Internal discharge breathing type electromagnetic valve capable of preventing external impurities

Abstract

The utility model discloses an internal discharge breathing type electromagnetic valve capable of preventing external impurities. The internal discharge breathing type electromagnetic valve comprises a valve body and a gas internal discharge valve rod, a movable cavity is formed in the valve body in the length direction of the valve body, and an external exhaust hole is formed in the position, corresponding to the movable cavity, of the outer surface of the valve body. The gas inner exhaust valve rod is movably arranged in the movable cavity and arranged along the movable cavity, and an inner exhaust channel is formed in the position, corresponding to the outer exhaust hole, of the end of the gas inner exhaust valve rod; the gas internal exhaust valve rod is used for exhausting internal gas out of the valve body from the external exhaust hole through the internal exhaust channel during reversing action in the movable cavity; according to the utility model, a valve rod integrated exhaust system can be adopted, a rainwater infiltration path is effectively blocked, and an exhaust channel and a valve rod movement mechanism are ingeniously combined on the basis of maintaining the original boundary dimension, so that the smoothness of a gas path of a reversing action is ensured, a jamming fault caused by invasion of external pollutants is avoided, and the service life of the reversing valve is prolonged. And the device is particularly suitable for rainy, humid and dust-pervasive harsh environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to solenoid valve field especially is related to a kind of internal exhaust breathing formula solenoid valve of preventing external impurities. BACKGROUND

[0002] As the core execution element of fluid control system, the working reliability of solenoid valve directly affects the running stability of industrial equipment;In pneumatic control system, piston solenoid valve realizes gas path switching by electromagnetic force driving spool displacement, and the reciprocating motion of piston must rely on breathing hole to complete the dynamic balance of gas: when piston pushes out, discharge compressed gas, and when reset, inhale external air to form pressure difference driving mechanism action. Traditional solenoid valve generally adopts planar breathing hole design, which has the characteristics of convenient processing and high exhaust efficiency, and can be directly communicated with atmosphere through surface hole of valve body.

[0003] However, this open exhaust structure has significant defects in practical application: first, in the harsh working conditions of high dust concentration in mines, metallurgy and other industries, the exposed breathing hole is easy to become a channel for pollutants to invade, causing particle deposition in the valve body cavity, blocking the piston and other failures, which seriously affects the service life of solenoid valve;Second, in the food, medicine and other industries with strict cleanliness requirements, open exhaust may cause cross contamination risk;More importantly, in explosion-proof equipment, sealed space or dangerous environment with flammable gas, direct external exhaust not only has safety hazards, but also may violate relevant industry standards.

[0004] To solve the above problems, the prior art mostly adopts 2-position 2-way direct-acting solenoid valve structure, which realizes gas pressure balance by canceling the independent breathing hole design and using the internal flow passage of valve body;But this design has problems such as reduced response speed and increased design cost, and cannot completely avoid the potential leakage risk caused by seal wear.

[0005] In summary, the current industry urgently needs a new breathing system solution that can effectively isolate external pollutants and maintain the required gas pressure balance for piston movement, especially in complex working conditions that require explosion-proof, clean and long service life, and traditional technical solutions have been difficult to meet the needs of modern industrial development. UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to provide a kind of internal exhaust breathing formula solenoid valve of preventing external impurities, to further solve all the above problems or one of the problems existing in the prior art.

[0007] To solve the above technical problems, one technical scheme of the utility model is to provide a kind of internal exhaust breathing formula solenoid valve of preventing external impurities, comprising:

[0008] Valve body and gas internal exhaust valve rod;

[0009] The valve body is internally provided with a movable cavity along the length direction of the valve body, and the outer surface of the valve body is provided with an external exhaust hole corresponding to the position of the movable cavity;

[0010] The gas internal exhaust valve rod is movably arranged in the movable cavity, and the gas internal exhaust valve rod is arranged along the movable cavity, and the end of the gas internal exhaust valve rod is provided with an internal exhaust passage corresponding to the position of the external exhaust hole; the gas internal exhaust valve rod is used to exhaust the internal gas from the external exhaust hole outside the valve body through the internal exhaust passage when the reversing action in the movable cavity is performed.

[0011] As an improved scheme, the external exhaust hole is arranged on the lower surface of the valve body and close to the end of the valve body, the internal exhaust passage is arranged on the end of the gas internal exhaust valve rod and corresponds to the position of the external exhaust hole, and the internal exhaust passage is arranged in communication with the external exhaust hole.

[0012] As an improved scheme, the external exhaust hole is at least two, the internal exhaust passage is at least two, and the internal exhaust passage is arranged in one-to-one correspondence with the external exhaust hole;

[0013] Two external exhaust holes are arranged on the lower surface of the valve body and close to the two ends of the valve body, respectively, two internal exhaust passages are arranged on the two ends of the gas internal exhaust valve rod and correspond to the positions of the two external exhaust holes, respectively, and the two internal exhaust passages are arranged in communication with the two external exhaust holes, respectively;

[0014] The gas internal exhaust valve rod is used to exhaust the internal gas from the external exhaust hole at the front end of the valve body through the internal exhaust passage at the front end of the gas internal exhaust valve rod when the forward reversing is performed in the movable cavity;

[0015] The gas internal exhaust valve rod is used to exhaust the internal gas from the external exhaust hole at the rear end of the valve body through the internal exhaust passage at the rear end of the gas internal exhaust valve rod when the reverse reversing is performed in the movable cavity.

[0016] As an improved scheme, the type of the external exhaust hole includes a threaded hole.

[0017] As an improved scheme, the internal exhaust passage includes an L-shaped passage;

[0018] The horizontal part of the L-shaped passage is arranged along the central axis of the gas internal exhaust valve rod, and the vertical part of the L-shaped passage is arranged corresponding to the external exhaust hole.

[0019] As an improved scheme, the valve body includes a horizontally arranged valve shell and a front cover and a rear cover respectively mounted on the front and rear ends of the valve shell.

[0020] The movable cavity is sequentially arranged through the front cover, the valve shell and the rear cover.

[0021] As an improved scheme, the front and rear ends of the gas internal exhaust valve rod are located in the front cover and the rear cover respectively, and the front and rear ends of the gas internal exhaust valve rod are sleeved with pistons respectively, and the two pistons are in slidable contact with the inner walls of the movable cavities in the front cover and the rear cover.

[0022] As an improved scheme, the movable cavities in the valve shell are provided with first sealing rings around the gas internal exhaust valve rod at two ends respectively; the two first sealing rings are arranged correspondingly to the internal exhaust passages at the front and rear ends of the gas internal exhaust valve rod.

[0023] The two first sealing rings are used for sealing the movable cavities between the front cover and the rear cover.

[0024] As an improved scheme, the movable cavities between the two first sealing rings are uniformly provided with a plurality of second sealing rings closely around the gas internal exhaust valve rod; the plurality of second sealing rings are connected with the inner walls of the movable cavities through fixed ring sleeves.

[0025] As an improved scheme, the valve shell, the front cover and the rear cover adopt a split type design.

[0026] Or,

[0027] The valve shell, the front cover and the rear cover adopt an integrated design.

[0028] The beneficial effects of the utility model are as follows:

[0029] The internal exhaust breathing type electromagnetic valve for preventing external impurities of the utility model cancels the traditional exposed breathing hole design, adopts a valve rod integrated exhaust system, effectively blocks the rainwater infiltration path, significantly improves the sealing protection level under outdoor working conditions, and is particularly suitable for harsh environments with much rain, humidity and dust diffusion; in addition, the utility model maintains the original appearance size, and combines the exhaust passage and the valve rod movement mechanism, which not only ensures the smoothness of the gas path of the reversing action, but also avoids the blockage failure caused by the invasion of external pollutants; the valve rod channel design based on independent sealing makes the dynamic sealing piece bear force more evenly, reduces the operation torque, prolongs the service life of the sealing piece, realizes the double breakthrough of equipment reliability and environmental adaptability, makes up for the defects of the prior art, and has high application value. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a cross-sectional structure schematic view of the internal exhaust breathing type electromagnetic valve for preventing external impurities in the utility model embodiment;

[0031] Figure 2 is a perspective structure schematic view of the internal exhaust breathing type electromagnetic valve of the utility model in an embodiment of the utility model, when the front cover is removed;

[0032] Figure 3 is a perspective structure schematic view of the internal exhaust breathing type electromagnetic valve of the utility model in an embodiment of the utility model, when the front cover is removed, under the section view angle;

[0033] Figure 4 is a section structure schematic view of the internal exhaust breathing type electromagnetic valve of the utility model in an embodiment of the utility model, when the front cover is removed;

[0034] The marks of components in the drawings are as follows:

[0035] 1, valve shell;2, front cover;3, rear cover;4, gas internal exhaust valve rod;5, external exhaust hole;6, internal exhaust passage;7, movable cavity;8, piston;9, first sealing ring;10, second sealing ring;11, fixed grid sleeve. DETAILED DESCRIPTION

[0036] The preferred embodiments of the utility model are described in detail below in combination with the drawings, so that the advantages and features of the utility model can be more easily understood by the person skilled in the art, and the protection scope of the utility model can be more clearly and explicitly defined.

[0037] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0038] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0039] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0040] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0041] Need to explain, when element is called " fixed in " or " set in " another element, it can be directly on another element or also can exist intermediate element.When an element is considered " connected " another element, it can be directly connected to another element or possibly exist intermediate element.The terms " vertical " " horizontal " " up " " down " " left " " right " and similar expressions used herein are only for the purpose of illustration, and not represent the only embodiment.

[0042] Please refer to Figures 1-4 , the utility model embodiment includes:

[0043] A kind of internal exhaust breathing type solenoid valve of preventing external impurities, it include: valve body and gas internal exhaust valve stem 4;

[0044] Wherein, as Figure 1 Shown, valve body inside is equipped with movable cavity 7 along the length direction of valve body, and the position of movable cavity 7 is opened with external exhaust hole 5 on the outer surface of valve body;

[0045] Wherein, as Figure 1As shown, the gas internal exhaust valve rod 4 is movably arranged in the movable cavity 7, and the gas internal exhaust valve rod 4 is arranged along the movable cavity 7, and the end of the gas internal exhaust valve rod 4 is provided with an internal exhaust passage 6 corresponding to the position of the external exhaust hole 5; in this embodiment, the gas internal exhaust valve rod 4 is used to exhaust the internal gas from the external exhaust hole 5 outside the valve body through the internal exhaust passage 6 when the reversing action is performed in the movable cavity 7, and further, the exhaust passage and the valve rod movement mechanism are ingeniously combined without changing the original size of the electromagnetic valve, which ensures the smoothness of the gas path during the reversing action and avoids the problem of blockage caused by the invasion of external pollutants into the valve body.

[0046] In a preferred embodiment, as shown in Figures 1-4 As shown, the external exhaust hole 5 is at least two, the internal exhaust passage 6 is at least two, and the internal exhaust passage 6 is arranged one by one corresponding to the external exhaust hole 5; as shown in Figure 1 The actual external exhaust hole 5 is at least three; two external exhaust holes 5 are respectively arranged on the lower surface of the valve body and close to the positions of the front and rear ends of the valve body, two internal exhaust passages 6 are symmetrically arranged on the two ends of the gas internal exhaust valve rod 4 and respectively correspond to the positions of the two external exhaust holes 5, and the two internal exhaust passages 6 are respectively arranged in communication with the two external exhaust holes 5; wherein the external exhaust hole 5 is a threaded hole, and further, the electromagnetic valve can be used in harsh environments, and a special threaded joint can be used to guide the exhaust to the appropriate area; in addition, the internal exhaust passage 6 is an L-shaped passage, the horizontal part of the L-shaped passage is arranged along the central axis of the gas internal exhaust valve rod 4, and the vertical part is arranged corresponding to and towards the external exhaust hole 5, and the exhaust hole is combined with the valve rod through this design, and since the external exhaust hole 5 is in communication with the internal exhaust passage 6 of the valve rod, the internal gas can be quickly exhausted during the reversing process of the valve rod; finally, when the gas internal exhaust valve rod 4 is displaced to the right in the movable cavity 7 for forward reversing, the internal gas is exhausted from the external exhaust hole 5 at the left end of the valve body through the internal exhaust passage 6 at the left end of the gas internal exhaust valve rod 4; when the gas internal exhaust valve rod 4 is displaced to the left in the movable cavity 7 for reverse reversing, the internal gas is exhausted from the external exhaust hole 5 at the right end of the valve body through the internal exhaust passage 6 at the right end of the gas internal exhaust valve rod 4.

[0047] In a preferred embodiment, as shown in Figure 1As shown, the valve body comprises: horizontally arranged valve shell 1 and front cover 2 and rear cover 3 mounted on the front and rear ends of valve shell 1 respectively; in this embodiment, valve shell 1, front cover 2 and rear cover 3 are designed in a split type; it is conceivable that valve shell 1, front cover 2 and rear cover 3 are designed in an integrated type; wherein the aforementioned movable cavity 7 is arranged in sequence through front cover 2, valve shell 1 and rear cover 3; the front and rear ends of the gas internal exhaust valve rod 4 are located in front cover 2 and rear cover 3 respectively, and the front and rear ends of the gas internal exhaust valve rod 4 are sleeved with pistons 8 respectively, and the two pistons 8 are in slidable contact with the inner walls of the movable cavities 7 in front cover 2 and rear cover 3 respectively, and the piston 8 is used to push the reversing action of the gas internal exhaust valve rod 4; in order to further ensure the sealing property of the electromagnetic valve and prevent dust and impurities from entering, corresponding sealing rings are arranged at the positions of the original exhaust holes of the electromagnetic valve, specifically: first sealing rings 9 are arranged around the gas internal exhaust valve at both ends of the movable cavity 7 in the valve shell 1, and the two first sealing rings 9 are arranged corresponding to the internal exhaust passages 6 at the front and rear ends of the gas internal exhaust valve rod 4 respectively; the two first sealing rings 9 are used to seal the movable cavity 7 between front cover 2 and rear cover 3; in addition, the movable cavity 7 between the two first sealing rings 9 is uniformly provided with a plurality of second sealing rings 10 closely connected with each other around the gas internal exhaust valve rod 4; the plurality of second sealing rings 10 are connected with the inner walls of the movable cavities 7 through fixed lattice sleeves 11, thereby further improving the sealing property, and the plurality of second sealing rings 10 are respectively provided with avoiding holes avoiding the external exhaust holes 5, thereby ensuring that the exhaust action is not affected.

[0048] In summary, when the piston 8 pushes out to make the gas internal exhaust valve rod 4 reverse forward, the gas discharged by the piston 8 flows to the external exhaust hole 5 at the left end of the valve body through the internal exhaust passage 6 at the left end of the gas internal exhaust valve rod 4, thereby ensuring the smooth action of the piston 8; when the piston 8 resets to make the gas internal exhaust valve rod 4 reverse, the inhaled gas flows to the external exhaust hole 5 at the right end of the valve body through the internal exhaust passage 6 at the right end of the gas internal exhaust valve rod 4, thereby also ensuring the smooth action of the piston 8; in this process, based on the above structure design, the dust and impurities in the external environment are prevented from entering the valve body through the exhaust hole during the reversing process, thereby ensuring the sealing property and the applicability of the valve body.

[0049] The above is only an embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure made by using the utility model specification and drawing contents, or directly or indirectly used in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. An internally venting, breathing-type solenoid valve for preventing external impurities, characterized in that, include: Valve body and gas venting valve stem (4); The valve body has a movable cavity (7) inside along the length of the valve body, and an external exhaust hole (5) is opened on the outer surface of the valve body corresponding to the movable cavity (7); The gas internal exhaust valve stem (4) is movably disposed in the movable cavity (7), and the gas internal exhaust valve stem (4) is disposed along the movable cavity (7). The end of the gas internal exhaust valve stem (4) is provided with an internal exhaust channel (6) corresponding to the position of the external exhaust hole (5). The gas internal exhaust valve stem (4) is used to discharge the internal gas from the external exhaust hole (5) to the valve body through the internal exhaust channel (6) when the valve moves in the movable cavity (7).

2. The internally venting solenoid valve for preventing external impurities according to claim 1, characterized in that: The external exhaust port (5) is located on the lower surface of the valve body and near the end of the valve body. The internal exhaust channel (6) is located at the end of the gas internal exhaust valve stem (4) and corresponds to the position of the external exhaust port (5). The internal exhaust channel (6) is connected to the external exhaust port (5).

3. The internally venting solenoid valve for preventing external impurities according to claim 2, characterized in that: There are at least two external exhaust holes (5) and at least two internal exhaust channels (6), and the internal exhaust channels (6) are provided in a one-to-one correspondence with the external exhaust holes (5); The two external exhaust holes (5) are respectively opened on the lower surface of the valve body and close to both ends of the valve body. The two internal exhaust channels (6) are symmetrically opened at both ends of the gas internal exhaust valve stem (4) and respectively correspond to the positions of the two external exhaust holes (5). The two internal exhaust channels (6) are respectively connected to the two external exhaust holes (5). The gas exhaust valve stem (4) is used to discharge the internal gas through the external exhaust hole (5) at the front end of the valve body through the internal exhaust channel (6) at the front end of the gas exhaust valve stem (4) when the active chamber (7) is reversed in the forward direction; The gas exhaust valve stem (4) is used to discharge the internal gas through the internal exhaust channel (6) at the rear end of the gas exhaust valve stem (4) from the external exhaust port (5) at the rear end of the valve body when the gas is reversed in the active chamber (7).

4. The internally venting solenoid valve for preventing external impurities according to claim 1, characterized in that: The types of external vent holes (5) include: threaded holes.

5. The internally venting solenoid valve for preventing external impurities according to claim 1, characterized in that: The internal exhaust channel (6) includes: an L-shaped channel; The horizontal portion of the L-shaped channel is arranged along the central axis of the gas internal exhaust valve stem (4), and the vertical portion of the L-shaped channel is arranged corresponding to the external exhaust port (5).

6. The internally venting solenoid valve for preventing external impurities according to claim 3, characterized in that: The valve body includes: a horizontally arranged valve shell (1) and a front cover (2) and a rear cover (3) respectively installed at the front and rear ends of the valve shell (1); The movable cavity (7) is arranged to pass through the front cover (2), the valve shell (1) and the rear cover (3) in sequence.

7. The internally venting solenoid valve for preventing external impurities according to claim 6, characterized in that: The front and rear ends of the gas venting valve stem (4) are located in the front cover (2) and the rear cover (3) respectively. The front and rear ends of the gas venting valve stem (4) are respectively fitted with pistons (8). The two pistons (8) are slidably in contact with the inner walls of the movable chambers (7) in the front cover (2) and the rear cover (3) respectively.

8. The internally venting solenoid valve for preventing external impurities according to claim 6, characterized in that: The movable cavity (7) inside the valve housing (1) is provided with first sealing rings (9) around the gas exhaust valve stem (4) at both ends; the two first sealing rings (9) are respectively provided with the internal exhaust channels (6) at the front and rear ends of the gas exhaust valve stem (4); The two first sealing rings (9) are used to seal the movable cavity (7) between the front cover (2) and the rear cover (3), respectively.

9. The internally venting solenoid valve for preventing external impurities according to claim 8, characterized in that: In the movable cavity (7) between the two first sealing rings (9), a plurality of second sealing rings (10) are evenly arranged around the gas vent valve stem (4) and closely abut each other; the plurality of second sealing rings (10) are connected to the inner wall of the movable cavity (7) through a fixed sleeve (11); the plurality of second sealing rings (10) are respectively provided with avoidance holes to avoid the external exhaust hole (5).

10. The internally venting solenoid valve for preventing external impurities according to claim 6, characterized in that: The valve housing (1), the front cover (2), and the rear cover (3) are designed as separate units. or, The valve housing (1), the front cover (2), and the rear cover (3) are designed as a single unit.

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