Ventilation cap

Abstract

The utility model discloses a ventilation cap, and relates to the technical field of ventilation, and the ventilation cap comprises an annular cylinder assembly, a sealing seat, a conical core, a first elastic piece and a second elastic piece; according to the ventilation cap, bidirectional circulation can be achieved, the function of balancing the pressure difference can be started only when the internal and external pressure difference exceeds a certain numerical value, on one hand, external impurities can be prevented from polluting the internal environment, and on the other hand, the situation of medium leakage can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ventilation, in particular to a ventilation cap. BACKGROUND

[0002] In mobile devices (such as cranes, excavators and other engineering machinery), a ventilation port is often arranged at an oil tank or other position, and a filter element is arranged at the ventilation port position, or the ventilation port position is designed to be in a semi-open state. The structure of arranging a filter element or being designed to be in a semi-open state may cause the oil tank to be contaminated or leaked. CONTENT OF THE UTILITY MODEL

[0003] The ventilation cap provided by the present application can realize bidirectional flow under a certain pressure and balance the internal and external pressure difference.

[0004] The present application provides a ventilation cap, which comprises a ring cylinder assembly sealing seat, a conical core, a first elastic element and a second elastic element. The inside of the ring cylinder assembly is provided with a transition cavity. The sealing seat is arranged in the transition cavity, and the sealing seat divides the transition cavity into a first sub-cavity and a second sub-cavity along a first direction. The ring cylinder assembly is provided with a first air hole communicating with the first sub-cavity and a second air hole communicating with the second sub-cavity. The sealing seat is provided with a central hole for communicating the first sub-cavity and the second sub-cavity. At least part of the inner circumferential surface of the central hole is configured as a first inner circumferential conical surface, and the outer circumferential surface of the sealing seat is configured as a first outer circumferential conical surface, which can be in contact with the ring cylinder assembly. The outer circumferential surface of the conical core can be in contact with the first inner circumferential conical surface. The first elastic element is arranged in the first sub-cavity, and the two ends of the first elastic element are respectively in abutment with the ring cylinder assembly and the sealing seat. The second elastic element is arranged in the second sub-cavity, and the two ends of the second elastic element are respectively in abutment with the ring cylinder assembly and the conical core. The extension directions of the first elastic element and the second elastic element are both configured as the first direction.

[0005] The ventilation cap provided by the present application has at least the following beneficial effects:

[0006] The breathable cap of the present application can be arranged at the breathable port position, wherein the second air hole of the breathable cap is in communication with the internal space, and the first air hole is in communication with the external space, when the air pressure of the internal space is greater than the air pressure of the external space by a certain value, the internal pressure pushes the sealing seat upward (at this time, the first elastic member is pressed), so that the first outer peripheral tapered surface of the sealing seat is separated from the contact with the annular cylinder assembly, and then a pressure relief gap is generated at the position of the first outer peripheral tapered surface, and the internal air pressure is discharged to the outside through the pressure relief gap, the first sub-cavity and the first air hole, thereby ensuring the safety and stability of the system, and when the external air pressure is greater than the internal air pressure by a certain value, the external pressure pushes the tapered core downward (at this time, the second elastic member is pressed), and the air filling gap is generated between the tapered core and the first inner peripheral tapered surface, and the external air pressure can enter the internal space through the air filling gap and the second air hole to ensure the stability of the structure; the breathable cap of the present application can realize bidirectional flow, and only when the internal and external pressure difference exceeds a certain value, the function of balancing the pressure difference can be opened, which can avoid the pollution of the external impurities to the internal environment on the one hand, and can avoid the medium leakage on the other hand. BRIEF DESCRIPTION OF DRAWINGS

[0007] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not considered a limitation of the present application. Moreover, like reference numerals are used to designate identical components throughout the specification. In the drawings:

[0008] Figure 1 is a cross-sectional view of the breathable cap of the present application;

[0009] Figure 2 is an isometric cross-sectional view of the breathable cap of the present application;

[0010] Figure 3 is an exploded view of the breathable cap of the present application;

[0011] The explanation of the reference numerals is as follows:

[0012] 100, annular cylinder assembly; 100a, transition cavity; 100b, first sub-cavity; 100c, second sub-cavity; 100d, first air hole; 100e, second air hole; 100f, second inner peripheral tapered surface; 110, annular cylinder; 111, second guide seat; 120, cap; 121, first guide seat; 130, connecting ring;

[0013] 200, sealing seat; 200a, center hole; 200b, first inner peripheral tapered surface; 200c, first outer peripheral tapered surface; 210, inner pressure plate; 220, first column part;

[0014] 300, tapered core; 300a, second outer peripheral tapered surface; 310, tapered part; 320, second column part;

[0015] 400, the first elastic member;

[0016] 500, the second elastic member. DETAILED DESCRIPTION

[0017] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. The following detailed description is merely intended to explain the present application, and is not intended to limit the present application. The present application can be implemented without some of the specific details, which are well known to those skilled in the art. The following description of the embodiments is merely provided to give a better understanding of the present application by showing examples of the present application.

[0018] It should be noted that the terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Also, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the processes, methods, articles or devices including the elements.

[0019] As shown in Figures 1 to 3 The present embodiment discloses a breather cap, which can be installed at a breather port position of a construction machine, the breather port position being an opening part of the construction machine (e.g., an oil tank of the construction machine) that communicates an internal space (e.g., an internal space of the oil tank) and an external space (i.e., an external environment), and the breather cap is used to seal the oil tank and balance the pressure difference between the internal and external spaces.

[0020] As shown in Figure 1 The breather cap of the present embodiment includes an annular barrel assembly 100, a sealing seat 200, a conical core 300, a first elastic member 400, and a second elastic member 500.

[0021] As shown in Figure 2As shown, the inner part of the annular cylinder assembly 100 is provided with a transition cavity 100a, and the sealing seat 200 is arranged in the transition cavity 100a, which divides the transition cavity 100a into two cavities distributed along the first direction, i.e., a first sub-cavity 100b and a second sub-cavity 100c. The sealing seat 200 can move up and down in the transition cavity 100a along the first direction. When the sealing seat 200 moves upward to a certain position, the first sub-cavity 100b and the second sub-cavity 100c can be communicated. When the sealing seat 200 abuts against the annular cylinder assembly 100, the edge position of the sealing seat 200 is tightly abutted with the annular cylinder assembly 100 and forms a sealed connection at the edge position. The annular cylinder assembly 100 is provided with a first gas hole 100d and a second gas hole 100e, respectively. The first gas hole 100d is communicated with the first sub-cavity 100b, and the second gas hole 100e is communicated with the second sub-cavity 100c. The external space can be communicated with the first sub-cavity 100b through the first gas hole 100d, and the internal space can be communicated with the second sub-cavity 100c through the second gas hole 100e.

[0022] As shown in Figure 1 The annular cylinder assembly 100 includes an annular cylinder 110 and a cap 120. The annular cylinder 110 is configured as a hollow cylinder with one end open. The cap 120 is arranged on the open end of the annular cylinder 110. The annular cylinder 110 is closed by the cap 120, so that the inner part of the annular cylinder 110 forms the transition cavity 100a. In this embodiment, the outer circumferential surface of the annular cylinder 110 is fixedly provided or integrally formed with a connecting ring 130. The connecting ring 130 is coaxially arranged with the annular cylinder 110. The connecting ring 130 is equidistantly provided with a plurality of connecting holes along the circumferential direction. The annular cylinder 110 is arranged on the external structure through the connecting holes, for example, the annular cylinder 110 is connected to the air vent position of the oil tank through the connecting holes. Along the first direction, one side of the connecting ring 130 is configured as the external space, and the other side of the connecting ring 130 is configured as the internal space. In some preferred embodiments, the inner periphery of the cap 120 is provided with an internal thread, and the outer periphery of the annular cylinder 110 is provided with an external thread. The cap 120 is screw-connected with the annular cylinder 110 through the internal thread. The screw connection has the following effects: on the one hand, it can facilitate disassembly and maintenance; on the other hand, the cap 120 can adjust the pre-pressing amount of the first elastic member 400 through the screw connection, so as to adjust the communication pressure between the internal and external spaces.

[0023] As shown in Figure 2 and Figure 3As shown, at least part of the outer circumferential surface of the sealing seat 200 is configured as a first outer circumferential taper surface 200c, which can be in close contact with the annular barrel assembly 100. When the first outer circumferential taper surface 200c is out of close contact with the annular barrel assembly 100, a pressure relief gap is generated between the first outer circumferential taper surface 200c and the annular barrel assembly 100, and the inner and outer spaces are in communication. Specifically, the inner circumferential surface of the annular barrel 110 is provided with a second inner circumferential taper surface 100f. Under normal circumstances, the first outer circumferential taper surface 200c can be in close contact with the second inner circumferential taper surface 100f under the action of the first elastic member 400, so that no pressure relief gap is generated at this position, and the close contact is maintained. When the internal pressure (e.g. thermal expansion) is greater than the external pressure by a certain value, the internal pressure pushes the sealing seat 200 upward and exerts pressure on the first elastic member 400, so that the first elastic member 400 is contracted, and the first outer circumferential taper surface 200c and the second inner circumferential taper surface 100f can slide relative to each other in the first direction, thereby generating a pressure relief gap and realizing the communication between the inner and outer spaces.

[0024] As shown in the drawings, Figure 3 The central hole 200a of the sealing seat 200 is coaxially arranged with the sealing seat 200, and at least part of the inner circumferential surface of the central hole 200a is configured as a first inner circumferential taper surface 200b. The outer circumferential surface of the taper core 300 can be in close contact with the first inner circumferential taper surface 200b in the first direction, thereby realizing the closure of the central hole 200a by the taper core 300. Specifically, under normal circumstances, the taper core 300 is in close contact with the first inner circumferential taper surface 200b under the action of the second elastic member 500, so that the first sub-cavity 100b and the second sub-cavity 100c cannot be communicated through the central hole 200a. When the external space pressure is greater than the internal space pressure by a certain value, the external pressure pushes the taper core 300 to move downward by a certain stroke, and the second elastic member 500 is compressed and contracted at this time. A gas charging gap is generated between the first inner circumferential taper surface 200b and the outer circumferential surface of the taper core 300, and the external environment is communicated to the second sub-cavity through the gas charging gap and then to the internal space. In some preferred embodiments, the outer circumferential surface of the taper core 300 is configured as a second outer circumferential taper surface 300a, which can be in close contact with the first inner circumferential taper surface 200b under the action of the second elastic member 500.

[0025] As shown in the drawings, Figure 3As shown in the drawings, in some preferred embodiments, the sealing seat 200 comprises an inner pressure plate 210 and a first column portion 220, the inner pressure plate 210 and the first column portion 220 are coaxially arranged, the connection between the inner pressure plate 210 and the first column portion 220 can be welding or one-piece forming or other existing fixed connection mode, the shape of the inner pressure plate 210 is circular, the outer circumference of the inner pressure plate 210 is provided with the first outer circumferential taper surface 200c, and the center hole 200a is communicated to the inner pressure plate 210 and the first column portion 220 along the first direction, the first inner circumferential taper surface 200b is arranged on the part of the inner pressure plate 210 corresponding to the center hole 200a, wherein at least part of the first elastic member 400 is coaxially sleeved on the first column portion 220, and the axial two ends of the first elastic member 400 are respectively abutted against the upper surface of the inner pressure plate 210 and the cap 120, and the expansion and contraction direction of the first elastic member 400 is arranged as the first direction. Here, the first column portion 220 can play a role in limiting the position of the first elastic member 400, so as to ensure the stable expansion and contraction of the first elastic member 400. It should be noted here that the number of the first gas holes 100d on the cap 120 is more than one, and at least one first gas hole 100d is coaxially communicated with the center hole 200a.

[0026] As shown in the drawings, Figure 3 In some preferred embodiments, the taper core 300 comprises a taper portion 310 and a second column portion 320, the taper portion 310 and the second column portion 320 are coaxially arranged, the connection between the taper portion 310 and the second column portion 320 can be welding or one-piece forming or other existing fixed connection mode, wherein the taper portion 310 is provided with the second outer circumferential taper surface 300a; the second elastic member 500 is coaxially sleeved on the second column portion 320 and abutted against the lower end surface of the taper portion 310. Here, the second column portion 320 can play a role in limiting the position of the second elastic member 500, so as to ensure the stable expansion and contraction of the second elastic member 500.

[0027] In the present embodiment, the first elastic member 400 and the second elastic member 500 are both arranged as springs, and the expansion and contraction directions of the first elastic member 400 and the second elastic member 500 are both arranged as the first direction.

[0028] As shown in the drawings, Figure 1As shown, in the embodiment, the inner top surface of the cap 120 is provided with a first guide seat 121, which can be welded or integrally formed with the cap 120, the first guide seat 121 is coaxially arranged with the cap 120, one end of the first elastic member 400 is located in the first guide seat 121, and at least part of the first elastic member 400 is accommodated in the first guide seat 121, the first guide seat 121 can play the functions of mounting and limiting the first elastic member 400. The inner bottom surface of the annular barrel 110 is provided with a second guide seat 111, which is coaxially arranged with the annular barrel 110, and can be welded or integrally formed with the annular barrel 110 or other existing connection modes, which are not limited in the embodiment, one end of the second elastic member 500 is located in the second guide seat 111, and at least part of the second elastic member 500 is accommodated in the second guide seat 111, the second guide seat 111 can play the functions of mounting and limiting the second elastic member 500.

[0029] In some preferred embodiments, at least part of the first column portion 220 is coaxially and slidably arranged in the first guide seat 121, the cooperation between the first column portion 220 and the first guide seat 121 can ensure the stability of the sealing seat 200 during the upward and downward movement, and at least part of the second column portion 320 is coaxially and slidably arranged in the second guide seat 111, the cooperation between the second column portion 320 and the second guide seat 111 can ensure the stability of the conical core 300 during the upward and downward movement.

[0030] The working principle of the breathable cap of the embodiment is as follows:

[0031] I. When the internal pressure is greater than the external pressure by a certain value (the specific value can be set by the pre-compression amount of the first elastic member 400), the pressure of the internal space drives the sealing seat 200 to move upward, at this time the first elastic member 400 is compressed and shrunk, the first outer peripheral conical surface 200c of the sealing seat 200 and the second inner peripheral conical surface 100f of the annular barrel 110 produce relative movement, and a pressure relief gap is generated at this position, the internal pressure is sequentially discharged outward through the pressure relief gap, the first sub-cavity 100b and the first gas hole 100d;

[0032] II. When the external pressure is greater than the internal pressure by a certain value (the specific value can be set by the pre-compression amount of the second elastic member 500), the pressure of the external environment drives the conical core 300 to move downward, at this time the second elastic member 500 is compressed, the second outer peripheral conical surface 300a of the conical core 300 and the first inner peripheral conical surface 200b produce relative movement, and an inflation gap is generated at this position, the external air pressure is sequentially charged to the internal space through the first gas hole 100d, the first sub-cavity 100b, the central hole 200a, the inflation gap, the second sub-cavity 100c and the second gas hole 100e, thereby realizing the balance of the internal and external pressure difference.

[0033] The above merely describes a specific implementation of the present application. Those skilled in the art can clearly understand the specific working processes of the system, modules and units described above for the convenience and brevity of description, and can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein again. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A breathable cap, characterized by, It includes an annular cylinder assembly (100), a sealing seat (200), a conical core (300), a first elastic element (400), and a second elastic element (500); The annular cylinder assembly (100) has a transition cavity (100a) inside; The sealing seat (200) is disposed in the transition cavity (100a), and the sealing seat (200) divides the transition cavity (100a) into a first sub-cavity (100b) and a second sub-cavity (100c) along a first direction; the annular cylinder assembly (100) is provided with a first vent (100d) communicating with the first sub-cavity (100b) and a second vent (100e) communicating with the second sub-cavity (100c); The sealing seat (200) is provided with a central hole (200a) for connecting the first sub-cavity (100b) and the second sub-cavity (100c). At least a portion of the inner circumferential surface of the central hole (200a) is configured as a first inner circumferential conical surface (200b), and the outer circumferential surface of the sealing seat (200) is configured as a first outer circumferential conical surface (200c). The first outer circumferential conical surface (200c) can be in contact with the annular cylinder assembly (100). The outer circumferential surface of the conical core (300) can be in contact with the first inner circumferential conical surface (200b). The first elastic element (400) is disposed in the first sub-cavity (100b), and the two ends of the first elastic element (400) abut against the annular cylinder assembly (100) and the sealing seat (200) respectively. The second elastic element (500) is disposed in the second sub-cavity (100c), and the two ends of the second elastic element (500) abut against the annular cylinder assembly (100) and the conical core (300) respectively. The extension and retraction directions of the first elastic element (400) and the second elastic element (500) are both configured as the first direction.

2. The breathable cap according to claim 1, characterized in that, The annular cylinder assembly (100) includes an annular cylinder (110) and a cap (120); the annular cylinder (110) is configured as a cylinder closed at one end, and the cap (120) is disposed at the open end of the annular cylinder (110) so that the transition cavity (100a) is formed inside the annular cylinder (110); the first vent (100d) is disposed on the cap (120); and the second vent (100e) is disposed on the outer periphery of the annular cylinder (110). The inner circumference of the annular cylinder (110) is provided with a second inner circumferential conical surface (100f) that is in contact with the first outer circumferential conical surface (200c); the outer circumference of the cone core (300) is provided with a second outer circumferential conical surface (300a) that is in contact with the first inner circumferential conical surface (200b); The two ends of the first elastic element (400) abut against the cap (120) and the sealing seat (200) respectively; the second elastic element (500) abuts against the annular cylinder (110) and the conical core (300) respectively.

3. The breathable cap according to claim 2, characterized in that, The annular cylinder (110) is threadedly connected to the cap (120).

4. The breathable cap according to claim 2, characterized in that, The annular cylinder (110) is provided with a connecting ring (130) on its outer periphery, and the connecting ring (130) is provided with a plurality of connecting holes for connecting to external structures along its circumference.

5. The breathable cap according to any one of claims 2 to 4, characterized in that, The sealing seat (200) includes an inner pressure plate (210) and a first column (220) coaxially connected, and the central hole (200a) is connected to the inner pressure plate (210) and the first column (220) along a first direction; a first inner peripheral conical surface (200b) is disposed on the inner pressure plate (210), and a first outer peripheral conical surface (200c) is disposed on the outer peripheral surface of the inner pressure plate (210); at least a portion of the first elastic element (400) is coaxially sleeved on the first column (220), and the first elastic element (400) abuts against the inner pressure plate (210).

6. The breathable cap according to claim 5, characterized in that, The conical core (300) includes a conical portion (310) and a second column portion (320) connected coaxially. The conical portion (310) is provided with a second outer peripheral conical surface (300a). A second elastic element (500) is coaxially sleeved on the second column portion (320) and the second elastic element (500) abuts against the end face of the conical portion (310).

7. The breathable cap according to claim 6, characterized in that, The cap (120) is provided with a first guide seat (121), and at least a portion of the first elastic element (400) is coaxially disposed in the first guide seat (121); the annular cylinder (110) is provided with a second guide seat (111), and at least a portion of the second elastic element (500) is disposed in the second guide seat (111).

8. The breathable cap according to claim 7, characterized in that, At least a portion of the first column (220) is slidably disposed coaxially within the first guide seat (121), and at least a portion of the second column (320) is slidably disposed coaxially within the second guide seat (111).

9. The breathable cap according to claim 7 or 8, characterized in that, Both the first elastic element (400) and the second elastic element (500) are configured as springs.

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