Valve core of recoil type balance valve

Abstract

The utility model relates to the technical field of balance valves, in particular to a recoil type balance valve element which comprises a T-shaped fixing rod, a T-shaped guide cylinder and a sealing ring, the T-shaped fixing rod, the T-shaped guide cylinder and the sealing ring are coaxially arranged, the T-shaped guide cylinder is sleeved outside the T-shaped fixing rod, and the sealing ring is arranged between the T-shaped fixing rod and the T-shaped guide cylinder. The T-shaped fixing rod comprises a fixing disc and a fixing threaded rod which are coaxially and fixedly connected, and the fixing holes are located in the periphery of the fixing threaded rod. Through the staggered design of the fixing holes and the guide holes in the circumferential direction, fluid is forced to vertically impact a hole-free area of the guide disc, downward reaction component force is generated, the component force and high pressure formed by closing the valve clack are synergistic and cooperated, and recoil assisting force is generated and transmitted to the T-shaped guide cylinder; and the medium impact force, the friction of the guide sleeve and the compression resistance of the sealing ring are overcome together with the manual operation force, so that the effect of low-torque quick closing is realized.

Description

Technical Field

[0001] This utility model relates to the field of balance valve technology, and more specifically to a backwash balance valve core. Background Technology

[0002] As a key component in hydraulic and water systems for achieving precise flow control and pressure balance, the balancing valve's core function is to regulate the flow capacity of the medium in the pipeline to meet system requirements. A traditional balancing valve mainly consists of a valve body, valve core, valve stem, valve disc fitted into the valve body, and sealing elements (such as sealing rings) (see structural diagram). Figure 4 Its working principle is as follows: the operator rotates the handwheel to drive the valve stem, which drives the valve core to move along the axial direction (usually upward) in the valve body cavity. The valve disc and the valve core adopt a precision guide sleeve fit design to ensure the axial guiding accuracy of the valve core movement. When the valve core moves upward, an axial direct flow channel is formed between its outer wall and the inner wall of the valve body cavity. The sealing ring disengages from the mating surface to release the seal and allow the medium to flow.

[0003] However, the aforementioned traditional balancing valves have obvious defects, namely the asymmetry of operating torque: since the mainstream of the medium flows axially, when opening, the fluid dynamics generate an upward auxiliary force (the valve core is generally designed to be in a closed state), which significantly reduces the opening operating torque (easy to open); but when closing, the downward fluid dynamic pressure (resisting the closing movement), the frictional resistance of the guide sleeve, the sealing pre-tightening force, and the potential water hammer effect work together to cause a significant increase in the closing operating torque (difficult to close). This inherent defect limits the performance of the valve in scenarios that require frequent closing or manual operation. Therefore, this utility model provides a backwash balancing valve core that can be easily closed. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that traditional balance valves are difficult to close, and to provide a backwash balance valve core that can be easily closed.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] This utility model proposes a backwash-type balance valve core, including a T-shaped fixing rod arranged coaxially, a T-shaped guide cylinder sleeved outside the T-shaped fixing rod, and a sealing ring disposed between the T-shaped fixing rod and the T-shaped guide cylinder;

[0007] The T-shaped fixing rod includes a fixing disc and a fixing threaded rod that are coaxially fixed together, and the fixing hole is located on the periphery of the fixing threaded rod;

[0008] The T-shaped guide cylinder includes a guide disk and a straight guide cylinder that are coaxially fixed together and pass through the straight guide cylinder;

[0009] The fixed disk has several fixing holes along its circumference, and the guide disk has several guide holes along its circumference.

[0010] The fixing hole and the guide hole are misaligned, so that the fluid cannot directly pass through them to form a straight flow channel.

[0011] As a preferred embodiment of this utility model, the fixed disc has a threaded hole at its center, and the fixed threaded rod is threadedly connected to the threaded hole.

[0012] As a preferred embodiment of this utility model, a hollow guide rod is connected to the end of the straight guide cylinder. The hollow guide rod is coaxially connected to the threaded hole and is used to connect an external valve stem.

[0013] In a preferred embodiment of this invention, the diameter of the fixed disk is smaller than the diameter of the guide disk.

[0014] In a preferred embodiment of this invention, the diameter of the fixed disc is larger than the diameter of the fixed threaded rod; and the diameter of the guide disc is larger than the diameter of the straight guide cylinder.

[0015] As a preferred technical solution of this utility model, both the T-shaped fixing rod and the T-shaped guide cylinder are integrally cast from ductile iron.

[0016] In a preferred embodiment of this invention, the number of fixing holes is four and the number of guide holes is three.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention utilizes a circumferentially offset design between the fixing hole and the guide hole to force the fluid to vertically impact the non-perforated area of ​​the guide disc, generating a downward reaction force. This force, combined with the high pressure generated by the valve disc closure, creates a backflow assist that is transmitted to the T-shaped guide cylinder. This, along with the manual operating force, overcomes the impact force of the medium, the friction of the guide sleeve, and the compression resistance of the sealing ring, thereby achieving a low-torque, rapid closing effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first exploded structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the second explosive structure of this utility model;

[0021] Figure 3 This is a schematic diagram illustrating the working principle of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of a traditional balancing valve.

[0023] Reference numerals: 1-T-shaped fixing rod, 11-Fixing hole, 12-Fixing threaded rod, 13-Fixing disc, 2-T-shaped guide cylinder, 21-Guide hole, 22-Threaded hole, 23-Guide disc, 24-Straight guide cylinder, 25-Hollow guide rod, 3-Sealing ring. Detailed Implementation

[0024] Reference Figure 1 and Figure 2 As shown, this utility model proposes a backwash-type balance valve core, including a T-shaped fixing rod arranged coaxially, a T-shaped guide cylinder sleeved outside the T-shaped fixing rod, and a sealing ring disposed between the T-shaped fixing rod and the T-shaped guide cylinder;

[0025] The T-shaped fixing rod includes a fixing disc and a fixing threaded rod that are coaxially fixed together;

[0026] The T-shaped guide cylinder includes a guide disk and a straight guide cylinder that are coaxially fixed together;

[0027] The fixed disc has several fixing holes along its circumference, and the fixing holes are located on the periphery of the fixed threaded rod;

[0028] The guide disk has several guide holes along its circumference and passes through a straight guide cylinder.

[0029] The fixing hole and the guide hole are misaligned, so that the fluid cannot directly pass through them to form a straight flow channel.

[0030] The fixed disc has a threaded hole at its center, and the fixed threaded rod is threadedly connected to the threaded hole.

[0031] The straight guide cylinder is connected to a hollow guide rod at its end. The hollow guide rod is coaxially connected to the threaded hole and is used to connect to an external valve stem.

[0032] The diameter of the fixed disk is smaller than the diameter of the guide disk.

[0033] Wherein, the diameter of the fixed disc is greater than the diameter of the fixed threaded rod; the diameter of the guide disc is greater than the diameter of the straight guide cylinder.

[0034] The T-shaped fixing rod and the T-shaped guide cylinder are both integrally cast from ductile iron.

[0035] The number of fixing holes is four, and the number of guide holes is three.

[0036] Working principle:

[0037] When the operator rotates the handwheel to drive the valve stem to move axially downward, the hollow guide rod connected to the valve stem drives the T-shaped guide cylinder to move downward as a whole. At this time, the valve disc inserted at the bottom of the valve body remains in a closed state, forming a flow channel end blockage. During the valve core closing stroke:

[0038] The medium flows in along the valve body axially and first passes through the circumferential fixing hole opened on the fixing disc of the T-shaped fixing rod;

[0039] Because the fixing hole and the guide hole on the guide disk of the T-shaped guide cylinder are circumferentially misaligned, the fluid cannot pass through directly;

[0040] The main force is forced to vertically impact the non-perforated solid area (non-guide hole position) of the guide disk, generating a vertical outward reaction force.

[0041] The axial component of the reaction force is downward and in the same direction as the valve core's closing motion.

[0042] At the same time, the valve disc closure creates a high-pressure zone at the bottom of the straight guide cylinder, enhancing the upward impulse energy of the fluid;

[0043] This recoil force is transmitted to the entire T-shaped guide cylinder through the guide disc, and combined with the mechanical force applied by the operator, they work together to overcome the positive impact force of the medium flowing in through the fixed hole, the friction between the T-shaped guide cylinder and the valve disc guide sleeve, and the compression deformation resistance of the sealing ring, thereby achieving the effect of low torque and rapid closure.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A recoil-type balance valve core, characterized in that: It includes a T-shaped fixing rod (1) coaxially arranged, a T-shaped guide cylinder (2) sleeved on the outside of the T-shaped fixing rod (1), and a sealing ring (3) disposed between the T-shaped fixing rod (1) and the T-shaped guide cylinder (2); The T-shaped fixing rod (1) includes a fixed disc (13) and a fixed threaded rod (12) that are coaxially fixed. The T-shaped guide cylinder (2) includes a guide disk (23) and a straight guide cylinder (24) that are coaxially fixed together. The fixed disc (13) has several fixing holes (11) along its circumference, and the fixing holes (11) are located on the periphery of the fixed threaded rod (12). The guide disk (23) has several guide holes (21) along its circumference and passes through a straight guide cylinder (24). The fixing hole (11) and the guide hole (21) are offset.

2. The valve core of a backwash-type balance valve according to claim 1, characterized in that: The fixed disc (13) has a threaded hole (22) at its center, and the fixed threaded rod (12) is threadedly connected to the threaded hole (22).

3. The valve core of a backwash-type balance valve according to claim 1, characterized in that: The straight guide cylinder (24) is connected to a hollow guide rod (25) at its end. The hollow guide rod (25) is coaxially connected to the threaded hole (22) and is used to connect to an external valve stem.

4. The valve core of a backwash-type balance valve according to claim 1, characterized in that: The diameter of the fixed disk (13) is smaller than the diameter of the guide disk (23).

5. The valve core of a backwash-type balance valve according to claim 1, characterized in that: The diameter of the fixed disc (13) is greater than the diameter of the fixed threaded rod (12); the diameter of the guide disc (23) is greater than the diameter of the straight guide cylinder (24).

6. The valve core of a backwash-type balance valve according to claim 1, characterized in that: Both the T-shaped fixing rod (1) and the T-shaped guide cylinder (2) are integrally cast from ductile iron.

7. The valve core of a backwash-type balance valve according to claim 1, characterized in that: The number of fixing holes (11) is four, and the number of guide holes (21) is three.

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