CN113309897B

CN113309897B - Case buffer structure

Info

Publication number: CN113309897B
Application number: CN202110860535.6A
Authority: CN
Inventors: 张三丽; 臧其刚; 陈梅
Original assignee: Pizhou Hongsheng Hydraulic Components Co ltd
Current assignee: Pizhou Hongsheng Hydraulic Components Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-10-01
Anticipated expiration: 2041-07-29
Also published as: CN113309897A

Abstract

The invention discloses a valve core buffering structure, and belongs to the technical field of control valves. Comprises a valve body, a valve core, a valve seat, a valve cover and a valve rod; the inner wall of the valve core hole of the valve body is provided with a throttling step, and the lower end of the throttling step is provided with a baffle table; the circumferential surface of the valve core is provided with a limiting step, and the valve core is sleeved with a spring and a floating sleeve; a shaft check ring for limiting the floating sleeve is arranged on the circumferential surface of the valve core; the inner surface of the throttling step is a conical surface; the outer surface of the floating sleeve is a conical surface, and the floating sleeve is axially opposite to the baffle table; the outer surface of the floating sleeve is provided with a diversion trench. In the process of opening and closing the valve core, a variable throttling channel is formed between the floating sleeve and the throttling step to buffer fluid impact; the buffer structure does not influence the normal movement of the valve core, the valve core is rigidly connected with the valve rod, and the position of the valve core is accurately controlled by an operator to control the flow of fluid.

Description

Case buffer structure

Technical Field

The invention relates to the technical field of control valves, in particular to a valve core buffering structure.

Background

The control valve is a control part in the fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like; control valves for fluid control systems range in variety and size from the simplest of globe valves to the various control valves used in extremely complex autonomous systems.

The valve core of the control valve is impacted by fluid in the opening and closing stage, and vibration and noise are easy to generate, so that the valve core is generally added with some buffer structures. For example, as shown in fig. 3, a novel noise reduction engine buffer valve core (CN 212959870U) disclosed in the chinese patent comprises a valve seat and a valve core, wherein the valve seat is cylindrical, a housing surrounds the side surface of the valve seat, a buffer chamber is arranged inside the housing, the bottom of the buffer chamber is communicated with the inside of an oil outlet pipe, the valve seat and the valve core are arranged at the bottom of the inside of the buffer chamber, a plurality of oil conduits are arranged inside the valve seat, a sliding groove is arranged at the middle part of the valve seat, the valve core is installed in the sliding groove, a sliding rod is arranged at the bottom of the valve core, a buffer groove is arranged inside the sliding rod, a buffer block is arranged at the top end of the sliding rod, a spring is arranged inside the buffer groove, a cushion block is arranged at the bottom end of the spring, the sliding rod is installed inside the sliding groove, the cushion block is installed at the bottom end of the inside of the sliding groove, a slide block is arranged at the bottom of the side surface of the sliding rod, a stop block connected with the valve seat is arranged at the top of the sliding groove, the buffer block moves downwards to reduce the flow rate of the buffer valve core, the cushion valve can realize the cushion function with a simpler structure.

Among the above-mentioned technique, through increasing the spring, set up the case to the floating condition to play the cushioning effect, its not enough that exists is: because the valve core can float, when the valve core is operated by the valve rod, the displacement of the valve rod does not correspond to the displacement of the valve core, so that the judgment of an operator is influenced, and when the fluid pressure is different, the strokes can be distinguished; the floating of the valve core is related to the elastic force of the spring and the fluid pressure, and the valve core is unstable, so that the reliability of the opening and closing state of the valve core and the stability of the flow rate cannot be ensured.

Disclosure of Invention

In order to solve the technical problem, the invention provides a valve core buffer structure, wherein a valve core main body and the buffer structure are arranged separately, so that the normal opening and closing stroke of a valve core is not influenced when the buffer structure works.

The invention adopts the following technical scheme: the invention provides a valve core buffer structure, which comprises a valve body, wherein an inlet pipeline and an outlet pipeline are arranged on the valve body; a valve core is arranged in a valve core hole of the valve body, a valve seat matched with the valve core is arranged on the inner wall of the valve core hole, and a valve cover is arranged at the upper end of the valve core hole; the valve core is connected with a valve rod, and the valve rod penetrates through the valve cover; the inner wall of the valve core hole of the valve body is provided with a throttling step, the lower end of the throttling step is provided with a baffle table, and the baffle table is positioned above the valve seat; the valve core is provided with a limiting step on the circumferential surface and is sleeved with a spring and a floating sleeve; the floating sleeve is positioned below the spring, and a shaft check ring for limiting the floating sleeve is arranged on the circumferential surface of the valve core; the inner surface of the throttling step is a conical surface; the outer surface of the floating sleeve is a conical surface, and the floating sleeve is axially opposite to the baffle table; the outer surface of the floating sleeve is provided with a diversion trench.

It further comprises the following steps: the baffle table is provided with a throttling hole which is communicated with the lower side surface of the baffle table and the inner side surface of the throttling step.

A stepped sinking groove is formed in the inner wall of the valve seat, and a sealing ring is arranged in the stepped sinking groove; the lower end of the valve core is a conical body, and the conical surface of the valve core is pressed on the upper end of the stepped sinking groove and the sealing ring.

The axis of the upper end surface of the valve core is provided with a threaded blind hole, and the lower end of the valve rod is connected and installed in the threaded blind hole at the upper end of the valve core through threads; and a lower fastening nut is arranged at the lower end of the valve rod and is tightly pressed on the upper end surface of the valve core.

The lower end of the valve rod is sleeved with an elastic cushion, the axis of the lower end of the elastic cushion is provided with a counter bore, and the lower fastening nut is positioned in the counter bore of the elastic cushion; an upper fastening nut which is installed on the valve rod through threaded connection is arranged above the elastic cushion and tightly pressed on the upper end face of the elastic cushion; the lower side surface of the valve cover is a plane, and a counter bore opposite to the upper fastening nut is formed in the lower side surface of the valve cover.

The valve rod is in threaded connection with the valve cover; the valve rod is a manual valve rod or an electric valve rod.

The invention has the beneficial effects that: in the opening and closing process of the valve core, fluid pushes the floating sleeve, a variable throttling channel is formed between the floating sleeve and the throttling step, and fluid impact is buffered; the buffering structure formed by the floating sleeve and the throttling step does not influence the normal movement of the valve core, and the valve core is rigidly connected with the valve rod, so that an operator can accurately control the position of the valve core and control the flow of fluid.

The stepped sinking groove is formed in the valve seat, the sealing ring is installed, the closed sealing performance of the valve core is improved, and the valve core leakage is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the closed configuration of the present invention.

Fig. 2 is a schematic structural diagram during the closing process of the present invention.

Fig. 3 is a damper valve cartridge of the type described in the background of the invention.

Description of reference numerals: 1. a valve body; 1-1, an inlet pipeline; 1-2, an outlet pipeline; 1-3, valve seats; 1-31, step sink; 1-4, blocking platform; 1-41, orifice; 1-5, a throttling step; 2. a valve core; 2-1, limiting steps; 3. a lower fastening nut; 4. tightening the nut; 5. a valve stem; 6. a valve cover; 7. a spring; 8. a retainer ring for a shaft; 9. a floating sleeve; 9-1, a diversion trench; 10. an elastic pad; 11. and (5) sealing rings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figures 1 and 2, in the valve core buffering structure, an inlet pipeline 1-1 and an outlet pipeline 1-2 are arranged on a valve body 1, and the valve body 1 is installed through the inlet pipeline 1-1 and the outlet pipeline 1-2. A valve core 2 is arranged in a valve core hole of the valve body 1, a valve seat 1-3 is arranged on the inner wall of the valve core hole, and the valve core 2 is matched with the valve seat 1-3. The upper end of the valve core hole is provided with a valve cover 6, the valve core 2 is connected with a valve rod 5, and the valve rod 5 penetrates through the valve cover 6. The valve rod 5 is in threaded connection with the valve cover 6, and the valve rod 5 is a manual valve rod or an electric valve rod. The valve rod 5 rotates to control the valve core 2 to move up and down.

The inner wall of the valve core hole of the valve body 1 is provided with throttling steps 1-5, and the inner surfaces of the throttling steps 1-5 are conical surfaces. The lower end of the throttling step 1-5 is provided with a baffle table 1-4, and the baffle table 1-4, the throttling step 1-5 and the valve body 1 are of an integrated structure. The baffle table 1-4 and the throttling step 1-5 are both positioned above the valve seat 1-3.

The circumferential surface of the valve core 2 is provided with a limit step 2-1, and a spring 7 and a floating sleeve 9 are arranged below the limit step 2-1. The spring 7 and the floating sleeve 9 are sleeved on the valve core 2, and the floating sleeve 9 is positioned below the spring 7. The valve core 2 is sleeved with a spring 7 and a floating sleeve 9. The floating sleeve 9 is positioned below the spring 7, a groove is formed on the circumferential surface of the valve core 2, and a shaft retainer ring 8 is arranged in the groove. The shaft retainer ring 8 is used for limiting the floating sleeve 9, the floating sleeve 9 is pressed on the shaft retainer ring 8 in a free state, and the spring 7 provides thrust. The floating sleeve 9 is axially opposite to the blocking platforms 1-4, and when the floating sleeve 9 is closed, the floating sleeve 9 is pressed on the blocking platforms 1-4.

The outer surface of the floating sleeve 9 is a conical surface, and a variable throttling channel is formed between the floating sleeve 9 and the throttling steps 1-5. The outer surface of the floating sleeve 9 is provided with a guide groove 9-1, and when fluid passes through the variable throttling channel and the guide groove 9-1, the stability of the floating sleeve 9 is improved, and the floating sleeve 9 is prevented from rotating greatly. The baffle table 1-4 is provided with a throttling hole 1-41, and the throttling hole 1-41 is communicated with the lower side surface of the baffle table 1-4 and the inner side surface of the throttling step 1-5. The orifices 1-41 always provide a channel for fluid to pass through, and pressure build-up is prevented in the opening and closing stages of the valve core 2.

The inner wall of the valve seat 1-3 is provided with a step sink groove 1-31, and a sealing ring 11 is arranged in the step sink groove 1-31. The lower end of the valve core 2 is a conical body. When the valve core 2 is closed, the conical surface of the valve core 2 is pressed on the upper ends of the stepped sunken grooves 1-31 and the sealing ring 11, and the sealing ring 11 is subjected to certain pressure to provide sealing performance.

The valve rod 5 and the valve core 2 are connected by screw thread. The lower end of the valve rod 5 is installed in a threaded blind hole at the upper end of the valve core 2 through threaded connection. The lower end of the valve rod 5 is provided with a lower fastening nut 3, and the lower fastening nut 3 is tightly pressed on the upper end surface of the valve core 2, so that the reliable connection of the valve rod 5 and the valve core 2 is ensured.

The elastic pad 10 is sleeved at the lower end of the valve rod 5, and a counter bore is formed in the axis of the lower end of the elastic pad 10 and used for placing the lower fastening nut 3. An upper fastening nut 4 is arranged above the elastic cushion 10, and the upper fastening nut 4 is tightly pressed on the upper end surface of the elastic cushion 10, so that the stability of the elastic cushion 10 is ensured. The lower side surface of the valve cover 6 is a plane, and a counter bore opposite to the upper fastening nut 4 is formed in the lower side surface of the valve cover 6. After the valve core 2 is opened, the upper fastening nut 4 enters a counter bore on the lower side surface of the valve cover 6, and the elastic pad 10 abuts against the lower side surface of the valve cover 6, so that the buffering effect is achieved, and impact and vibration noise are reduced.

The working principle is as follows: when the valve core 2 is closed, the floating sleeve 9 starts to enter the throttling steps 1-5, a throttling channel is formed between the floating sleeve 9 and the throttling steps 1-5, and the throttling channel is reduced and the buffering is increased as the valve core 2 continues to descend. After the valve core 2 is closed, the floating sleeve 9 presses on the baffle table 1-4, and fluid circulates through the throttling hole 1-41 to prevent the tail end of the stroke from being suppressed.

In the process of opening and closing the valve core 2 in the embodiment, the fluid pushes the floating sleeve 9, a variable throttling channel is formed between the floating sleeve 9 and the throttling steps 1-5, and fluid impact is buffered; the buffering structure formed by the floating sleeve 9 and the throttling steps 1-5 does not influence the normal movement of the valve core 2, and the valve core 2 is rigidly connected with the valve rod 5, so that an operator can accurately control the position of the valve core 2 and control the flow of fluid.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A valve core buffer structure comprises a valve body (1), wherein an inlet pipeline (1-1) and an outlet pipeline (1-2) are arranged on the valve body (1); a valve core (2) is installed in a valve core hole of the valve body (1), a valve seat (1-3) matched with the valve core (2) is arranged on the inner wall of the valve core hole, and a valve cover (6) is installed at the upper end of the valve core hole; the valve core (2) is connected with a valve rod (5), and the valve rod (5) penetrates through the valve cover (6); the method is characterized in that:

the inner wall of the valve core hole of the valve body (1) is provided with a throttling step (1-5), the lower end of the throttling step (1-5) is provided with a baffle table (1-4), and the baffle table (1-4) is positioned above the valve seat (1-3); the circumferential surface of the valve core (2) is provided with a limiting step (2-1), and the valve core (2) is sleeved with a spring (7) and a floating sleeve (9); the floating sleeve (9) is positioned below the spring (7), and a shaft check ring (8) used for limiting the floating sleeve (9) is arranged on the circumferential surface of the valve core (2);

the inner surface of the throttling step (1-5) is a conical surface; the outer surface of the floating sleeve (9) is a conical surface, and the floating sleeve (9) is axially opposite to the baffle tables (1-4); a flow guide groove (9-1) is formed in the outer surface of the floating sleeve (9);

the baffle table (1-4) is provided with a throttling hole (1-41), and the throttling hole (1-41) is communicated with the lower side surface of the baffle table (1-4) and the inner side surface of the throttling step (1-5).

2. The valve core buffering structure as claimed in claim 1, wherein the inner wall of the valve seat (1-3) is provided with a stepped sinking groove (1-31), and a sealing ring (11) is installed in the stepped sinking groove (1-31); the lower end of the valve core (2) is a conical body, and the conical surface of the valve core (2) is pressed on the upper ends of the stepped sinking grooves (1-31) and the sealing ring (11).

3. The valve core buffering structure as claimed in claim 1, wherein the shaft center of the upper end surface of the valve core (2) is provided with a threaded blind hole, and the lower end of the valve rod (5) is installed in the threaded blind hole of the upper end of the valve core (2) through threaded connection; and a lower fastening nut (3) is arranged at the lower end of the valve rod (5), and the lower fastening nut (3) is tightly pressed on the upper end surface of the valve core (2).

4. The valve core buffering structure as claimed in claim 3, wherein an elastic pad (10) is sleeved at the lower end of the valve rod (5), a counter bore is formed in the axis of the lower end of the elastic pad (10), and the lower fastening nut (3) is located in the counter bore of the elastic pad (10); an upper fastening nut (4) which is installed on the valve rod (5) through threaded connection is arranged above the elastic pad (10), and the upper fastening nut (4) is tightly pressed on the upper end face of the elastic pad (10); the lower side surface of the valve cover (6) is a plane, and a counter bore opposite to the upper fastening nut (4) is formed in the lower side surface of the valve cover (6).

5. The valve core buffering structure as claimed in claim 1, wherein the valve rod (5) and the valve cover (6) are in threaded connection; the valve rod (5) is a manual valve rod or an electric valve rod.