Exhaust valve and cooling pipe fitting with same

Abstract

An exhaust valve is used for solving the problem that working liquid easily leaks from an existing exhaust valve. Comprising a valve core which is provided with an exhaust inlet and an exhaust outlet, the valve core is provided with an air channel, the air channel is communicated with the exhaust inlet and the exhaust outlet, and a first sealing piece is arranged in the air channel; the sliding rod is located in the air channel, the sliding rod is provided with a first end and a second end which are axially opposite, the first end is provided with a second sealing piece, the second end is provided with a buoyancy piece, the buoyancy piece is close to the exhaust inlet, the second sealing piece is axially opposite to the first sealing piece, and the buoyancy piece is close to the exhaust inlet. The sliding rod enables the second sealing piece to abut against the first sealing piece in a displaceable mode in the air channel so as to seal the air channel between the exhaust inlet and the exhaust outlet. Therefore, the effect of preventing the working liquid from seeping from the exhaust valve can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a valve, especially an automatic opening and closing exhaust valve and a cooling pipe fitting with the exhaust valve. BACKGROUND

[0002] The exhaust valve is usually used to discharge gas in a container or a pipeline so as to maintain appropriate pressure in the container or the pipeline. For example, the exhaust valve can be installed in a pipeline inside a cooling device. When high-temperature working liquid flows into the pipeline, the gas generated by the high-temperature working liquid can be discharged by the exhaust valve, thereby avoiding the influence of the gas in the pipeline on the flow of the working liquid.

[0003] However, when a large amount of working liquid flows into the pipeline, the liquid level of the working liquid approaches the exhaust valve. If the exhaust valve does not timely form a closed state, the working liquid is likely to leak from the exhaust valve, and electronic equipment outside the pipeline is likely to be damaged by the leaked working liquid.

[0004] Therefore, the existing exhaust valve still needs to be improved. SUMMARY

[0005] To solve the above problems, the utility model aims at providing an exhaust valve and a cooling pipe fitting with the exhaust valve, which can avoid leakage of working liquid from the exhaust valve.

[0006] In the utility model, the directional or approximate terms such as "front", "back", "left", "right", "top", "bottom", "inside", "outside", "side", etc. are mainly referred to the directions of the attached drawings. The directional or approximate terms are only used to assist in the description and understanding of the embodiments of the utility model and are not used to limit the utility model.

[0007] In the utility model, the directional or approximate terms are only used to assist in the description and understanding of the embodiments of the utility model and are not used to limit the utility model.

[0008] In the utility model, the directional or approximate terms are only used to assist in the description and understanding of the embodiments of the utility model and are not used to limit the utility model.

[0009] The "combination", "combination" or "assembly" and other similar terms described in the whole text of the utility model mainly include the connection after the separation of the components or the connection after the components cannot be separated, and the skilled in the art can select according to the component material to be connected or assembly requirements.

[0010] The exhaust valve of the utility model, comprising: a valve core, having an exhaust inlet and an exhaust outlet, the valve core has an air passage, the air passage communicates the exhaust inlet and the exhaust outlet, the air passage has a first sealing element; a slide rod is located in the air passage, the slide rod has a first end and a second end axially opposite, the first end has a second sealing element, the second end has a buoyancy element, the buoyancy element is adjacent to the exhaust inlet, the second sealing element and the first sealing element are axially opposite, the slide rod can be displaced in the air passage to make the second sealing element and the first sealing element abut, to form the closure between the exhaust inlet and the exhaust outlet of the air passage; and a valve shell, the valve shell has a mounting hole, the valve core is located in the mounting hole.

[0011] Therefore, the exhaust valve of the utility model, through the slide rod can be axially displaced in the air passage, the slide rod can be pushed up along with the liquid level of the working liquid, so that the second sealing element of the slide rod and the first sealing element in the air passage can form a closure, and the slide rod can naturally fall down along with the liquid level of the working liquid under the gravity, and then the second sealing element of the slide rod and the first sealing element in the air passage can be far away, so that the exhaust valve can be closed when the liquid level of the working liquid is too high, and the effect of avoiding the working liquid from seeping out of the exhaust valve can be achieved.

[0012] The valve core has a first housing and a second housing, the first housing has a first opening and the exhaust inlet opposite to each other, the first opening and the exhaust inlet communicate a first channel of the first housing, the second housing has a second opening and the exhaust outlet opposite to each other, the second opening and the exhaust outlet communicate a second channel of the second housing, and the first channel and the second channel form the air passage. In this way, the air passage of the valve core can be formed by the first housing and the second housing, and the effect of facilitating the formation of the air passage is achieved.

[0013] The second housing has a combination part and an exhaust part, the second opening is located in the combination part, the exhaust outlet is located in the exhaust part, and the combination part is combined with the first channel of the first housing through the first opening of the first housing. In this way, the first channel of the first housing and the second channel of the second housing can be effectively communicated to form the air passage.

[0014] The exhaust part and the first opening have a sealing ring therebetween. In this way, the combination of the first housing and the second housing can have the effect of better air tightness.

[0015] The exhaust outlet is located on a groove bottom surface of the exhaust portion, a ring wall is surrounded on the groove bottom surface to form a space, and a cover is combined with the ring wall to cover the space. Thus, the cover can avoid the effect of dust and other foreign matters falling into the air passage from the exhaust outlet.

[0016] The exhaust portion has at least one communication hole, the valve housing has a plurality of exhaust passages, and the plurality of exhaust passages are located on the plurality of communication holes of the exhaust portion.

[0017] The air passage has a support portion, the support portion has at least one air hole and a through hole, the slide rod penetrates through the through hole, the slide rod has a ring protrusion between the first end and the second end, and the ring protrusion is used to support the support portion. Thus, the slide rod can be supported on the support portion through the ring protrusion to avoid the effect of the slide rod being pulled out of the air passage.

[0018] The first sealing member has a through hole, and the second sealing member is axially located on the through hole. Thus, the second sealing member can have the effect of forming good airtightness on the through hole.

[0019] The surface of the second sealing member towards the through hole is a curved surface. Thus, the second sealing member can have the effect of forming good airtightness on the through hole.

[0020] The buoyant member has at least one cavity. Thus, the buoyant member can have the effect of forming good buoyancy on water.

[0021] The buoyant member is tapered towards the second end. Thus, the buoyant member can reduce the shaking when it contacts the liquid surface, thereby having the effect of good floating stability.

[0022] A push rod is axially located on the slide rod in the air passage. Thus, the push rod can push the slide rod to separate the second sealing member from the first sealing member to maintain the normal exhaust effect of the exhaust valve.

[0023] The push rod has a first end and a second end opposite to each other, and a small diameter section between the first end and the second end, and the radial dimension of the small diameter section is smaller than the hole diameter of a through hole of the first sealing member. Thus, the small diameter section can penetrate the through hole to push the slide rod from the second end.

[0024] The radial section of the push rod and the radial section of the inner circumferential wall of the valve core are non-corresponding shapes, so that a gap is formed between the push rod and the inner circumferential wall of the valve core. Thus, the gas can be easily discharged from the exhaust outlet through the periphery of the push rod.

[0025] The valve core has a first shell and a second shell, the air passage penetrates the first shell and the second shell in the axial direction, the second shell has an exhaust part, the exhaust outlet is located on a groove bottom surface of the exhaust part, a ring wall is surrounded on the groove bottom surface to form a space, a cover is combined with the ring wall to cover the space, the cover has a through hole, and the push rod extends out of the through hole. In this way, the cover can prevent dust and other foreign matters from falling into the air passage through the exhaust outlet.

[0026] The outer peripheral wall of the push rod has a ring protrusion, and the ring protrusion is located in the space. In this way, the ring protrusion can prevent the push rod from being pulled out of the cover.

[0027] The two ends of the elastic member abut against the ring protrusion and the cover, respectively. In this way, the elastic reset of the elastic member can drive the push rod to abut against the sliding rod, and the second sealing member of the sliding rod can be separated from the first sealing member.

[0028] The cooling pipe fitting with the exhaust valve of the utility model comprises: a pipe wall surrounding a channel, the pipe wall having a connecting part; and the above-mentioned exhaust valve, the valve shell being connected to the connecting part to make the mounting hole and the channel of the pipe wall communicate with each other. In this way, the working liquid in the cooling pipe fitting can be prevented from leaking out of the exhaust valve. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 : exploded perspective view of the first embodiment of the utility model;

[0030] Figure 2 : schematic diagram of the first embodiment of the utility model for a cooling pipe fitting;

[0031] Figure 3 : cross-sectional view of the first embodiment of the utility model;

[0032] Figure 4 : air passage closure diagram as shown in Fig. 2; Figure 3

[0033] Figure 5 : exploded perspective view of another embodiment of the utility model;

[0034] Figure 6 : cross-sectional view as shown in Fig. 4. Figure 5

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 1: valve core

[0037] 1a: first shell

[0038] 1b: second shell

[0039] ​​11: exhaust gas inlet

[0040] 12: exhaust gas outlet

[0041] 13: first opening

[0042] 14: support portion

[0043] 141: vent hole

[0044] 142: through hole

[0045] 15: second opening

[0046] 16: coupling portion

[0047] 17: exhaust portion

[0048] 17a: slot bottom surface

[0049] 17b: ring wall

[0050] 17c: cover

[0051] 171: communication hole

[0052] 172: through hole

[0053] 173: dustproof member

[0054] 174: accommodating groove

[0055] 18: first sealing member

[0056] 181: through hole

[0057] 19: ring groove

[0058] 2: slide rod

[0059] 2a: first end

[0060] 2b: second end

[0061] 21: ring protrusion

[0062] 22: second sealing member

[0063] 23: buoyant member

[0064] 231: cavity

[0065] 3: push rod

[0066] 3a: first end

[0067] 3b: second end

[0068] 31: small-diameter section

[0069] 32: large diameter section

[0070] 33: shoulder

[0071] 34: ring protrusion

[0072] 35: elastic member

[0073] 4: valve housing

[0074] 41: mounting hole

[0075] 41a: opening

[0076] 42: exhaust passage

[0077] S: air passage

[0078] S1: first passage

[0079] S2: second passage

[0080] V: exhaust valve

[0081] O: sealing ring

[0082] R: space

[0083] T: cooling pipe

[0084] T1: pipe wall

[0085] T2: connecting portion

[0086] T3: passage DETAILED DESCRIPTION

[0087] In order to make the above and other objects, features and advantages of the present application more comprehensible, preferred embodiments of the present application will be described below in detail with reference to the accompanying drawings. In addition, the same reference numerals are used to denote the same components throughout the drawings, and the description thereof will be omitted.

[0088] Please refer to Figure 1 , Figure 2 , Figure 3 , which is a first embodiment of the exhaust valve V of the present application, comprising a valve core 1 and a slide rod 2, the slide rod 2 is displaceably penetrating in the valve core 1.

[0089] The valve core 1 has an exhaust inlet 11 and an exhaust outlet 12, which are located at opposite ends of the valve core 1. The valve core 1 has a gas passage S that connects the exhaust inlet 11 and the exhaust outlet 12, allowing gas to enter the gas passage S through the exhaust inlet 11 and exit through the exhaust outlet 12. In this embodiment, the valve core 1 may have a first housing 1a, with the exhaust inlet 11 located at one end of the first housing 1a. The first housing 1a may be generally cylindrical, providing an axially extending first channel S1. One end of the first housing 1a has a first opening 13, which, along with the exhaust inlet 11, is located at opposite ends of the first housing 1a and is axially connected to the first channel S1.

[0090] Furthermore, the first channel S1 of the first housing 1a may have a support portion 14, which may be located on the inner peripheral wall of the first housing 1a, between the first opening 13 and the exhaust inlet 11. Furthermore, the support portion 14 has at least one vent hole 141, which may penetrate through two opposing surfaces of the support portion 14, i.e., facing the two surfaces of the first opening 13 and the exhaust inlet 11 respectively, so that the first opening 13 and the exhaust inlet 11 can communicate through the at least one vent hole 141. The support portion 14 may also have a through hole 142, which penetrates through both surfaces of the support portion 14, for the slide rod 2 to pass through (described in detail later). In this embodiment, the through hole 142 may be located at the geometric center of the support portion 14, and several vent holes 141 may be arranged around the through hole 142.

[0091] The valve core 1 may have a second housing 1b, which has an axially extending second channel S2 connected to the first channel S1, such that the second channel S2 and the first channel S1 together form the air passage S. Specifically, the exhaust outlet 12 may be located in the second housing 1b, which also has a second opening 15. The second opening 15 and the exhaust outlet 12 may be located at opposite ends of the second housing 1b, and the second opening 15 and the exhaust outlet 12 are axially connected to the second channel S2.

[0092] In this embodiment, the second housing 1b may have a connecting portion 16 and an exhaust portion 17. The connecting portion 16 and the exhaust portion 17 are respectively located at opposite ends of the second housing 1b along its axial direction. The second opening 15 may be located at the connecting portion 16. The connecting portion 16 may be connected to the first channel S1 by the first opening 13 of the first housing 1a, and the exhaust portion 17 may abut against the first opening 13, so that the second opening 15 is located within the first channel S1, thereby connecting the first channel S1 and the second channel S2. Preferably, the exhaust portion 17 may abut against the first opening 13 by a sealing ring O to form a better sealing effect on the first opening 13.

[0093] The exhaust outlet 12 can be located in the exhaust section 17, which can be a groove. The exhaust outlet 12 can be located on the bottom surface 17a of the groove in the exhaust section 17. The exhaust section 17 can have a ring wall 17b surrounding the bottom surface 17a of the groove to form a space R. A cover 17c can be attached to the ring wall 17b to cover the space R. The cover 17c can be attached to the ring wall 17b by means of snap-fit, tight fit, or screwing. In this way, the cover 17c can prevent dust and other foreign objects from falling into the air passage S of the valve core 1 through the exhaust outlet 12. The exhaust section 17 can have at least one connecting channel 171 to allow the space R to communicate with the outside. The opening of the at least one connecting channel 171 can be located on the bottom surface 17a of the groove, the ring wall 17b, or the cover 17c. This utility model does not limit the location of the opening. Thus, the gas discharged from the exhaust outlet 12 can be discharged to the outside through the connecting passage 171.

[0094] The second housing 1b has a first seal 18 within its second channel S2. The first seal 18 is located between the exhaust outlet 12 and the second opening 15. The first seal 18 has a through hole 181 that connects to the second channel S2. Further, the first seal 18 can be made of a flexible material such as rubber, and it can be an annular shape. The through hole 181 is located at the geometric center of the first seal 18, allowing it to axially align with the second opening 15 and the exhaust outlet 12. Thus, the second opening 15 and the exhaust outlet 12 can communicate through the through hole 181. In this embodiment, the inner peripheral wall of the second housing 1b can have an annular groove 19, and the first seal 18 can be located within this groove, allowing it to be positioned within the second housing 1b.

[0095] The slide rod 2 is axially displaceable within the first channel S1. Furthermore, the slide rod 2 has a first end 2a and a second end 2b, and an annular protrusion 21 may be present between the first end 2a and the second end 2b. This annular protrusion 21 protrudes from the circumferential surface of the slide rod 2, and the slide rod 2 can axially extend through the through hole 142 of the support portion 14. Thus, the slide rod 2 can abut against the support portion 14 through the annular protrusion 21, preventing the slide rod 2 from dislodging from the first channel S1.

[0096] The first end 2a of the slide rod 2 can face the exhaust outlet 12. The first end 2a can have a second seal 22. The second seal 22 can contact the first seal 18 located in the second channel S2. When the slide rod 2 moves towards the first seal 18, the second seal 22 can contact the first seal 18 to seal the air passage S. Further, the second seal 22 is axially aligned with the through hole 181 of the first seal 18. The second seal 22 can be made of a flexible material such as rubber. The second seal 22 can be attached to the first end 2a by means of snap-fit, adhesive, or fitting. Preferably, the surface of the second seal 22 facing the through hole 181 can be curved. For example, the second seal 22 can be a sphere or a hemisphere. Thus, when the second seal 22 contacts the first seal 18, the second seal 22 can form a good seal over the through hole 181.

[0097] The second end 2b of the slide rod 2 can protrude from the exhaust inlet 11. The slide rod 2 has a buoyancy member 23, which can be located at the second end 2b. The buoyancy member 23 can be made of a low-density material such as polystyrene. Preferably, the buoyancy member 23 can have at least one cavity 231, so that the buoyancy member 23 can generate good buoyancy for the water. In this embodiment, the buoyancy member 23 can be tapered towards the second end 2b so that the buoyancy member 23 can be approximately conical. In this way, the buoyancy member 23 can reduce swaying when in contact with the liquid surface, thereby having good floating stability.

[0098] Please refer to Figure 1 , Figure 3 As shown, the exhaust valve V may further include a valve housing 4, which has a mounting hole 41 that extends through both ends of the valve housing 4 to form two openings 41a. The valve core 1 can be coupled to the mounting hole 41 by means of, for example, tight fitting, snap-fit, or screwing. The exhaust inlet 11 and the exhaust outlet 12 of the valve core 1 can respectively connect to the two openings 41a. In this embodiment, the valve core 1 can abut against the edge of the mounting hole 41 through the exhaust portion 17. The valve housing 4 may further have several exhaust channels 42, which can connect to several connecting channels 171 located in the exhaust portion 17.

[0099] Furthermore, the exhaust valve V can be used in a cooling pipe T. The pipe wall T1 of the cooling pipe T can have a connecting part T2. The connecting part T2 can be used to connect with the valve body 4 of the exhaust valve V. The connecting part T2 can protrude from the pipe wall T1, or the connecting part T2 can be non-protrudingly located in the pipe wall T1. For example, the connecting part T2 can be an opening or a screw hole, so that the mounting hole 41 of the valve body 4 can be connected to a channel T3 surrounded by the pipe wall T1, so that the air passage S of the valve core 1 can be connected to the channel T3. The channel T3 can be supplied with working fluids such as coolant.

[0100] Please refer to Figure 3 , Figure 4 As shown in detail, the slide rod 2 of the valve core 1 can slide down in the air passage S by gravity to abut against the support part 14 in the first channel S1. At this time, the second seal 22 of the slide rod 2 separates from the first seal 18 in the air passage S, making the air passage S unclosed. The gas generated by the working liquid in the cooling pipe T due to high temperature can enter the first channel S1 through the exhaust inlet 11 of the valve core 1, and flow into the second channel S2 through the vent hole 141 of the support part 14 before being discharged from the exhaust outlet 12. When the liquid level in the cooling pipe T rises, the liquid level of the working liquid can push the slide rod 2 up through the buoyancy member 23, so that the second seal 22 of the slide rod 2 comes into contact with the first seal 18 and closes the air passage S (second channel), thereby preventing the working liquid in the cooling pipe T from seeping out through the air passage S (second channel).

[0101] Please continue reading. Figure 1 , Figure 3 , Figure 4 As shown, preferably, the exhaust valve V of this utility model may further include a push rod 3, which is axially displaceable in the second channel S2 of the second housing 1b, and is axially opposed to the slide rod 2. Thus, the push rod 3 can be used to push the slide rod 2 to separate the second seal 22 from the first seal 18. Specifically, the push rod 3 has a first end 3a and a second end 3b opposite to each other, and a small-diameter section 31 may be present between the first end 3a and the second end 3b. The small-diameter section 31 may be adjacent to the second end 3b and can extend into the second channel S2. Preferably, the radial dimension of the small-diameter section 31 may be smaller than the diameter of the through hole 181 of the first seal 18, so that the small-diameter section 31 can extend through the through hole 181 to push the slide rod 2 by the second end 3b. There may be a large diameter section 32 between the first end 3a and the second end 3b. A shoulder 33 may be formed between the large diameter section 32 and the small diameter section 31 through a step difference. The push rod 3 may be supported against the exhaust outlet 12 through the shoulder 33.

[0102] Furthermore, the radial cross-section of the push rod 3 and the radial cross-section of the inner peripheral wall of the second housing 1b can be non-corresponding shapes. For example, when the radial cross-section of the push rod 3 is not a perfect circle, the radial cross-section of the inner peripheral wall of the second housing 1b is a perfect circle, thereby forming a gap between the push rod 3 and the inner peripheral wall of the second housing 1b. Alternatively, the peripheral wall of the push rod 3 can be recessed with a groove, so that gas can easily pass through the periphery of the push rod 3 and be discharged from the exhaust port 12.

[0103] In this embodiment, the cover 17c of the exhaust section 17 may have a through hole 172, through which the first end 3a of the push rod 3 may extend, so that the user can press the push rod 3 from outside the cover 17c to push against the slide rod 2. The outer peripheral wall of the push rod 3 may have an annular protrusion 34, which is located in the space R. The annular protrusion 34 may be integrally formed on the outer peripheral wall of the push rod 3, or the annular protrusion 34 may be detachably attached to the outer peripheral wall, thereby preventing the push rod 3 from coming out of the cover 17c. Preferably, the cover 17c may have a dustproof member 173, which may be an O-ring. The dustproof member 173 may be located in a receiving groove 174 adjacent to the through hole 172, so that the dustproof member 173 can further block the gap between the push rod 3 and the through hole 172, thereby having a better dustproof effect. Therefore, when the slide bar 2 does not slide down under gravity as expected, causing the second seal 22 to separate from the first seal 18, the user can manually press the push rod 3 to separate the second seal 22 from the first seal 18, thereby maintaining the normal venting of the exhaust valve V.

[0104] Please refer to Figure 5 , Figure 6 As shown, preferably, an elastic element 35 can be provided between the annular protrusion 34 of the push rod 3 and the inner surface of the cover 17c. The elastic element 35 can be a compression spring, and its two ends can respectively abut against the annular protrusion 34 and the cover 17c. In this way, the liquid level of the working fluid is raised by the buoyancy member 23, thereby pushing the push rod 3, causing the elastic element 35 to be compressed and elastically deformed. When the liquid level of the working fluid drops, the elastic restoring of the elastic element 35 can cause the push rod 3 to push against the slide rod 2, thereby ensuring that the second seal 22 of the slide rod 2 is separated from the first seal 18.

[0105] In summary, the exhaust valve and cooling pipe fitting of this utility model, through the slide rod, can be axially displaced within the air passage. The slide rod can be pushed upward with the liquid level of the working liquid, so that the second seal of the slide rod and the first seal in the air passage can form a seal. As the liquid level of the working liquid decreases, the slide rod falls naturally under gravity, thereby moving the second seal of the slide rod away from the first seal in the air passage. This allows the exhaust valve to close when the liquid level of the working liquid is too high, thus preventing the working liquid from leaking out of the exhaust valve.

[0106] Although the present invention has been disclosed using the above preferred embodiments, it is not intended to limit the present invention. Any modifications and alterations made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the technical scope protected by the present invention. Therefore, the protection scope of the present invention shall include all changes within the meaning and equivalent scope of the appended claims.

Claims

1. An exhaust valve characterized by, The valve core has a first housing and a second housing, the first housing has a first opening and the exhaust inlet opposite to each other, the first opening and the exhaust inlet communicate a first passage of the first housing, the second housing has a second opening and the exhaust outlet opposite to each other, the second opening and the exhaust outlet communicate a second passage of the second housing, the first passage and the second passage form the air passage. The second housing has a joint portion and an exhaust portion, the second opening is located at the joint portion, the exhaust outlet is located at the exhaust portion, the joint portion is combined with the first opening of the first housing to the first passage. The exhaust portion and the first opening have a sealing ring. The exhaust outlet is located at a groove bottom surface of the exhaust portion, a ring wall is surrounded at the groove bottom surface to form a space, a cover is combined with the ring wall to cover the space.

2. The exhaust valve of claim 1, wherein The exhaust portion has at least one communication hole, the valve housing has a plurality of exhaust passages, the plurality of exhaust passages are located at the plurality of communication holes of the exhaust portion.

3. The exhaust valve of claim 2, wherein, The air passage has a supporting portion, the supporting portion has at least one ventilation hole and a through hole, the slide rod penetrates through the through hole, the first end and the second end of the slide rod have a ring protrusion therebetween, the ring protrusion is used to support the supporting portion.

4. The exhaust valve of claim 3 wherein, The first seal has a through hole, the second seal is axially located at the through hole.

5. The exhaust valve of claim 4 wherein, The surface of the second seal towards the through hole is a curved surface.

6. The exhaust valve of claim 3 wherein, The buoyant member has at least one cavity.

7. The exhaust valve of claim 1 wherein, The buoyant member is tapered towards the second end.

8. The exhaust valve of claim 1 wherein, A push rod is axially located at the slide rod in the air passage.

9. The exhaust valve of claim 8 wherein, The push rod has a first end and a second end opposite to each other, a small diameter section is between the first end and the second end, the radial dimension of the small diameter section is smaller than the hole diameter of a through hole of the first seal.

10. The exhaust valve of claim 1 wherein, The radial section of the push rod and the radial section of the inner circumferential wall of the valve core are non-corresponding shapes, so that gaps are formed between the push rod and the inner circumferential wall of the valve core.

11. The exhaust valve of claim 1 wherein, The valve core has a first housing and a second housing, the air passage axially penetrates through the first housing and the second housing, the second housing has an exhaust portion, the exhaust outlet is located at a groove bottom surface of the exhaust portion, a ring wall is surrounded at the groove bottom surface to form a space, a cover is combined with the ring wall to cover the space, the cover has a through hole, the push rod extends out of the through hole.

12. The exhaust valve of claim 1 wherein, The outer circumferential wall of the push rod has a ring protrusion, the ring protrusion is located at the space.

13. The exhaust valve of claim 12, wherein, ​ 14. The exhaust valve of claim 12 wherein, ​ 15. The exhaust valve of claim 12 wherein, ​ 16. The exhaust valve of claim 15 wherein, ​ 17. The exhaust valve of claim 16 wherein, Two ends of the elastic member respectively abut against the ring protrusion and the cover body.

18. A cooling tube having a vent valve, characterized by, Comprising: A pipe wall surrounding a channel, the pipe wall having a connecting portion; and An exhaust valve according to any one of claims 1 to 17, the valve housing being connected to the connecting portion so that the mounting hole is in communication with the channel of the pipe wall.

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