Sealing structure of an electric pneumatic telescopic rod

Abstract

In view of the technical problem that the traditional electric pneumatic telescopic rod has poor sealing performance and cannot meet the airtightness requirements of the electric pneumatic telescopic rod in the market, the present invention provides a sealing structure for an electric pneumatic telescopic rod. The sealing structure of the electric pneumatic telescopic rod includes: a housing, a driving mechanism, and a sealing mechanism. During the working process of the above-mentioned sealing structure of the electric pneumatic telescopic rod, an external circuit is electrically connected to the motor assembly through a power connection terminal. The motor assembly drives the driving screw to rotate. By using the lead screw to move away, the driving screw rotates to drive the telescopic rod to move up and down along the limiting cylinder. The bearing ring increases the structural strength of the housing, thereby increasing the structural stability of the sealing structure of the electric pneumatic telescopic rod. Two sealing rings are arranged between the housing and the driving cylinder, forming two airtight protection layers, greatly increasing the airtightness of the sealing structure of the electric pneumatic telescopic rod and meeting the airtightness requirements of the electric pneumatic telescopic rod in the market.

Description

Technical Field

[0001] The present invention relates to the field of electric telescopic rods, and particularly to a sealing structure of an electric pneumatic telescopic rod. Background Art

[0002] An electric telescopic rod, also called an electric push rod, is a power-driven device that converts the rotational motion of a motor into the linear reciprocating motion of a push rod. The electric push rod is mainly composed of mechanisms such as a motor, a push rod, and a control device, and is a new type of linear actuator that can achieve remote control and centralized control. The electric push rod makes a reciprocating motion within a certain range of travel, converting the rotational motion of the motor into a linear reciprocating motion. It drives a set of link mechanisms to complete the switching work of dampers, valves, gates, baffles, etc. Using an electric push rod as the actuator can not only reduce the air source device and auxiliary equipment required for using a pneumatic actuator, but also reduce the weight of the actuator. When using an electric push rod actuator, power supply is required when changing the control opening, and power supply can be stopped when the required opening is reached. Therefore, from the perspective of energy conservation, the electric push rod actuator has obvious energy-saving advantages compared with the pneumatic actuator.

[0003] However, an electric telescopic rod is a structural component necessary to achieve electric opening and closing or telescopic actions. During the electric opening and closing or telescopic process, the electric telescopic rod can provide the supporting force or the pushing and pulling force for the opening and closing or telescopic load member. Currently, the supporting force of the opening and closing or telescopic load member is mainly achieved in the following two ways, namely, the way of an electric spring telescopic rod (with an internal or external spring) and the way of an electric pneumatic telescopic rod (filled with high-pressure gas inside). For a traditional electric pneumatic telescopic rod, such as the technical solution disclosed in the patent with the application number: CN200710028677.6 and the patent name of an air pressure telescopic rod, the sealing performance is poor and cannot meet the airtightness requirements of electric pneumatic telescopic rods in the market. Summary of the Invention

[0004] Based on this, in view of the technical problem that the sealing performance of the traditional electric pneumatic telescopic rod is poor and cannot meet the airtightness requirements of electric pneumatic telescopic rods in the market, it is necessary to provide a sealing structure of an electric pneumatic telescopic rod.

[0005] A sealing structure of an electric pneumatic telescopic rod, the sealing structure of the electric pneumatic telescopic rod includes: a housing, a driving mechanism, and a sealing mechanism;

[0006] The housing is a hollow tubular structure with openings at both ends; an annular bearing groove, an annular mounting groove, and two annular sealing grooves are formed on the inner wall of the housing;

[0007] The driving mechanism includes a sealing cover, a motor assembly, a driving screw, a sliding sealing block, a limiting cylinder, and a telescopic rod; the sealing cover is provided at one end of the housing and is detachably connected to the housing, and a power connection terminal is provided on the sealing cover; the motor assembly, the driving screw, the sliding sealing block, and the limiting cylinder are all housed in the housing; the motor assembly is connected to the housing, and the motor assembly is electrically connected to an external circuit through the power connection terminal; the driving shaft of the motor assembly is drivingly connected to one end of the driving screw, and the sliding sealing block is connected to the end of the driving screw away from the motor assembly; one end of the limiting cylinder is connected to the motor assembly, and a part of the driving screw is inserted into the limiting cylinder; the telescopic rod includes a limiting slider and a driving cylinder, and the driving cylinder is a hollow cylindrical structure with one end open; the open end of the driving cylinder is connected to the limiting slider, and a threaded hole is provided on the limiting slider, and the threaded hole communicates with the driving cylinder; the driving screw is adapted to the threaded hole, and the driving screw is inserted into the threaded hole and is screwed to the limiting slider; the sliding sealing block is inserted into the driving cylinder and is slidably connected to the driving cylinder; the limiting slider is a polygonal columnar structure, the limiting slider is adapted to the limiting cylinder, and the limiting slider is inserted into the limiting cylinder and is slidably connected to the limiting cylinder;

[0008] The sealing mechanism is provided in the housing, and the sealing mechanism includes an end cover ring, a bearing ring, and two sealing rings; the end cover ring, the bearing ring, and the two sealing rings are all sleeved on the driving cylinder and are all slidably connected to the driving cylinder; the annular mounting groove is provided at one end of the housing away from the sealing cover, the end cover ring is adapted to the annular mounting groove, and a part of the end cover ring is inserted into the annular mounting groove and is connected to the housing; the two sealing rings are respectively provided on both sides of the bearing ring, the bearing ring is adapted to the annular bearing groove, and a part of the bearing ring is inserted into the annular bearing groove and is connected to the housing; the sealing ring is adapted to the annular sealing groove, and a part of the sealing ring is inserted into the annular sealing groove and is connected to the housing.

[0009] In one embodiment, a second annular sealing groove is provided on the outer wall of the sliding sealing block, and an annular elastic sealing ring is provided in the second annular sealing groove of the sliding sealing block, and the annular elastic sealing ring is in sliding contact with the inner wall of the driving cylinder.

[0010] In one embodiment, the annular elastic sealing ring is a rubber sealing ring.

[0011] In one embodiment, the annular elastic sealing ring is a silica gel sealing ring.

[0012] In one embodiment, the sealing ring is provided with an inner air sealing lip and an outer air sealing lip. The inner air sealing lip abuts against the driving cylinder, and the outer air sealing lip abuts against the outer shell.

[0013] In one embodiment, the driving cylinder and the limiting slider are integrally formed.

[0014] In one embodiment, the limiting slider has a cuboid structure.

[0015] In one embodiment, annular reinforcing ribs are provided on the outer wall of the outer shell.

[0016] In one embodiment, a plurality of annular reinforcing ribs are provided on the outer wall of the outer shell.

[0017] In one embodiment, anti-slip patterns are provided on the outer wall of the outer shell.

[0018] During the working process of the sealing structure of the above-mentioned electric pneumatic telescopic rod, the external circuit is electrically connected to the motor assembly through the power connection terminal. The motor assembly drives the driving screw to rotate. By the movement of the lead screw away, the driving screw rotates to drive the telescopic rod to move up and down along the limiting cylinder. The load-bearing ring increases the structural strength of the outer shell, thereby increasing the structural stability of the sealing structure of the electric pneumatic telescopic rod. Two sealing rings are arranged between the outer shell and the driving cylinder, forming two airtight protection layers, greatly increasing the airtightness of the sealing structure of the electric pneumatic telescopic rod and meeting the airtightness requirements for electric pneumatic telescopic rods in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the sealing structure of the electric pneumatic telescopic rod in one embodiment;

[0020] Figure 2 For Figure 1 It is a schematic structural diagram of another perspective of the sealing structure of the electric pneumatic telescopic rod in the embodiment;

[0021] Figure 3 It is a schematic disassembled structural diagram of the sealing structure of the electric pneumatic telescopic rod in one embodiment;

[0022] Figure 4 It is a schematic disassembled structural diagram of the sealing structure of the electric pneumatic telescopic rod in one embodiment;

[0023] Figure 5 It is a schematic disassembled structural diagram of the sealing structure of the electric pneumatic telescopic rod in another embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following will provide a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below. In the description of the present invention, it should be understood that 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", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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, and thus should not be construed as a limitation of the present invention.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0026] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0029] Please refer to Figures 1 to 5 , the present invention provides a sealing structure 10 for an electric pneumatic telescopic rod, and the sealing structure 10 of the electric pneumatic telescopic rod includes: a housing 100, a driving mechanism 200 and a sealing mechanism 300.

[0030] The housing 100 is a hollow tubular structure with openings at both ends. An annular bearing groove (not shown in the figure), an annular mounting groove (not shown in the figure) and two annular sealing grooves (not shown in the figure) are formed on the inner wall of the housing 100.

[0031] The driving mechanism 200 includes a sealing cover 210, a motor assembly 220, a driving screw 230, a sliding sealing block 240, a limiting cylinder 250 and a telescopic rod 260. The sealing cover 210 is covered on one end of the housing 100 and is detachably connected to the housing 100, and an electrical connection terminal 211 is provided on the sealing cover 210. The motor assembly 220, the driving screw 230, the sliding sealing block 240 and the limiting cylinder 250 are all received in the housing 100. The motor assembly 220 is connected to the housing 100, and the motor assembly 220 is electrically connected to an external circuit through the electrical connection terminal 211. The driving shaft of the motor assembly 220 is drivingly connected to one end of the driving screw 230, and the sliding sealing block 240 is connected to the end of the driving screw 230 away from the motor assembly 220. One end of the limiting cylinder 250 is connected to the motor assembly 220, and a part of the driving screw 230 is inserted into the limiting cylinder 250. The telescopic rod 260 includes a limiting slider 261 and a driving cylinder 262, and the driving cylinder 262 is a hollow cylindrical structure with an opening at one end. The open end of the driving cylinder 262 is connected to the limiting slider 261. In this embodiment, the driving cylinder 262 and the limiting slider 261 are integrally formed to increase the structural strength and structural stability of the telescopic rod 260.

[0032] The limiting slider 261 is provided with a threaded hole 201. The threaded hole 201 communicates with the driving cylinder 262. The driving screw 230 is adapted to the threaded hole 201. The driving screw 230 is inserted into the threaded hole 201 and is screwed to the limiting slider 261. The sliding seal block 240 is inserted into the driving cylinder 262 and is slidably connected to the driving cylinder 262. The limiting slider 261 has a polygonal columnar structure and is adapted to the limiting cylinder 250. The limiting slider 261 is inserted into the limiting cylinder 250 and is slidably connected to the limiting cylinder 250. In this embodiment, the limiting slider 261 has a cuboid structure.

[0033] The sealing mechanism 300 is disposed within the housing 100. The sealing mechanism 300 includes an end cap ring 310, a load-bearing ring 320, and two sealing rings 330. The end cap ring 310, the load-bearing ring 320, and the two sealing rings 330 are all sleeved on the driving cylinder 262 and are all slidably connected to the driving cylinder 262. An annular mounting groove is formed at one end of the housing 100 away from the sealing cover 210. The end cap ring 310 is adapted to the annular mounting groove. The end cap ring 310 is partially inserted into the annular mounting groove and is connected to the housing 100. The two sealing rings 330 are respectively disposed on both sides of the load-bearing ring 320. The load-bearing ring 320 is adapted to the annular load-bearing groove. The load-bearing ring 320 is partially inserted into the annular load-bearing groove and is connected to the housing 100. The sealing ring 330 is adapted to the annular sealing groove. The sealing ring 330 is partially inserted into the annular sealing groove and is connected to the housing 100.

[0034] In order to improve the sealing performance of the sliding seal block 240, in one embodiment, a second annular sealing groove 202 is formed on the outer wall of the sliding seal block 240. An annular elastic sealing ring 241 is disposed within the second annular sealing groove 202 of the sliding seal block 240. The annular elastic sealing ring 241 is in sliding contact with the inner wall of the driving cylinder 262. In this embodiment, the annular elastic sealing ring 241 is a rubber sealing ring. In another embodiment, the annular elastic sealing ring 241 is a silicone sealing ring. Thus, the sealing performance of the sliding seal block 240 is improved.

[0035] In order to improve the sealing performance of the sealing ring 330, in one embodiment, the sealing ring 330 is provided with an inner air sealing lip 331 and an outer air sealing lip 332. The inner air sealing lip 331 abuts against the driving cylinder 262, and the outer air sealing lip 332 abuts against the housing 100. Thus, the sealing performance of the sealing ring 330 is improved.

[0036] In order to improve the structural strength of the housing 100, in one embodiment, an annular reinforcing rib is provided on the outer wall of the housing 100. In this embodiment, a plurality of annular reinforcing ribs are provided on the outer wall of the housing 100. In one embodiment, anti-slip lines are provided on the outer wall of the housing 100 to improve the anti-slip performance of the housing 100. Thus, the structural strength and structural stability of the housing 100 are improved.

[0037] During the working process of the sealing structure 10 of the above-mentioned electric pneumatic telescopic rod 260, the external circuit is electrically connected to the motor assembly 220 through the power connection terminal 211. The motor assembly 220 drives the driving screw 230 to rotate. By using the principle of the screw moving away, the driving screw 230 rotates to drive the telescopic rod 260 to move up and down along the limiting cylinder 250. The bearing ring 320 increases the structural strength of the outer shell 100, thereby increasing the structural stability of the sealing structure 10 of the electric pneumatic telescopic rod 260. Two sealing rings 330 are arranged between the outer shell 100 and the driving cylinder 262, forming two airtight protection layers, greatly increasing the airtightness of the sealing structure 10 of the electric pneumatic telescopic rod 260 and meeting the airtightness requirements of the electric pneumatic telescopic rod 260 in the market.

[0038] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0039] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A sealing structure of an electric pneumatic telescopic rod, characterized in that, Comprising: A housing, a driving mechanism, and a sealing mechanism; The housing is a hollow tubular structure with openings at both ends; an annular bearing groove, an annular mounting groove, and two annular sealing grooves are formed on the inner wall of the housing; The driving mechanism includes a sealing cover, a motor assembly, a driving screw, a sliding sealing block, a limiting cylinder, and a telescopic rod; the sealing cover is provided at one end of the housing and is detachably connected to the housing, and a power connection terminal is provided on the sealing cover; the motor assembly, the driving screw, the sliding sealing block, and the limiting cylinder are all received in the housing; the motor assembly is connected to the housing, and the motor assembly is electrically connected to an external circuit through the power connection terminal; the driving shaft of the motor assembly is drivingly connected to one end of the driving screw, and the sliding sealing block is connected to the end of the driving screw away from the motor assembly; one end of the limiting cylinder is connected to the motor assembly, and a part of the driving screw is inserted into the limiting cylinder; the telescopic rod includes a limiting slider and a driving cylinder, and the driving cylinder is a hollow cylindrical structure with an opening at one end; the opening end of the driving cylinder is connected to the limiting slider, and a threaded hole is formed in the limiting slider, and the threaded hole communicates with the driving cylinder; the driving screw is adapted to the threaded hole, and the driving screw is inserted into the threaded hole and is screwed to the limiting slider; the sliding sealing block is inserted into the driving cylinder and is slidably connected to the driving cylinder; the limiting slider is a polygonal columnar structure, the limiting slider is adapted to the limiting cylinder, and the limiting slider is inserted into the limiting cylinder and is slidably connected to the limiting cylinder; The sealing mechanism is provided in the housing, and the sealing mechanism includes an end cover ring, a bearing ring, and two sealing rings; the end cover ring, the bearing ring, and the two sealing rings are all sleeved on the driving cylinder and are all slidably connected to the driving cylinder; the annular mounting groove is formed at the end of the housing away from the sealing cover, the end cover ring is adapted to the annular mounting groove, and a part of the end cover ring is inserted into the annular mounting groove and is connected to the housing; the two sealing rings are respectively arranged on both sides of the bearing ring, the bearing ring is adapted to the annular bearing groove, and a part of the bearing ring is inserted into the annular bearing groove and is connected to the housing; the sealing ring is adapted to the annular sealing groove, and a part of the sealing ring is inserted into the annular sealing groove and is connected to the housing; A second annular sealing groove is formed on the outer wall of the sliding sealing block, and an annular elastic sealing ring is arranged in the second annular sealing groove of the sliding sealing block, and the annular elastic sealing ring is in sliding contact with the inner wall of the driving cylinder; The sealing ring is provided with an inner air sealing lip and an outer air sealing lip, the inner air sealing lip abuts against the driving cylinder, and the outer air sealing lip abuts against the housing.

2. The sealing structure of the electric pneumatic telescopic rod according to claim 1, characterized in that The annular elastic sealing ring is a rubber sealing ring.

3. The sealing structure of the electric pneumatic telescopic rod according to claim 1, characterized in that, The annular elastic sealing ring is a silica gel sealing ring.

4. The sealing structure of the electric pneumatic telescopic rod according to claim 1, characterized in that, The driving cylinder and the limiting slider are integrally formed.

5. The sealing structure of the electric pneumatic telescopic rod according to claim 1, characterized in that, The limiting slider is a cuboid structure.

6. The sealing structure of the electric pneumatic telescopic rod according to claim 1, characterized in that, An annular reinforcing rib is provided on the outer wall of the housing.

7. The sealing structure of the electric pneumatic telescopic rod according to claim 6, characterized in that, A number of annular reinforcing ribs are provided on the outer wall of the housing.

8. The sealing structure of the electric pneumatic telescopic rod according to claim 1, characterized in that, Anti-slip patterns are provided on the outer wall of the housing.

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