Valve rod protection structure of discharge valve

Abstract

The valve rod protection structure comprises a valve body, a valve element, a valve rod and a driving mechanism, the driving mechanism is connected to one end of the valve body, the valve element is located in the valve body, the valve rod stretches into the valve body, and the two ends of the valve rod are connected with the driving mechanism and the valve element. The valve rod and the valve element can move in the axial direction of the valve rod under the action of the driving mechanism. The valve rod is sleeved with a telescopic pipe structure, the two ends of the telescopic pipe structure are fixedly connected with the inner wall of the valve body and the valve element respectively, the telescopic pipe structure comprises at least two rigid unit pipe fittings, the at least two rigid unit pipe fittings are sequentially connected in a sleeved mode in the axial direction of the valve rod, and the adjacent unit pipe fittings are sealed through a sealing structure. The valve rod is protected through the telescopic pipe structure formed by the rigid unit pipe fittings, the discharging valve can be suitable for materials with dust, and the service life of the discharging valve is prolonged.

Description

Technical Field

[0001] This utility model relates to a valve stem protection structure for a discharge valve. Background Technology

[0002] A filtration device is a piece of equipment with a filtration function that removes impurities from a medium to obtain a purer medium. A discharge valve is a device installed on the filtration device to control the discharge of materials. Its structure includes a valve body, a valve core assembly, a valve seat, and a valve stem. The valve body has a flow channel, an inlet connecting the flow channel to the inside of the filtration device, and an outlet connecting the flow channel to the outside. Driven by the valve stem, the valve core assembly either engages with or disengages from the valve seat installed at the inlet, thus cutting off or connecting the flow channel.

[0003] The applicant's prior patent CN201820722416.8 discloses a bellows mounting structure for a discharge valve, including a valve body, a valve core assembly, a valve stem, and a bellows. The bellows is sleeved around the valve stem to form a sealing structure, achieving dynamic sealing when the valve core assembly is driven. However, when this bellows seal is used with dusty materials, dust accumulates on the bellows. During bellows expansion and contraction, material can easily accumulate in the troughs of the bellows, leading to damage if not cleaned promptly. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a valve stem protection structure for a discharge valve.

[0005] The technical solution adopted by this utility model is as follows: A valve stem protection structure for a discharge valve includes a valve body, a valve core, a valve stem, and a drive mechanism. The drive mechanism is connected to one end of the valve body, the valve core is located inside the valve body, and the valve stem extends into the valve body with its two ends connected to the drive mechanism and the valve core. Under the action of the drive mechanism, the valve stem and the valve core can be displaced along the axial direction of the valve stem. The valve stem is fitted with a telescopic tube structure, and the two ends of the telescopic tube structure are respectively fixedly connected to the inner wall of the valve body and the valve core. The telescopic tube structure includes at least two rigid unit tubes, and at least two rigid unit tubes are sequentially sleeved along the axial direction of the valve stem. Adjacent unit tubes are sealed by a sealing structure.

[0006] The sealing structure between adjacent unit pipe fittings includes a sealing groove located on the inner circumference of the unit pipe fitting on the outer periphery and an O-ring embedded in the sealing groove.

[0007] The sealing groove is provided with a first gasket. The first gasket is located on the side of the O-ring near the end of the unit pipe fitting located on the outer periphery that mates with the adjacent unit pipe fitting. The inner periphery of the first gasket is attached to the outer wall of the adjacent unit pipe fitting located on the inner periphery.

[0008] Between adjacent unit pipe fittings, the end of the inner circumferential surface of the unit pipe fitting located on the outer periphery that mates with the adjacent unit pipe fitting is provided with a scraper groove. A scraper ring is provided in the scraper groove, and the inner circumference of the scraper ring forms a scraper tip that fits against the outer circumferential surface of the adjacent unit pipe fitting located on the inner periphery.

[0009] The unit fitting located on the outer periphery is connected to a pressure cap outside the scraper groove. An axial elastic pressure element is provided inside the scraper groove, and the axial elastic pressure element exerts an axial elastic pressure on the scraper ring towards the pressure cap.

[0010] The axial elastic pressure component is a butterfly spring assembly, and a second washer is provided between the axial elastic pressure component and the scraper ring.

[0011] The telescopic tube structure is fixed at both ends with a first flange and a second flange, respectively. The first flange is flange-connected to the valve body, and the second flange is flange-connected to the valve core.

[0012] The outer end of the first flange protrudes to form a limiting step ring, and the inner wall of the valve body is provided with a limiting step groove that cooperates with the limiting step ring. The limiting step ring and the limiting step groove cooperate to form a radial positioning effect on the telescopic pipe structure.

[0013] The telescopic tube structure and the valve stem are fitted with a clearance. The depth of the limiting step groove is greater than the thickness of the limiting step ring, so that a breathing chamber is formed between the limiting step ring and the valve body. The valve body is provided with a breathing hole that connects the breathing chamber and the valve body.

[0014] The telescopic tube structure consists of two unit tubes, namely a first sleeve and a second sleeve. The first sleeve and the second sleeve are joined together to form a telescopic tube structure. The outer ends of the first sleeve and the second sleeve are respectively fixedly connected to the inner wall of the valve body and the valve core.

[0015] The beneficial effects of this utility model are as follows: This utility model protects the valve stem through a telescopic tube structure formed by rigid unit pipe fittings, which can be applied to materials with dust and improve the service life of the discharge valve. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Enlarged diagram of part A in the middle;

[0019] Figure 3 for Figure 1 Enlarged diagram of section B;

[0020] Figure 4 for Figure 1 Enlarged diagram of section C in the middle;

[0021] In the figure, valve body-1, limiting step groove-101, breather hole-102, valve core-2, valve stem-3, drive mechanism-4, first sleeve-5, first flange-501, limiting step ring-502, second sleeve-6, second flange-601, sealing groove-602, scraper groove-603, O-ring seal-7, first gasket-8, scraper ring-9, scraper tip-901, gland-10, axial elastic pressure element-11, second gasket-12. Detailed Implementation

[0022] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0023] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0024] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0025] like Figure 1 As shown, a discharge valve includes a valve body 1, a valve core 2, a valve stem 3, and a drive mechanism 4. The drive mechanism 4 is connected to one end of the valve body 1. The valve core 2 is located inside the valve body 1. The valve stem 3 extends into the valve body 1, and its two ends are connected to the drive mechanism 4 and the valve core 2. Under the action of the drive mechanism 4, the valve stem 3 and the valve core 2 can be displaced along the axial direction of the valve stem 3. The valve body 1 has a valve port, and the discharge valve is opened and closed by driving the valve core 2 to displace along the axial direction of the valve stem 3. Specifically, the drive mechanism 4 can be an electric drive, a hydraulic drive, or other drive device. In this embodiment, the drive mechanism 4 adopts a hydraulic drive device, and the valve stem 3 is a hydraulic rod or a drive rod that is linked with a hydraulic rod.

[0026] The connection between the valve stem and the valve body is prone to leakage. To address this, this embodiment includes a valve stem protection structure on the outside of the valve stem 3. Specifically, a telescopic tube structure is fitted over the valve stem 3. The two ends of the telescopic tube structure are fixedly connected to the inner wall of the valve body 1 and the valve core 2, respectively. The telescopic tube structure comprises at least two rigid unit pipes, which are sequentially sleeved along the axial direction of the valve stem 3. Adjacent unit pipes are sealed together by a sealing structure. Compared to the prior art using a bellows as a valve stem protection structure to prevent leakage, this embodiment protects the valve stem with a telescopic tube structure formed by rigid unit pipes, making it suitable for materials with dust and improving the service life of the discharge valve.

[0027] Specifically, such as Figure 1 As shown, in this embodiment, the telescopic tube structure consists of two unit tubes, namely a first sleeve 5 and a second sleeve 6. The second sleeve 6 is sleeved outside the first sleeve 5 to form the telescopic tube structure, as shown. Figure 3 , Figure 4 As shown, the outer ends of the first sleeve 5 and the second sleeve 6 are fixedly provided with a first flange 501 and a second flange 601. The first flange 501 is flange-connected to the valve body 1, and the second flange 601 is flange-connected to the valve core 2, so that the position of the first sleeve 5 is fixed relative to the valve body 1, and the position of the second sleeve 6 is fixed relative to the valve core 2. When the valve core 2 moves along the axial direction of the valve stem 3, the sealing structure between adjacent unit pipes prevents materials from entering the telescopic pipe structure.

[0028] like Figure 2 As shown, the sealing structure between adjacent unit pipe fittings includes a sealing groove 602 disposed on the inner circumference of the second sleeve 6 and an O-ring 7 embedded in the sealing groove 602. A first gasket 8 is provided in the sealing groove 602. The first gasket 8 is located on the side of the O-ring 7 near the end of the second sleeve 6 that mates with the first sleeve 5, that is, the end away from the second flange 601. The inner circumference of the first gasket 8 is in contact with the outer wall of the first sleeve 5.

[0029] Furthermore, the end of the second sleeve 6 that mates with the first sleeve 5 is provided with a scraper groove 603. A scraper ring 9 is provided within the scraper groove 603, and the inner circumference of the scraper ring 9 forms a scraper tip 901 that fits against the outer circumference of the first sleeve 5. The scraper ring 9 enables the telescopic tube structure to clean the outer circumference of the first sleeve 5 during telescopic movement, preventing material from adhering to the outer circumference of the first sleeve 5 and being carried into the sealing groove 602 or even further into the inner cavity of the telescopic tube structure during the telescopic process.

[0030] The end of the second sleeve 6 that mates with the first sleeve 5 is connected to a pressure cap 10 via a flange outside the scraper groove 603. An axial elastic pressure member 11 is provided inside the scraper groove 603. The axial elastic pressure member 11 forms an axial elastic pressure on the scraper ring 9 in the direction of the pressure cap 10, thereby fixing the relative position of the scraper ring 9.

[0031] like Figure 4 As shown, the outer end of the first flange 501 protrudes to form a limiting step ring 502. The inner wall of the valve body 1 is provided with a limiting step groove 101 that cooperates with the limiting step ring 502. The limiting step ring 502 and the limiting step groove 101 cooperate to form a radial positioning effect on the telescopic tube structure. In this embodiment, the telescopic tube structure and the valve stem 3 are clearance-fitted. The depth of the limiting step groove 101 is greater than the thickness of the limiting step ring 502, so that a breathing chamber is formed between the limiting step ring 502 and the valve body 1. The valve body 1 is provided with a breathing hole 102 that connects the breathing chamber and the outside of the valve body 1. With this configuration, the cavity formed between the telescopic tube structure and the valve stem 3 is kept in communication with the outside through the breathing chamber and the breathing hole 102. During the telescopic process, the volume of the cavity formed between the telescopic tube structure and the valve stem 3 changes dynamically, but the internal pressure always remains at atmospheric pressure, avoiding pressure changes from affecting the normal opening and closing of the discharge valve.

[0032] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A valve stem protection structure for a discharge valve, comprising a valve body (1), a valve core (2), a valve stem (3), and a drive mechanism (4), wherein the drive mechanism (4) is connected to one end of the valve body (1), the valve core (2) is located inside the valve body (1), the valve stem (3) extends into the valve body (1) and its two ends are connected to the drive mechanism (4) and the valve core (2), and the valve stem (3) and the valve core (2) can be displaced along the axial direction of the valve stem (3) under the action of the drive mechanism (4); the valve stem (3) is sleeved with a telescopic tube structure, and the two ends of the telescopic tube structure are respectively fixedly connected to the inner wall of the valve body (1) and the valve core (2), characterized in that: The telescopic pipe structure includes at least two rigid unit pipes and at least two rigid unit pipes are sequentially sleeved along the axial direction of the valve stem (3), and adjacent unit pipes are sealed by a sealing structure.

2. The valve stem protection structure of the discharge valve according to claim 1, characterized in that: The sealing structure between adjacent unit pipe fittings includes a sealing groove (602) located on the inner circumference of the unit pipe fitting on the outer periphery and an O-ring (7) embedded in the sealing groove (602).

3. The valve stem protection structure of the discharge valve according to claim 2, characterized in that: The sealing groove (602) is provided with a first gasket (8). The first gasket (8) is located on the side of the O-ring (7) near the end of the unit pipe fitting located on the outer periphery that mates with the adjacent unit pipe fitting. The inner periphery of the first gasket (8) is attached to the outer wall of the adjacent unit pipe fitting located on the inner periphery.

4. The valve stem protection structure of the discharge valve according to claim 2, characterized in that: Between adjacent unit pipe fittings, a scraper groove (603) is provided at the end of the inner circumferential surface of the unit pipe fitting located on the outer periphery that mates with the adjacent unit pipe fitting. A scraper ring (9) is provided in the scraper groove (603), and a scraper tip (901) is formed on the inner periphery of the scraper ring (9) that fits against the outer circumferential surface of the adjacent unit pipe fitting located on the inner periphery.

5. The valve stem protection structure of the discharge valve according to claim 4, characterized in that: The unit fitting located on the outer periphery is connected to a pressure cap (10) outside the scraper groove (603). An axial elastic pressure member (11) is provided in the scraper groove (603). The axial elastic pressure member (11) forms an axial elastic pressure on the scraper ring (9) in the direction of the pressure cap (10).

6. The valve stem protection structure of the discharge valve according to claim 5, characterized in that: The axial elastic pressure member (11) is a butterfly spring assembly, and a second washer (12) is provided between the axial elastic pressure member (11) and the scraper ring (9).

7. The valve stem protection structure of the discharge valve according to claim 1, characterized in that: The telescopic tube structure is fixed with a first flange (501) and a second flange (601) at both ends. The first flange (501) is flange-connected to the valve body (1), and the second flange (601) is flange-connected to the valve core (2).

8. The valve stem protection structure of the discharge valve according to claim 7, characterized in that: The outer end of the first flange (501) protrudes to form a limiting step ring (502), and the inner wall of the valve body (1) is provided with a limiting step groove (101) that cooperates with the limiting step ring (502). The limiting step ring (502) and the limiting step groove (101) cooperate to form a radial positioning effect on the telescopic pipe structure.

9. The valve stem protection structure of the discharge valve according to claim 8, characterized in that: The telescopic tube structure and the valve stem (3) are fitted with a clearance. The depth of the limiting step groove (101) is greater than the thickness of the limiting step ring (502) so that a breathing chamber is formed between the limiting step ring (502) and the valve body (1). The valve body (1) is provided with a breathing hole (102) that connects the breathing chamber and the outside of the valve body (1).

10. The valve stem protection structure of the discharge valve according to any one of claims 1-9, characterized in that: The telescopic pipe structure consists of two unit pipes, namely a first sleeve (5) and a second sleeve (6). The first sleeve (5) and the second sleeve (6) are connected inside and outside to form a telescopic pipe structure. The outer end of the first sleeve (5) and the outer end of the second sleeve (6) are respectively fixedly connected to the inner wall of the valve body (1) and the valve core (2).

Images