Electric push rod breathable protection structure

Abstract

The utility model provides a kind of electric push rod ventilation protection structure, the electric push rod includes organic shell and is located on the ventilation valve of the shell, the ventilation protection structure includes cover body, the cover body is installed on the shell, the cavity that can be wrapped inside ventilation valve is formed in the cover body, the cover body has the vent hole that is in fluid communication with the cavity, the vent hole direction is downward, by forming cavity in cover body and surrounding ventilation valve inside, ventilation valve is formed protection, avoid water and dust directly cover on the surface of ventilation valve and make ventilation valve block failure;And ventilation hole is set on cover body to balance the air pressure inside and outside cavity, so that the ventilation valve in cavity can work normally, the vent hole is designed as direction downward, water and dust are not easy to enter cavity from vent hole and adhere to the surface of ventilation valve, provide a stable working environment for ventilation valve.

Description

Technical Field

[0001] This utility model relates to the field of electric linear actuator technology, and in particular to a breathable protective structure for electric linear actuators. Background Technology

[0002] An electric linear actuator is a mechanical device that converts the rotary motion of a motor into linear push-pull motion. It is widely used in industrial automation, medical equipment, home appliances, and automobiles. Common electric linear actuators include... Figure 1 As shown, the device includes a housing 1', a drive mechanism housed within the housing 1', a transmission mechanism connected to the drive mechanism and capable of converting the rotational force provided by the drive mechanism into linear motion, and a push rod body 2' connected to the transmission mechanism and capable of extending and retracting relative to the housing 1'. During operation, the internal air pressure difference is generated due to temperature changes or piston movement. Therefore, the housing 1' of the electric push rod is typically equipped with a vent valve 3'. This vent valve 3' prevents negative or positive pressure from forming in the sealed cavity, thereby avoiding affecting the smoothness of the electric push rod's movement.

[0003] In practical use, the aforementioned electric actuators are often installed in desolate outdoor locations such as the Gobi Desert or other remote areas. In rainy, snowy, or dusty weather, the vent valve 3' often becomes clogged with rain and dust, preventing the balance of pressure between the inside and outside of the actuator and reducing its efficiency and speed. Especially in rainy or snowy weather, if the vent valve 3' malfunctions, negative pressure can build up inside the actuator, drawing rainwater in and causing damage. Existing technology typically uses a waterproof and breathable membrane on the vent valve 3' to prevent this, but after prolonged use, the membrane is prone to damage or blockage, allowing dust and water to enter. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an electric push rod ventilation protection structure that can effectively protect the vent valve from water and sand entering the vent valve, in light of the above-mentioned technical status.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the electric push rod ventilated protection structure includes a housing and a ventilated valve provided on the housing, characterized in that: a cover is installed on the housing, a cavity is formed in the cover that can enclose the ventilated valve, and the cover has a vent hole that is in fluid communication with the cavity, and the vent hole faces downward.

[0006] Preferably, the angle α between the central axis of the vent and the vertical direction is an acute angle or 0°. This ensures the vent faces downwards, preventing water and dust from easily entering the cavity. Simultaneously, at this angle, dust accumulated on the surface of the vent is easily dislodged by vibration or wind, preventing it from accumulating at the edges of the vent.

[0007] To ensure that the vent faces downwards after the cover is installed, preferably, the cover has a connecting surface that connects to the housing, and the shape of the connecting surface matches the outer surface of the housing, thereby creating a positioning between the cover and the housing. This structure allows for positioning of the cover's installation direction, ensuring that the vent always faces downwards when the electric actuator is operating.

[0008] As a structure of the cover, the cover includes a bottom wall, a side wall extending upward from the outer edge of the bottom wall, and a top wall covering the top of the side wall and detachably connected to the side wall. The top wall, side wall and bottom wall surround to form the cavity. The bottom wall includes the connecting surface. The vent hole is provided on the side wall. The vent valve includes a vent valve body and a connecting post for connecting the vent valve body to the housing. The bottom wall has a perforation. The connecting post passes through the perforation to limit the bottom wall between the vent valve body and the housing. The structure forms a cavity between the top, side, and bottom walls, enclosing the vent valve and protecting it from water and dust. This provides a stable working environment for the vent valve. Ventilation holes on the side walls balance the air pressure inside and outside the cavity, ensuring the vent valve functions properly. Because the connection structure between the bottom wall and the casing matches the outer surface of the casing, it prevents the vent from being mistakenly installed. This ensures that the vent faces downwards in any working state after installation, preventing water and dust from entering the cavity through the vent and covering the vent valve surface. Even if some water and dust enter the cavity due to splashing or capillary action during use, they can flow out through the downward-facing vent, effectively protecting the vent valve.

[0009] To prevent the vents from becoming clogged, preferably, the diameter of the vents gradually increases from the inside out. That is, the vents have a structure with a large opening and a small interior. The larger opening on the outside reduces the airflow velocity, causing sand and dust to settle at the inlet due to inertia, and preventing them from entering the interior of the vents with the airflow as the diameter decreases, thus effectively preventing sand and dust from clogging the vents.

[0010] Preferably, a first sealing ring is provided between the bottom wall and the housing, and a second sealing ring is provided between the bottom wall and the vent valve body. Both the first and second sealing rings are fitted onto the connecting post. The first sealing ring prevents water and dust from entering the housing or cavity from between the bottom wall and the housing, while the second sealing ring provides a double seal, ensuring that even if water seeps in from the first sealing ring, it will not seep into the cavity.

[0011] To allow for the detachable connection of the top wall to the side wall, preferably, the top wall portion extends downward to form a connecting part. This connecting part extends into the cavity and is detachably connected to the side wall via a connector. Thus, the top wall can be installed on or removed from the side wall by installing and removing the connector, which can be screws or the like. The connecting part provides a connection space between the two, and its extension into the cavity prevents water and dust from entering the cavity through the gap between the top and side walls. This further prevents water and dust from entering the vent valve and covering its surface, ensuring a stable operating environment for the vent valve.

[0012] As another structure of the cover, the cover includes an upper cover and a lower cover detachably connected to the upper cover. The upper and lower covers fit together to form the cavity. The ends of the upper and lower covers, when fitted together, form mounting holes for the housing to pass through. The wall of the mounting hole forms the connecting surface. The vent is located on the lower cover. By fitting the upper and lower covers together, a portion of the housing and the vent valve located on that portion of the housing are enclosed, forming a cavity that protects the vent valve. The wall of the mounting hole between the upper and lower covers forms a connecting surface that fits the outer surface of the housing, ensuring that the upper cover is on top and the lower cover is on the bottom during installation. This ensures that the vent on the lower cover faces downwards. The vent balances the air pressure inside and outside the cavity, and its downward orientation prevents water and dust from entering. Even if some water and dust enter the cavity due to splashing or capillary action during use, they can flow out through the downward-facing vent, effectively protecting the vent valve.

[0013] Preferably, the bottom of the lower cover is an inverted cone with a gradually decreasing cross-sectional area, and the vent is located at the bottom of the inverted cone. In this way, even if some water and sand enter the cavity, they can accumulate at the bottom of the inverted cone-shaped lower cover under the action of gravity and flow out through the vent, preventing water and sand from covering the surface of the vent valve and providing a stable working environment for the vent valve.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] 1. The electric push rod ventilation and protection structure protects the ventilation valve by installing a cover on the housing, forming a cavity inside the cover and enclosing the ventilation valve inside, thereby preventing water and sand from directly covering the surface of the ventilation valve and causing it to become blocked and malfunction.

[0016] 2. Ventilation holes are provided on the cover to balance the air pressure inside and outside the cavity, so that the vent valve inside the cavity can work normally. The vent hole is designed to face downwards, so that water and sand cannot easily enter the cavity through the vent hole and adhere to the surface of the vent valve, thus providing a stable working environment for the vent valve. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the electric actuator in the background art of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the cover in Embodiment 1 of this utility model;

[0019] Figure 3 for Figure 2 Sectional view at point DD;

[0020] Figure 4 for Figure 2 Sectional view at EE;

[0021] Figure 5 This is an exploded view of the cover in Embodiment 1 of this utility model;

[0022] Figure 6 This is a schematic diagram of the limit state of the electric push rod in Embodiment 1 of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the cover in Embodiment 2 of this utility model. Figure 1 ;

[0024] Figure 8 for Figure 7 Sectional view at FF;

[0025] Figure 9 This is a schematic diagram of the structure of the cover in Embodiment 2 of this utility model. Figure 2 ;

[0026] Figure 10 This is an exploded view of the cover in Embodiment 2 of this utility model;

[0027] Figure 11 This is a schematic diagram of the limit state of the electric push rod in Embodiment 2 of this utility model. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] like Figures 2-6 As shown, the electric actuator ventilated protective structure of this embodiment is applied to applications such as... Figure 2The electric actuator shown includes a housing 6, within which is a drive mechanism (not shown), a transmission mechanism (not shown) connected to the drive mechanism and capable of converting the rotational force provided by the drive mechanism into linear motion, and an actuator body 61 connected to the transmission mechanism and capable of extending and retracting relative to the housing 6. The housing 6 is equipped with a vent valve 7 for balancing the air pressure inside and outside the housing 6. The vent valve 7 includes a vent valve body 71 and a connecting post 72. The vent valve body 71 is connected to the housing 6 via the connecting post 72, and the connection gap between the vent valve 7 and the housing 6 is sealed by a sealant. In this embodiment, the connecting post 72 is a threaded post and is threadedly connected to the housing 6. In this embodiment, a cover 1 is installed on the housing 6, which encloses the vent valve 7, thereby protecting the vent valve 7 from direct contact with water and dust, and ensuring the normal operation of the vent valve 7 and the electric actuator.

[0031] As a structure of the cover 1, see Figures 3-5 In this embodiment, the cover 1 includes a bottom wall 101 connected to the housing 6, a side wall 102 extending upward from the outer edge of the bottom wall 101, and a top wall 103 covering the top of the side wall 102 and detachably connected to the side wall 102. The top wall 103, side wall 102, and bottom wall 101 enclose the vent valve 7 and form a cavity 2. The cover 1 can protect the vent valve 7, and the cavity 2 provides a stable working environment for the vent valve 7, preventing water and dust from directly covering the surface of the vent valve 7 and causing it to malfunction. The side wall 102 has vent holes 3 that are fluidly connected to the cavity 2 to balance the atmospheric pressure inside and outside the cavity 2 and ensure that the vent valve 7 can work normally. (See reference...) Figure 4 The vent 3 is designed as an irregularly shaped, elongated hole, such as... Figure 4 The ventilation hole 3 shown in the example has a bent and protruding wall. This structure disrupts the airflow direction, causing water and dust to collide with the hole wall due to inertia and settle, rather than directly entering the cavity 2. Furthermore, the diameter of the ventilation hole 3 gradually increases from the inside out. That is, the ventilation hole 3 adopts a structure with a large external opening and a small internal opening. The larger external opening reduces the airflow velocity, causing dust to settle at the inlet due to inertia, preventing it from entering the smaller diameter ventilation hole 3 with the airflow, effectively avoiding dust blockage. Specifically, the diameter of the ventilation hole 3 is between 1 and 3 mm. To prevent water and dust from entering the cavity 2 through the ventilation hole 3, the ventilation hole 3 is designed to face downwards in any operating state of the electric actuator, and the angle α between the central axis C and the vertical direction is an acute angle or 0°. In other words, the angle α between the central axis C of the ventilation hole 3 and the vertical direction satisfies -90° < α < 90° in any operating state of the electric actuator. See details... Figure 6(The solid line represents the initial working state of the electric actuator, and the dashed line represents the extreme working state of the electric actuator.) In any state between the initial and extreme working states, the vent 3 faces downwards to prevent water and dust from entering the cavity 2. Combined with the irregular shape of the vent 3 and its gradually increasing diameter from the inside out, this further prevents water and dust from entering. This ensures that no water or dust will enter through the vent 3 and cover the surface of the vent valve 7, allowing the vent valve 7 to operate in a stable environment without malfunctioning due to blockage by water and dust, thus providing effective protection for the vent valve 7. Even if the electric actuator operates in a humid environment, and a small amount of water or dust enters the cavity 2 through splashing or capillary action from the vent 3 or various connection gaps, this water and dust can flow out through the downward-facing vent 3 without accumulating on the vent valve 7 and causing blockage.

[0032] The following describes the installation method of the cover 1. In this embodiment, the bottom wall 101 of the cover 1 has a through hole 1011. The connecting post 72 of the vent valve 7 passes through the through hole 1011 and is threaded onto the housing 6, thereby limiting the bottom wall 101 between the vent valve body 71 and the housing 6. To ensure that the vent hole 3 faces downward when the cover 1 is installed on the housing, this embodiment has a foolproof design on the cover 1. Specifically, the bottom wall 101 of the cover 1 has a connecting surface 4 that connects to the housing 6. The structure of the connecting surface 4 matches the outer surface of the housing 6. Specifically, the connecting surface 4 is an upward concave surface from the bottom of the bottom wall 101. The upward concave surface is adapted to the outer surface of the housing 6, so that the cover 1 and the housing 6 are positioned, thereby positioning the installation direction of the cover 1, so that the cover 1 can only be installed in the preset direction (i.e., the vent hole 3 faces downward). In addition, a first sealing ring 51 is provided between the bottom wall 101 and the housing 6, and a second sealing ring 52 is provided between the bottom wall 101 and the vent valve body 71. The first sealing ring 51 is sleeved on the connecting post 72 and seals the connection gap between the bottom wall 101 and the housing 6. The second sealing ring 52 is sleeved on the connecting post 72 and seals the connection gap between the bottom wall 101 and the vent valve body 71. The first sealing ring 51 can prevent water and sand from entering the housing 6 or the cavity B from between the bottom wall 101 and the housing 6. The second sealing ring 52 provides a double seal, so even if water seeps in from the first sealing ring 51, it will not seep into the cavity B.

[0033] As one way the top wall 103 can be detachably connected to the side wall 102, see Figure 5The top wall 103 extends downward to form a connecting portion 1031. The connecting portion 1031 extends into the cavity 2 and is detachably connected to the side wall 102 via a connector 104. In this embodiment, the connector 104 is a screw. The connection portion 1031 provides a connection space for the screw connection between the top wall 103 and the side wall 102. At the same time, the connection portion 1031 extending into the cavity 2 can prevent water and sand from entering the cavity 2 from the connection gap between the top wall 103 and the side wall 102, and further prevent water and sand from entering the vent valve 7 and covering its surface.

[0034] When installing the cover 1, first use the threaded post of the vent valve 7 to pass through the second sealing ring 52, the through hole of the bottom wall 101 and the first sealing ring 51 respectively, and then thread it onto the housing 6. Then connect the top wall 103 to the side wall 102 with screws to complete the installation.

[0035] Example 2

[0036] See Figure 7-11 This embodiment provides another structure for the cover 1.

[0037] In this embodiment, the cover 1 includes an upper cover 111 and a lower cover 112 detachably connected to the upper cover 111. The upper cover 111 and the lower cover 112 fit together to form a cavity 2. The vent valve 7 is enclosed in the cavity 2 by the upper cover 111 and the lower cover 112 to protect the vent valve 7. The lower cover 112 is provided with a vent 3 that is in fluid communication with the cavity 2. This vent 3 always faces downwards in any operating state of the electric actuator, and the angle α between the central axis C and the vertical direction is an acute angle or 0°. That is, the angle α between the central axis C of the vent 3 and the vertical direction always satisfies -90° < α < 90° in any operating state of the electric actuator. This vent 3 serves to balance the air pressure inside and outside the cavity 2. Simultaneously, the vent 3 always faces downwards to prevent water and dust from entering the cavity 2 through the vent 3 and covering the vent valve 7. See details below. Figure 11 (The solid line represents the initial working state of the electric actuator, and the dashed line represents the extreme working state of the electric actuator.) In any state between the initial working state and the extreme working state, the direction of the vent 3 is downward, which prevents water and sand from entering the cavity 2 through the vent 3, thereby effectively protecting the vent valve 7.

[0038] For details, please refer to Figure 9When the upper cover 111 and the lower cover 112 are in the mating state, they form mounting holes 113 through which the housing 6 passes. The hole wall of the mounting hole 113 forms a connecting surface 4 that fits the housing 6. The structure of the connecting surface 4 matches the outer surface of the housing 6, thereby creating a positioning between the cover 1 and the housing 6. This positioning structure has a foolproof function, ensuring that the cover 1 can only be installed in a preset direction (i.e., the direction of the vent 3 is downward). Because the electric actuator rotates during operation, water or dust adhering to the housing 6 will flow downwards along the housing 6 and enter the cavity 2 through the gap between the upper cover 111, the lower cover 112 and the housing 6. To avoid this, in this embodiment, the wall of the mounting hole 113 at the higher position is sealed to the housing 6 by means of glue injection, silicone gasket, etc., to prevent water and dust from flowing into the cavity 2. The mounting hole 113 at the lower position is located below, and the water and dust above it are blocked by the sealing structure between the wall of the mounting hole 113 at the higher position and the housing 6. The water and dust below it will not flow upwards, so sealing is not required. Of course, sealing can also be performed between the wall of the mounting hole 113 at the lower position and the housing 6 to prevent water and dust from entering the cavity 2.

[0039] In this embodiment, the lower cover 112 is specially designed as an inverted cone with a gradually decreasing cross-sectional area at the bottom. The vent 3 is located at the bottom of the inverted cone. This design increases the volume of the cavity 2 inside the cover 1, allowing water and dust to enter the cavity 2 by splashing or capillary action. They will also accumulate in the inverted cone structure at the bottom of the lower cover 112 and flow out from the vent 3, preventing water and dust from covering the surface of the vent valve 7, thus providing effective protection for the vent valve 7.

[0040] As one way to detachably connect the upper cover 111 and the lower cover 112, see Figure 10 In this embodiment, the upper cover 111 has four mounting portions 114 and the lower cover 112 has four connecting holes 115. The upper cover 111 and the lower cover 112 are connected by four mounting parts 116 passing through the corresponding connecting holes 115 and connecting with the mounting portions 114 respectively. The mounting parts 116 are connecting screws, which can be detached and connected together by threaded connection with the mounting portions 114.

[0041] When the cover 1 is installed, the upper cover 111 is placed on the housing 6 and the lower cover 112 is placed below the housing 6. The upper cover 111 and the lower cover 112 are joined together to form a cavity 2 and enclose the vent valve 7. The upper cover 111 and the lower cover 112 are connected by threaded screws through the corresponding connecting holes 115 and the mounting part 114.

[0042] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "inner," "outer," "upper," and "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A breathable protective structure for an electric actuator, comprising a housing (6) and a breathable valve (7) disposed on the housing (6), characterized in that: A cover (1) is installed on the housing (6). A cavity (2) is formed inside the cover (1) to enclose the vent valve (7). The cover (1) has a vent (3) that is in fluid communication with the cavity (2) and the vent (3) faces downward.

2. The breathable and protective structure for the electric actuator according to claim 1, characterized in that: The angle α between the central axis (C) of the vent (3) and the vertical direction is an acute angle or 0°.

3. The ventilated protective structure for the electric actuator according to claim 1 or 2, characterized in that: The cover (1) has a connecting surface (4) that connects to the housing (6). The shape of the connecting surface (4) matches the outer surface of the housing (6), thereby creating a positioning between the cover (1) and the housing (6).

4. The breathable and protective structure for the electric actuator according to claim 3, characterized in that: The cover (1) includes a bottom wall (101), a side wall (102) extending upward from the outer edge of the bottom wall (101), and a top wall (103) covering the top of the side wall (102) and detachably connected to the side wall (102). The top wall (103), side wall (102) and bottom wall (101) surround and form the cavity (2). The bottom wall (101) includes the connecting surface (4). The vent hole (3) is provided on the side wall (102). The vent valve (7) includes a vent valve body (71) and a connecting post (72) for connecting the vent valve body (71) to the housing (6). The bottom wall (101) has a through hole (1011). The connecting post (72) passes through the through hole (1011) to limit the bottom wall (101) between the vent valve body (71) and the housing (6).

5. The breathable and protective structure for the electric actuator according to claim 4, characterized in that: The diameter of the vent (3) gradually increases from the inside to the outside.

6. The ventilated protective structure for the electric actuator according to claim 4 or 5, characterized in that: A first sealing ring (51) is provided between the bottom wall (101) and the housing (6), and a second sealing ring (52) is provided between the bottom wall (101) and the vent valve body (71). Both the first sealing ring (51) and the second sealing ring (52) are sleeved on the connecting column (72).

7. The ventilated and protective structure for the electric actuator according to claim 4 or 5, characterized in that: The top wall (103) extends downward to form a connecting part (1031), which extends into the cavity (2) and is detachably connected to the side wall (102) via a connector (104).

8. The breathable and protective structure for the electric actuator according to claim 3, characterized in that: The cover (1) includes an upper cover (111) and a lower cover (112) that can be detachably connected to the upper cover (111). The upper cover (111) and the lower cover (112) are fitted together to form the cavity (2). The ends of the upper cover (111) and the lower cover (112) form mounting holes (113) for the housing (6) to pass through when they are fitted together. The wall of the mounting hole (113) forms the connecting surface (4). The vent hole (3) is provided on the lower cover (112).

9. The breathable and protective structure for the electric actuator according to claim 8, characterized in that: The bottom of the lower cover (112) is an inverted cone with a gradually decreasing cross-sectional area, and the vent (3) is located at the bottom of the inverted cone.

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