Small-caliber wedge-type double-gate-plate gate valve gate plate

Abstract

A small-caliber wedge type double-gate-plate gate valve gate plate comprises a left gate plate, a right gate plate and a gate plate middle body, the inner side of the left gate plate and the inner side of the right gate plate are designed to be of a mortise structure, protruding blocks are symmetrically arranged on the outer edge of a mortise, and a disc spring is assembled in the mortise. Protruding blocks are symmetrically arranged on the inner side of a center hole of the flashboard middle body, grooves are formed between the protruding blocks in the axial direction, and the protruding blocks are buckled with the grooves so that the left flashboard, the right flashboard and the flashboard middle body can be connected into a whole. The flashboard guide sleeve is installed in a center hole of the flashboard middle body, and the outer side face of the flashboard guide sleeve makes contact with the disc spring. The whole flashboard is divided into the left flashboard, the right flashboard and the flashboard middle body, the left flashboard, the right flashboard and the flashboard middle body adjust the machining angle gap of the flashboard gate valve body and the gear width of the combined flashboard under the action of pretightening force of the belleville spring, so that the flashboard enters the sealing face of the valve body and makes contact with the sealing face of the valve body, and the sealing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of valve manufacturing, and in particular to a small-caliber wedge-type double-disc gate valve gate. Background Art

[0002] For small-diameter wedge-type gate valves, since small-diameter gates are all rigid gates, the rigid gates are single-piece solid structures. When closed, they mainly play a forced sealing role and cannot compensate for the change in valve seat centering caused by pipeline load or thermal fluctuations. The wedge half-angle machining accuracy of the sealing surfaces on both sides is very high, and manufacturing and maintenance are relatively difficult. The seals are prone to wear during operation, and the gate is prone to being wedged when the temperature changes. Rigid gate structure such as Figure 6 shown.

[0003] Since the gate of a small-diameter wedge-type gate valve is an integral whole without elastic deformation, there is an angle error between the gate and the valve body sealing surface wedge angle during processing, forming a gap between the two and causing valve seal leakage. This leakage is difficult to grasp and control based on the operator's practical experience in processing engineering. Summary of the invention

[0004] The present invention provides a small-caliber wedge-type double-disc gate valve, which contacts the disc spring through the outer side of the gate guide sleeve. The left and right gates and the gate middle body adjust the size of the combined gate width under the preload of the butterfly spring so that the gate enters the valve body sealing surface and contacts the valve body sealing surface to achieve a sealing effect.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A small-caliber wedge-type double-disc gate valve gate comprises left and right gate plates and a gate plate middle body. The inner sides of the left and right gate plates are designed as a mortise and tenon structure, and protrusions are symmetrically arranged on the outer edges of the mortise, and disc springs are installed in the mortise; protrusions are symmetrically arranged on the inner side of the center hole of the gate plate middle body, and grooves are formed axially between the protrusions. The protrusions are buckled with the grooves to connect the left and right gate plates and the gate plate middle body as a whole; the gate plate guide sleeve is installed in the center hole of the gate plate middle body, and the outer side surface of the gate plate guide sleeve is in contact with the disc spring.

[0006] A rotation limiting pin is arranged in the groove.

[0007] After the gate middle body and the gate guide sleeve are assembled, the end faces of the two form an integral 5° inclined surface.

[0008] The gate guide sleeve is composed of a fixed core shaft at the upper end and a body at the lower end, and a guide sleeve hole is opened on the body; the fixed core shaft passes through the upper hole of the gate body and is tightly matched with the fixed core shaft hole on the lower end surface of the valve stem.

[0009] The lower end of the valve stem is provided with an external thread. After the external thread and the upper hole thread of the gate body are assembled, the positioning pin passes through the positioning hole at the lower end of the valve stem and the positioning hole on the gate body to connect the two; the positioning hole is located above the bottom of the fixed core shaft hole.

[0010] The present invention decomposes the whole gate into left and right gates and a gate body. The left and right gates and the gate body adjust the machining angle clearance of the gate valve body and the width of the combined gate under the preload of the butterfly spring so that the gate enters the valve body sealing surface and contacts the valve body sealing surface to achieve a sealing effect. Moreover, when the temperature changes, due to the preload of the butterfly spring, the gate will not be wedged due to the temperature change. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the middle body of the utility gate; Figure 3 This is a schematic diagram of the structure of the left and right gate plates in this practical application; Figure 4 This is a schematic diagram of the structure of the gate guide sleeve of this utility model; Figure 5 This is a schematic diagram of the local structure of the valve stem of this utility model; Figure 6 It is a structural schematic diagram of an existing rigid gate. DETAILED DESCRIPTION

[0012] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] Reference Figure 1-5 , A small-caliber wedge-type double-disc gate valve gate, comprising left and right gates 1 and a gate body 2. The inner sides of the left and right gates 1 are designed as a mortise and tenon structure, and the outer edges of the mortise are symmetrically provided with protrusions 1-1, in which a disc spring 3 is installed; the center hole of the gate body 2 is symmetrically provided with protrusions toward the inside, and a groove 2-2 is formed between the protrusions axially, and the protrusions 1-1 are buckled with the groove 2-2 (the protrusions 1-1 enter from the gap formed between the protrusions on the inner side of the center hole of the gate body 2 and then are rotated and buckled in the groove 2-2) to buckle the left and right gates 1 and the gate body 2 into one; the gate guide sleeve 5 is installed in the center hole of the gate body 2, and the outer side of the gate guide sleeve 5 is in contact with the disc spring 3.

[0014] The convex surface of the tenon groove of the left and right gate plates 1 extends to the inner hole 5-2 of the gate plate guide sleeve to play a guiding role.

[0015] The left and right gates 1 and the gate body 2 are adjusted under the preload of the butterfly spring 3 so that the gate enters the valve body sealing surface and contacts the valve body sealing surface to achieve a sealing effect. When the gate sealing surface is worn, a gasket can be added to the mortise and tenon to compensate for it, which is convenient for maintenance.

[0016] The groove 2-2 is provided with a rotation limiting pin 2-3 to prevent the protrusions 1-1 on the left and right gate plates 1 from exceeding the groove 2-2 during rotational engagement and withdrawing from the gaps between the protrusions in the gate plate body 2.

[0017] After the gate middle body 2 and the gate guide sleeve 5 are assembled, the end faces of the two form an integral 5° inclined surface. The 5° inclined surface of the gate middle body and the gate guide sleeve is used to connect the left and right gates 1 to form a wedge gate.

[0018] The gate guide sleeve 5 is composed of a fixed core shaft 5-1 at the upper end and a body at the lower part, and a guide sleeve hole 5-2 is opened on the body; the fixed core shaft 5-1 passes through the upper hole 2-1 of the gate middle body 2 and is tightly matched with the fixed core shaft hole 6-2 on the lower end surface of the valve stem 6. It is ensured that the fixed gate guide sleeve 5, the gate middle body 2 and the valve stem 6 are coaxial.

[0019] The lower end of the valve stem 6 is provided with an external thread, and after the external thread and the upper hole 2-1 of the gate body 2 are threadedly matched, the positioning pin 4 passes through the positioning hole 6-1 at the lower end of the valve stem 6 and the positioning hole 2-4 on the gate body 2 to connect the two; the positioning hole 6-1 is located above the bottom of the fixed core shaft hole 6-2. This prevents the valve stem from rotating without lifting the gate, making the valve switch function ineffective.

Claims

1. A small-caliber wedge-type double-disc gate valve gate, comprising left and right gates (1) and a gate middle body (2), characterized in that: The inner sides of the left and right gate plates (1) are designed as a mortise and tenon structure, and the outer edges of the mortise are symmetrically provided with protrusions (1-1), and the mortise is equipped with a disc spring (3); the center hole of the gate body (2) is symmetrically provided with protrusions toward the inside, and a groove (2-2) is formed between the protrusions in the axial direction, and the protrusions (1-1) are buckled with the groove (2-2) to connect the left and right gate plates (1) and the gate body (2) as a whole; the gate guide sleeve (5) is installed in the center hole of the gate body (2), and the outer side surface of the gate guide sleeve (5) is in contact with the disc spring (3).

2. A small-caliber wedge-type double-disc gate valve gate according to claim 1, characterized in that: A rotation limiting pin (2-3) is provided in the groove (2-2).

3. A small-caliber wedge-type double-disc gate valve gate according to claim 1, characterized in that: After the gate plate middle body (2) and the gate plate guide sleeve (5) are assembled, the end surfaces of the two form an integral 5° inclined surface.

4. A small-caliber wedge-type double-disc gate valve gate according to claim 1, characterized in that: The gate plate guide sleeve (5) is composed of a fixed core shaft (5-1) at the upper end and a body at the lower end, and a guide sleeve hole (5-2) is opened on the body; the fixed core shaft (5-1) passes through the upper hole (2-1) of the gate plate middle body (2) and is tightly fitted with the fixed core shaft hole (6-2) on the lower end surface of the valve stem (6).

5. A small-caliber wedge-type double-disc gate valve gate according to claim 4, characterized in that: The lower end of the valve stem (6) is provided with an external thread. After the external thread and the upper hole (2-1) of the gate body (2) are threadedly assembled, a positioning pin (4) passes through the positioning hole (6-1) at the lower end of the valve stem (6) and the positioning hole (2-4) on the gate body (2) to connect the two. The positioning hole (6-1) is located above the bottom of the fixed core shaft hole (6-2).

Images