Safety valve

Abstract

According to the safety valve, when an ejector rod barrel is pressed downwards, when a first overflow hole just reaches the position of a first inner hole, the first overflow hole does not reach the position of a second inner hole, and when the first overflow hole reaches the position of the second inner hole, the first overflow hole still corresponds to the first inner hole; according to the safety valve, the valve element piece is broken into the first valve element and the second valve element, the machining difficulty is reduced, when the first overflow hole just reaches the position of the first inner hole, the first overflow hole does not reach the position of the second inner hole, hydraulic oil flowing out of the first overflow hole flows out of the first outer hole through the first inner hole, the first overflow hole is a kidney-shaped hole, and the machining difficulty is reduced. The ejector rod barrel provides the overflow effect within a certain stroke range, and the overflow speed can be correspondingly adjusted according to the change of the matching degree between the first overflow hole and the first inner hole. When the first overflow hole reaches the position of the second inner hole, the first overflow hole still corresponds to the first inner hole, and at the moment, the ejector rod barrel completes discharging of hydraulic oil to the maximum extent.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of safety valve, especially a safety valve. BACKGROUND

[0002] Safety valve is a kind of protection device, is installed on pressure vessel or pipeline system. When the pressure in the system exceeds the set value, safety valve will open automatically, releases pressure, to prevent high pressure from causing equipment damage or danger. It plays the role of protecting equipment and personnel safety. Safety valve is installed on the hydraulic support of coal mining face, as overload protection element, ensure that the support has constant resistance working characteristic when roof subsides, generally combined with corresponding hydraulic control check valve.

[0003] Generally, when the liquid pressure in the working cavity of the support cylinder reaches or exceeds the rated pressure, the high-pressure liquid passes through the valve core of the safety valve and gives the spring a pushing force through the jacking rod, the jacking rod and the valve core move axially, the small hole on the valve core exceeds the O-ring, and the liquid is overflowed through the small hole and the gap between the valve body, so that the liquid pressure in the working cavity of the support is reduced and always close to its rated pressure value. When the liquid pressure is slightly lower than the set pressure, the jacking rod pushes the valve core to reset and restores the closed state under the action of the spring force.

[0004] At present, the hydraulic oil discharge speed of the safety valve is only related to the pressure of the hydraulic oil, and is not related to the displacement of the jacking rod, so that in the case of large hydraulic oil pressure, the jet of the hydraulic oil is large, which is not conducive to the running noise and the running safety. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a safety valve, which aims to solve the problem that the hydraulic oil discharge speed of the current safety valve is only related to the pressure of the hydraulic oil, and in the case of large hydraulic oil pressure, the jet of the hydraulic oil is large, which is not conducive to the running noise and the running safety.

[0006] In order to achieve the above purpose, the utility model provides a safety valve, which comprises:

[0007] The valve cylinder body is provided with a plurality of first outer holes and second outer holes arranged in a circumferential direction at intervals in length;

[0008] The first valve core is a cylindrical shape, is installed from one end of the valve cylinder body, and is provided with a plurality of first inner holes corresponding to the first outer holes in a circumferential direction;

[0009] The second valve core is a cylindrical shape, is screw-connected to the inner wall of one end of the valve cylinder body and fixes the first valve core, and is provided with a plurality of second inner holes corresponding to the second outer holes in a circumferential direction;

[0010] A top rod barrel is slidably arranged at one end of the valve barrel body from the middle of the valve barrel body to the first valve core and the second valve core, and a plurality of first overflow holes corresponding to the first inner hole and a plurality of first overflow holes corresponding to the second inner hole are arranged circumferentially on the top rod barrel, the first overflow hole is a waist-shaped hole and the length is greater than the diameter of the first inner hole;

[0011] A rod cap is arranged at the outer end of the top rod barrel.

[0012] A valve shell is sleeved on one end of the valve barrel body in the length direction, and a fixed head is threadedly connected to the end away from the valve barrel body.

[0013] A spring is compressed between the rod cap and the fixed head.

[0014] When the first overflow hole just reaches the position of the first inner hole, the first overflow hole does not reach the position of the second inner hole, and when the first overflow hole reaches the position of the second inner hole, the first overflow hole still corresponds to the first inner hole.

[0015] Further, the inner wall and the outer wall of the first valve core are provided with a first groove ring in the form of a ring at the position of the first inner hole, and the inner wall and the outer wall of the second valve core are provided with a second groove ring in the form of a ring at the position of the second inner hole.

[0016] Further, the first valve core is fixed in the circumferential direction with the valve barrel body, and the top rod barrel is fixed in the circumferential direction with the first valve core.

[0017] Further, the inner wall of the first valve core and the inner wall of the second valve core are provided with a sealing ring in the length direction corresponding to clamping the first inner hole.

[0018] Further, when the first overflow hole reaches the position of the second inner hole, the first valve core abuts and fixes the top rod barrel.

[0019] Further, the spring is directly connected with the rod cap.

[0020] Further, the diameter of the first outer hole is greater than that of the first inner hole, and the diameter of the second outer hole is greater than that of the second inner hole.

[0021] Further, the surface of the top rod barrel in contact with the rod cap is a spherical surface, and the surface of the rod cap in contact with the top rod barrel is a spherical groove.

[0022] Further, an external thread is arranged on the inner and outer periphery of the fixed head, and an internal thread is arranged on the part of the valve shell corresponding to the fixed head.

[0023] Further, the part where the valve shell is connected with the valve barrel is an internal thread, and the part where the valve barrel is connected with the valve shell is an external thread.

[0024] The safety valve provided by the utility model, the valve core piece is broken into a first valve core and a second valve core, the processing difficulty is reduced, when the first overflow hole just reaches the position of the first inner hole, the first overflow hole does not reach the position of the second inner hole, the hydraulic oil flowing out of the first overflow hole flows out from the first outer hole through the first inner hole, and since the first overflow hole is a waist hole, the ejector bucket can provide the overflow effect within a certain stroke range, and the matching degree between the first overflow hole and the first inner hole changes, and the speed of overflow can also be adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the safety valve of the first embodiment of the utility model;

[0026] Figure 2 is a cross-sectional schematic view of the safety valve of the first embodiment of the utility model (pressure maintaining state);

[0027] Figure 3 is a cross-sectional schematic view of the safety valve of the first embodiment of the utility model (ejector bucket and rod cap are hidden);

[0028] Figure 4 is the first embodiment of the utility model;

[0029] Figure 5 is a cross-sectional schematic view of the safety valve of the first embodiment of the utility model (pressure relief state).

[0030] REFERENCE SIGNS:

[0031] Valve barrel (100), first outer hole (110), second outer hole (120), first valve core (200), first inner hole (210), first groove ring (220), second groove ring (230), second valve core (300), second inner hole (310), ejector bucket (400), first overflow hole (410), first overflow hole (420), rod cap (500), valve shell (600), fixed head (610).

[0032] The realization, functional features and advantages of the utility model will be further explained by combining with the embodiments and referring to the drawings. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0034] Those skilled in the art can understand that, unless specifically stated otherwise, the singular form "a", "an", "said" and "the" used herein also includes the plural form. It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, elements, units, modules and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components and / or combinations thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any combination of the associated listed items and all combinations thereof.

[0035] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0036] With reference to Figures 1 to 5 In an embodiment of the present application, a safety valve comprises:

[0037] A valve cylinder body 100 is provided with a plurality of first outer holes 110 and second outer holes 120 arranged in a circumferential direction at intervals in length;

[0038] A first valve core 200 in the shape of a cylinder is fitted into one end of the valve cylinder body 100 and is provided with a plurality of first inner holes 210 corresponding to the first outer holes 110;

[0039] A second valve core 300 in the shape of a cylinder is threadedly connected to the inner wall of one end of the valve cylinder body 100 and fixes the first valve core 200, and is provided with a plurality of second inner holes 310 corresponding to the second outer holes 120;

[0040] A top rod barrel 400 is slidably arranged at one end of the valve barrel 100 from the middle of the valve barrel 100, and a plurality of first overflow holes 410 corresponding to the first inner holes 210 and a plurality of first overflow holes 420 corresponding to the second inner holes 310 are arranged in the circumference of the top rod barrel 400, and the first overflow holes 410 are in the shape of a waist hole and the length is greater than the diameter of the first inner holes 210.

[0041] A rod cap 500 is arranged at the outer end of the top rod barrel 400.

[0042] A valve shell 600 is sleeved on one end of the valve barrel 100 in the length direction, and a fixed head 610 is threadedly connected to the end away from the valve barrel 100.

[0043] A spring 700 is compressed between the rod cap 500 and the fixed head 610.

[0044] When the top rod barrel 400 is pressed down, when the first overflow holes 410 just reach the position of the first inner holes 210, the first overflow holes 420 do not reach the position of the second inner holes 310, and when the first overflow holes 420 reach the position of the second inner holes 310, the first overflow holes 410 still correspond to the first inner holes 210.

[0045] In the prior art, the hydraulic oil discharge speed of the safety valve is only related to the pressure of the hydraulic oil, and is not related to the displacement of the top rod, so that in the case that the hydraulic oil pressure is large, the jet of the hydraulic oil is large, which is not conducive to the operation noise and the operation safety.

[0046] In the utility model, a plurality of circumferentially arranged first outer holes 110 and a plurality of circumferentially arranged second outer holes 120 are arranged on the length of the valve barrel 100. The plurality of first outer holes 110 are arranged in a ring shape, the plurality of second outer holes 120 are arranged in a ring shape, and the first outer holes 110 and the second outer holes 120 are the discharge positions of the final hydraulic oil.

[0047] The cylindrical first valve core 200 is arranged in the valve barrel 100 from one end, and a plurality of first inner holes 210 corresponding to the plurality of first outer holes 110 are arranged in the circumference.

[0048] The cylindrical second valve core 300 is threadedly connected to the inner wall of one end of the valve barrel 100 and fixes the first valve core 200 in the valve barrel 100. The second valve core 300 is arranged in the circumference and a plurality of second inner holes 310 corresponding to the plurality of second outer holes 120.

[0049] The top rod barrel 400 is slidably arranged in the valve barrel 100 from the middle of the valve barrel 100 to one end of the valve barrel 100, and the open end of the top rod barrel 400 is inside the valve barrel 100, and the closed end of the top rod barrel 400 is outside the valve barrel 100. A plurality of first overflow holes 410 corresponding to the first inner holes 210 and a plurality of first overflow holes 420 corresponding to the second inner holes 310 are arranged on the circumferential wall of the top rod barrel 400. The first overflow holes 410 and the first overflow holes 420 are the outflow positions when the hydraulic oil pressure in the top rod barrel 400 is relatively large. The first overflow holes 410 are waist-shaped holes and the length is greater than the diameter of the first inner holes 210. A rod cap 500 is arranged corresponding to the outer end of the top rod barrel 400, that is, the rod cap 500 cooperates with the closed first end of the top rod barrel 400. A valve shell 600 is sleeved on one end of the valve barrel 100 in the length direction, and a fixed head 610 is threadedly connected to the end of the valve barrel 100 away from the valve barrel 100. A spring 700 is compressed between the rod cap 500 and the fixed head 610. The main function of the valve shell 600 is to provide a mounting space for the spring 700. The position adjustment of the fixed head 610 can adjust the compression state of the spring 700.

[0050] The hydraulic oil in the top rod barrel 400 generates a driving force to force the top rod barrel 400 to slide outward, and the top rod barrel 400 is blocked by the spring 700 when sliding outward, and when the pressure of the hydraulic oil is too large, the top rod barrel 400 overcomes the elastic force of the spring 700 to slide outward. When the first overflow hole 410 just reaches the position of the first inner hole 210, the first overflow hole 420 does not reach the position of the second inner hole 310, and the hydraulic oil flowing out of the first overflow hole 410 flows out of the first outer hole 110 through the first inner hole 210. Because the first overflow hole 410 is a waist hole, the top rod barrel 400 can provide overflow effect within a certain stroke range, and the matching degree between the first overflow hole 410 and the first inner hole 210 changes, which can also adjust the overflow speed. When the first overflow hole 420 reaches the position of the second inner hole 310, the first overflow hole 410 still corresponds to the first inner hole 210, and at this time the top rod barrel 400 completes the maximum degree of hydraulic oil discharge.

[0051] In summary, the valve core piece is broken into a first valve core 200 and a second valve core 300, which reduces the processing difficulty. When the first overflow hole 410 just reaches the position of the first inner hole 210, the first overflow hole 420 does not reach the position of the second inner hole 310. The hydraulic oil flowing out of the first overflow hole 410 flows out of the first outer hole 110 through the first inner hole 210. Since the first overflow hole 410 is a waist hole, the ejector bucket 400 can provide an overflow effect within a certain stroke range. The matching degree between the first overflow hole 410 and the first inner hole 210 changes, and the overflow speed can also be adjusted accordingly. When the first overflow hole 420 reaches the position of the second inner hole 310, the first overflow hole 410 still corresponds to the first inner hole 210. At this time, the ejector bucket 400 completes the maximum degree of hydraulic oil discharge. The above arrangement makes the hydraulic oil discharge process smooth and highly adaptable.

[0052] With reference to Figure 3 In one embodiment, the inner wall and the outer wall of the first valve core 200 are provided with a first groove ring 220 in the form of a ring at the position of the first inner hole 210. The inner wall and the outer wall of the second valve core 300 are provided with a second groove ring 230 in the form of a ring at the position of the second inner hole 310.

[0053] In this embodiment, taking the first groove ring 220 as an example, the first groove ring 220 connects the plurality of first inner holes 210 in series. Correspondingly, the first groove ring 220 also connects the plurality of first outer holes 110 in series. The hydraulic oil overflowing from the first overflow hole 410 of the ejector bucket 400 will smoothly enter the first inner hole 210 through the first groove ring 220 on the inner side. The hydraulic oil overflowing from any one of the first inner holes 210 will flow into the first groove ring 220 on the outer side, and then overflow from the first outer hole 110. The arrangement of the first groove ring 220 makes the flow of hydraulic oil more smooth. The related groove structures are arranged on the first valve core 200 and the second valve core 300, thereby reducing the processing difficulty of other components.

[0054] In one embodiment, the first valve core 200 is fixed in the circumferential direction with the valve cylinder body 100, and the ejector bucket 400 is fixed in the circumferential direction with the first valve core 200.

[0055] In this embodiment, the circumferential fixation makes the hole positions form a positioning relationship, avoiding impact. The circumferential fixation can be various, for example, the cross section of the outer periphery of the first valve core 200 is in the form of an ellipse, and the cross section of the inner periphery of the valve cylinder body 100 corresponds to an ellipse. In this way, the two cannot rotate relative to each other. Alternatively, the first valve core 200 and the valve cylinder body 100 are provided with a matching structure of protrusions and grooves, thereby forming a circumferential fixation.

[0056] With reference to Figure 2In one embodiment, the inner wall of the first valve core 200 and the inner wall of the second valve core 300 are provided with sealing rings in the length direction corresponding to clamping the first inner hole 210.

[0057] In the embodiment, the sealing effect of the overall structure is improved by introducing the sealing ring, and the working process of the safety valve is ensured. The form of the sealing ring is not limited, which can be a conventional O-ring, and the shape is not limited, which can also be multiple settings.

[0058] Referring to Figure 5 In one embodiment, when the first overflow hole 420 reaches the position of the second inner hole 310, the first valve core 200 abuts against and fixes the top rod barrel 400.

[0059] Considering that in the general structure, the top rod barrel 400 is provided with a limit position, at which the top rod barrel 400 cannot further compress the spring, and the process of discharging hydraulic oil is continuously completed; in the embodiment, when the first overflow hole 420 reaches the position of the second inner hole 310, the first valve core 200 abuts against and fixes the top rod barrel 400, so that the maximum degree of hydraulic oil discharge process can be completed. The specific limiting method can be that a protruding ring is arranged on the open end of the top rod barrel 400, and when the protruding ring abuts against the first valve core 200, the sliding of the top rod barrel 400 is limited.

[0060] In one embodiment, the spring 700 is directly connected with the rod cap 500.

[0061] In the embodiment, the spring 700 is connected with the rod cap 500, so that the installation and disassembly difficulty of the rod cap 500 is reduced. In a specific implementation process, a clamping structure can be arranged at the corresponding position of the rod cap 500, so as to fix the spring 700.

[0062] In one embodiment, the diameter of the first outer hole 110 is greater than that of the first inner hole 210, and the diameter of the second outer hole 120 is greater than that of the second inner hole 310.

[0063] In the embodiment, the diameters of the first outer hole 110 and the second outer hole 120 are expanded, the requirement for alignment is reduced, the hydraulic oil flows more smoothly, and the resistance is smaller.

[0064] Referring to Figure 2 In one embodiment, the surface of the top rod barrel 400 in contact with the rod cap 500 is a spherical surface, and the surface of the rod cap 500 in contact with the top rod barrel 400 is a spherical groove.

[0065] In the embodiment, the cooperation and action between the two are smoothed, and the cooperation position of the ejector rod barrel 400 and the cooperation position of the rod cap 500 are semispherical surfaces and semispherical grooves, respectively.

[0066] In one embodiment, the fixed head 610 is provided with external threads on the inner and outer periphery, and the valve housing 600 is provided with internal threads corresponding to the fixed head 610.

[0067] In the embodiment, the fixed head 610 is fixed in the valve housing 600, so that the overall structure is more compact, and the installation convenience is improved.

[0068] In one embodiment, the valve housing 600 and the valve cylinder body 100 are connected by internal threads, and the valve cylinder body 100 and the valve housing 600 are connected by external threads.

[0069] In the embodiment, a convenient way of fixing the valve housing 600 is provided, and space is provided for the installation of the second valve core 300.

[0070] In summary, the safety valve provided by the utility model has the advantages that the valve core member is broken into a first valve core 200 and a second valve core 300, the machining difficulty is reduced, when the first overflow hole 410 just reaches the position of the first inner hole 210, the first overflow hole 420 does not reach the position of the second inner hole 310, the hydraulic oil flowing out of the first overflow hole 410 flows out of the first outer hole 110 through the first inner hole 210, the first overflow hole 410 is a waist hole, so that the ejector rod barrel 400 can provide the overflow effect within a certain stroke range, and the matching degree between the first overflow hole 410 and the first inner hole 210 changes, so that the overflow speed can also be adjusted. When the first overflow hole 420 reaches the position of the second inner hole 310, the first overflow hole 410 still corresponds to the first inner hole 210, at this time, the ejector rod barrel 400 completes the maximum degree of hydraulic oil discharge, the above arrangement makes the hydraulic oil discharge process smooth and strong in adaptability, so that the operation noise and the use safety are improved.

[0071] The above description is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A relief valve characterized by, The utility model relates to a valve, comprising: a valve barrel with a plurality of first outer holes and second outer holes arranged in a circumferential direction at intervals along the length of the valve barrel; a first valve core in the shape of a cylinder, which is fitted into one end of the valve barrel and has a plurality of first inner holes corresponding to the first outer holes; a second valve core in the shape of a cylinder, which is screwed into the inner wall of one end of the valve barrel and fixes the first valve core, and has a plurality of second inner holes corresponding to the second outer holes; a top rod barrel, which is slidably arranged in one end of the valve barrel from the middle of the valve barrel through the first valve core and the second valve core, and has a plurality of first overflow holes corresponding to the first inner holes and a plurality of first overflow holes corresponding to the second inner holes arranged in a circumferential direction, wherein the first overflow holes are in the shape of a waist hole and have a length greater than the diameter of the first inner holes; a rod cap arranged corresponding to the outer end of the top rod barrel; a valve shell, which is sleeved on one end of the valve barrel in the length direction and has a fixing head screwed into the end of the valve barrel away from the valve barrel; a spring compressed between the rod cap and the fixing head; wherein, when the first overflow holes just reach the position of the first inner holes, the first overflow holes do not reach the position of the second inner holes, and when the first overflow holes reach the position of the second inner holes, the first overflow holes still correspond to the first inner holes, when the top rod barrel is pressed down.

2. The safety valve of claim 1, wherein The inner wall and the outer wall of the first valve core are both provided with a first groove ring in the shape of a ring at the position of the first inner holes, and the inner wall and the outer wall of the second valve core are both provided with a second groove ring in the shape of a ring at the position of the second inner holes.

3. The safety valve of claim 1, wherein The first valve core is fixed in a circumferential direction with the valve barrel, and the top rod barrel is fixed in a circumferential direction with the first valve core.

4. The safety valve of claim 1, wherein The inner wall of the first valve core and the inner wall of the second valve core are provided with a sealing ring in the length direction corresponding to clamping the first inner holes.

5. The safety valve of claim 1, wherein When the first overflow holes reach the position of the second inner holes, the first valve core abuts against and fixes the top rod barrel.

6. The safety valve according to any one of claims 1 to 5, characterized in that The spring is directly connected with the rod cap.

7. The safety valve according to any one of claims 1 to 5, characterized in that The diameter of the first outer holes is greater than that of the first inner holes, and the diameter of the second outer holes is greater than that of the second inner holes.

8. The safety valve according to any one of claims 1 to 5, characterized in that The surface of the top rod barrel in contact with the rod cap is a spherical surface, and the surface of the rod cap in contact with the top rod barrel is a spherical groove.

9. The safety valve according to any one of claims 1 to 5, characterized in that The fixing head is provided with external threads on the inner and outer periphery, and the valve shell is provided with internal threads corresponding to the fixing head.

10. The safety valve according to any one of claims 1 to 5, characterized in that The part of the valve shell connected with the valve barrel is an internal thread, and the part of the valve barrel connected with the valve shell is an external thread.

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