Differential pressure controller of dynamic flow control valve

Abstract

The utility model discloses a dynamic flow control valve differential pressure controller which comprises a valve body assembly, a valve bonnet assembly and a differential pressure controller assembly, the differential pressure controller assembly comprises a support, a piston, a diaphragm, a piston cover, a sealing ring, a valve bonnet, a guide shaft and a spring, the support is arranged above the piston, the piston comprises a piston body, a hole groove is formed in the piston body, and the diaphragm is arranged in the hole groove. A guide rib is fixedly arranged on the inner side of the hole groove, a pressure guiding groove is formed in one end of the hole groove, a valve cover is arranged below the piston, a diaphragm and a piston cover are arranged between the piston and the valve cover, a sealing ring is arranged on the side of the valve cover, a guide shaft is arranged in the hole groove, and a spring is arranged in the piston. The control valve provided by the utility model can effectively solve the problem of on-line flow regulation; meanwhile, the valve is in a control signal range, and the control flow is continuous; the preset flow of the valve flow is stable, and the situation that differential pressure control is inconsistent due to the fact that the differential pressure increasing and decreasing movement directions are inconsistent is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of control valve equipment in a heating, ventilation and air conditioning system, in particular to a dynamic flow control valve pressure difference controller. Background Art

[0002] Serious hydraulic imbalance often occurs in HVAC water systems, which directly leads to poor system operation and high energy consumption. The usual solution is to perform hydraulic balance calculations in the design to minimize or eliminate hydraulic imbalance; however, due to various reasons, the system often has an imbalance phenomenon in which the proximal resistance coefficient cannot reach the ideal design state and the proximal flow is too large and the distal flow is insufficient; if the system needs to achieve comprehensive hydraulic balance, then the most economical and effective solution is to use static and dynamic balancing valves in the system to adjust the hydraulic balance, because the dynamic flow balancing valve can automatically change the resistance coefficient according to the pressure difference of the system working fluid without the help of external energy.

[0003] The dynamic flow balancing valve in the prior art has the following defects: there is an O-ring seal between the pressure differential controller and the valve stem; when the pressure differential before and after the valve increases, the opening between the pressure differential control piston and the valve body decreases, and the friction force generated by the O-ring between the piston and the valve stem increases between the piston and the valve body; when the pressure differential before and after the valve decreases, the opening between the pressure differential control piston and the valve body increases, and the friction force generated by the O-ring between the piston and the valve stem decreases between the piston and the valve body; in this way, the difference between the friction force when the pressure differential increases and decreases is twice the friction force; therefore, the control difference of the pressure differential of the pressure differential controller when the pressure differential before and after the valve increases and decreases is the spring force minus twice the friction force divided by the diaphragm area; and due to the different pressure differential control, the flow control produces different flow rates when the pressure before and after the valve increases or decreases. Utility Model Content

[0004] The utility model aims to provide a dynamic flow control valve pressure difference controller in order to solve the existing problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a dynamic flow control valve differential pressure controller, comprising: a valve body assembly, a valve cap assembly and a differential pressure controller assembly, the differential pressure controller assembly comprising: a bracket, a piston, a diaphragm, a piston cover, a sealing ring, a valve cover, a guide shaft and a spring, a bracket is arranged above the piston, the piston comprises a piston body, a hole groove is opened inside the piston body, a guide rib is fixedly arranged on the inner side of the hole groove, a pressure-guiding groove is opened at one end of the hole groove, a valve cover is arranged below the piston, a diaphragm and a piston cover are arranged between the piston and the valve cover, a sealing ring is arranged on the side of the valve cover, a guide shaft is arranged inside the hole groove, and a spring is arranged inside the piston.

[0006] As a further solution of the utility model: the bracket includes a bracket body, a window is opened on the top of the bracket body, a center hole is opened in the middle of the bottom of the bracket body, and a support column is arranged in the middle of the bracket body.

[0007] As a further solution of the utility model: the valve cover includes a valve cover body, an end face is arranged on the upper part of the valve cover body, a connecting hole is arranged in the middle of the valve cover body, a central cavity is arranged outside the connecting hole in the valve cover body, and a pressure-inducing hole is opened on the outer side wall of the valve cover body.

[0008] As a further solution of the utility model: the bracket is provided with an opening, the spring is in a pre-compressed state, the piston is fixedly arranged on the guide shaft on the valve cover through a sleeve with an opening, and the valve cover is sealed with the valve body assembly through a sealing ring.

[0009] As a further solution of the utility model: the piston and the piston cover are divided into two independent pressure chambers by a diaphragm in the lower area of ​​the valve body assembly. The piston is placed inside the valve body assembly and can move axially through the guide shaft through the balance of pressure and spring force, so as to adjust the size of the opening between the piston and the valve body assembly in the axial direction.

[0010] As a further solution of the utility model: the valve body assembly 100 is provided with four groups of openings, the valve cap assembly 200 and the pressure difference controller assembly 300 are respectively arranged at the upper and lower parts of the openings, the other two openings of the valve body assembly 100 are used to connect water supply and drainage pipes, and the guide shaft 370 is fixedly connected to the valve cover 360.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The control valve in the utility model can effectively solve the function of online flow regulation; at the same time, the valve controls the flow continuously within the control signal range; the valve flow preset flow is stable, and the pressure difference control will not be inconsistent due to the inconsistent movement direction of the pressure difference increase and decrease. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of a dynamic flow control valve pressure difference controller described in the utility model;

[0014] Figure 2 It is a structural schematic diagram of a differential pressure controller component in a differential pressure controller for a dynamic flow control valve described in the utility model;

[0015] Figure 3 It is a structural schematic diagram of a bracket in a pressure differential controller of a dynamic flow control valve described in the utility model;

[0016] Figure 4 It is a structural schematic diagram of a piston in a pressure differential controller of a dynamic flow control valve described in the utility model;

[0017] Figure 5 It is a structural schematic diagram of a valve cover in a pressure differential controller of a dynamic flow control valve described in the utility model.

[0018] In the figure: 100, valve body assembly; 200, valve cap assembly; 300, pressure difference controller assembly; 310, bracket; 311, support column; 313, center hole; 312 window; 320, piston; 321, guide rib; 322, pressure guide groove; 330, diaphragm; 340, piston cover; 350, sealing ring; 360, valve cover; 361, end face; 362, connecting hole; 363, center cavity; 364, pressure guide hole; 370, guide shaft; 380, spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following is an explanation of the embodiments of the present utility model based on the overall structure of the present utility model.

[0021] Reference Figures 1 to 5In an embodiment of the utility model, a dynamic flow control valve pressure difference controller includes: a valve body assembly 100, a valve cap assembly 200 and a pressure difference controller assembly 300, the pressure difference controller assembly 300 includes: a bracket 310, a piston 320, a diaphragm 330, a piston cover 340, a sealing ring 350, a valve cover 360, a guide shaft 370 and a spring 380, a bracket 310 is arranged above the piston 320, the piston 320 includes a piston body, a hole groove is opened inside the piston body, a guide rib 321 is fixed inside the hole groove, a pressure guide groove 322 is opened at one end of the hole groove, a valve cover 360 is arranged below the piston 320, a diaphragm 330 and a piston cover 340 are arranged between the piston 320 and the valve cover 360, a sealing ring 350 is arranged on the side of the valve cover 360, a guide shaft 370 is arranged inside the hole groove, and a spring 380 is arranged inside the piston 320.

[0022] The bracket 310 includes a bracket body, a window 312 is formed on the upper part of the bracket body, a center hole 313 is formed in the middle of the lower part of the bracket body, and a support column 311 is disposed in the middle of the bracket body.

[0023] The valve cover 360 includes a valve cover body, an end surface 361 is arranged on the upper part of the valve cover body, a connecting hole 362 is arranged in the middle of the valve cover body, a central cavity 363 is arranged outside the connecting hole 362 inside the valve cover body, and a pressure-inducing hole 364 is opened on the outer wall of the valve cover body.

[0024] The bracket 310 is provided with an opening, the spring 380 is in a pre-compressed state, the piston 320 is fixedly disposed on the guide shaft 370 on the valve cover 360 through a sleeve with an opening, and the valve cover 360 is sealed with the valve body assembly 100 through a sealing ring 350 .

[0025] The piston 320 and the piston cover 340 are separated into two independent pressure chambers by a diaphragm 330, and the piston 320 is placed inside the valve body assembly 100 and can move axially through the guide shaft 370 by balancing the pressure and the force of the spring 380, thereby adjusting the size of the opening between the piston 320 and the valve body assembly 100 in the axial direction.

[0026] The valve body assembly 100 is provided with four groups of openings, the valve cap assembly 200 and the pressure difference controller assembly 300 are respectively arranged at the upper and lower parts of the openings, the other two openings of the valve body assembly 100 are used to connect water supply and drainage pipes, and the guide shaft 370 is fixedly connected to the valve cover 360.

[0027] The working principle of the utility model is: the bracket 310 is provided with an opening, the spring 380 is in a pre-compressed state, the piston 320 is fixedly arranged on the guide shaft 370 on the valve cover 360 through a sleeve with an opening, and the valve cover 360 is sealed with the valve body assembly 100 through a sealing ring 350, and the piston 320 and the piston cover 340 are divided into two independent pressure chambers by a diaphragm 330 in the lower area of ​​the valve body assembly 100, and the piston 320 is placed inside the valve body assembly 100 and can make axial movement in the axial direction through the guide shaft 370 through the balance of pressure and the force of the spring 380, and the size of the opening between the piston 320 and the valve body assembly 100 is adjusted in the axial direction, and the valve controls the flow continuously within the control signal range; the valve flow preset flow is stable, and the pressure difference control will not be inconsistent due to the inconsistent movement direction of the pressure difference increase and decrease.

[0028] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dynamic flow control valve pressure differential controller, characterized in that: include: A valve body assembly (100), a valve cap assembly (200) and a differential pressure controller assembly (300), wherein the differential pressure controller assembly (300) comprises: a bracket (310), a piston (320), a diaphragm (330), a piston cover (340), a sealing ring (350), a valve cover (360), a guide shaft (370) and a spring (380), wherein the bracket (310) is arranged above the piston (320), and the piston (320) comprises a piston body, wherein the piston body A hole groove is provided on the inner side of the hole groove, a guide rib (321) is fixedly provided on the inner side of the hole groove, a pressure guide groove (322) is provided on one end of the hole groove, a valve cover (360) is provided below the piston (320), a diaphragm (330) and a piston cover (340) are provided between the piston (320) and the valve cover (360), a sealing ring (350) is provided on the side of the valve cover (360), a guide shaft (370) is provided inside the hole groove, and a spring (380) is provided inside the piston (320).

2. A dynamic flow control valve pressure difference controller according to claim 1, characterized in that: The bracket (310) comprises a bracket body, a window (312) is provided on the top of the bracket body, a center hole (313) is provided in the middle of the bottom of the bracket body, and a support column (311) is provided in the middle of the bracket body.

3. A dynamic flow control valve pressure difference controller according to claim 1, characterized in that: The valve cover (360) includes a valve cover body, an end surface (361) is arranged on the upper part of the valve cover body, a connecting hole (362) is arranged in the middle of the valve cover body, a central cavity (363) is arranged outside the connecting hole (362) inside the valve cover body, and a pressure-inducing hole (364) is opened on the outer wall of the valve cover body.

4. A dynamic flow control valve pressure difference controller according to claim 1, characterized in that: The bracket (310) is provided with an opening, the spring (380) is in a pre-compressed state, the piston (320) is fixedly arranged on a guide shaft (370) on the valve cover (360) via a sleeve with an opening, and the valve cover (360) is sealed with the valve body assembly (100) via a sealing ring (350).

5. The dynamic flow control valve pressure difference controller according to claim 1, characterized in that: The piston (320) and the piston cover (340) are separated into two independent pressure chambers by a diaphragm (330) to separate the lower area of ​​the valve body assembly (100). The piston (320) is placed inside the valve body assembly (100) and can move axially through the guide shaft (370) by balancing the pressure and the force of the spring (380), thereby adjusting the size of the opening between the piston (320) and the valve body assembly (100) in the axial direction.

6. A dynamic flow control valve pressure difference controller according to claim 1, characterized in that: The valve body assembly (100) is provided with four groups of openings, the valve cap assembly (200) and the pressure difference controller assembly (300) are respectively arranged at the upper and lower parts of the openings, the other two openings of the valve body assembly (100) are used to connect water supply and drainage pipes, and the guide shaft (370) is fixedly connected to the valve cover (360).

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