Regulating valve with balanced valve core structure

Abstract

The utility model relates to the technical field of fuel gas pressure regulating equipment, in particular to a regulating valve with a balanced type valve core structure, which comprises a valve body, a valve core, a valve core and a valve core, the valve body is provided with a first cavity channel in the vertical direction, and the valve rod is arranged in the first cavity channel. The valve body is provided with a second cavity channel in the horizontal direction, and the guide rod is arranged in the second cavity channel. A balance cavity and a medium cavity are formed in the valve body; the valve cage is arranged at the joint of the balance cavity and the medium cavity. The end, close to the balance cavity, of the valve cage is provided with a valve cylinder. Wherein the valve cylinder is fixedly connected with the valve rod; a cylinder cover is arranged on the valve cylinder, and a vent hole is formed in the cylinder cover; and the valve seat is arranged at one end of the valve body. In the utility model, when the outlet pressure is smaller than the set pressure, the valve rod moves upwards, and the guide rod and the valve cylinder move rightwards; when the outlet pressure is larger than the set pressure, the valve rod moves downwards, the guide rod and the valve cylinder move leftwards, and the opening degree of the adjusting valve is reduced; when the valve cylinder is opened, natural gas flows into the medium cavity from the balance cavity; when the valve cylinder is closed, natural gas flows into the balance cavity from the medium cavity through the vent hole, and the pressure difference is balanced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pressure regulating equipment, in particular to a regulating valve with a balanced valve core structure. Background Art

[0002] Axial flow control valves have the characteristics of fast response speed, good linearity of flow characteristics, and large adjustable ratio, especially in large systems. For example, axial flow control valves can be used in gas supply systems to adjust gas pressure and flow to ensure stable operation of the system; axial flow control valves can be installed in the pressure regulating system of gas boilers to adjust the flow of gas to ensure normal operation of the boiler; axial flow control valves can be used for pressure reduction and stabilization of gas pipelines to avoid damage to pipelines and equipment caused by excessive pipeline pressure.

[0003] In the field of gas pressure regulation, the working principle of the axial flow regulating valve is to control the gas flow and pressure flowing through the valve body by changing the opening of the valve core and the valve seat to achieve the purpose of gas pressure regulation.

[0004] Under high pressure difference and large flow conditions, axial flow control valves are used to adjust user pressure, flow and gas consumption. When the control valve is working, if the pressure difference of each part of the valve body is different, it will affect the opening and closing of the valve, the input torque will also increase, and the service life of the control valve will be reduced.

[0005] In order to solve the above problems, a regulating valve with a balanced valve core structure is designed.

[0006] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0007] The utility model provides a regulating valve with a balanced valve core structure, thereby effectively solving the problems in the background technology.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a regulating valve with a balanced valve core structure, comprising:

[0009] A valve body, the valve body comprising a valve stem, a guide rod and a valve cage;

[0010] The valve body is provided with a first cavity along the vertical direction, the valve stem is arranged in the first cavity, and the valve stem can reciprocate along the vertical direction;

[0011] The valve body is provided with a second cavity along the horizontal direction, the guide rod is arranged in the second cavity, and the guide rod can reciprocate along the horizontal direction;

[0012] A plurality of balancing chambers and medium chambers are arranged inside the valve body along the axisymmetric direction;

[0013] The valve cage is arranged at the junction of the balancing chamber and the medium chamber, and a valve cylinder is arranged at one end of the valve cage close to the balancing chamber;

[0014] Wherein, the valve cylinder is fixedly connected to the valve stem, and the valve cylinder can reciprocate in the horizontal direction;

[0015] The valve cylinder is provided with a cylinder cover, and the cylinder cover is evenly provided with a plurality of vent holes;

[0016] A valve seat is fixedly arranged at one end of the valve body.

[0017] Furthermore, the ventilation holes are configured as round waist holes evenly distributed along the circumferential direction.

[0018] Furthermore, an actuator is fixedly disposed above the first cavity, and the actuator is fixedly connected to the valve stem.

[0019] Furthermore, the actuator changes its motion state by relying on the controller;

[0020] The controller changes the output current through PID calculation to achieve the movement of the actuator.

[0021] Furthermore, the controller is pre-set with a set pressure, and when the outlet pressure of the regulating valve is the same as or close to the set pressure, the opening of the regulating valve is kept unchanged.

[0022] Furthermore, the actuators inside the valve body are all made of metal material.

[0023] Furthermore, a plurality of sealing rings are provided at the contact parts between the valve body and each element.

[0024] Furthermore, a plurality of small holes are evenly arranged on the valve cage.

[0025] The beneficial effects of the utility model are as follows: by fixing the valve stem and the valve cylinder, the valve stem moves in the vertical direction, and the guide rod also moves accordingly in the horizontal direction, and the guide rod drives the valve cylinder to move together. When the outlet pressure of the regulating valve is less than the set pressure, the valve stem moves upward, and the guide rod and the valve cylinder move to the right together; when the outlet pressure of the regulating valve is greater than the set pressure, the valve stem moves downward, and the guide rod and the valve cylinder move to the left together, reducing the opening of the regulating valve, thereby reducing the flow or pressure of natural gas; when the valve cylinder is opened, natural gas will flow from the balancing chamber into the medium chamber; when the valve cylinder is closed, natural gas will flow from the medium chamber into the balancing chamber through the vent hole, so as to keep the inlet and outlet pressure difference from being too large, so as to achieve the purpose of balancing the pressure difference, improve the response speed of the valve switch, reduce the input torque, save costs, and increase the service life of the regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the structure of a regulating valve with a balanced valve core structure;

[0028] Figure 2 It is a side view of a regulating valve with a balanced valve core structure;

[0029] Figure 3 It is a schematic diagram of the cylinder cover structure;

[0030] Figure 4 It is a cross-sectional view of the cylinder cover along AA;

[0031] Figure numerals: 1, valve body; 11, valve stem; 12, guide rod; 13, valve cage; 14, first cavity; 15, second cavity; 16, balance cavity; 17, medium cavity; 18, valve cylinder; 181, cylinder cover; 181A, vent; 2, valve seat; 3, actuator; 4, sealing ring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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 communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figures 1 to 4 As shown, a regulating valve with a balanced valve core structure includes:

[0036] A valve body 1, the valve body 1 comprises a valve stem 11, a guide rod 12 and a valve cage 13;

[0037] The valve body 1 is provided with a first cavity 14 in the vertical direction, and the valve stem 11 is arranged in the first cavity 14, and the valve stem 11 can reciprocate in the vertical direction;

[0038] The valve body 1 is provided with a second cavity 15 in the horizontal direction, and the guide rod 12 is arranged in the second cavity 15, and the guide rod 12 can reciprocate in the horizontal direction;

[0039] A plurality of balancing chambers 16 and medium chambers 17 are arranged inside the valve body 1 along the axisymmetric direction;

[0040] The valve cage 13 is arranged at the junction of the balancing chamber 16 and the medium chamber 17, and a valve cylinder 18 is arranged at one end of the valve cage 13 close to the balancing chamber 16;

[0041] The valve cylinder 18 is fixedly connected to the valve stem 11, and the valve cylinder 18 can reciprocate in the horizontal direction;

[0042] The valve cylinder 18 is provided with a cylinder cover 181, and a plurality of vent holes 181A are evenly arranged on the cylinder cover 181;

[0043] The valve seat 2 is fixedly arranged at one end of the valve body 1 .

[0044] By fixing the valve stem 11 and the valve cylinder 18, the valve stem 11 moves in the vertical direction, and the guide rod 12 also moves in the horizontal direction accordingly, and the guide rod 12 drives the valve cylinder 18 to move together. When the outlet pressure of the regulating valve is less than the set pressure, the valve stem 11 moves upward, and the guide rod 12 and the valve cylinder 18 move to the right together; when the outlet pressure of the regulating valve is greater than the set pressure, the valve stem 11 moves downward, and the guide rod 12 and the valve cylinder 18 move to the left together, reducing the opening of the regulating valve, thereby reducing the flow or pressure of natural gas; when the valve cylinder 18 is opened, natural gas will flow from the balance chamber 16 into the medium chamber 17; when the valve cylinder 18 is closed, natural gas will flow from the medium chamber 17 into the balance chamber 16 through the vent hole 181A, so as to keep the inlet and outlet pressure difference from being too large, so as to achieve the purpose of balancing the pressure difference, improve the response speed of the valve switch, reduce the input torque, save costs, and increase the service life of the regulating valve.

[0045] In this embodiment, the ventilation holes 181A are configured as round waist holes evenly distributed along the circumferential direction.

[0046] By setting the vent holes 181A as round waist holes evenly distributed along the circumferential direction, the natural gas can flow more smoothly, improving the effect of balancing the pressure difference. The design of the round waist holes also further improves the appearance of the cylinder cover 181, making the cylinder cover 181 appear more beautiful and generous.

[0047] In this embodiment, an actuator 3 is fixedly disposed above the first cavity 14 , and the actuator 3 is fixedly connected to the valve stem 11 .

[0048] The actuator 3 is fixedly connected to the valve stem 11, and the valve stem 11 is driven to move by the actuator 3, thereby increasing the response speed of the movement of the valve stem 11, reducing the control error of the movement of the valve stem 11, and ensuring the stable and reliable operation of the regulating valve.

[0049] In this embodiment, the actuator 3 relies on the controller to change its motion state;

[0050] The controller changes the output current through PID calculation to realize the movement of the actuator 3.

[0051] The controller can achieve precise control of the actuator 3 through PID calculation, so that the actuator 3 can move to the specified position accurately and stably. The output current of the controller based on PID calculation can be continuously corrected according to the system error, ensuring the stable state of the actuator 3 during the movement process and improving the response speed and efficiency of the actuator 3.

[0052] In this embodiment, the controller is pre-set with a set pressure, and when the outlet pressure of the regulating valve is the same as or close to the set pressure, the opening of the regulating valve is kept unchanged.

[0053] When the outlet pressure of the regulating valve is stable, the regulating valve will no longer be adjusted, which further reduces energy consumption. At the same time, the opening of the regulating valve remains unchanged, which can also improve the stability of the regulating valve.

[0054] In this embodiment, the actuators inside the valve body 1 are all made of metal material.

[0055] The actuators inside the valve body 1 are all made of metal materials. Metal materials have high strength and hardness, so that the mechanical components can withstand large mechanical loads. Metal materials also have good wear resistance, ensuring that the actuators have good performance during long-term use, reducing the failure rate of the control valve and increasing the service life of the control valve.

[0056] In this embodiment, a plurality of sealing rings 4 are provided at the contact parts of the valve body 1 and the components.

[0057] A plurality of sealing rings 4 are arranged at the contact parts between the valve body 1 and the components. The sealing rings 4 can prevent the leakage of natural gas and improve the sealing effect of the valve. Meanwhile, the sealing rings 4 can also reduce vibration and noise, and further ensure the stability of the operation of the regulating valve.

[0058] In this embodiment, a plurality of small holes are evenly arranged on the valve cage 13 .

[0059] The cage 13 is provided with a number of small holes, through which the natural gas will flow in and out of the balancing chamber 16 and the medium chamber 17. The provision of the small holes limits the flow rate of the natural gas through the cage 13, reduces the fluctuation caused by the large flow of natural gas, slowly balances the inlet and outlet pressure difference, and improves the stability of the regulating valve.

[0060] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A regulating valve with a balanced valve core structure, characterized in that: include: A valve body, the valve body comprising a valve stem, a guide rod and a valve cage; The valve body is provided with a first cavity along the vertical direction, the valve stem is arranged in the first cavity, and the valve stem can reciprocate along the vertical direction; The valve body is provided with a second cavity along the horizontal direction, the guide rod is arranged in the second cavity, and the guide rod can reciprocate along the horizontal direction; A plurality of balancing chambers and medium chambers are arranged inside the valve body along the axisymmetric direction; The valve cage is arranged at the junction of the balancing chamber and the medium chamber, and a valve cylinder is arranged at one end of the valve cage close to the balancing chamber; Wherein, the valve cylinder is fixedly connected to the valve stem, and the valve cylinder can reciprocate in the horizontal direction; The valve cylinder is provided with a cylinder cover, and the cylinder cover is evenly provided with a plurality of vent holes; A valve seat is fixedly arranged at one end of the valve body.

2. The regulating valve with a balanced valve core structure according to claim 1, characterized in that: The vent holes are arranged as round waist holes evenly distributed along the circumferential direction.

3. The regulating valve with a balanced valve core structure according to claim 1, characterized in that: An actuator is fixedly arranged above the first cavity, and the actuator is fixedly connected to the valve stem.

4. The regulating valve with a balanced valve core structure according to claim 3, characterized in that: The actuator changes its motion state by relying on the controller; The controller changes the output current through PID calculation to achieve the movement of the actuator.

5. The regulating valve with a balanced valve core structure according to claim 4, characterized in that: The controller is pre-set with a set pressure, and when the outlet pressure of the regulating valve is the same as or close to the set pressure, the opening of the regulating valve is kept unchanged.

6. The regulating valve with a balanced valve core structure according to claim 1, characterized in that: The actuators inside the valve body are all made of metal material.

7. The regulating valve with a balanced valve core structure according to claim 6, characterized in that: The contact parts between the valve body and each element are provided with a plurality of sealing rings.

8. The regulating valve with a balanced valve core structure according to claim 1, characterized in that: A plurality of small holes are evenly arranged on the valve cage.

Images