Valve seat gland structure and ball valve

Abstract

The utility model discloses a valve seat gland structure and a ball valve, a gland main body is arranged corresponding to a pressing ring, and an elastic ring is clamped between the gland main body and the pressing ring. According to the valve seat pressing cover structure and the ball valve, the valve cover is divided into the pressing ring, the pressing cover body and the elastic ring, the connecting effect is achieved through the pressing cover body, the effect of pressing filler is achieved through the pressing ring, and the elastic ring is arranged between the pressing cover body and the pressing ring to provide elastic force. Fastening force provided by the gland body acts on the pressing ring through the elastic ring, and finally the lower surface of the pressing ring presses packing in the valve rod base. Only the material and size precision of the pressing ring are improved, the machining difficulty and cost are both controlled, the elastic ring can assist the filler in providing elastic force, and the pressing ring can continuously press the filler; as the pressing ring is independently used for pressing the filler, the material and size conditions of the gland main body can be relaxed, and the gland has the advantages of meeting the performance and reducing the cost at the same time.

Description

Technical Field

[0001] The utility model relates to the field of ball valve structures, in particular to a valve seat gland structure and a ball valve. Background Art

[0002] As an important part of the valve system, the design and manufacturing quality of the ball valve packing gland directly affect the overall performance and service life of the ball valve. During the working process of the ball valve, the packing gland is set on the valve stem to seal and fix the packing, effectively preventing the leakage of the medium and ensuring the normal operation of the valve. When manufacturing the packing gland of the ball valve, corrosion-resistant and high-strength materials are usually used to cope with the harsh working environment. At the same time, precise processing technology and strict quality control ensure the dimensional accuracy and surface finish of the gland, thereby improving the sealing performance of the valve.

[0003] In order to efficiently and accurately press the packing, the gland needs to have precise structural dimensions and high structural strength. In the process of tightening, the gland has a large tightening force to achieve a good sealing effect. At this point, a contradiction arises. The high strength and high tightening force of the gland make it easy for the gland and the valve stem to be damaged when they are matched with the valve, which affects the use effect and increases the difficulty of maintenance. Utility Model Content

[0004] The main purpose of the utility model is to provide a valve seat gland structure and a ball valve, aiming to solve the problem that the gland has high strength and high fastening force characteristics. When it is matched with the valve, structural damage is easy to occur between the gland and the valve stem, which affects the use effect and increases the difficulty of maintenance.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a valve seat gland structure, which is arranged corresponding to the valve stem, and includes:

[0006] A pressure ring, which is ring-shaped and has a first through hole in the middle for the valve stem to pass through;

[0007] A gland body, arranged corresponding to the compression ring, a valve stem passage for the valve stem to pass through the gland body in the thickness direction, and at least two connection positions are arranged on the circumference of the gland body;

[0008] The elastic ring is clamped between the gland body and the pressure ring. The elastic ring is annular and a second through hole for the valve stem to pass through is arranged in the middle thereof.

[0009] Furthermore, a protruding bezel is provided on one side of the pressure ring in the thickness direction close to the pressure cover body, and the elastic ring is detachably sleeved on the protruding bezel.

[0010] Furthermore, the outer wall of the protruding table ring forms a clearance fit with the inner wall of the valve stem channel.

[0011] Furthermore, an inner wall of the valve stem channel and an outer wall of the valve stem form a clearance fit.

[0012] Furthermore, the gland body wraps the outer wall of the compression ring.

[0013] Furthermore, the valve seat gland structure also includes an O-ring, which is clamped between the gland body and the pressure ring and sleeves the elastic ring.

[0014] Furthermore, the elastic ring is a butterfly spring.

[0015] The utility model also provides a ball valve, comprising a valve body, a valve stem and the valve seat gland structure.

[0016] Furthermore, the gland body is fixed to the valve body by a bolt assembly, wherein the bolt assembly comprises a screw and a nut, wherein the screw is inserted from a side of the gland body away from the pressure ring, and the screw fixes the gland body in the circumferential direction.

[0017] Furthermore, the valve body includes a valve main body and a valve seat portion connected to both ends of the valve main body in the length direction, a valve stem seat is arranged on the outer wall of the valve main body, the pressure cover main body is connected to the valve stem seat through a bolt structure, and a limiting groove is arranged on the valve stem seat, and the limiting groove accommodates the pressure cover main body to limit circumferential rotation.

[0018] The valve seat gland structure and ball valve provided by the utility model divide the valve cover into a compression ring, a gland body and an elastic ring. The connection effect is achieved through the gland body, and the effect of pressing the packing is achieved through the compression ring. The elastic ring is arranged between the gland body and the compression ring to provide elastic force. When the gland body is connected, the fastening force provided by the gland body acts on the compression ring through the elastic ring, and finally the lower surface of the compression ring presses the packing in the valve stem seat. Only by improving the material and dimensional accuracy of the compression ring, the difficulty and cost of processing can be controlled. The elastic ring can also assist the packing in providing elastic force, so that the compression ring can continuously press the packing. Since the compression ring is used alone to press the packing, the material and dimensional conditions of the gland body can be relaxed, thereby having the advantages of both performance satisfaction and cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of the pressure ring in the valve seat gland structure of the first embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional schematic diagram of the gland body in the valve seat gland structure of the first embodiment of the utility model;

[0021] Figure 3 It is a cross-sectional schematic diagram of an elastic ring in the valve seat gland structure of the first embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the use of the valve seat gland structure of the first embodiment of the utility model;

[0023] Figure 5 This is a three-dimensional schematic diagram (section) of the installation of the valve seat gland structure of the first embodiment of the utility model;

[0024] Figure 6 This is the installation front view (section) of the valve seat gland structure of the first embodiment of the utility model;

[0025] Figure 7 This is a schematic diagram of the valve seat gland structure in the ball valve of the first embodiment of the utility model;

[0026] Figure 8 This is the installation front view (section) of the valve seat gland structure of the second embodiment of the utility model;

[0027] Fig. 9 It is the installation front view (section) of the valve seat gland structure of the third embodiment of the utility model.

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "one", "said", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0031] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0032] Reference Figures 1 to 9 In one embodiment of the utility model, a valve seat gland structure is provided corresponding to the valve stem 001, including:

[0033] The pressure ring 100 is annular and has a first through hole 110 in the middle for the valve stem 001 to pass through;

[0034] A gland body 200 is provided corresponding to the compression ring 100. A valve stem passage 210 for the valve stem 001 to pass through the gland body 200 is penetrated in the thickness direction of the gland body 200. At least two connection positions 220 are provided in the circumferential direction of the gland body 200.

[0035] The elastic ring 300 is clamped between the gland body 200 and the pressure ring 100 . The elastic ring 300 is annular and has a second through hole 310 in the middle thereof for the valve stem 001 to pass through.

[0036] In the prior art, the high strength and high fastening force characteristics of the gland make it easy for structural damage to occur between the gland and the valve stem when it is matched with the valve, which affects the use effect and increases the difficulty of maintenance.

[0037] In the utility model, a valve stem seat 021 is provided on the valve body 002 corresponding to the valve stem 001, the valve stem 001 is installed on the valve stem seat 021, and the packing is installed in the valve stem seat 021. The valve seat gland structure includes a gland body 200, a pressure ring 100 and an elastic ring 300. The pressure ring 100 is annular and a first through hole 110 is provided in the middle for the valve stem 001 to pass through, and the lower surface of the pressure ring 100 is used to compress the packing in the valve stem seat 021. The elastic ring 300 is annular and a second through hole 310 is provided in the middle for the valve stem 001 to pass through. The elastic ring 300 is sleeved on the valve stem 001 and is located on the upper surface of the pressure ring 100. The gland body 200 is provided corresponding to the pressure ring 100, and clamps the elastic ring 300 together with the pressure ring 100. The gland body 200 is penetrated by a valve stem channel 210 for the valve stem 001 to pass through in the thickness direction. The gland body 200 is arranged through the valve stem 001 through the valve stem passage 210, and then connected to the valve stem seat 021 through the connection position 220 arranged on the circumference of the gland body 200. After the gland body 200 is connected, the fastening force provided by the gland body 200 acts on the pressure ring 100 through the elastic ring 300, and finally the lower surface of the pressure ring 100 presses the packing in the valve stem seat 021.

[0038] In summary, the valve cover is divided into a pressure ring 100, a pressure cover body 200 and an elastic ring 300. The connection effect is achieved through the pressure cover body 200, and the effect of pressing the packing is achieved through the pressure ring 100. The elastic ring 300 is arranged between the pressure cover body 200 and the pressure ring 100 to provide elastic force. When the pressure cover body 200 is connected, the fastening force provided by the pressure cover body 200 acts on the pressure ring 100 through the elastic ring 300, and finally the lower surface of the pressure ring 100 presses the packing in the valve stem seat 021. Only by improving the material and dimensional accuracy of the pressure ring 100, the difficulty and cost of processing can be controlled. The elastic ring 300 can also assist the packing in providing elastic force, so that the pressure ring 100 can continuously press the packing. Since the pressure ring 100 is used alone to compress the packing, the material and dimensional conditions of the pressure cover body 200 can be relaxed, thereby having the advantages of both performance satisfaction and cost reduction.

[0039] Reference Figures 1 to 7 In one embodiment, a protruding bezel 120 is provided on one side of the pressure ring 100 in the thickness direction close to the pressure cover body 200 , and the elastic ring 300 is detachably mounted on the protruding bezel 120 .

[0040] In this embodiment, a protruding bezel 120 is provided on the upper surface of the pressure ring 100, so that the elastic ring 300 can be sleeved on the protruding bezel 120 during installation, thereby reducing the possibility of abnormal position of the elastic ring 300. Considering that the outer diameter of the valve stem 001 and the inner diameter of the elastic ring 300 are not convenient to match, the protruding bezel 120 is introduced to limit the position of the elastic ring 300.

[0041] Reference Figure 8 In one embodiment, the outer wall of the protruding table ring 120 forms a clearance fit with the inner wall of the valve stem channel 210 .

[0042] In this embodiment, the gland body 200, the elastic ring 300 and the pressure ring 100 are connected to form a whole. However, the gland body 200 and the pressure ring 100 are not completely matched, and a clearance fit is formed between the outer wall of the protruding table ring 120 on the pressure ring 100 and the inner wall of the valve stem channel 210 on the gland body 200. While a basic limitation is formed between the two, a strong fit is not formed between the two, and the possibility of structural damage between the gland body 200 and the pressure ring 100 is reduced.

[0043] Reference Figures 1 to 7 In one embodiment, the inner wall of the valve stem channel 210 forms a clearance fit with the outer wall of the valve stem 001 .

[0044] In this embodiment, considering that the main purpose of the utility model is to protect the gland body 200 from being damaged, the elastic ring 300 and the pressure ring 100 are introduced, so the gland body 200 no longer needs to form a strict size match with the valve stem 001. The inner wall of the valve stem channel 210 on the gland body 200 forms a clearance match with the outer wall of the valve stem 001, so the positioning of the gland body 200 does not need to be accurate, and the pressure ring 100 is used to achieve the role of accurate positioning, and the pressure ring 100 presses the packing.

[0045] Reference Fig. 9 In one embodiment, the gland body 200 wraps the outer wall of the pressure ring 100 .

[0046] In this embodiment, the shape of the pressure cover body 200 is set, and specifically a groove structure is formed on the lower surface of the pressure cover body 200, so that the outer wall of the pressure ring 100 is wrapped, so that the pressure ring 100 can be protected by the pressure cover body 200, and the corresponding elastic ring 300 between the pressure cover body 200 and the pressure ring 100 is also protected.

[0047] Reference Fig. 9In one embodiment, the valve seat gland structure further includes an O-ring 400 , which is clamped between the gland body 200 and the pressure ring 100 , and sleeves the elastic ring 300 .

[0048] In this embodiment, an O-ring 400 can be added through the cavity formed between the gland body 200 and the pressure ring 100 , and the elastic ring 300 is protected by the sealing effect formed by the O-ring 400 .

[0049] In one embodiment, the elastic ring 300 is a butterfly spring.

[0050] In this embodiment, a suitable choice of the elastic ring 300 is provided, which has the advantages of convenience and reliability. It should be noted that when there are multiple elastic rings 300, the characteristics of the butterfly spring are convenient for stacking.

[0051] Reference Figure 7 The utility model also provides a ball valve, including a valve body 002, a valve stem 001 and the above-mentioned valve seat gland structure.

[0052] In this embodiment, compared with the traditional gland structure, the aforementioned valve seat gland structure is adopted, and the possibility of structural damage and functional failure of the entire valve seat gland structure is reduced. Specifically, the structure of the valve body 002 and the valve stem 001 refers to the existing design and is not the focus of this application. By adding a valve seat gland structure to the ball valve, the probability of the valve seat gland structure being damaged is reduced, and at the same time, the packing can be better compressed.

[0053] Reference Figure 7 In one embodiment, the gland body 200 is fixed to the valve body 002 by a bolt assembly, wherein the bolt assembly includes a screw and a nut, wherein the screw is inserted from a side of the gland body 200 away from the pressure ring 100, and the screw fixes the gland body 200 in the circumferential direction.

[0054] In this embodiment, a method for fixing the cover body 200 is provided. The screw is inserted from above, and a snap-on for limiting the rotation of the screw is provided on the cover body 200. During the process of fixing the bolt assembly, the nut can be tightened from the bottom. During this process, the screw is restricted from rotating by the cover body 200.

[0055] Reference Figure 7 In one embodiment, the valve body 002 includes a valve body and a valve seat portion connected to both ends of the valve body in the length direction, a valve stem seat 021 is provided on the outer wall of the valve body, the pressure cover body 200 is connected to the valve stem seat 021 through a bolt structure, and a limiting groove 022 is provided on the valve stem seat 021, and the limiting groove 022 accommodates the pressure cover body 200 to limit circumferential rotation.

[0056] In this embodiment, the connection between the valve seat and the valve body can be bolted, etc., and by providing a limiting groove 022 on the valve stem seat 021 of the valve body, it plays a guiding and limiting role in the fixing process of the gland body 200. Thereby, the installation process of the entire valve seat gland structure is facilitated, and the fixing effect is also optimized.

[0057] In summary, the valve seat gland structure and the ball valve provided by the utility model divide the valve cover into a pressure ring 100, a pressure cover body 200 and an elastic ring 300, the connection effect is achieved through the pressure cover body 200, and the effect of pressing the packing is achieved through the pressure ring 100, the elastic ring 300 is arranged between the pressure cover body 200 and the pressure ring 100 to provide elastic force, when the pressure cover body 200 is connected, the fastening force provided by the pressure cover body 200 acts on the pressure ring 100 through the elastic ring 300, and finally the lower surface of the pressure ring 100 presses the packing in the valve stem seat 021; only the material and dimensional accuracy of the pressure ring 100 are improved, then the difficulty and cost of processing are controlled, the elastic ring 300 can also assist the packing to provide elastic force, so that the pressure ring 100 can continuously press the packing; because the pressure ring 100 is used alone to compress the packing, the material and dimensional conditions of the pressure cover body 200 can be relaxed, thereby having the advantages of both performance satisfaction and cost reduction.

[0058] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A valve seat gland structure, arranged corresponding to a valve stem (001), characterized in that: include: A pressure ring (100) is annular and has a first through hole (110) in the middle thereof for the valve stem (001) to pass through; A gland body (200) is arranged corresponding to the compression ring (100), a valve stem passage (210) for the valve stem (001) to pass through is penetrated in the thickness direction of the gland body (200), and at least two connection positions (220) are arranged in the circumferential direction of the gland body (200); The elastic ring (300) is clamped between the gland body (200) and the pressure ring (100). The elastic ring (300) is annular and has a second through hole (310) in the middle thereof for the valve stem (001) to pass through.

2. The valve seat gland structure according to claim 1, characterized in that: A protruding bezel (120) is provided on one side of the pressure ring (100) in the thickness direction close to the pressure cover body (200), and the elastic ring (300) is detachably sleeved on the protruding bezel (120).

3. The valve seat gland structure according to claim 2, characterized in that: The outer wall of the protruding table ring (120) and the inner wall of the valve stem channel (210) form a clearance fit.

4. The valve seat gland structure according to claim 1, characterized in that: The inner wall of the valve stem channel (210) and the outer wall of the valve stem (001) form a clearance fit.

5. The valve seat gland structure according to claim 1, characterized in that: The gland body (200) wraps the outer wall of the compression ring (100).

6. The valve seat gland structure according to claim 5, characterized in that: The valve seat gland structure further comprises an O-ring (400), wherein the O-ring (400) is clamped between the gland body (200) and the pressure ring (100), and sleeves the elastic ring (300).

7. The valve seat gland structure according to any one of claims 1 to 6, characterized in that: The elastic ring (300) is a butterfly spring.

8. A ball valve, characterized in that: It comprises a valve body (002), a valve stem (001) and a valve seat gland structure as claimed in any one of claims 1 to 7.

9. The ball valve according to claim 8, characterized in that: The gland body (200) is fixed to the valve body (002) by a bolt assembly, wherein the bolt assembly comprises a screw and a nut, wherein the screw is inserted from a side of the gland body (200) away from the pressure ring (100), and the screw fixes the gland body (200) in the circumferential direction.

10. The ball valve according to claim 8, characterized in that The valve body (002) includes a valve main body and a valve seat portion connected to both ends of the valve main body in the length direction, a valve stem seat (021) is arranged on the outer wall of the valve main body, the pressure cover main body (200) is connected to the valve stem seat (021) through a bolt structure, and a limiting groove (022) is arranged on the valve stem seat (021), and the limiting groove (022) accommodates the pressure cover main body (200) to limit circumferential rotation.

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