Guiding type stop check valve

Abstract

A small column section of a valve rod assembly penetrates through a valve deck and an upper sealing seat, a large column section of the valve rod assembly is arranged in a mounting groove, and a guide rod section of the valve rod assembly penetrates through a valve clack cylinder to be in sliding fit with a guide seat; the valve clack nut is connected to the inner wall of the mounting groove and presses downwards to protrude out of the fixing ring; according to the guide type stop check valve, the end, away from the valve seat, of the valve clack cylinder is concaved inwards to form the installation groove, and the whole valve clack cylinder is of a cup-shaped structure; the large column section of the valve rod assembly is arranged in the mounting groove, and a protruding fixing ring is arranged on the peripheral wall of the large column section. The valve clack nut is connected to the mounting groove and presses the protruding fixing ring downwards to connect the valve rod assembly with the valve clack cylinder. The guide rod section penetrates through the valve clack cylinder to form position limitation with the guide seat; the valve rod assembly can guide the installation process and can conveniently verify whether the installation position of the guide seat is accurate or not; the sealing effect between the valve clack cylinder and the valve seat is improved through elastic force provided by the spiral spring.

Description

Technical Field

[0001] The utility model relates to a stop valve structure, in particular to a guide stop check valve. Background Art

[0002] The guided stop check valve is a valve that combines the functions of a stop valve and a check valve. Its main function is to control the flow direction and flow rate of fluids (such as water, steam, gas, etc.). It is mainly used to open and close the flow of fluids in pipelines. The passage or blocking of the fluid is controlled by the up and down movement of the valve disc. When the valve disc is closed, the fluid flow stops; when the valve disc is opened, the fluid can flow freely. The guided stop check valve is a multifunctional valve that plays an important role in the pipeline system. It can control the direction of fluid flow and control the start and stop of fluid flow. This valve is usually used in situations where the direction of fluid flow needs to be strictly controlled and backflow prevention is required, such as chemical, petroleum, water treatment and heating systems.

[0003] The position accuracy of the valve stem during the movement process is very important for the working safety of each component and the sealing effect. At present, there is also a guide structure for the movement of the valve stem, but the processing process is prone to affect the sealing of the valve disc. Utility Model Content

[0004] The main purpose of the utility model is to provide a guide type stop check valve, aiming to solve the problem that a guide structure is provided for the movement process of the valve stem, and the processing process of the guide structure is prone to affect the sealing of the valve disc.

[0005] In order to achieve the above object, the utility model provides a guide type stop check valve, comprising:

[0006] The valve body has a working space arranged inside, a valve seat is arranged in the middle of the working space in the height direction to separate the front chamber and the rear chamber, and a guide seat is hollowed out in the thickness direction on the valve seat;

[0007] A valve cover assembly, comprising a valve cover connected to the valve body and arranged corresponding to the valve seat, a packing being fixed inside the valve cover, and an upper sealing seat being connected to the inner end in the length direction of the valve cover;

[0008] The valve disc tube cooperates with the valve seat, and one end of the valve disc tube away from the valve seat is concave to form a mounting groove.

[0009] A valve stem assembly, comprising a small column section, a large column section and a guide rod section connected in sequence, wherein the outer peripheral wall of the large column section is provided with a protruding fixing ring, the small column section passes through the valve cover and the upper sealing seat, the large column section is arranged in the mounting groove, and the guide rod section passes through the valve disc tube to form a sliding fit with the guide seat;

[0010] A valve disc nut connected to the inner wall of the mounting groove to press down the protruding fixing ring;

[0011] A coil spring is compressed and arranged between the valve disc nut and the valve cover assembly.

[0012] Furthermore, the valve seat and the guide seat are connected by welding.

[0013] Furthermore, a first filler is arranged between a surface of the protruding fixing ring facing away from the valve disc nut and the valve disc tube.

[0014] Furthermore, a second filler is arranged between the protruding fixing ring and the valve disc nut.

[0015] Furthermore, the first filler between the protruding fixing ring and the valve disc tube, the second filler between the protruding fixing ring and the valve disc nut, and the filler in the valve cover are all flexible graphite.

[0016] Furthermore, the small column section and the large column section are connected via a positioning pin.

[0017] Furthermore, the large column section and the guide rod section are threadedly connected.

[0018] Furthermore, the small column segment, the large column segment and the guide rod segment are an integrated structure.

[0019] Further, the coil spring is compressed and arranged between the valve disc nut and the upper sealing seat.

[0020] Furthermore, the connection between the valve flap nut and the valve flap tube is one of threaded connection, clamping or welding.

[0021] The utility model provides a guided stop check valve, in which one end of the valve disc tube away from the valve seat is concave to form a mounting groove, and the entire valve disc tube constitutes a cup-shaped structure; the large column section of the valve stem assembly is arranged in the mounting groove and the outer peripheral wall is provided with a protruding fixing ring, the valve disc nut is connected to the mounting groove and the protruding fixing ring is pressed down to connect the valve stem assembly with the valve disc tube; the guide rod section passes through the valve disc tube and forms a position limit with the guide seat; the valve stem assembly can guide the installation process and can conveniently verify whether the guide seat is accurately installed; the elastic force provided by the spiral spring improves the sealing effect between the valve disc tube and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a half-section view of the first embodiment of the guide stop check valve of the utility model;

[0023] Figure 2 It is a half-section view of a second embodiment of the guide stop check valve of the utility model;

[0024] Figure 3 It is a half-section view of a guided stop check valve according to a third embodiment of the utility model.

[0025] 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

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Reference Figures 1 to 3 In one embodiment of the utility model, a guide stop check valve comprises:

[0030] The valve body 100 has a working space disposed therein, a valve seat 110 is disposed in the middle of the working space in the height direction and is divided into a front chamber 120 and a rear chamber 130, and a guide seat 140 is hollowed out in the thickness direction on the valve seat 110;

[0031] The valve cover assembly 200 includes a valve cover 210 connected to the valve body 100 and arranged corresponding to the valve seat 110, a packing is fixed in the valve cover 210, and an upper sealing seat 220 is connected to the inner end of the valve cover 210 in the length direction;

[0032] The valve disc tube 300 is matched with the valve seat 110, and one end of the valve disc tube 300 away from the valve seat 110 is concave to form a mounting groove.

[0033] The valve stem assembly 400 comprises a small column section 410, a large column section 420 and a guide rod section 430 which are connected in sequence. The outer peripheral wall of the large column section 420 is provided with a protruding fixing ring 421. The small column section 410 passes through the valve cover 210 and the upper sealing seat 220. The large column section 420 is arranged in the mounting groove. The guide rod section 430 passes through the valve disc tube 300 and forms a sliding fit with the guide seat 140.

[0034] The valve disc nut 500 is connected to the inner wall of the mounting groove to press down the protruding fixing ring 421;

[0035] The coil spring 600 is compressed and disposed between the valve disc nut 500 and the valve cover assembly 200 .

[0036] In the prior art, the position accuracy of the valve stem during movement is very important for the working safety of each component and the sealing effect. Currently, there is also a guide structure for the valve stem movement process, but its processing process is prone to affect the valve disc sealing.

[0037] In the utility model, a working space is provided inside the valve body 100. A valve seat 110 is provided in the middle of the height direction of the working space to separate it into a front chamber 120 and a rear chamber 130. A flow channel runs through the valve body 100, and a valve seat 110 is provided on the flow channel. When the valve seat 110 is closed, the flow channel is blocked. A guide seat 140 is hollowed out in the thickness direction on the valve seat 110. The specific structure of the guide seat 140 can be various, and specifically, it should have the characteristics of both guiding and non-enclosing.

[0038] The valve cover assembly 200 includes a valve cover 210 connected to the valve body 100 and arranged corresponding to the valve seat 110. A packing is fixed in the valve cover 210, and a packing cover connected to the valve cover 210 can be arranged corresponding to the packing. An upper sealing seat 220 is connected to the inner end of the valve cover 210 in the length direction. The upper sealing seat 220 is arranged to be connected to the valve cover 210, so that the overall processing difficulty is low. Specifically, the connection method of the upper sealing seat 220 can be various, which is not a property.

[0039] The valve disc tube 300 is matched with the valve seat 110. The end of the valve disc tube 300 away from the valve seat 110 is concave to form a mounting groove, and the entire valve disc tube 300 forms a cup-shaped structure. The material of the valve disc tube 300 is preferably hard alloy, which has high structural strength and excellent weather resistance.

[0040] The valve stem assembly 400 includes a small column section 410, a large column section 420 and a guide rod section 430 connected in sequence, and the above three are not limited to being connected to each other and can also be an integral structure. The outer peripheral wall of the large column section 420 is provided with a protruding fixing ring 421, and the protruding fixing ring 421 is preferably formed integrally with the large column section 420. The small column section 410 passes through the valve cover 210 and the upper sealing seat 220. The installation of the small column section 410 refers to the current common structural design and is not specifically limited. The large column section 420 is arranged in the installation groove, and the guide rod section 430 passes through the valve disc tube 300 and forms a sliding fit with the guide seat 140. The movement of the valve stem assembly 400 is guided by the fit formed between the guide rod section 430 and the guide seat 140. A typical structure of the guide seat 140 can be a mounting frame and an annular structure arranged on the mounting frame, and the guide rod section 430 forms a sliding guide fit with the annular structure. The guide rod segment 430 disposed on the valve stem assembly 400 has more advantages than being disposed on the valve flap tube 300. First, the operation process of the valve stem assembly 400 can conveniently verify whether the guide seat 140 is installed in the correct position; secondly, the guide seat 140 can be fixed after the valve stem assembly 400 is installed in place, so the guide seat 140 is naturally in the correct position; finally, in order to achieve a sealing effect, the valve flap tube 300 has the highest material requirements, and if the guide rod segment 430 is not disposed on the valve flap tube 300, the processing cost can be reduced to a certain extent.

[0041] The valve disc nut 500 is connected to the inner wall of the installation groove and presses down the protruding fixing ring 421. The valve disc nut 500 can be installed on the installation groove by a thread, a pin, etc., which is not limited to the specific method. The valve stem assembly 400 is connected to the valve disc tube 300 through the valve disc nut 500. The coil spring 600 is compressed and arranged between the valve disc nut 500 and the valve cover assembly 200. The elastic force provided by the coil spring 600 improves the sealing effect between the valve disc tube 300 and the valve seat 110.

[0042] In summary, the end of the valve flap tube 300 facing away from the valve seat 110 is concave to form a mounting groove, and the entire valve flap tube 300 constitutes a cup-shaped structure; the large column section 420 of the valve stem assembly 400 is arranged in the mounting groove and the outer peripheral wall is provided with a protruding fixing ring 421, the valve flap nut 500 is connected to the mounting groove and presses down the protruding fixing ring 421 to form a connection between the valve stem assembly 400 and the valve flap tube 300; the guide rod section 430 passes through the valve flap tube 300 and forms a position limitation with the guide seat 140; the valve stem assembly 400 can guide the installation process and can conveniently verify whether the guide seat 140 is installed in the correct position; the elastic force provided by the coil spring 600 improves the sealing effect between the valve flap tube 300 and the valve seat 110.

[0043] In one embodiment, the valve seat 110 and the guide seat 140 are connected by welding.

[0044] In this embodiment, the guide seat 140 is connected to the valve seat 110 by welding, thereby reducing the difficulty of processing the two. Specifically, after the two are matched, the connection is completed by welding.

[0045] Reference Figure 3 In one embodiment, a first filler 422 is disposed between a side of the protruding fixing ring 421 facing away from the valve flap nut 500 and the valve flap tube 300 .

[0046] In the present invention, the guide rod section 430 is arranged through the valve disc tube 300, which will cause certain leakage risks. Therefore, in this embodiment, a first filler 422 is arranged between the protruding fixing ring 421 and the valve disc tube 300, so as to form a sealing effect at this position, and the fluid under the valve seat 110 enters the valve disc tube 300 and is blocked by the first filler 422 at this position. The material of the first filler 422 at this position can be various organic or inorganic materials.

[0047] Reference Figure 3 In one embodiment, a second filler 423 is disposed between the protruding fixing ring 421 and the valve disc nut 500 .

[0048] In this embodiment, a second filler 423 is provided between the protruding fixing ring 421 and the end surface of the valve disc nut 500, thereby providing another layer of sealing effect, so that the sealing effect in the valve disc tube 300 is further improved. The material of the second filler 423 at this position can be various organic or inorganic materials.

[0049] In one embodiment, the first filler 422 between the protruding fixing ring 421 and the valve disc tube 300 , the second filler 423 between the protruding fixing ring 421 and the valve disc nut 500 , and the filler in the valve cover 210 are all made of flexible graphite.

[0050] In this embodiment, the preferred material of each filler is given, and flexible graphite has the advantages of low cost, good sealing effect and strong durability. The specific amount of filler is appropriately selected according to the actual situation.

[0051] In one embodiment, the small column segment 410 and the large column segment 420 are connected via a positioning pin.

[0052] In this embodiment, the connection between the small column segment 410 and the large column segment 420 is set as a positioning pin, which avoids the difficulty of processing the two as one piece and also reduces the difficulty of processing the connection structure between the two.

[0053] In one embodiment, the large column segment 420 and the guide rod segment 430 are threadedly connected.

[0054] In this embodiment, the connection between the large column segment 420 and the guide rod segment 430 is limited to a threaded connection, so that the position accuracy between the two is higher. At the same time, when the guide rod segment 430 fails during processing or use, it can be replaced more conveniently.

[0055] In one embodiment, the small column segment 410, the large column segment 420 and the guide rod segment 430 are an integrated structure.

[0056] In this embodiment, the small column segment 410, the large column segment 420 and the guide rod segment 430 are defined as an integral structure, thereby eliminating the connection at each position and the processing of the related connection structure. The above three can be processed as a whole by powder metallurgy or a machining center, among which powder metallurgy is preferred, which has the advantages of low cost and simple process.

[0057] Reference Figure 2 In one embodiment, the coil spring 600 is compressed and disposed between the valve disc nut 500 and the upper sealing seat 220 .

[0058] In this embodiment, the compression position of the coil spring 600 is set at the valve disc nut 500 and the upper sealing seat 220. When the coil spring 600 damages the relevant structure, the valve disc nut 500 or the upper sealing seat 220 can be replaced.

[0059] In one embodiment, the valve flap nut 500 and the valve flap tube 300 are connected by threaded connection, clamping or welding.

[0060] In this embodiment, several preferred arrangements between the valve flap nut 500 and the valve flap cylinder 300 are provided.

[0061] In summary, in the guided stop check valve provided by the utility model, the end of the valve disc tube 300 facing away from the valve seat 110 is concave to form a mounting groove, and the entire valve disc tube 300 constitutes a cup-shaped structure; the large column section 420 of the valve stem assembly 400 is arranged in the mounting groove and the outer peripheral wall is provided with a protruding fixing ring 421, the valve disc nut 500 is connected to the mounting groove and presses down the protruding fixing ring 421 to form a connection between the valve stem assembly 400 and the valve disc tube 300; the guide rod section 430 passes through the valve disc tube 300 and forms a position limitation with the guide seat 140; the valve stem assembly 400 can guide the installation process and can conveniently verify whether the guide seat 140 is installed in the correct position; the elastic force provided by the coil spring 600 improves the sealing effect between the valve disc tube 300 and the valve seat 110.

[0062] 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 guided stop check valve, characterized in that: include: A valve body (100) is provided with a working space inside, a valve seat (110) is provided in the middle of the working space in the height direction to separate the working space into a front chamber (120) and a rear chamber (130), and a guide seat (140) is hollowed out in the thickness direction on the valve seat (110); A valve cover assembly (200) comprises a valve cover (210) connected to the valve body (100) and arranged corresponding to the valve seat (110), a packing being fixed inside the valve cover (210), and an upper sealing seat (220) being connected to the inner end in the length direction of the valve cover (210); The valve disc tube (300) is matched with the valve seat (110), and one end of the valve disc tube (300) away from the valve seat (110) is concave to form a mounting groove. A valve stem assembly (400) comprises a small column section (410), a large column section (420) and a guide rod section (430) connected in sequence, wherein the outer peripheral wall of the large column section (420) is provided with a protruding fixing ring (421), the small column section (410) passes through the valve cover (210) and the upper sealing seat (220), the large column section (420) is arranged in the mounting groove, and the guide rod section (430) passes through the valve disc tube (300) to form a sliding fit with the guide seat (140); A valve disc nut (500) connected to the inner wall of the mounting groove to press down the protruding fixing ring (421); A coil spring (600) is compressed and arranged between the valve disc nut (500) and the valve cover assembly (200).

2. The guided stop check valve according to claim 1, characterized in that: The valve seat (110) and the guide seat (140) are connected by welding.

3. The guided stop check valve according to claim 1, characterized in that: A first filler (422) is arranged between a surface of the protruding fixing ring (421) facing away from the valve flap nut (500) and the valve flap cylinder (300).

4. The guided stop check valve according to claim 3, characterized in that: A second filler (423) is provided between the protruding fixing ring (421) and the valve disc nut (500).

5. The guided stop check valve according to claim 4, characterized in that: The first filler (422) between the protruding fixing ring (421) and the valve disc tube (300), the second filler (423) between the protruding fixing ring (421) and the valve disc nut (500), and the filler in the valve cover (210) are all made of flexible graphite.

6. The guided stop check valve according to claim 1, characterized in that: The small column section (410) and the large column section (420) are connected via a positioning pin.

7. The guided stop check valve according to claim 6, characterized in that: The large column section (420) and the guide rod section (430) are connected by threads.

8. The guided stop check valve according to claim 1, characterized in that: The small column segment (410), the large column segment (420) and the guide rod segment (430) are an integrated structure.

9. The guided stop check valve according to any one of claims 1 to 8, characterized in that: The coil spring (600) is compressed and arranged between the valve disc nut (500) and the upper sealing seat (220).

10. The guided stop check valve according to any one of claims 1 to 8, characterized in that: The connection between the valve flap nut (500) and the valve flap cylinder (300) is one of threaded connection, clamping or welding.

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