Straight-through type adjusting unloading valve

Abstract

The utility model discloses a straight-through type adjusting unloading valve, which belongs to the technical field of unloading valves, and comprises an upper valve body, a valve rod, a spiral spring and a lower valve body, and the upper valve body, the lower valve body and the valve rod form a straight-through type structure; the valve rod is movably arranged in a cavity formed by assembling the upper valve body and the lower valve body, the valve rod comprises a first valve rod and a second valve rod, the second valve body is arranged in the lower valve body, the end of the second valve body abuts against a sealing seat arranged in the lower valve body in a sealed mode, the first valve rod is assembled on the second valve rod, and the second valve rod is assembled on the lower valve body. The end of the spiral spring is inserted into a through groove formed in the upper valve body, the first valve rod and the second valve rod are sleeved with the spiral spring, one end of the spiral spring abuts against an annular boss arranged on the outer wall of the second valve rod, and the other end of the spiral spring abuts against a limiting boss arranged on the inner wall of the upper valve body. According to the utility model, the unloading pressure can be accurately controlled and quickly adjusted, and the stability and the reliability of the system are obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of unloading valves, in particular to a straight-through regulating unloading valve. Background Art

[0002] In existing hydraulic and pneumatic systems, especially in hydraulic and pneumatic systems, unloading valves are an indispensable and important component. They are devices that perform pressure regulation through unloading valves. They are mainly used to release the pressure on the high-pressure side to the low-pressure side when the system is not working, so as to protect the various components of the system from damage by high pressure. However, traditional unloading valves have problems in pressure regulation, such as complex operation, low adjustment accuracy, and difficulty in rapid response, which reduces the stability and reliability of the system during operation. Especially in some application scenarios with high requirements for pressure control, such as high-precision machine tools and aerospace equipment, traditional unloading valves are often difficult to meet the needs. Utility Model Content

[0003] The main purpose of the utility model is to solve the above-mentioned technical problems to a certain extent, and to propose a straight-through regulating unloading valve, which can achieve accurate control and rapid adjustment of the unloading pressure, and significantly improve the stability and reliability of the system.

[0004] The above-mentioned problem to be solved by the present invention is achieved through the following technical solutions:

[0005] A straight-through regulating unloading valve is proposed, comprising an upper valve body, a valve stem, a coil spring and a lower valve body. The inlet and outlet openings at both ends of the upper and lower valve bodies and the unloading passage of the valve stem are connected to form a straight-through structure.

[0006] The valve stem is movably arranged in a cavity formed by the assembly of the upper valve body and the lower valve body. The valve stem includes a first valve stem and a second valve stem, wherein the second valve body is placed inside the lower valve body, and the end of the second valve stem is tightly sealed against a sealing seat provided inside the lower valve body. The first valve stem is assembled on the second valve stem, and the end of the first valve stem is inserted into a through groove provided in the upper valve body.

[0007] The coil spring is sleeved on the outside of the first valve stem and the second valve stem, one end of which is against the annular boss provided on the outer wall of the second valve stem, and the other end is against the limiting boss provided on the inner wall of the upper valve body, so that the second valve stem is pressed tightly against the sealing seat under the action of the coil spring.

[0008] In some embodiments, a first sealing ring is provided between the second valve stem and the sealing seat, and a compression screw sleeve and the second valve stem are provided inside the lower valve body to compress the first sealing ring.

[0009] In some embodiments, an outer wall of the annular boss is provided with a mounting groove, and a second sealing ring provided in the mounting groove is tightly sealed against the inner wall of the lower valve body.

[0010] In some embodiments, a third sealing ring is provided inside the upper valve body between the through groove and the limiting boss.

[0011] In some embodiments, the cross-section of the coil spring is rectangular.

[0012] In some embodiments, a locking nut provided on the outside of the upper valve body is tightly pressed against the end of the lower valve body.

[0013] In some embodiments, a blade ring is provided at the opening of the inlet end of the upper valve body and the opening of the outlet end of the lower valve body, respectively, and the blade ring is fixed by a set nut.

[0014] In some embodiments, anti-loosening wire holes are respectively provided at positions close to the upper valve body and the lower valve body.

[0015] The above technical solution provided by this application has the following advantages compared with the existing technology:

[0016] The upper valve body, valve stem and lower valve body of the utility model are assembled to form a straight-through structure with a simple structure, good sealing reliability, high working stability, fast response speed and accurate unloading precision. When the valve is working, the pressure on the high-pressure side can be released to the low-pressure side in time, thereby protecting the various components of the system from being damaged by high pressure, significantly improving the stability and reliability of the system, extending the service life of the system, and being able to withstand greater pressure. It is more suitable for compressed gas or fluid medium with higher pressure. At the same time, for pipeline systems under low flow rate and high pressure difference environment, it improves working efficiency, reduces leakage and improves repeatability, so as to meet the precise requirements for pressure control in different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 This is the internal structure diagram of the straight-through regulating unloading valve of the utility model;

[0019] Figure 2 This is a structural diagram of the straight-through regulating unloading valve of the utility model;

[0020] Figure 3This is a structural diagram of the valve stem of the utility model;

[0021] Figure 4 This is a structural diagram of the valve stem of the utility model.

[0022] Description of Figure Numbers:

[0023] 1-upper valve body; 2-coil spring; 3-lower valve body; 4-blade ring; 5-nut; 6-locking nut; 7-first valve stem; 8-second valve stem; 9-sealing seat; 10-first sealing ring; 11-pressing screw sleeve; 12-annular boss; 13-second sealing ring; 14-limiting boss; 15-through groove; 16-third sealing ring; 17-anti-loosening wire hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] like Figure 1-4As shown, the utility model proposes a straight-through regulating unloading valve, including an upper valve body 1, a valve stem, a coil spring 2 and a lower valve body 3. The inlet and outlet openings at both ends of the upper valve body 1 and the lower valve body 3 and the unloading channel of the valve stem are connected and formed into a straight-through structure. The opening at the inlet end of the upper valve body 1 and the opening at the outlet end of the lower valve body 3 are respectively provided with a blade ring 4, and the blade ring 4 is fixed by a nut 5.

[0028] like Figure 1 As shown, the valve stem is movably arranged in the cavity formed by the assembly of the upper valve body 1 and the lower valve body 3, and the locking nut 6 arranged on the outside of the upper valve body 1 is tightly pressed against the end of the lower valve body 3. When the upper valve body 1 and the lower valve body 3 are assembled and adjusted, the locking nut 6 is pressed against the end of the lower valve body 3 to limit the position. The valve stem includes a first valve stem 7 and a second valve stem 8, wherein the second valve body is placed inside the lower valve body 3, and its end is tightly sealed against the sealing seat 9 set inside the lower valve body 3, and a first sealing ring 10 is provided between the second valve stem 8 and the sealing seat 9, a compression screw sleeve 11 set inside the lower valve body 3 and the second valve stem 8 press the first sealing ring 10, and the coil spring 2 is sleeved on the outside of the first valve stem 7 and the second valve stem 8, and one end thereof is pressed against the annular boss 12 set on the outer wall of the second valve stem 8, and the outer wall of the annular boss 12 of the second valve body is provided with a mounting groove , the second sealing ring 13 arranged in the mounting groove is sealed tightly against the inner wall of the lower valve body 3, and the other end is against the limiting boss 14 arranged on the inner wall of the upper valve body 1. The first valve stem 7 is assembled on the second valve stem 8, and its end is inserted into the through groove 15 provided in the upper valve body 1. A third sealing ring 16 is provided inside the upper valve body 1 between the through groove 15 and the limiting boss 14. The third sealing ring 16 is sealed with the outer wall of the first valve stem 7. Through the first sealing ring 10, the second sealing ring 13 and the third sealing ring 16, a sealing structure is formed between the first valve stem 7, the second valve stem 8 and the cavity of the upper valve body 1 and the lower valve body 3, thereby preventing corrosive gas or fluid from contacting corrosion-resistant components such as the rectangular coil spring 2, ensuring the service life and compression strength of the coil spring 2 and various components, and thus ensuring the accuracy and reliability of the valve operation.

[0029] In this embodiment, the upper valve body 1, the valve stem and the lower valve body 3 are assembled to form a straight-through structure, which has a simple structure, good sealing reliability, high working stability, fast response speed, and accurate unloading accuracy. When the valve is working, the pressure on the high-pressure side can be released to the low-pressure side in time, protecting the various components of the system from damage by high pressure, significantly improving the stability and reliability of the system, extending the service life of the system, and being able to withstand greater pressure. It is more suitable for compressed gases or fluid media with higher pressures. At the same time, for pipeline systems in low flow rate and high pressure difference environments, it improves work efficiency, reduces leakage, and improves repeatability, so as to meet the precise requirements for pressure control in different application scenarios.

[0030] Furthermore, anti-loosening wire holes 17 are respectively provided at positions close to the upper valve body 1 and the lower valve body 3. After adjusting the setting value according to different unloading pressure setting values, the locking nut 6 is limited and the anti-loosening wire hole 17 is locked using a lead seal assembly to lock the upper valve body 1 and the lower valve body 3 to prevent loosening and avoid misoperation.

[0031] In this embodiment, the cross-section of the coil spring 2 is rectangular, and the coil spring 2 is a replaceable device. According to different unloading pressure requirements, coil springs of different strengths can be replaced. It is not limited to coil springs with different compression amounts such as extremely light load, light load, medium load, heavy load, and extremely heavy load. The size of the coil spring is a universal size and can be specially designed and customized for the pressure unloading value. It has good versatility and diverse choices, realizes precise adjustment of the unloading pressure, and is simple and quick to operate.

[0032] In this embodiment, the upper valve body 1 and the lower valve body 3 are made of but not limited to 316L stainless steel, Hastelloy, and titanium alloy materials, and the first sealing ring 10, the second sealing ring 13, and the third sealing ring 16 are made of but not limited to fluororubber, nitrile rubber, and perfluororubber sealing materials, so that they have good temperature resistance, chemical corrosion resistance, compressibility and resilience, impermeability, and low stress relaxation.

[0033] This straight-through regulating unloading valve controls the opening pressure of the pressure relief valve by the tension of the coil spring 2. After the unloading pressure of the valve body is adjusted, first tighten the locking nut 6 to make it close to the lower valve body 3 for limiting the position, and then use the lead seal assembly to lock the anti-loosening wire hole 17 to lock the upper valve body 1 and the lower valve body 3 for tightening to prevent loosening and avoid misoperation. When the regulating unloading valve is working, the pre-tightening force of the coil spring 2 pushes the second valve stem 8 toward the air inlet of the lower valve body 3. After the second valve stem 8 is stressed, it contacts the first sealing ring 10 to form an air inlet sealing effect. See the attached figure. Figure 3 As shown, compressed air enters the valve body from the air inlet of the lower valve body 3. When the pressure exceeds the set value, the compressed air pushes the second valve stem 8 and the first valve stem 7 to perform piston movement. The coil spring 2 is deformed by the pressure, and the valve stem unloading channel is opened. The compressed gas can only be leaked out of the unloading channel in the center of the valve stem through the first sealing ring 10, the second sealing ring 13 and the third sealing ring 16, and can prevent corrosive gas or corrosive liquid from directly contacting corrosion-resistant components such as the coil spring 2, causing corrosion and affecting the service life and function of the valve body. The compressed gas flows out from the unloading channel in the center of the valve stem and is discharged through the valve outlet to reduce the pressure. When the pressure returns to below the set value, the coil spring 2 returns to its original state, the second valve stem 8 is forced to contact the first sealing ring 10 to form a seal, the unloading channel is closed, and the valve returns to normal working state. At this time, the unloading valve is adjusted to complete an operation cycle and enter the next step to complete the set work task.

[0034] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A straight-through regulating unloading valve, characterized in that: It includes an upper valve body, a valve stem, a coil spring and a lower valve body. The inlet and outlet openings at both ends of the upper valve body and the lower valve body and the unloading channel of the valve stem are connected to form a straight-through structure. The valve stem is movably arranged in a cavity formed by the assembly of the upper valve body and the lower valve body. The valve stem includes a first valve stem and a second valve stem, wherein the second valve body is placed inside the lower valve body, and the end of the second valve stem is tightly sealed against a sealing seat provided inside the lower valve body. The first valve stem is assembled on the second valve stem, and the end of the first valve stem is inserted into a through groove provided in the upper valve body. The coil spring is sleeved on the outside of the first valve stem and the second valve stem, one end of which is against the annular boss provided on the outer wall of the second valve stem, and the other end is against the limiting boss provided on the inner wall of the upper valve body, so that the second valve stem is pressed tightly against the sealing seat under the action of the coil spring.

2. The straight-through regulating unloading valve according to claim 1, characterized in that: A first sealing ring is provided between the second valve stem and the sealing seat, and a compression screw sleeve and the second valve stem are provided inside the lower valve body to compress the first sealing ring.

3. The straight-through regulating unloading valve according to claim 1, characterized in that: The outer wall of the annular boss is provided with a mounting groove, and the second sealing ring arranged in the mounting groove is tightly sealed against the inner wall of the lower valve body.

4. The straight-through regulating unloading valve according to claim 1, characterized in that: A third sealing ring is provided inside the upper valve body at a position between the through groove and the limiting boss.

5. The straight-through regulating unloading valve according to claim 1, characterized in that: The cross section of the coil spring is rectangular.

6. The straight-through regulating unloading valve according to claim 1, characterized in that: A locking nut provided on the outside of the upper valve body is tightly pressed against the end of the lower valve body.

7. The straight-through regulating unloading valve according to claim 1, characterized in that: The opening of the inlet end of the upper valve body and the opening of the outlet end of the lower valve body are respectively provided with a blade ring, and the blade rings are fixed by a set nut.

8. The straight-through regulating unloading valve according to claim 1, characterized in that: Anti-loosening wire holes are respectively provided at positions close to the upper valve body and the lower valve body.

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