Pass-through pressure reducing valve

Abstract

A straight-through pressure reducing valve includes a valve body, a valve core, a medium inlet, a medium outlet, and a diaphragm assembly. The diaphragm assembly includes a diaphragm base, a diaphragm, and a diaphragm cover. The diaphragm base has a connecting channel and moves under the deformation of the diaphragm, causing the connecting channel to seal or release the seal with the valve core. An adjusting elastic element is fitted over the diaphragm base to adjust the compression seal strength between the connecting channel and the valve core. A sealing assembly is provided between the connecting portion of the valve body and the upper connecting channel. The sealing assembly includes a first sealing element and a second sealing element. The first sealing element has an extended portion that seals against the outer wall of the upper connecting channel. The second sealing element and a corresponding limiting structure respectively limit the first sealing element radially and axially.

Description

Technical Field

[0001] This utility model relates to a straight-through pressure reducing valve, belonging to the field of valves. Background Technology

[0002] A pressure reducing valve is a fluid control device that adjusts the inlet-side pressure to a predetermined outlet-side pressure by changing the effective flow area of ​​the fluid passage, and maintains the outlet-side pressure within a set range. Existing pressure reducing valves typically include a valve body, valve core, valve seat, diaphragm, and an elastic element for setting the pressure. The outlet-side pressure acts on the diaphragm, creating a feedback force. This feedback force balances the force applied by the elastic element, causing the valve core to move relative to the valve seat, thereby changing the medium flow rate and the outlet-side pressure.

[0003] In existing pressure-reducing valves, the valve core, diaphragm, and transmission structure are typically arranged in different directions. Diaphragm deformation needs to be transmitted to the valve core via the valve stem or other transmission components. This numerous transmission links easily lead to clearances, frictional resistance, and movement misalignment. Simultaneously, the moving connection between the diaphragm assembly and the valve body needs to balance sliding guidance and media sealing. During long-term reciprocating motion, the seal may experience radial displacement, axial movement, or localized deformation, thus affecting the stability of the pressure regulation response and sealing condition. Therefore, there is an urgent need to improve existing technology to address the difficulty in simultaneously achieving pressure regulation response and sealing stability in pressure-reducing valves, and the problem of axial or radial displacement of the sealing components. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a straight-through pressure reducing valve.

[0005] A straight-through pressure reducing valve includes a valve body, a valve core, a medium inlet, and a medium outlet. The valve core controls the opening and closing of the medium inlet and medium outlet via a diaphragm assembly. The diaphragm assembly includes a diaphragm base, a diaphragm, and a diaphragm cover. The diaphragm base has a connecting channel, which controls the opening and closing of the medium inlet and medium outlet via the valve core. An adjusting elastic element is fitted over the diaphragm base, and the adjusting elastic element controls the compression sealing strength between the valve core and the connecting channel by adjusting the elastic force.

[0006] Furthermore, the diaphragm base is slidably installed in the valve body, and a sliding groove is provided on the medium inlet. One end of the diaphragm base extends into the sliding groove and is slidably connected to the medium inlet, while the other end abuts against the valve core to form a sealed connection. The diaphragm base slides in the sliding groove by the deformation of the diaphragm to control the sealing or unsealing state with the valve core.

[0007] Furthermore, the connection channel includes an upper connection channel and a lower connection channel. The adjusting elastic element is sleeved outside the lower connection channel, and the upper connection channel passes through the diaphragm cover and abuts against the valve core to form a sealed connection.

[0008] Preferably, the adjusting elastic element is a spring or an elastic sleeve.

[0009] Furthermore, the diaphragm cover is provided with a connecting groove, and the valve body is provided with a connecting part extending into the connecting groove and fitting into the upper connecting channel. A sealing component is provided in the connecting part, and the connecting part forms a sealed connection with the upper connecting channel through the sealing component.

[0010] Furthermore, the sealing assembly includes a mounting groove disposed inside the connecting portion, wherein a first sealing element and a second sealing element that cooperates with and limits the first sealing element are provided in the mounting groove, and an extension portion is provided at the bottom of the first sealing element, wherein the extension portion extends into the gap between the connecting portion and the upper connecting channel to form a sealed connection with the outer wall of the upper connecting channel.

[0011] Furthermore, the second seal is fitted over the first seal, so that the first seal is radially positioned within the mounting groove.

[0012] Furthermore, the top of the second sealing member is provided with a first limiting block extending toward the upper connecting channel, and a second limiting block and a third limiting block are provided outside the upper connecting channel. A limiting groove is formed between the second limiting block and the third limiting block. The first limiting block is engaged with the limiting groove, and the second limiting block is limited at the upper end of the first sealing member, so that the first sealing member is limited in the axial direction and positioned in the mounting groove.

[0013] Furthermore, the third limiting block is positioned above the first limiting block, and a gap is provided between the upper end of the third limiting block and the mounting groove.

[0014] The beneficial effects of this invention are as follows: It reduces the intermediate transmission links between the diaphragm and the flow control components, allowing the displacement generated by the diaphragm to be directly converted into a change in the sealing state between the connecting channel and the valve core. The adjusting elastic element, sleeved outside the diaphragm base, allows for setting the clamping force between the connecting channel and the valve core, balancing the force generated by the outlet pressure acting on the diaphragm with the elastic force of the adjusting elastic element. The connecting part, sealing assembly, and multi-stage limiting structure jointly seal and limit the movable connection position, preventing the first sealing element from radially shifting or axially moving during the reciprocating motion of the diaphragm base, and allowing related components to undergo adaptive displacement within a predetermined range, thereby maintaining the sealing state of the medium passage and the continuity of the pressure regulating action. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a top view of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is an enlarged view of the details of this utility model; In the diagram, 1 is the valve body; 11 is the medium inlet; 111 is the sliding groove; 12 is the medium outlet; 13 is the connecting part; 131 is the mounting groove; 14 is the pressure sensing chamber; 15 is the adjusting chamber; 2 is the valve core; 3 is the diaphragm assembly; 31 is the diaphragm base; 311 is the connecting channel; 3111 is the upper connecting channel; 3112 is the lower connecting channel; 312 is the second limiting block; 313 is the third limiting block; 314 is the limiting groove; 32 is the diaphragm; 33 is the diaphragm cover; 331 is the connecting groove; 4 is the adjusting elastic element; 5 is the sealing assembly; 51 is the first sealing element; 511 is the extension part; 52 is the second sealing element; 521 is the first limiting block. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely 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.

[0020] like Figure 1-3The diagram illustrates an embodiment of a direct-flow pressure reducing valve according to this invention. It includes a valve body 1, a valve core 2, a medium inlet 11, and a medium outlet 12. The valve core 2 controls the opening and closing of the medium inlet 11 and the medium outlet 12 via a diaphragm assembly 3. The diaphragm assembly 3 includes a diaphragm base 31, a diaphragm 32, and a diaphragm cover 33. The diaphragm base 31 has a connecting channel 311, which controls the opening and closing of the medium inlet 11 and the medium outlet 12 via the valve core 2. An adjusting elastic element 4 is fitted over the diaphragm base 31, and the adjusting elastic element 4 controls the compression and sealing strength between the valve core 2 and the connecting channel 311 by adjusting the elastic force.

[0021] The adjusting elastic element 4 is disposed in the adjusting cavity 15. One end of it acts on the diaphragm base 31, and the other end acts on the valve body 1 or the support structure connected to the valve body 1, thereby applying an elastic force to the diaphragm base 31 in the opposite direction to the outlet side pressure.

[0022] When the outlet pressure changes, the balance between the pressure force acting on the diaphragm 32 and the elastic force of the adjusting elastic element 4 changes, causing the diaphragm 32 to deform and move the diaphragm base 31. When the diaphragm base 31 moves towards the valve core 2, the clamping force between the connecting channel 311 and the valve core 2 increases, and the effective flow area of ​​the medium decreases; when the diaphragm base 31 moves away from the valve core 2, the clamping state between the connecting channel 311 and the valve core 2 is released or weakened, and the effective flow area of ​​the medium increases. By adjusting the preload of the adjusting elastic element 4 or replacing it with an adjusting elastic element 4 with a different elastic force, the outlet pressure corresponding to the diaphragm assembly 3 reaching equilibrium can be changed.

[0023] Optionally, in some embodiments, the diaphragm base 31 is slidably mounted inside the valve body 1, and a sliding groove 111 is provided on the medium inlet 11. One end of the diaphragm base 31 extends into the sliding groove 111 and is slidably connected to the medium inlet 11, while the other end of the diaphragm base 31 abuts against the valve core 2 to form a sealed connection. The diaphragm base 31 can move along the sliding groove 111 when the diaphragm 32 deforms, thereby controlling the formation or release of a sealed state between the connection channel 311 and the valve core 2.

[0024] The guiding fit between the sliding groove 111 and the diaphragm base 31 enables the deformation motion of the diaphragm 32 to be converted into a relatively stable axial motion of the diaphragm base 31, reducing the possibility of lateral displacement of the diaphragm base 31 when subjected to medium pressure and the force of the regulating elastic element 4. The contact position between the connecting channel 311 and the valve core 2 can therefore maintain a relatively stable correspondence, avoiding localized compression or unilateral gaps due to misalignment of the contact position. One end of the diaphragm base 31 is guided by the sliding groove 111, while the other end directly participates in the sealing fit of the valve core 2, ensuring that the guiding position and the sealing position are set along the same moving part, thus shortening the force transmission path.

[0025] Optionally, in some embodiments, the connection channel 311 includes an upper connection channel 3111 and a lower connection channel 3112. The adjusting elastic element 4 is sleeved outside the lower connection channel 3112, and the upper connection channel 3111 passes through the diaphragm cover 33 and abuts against the valve core 2 to form a sealed connection.

[0026] In this embodiment, the upper connecting channel 3111 and the lower connecting channel 3112 can be integrally formed with the diaphragm base 31, or they can be manufactured separately and then connected by threads, snap-fit, welding, press-fitting or other fixing methods.

[0027] The connecting channel 311 is divided into an upper connecting channel 3111 and a lower connecting channel 3112, so that the elastic force is concentrated on the diaphragm base 31. The upper connecting channel 3111 passes through the diaphragm cover 33 and directly engages with the valve core 2, allowing the axial displacement of the diaphragm base 31 to be transmitted to the throttling position. This also facilitates the installation of an independent movable sealing structure between the upper connecting channel 3111 and the diaphragm cover 33. During actual maintenance, the upper connecting channel 3111, the sealing assembly 5, or the adjusting elastic element 4 can be inspected according to the wear location; it is not necessary to replace the entire valve body 1 simultaneously.

[0028] Optionally, in some embodiments, the adjusting elastic element 4 is a spring or an elastic sleeve.

[0029] When the adjusting elastic element 4 is a spring, a helical compression spring can be used, sleeved on the outside of the lower connecting channel 3112. One end of the helical compression spring abuts against the diaphragm base 31, and the other end abuts against the support surface or pressure regulating structure inside the valve body 1. By changing the pre-compression state of the helical compression spring, the medium pressure corresponding to the force balance between the diaphragm base 31 and the valve core 2 can be changed. When the adjusting elastic element 4 is an elastic sleeve, the elastic sleeve can be a cylindrical elastic component continuously arranged circumferentially along the lower connecting channel 3112, with its two axial ends in contact with the diaphragm base 31 and the support structure, respectively. The elastic sleeve generates a restoring force after being axially compressed.

[0030] Optionally, in some embodiments, the diaphragm cover 33 is provided with a connecting groove 331, and the valve body 1 is provided with a connecting part 13 extending into the connecting groove 331 and fitting into the upper connecting channel 3111. The connecting part 13 is provided with a sealing component 5, and the connecting part 13 forms a sealed connection with the upper connecting channel 3111 through the sealing component 5.

[0031] After the connecting groove 331 and the connecting part 13 form a mutually nested structure, the diaphragm cover 33, valve body 1, and upper connecting channel 3111 form multiple layers of radial constraints at the assembly position, making it less likely for the upper connecting channel 3111 to deviate from the sealing center of the valve core 2 during reciprocating movement. The sealing assembly 5 is installed inside the connecting part 13, which can concentrate the movable sealing position in a relatively stable guide area, making it less likely for the medium to enter the outside of the diaphragm cover 33 or the regulating cavity 15 along the gap between the upper connecting channel 3111 and the connecting part 13. The connecting groove 331 can also provide a receiving space for the connecting part 13, allowing the connecting part 13 to be arranged close to the diaphragm 32 and valve core 2 without significantly increasing the axial length of the valve body 1. During assembly, the connecting groove 331 guides the position of the connecting part 13, which helps to maintain the predetermined relative position of the diaphragm cover 33 and the valve body 1, and to make the sealing assembly 5 and the upper connecting channel 3111 form uniform contact, reducing the possibility of local over-compression of the seal due to installation misalignment.

[0032] Optionally, in some embodiments, the sealing assembly 5 includes a mounting groove 131 disposed inside the connecting portion 13. The mounting groove 131 contains a first sealing member 51 and a second sealing member 52 that cooperates with and limits the first sealing member 51. The bottom of the first sealing member 51 has an extension portion 511 that extends into the gap between the connecting portion 13 and the upper connecting channel 3111, and forms a sealing connection with the outer wall of the upper connecting channel 3111.

[0033] The first seal 51, through its extended portion 511, forms a longer axial sealing contact area with the upper connecting channel 3111. Compared to relying solely on a single annular contact edge for sealing, this reduces the possibility of the sealing contact area completely disengaging when the upper connecting channel 3111 moves axially or slightly shifts. The extended portion 511 extends into the gap between the connecting portion 13 and the upper connecting channel 3111, also preventing the medium from directly entering the mounting groove 131, thus reducing the lifting effect of the medium pressure on the body of the first seal 51. The second seal 52 engages and limits the first seal 51, ensuring that the first seal 51 remains within the mounting groove 131 even under medium pressure and sliding friction. In actual assembly, the first seal 51 can be pressed into the mounting groove 131 with the extended portion 511 facing a predetermined direction before the second seal 52 is inserted to form a support, thereby preventing the first seal 51 from flipping or curling during insertion into the upper connecting channel 3111.

[0034] Optionally, in some embodiments, the second seal 52 is sleeved outside the first seal 51, so that the first seal 51 is radially limited and disposed within the mounting groove 131.

[0035] After the second seal 52 forms a radial constraint outside the first seal 51, the first seal 51 is less likely to be squeezed into the outer gap of the mounting groove 131 when subjected to medium pressure, and is also less likely to gradually deviate from the sealing center due to the reciprocating friction of the upper connecting channel 3111. The radial deformation range of the first seal 51 is controlled, and its inner circumferential sealing surface can continuously face the upper connecting channel 3111, thereby maintaining a relatively uniform circumferential contact pressure.

[0036] Optionally, in some embodiments, the top of the second sealing member 52 is provided with a first limiting block 521 extending toward the upper connecting channel 3111, and a second limiting block 312 and a third limiting block 313 are provided outside the upper connecting channel 3111. A limiting groove 314 is formed between the second limiting block 312 and the third limiting block 313, and the first limiting block 521 is engaged with the limiting groove 314. The second limiting block 312 is positioned at the upper end of the first sealing member 51, so that the first sealing member 51 is axially positioned within the mounting groove 131.

[0037] The second limiting block 312 is located at the upper end of the first sealing member 51, and its side facing the first sealing member 51 forms a limiting surface. When the first sealing member 51 is subjected to medium pressure or friction generated by the movement of the upper connecting channel 3111, the second limiting block 312 can prevent the first sealing member 51 from disengaging from the mounting groove 131 along the axial direction of the upper connecting channel 3111. The third limiting block 313 is located on the other side of the first limiting block 521 and is used to limit the range of movement of the first limiting block 521 relative to the upper connecting channel 3111.

[0038] Optionally, in some embodiments, the third limiting block 313 is positioned above the first limiting block 521, and a gap is provided between the upper end of the third limiting block 313 and the mounting groove 131.

[0039] A gap is provided between the third limiting block 313 and the mounting groove 131 to prevent the normal reciprocating motion of the upper connecting channel 3111 from being directly blocked by the rigidity of the mounting groove 131, allowing the diaphragm base 31 to be continuously adjusted according to changes in outlet pressure. This gap also provides compensation space for the elastic deformation of the first seal 51 and the second seal 52 after being compressed, preventing the sealing assembly 5 from being over-compressed due to dimensional deviations of the components or thermal expansion and contraction. The third limiting block 313 is still located above the first limiting block 521, so it can form a termination limit when the first limiting block 521 undergoes a large axial displacement, preventing the first limiting block 521 from going out of the limiting groove 314. Thus, the sealing assembly 5 can both make small adaptive floating ranges during normal operation and be structurally restricted when it exceeds the predetermined range of movement, thereby taking into account both the displacement capacity required for the active seal and the stability required for assembly limiting.

[0040] 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.

[0041] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A straight-through pressure reducing valve, characterized in that: The device includes a valve body, a valve core, a medium inlet, and a medium outlet. The valve core controls the opening and closing of the medium inlet and medium outlet via a diaphragm assembly. The diaphragm assembly includes a diaphragm base, a diaphragm, and a diaphragm cover. The diaphragm base has a connecting channel, which controls the opening and closing of the medium inlet and medium outlet via the valve core. An adjusting elastic element is fitted over the diaphragm base, and the adjusting elastic element controls the compression and sealing strength between the valve core and the connecting channel by adjusting the elastic force.

2. The straight-through pressure reducing valve as described in claim 1, characterized in that: The diaphragm base is slidably installed in the valve body. A sliding groove is provided on the medium inlet. One end of the diaphragm base extends into the sliding groove and is slidably connected to the medium inlet. The other end abuts against the valve core to form a sealed connection. The diaphragm base slides in the sliding groove by the deformation of the diaphragm to control the sealing or unsealing state with the valve core.

3. The straight-through pressure reducing valve as described in claim 1, characterized in that: The connection channel includes an upper connection channel and a lower connection channel. The adjusting elastic element is sleeved outside the lower connection channel, and the upper connection channel passes through the diaphragm cover and abuts against the valve core to form a sealed connection.

4. The straight-through pressure reducing valve as described in claim 1 or 3, characterized in that: The adjusting elastic element is a spring or an elastic sleeve.

5. The straight-through pressure reducing valve as described in claim 1, characterized in that: The diaphragm cover is provided with a connecting groove, and the valve body is provided with a connecting part that extends into the connecting groove and is sleeved with the upper connecting channel. The connecting part is provided with a sealing component, and the connecting part forms a sealed connection with the upper connecting channel through the sealing component.

6. The straight-through pressure reducing valve as described in claim 5, characterized in that: The sealing assembly includes a mounting groove located inside the connecting portion. The mounting groove contains a first sealing element and a second sealing element that cooperates with and limits the first sealing element. The bottom of the first sealing element has an extension portion that extends into the gap between the connecting portion and the upper connecting channel to form a sealed connection with the outer wall of the upper connecting channel.

7. The straight-through pressure reducing valve as described in claim 6, characterized in that: The second sealing element is sleeved outside the first sealing element so that the first sealing element is radially limited and positioned within the mounting groove.

8. The straight-through pressure reducing valve as described in claim 7, characterized in that: The top of the second sealing element is provided with a first limiting block extending toward the upper connecting channel. A second limiting block and a third limiting block are provided outside the upper connecting channel. A limiting groove is formed between the second limiting block and the third limiting block. The first limiting block is engaged in the limiting groove. The second limiting block is limited at the upper end of the first sealing element, so that the first sealing element is limited in the axial direction and positioned in the mounting groove.

9. The straight-through pressure reducing valve as described in claim 8, characterized in that: The third limiting block is positioned above the first limiting block, and a gap is provided between the upper end of the third limiting block and the mounting groove.

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