings and cylinders fully lubricated, prolonging the engine life. At the same time, the idle speed is adjusted to be 8-12% lower than the original speed, with the advantages of stable idle speed and no flameout.

[0005] At present, the check valve installed between the upper crankcase and the lower crankcase is composed of an angle valve seat, a nylon ball and a thickened retainer. This type of check valve has high requirements for processing accuracy (for example: valve seat angle and surface gloss guarantee, nylon ball roundness and surface gloss, etc., two accessories matching and sealing test requirements), which not only increases the production cost of the check valve, but also takes a long time to produce, affecting production efficiency. Therefore, it is necessary to improve this technical problem, and this case is born. Utility model content:

[0007] The utility model makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the utility model is to provide a new type of check valve with reasonable design and effective reduction of processing precision.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a new type of check valve, including a valve seat, a flow channel for facilitating the flow of medium is arranged inside the valve seat, the output end of the flow channel is connected to a valve cavity, a sealing diaphragm for sealing and covering the output port of the flow channel is arranged in the valve cavity, and the sealing diaphragm can move along the medium conveying direction under the push of the medium to open the output port of the flow channel; a diaphragm retainer for limiting the sealing diaphragm is arranged on the side of the valve cavity away from the flow channel, and the middle part of the diaphragm retainer has a medium output port for facilitating the output of the medium.

[0009] Furthermore, the diameter of the valve cavity is larger than the diameter of the circulation channel, and the step surface between the valve cavity and the circulation channel is provided with a docking flange protruding toward the side where the sealing diaphragm is located, and the docking flange is used to contact the sealing diaphragm.

[0010] Furthermore, the docking flange is in a ring shape and has an outer diameter smaller than the diameter of the sealing diaphragm, and an end of the docking flange close to the sealing diaphragm is provided with a docking plane for fitting with the sealing diaphragm.

[0011] Furthermore, the diaphragm retainer includes a ring-shaped retainer body, the inner hole of the retainer body is a medium outlet, and the medium outlet is directly opposite to the outlet of the flow channel.

[0012] Furthermore, a plurality of limit blocks are evenly distributed on the circumference of the medium outlet, and the limit blocks are bent toward the side where the sealing diaphragm is located and extend into the interior of the valve cavity.

[0013] Furthermore, the retainer body is arranged on an end face of the valve seat close to the medium outlet, and the end face of the valve seat close to the medium outlet is also provided with a ring-shaped limiting flange, which is located on the outside of the retainer body, and the limiting flange is bent inward and presses the retainer body.

[0014] Furthermore, the position where the limiting flange contacts the retaining frame body is riveted and fixed.

[0015] Furthermore, the diameter of the medium output port is smaller than the diameter of the sealing diaphragm; and the diameter of the circulation channel is smaller than the diameter of the sealing diaphragm.

[0016] Furthermore, the circulation channel, the valve chamber and the medium output port are coaxially distributed.

[0017] Compared with the prior art, the utility model has the following effects: the utility model has a simple and reasonable structural design, effectively reduces the requirements for processing accuracy, and the sealing end face is flat and glossy, does not require additional sealing detection, reduces production time, and improves production efficiency. Description of the drawings:

[0019] Figure 1 It is a schematic diagram of the main cross-sectional structure of an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the main cross-sectional structure of the valve seat in the embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the main structure of the diaphragm holder in the embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of the main structure of the sealing diaphragm in the embodiment of the utility model. Specific implementation method:

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] like Figures 1 to 4 As shown, the utility model is a new type of check valve, including a cylindrical valve seat 1, a flow channel 2 for medium circulation is arranged inside the valve seat 1, the output end of the flow channel 2 is connected to a valve cavity 3, a circular sealing diaphragm 4 for sealing and covering the output port of the flow channel 2 is arranged in the valve cavity 3, and the sealing diaphragm 4 can move (i.e., move) in the valve cavity 3 along the medium conveying direction under the push of the medium to open the output port of the flow channel 2; a diaphragm holder 5 for limiting the sealing diaphragm 4 is arranged on the side of the valve cavity 3 away from the flow channel 2, and the middle part of the diaphragm holder 5 has a medium output port 6 for medium output. The check valve has a simple structure, does not need to use structures such as angle valve seats and nylon balls, and effectively reduces the requirements for processing accuracy. When in use, the check valve is installed between the upper crankcase and the lower crankcase, with the input port of the circulation channel facing the lower crankcase and the medium output port facing the upper crankcase. Under normal conditions, the sealing diaphragm seals and covers the output port of the circulation channel, so that the oil and gas in the upper crankcase will not settle to the lower crankcase due to its own weight, while part of the mixed gas in the lower crankcase pushes the sealing diaphragm open due to suction, thereby opening the output port of the circulation channel, and then this part of the mixed gas is output from the medium output port to the upper crankcase. Since part of the mixed gas in the lower crankcase is sucked into the upper crankcase, the bearings and cylinders are fully lubricated to extend the life of the engine, and it has the advantages of stable idling and no flameout.

[0027] In this embodiment, the circulation channel 2 and the valve cavity 3 are both circular holes, and the diameter of the valve cavity 3 is larger than the diameter of the circulation channel 2, so that a step surface 7 is formed between the valve cavity and the circulation channel, and the step surface 7 between the valve cavity 3 and the circulation channel 2 is provided with a docking flange 8 protruding toward the side where the sealing diaphragm is located, and the docking flange 8 is used to contact the sealing diaphragm 4, so as to achieve a sealed cover on the circulation channel output port.

[0028] In this embodiment, the butt flange 8 is in an annular shape, the outer diameter of the butt flange 8 is smaller than the diameter of the sealing diaphragm 4, and one end of the butt flange 8 close to the sealing diaphragm 4 is provided with a butt plane 9 for fitting with the sealing diaphragm 4. The sealing end face is formed by butt joint.

[0029] In this embodiment, the diaphragm retainer 5 includes an annular retainer body 10, the inner hole of the retainer body 10 is the medium outlet 6, and the medium outlet 6 is directly opposite to the outlet of the circulation channel 2, that is, the outlet of the circulation channel, the sealing diaphragm and the medium outlet are directly opposite to each other.

[0030] In this embodiment, four stop blocks 11 are evenly distributed around the circumference of the medium outlet 6, and the four stop blocks 11 are all bent toward the side where the sealing diaphragm 4 is located. After being bent, the four stop blocks 4 extend into the valve cavity 3. The stop blocks are used to contact the sealing diaphragm to limit the sealing diaphragm. Preferably, one end of the stop block extending into the valve cavity is in an arc shape.

[0031] In this embodiment, the retainer body 10 is arranged on the end surface of the valve seat 1 close to the medium outlet 6, and the end surface of the valve seat 1 close to the medium outlet 6 is also provided with a circular ring-shaped limiting flange 12, and the limiting flange 12 is located on the outside of the retainer body 10. The limiting flange 12 is bent inward and pressed on the outer peripheral side end of the retainer body 10, so as to fix the retainer body.

[0032] In this embodiment, in order to improve the fixing effect, the position where the limiting flange 12 contacts the holder body 10 is riveted and fixed, so as to prevent the diaphragm holder from loosening and deforming.

[0033] In this embodiment, the diameter of the medium outlet 6 is smaller than the diameter of the sealing diaphragm 4 ; and the diameter of the flow channel 2 is smaller than the diameter of the sealing diaphragm 4 .

[0034] In this embodiment, the valve seat, the flow channel, the valve cavity and the medium output port are coaxially distributed.

[0035] The machining accuracy of the check valve is not high. As long as it meets the requirements of the drawings and use, and the sealing end face is flat and shiny, no additional sealing test is required. In actual use, by installing the check valve between the upper and lower crankcases, after 6 batches of it were provided to various OEMs for use, the feedback was that the idle speed was stable and 10%-15% lower than that without the check valve installed, and there was no sense of frustration when shifting gears; after 6 months of use, customers did not report cylinder pulling, etc., and the OEMs reported that it could meet the use requirements.

[0036] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).

[0037] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0038] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A novel check valve, comprising a valve seat, wherein a flow channel is provided inside the valve seat to facilitate the flow of a medium, and characterized in that: The output end of the circulation channel is connected to a valve cavity, in which a sealing diaphragm for sealing and covering the output port of the circulation channel is arranged. The sealing diaphragm can move along the medium conveying direction under the push of the medium to open the output port of the circulation channel; a diaphragm retainer for limiting the sealing diaphragm is arranged on the side of the valve cavity away from the circulation channel, and the middle part of the diaphragm retainer has a medium output port for facilitating the output of the medium.

2. A novel check valve according to claim 1, characterized in that: The diameter of the valve cavity is larger than the diameter of the circulation channel. The step surface between the valve cavity and the circulation channel is provided with a docking flange protruding toward the side where the sealing diaphragm is located. The docking flange is used to contact the sealing diaphragm.

3. A novel check valve according to claim 2, characterized in that: The butt joint flange is in a ring shape and has an outer diameter smaller than the diameter of the sealing diaphragm. An end of the butt joint flange close to the sealing diaphragm is provided with a butt joint plane for fitting with the sealing diaphragm.

4. A novel check valve according to claim 1, characterized in that: The diaphragm holder comprises a ring-shaped holder body, the inner hole of the holder body is a medium output port, and the medium output port is directly opposite to the output port of the circulation channel.

5. A novel check valve according to claim 4, characterized in that: A plurality of limit blocks are evenly distributed on the circumference of the medium output port, and the limit blocks are bent toward the side where the sealing diaphragm is located and extend into the interior of the valve cavity.

6. A novel check valve according to claim 4, characterized in that: The retainer body is arranged on an end surface of the valve seat close to the medium outlet, and the end surface of the valve seat close to the medium outlet is also provided with a ring-shaped limiting flange, which is located on the outside of the retainer body, and the limiting flange is bent inward and presses the retainer body.

7. A novel check valve according to claim 6, characterized in that: The position where the limiting flange contacts the retaining frame body is riveted and fixed.

8. A novel check valve according to claim 1, characterized in that: The diameter of the medium outlet is smaller than the diameter of the sealing diaphragm; the diameter of the flow channel is smaller than the diameter of the sealing diaphragm.

9. A novel check valve according to claim 1, characterized in that: The circulation channel, the valve cavity and the medium output port are coaxially distributed.

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