Pressure equalizing valve

Abstract

The utility model provides a kind of pressure balance valve, including valve body, the upper end of the valve body is equipped with first opening, the lower end of valve body is equipped with second opening;The outside of valve body upper end is equipped with the first sealing plate of carrying out elastic sealing to first opening, the inside of the lower end of valve body is equipped with the second sealing plate of carrying out elastic sealing to second opening;First sealing plate and second sealing plate between being equipped with the guide column of connecting both;Valve body's lateral wall is equipped with communicating port.Both first sealing plate and second sealing plate can be stably stayed in the position of sealing cooperation with valve body under the action of spring.Both first sealing plate and second sealing plate move up and down share a guide structure, so that first sealing plate and second sealing plate move up and down more stably. The guide structure is composed of guide column and guide pipe.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a pressure balancing valve. Background Technology

[0002] A pressure balancing valve is a valve used to control the balance of internal pressure.

[0003] In the prior art, a pressure balancing valve is disclosed in patent publication number CN 223178244 U, and references are made to... Figure 1 As shown.

[0004] The aforementioned pressure balancing valve includes a valve body with a first valve port and a second valve port correspondingly located at the top and bottom. A first valve plate and a second valve plate are respectively located at the first and second valve ports. When the external pressure is higher than the internal pressure, the first valve plate closes the first valve port under the action of the external high pressure, and the second valve plate is lifted and suspended under the same pressure, opening the second valve port. When the internal pressure is higher than the external pressure, the second valve plate closes the second valve port under the action of the internal high pressure, and the first valve plate is lifted and suspended under the same pressure, opening the first valve port.

[0005] While the aforementioned existing technology can achieve basic pressure balance control, its structural design still has flaws. Specifically, the first and second valve plates in this patented technology lack necessary limiting constraints and guiding positioning structures, causing the valve plates to be unable to move stably along a fixed trajectory when opening or closing under pressure difference. In actual working conditions, this structural defect can easily lead to several problems: First, the valve plates are prone to skewness or jamming during movement, resulting in poor valve port sealing and leakage, or insufficient opening angle affecting pressure regulation efficiency; second, the contact position between the valve plate and the valve port is unstable, which will cause uneven wear of the sealing surface over long-term use, significantly shortening the valve's service life; third, in systems with frequent pressure fluctuations, the valve plates are prone to reciprocating oscillations, which not only generate operating noise but also lead to a decrease in pressure control accuracy. Utility Model Content

[0006] In view of the problems pointed out in the background art, this utility model proposes a pressure balancing valve to solve the above-mentioned technical problems.

[0007] The technical solution of this utility model is implemented as follows: A pressure balancing valve includes a valve body, wherein the upper end of the valve body has a first opening and the lower end of the valve body has a second opening; a first sealing plate is provided on the outer side of the upper end of the valve body to elastically seal the first opening, and a second sealing plate is provided on the inner side of the lower end of the valve body to elastically seal the second opening; a guide post is provided between the first sealing plate and the second sealing plate to connect the two; and a communication port is provided on the side wall of the valve body.

[0008] The present invention is further configured such that a guide post is provided on the upper side of the second sealing plate, and a guide tube is provided on the lower side of the first sealing plate, which extends into the valve body through the first opening, and the guide post extends into the guide tube and forms a sliding fit with the guide tube.

[0009] The present invention is further configured such that the second sealing plate is sealed to the inner side of the lower side wall of the valve body, and a second spring is provided inside the valve body, the lower end of the second spring abutting against the second sealing plate and the upper end of the second spring abutting against the upper side wall of the valve body; the first sealing plate is sealed to the outer side of the upper side wall of the valve body, and an annular limiting ring is connected to the lower end of the guide tube, and a first spring is sleeved on the guide tube, the upper end of the first spring abutting against the upper side wall of the valve body and the lower end of the first spring abutting against the limiting ring.

[0010] The present invention is further configured such that the valve body is tubular, with an upper sealing plate sealed to the inner side of the upper end of the valve body and a first opening disposed on the upper sealing plate; and a lower sealing plate sealed to the inner side of the lower end of the valve body and a second opening disposed on the lower sealing plate.

[0011] The present invention is further configured such that the valve body is composed of an upper valve body and a lower valve body, the upper valve body and the lower valve body are sealed and fixedly connected by a flange structure, and the communication port is provided on the upper valve body or the lower valve body.

[0012] The present invention is further provided that the outer surface of the guide post is provided with a groove along the vertical direction.

[0013] The present invention is further configured such that the edge of the first sealing plate is connected to an annular cover, and the cover is slidably sleeved on the outer side wall of the upper end of the valve body.

[0014] The present invention is further provided that the lower end of the valve body is provided with a filter structure.

[0015] The present invention is further configured such that the filter structure includes a filter mesh layer and a sponge layer.

[0016] The present invention is further configured such that the second spring is a cone shape with a larger upper end and a smaller lower end, and the lower end of the second spring is sleeved on the guide post.

[0017] By adopting the above technical solution, the beneficial effects of this utility model are as follows: 1. Both the first and second sealing plates can be stably held in the position of sealing with the valve body under the action of the spring.

[0018] 2. The first and second sealing plates share a common guide structure for their vertical movement, making their vertical movement more stable. This guide structure consists of guide posts and guide tubes. Attached Figure Description

[0019] 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, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the existing technology.

[0021] Figure 2 This is a schematic diagram of the structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0023] Figure 4 This is a cross-sectional view of the present invention.

[0024] The following are the labels in the attached diagram: Valve body 1, First opening 2, Second opening 3, First sealing plate 4, Second sealing plate 5, Guide post 6, Connecting port 7, Guide tube 8, Spring 2 9, Restriction ring 10, Spring 11, Upper sealing plate 12, Lower sealing plate 13, Upper valve body 14, Lower valve body 15, Groove 16, Cover 17, Filter structure 18. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] For reference as follows Figures 1-4 The present invention will be described as follows: Example: A pressure balancing valve includes a valve body 1, which is tubular. An upper sealing plate 12 is sealed to the inner side of the upper end of the valve body 1, and a lower sealing plate 13 is sealed to the inner side of the lower end of the valve body 1. The three together form a sealed pressure regulating chamber, providing the necessary space for pressure balancing operation.

[0027] The upper sealing plate 12 and the lower sealing plate 13 are fixed to the inner sides of both ends of the valve body 1 by a sealing connection method (such as welding). The connection part must meet the sealing requirements to prevent leakage of pressure medium and ensure the sealing of the pressure regulating chamber.

[0028] The upper sealing plate 12 has a first opening 2 in the center (the inner diameter of the first opening 2 is slightly larger than the outer diameter of the guide tube 8 to ensure that the guide tube 8 can pass through smoothly and the gap is controllable), and the lower sealing plate 13 has a second opening 3 in the center.

[0029] A first sealing plate 4 is provided on the outer side of the upper end of the valve body 1 to elastically seal the first opening 2. The first sealing plate 4 is in sealing fit with the outer side of the upper side wall of the valve body 1. Both sealing plates adopt an elastic sealing design, and the opening is sealed by tightly fitting with the valve body wall.

[0030] The first sealing plate 4 (located on the outer side of the upper end of the valve body) and the second sealing plate 5 (located on the inner side of the lower end of the valve body) are used to achieve opening sealing and pressure sensing. They are the actuators of the pressure balancing valve.

[0031] A second sealing plate 5 is provided on the inner side of the lower end of the valve body 1 to elastically seal the second opening 3; the second sealing plate 5 is in sealing fit with the inner side of the lower side wall of the valve body 1. A second spring 9 is provided inside the valve body 1 (to provide preload force for the second sealing plate 5), the lower end of the second spring 9 abuts against the second sealing plate 5, and the upper end of the second spring 9 abuts against the upper side wall of the valve body 1. The second spring 9 applies a downward elastic force to the second sealing plate 5, so that the second sealing plate 5 elastically seals the second opening 3.

[0032] The lower side of the first sealing plate 4 forms a surface contact seal with the outer side of the upper sidewall of the valve body 1. To improve the sealing effect, a sealing gasket can be provided on the end face of the sealing plate that contacts the valve body. The function of the first sealing plate 4 is to open and close the first opening 2 through its own displacement, thereby completing the pressure release from inside the valve body to the outside.

[0033] The lower side of the second sealing plate 5 forms a sealing fit with the inner side of the lower side wall of the valve body 1. The sealing surface must cover the second opening 3 to ensure effective sealing of the second opening 3. Its function is to control the opening and closing of the second opening 3 through displacement, so as to realize the external pressure supplement to the inside of the valve body.

[0034] The lower side of the first sealing plate 4 is provided with a guide tube 8 that passes through the first opening 2 and extends into the valve body 1. The lower end of the guide tube 8 is connected to an annular limiting ring 10. A spring 11 (providing preload to the first sealing plate 4) is sleeved on the guide tube 8. The upper end of the spring 11 abuts against the upper side wall of the valve body 1, and the lower end of the spring 11 abuts against the limiting ring 10. Since the limiting ring 10 is rigidly connected to the guide tube 8, and the guide tube 8 is fixed to the first sealing plate 4, the preload of the spring 11 is transmitted to the first sealing plate 4 through the limiting ring 10 and the guide tube 8, forming a downward pulling force, so that the first sealing plate 4 is always in close contact with the outer surface of the upper side wall of the valve body 1, forming an elastic seal against the first opening 2.

[0035] A guide post 6 (with its axis coinciding with the guide tube 8) is vertically provided on the upper side of the second sealing plate 5. The guide post 6 extends into the guide tube 8 and forms a sliding fit with the guide tube 8. When the first sealing plate 4 and the second sealing plate 5 move up and down, the guide post 6 and the guide tube 8 form a guiding structure, thus enabling the first sealing plate 4 and the second sealing plate 5 to move up and down stably.

[0036] Spring 29 is a cone shape, wider at the top and narrower at the bottom, with its lower end fitted onto guide post 6. The advantages of its cone-shaped design are twofold: firstly, it allows for a larger range of elastic force variation within the limited space of the valve body; secondly, the lower end fitted onto guide post 6 enables radial positioning, preventing spring 29 from shifting during compression or extension.

[0037] A communication port 7 is provided on the side wall of the valve body 1. This port is used to connect the inside of the valve body with the space where pressure balancing is required.

[0038] When the external pressure is higher than the internal pressure of the valve body 1, the first sealing plate 4 closes the first opening 2 under the action of the external high pressure, and the second sealing plate 5 moves upward against the elastic force of the second spring 9 under the drive of the external high pressure, and the second opening 3 opens.

[0039] When the internal pressure of valve body 1 is higher than the external pressure, the second sealing plate 5 closes the second opening 3 under the action of internal high pressure, and the first sealing plate 4 moves upward against the pull chain of spring 11 under the drive of internal high pressure, opening the first opening 2.

[0040] Both the first sealing plate 4 and the second sealing plate 5 are provided with continuous preload by corresponding springs (spring 11 and spring 9), ensuring that the sealing plates maintain a sealed fit with the valve body wall (or sealing plate) even when there is no pressure difference or the pressure difference is insufficient. This effectively avoids sealing failure caused by the weight of the sealing components or vibration. Simultaneously, the elastic characteristics of the springs give the sealing plates a certain degree of self-compensation capability: when a small gap appears on the sealing surface due to wear, the preload of the springs can push the sealing plates to move slightly, filling the gap, maintaining the sealing effect, and extending the service life of the valve.

[0041] A coordinated guiding system consisting of guide post 6 and guide tube 8 is adopted to provide guiding support for the vertical movement of the first sealing plate 4 and the second sealing plate 5. The advantages of this design are: first, it simplifies the structure, reduces the number of guiding components, and lowers the assembly difficulty and manufacturing cost; second, it ensures that the movement axes of the two sealing plates are completely coincident, avoiding axis offset caused by independent guidance, making their movements more coordinated, especially under conditions of frequent pressure fluctuations and frequent opening and closing of the sealing plates, which can effectively reduce uneven wear of the sealing surfaces.

[0042] The outer side of the guide post 6 is provided with a groove 16 along the vertical direction. When the guide post 6 moves into the guide tube 8, the sealed gas in the guide tube 8 can be quickly discharged through the channel formed by the groove 16, so as to avoid the back pressure caused by gas compression from hindering the smooth movement of the guide post 6. At the same time, it prevents the guide post 6 from being delayed in resetting due to gas expansion, and ensures the response accuracy of the sealing plate.

[0043] The valve body 1 consists of an upper valve body 14 and a lower valve body 15, which are sealed and fixedly connected by a flange structure. The communication port 7 is located on the upper valve body 14. Matching flanges are machined at the lower end of the upper valve body 14 and the upper end of the lower valve body 15, respectively. Evenly distributed bolt holes are opened on the flanges, and axial fixation is achieved by bolt tightening. Sealing gaskets (such as asbestos gaskets or spiral wound gaskets) are installed between the flange sealing surfaces to ensure the sealing performance of the connection and prevent leakage of pressure medium. The core advantage of the segmented design is that it facilitates valve assembly, maintenance, and component replacement. When components such as springs and sealing plates inside the valve body fail, the upper and lower valve bodies can be separated by removing the flange bolts without disassembling the entire valve, greatly improving maintenance convenience.

[0044] An annular cover 17 is integrally connected to the edge of the first sealing plate 4. The inner diameter of the cover 17 is slightly larger than the outer diameter of the outer wall of the upper end of the valve body 1. The cover 17 is slidably fitted onto the outer wall of the upper end of the valve body 1. The function of the cover 17 is to protect the sealing mating surface, effectively preventing external dust, oil, moisture and debris from directly contacting the sealing surface, avoiding contamination, corrosion or scratches on the sealing surface, and reducing the impact of external factors such as vibration and impact on the sealing mating state, thus extending the service life of the sealing structure.

[0045] A filter structure 18 is provided at the lower end of the valve body 1. The filter structure 18 includes a filter screen layer and a sponge layer. This structure is fixed below the lower sealing plate 13 and completely covers the inlet end of the second opening 3. The filter structure 18 adopts a composite layer design, consisting of an upper filter screen layer and a lower sponge layer. On the one hand, it can perform secondary filtration of fine impurities intercepted by the filter screen layer; on the other hand, it has a certain adsorption capacity, which can adsorb water vapor and oil stains in the air, further improving the cleanliness of the intake air.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure balancing valve, comprising a valve body, characterized in that: The valve body has a first opening at its upper end and a second opening at its lower end; a first sealing plate that provides elastic sealing to the first opening is provided on the outer side of the upper end of the valve body, and a second sealing plate that provides elastic sealing to the second opening is provided on the inner side of the lower end of the valve body; a guide post that connects the first sealing plate and the second sealing plate is provided between the two; and a communication port is provided on the side wall of the valve body.

2. The pressure balancing valve according to claim 1, characterized in that: The second sealing plate has a guide post on its upper side and a guide tube that extends into the valve body through the first opening on its lower side. The guide post extends into the guide tube and forms a sliding fit with the guide tube.

3. A pressure balancing valve according to claim 2, characterized in that: The second sealing plate is sealed to the inner side of the lower side wall of the valve body. A second spring is provided inside the valve body. The lower end of the second spring abuts against the second sealing plate, and the upper end of the second spring abuts against the upper side wall of the valve body. The first sealing plate is sealed to the outer side of the upper side wall of the valve body. An annular limiting ring is connected to the lower end of the guide tube. A first spring is sleeved on the guide tube. The upper end of the first spring abuts against the upper side wall of the valve body, and the lower end of the first spring abuts against the limiting ring.

4. A pressure balancing valve according to claim 3, characterized in that: The valve body is tubular, with an upper sealing plate sealed to the inner side of the upper end of the valve body and a first opening located on the upper sealing plate; a lower sealing plate is sealed to the inner side of the lower end of the valve body and a second opening is located on the lower sealing plate.

5. A pressure balancing valve according to claim 4, characterized in that: The valve body consists of an upper valve body and a lower valve body, which are sealed and fixedly connected by a flange structure, and the communication port is located on the upper valve body or the lower valve body.

6. A pressure balancing valve according to claim 2, characterized in that: The guide post has a groove on its outer side along the vertical direction.

7. A pressure balancing valve according to claim 3, characterized in that: The edge of the first sealing plate is connected to an annular cover, which is slidably fitted onto the outer wall of the upper end of the valve body.

8. A pressure balancing valve according to claim 1, characterized in that: The lower end of the valve body is equipped with a filter structure.

9. A pressure balancing valve according to claim 8, characterized in that: The filter structure includes a filter mesh layer and a sponge layer.

10. A pressure balancing valve according to claim 3, characterized in that: The second spring is a cone shape, wider at the top and narrower at the bottom, with its lower end fitted onto the guide post.

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