Exhaust valve

Abstract

The utility model relates to the technical field of valves, and discloses an exhaust valve. The exhaust valve comprises a valve body and an exhaust assembly, wherein a valve cavity is formed in the valve body; the exhaust assembly comprises a valve seat, a valve needle and a reset spring, the valve seat is connected to the valve body, and an exhaust channel capable of being communicated with the valve cavity is formed in the valve seat. A first limiting groove is formed in the outer wall of the valve seat, a second limiting groove is formed in the outer wall of the valve needle, and the two ends of the reset spring abut against the first limiting groove and the second limiting groove respectively. The valve needle is adjustably arranged in the valve cavity so as to selectively open and close the inlet of the exhaust channel. The first limiting groove and the second limiting groove capable of limiting the two ends of the reset spring are formed in the valve seat and the valve needle correspondingly, the reset spring can be prevented from falling off from the valve seat or the valve needle when the valve needle deflects relative to the valve seat, and therefore the installation stability of the reset spring is guaranteed, normal exhaust of the exhaust valve is guaranteed, and the service life of the exhaust valve is prolonged. Therefore, the operation safety of each device is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an exhaust valve. Background Art

[0002] When the liquid inside the pipeline is flowing, the gas contained in the liquid will flow inside the pipeline along with the flow of the liquid and gradually accumulate at the highest point. The exhaust valve is usually arranged at the highest point or the local high point of the system pipeline, and is used to discharge the air existing in the pipeline, so as to prevent the pipeline from bursting.

[0003] The exhaust valve in the related art usually includes a valve body, an exhaust assembly and a float. Among them, an air inlet is arranged at the lower end of the valve body, and a mounting port is arranged at the upper end of the valve body. The float is movably arranged in the valve cavity of the valve body. The exhaust assembly includes a valve seat, a valve needle, a spring and a sealing plug. The valve seat is hermetically installed at the mounting port, and an exhaust passage communicating with the valve cavity of the valve body is arranged in the valve seat. Two ends of the spring are respectively screwed on the external threads of the valve seat and the valve needle. A sealing plug is arranged at one end of the valve needle facing the valve seat, and the valve needle abuts against the float. When the float moves downward, it can drive the valve needle to deflect downward relative to the valve seat, thereby driving the sealing plug to move, so as to open the inlet of the exhaust passage, so that the gas in the valve cavity of the valve body is discharged from the exhaust passage; after the gas in the valve body is discharged, the float can move upward. At this time, the valve needle can deflect upward relative to the valve seat under the action of the elastic restoring force of the spring, thereby driving the sealing plug to move to a position where the inlet of the exhaust passage is blocked, so as to avoid the leakage of the liquid in the valve cavity from the exhaust passage. However, in the actual use process, the spring is very easy to fall off from the valve needle or the valve seat due to the vibration of the equipment, so that the exhaust valve cannot exhaust normally, affecting the operation safety of other equipment.

[0004] Therefore, it is urgent to propose an exhaust valve to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an exhaust valve, which can prevent the spring from falling off from the valve needle or the valve seat due to the vibration of the equipment, so as to ensure that the exhaust valve can exhaust normally, and further ensure the operation safety of each equipment.

[0006] Based on the above concept, the technical solution adopted by the utility model is as follows:

[0007] An exhaust valve, comprising:

[0008] A valve body, which has a valve cavity therein;

[0009] The exhaust assembly includes a valve seat, a valve needle, and a return spring. The valve seat is connected to the valve body, and an exhaust passage communicating with the valve cavity is provided thereon. A first limiting groove is provided on the outer wall of the valve seat, a second limiting groove is provided on the outer wall of the valve needle, and both ends of the return spring are respectively abutted against the first limiting groove and the second limiting groove. The valve needle is adjustably arranged in the valve cavity to selectively open and close the inlet of the exhaust passage.

[0010] As a preferred solution of the exhaust valve provided by the present utility model, the groove wall of the first limiting groove close to the valve needle side is the first groove wall, the included angle between the first groove wall and the groove bottom of the first limiting groove is θ1, and 0° < θ1 ≤ 90°; and / or

[0011] The groove wall of the second limiting groove close to the valve seat side is the second groove wall, the included angle between the second groove wall and the groove bottom of the second limiting groove is θ2, and 0° < θ2 ≤ 90°.

[0012] As a preferred solution of the exhaust valve provided by the present utility model, the groove wall of the first limiting groove far from the valve needle side is the third groove wall, the included angle between the third groove wall and the groove bottom of the first limiting groove is θ3, and 0° < θ3 ≤ 90°.

[0013] As a preferred solution of the exhaust valve provided by the present utility model, θ1 is equal to or not equal to θ3.

[0014] As a preferred solution of the exhaust valve provided by the present utility model, a first external thread is provided on the outer wall of the valve seat, a second external thread is provided on the outer wall of the valve needle, and the middle part of the return spring is respectively screwed into the thread groove of the first external thread and the thread groove of the second external thread.

[0015] As a preferred solution of the exhaust valve provided by the present utility model, the groove depth of the first limiting groove is greater than or equal to the groove depth of the thread groove of the first external thread; and / or

[0016] The groove depth of the second limiting groove is greater than or equal to the groove depth of the thread groove of the second external thread.

[0017] As a preferred solution of the exhaust valve provided by the present utility model, the exhaust assembly further includes a blocking member, the blocking member is connected to one end of the valve needle close to the valve seat, and adjusting the valve needle can drive the blocking member to selectively block the inlet of the exhaust passage.

[0018] As a preferred solution of the exhaust valve provided by the present utility model, the valve needle includes:

[0019] A support portion, the support portion being in the shape of a stepped shaft, the large-diameter section of the support portion being arranged close to the valve seat, and the small-diameter section of the support portion being recessed relative to the large-diameter section of the support portion to form the second limiting groove;

[0020] A needle portion, connected to one end of the small-diameter section of the support portion away from the valve seat.

[0021] As a preferred solution of the exhaust valve provided by the present invention, a fillet transition is adopted between the end face of the valve seat close to the valve needle and its side surface; and / or

[0022] A fillet transition is adopted between the end face of the valve needle close to the valve seat and its side surface.

[0023] As a preferred solution of the exhaust valve provided by the present invention, a connection joint is formed at one end of the valve seat outside the valve body, and the connection joint is used to connect an external exhaust pipe.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention provides an exhaust valve. By respectively arranging a first limiting groove and a second limiting groove on the valve seat and the valve needle that can limit the two ends of the return spring, it can be avoided that when the valve needle deflects in position relative to the valve seat, the return spring falls off from the valve seat or the valve needle, thereby ensuring the installation stability of the return spring, and further ensuring that the exhaust valve can exhaust normally to ensure the safety of the operation of each device. Description of the Drawings

[0026] Figure 1 is a cross-sectional schematic view of the exhaust valve provided in the first embodiment of the present invention;

[0027] Figure 2 is a cross-sectional schematic view of the exhaust assembly provided in the first embodiment of the present invention;

[0028] Figure 3 is a structural schematic view of the first valve seat provided in the first embodiment of the present invention;

[0029] Figure 4 is a cross-sectional schematic view of the first valve seat provided in the first embodiment of the present invention;

[0030] Figure 5 is a structural schematic view of the second valve seat provided in the first embodiment of the present invention;

[0031] Figure 6 is a cross-sectional schematic view of the second valve seat provided in the first embodiment of the present invention;

[0032] Figure 7 is a structural schematic view of the first valve needle provided in the first embodiment of the present invention;

[0033] Figure 8 It is a cross-sectional schematic view of the first valve needle provided in the first embodiment of the present utility model;

[0034] Figure 9 It is a structural schematic view of the second valve needle provided in the first embodiment of the present utility model;

[0035] Figure 10 It is a cross-sectional schematic view of the second valve needle provided in the first embodiment of the present utility model;

[0036] Figure 11 is Figure 10 a partial structural schematic view of;

[0037] Figure 12 It is a cross-sectional schematic view of the exhaust assembly provided in the second embodiment of the present utility model.

[0038] In the figure:

[0039] 100, valve body; 1001, valve cavity; 110, valve main body; 120, valve cover; 121, mounting port;

[0040] 200, exhaust assembly; 210, valve seat; 211, exhaust passage; 212, first limiting groove; 2121, first groove wall; 2122, third groove wall; 213, first external thread; 214, first mounting groove; 215, second mounting groove; 220, valve needle; 221, support portion; 2211, second limiting groove; 22111, second groove wall; 2212, second external thread; 2213, receiving groove; 222, needle portion; 230, return spring; 240, plugging member; 250, end cover; 260, exhaust seal; 270, connection joint;

[0041] 300, float;

[0042] 400, connection seat; 401, sealing surface; 402, first convex structure;

[0043] 500, return seat; 501, intake passage; 502, intake port; 503, second convex structure;

[0044] 600, return member;

[0045] 701, first seal; 702, second seal; 703, third seal; 704, fourth seal; 705, fifth seal. Detailed implementation manners

[0046] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0047] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and to the right", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below and to the left", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0049] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0050] Embodiment 1

[0051] This embodiment provides an exhaust valve, which is applied in various pipelines and is used to discharge the gas in the pipeline to prevent the pipeline from bursting due to the excessive volume of gas in the pipeline.

[0052] Figure 1 The cross-sectional structural schematic diagram of the exhaust valve provided in this embodiment is shown. Figure 2 The cross-sectional structural schematic diagram of the exhaust assembly 200 provided in this embodiment is shown. As Figures 1 - 2As shown in the figure, this embodiment provides an exhaust valve, which includes a valve body 100 and an exhaust assembly 200. There is a valve cavity 1001 inside the valve body 100; the exhaust assembly 200 includes a valve seat 210, a valve needle 220 and a return spring 230. The valve seat 210 is connected to the valve body 100, and an exhaust passage 211 communicating with the valve cavity 1001 is provided thereon; a first limiting groove 212 is provided on the outer wall of the valve seat 210, and a second limiting groove 2211 is provided on the outer wall of the valve needle 220. The two ends of the return spring 230 are respectively abutted against the first limiting groove 212 and the second limiting groove 2211; the valve needle 220 is adjustably arranged in the valve cavity 1001 to selectively open and close the inlet of the exhaust passage 211. By respectively providing the first limiting groove 212 and the second limiting groove 2211 on the valve seat 210 and the valve needle 220 to limit the two ends of the return spring 230, it is possible to prevent the return spring 230 from falling off the valve seat 210 or the valve needle 220 when the valve needle 220 deflects relative to the valve seat 210, thereby ensuring the installation stability of the return spring 230, and further ensuring that the exhaust valve can exhaust normally to ensure the safety of the operation of each device.

[0053] To further improve the installation stability of the return spring 230, a first external thread 213 is provided on the outer wall of the valve seat 210, and a second external thread 2212 is provided on the outer wall of the valve needle 220. The middle part of the return spring 230 is respectively screwed into the thread groove of the first external thread 213 and the thread groove of the second external thread 2212. That is to say, in this embodiment, the return spring 230 includes a first end, a first intermediate connecting part, a second intermediate connecting part and a second end connected in sequence. Among them, the first end is limited in the first limiting groove 212, the first intermediate connecting part is screwed into the thread groove of the first external thread 213, the second intermediate connecting part is screwed into the thread groove of the second external thread 2212, and the second end is limited in the second limiting groove 2211, so as to realize the stable installation of the return spring 230 on the valve seat 210 and the valve needle 220.

[0054] It should be explained that, in this embodiment, the number of spring turns at the first end is about 1-2 turns, and the number of spring turns at the second end is about 1-2 turns. Of course, this embodiment does not limit the specific lengths of the first end, the first intermediate connecting part, the second intermediate connecting part and the second end, and the operator can adjust them according to actual installation needs.

[0055] Optionally, the depth of the first limiting groove 212 is greater than or equal to the depth of the thread groove of the first external thread 213, so as to ensure that there is sufficient space in the first limiting groove 212 to accommodate the first end of the return spring 230 and prevent it from disengaging from the first limiting groove 212. Optionally, the depth of the second limiting groove 2211 is greater than or equal to the depth of the thread groove of the second external thread 2212, so as to ensure that there is sufficient space in the second limiting groove 2211 to accommodate the second end of the return spring 230 and prevent it from disengaging from the second limiting groove 2211.

[0056] Figure 3 Fig. 4 shows a schematic structural view of the first valve seat 210 provided in this embodiment. Figure 4 Fig. 5 shows a schematic cross-sectional view of the first valve seat 210 provided in this embodiment. Figure 5 Fig. 8 shows a schematic structural view of the second valve seat 210 provided in this embodiment. Figure 6 Fig. 10 shows a schematic cross-sectional view of the second valve seat 210 provided in this embodiment. As Figures 3 - 6 and in combination with Figure 2 shown, the groove wall of the first limiting groove 212 close to the valve needle 220 is the first groove wall 2121, and the included angle between the first groove wall 2121 and the bottom of the first limiting groove 212 is θ1, and 0° < θ1 ≤ 90°. This design can prevent the return spring 230 from disengaging from the first limiting groove 212 along the inclined direction of the first groove wall 2121. Optionally, the groove wall of the first limiting groove 212 away from the valve needle 220 is the third groove wall 2122, and the included angle between the third groove wall 2122 and the bottom of the first limiting groove 212 is θ3, and 0° < θ3 ≤ 90°.

[0057] Specifically, in one embodiment, as Figures 3 - 4 shown, the included angle θ1 between the first groove wall 2121 and the bottom of the first limiting groove 212 is 90°, that is, the first groove wall 2121 is perpendicular to the bottom of the first limiting groove 212. This setting method can not only meet the stable limiting of the return spring 230 by the first limiting groove 212, but also facilitate the processing of the first limiting groove 212. In this example, the included angle θ3 between the third groove wall 2122 and the bottom of the first limiting groove 212 can also be set to 90°. At this time, the cross-sectional shape of the first limiting groove 212 is rectangular.

[0058] In another embodiment, as Figures 5 - 6As shown, the included angle θ1 between the first groove wall 2121 and the bottom of the first limiting groove 212 is an acute angle. This setting can form an angular structure between the first groove wall 2121 and the bottom of the first limiting groove 212, and this angular structure can also play a role in clamping the return spring 230, thereby further improving the limiting effect of the first limiting groove 212 on the return spring 230. In this example, the included angle θ3 between the third groove wall 2122 and the bottom of the first limiting groove 212 can also be set to 90°. At this time, the cross-sectional shape of the first limiting groove 212 is a right trapezoid.

[0059] In another embodiment, the included angle θ1 between the first groove wall 2121 and the bottom of the first limiting groove 212 is an acute angle, and the included angle θ3 between the third groove wall 2122 and the bottom of the first limiting groove 212 is also an acute angle. This setting can further improve the limiting effect of the first limiting groove 212 on the return spring 230. However, compared with the setting of the first limiting groove 212 with a rectangular cross-sectional shape, this setting method will increase the processing difficulty of the first limiting groove 212. Therefore, the designer can adjust the specific values of θ1 and θ3 according to actual needs, and this embodiment does not make any limitations in this regard.

[0060] Figure 7 Fig. shows the schematic structural diagram of the first valve needle 220 provided in this embodiment. Figure 8 Fig. shows the schematic cross-sectional view of the first valve needle 220 provided in this embodiment. Figure 9 Fig. shows the schematic structural diagram of the second valve needle 220 provided in this embodiment. Figure 10 Fig. shows the schematic cross-sectional view of the second valve needle 220 provided in this embodiment. As Figures 7 - 10 and in combination with Figure 2 shown, the groove wall of the second limiting groove 2211 close to the valve seat 210 is the second groove wall 22111, and the included angle between the second groove wall 22111 and the bottom of the second limiting groove 2211 is θ2, and 0° < θ2 ≤ 90°.

[0061] Specifically, in one embodiment, as Figures 7 - 8 shown, the included angle θ2 between the second groove wall 22111 and the bottom of the second limiting groove 2211 is θ2 = 90°, that is, the second groove wall 22111 is perpendicular to the bottom of the second limiting groove 2211. This setting method can not only ensure the stable limiting of the return spring 230 by the first limiting groove 212, but also facilitate the processing of the first limiting groove 212.

[0062] In another embodiment, as Figures 9 - 10As shown, the included angle θ2 between the second groove wall 22111 and the bottom of the second limiting groove 2211 is an acute angle. This setting method can form an angular structure between the second groove wall 22111 and the bottom of the second limiting groove 2211, and this angular structure can also play a role in clamping the return spring 230, thereby further improving the limiting effect of the second limiting groove 2211 on the return spring 230.

[0063] It should be noted that the specific values of θ1, θ2, and θ3 in this embodiment are not limited. The three can be all equal, or all unequal, or partially equal. This design requirement can reduce the machining accuracy of the valve seat 210 and the valve needle 220 to improve the machining efficiency.

[0064] To ensure that the valve needle 220 can effectively seal the inlet of the exhaust passage 211 in the blocking position, in this embodiment, as Figures 1 - 2 shown, the exhaust assembly 200 further includes a blocking member 240. The blocking member 240 is connected to one end of the valve needle 220 close to the valve seat 210. Adjusting the valve needle 220 can drive the blocking member 240 to selectively block the inlet of the exhaust passage 211. When the pipeline needs to exhaust, the valve needle 220 can be adjusted to the open position so that the blocking member 240 is away from the inlet of the exhaust passage 211, so that the valve cavity 1001 is connected to the exhaust passage 211, so that the gas in the valve cavity 1001 is discharged from the exhaust passage 211. When the exhaust is over, the valve needle 220 can be adjusted to the blocking position. At this time, the blocking member 240 can be tightly pressed against the inlet of the exhaust passage 211 under the elastic action of the return spring 230 to cut off the passage between the valve cavity 1001 and the exhaust passage 211 and prevent the liquid in the valve cavity 1001 from leaking.

[0065] Continuing as Figures 7 - 10 shown, in this embodiment, the valve needle 220 includes a support portion 221 and a needle portion 222. The support portion 221 is in the shape of a stepped shaft. The large-diameter section of the support portion 221 is arranged close to the valve seat 210. The small-diameter section of the support portion 221 is recessed relative to the large-diameter section of the support portion 221 to form the above-mentioned second limiting groove 2211, that is, the stepped surface between the small-diameter section and the large-diameter section of the support portion 221 forms the above-mentioned second groove wall 22111, and the outer surface of the small-diameter section of the support portion 221 forms the bottom of the second limiting groove 2211; the needle portion 222 is connected to one end of the small-diameter section of the support portion 221 away from the valve seat 210. Among them, the second external thread 2212 is arranged on the outer wall of the large-diameter section of the support portion 221. This setting method has a simple structure and is convenient for machining.

[0066] Optionally, a receiving groove 2213 is provided at one end of the supporting portion 221 close to the valve seat 210. The blocking member 240 is received in the receiving groove 2213 to achieve the installation of the blocking member 240. Further, the blocking member 240 is in interference fit with the receiving groove 2213 to prevent the blocking member 240 from falling off the valve needle 220 during operation. In this embodiment, the cross-section of the blocking member 240 is T-shaped. The small end of the blocking member 240 is received in the receiving groove 2213, and the large end of the blocking member 240 is used to block the inlet of the exhaust passage 211. Among them, the blocking member 240 is a rubber gasket, which has a good sealing effect and a low cost.

[0067] As Figures 1 - 2 shown, the exhaust valve further includes a float 300. The float 300 is movably disposed in the valve cavity 1001. One end of the valve needle 220 away from the valve seat 210 abuts against the float 300 and can be switched between a blocking position and an open position under the floating action of the float 300. When the valve needle 220 is in the blocking position, the blocking member 240 presses tightly against the inlet of the exhaust passage 211. When the valve needle 220 is in the open position, the blocking member 240 is spaced from the inlet of the exhaust passage 211. When there is gas overflow in the pipeline, the gas will flow along with the liquid and gather at the highest point of the pipeline (i.e., the position where the exhaust valve is installed). After the gas enters the valve cavity 1001 of the valve body 100, it can pass through the gap between the valve cavity 1001 of the valve body 100 and the float 300 and flow to the upper side of the float 300. As the gas above the float 300 increases and the pressure increases, the liquid level in the valve cavity 1001 drops, and the float 300 floats downward with the drop of the liquid level, thereby driving the valve needle 220 and the blocking member 240 connected thereto to rotate relative to the valve seat 210, so as to switch to the open position, that is, there is a gap between the blocking member 240 and the inlet of the exhaust passage 211. At this time, the gas located above the float 300 can be discharged through the exhaust passage 211. After the gas is exhausted, the liquid level in the valve cavity 1001 rises, the float 300 rises under the action of buoyancy, and the valve needle 220 can be reset under the elastic action of the return spring 230 to switch to the blocking position, that is, the blocking member 240 presses tightly against the inlet of the exhaust passage 211 to cut off the passage between the exhaust passage 211 and the valve cavity 1001 and prevent the liquid in the pipeline from leaking through the exhaust passage 211. The setting of the return spring 230 can provide a restoring force for the valve needle 220 after the exhaust is completed, so that the valve needle 220 is reset, and the blocking member 240 is closely attached to the valve seat 210 to effectively block the inlet of the exhaust passage 211.

[0068] It should be noted that the float 300 belongs to a relatively mature technology in the prior art, and the specific structure of the float 300 will not be described in detail in this embodiment.

[0069] It can be understood that when the valve needle 220 is in the open position, the return spring 230 will bend relative to its own axis. When the valve needle 220 switches from the open position to the blocking position, the return spring 230 drives the valve needle 220 to reset under the action of its own restoring force. At this time, the part of the return spring 230 located between the valve needle 220 and the valve seat 210 is easily stuck at the end of the valve needle 220 or the end of the valve seat 210, thereby affecting the normal operation of the exhaust valve. To solve this problem, as Figure 3 and Figure 7 shown, a rounded corner transition is adopted between the end face of the valve seat 210 close to the valve needle 220 and its side surface; a rounded corner transition is adopted between the end face of the valve needle 220 close to the valve seat 210 and its side surface. With this setting method, when the valve needle 220 switches from the open position to the blocking position, the part of the return spring 230 located between the valve needle 220 and the valve seat 210 can be smoothly reset along the rounded corner position of the valve seat 210 and the rounded corner position of the valve needle 220.

[0070] Continuing as Figure 1 and Figure 2 shown, the exhaust assembly 200 further includes an end cap 250 and an exhaust seal 260 disposed inside the end cap 250. An exhaust hole (not shown in the figure) that can communicate with the outlet of the exhaust passage 211 is provided on the end cap 250. The end cap 250 is movably disposed at one end of the valve seat 210 outside the valve body 100 and can be switched between an exhaust position and a sealing position; when the end cap 250 is in the exhaust position, the exhaust seal 260 is spaced from the outlet of the exhaust passage 211, and the outlet of the exhaust passage 211 is communicated with the exhaust hole on the end cap 250, so that the exhaust valve can exhaust normally; when a leak occurs at the exhaust hole due to a failure of the exhaust valve, the operator can adjust the end cap 250 to the sealing position. At this time, the exhaust seal 260 presses against the outlet of the exhaust passage 211. At this time, the exhaust valve acts as a plug to prevent the liquid in the pipeline from leaking from the exhaust hole of the end cap 250 after passing through the exhaust passage 211. In this embodiment, the end cap 250 is threadedly connected to the valve seat 210, so that the movement of the end cap 250 relative to the valve seat 210 can be realized by a simple screwing action, thereby achieving the effect of switching between the exhaust position and the sealing position.

[0071] Optionally, an installation port 121 communicating with the valve cavity 1001 is further provided on the valve body 100, and the valve seat 210 is sealingly connected to the installation port 121 to prevent the liquid in the valve cavity 1001 from leaking through the gap between the valve seat 210 and the installation port 121. In this embodiment, the valve seat 210 is threadedly connected to the installation port 121, and the threaded connection has the advantages of simple processing and convenient disassembly and assembly. Specifically, the installation port 121 is a stepped hole, the large-diameter end of the stepped installation port 121 is arranged outward, and an internal installation thread is provided on the inner wall of the large-diameter end of the installation port 121, and an external installation thread that is threadedly engaged with the internal installation thread is provided on the outer wall of the valve seat 210.

[0072] To achieve the sealing connection between the valve seat 210 and the installation port 121, a first sealing member 701 is provided between the stepped surface of the installation port 121 and the valve seat 210. Optionally, a first installation groove 214 for installing the first sealing member 701 is further provided on the valve seat 210 to achieve the stable installation of the first sealing member 701. Further, a second sealing member 702 is further provided between the small-diameter end of the installation port 121 and the valve seat 210 to further improve the sealing effect between the valve seat 210 and the installation port 121. Optionally, a second installation groove 215 for installing the second sealing member 702 is further provided on the valve seat 210 to achieve the stable fixation of the second sealing member 702.

[0073] Figure 11 shows Figure 10 a partial structural schematic diagram of. As Figure 11 and in combination with Figure 1 shown, the exhaust valve further includes a connection seat 400, a return seat 500, and a return member 600. The connection seat 400 is sleeved on the bottom of the valve body 100; the return seat 500 passes through the connection seat 400 and can abut against the bottom of the valve body 100. An intake passage 501 communicating with the valve cavity 1001 of the valve body 100 is provided in the return seat 500, and an intake port 502 communicating with the intake passage 501 is provided on the side wall of the return seat 500; the return member 600 is provided between the connection seat 400 and the return seat 500, and both ends of the return member 600 are respectively connected to the connection seat 400 and the return seat 500. When the exhaust valve needs to be used on the corresponding equipment, the connection seat 400 is used to connect the equipment installation position, the return seat 500 can partially extend into the pipeline, and the gas in the pipeline can flow into the intake passage 501 from the intake port 502 provided on the return seat 500, and then enter the valve cavity 1001 of the valve body 100. When the exhaust valve fails and the valve body 100 needs to be removed from the connection seat 400, the return seat 500 can move upward under the elastic action of the return member 600 so that the return seat 500 disengages from the pipeline, preventing the liquid in the pipeline from leaking from the return seat 500 and the connection seat 400.

[0074] Optionally, a third seal 703 is sleeved on the return seat 500. The air inlet 502 is located between the third seal 703 and the valve body 100. A sealing surface 401 that can be in sealing cooperation with the third seal 703 is provided at the bottom of the connection seat 400. When the valve body 100 is removed from the connection seat 400, the third seal 703 can be in sealing cooperation with the sealing surface 401 at the bottom of the connection seat 400, further preventing the liquid in the pipeline from leaking. Optionally, the inner diameter of the sealing surface 401 increases successively from top to bottom. On the one hand, it is used to cooperate with the third seal 703 to achieve the seal between the connection seat 400 and the return seat 500. On the other hand, it can also limit the return seat 500 to prevent it from disengaging from the upper end of the connection seat 400 under the elastic action of the return member 600.

[0075] Optionally, the return member 600 is a spring. The spring has a large restoring force and is convenient to obtain materials, which can reduce the processing cost. In this embodiment, a first convex structure 402 protrudes inward from the inner wall of the connection seat 400, and a second convex structure 503 protrudes outward from the outer wall of the return seat 500. The second convex structure 503 is located above the first convex structure 402. Both ends of the return member 600 are respectively abutted against the first convex structure 402 and the second convex structure 503.

[0076] Continue as Figure 1 and Figure 11 shown, the valve body 100 includes a valve main body 110 and a valve cover 120 installed on the valve main body 110. The bottom of the valve main body 110 is connected to the connection seat 400, and an installation port 121 is opened on the valve cover 120. In this embodiment, the connection seat 400 is threadedly connected to the valve main body 110, and a fourth seal 704 is further provided between the connection seat 400 and the valve main body 110 to achieve a sealed connection between the two and prevent the liquid in the pipeline from leaking from the gap between the connection seat 400 and the valve main body 110.

[0077] Optionally, the valve cover 120 is threadedly connected to the valve main body 110, and a fifth seal 705 is provided between the valve cover 120 and the valve main body 110 to achieve a sealed connection between the two and prevent the liquid in the pipeline from leaking from the gap between the valve cover 120 and the valve main body 110.

[0078] Next, in combination with Figures 1 - 11 briefly describe the working principle of this exhaust valve:

[0079] 1) When there is gas overflow in the pipeline, the gas will flow along with the liquid and gather at the highest point of the pipeline (i.e., the position where the exhaust valve is set). After the gas enters the valve cavity 1001 of the valve body 100, it can pass through the gap between the valve cavity 1001 of the valve body 100 and the float 300 and flow to the upper part of the float 300. As the gas above the float 300 increases, the pressure increases, the liquid level in the valve cavity 1001 drops, and the float 300 floats downward with the liquid level drop, thereby driving the valve needle 220 and the sealing member 240 connected thereto to rotate relative to the valve seat 210, so as to switch to the open position. The gas located above the float 300 can then be discharged from the exhaust hole of the end cover 250 through the exhaust passage 211; after the gas is exhausted, the liquid level in the valve cavity 1001 rises, the float 300 rises under the action of buoyancy, and the valve needle 220 can be reset under the elastic action of the return spring 230 to switch to the sealing position, cutting off the passage between the exhaust passage 211 and the valve cavity 1001 of the valve body 100, and preventing the liquid in the pipeline from leaking from the exhaust hole of the end cover 250 through the exhaust passage 211.

[0080] 2) When negative pressure is generated in the pipeline, the liquid level in the valve cavity 1001 of the valve body 100 drops, and the float 300 floats downward with the liquid level drop, thereby driving the valve needle 220 and the sealing member 240 connected thereto to rotate relative to the valve seat 210, so as to switch to the open position. Since the external atmospheric pressure is greater than the pressure in the pipeline at this time, the atmosphere will enter the valve cavity 1001 through the exhaust hole of the end cover 250; when the pressure in the pipeline returns to normal, the liquid level in the valve cavity 1001 rises, the float 300 rises under the action of buoyancy, and the valve needle 220 can be reset under the elastic action of the return spring 230 to switch to the sealing position, cutting off the passage between the exhaust passage 211 and the valve cavity 1001 of the valve body 100, and preventing the liquid in the pipeline from leaking from the exhaust hole of the end cover 250 through the exhaust passage 211.

[0081] 3) When the exhaust valve fails and causes leakage at the exhaust hole of the end cover 250, the operator can adjust the end cover 250 to the sealing position so that the exhaust seal 260 presses tightly against the outlet of the exhaust passage 211. At this time, the exhaust valve acts as a plug to prevent the liquid in the pipeline from leaking from the exhaust hole of the end cover 250 through the exhaust passage 211.

[0082] Embodiment 2

[0083] This embodiment provides an exhaust valve. The specific structure of this exhaust valve is substantially the same as that of the exhaust valve in Embodiment 1, except that: the structure of the valve seat 210 is different.

[0084] Figure 12 Shows a cross-sectional schematic view of the exhaust assembly 200 provided in this embodiment. As Figure 12 And in combination with Figure 1As shown, in this embodiment, the exhaust assembly 200 does not include an end cap 250 and an exhaust seal 260. The portion of the valve seat 210 located outside the valve body 100 forms a connection joint 270 for connecting to an external exhaust pipe, so that the gas in the valve cavity 1001 of the valve body 100 can be discharged from the external exhaust pipe after passing through the exhaust passage 211 of the valve seat 210. When a fault occurs in the exhaust valve, the exhaust valve can be closed by closing the on-off valve on the external exhaust pipe. By integrally forming the connection joint 270 on the valve seat 210, the setting of an additional joint can be omitted, the leakage points between the valve seat 210 and the connection joint 270 are reduced, and the structural length of the exhaust valve can be reduced to a certain extent.

[0085] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention has various changes and modifications, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust valve, characterized in that: include: A valve body (100), wherein the valve body (100) has a valve cavity (1001); An exhaust assembly (200) comprises a valve seat (210), a valve needle (220) and a return spring (230); the valve seat (210) is connected to the valve body (100) and is provided with an exhaust passage (211) which can communicate with the valve cavity (1001); a first limiting groove (212) is provided on the outer wall of the valve seat (210), and a second limiting groove (2211) is provided on the outer wall of the valve needle (220); two ends of the return spring (230) are respectively pressed against the first limiting groove (212) and the second limiting groove (2211); the valve needle (220) is adjustably arranged in the valve cavity (1001) to selectively open and close the inlet of the exhaust passage (211).

2. The exhaust valve according to claim 1, characterized in that: The groove wall of the first limiting groove (212) on the side close to the valve needle (220) is a first groove wall (2121), and the angle between the first groove wall (2121) and the groove bottom of the first limiting groove (212) is θ1, and 0°<θ1≤90°; and / or The groove wall of the second limiting groove (2211) close to the valve seat (210) is the second groove wall (22111), and the angle between the second groove wall (22111) and the groove bottom of the second limiting groove (2211) is θ2, and 0°<θ2≤90°.

3. The exhaust valve according to claim 2, characterized in that: The groove wall of the first limiting groove (212) away from the valve needle (220) is a third groove wall (2122), and the angle between the third groove wall (2122) and the groove bottom of the first limiting groove (212) is θ3, and 0°<θ3≤90°.

4. The exhaust valve according to claim 3, characterized in that: The θ1 and the θ3 are equal or unequal.

5. The exhaust valve according to claim 1, characterized in that: A first external thread (213) is provided on the outer wall of the valve seat (210), a second external thread (2212) is provided on the outer wall of the valve needle (220), and the middle part of the return spring (230) is screwed into the thread groove of the first external thread (213) and the thread groove of the second external thread (2212) respectively.

6. The exhaust valve according to claim 5, characterized in that The groove depth of the first limiting groove (212) is greater than or equal to the groove depth of the thread groove of the first external thread (213); and / or The groove depth of the second limiting groove (2211) is greater than or equal to the groove depth of the thread groove of the second external thread (2212).

7. The exhaust valve according to claim 1, characterized in that The exhaust assembly (200) further comprises a blocking member (240), wherein the blocking member (240) is connected to one end of the valve needle (220) close to the valve seat (210), and adjustment of the valve needle (220) can drive the blocking member (240) to selectively block the inlet of the exhaust channel (211).

8. The exhaust valve according to claim 1, characterized in that The valve needle (220) comprises: A support portion (221), the support portion (221) being in the shape of a stepped shaft, the large diameter section of the support portion (221) being arranged close to the valve seat (210), and the small diameter section of the support portion (221) being recessed relative to the large diameter section of the support portion (221) to form the second limiting groove (2211); The needle portion (222) is connected to an end of the small diameter section of the support portion (221) away from the valve seat (210).

9. The exhaust valve according to claim 1, characterized in that: A rounded transition is adopted between the end surface of the valve seat (210) close to the valve needle (220) and its side surface; and / or A rounded transition is adopted between the end surface of the valve needle (220) close to the valve seat (210) and the side surface thereof.

10. The exhaust valve according to any one of claims 1 to 9, characterized in that: One end of the valve seat (210) located outside the valve body (100) forms a connecting joint (270), and the connecting joint (270) is used to connect to an external exhaust pipeline.

Images