Safety valve with novel structure

Abstract

The utility model relates to a safety valve with a novel structure. The safety valve comprises a valve body, a valve seat, a valve rod, a guide sleeve and a valve clack, a medium inflow channel is arranged on the valve seat, a medium outflow channel is arranged on the valve body, and a spring is sleeved on the valve rod. The guide sleeve is installed on the valve seat, a guide sleeve fixing structure for fixing the guide sleeve is arranged on the valve seat or the valve body, the valve clack is movably installed in the guide sleeve in the axis direction of the guide sleeve in a guiding mode, the valve rod stretches into the guide sleeve to be connected with the valve clack, and a water outlet hole channel used for communicating the medium inflow channel with the medium outflow channel is formed in the cavity wall of the guide sleeve. Compared with the prior art, the machining precision of the guide sleeve is greatly reduced. And the guide parts are large in size and reliable in sealing. And the matching diameter of the guide sleeve and the valve clack is not limited by the outer diameter of the spring, so that the valve is particularly suitable for small-caliber high-pressure occasions, and materials are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a safety valve with a new structure. Background Art

[0002] The safety valve plays a role of safety protection in the system. When the system pressure exceeds the specified value, the safety valve opens and discharges part of the gas / fluid in the system into the atmosphere / out of the pipeline, so that the system pressure does not exceed the allowable value, thereby ensuring that the system does not cause accidents due to excessive pressure. The traditional safety valve includes a valve body, a valve seat, a valve stem, a guide sleeve and a valve disc, such as Figure 1 As shown, the valve seat is provided with a medium inflow channel, the valve body is provided with a medium outflow channel, and the valve disc is used to block and open the medium inflow channel on the valve seat to realize the opening and closing of the valve. In the above structure, the guide sleeve is nested inside the valve body, the valve disc is guided and moved inside the guide sleeve, the valve stem and the valve disc are connected together and can be driven by the valve stem to realize the opening and closing of the valve, and a spring is sleeved on the valve stem to provide the opening pressure.

[0003] However, the safety valve of the above structure has the following disadvantages: since the guide sleeve is nested in the inner cavity of the valve body, the processing accuracy of the guide sleeve is very high, and the tightness of the guide sleeve is not easy to ensure. If it is too loose, the guide sleeve is easy to fall off, and if it is too tight, the guide sleeve is difficult to disassemble and assemble, and it is not easy to repair. Moreover, the size of the safety valve of this structure is affected by the outer diameter of the spring. The larger the outer diameter of the spring, the larger the matching diameter of the valve disc and the guide sleeve. If the sealing surface of the valve disc remains unchanged, the outer diameter of the valve disc will be larger, which is not conducive to material saving and increases the production cost. Moreover, the safety valve of this structure has a short guide part between the valve disc and the guide sleeve due to the influence of the structure, which leads to poor neutrality between the valve disc sealing surface and the valve seat sealing surface. The center of the valve disc sealing surface and the center of the valve seat sealing surface are prone to radial deviation. The resultant force of the spring force transmitted to the sealing surface through the valve stem and the valve disc is not in a straight line with the resultant force of the medium, which easily causes the situation that one side of the sealing surface is subjected to greater force and the other side is subjected to less force, causing the sealing surface to leak easily. Utility Model Content

[0004] The utility model aims to provide a safety valve with a new structure, so as to solve the problems existing in the prior art that the safety valve with the existing structure is difficult to ensure the tightness of the guide sleeve and has high requirements on the processing accuracy of the guide sleeve.

[0005] To achieve the above-mentioned purpose, a safety valve with a new structure of the utility model adopts the following technical scheme: a safety valve with a new structure, comprising a valve body, a valve seat, a valve stem, a guide sleeve and a valve disc, a medium inflow channel is provided on the valve seat, a medium outflow channel is provided on the valve body, a spring is sleeved on the valve stem, the guide sleeve is installed on the valve seat, a guide sleeve fixing structure for fixing the guide sleeve is provided on the valve seat or the valve body, the valve disc is movably installed inside the guide sleeve along the axial direction of the guide sleeve, the valve stem extends into the guide sleeve and is connected with the valve disc, and a water outlet channel for connecting the medium inflow channel and the medium outflow channel is provided on the cavity wall of the guide sleeve.

[0006] The guide sleeve is a cylinder structure with an opening facing the valve seat, and a through hole for the valve stem to pass through is arranged on the bottom of the cylinder structure.

[0007] The valve seat has a mounting portion located in the valve body, the medium inflow channel is communicated with the inner cavity of the valve body through the mounting portion, and the opening of the guide sleeve is mounted on the mounting portion.

[0008] The opening positioning sleeve of the guide sleeve is sleeved on the mounting portion, the guide sleeve fixing structure comprises a locking screw arranged on the valve body, and a mounting hole for the locking screw to extend into to achieve fixation is arranged on the cavity wall of the guide sleeve.

[0009] The locking screw comprises a bolt head located outside the valve body, a threaded connection section threadedly connected to the valve body, and a positioning optical path section for extending into the mounting hole.

[0010] The mounting portion is provided with a positioning step, and the opening of the guide sleeve is a step structure that is positioned and matched with the positioning step.

[0011] There is a mating surface between the valve seat and the valve disc, which includes a valve disc mating surface arranged on the valve seat and a valve seat mating surface arranged on the valve disc, a first hard sealing ring is arranged on the valve disc mating surface, and a second hard sealing ring that seals with the first hard sealing ring is arranged on the valve seat mating surface.

[0012] The beneficial effects of the utility model are as follows: the guide sleeve is directly mounted on the valve seat and fixed by the guide sleeve fixing structure, and the valve disc is movably mounted in the guide sleeve. Compared with the prior art, such a setting greatly reduces the processing accuracy of the guide sleeve. Moreover, the guide part between the valve disc and the guide sleeve can be the axial size of the entire valve disc. The guide parts of the two are relatively large in size, the valve seat sealing surface and the valve disc sealing surface are well centered, and the matching position accuracy is high, which ensures that the resultant force of the spring on the valve disc and the resultant force of the medium on the valve disc sealing surface are on the same axis, and the sealing is reliable. Moreover, the matching diameter of the guide sleeve and the valve disc is not limited by the outer diameter of the spring, which is particularly suitable for small-caliber and high-pressure occasions, saving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a structural schematic diagram of a safety valve in the background technology;

[0014] Figure 2 It is a structural schematic diagram of an embodiment of a safety valve with a new structure of the utility model;

[0015] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0017] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0018] An embodiment of a safety valve with a new structure according to the utility model is as follows: Figure 2-Figure 3 As shown, it includes a valve body 1, a valve seat 2, a valve stem 5, a guide sleeve 3 and a valve disc 4. The valve seat 2 is provided with a medium inflow channel 8, and the valve body 1 is provided with a medium outflow channel 7. A spring 6 is mounted on the valve stem 5, and the opening pressure is set by the spring. Under the action of the spring, the valve disc seals and blocks the valve seat. The valve stem 5 is connected to the valve disc 4, and is used to be lifted up by the medium together with the valve disc when the medium pressure is greater than the opening pressure. The working principle of the safety valve belongs to the prior art, and the working principle of the spring safety valve is not described in detail in this embodiment.

[0019] The improvement of the utility model is that: in this embodiment, the guide sleeve 3 is installed on the valve seat 2, and a guide sleeve fixing structure for fixing the guide sleeve is provided on the valve body. Specifically, the valve seat 2 has a mounting portion 17 located in the valve body 1, and the medium inflow channel 8 is connected with the inner cavity of the valve body through the mounting portion 17. The guide sleeve 3 is a cylindrical structure with an opening facing the valve seat, and the opening of the guide sleeve 3 is installed on the mounting portion 17. A positioning step is provided on the mounting portion, and the opening of the guide sleeve is a step structure that is positioned and matched with the positioning step. In this embodiment, the guide sleeve fixing structure includes a locking screw 10 provided on the valve body, and a mounting hole 14 is provided on the cavity wall of the guide sleeve for the locking screw to extend into for fixing. Specifically, the locking screw 10 includes a bolt head 11 located outside the valve body, a threaded connection section 12 threadedly connected to the valve body, and a positioning optical path section 13 for extending into the mounting hole.

[0020] The valve disc 4 is installed inside the guide sleeve along the axial direction of the guide sleeve 3. A through hole for the valve stem 5 to pass through is provided on the bottom of the cylinder structure. The valve stem 5 extends into the guide sleeve and is connected to the valve disc 4. The valve disc and the valve stem can move up and down together. Under the action of the spring, the sealing valve seat can be pressed down to close the safety valve. It can also be lifted up to open the safety valve when the medium pressure is greater than the valve disc opening pressure. A water outlet channel 9 for connecting the medium inflow channel 8 and the medium outflow channel 7 is provided on the cavity wall of the guide sleeve. There is a mating surface between the valve seat and the valve disc, which includes a valve disc mating surface provided on the valve seat and a valve seat mating surface provided on the valve disc. A first hard sealing ring 16 is provided on the valve disc mating surface, and a second hard sealing ring 15 that is sealed and matched with the first hard sealing ring is provided on the valve seat mating surface.

[0021] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model according to the specific circumstances.

[0022] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0023] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0024] In other embodiments of the utility model, the locking screw can also be arranged on the valve seat to directly fix the guide sleeve on the valve seat; the positioning step may not be arranged on the mounting portion, or the mounting portion may be a positioning column. In this case, the opening of the guide sleeve is not provided with a step structure, and the guide sleeve can be directly mounted on the positioning column.

Claims

1. A safety valve of a new structure, comprising a valve body, a valve seat, a valve stem, a guide sleeve and a valve disc, wherein the valve seat is provided with a medium inflow channel, the valve body is provided with a medium outflow channel, and the valve stem is provided with a spring, and is characterized in that: The guide sleeve is installed on the valve seat, and a guide sleeve fixing structure for fixing the guide sleeve is provided on the valve seat or the valve body. The valve disc is movably installed inside the guide sleeve along the axial direction of the guide sleeve, and the valve stem extends into the guide sleeve and is connected with the valve disc. A water outlet channel for connecting the medium inflow channel and the medium outflow channel is provided on the cavity wall of the guide sleeve.

2. The safety valve of the novel structure according to claim 1 is characterized in that: The guide sleeve is a cylinder structure with an opening facing the valve seat, and a through hole for the valve stem to pass through is arranged on the bottom of the cylinder structure.

3. The safety valve of the novel structure according to claim 2 is characterized in that: The valve seat has a mounting portion located in the valve body, the medium inflow channel is communicated with the inner cavity of the valve body through the mounting portion, and the opening of the guide sleeve is mounted on the mounting portion.

4. The safety valve of the novel structure according to claim 3 is characterized in that: The opening positioning sleeve of the guide sleeve is sleeved on the mounting portion, the guide sleeve fixing structure comprises a locking screw arranged on the valve body, and a mounting hole for the locking screw to extend into to achieve fixation is arranged on the cavity wall of the guide sleeve.

5. The safety valve of the novel structure according to claim 4 is characterized in that: The locking screw comprises a bolt head located outside the valve body, a threaded connection section threadedly connected to the valve body, and a positioning optical path section for extending into the mounting hole.

6. The safety valve of the novel structure according to claim 3 is characterized in that: The mounting portion is provided with a positioning step, and the opening of the guide sleeve is a step structure that is positioned and matched with the positioning step.

7. The safety valve of the novel structure according to claim 1 is characterized in that: There is a mating surface between the valve seat and the valve disc, which includes a valve disc mating surface arranged on the valve seat and a valve seat mating surface arranged on the valve disc, a first hard sealing ring is arranged on the valve disc mating surface, and a second hard sealing ring that seals with the first hard sealing ring is arranged on the valve seat mating surface.

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