CN116085500A

CN116085500A - Novel non-impact noiseless check valve with damping buffer air chamber valve core

Info

Publication number: CN116085500A
Application number: CN202310081767.0A
Authority: CN
Inventors: 顾晓宁; 顾余舜; 芮勇强
Original assignee: Nanjing Shangair Machinery Manufacturing Co ltd
Current assignee: Nanjing Shangair Machinery Manufacturing Co ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-05-09

Abstract

The invention discloses a novel non-impact noiseless check valve with a damping buffer air chamber valve core. The valve core rod with the guide sleeve is inserted into the sleeve hole of the air chamber to form a damping buffer cavity with the closed volume changing along with the up-and-down movement of the valve core. When in operation, the valve core is flushed by the output gas, and the valve core reciprocates under the action of the pulsating gas flow; when the valve core is upward, the volume of the air chamber is reduced, the air is compressed, and is discharged from the fit clearance to block the valve core from upward movement, and the process is called compression damping; when the valve core descends, the volume of the air chamber is enlarged, air is sucked, the valve core is blocked from descending, and negative pressure damping is formed. The damping action of the buffer air chamber reduces the reciprocating motion amplitude of the valve core. When in operation, the valve core performs small-amplitude reciprocating pulsation in an open state, so that the valve core is not reset, and no impact and no noise are generated; the valve core is closed in time after the machine is stopped, the sealing performance is good, the service life is long, and the reliability is high. The method is favorable for the safe operation of the large-scale compressor and has good social and economic benefits.

Description

Novel non-impact noiseless check valve with damping buffer air chamber valve core

Technical Field

The invention relates to the field of compressors, in particular to a check valve which is provided with a damping buffer air chamber, a valve core, no impact, no noise, long service life and high reliability and is arranged at an output port of a large-sized reciprocating piston type gas compressor.

Background

The large reciprocating piston compressor has wide application, and can be used in the fields of industry and agriculture, transportation industry, domestic water supply, medicine, national defense and the like. Has important roles in national economy development. The compressor is often required to run continuously in a production process, and higher requirements are put on the safety, reliability and energy conservation of the compressor. The compressor output port pipe is equipped with a check valve, the function of which is to prevent the backflow of the output compressed gas during shutdown or unloading. Once disabled, this can lead to increased compressor energy and even jeopardize safe operation of the compressor. For a large-sized medium-high pressure compressor, the check element shape of the traditional check valve is mostly in a plunger type or a taper plug type; the movement modes are reciprocating; the spring is reset. Because the output air flow of the reciprocating piston compression compressor has pulsatility, the valve core of the check valve is impacted back and forth in operation, stronger noise is generated, the valve core is easy to damage, the tightness is difficult to last, air leakage is caused when the compressor is unloaded or stopped, and energy is wasted. Moreover, valve cavities of the check valves on the market often adopt press fit closed structures, valve cores are sealed in the valve cavities, users are difficult to disassemble and maintain, once leakage is serious, only new valves can be integrally replaced, waste is caused, and the check valves become a great problem in the industry.

The check valve, the valve core reciprocates to form impact, which is the root cause of the problem of the check valve.

The novel check valve adopts a damping buffer air chamber structure, solves the problem of impact of the valve core back and forth during operation, has no noise during operation, can permanently maintain excellent sealing performance, and has long service life. This is very advantageous for safe operation and energy saving of a large reciprocating piston compressor.

Disclosure of Invention

The invention aims to solve the technical problems of designing a novel check valve, wherein a valve core of the novel check valve does not generate impact when in work, the external installation size of the novel check valve corresponds to the nominal Diameter (DN) and the nominal Pressure (PN) to be consistent with those of the check valve with a traditional structure, the novel check valve has interchangeability, and a pipeline does not need to be changed when in installation. The old check valve which is invalid is slightly repaired and improved, the novel check valve can be replaced by a novel valve core, the structure is simple, the manufacture and maintenance are easy, and the novel check valve meets the national policy of green low carbon.

In order to solve the technical problems, the novel check valve with the damping buffer air chamber and the non-impact and noiseless valve core provided by the invention comprises a valve body, an air chamber seat, an air chamber sleeve, a valve core rod, a guide sleeve, a spring, a clamp spring, an O-shaped ring, a valve core head and a sealing gasket; the effective stroke h1 of the assembled valve core is smaller than h 2. The value of h1 should satisfy the formed valve clearance flow area, which is larger than the area of the nominal diameter DN of the check valve.

In the invention, the damping buffer air chamber component consists of a plurality of parts, namely: the damping buffer air chamber is composed of a damping buffer air chamber mounting seat, a damping buffer air chamber sleeve and the like, the air chamber sleeve is embedded in an air chamber seat hole, and the lower end face is flush.

In the invention, the upper part of the air chamber seat is provided with external threads M1 which are matched with internal threads M1 in the outlet hole of the valve body, and the air chamber seat is screwed into an internal threaded hole M1 of the valve body by means of a spanner groove at the upper end, and the lower end is provided with precise round holes D1 and D2 which are matched with excircles D1 and D2 of the air chamber sleeve; the hole depth h4 of the inner hole D2 of the air chamber seat is equal to the axial height h2 of the outer cylinder D2 of the air chamber sleeve, and the lower end surfaces of the air chamber seat and the air chamber sleeve are flush after assembly; the lowest end of the air chamber sleeve is provided with a cone with axial height h1 and a large end with a downward outer diameter, a hole D2 matched with the air chamber seat of the corresponding part forms an annular groove, and the lower parts of the two parts are level; because the sealing strip D of the O-shaped ring is larger than the axial height h1 of the inverted cone at the lower end of the air chamber sleeve, the O-shaped ring is arranged in the annular groove and slightly protrudes out of the lower end face of the annular groove to play a role in buffering, the inverted cone prevents the O-shaped ring from slipping, and a D2 empty cutter hole and a D3 shallow hole are formed in the top of the inner hole of the air chamber sleeve and used for centering a spring.

In the invention, a valve core component is arranged in an air chamber sleeve forming an air chamber cavity; the valve core rod (comprising a guide sleeve) of the valve core assembly can freely slide in the damping buffer air chamber, and the values of the matched diameter and the matched clearance of the valve core rod can be met, so that the damping effect is obvious and moderate: the valve core is not impacted when the machine is started, and only small-amplitude up-down pulsation is realized in the starting state; and the valve is closed in time by means of the dead weight of the valve core and the elasticity of the spring after the valve is stopped.

In the invention, a valve core rod (comprising a guide sleeve) of a valve core assembly is assembled in a hole of an air chamber assembly, and the values of the matching diameter and the matching clearance of the valve core rod are optimized through a test; the closed volume of the damping buffer air chamber cavity is obviously and moderately changed along with the movement of the valve core, so that the damping buffer effect is obvious and stable for a long time, and the valve core clamping stagnation or impact does not occur.

In the invention, the valve core component consists of a sealing gasket, a valve core head, a valve core rod, a guide sleeve, a clamp spring, a spring and the like; wherein the radial dimensions of the valve core rod and the guide sleeve should be optimally designed.

According to the invention, a valve core rod consists of two sections of concentric outer cylinders, a guide sleeve is sleeved on a large cylinder at the upper end, a snap ring groove is formed in the outer circle of the large cylinder near the top end, a special snap ring is arranged in the guide sleeve, a bushing is prevented from slipping from the upper end of a valve core rod, a small inner round hole is formed in the center top end of the large cylinder, a spring is arranged in the hole, a valve core head is sleeved on a cylinder with a smaller diameter at the lower end of the valve core rod, and the guide sleeve is screwed on the small outer cylinder at the lower end of the valve core rod by virtue of a gasket and a hexagonal bolt; the short outer cylinder at the lower end is provided with a ring groove, and a sealing gasket is arranged in the ring groove.

The invention has the beneficial effects that: (1) The valve core reciprocating motion is damped by the buffer air chamber in the working process, no impact is generated, and the valve core reciprocating motion amplitude is greatly reduced through the damping effect of the buffer air chamber structure. Because the reciprocating speed of the compressor is higher, when the compressor works, the valve core performs small-amplitude reciprocating pulsation in an open state so as not to return, so that no impact exists and noise is not generated; after the machine is stopped, the valve core can be ensured to be closed in time, the sealing performance is good, the working life is long, the reliability is high, the safe operation and energy saving of the large-sized compressor are realized, and the method has good social and economic benefits. (2) When the O-shaped ring is arranged in the ring groove and slightly protrudes out of the lower end surface of the ring groove, and when the compressor is started instantly, the output air flow suddenly rushes out of the valve core or is worn after long-term use, so that the fit clearance is overlarge, the upper end surface of the valve head possibly impacts the lower end surface of the air chamber component, the protruding O-shaped ring plays a role in buffering, and the inverted cone design can prevent the O-shaped ring from slipping off, so that the stability and the reliability of the work of the valve are improved. (3) The total area of the vent holes is slightly larger than the nominal diameter DN so as to ensure the optimal working state of the check valve.

Drawings

In order to 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 evident that the drawings described below are only some embodiments of the present invention and that other drawings may be derived from them by a person skilled in the art without inventive effort. Any modification, improvement, equivalent replacement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Fig. 1: a cross-sectional view of the novel check valve with a damping buffer air chamber and a valve core without impact;

fig. 2: a valve body cross-sectional view;

fig. 3: a structural cross-section of a damping buffer air chamber (hereinafter referred to as an air chamber);

fig. 4: a cross-sectional view of the plenum assembly;

fig. 5: a cross-sectional view of the air chamber seat;

fig. 6: a cross-sectional view of the air chamber seat;

fig. 7: a cross-sectional view of the air chamber sleeve;

fig. 8: a cross-sectional view of the valve cartridge assembly.

Detailed Description

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. There are many derivative embodiments that can be used in accordance with the working principle of the buffer chamber.

As shown in fig. 1, the novel non-impact noiseless check valve with a damping buffer air chamber valve core in the embodiment adopts a modularized structure. The basic structure comprises a valve body 1.1, an air chamber seat 1.2, an air chamber sleeve 1.3, a valve core rod 1.4, a guide sleeve 1.5, a spring 1.6, a clamp spring 1.7, an O-shaped ring 1.8, a valve core head 1.9, a sealing gasket 1.10 and the like. The damping buffer air chamber cavity is composed of an air chamber component 3.1 and a valve core component 3.2; the air chamber component 3.1 consists of 1.2, 1.3, 1.8 in fig. 1; the valve core assembly consists of 1.4, 1.5, 1.7, 1.9, 1.10 and the like in fig. 1.

As shown in fig. 2, the valve body is consistent with a conventional check valve body and performs a national related standard, and the production conditions should be in compliance with the national related regulations. An outlet end hole of the valve body is internally provided with an internal thread M1, and an empty cutter groove end surface, a D1 hole, a D2 hole, a D1 excircle and an R arc surface on an annular end surface of the lower end of the valve body have certain precision requirements and are manufactured with M1 under one-time installation, so that the accurate positioning of an air chamber seat (1.2) is ensured; a section of ventilation cavity is arranged between the D1 and the D2; the distance H between the lower side surface of the clearance groove and the circular arc R forming the annular end surface should be the same as the flow area (d2×pi×h1) (see fig. 2) formed by the effective opening stroke H1 (see fig. 1) of the valve core assembly (fig. 8), which is larger than the area of the nominal flow diameter DN of the check valve. The rest is the same as the traditional valve body.

As shown in fig. 3 and 4, the damping buffer air chamber cavity is composed of an air chamber assembly 3.1 and a valve core assembly 3.2. The valve core rod 8.3 of the valve core assembly (see fig. 8) is externally provided with a guide sleeve 8.4; the air chamber component (see fig. 4) is composed of an air chamber seat 4.1, an air chamber sleeve 4.2 and an O-shaped ring 4.3 are embedded in the air chamber seat. The core bar 8.3 of the valve core component (see fig. 8) is externally provided with a guide sleeve 8.4, and is arranged in a D1 hole of the air chamber sleeve 4.2 of the air chamber component to form a damping buffer air chamber with a closed volume which can change along with the reciprocating motion of the valve core component.

Further description is as follows, as shown in fig. 5 and 6. The air chamber seat 1.2 is a cylinder with a plurality of shoulders on the inner circle and the outer circle; the outer circle with the largest diameter of the upper circle is made into an M1 external thread which is matched with an M1 internal thread at the outlet of the valve body 1.1, the upper end surface of the M1 is provided with a spanner groove b1 for tightening the air chamber component, and the short outer circle d1 at the lower end of the external thread of the M1 is used for installing and centering in the valve body. In order to ensure the installation precision, the lower end surfaces of the external threads M1 and M1 of the air chamber seat and the outer circle d1 of the air chamber seat are required to be turned under one-time installation, so that enough precision is ensured; the middle section of the air chamber seat is provided with a plurality of radial vent holes b2 h2 (see fig. 5 and 6), the lower edges of the vent holes are inclined to reduce air flow resistance, and the total area of the vent holes is slightly larger than the area of the nominal diameter DN; the inner hole at the upper part of the air chamber seat is an air flow channel from M1 to the lower edge of the vent hole, and the air flow channel is free tolerance; the lower end of the air chamber seat is provided with two accurate cylindrical holes D1 which are coaxial with the external threads of the M1 and D2 with the depth of h4, and the height of the accurate cylindrical holes is equal to that of h2 of the air chamber sleeve (see figure 7). As shown in fig. 7, the outer cylinders D1, D2 of the air chamber sleeve are embedded in the corresponding coaxial holes D1, D2 of the air chamber seat (see fig. 5); because the distance h2 from the outer cylindrical shoulder to the lower end of the air chamber sleeve D2 is the same as the depth h4 of the hole D2 of the air chamber seat, the two matched lower ends are flush. The lower end of the air chamber sleeve is provided with an outer conical body with axial height h1, the large diameter D3 is downward, the unilateral angle alpha and a hole at the lower end D2 of the air chamber seat form an annular groove, the O-shaped ring 4.3 is arranged in the annular groove, and the depth h1 of the annular groove is smaller than the diameter of the cross section of the O-shaped ring 4.3, so that the O-shaped ring (4.3) arranged in the annular groove protrudes out of the lower end face of the annular groove. When the compressor is started instantly, the output air flow suddenly rushes out of the valve core or is worn after long-term use, so that the fit clearance is overlarge, the upper end face of the valve head possibly impacts the lower end face of the air chamber component, and the protruding O-shaped ring plays a role in buffering.

As shown in fig. 8, the valve core assembly is composed of a sealing washer 8.1, a valve core head 8.2, a valve core rod 8.3, a guide sleeve 8.4, a clamp spring 8.5, a spring 8.6, a flat pad 8.7, a hexagon bolt 8.8 and the like. The valve core rod 8.3 consists of two sections of concentric outer cylinders, a guide sleeve 8.4 is sleeved on a large cylinder at the upper end, a snap ring groove is formed in the outer circle of the large cylinder near the top end, a special shaft is arranged in the guide sleeve to prevent the guide sleeve 8.4 from moving axially by using a snap ring 8.5, a small inner round hole is formed in the center top end of the large cylinder, a spring 8.6 is arranged in the hole, a small-diameter cylinder coaxial with the large-diameter cylinder is arranged at the lower end of the valve core rod, a valve core head 8.2 is sleeved on the small-diameter cylinder, and the valve core head is screwed on the small outer cylinder at the lower end of the valve core rod by means of a hexagonal bolt 8.8 and a gasket 8.7; the small outer cylinder at the lower end of the valve core head 8.2 is provided with a ring groove, and a sealing gasket 8.1 is arranged in the ring groove. The valve core component is an opening and closing element of the check valve and is arranged in a hole of the damping buffer air chamber to form a damping buffer cavity. The reciprocating motion of the valve core component causes the volume change rate of the damping buffer cavity and the size of the fit clearance between the valve core and the air chamber, so that the intensity of the damping effect is affected. The volume change rate is high, the damping effect is enhanced, and conversely, the damping effect is weakened; and the size of the fit clearance is inversely proportional to the damping effect. The size of the matching diameter of the valve core rod sleeve and the air chamber sleeve directly influences the volume change rate of the buffer cavity; the diameter increases and the rate of change of volume increases, whereas it decreases. It is therefore desirable to increase this diameter appropriately, as allowed by the construction space. The damping effect is strong and weak, so that the check valve is ensured not to collide when working, and only small-amplitude reciprocating pulsation is generated in an opening state, and after the air compressor is stopped, the channel is quickly closed under the action of the dead weight of the combined valve core and the spring force, so that the compressed gas in the gas storage tank is prevented from flowing back. The size of the fit clearance (unilateral) is determined by a test method and is about 0.0045-0.0047 mm of the fit diameter of the kinematic pair. The gap is too large, the buffer effect is weakened, the amplitude is increased, and the valve core is possibly impacted; the buffer effect is enhanced when the gap is too small, and the valve core clamping stagnation can be caused. The spring 8.6 is used for ensuring that the valve core generates pulsation when working and is closed in time when the compressor is stopped or unloaded. The elastic force should not be too large or too small. When the elasticity is too large, the amplitude of the valve core is increased during working, so that the flow area formed by the valve core head and the valve body is reduced, and the exhaust resistance is increased; if the elastic force is too small or the spring is cancelled, the valve core can stay in an open state without pulsation during working, the valve core can be stuck due to the reasons of water moisture, gas impurities and the like, and delay closing or even closing cannot be realized during shutdown or unloading.

Further explaining the working principle of the damping buffer air chamber: when the valve core moves axially in the buffer chamber, the volume of the closed containing cavity is changed: when the valve core moves upwards, the volume of the containing cavity is reduced, the gas in the cavity is compressed, the pressure is increased, the valve core is blocked from moving upwards, and part of the gas flows out of the damping buffer chamber from the fit clearance, and the process is called compression damping; when the valve core descends, the volume of the containing cavity is enlarged, negative pressure (relative to the external air pressure of the damping buffer chamber) is generated, and outdoor air is sucked into the chamber to block the valve core from descending, so that the negative pressure damping is called. Therefore, under the action of the output pulse compressed gas, the valve core reciprocates up and down to small extent in an opening state, and when the valve core is stopped or unloaded, the valve core is closed in time under the action of dead weight and the spring 8.6.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. For example, a damping buffer chamber, which is the key to the present invention, may be constructed in a number of different ways. For example, the guide sleeve can be omitted by screening the valve core rod material or performing antifriction and wear-resistant treatment on the surface, and the like. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. The utility model provides a novel check valve that has damping buffer air chamber case no striking noiseless which characterized in that: the valve comprises a valve body (1.1), an air chamber seat (1.2), an air chamber sleeve (1.3), a valve core rod (1.4), a guide sleeve (1.5), a spring (1.6), a clamp spring (1.7), an O-shaped ring (1.8), a valve core head (1.9) and a sealing gasket (1.10); the effective stroke h1 of the valve core after assembly is smaller than h2; the value of h1 should satisfy the formed valve clearance flow area, which is larger than the area of the nominal diameter DN of the check valve.

2. The novel non-impact noiseless check valve with damping buffer chamber valve core of claim 1, wherein: the damping buffer air chamber component consists of a plurality of parts, namely: damping buffer air chamber seat (4.1), damping buffer air chamber cover (4.2) etc. are constituteed, and air chamber cover (4.2) inlays in air chamber seat (4.1) hole, and the lower terminal surface is parallel and level.

3. The novel non-impact noiseless check valve with damping buffer chamber valve core according to claim 2, wherein: the upper part of the air chamber seat is provided with external threads M1 which are matched with internal threads M1 in the outlet hole of the valve body, and the air chamber seat is screwed into an internal threaded hole M1 of the valve body by means of a wrench slot at the upper end, and the lower end of the air chamber seat is provided with precise round holes D1 and D2 which are matched with excircles D1 and D2 of the air chamber sleeve; the hole depth h4 of the inner hole D2 of the air chamber seat is equal to the axial height h2 of the outer cylinder D2 of the air chamber sleeve, and the lower end surfaces of the air chamber seat and the air chamber sleeve are flush after assembly; the lowest end of the air chamber sleeve is provided with a cone with axial height h1 and a large end with a downward outer diameter, a hole D2 matched with the air chamber seat of the corresponding part forms an annular groove, and the lower parts of the two parts are level; because the sealing strip D of the O-shaped ring is larger than the axial height h1 of the inverted cone at the lower end of the air chamber sleeve, the O-shaped ring is arranged in the annular groove and slightly protrudes out of the lower end face of the annular groove to play a role in buffering, the inverted cone prevents the O-shaped ring from slipping, and a D2 empty cutter hole and a D3 shallow hole are formed in the top of the inner hole of the air chamber sleeve and used for centering a spring.

4. The novel non-impact noiseless check valve with damping buffer chamber valve core according to claim 3, wherein: a valve core component is arranged in the air chamber sleeve forming the air chamber cavity; the valve core rod (8.3) of the valve core assembly is provided with a guide sleeve (8.4) which can freely slide in the damping buffer air chamber, and the values of the matched diameter and the matched clearance are taken, so that the obvious and moderate damping effect is satisfied: the valve core is not impacted when the machine is started, and only small-amplitude up-down pulsation is realized in the starting state; after the machine is stopped, the valve is closed in time by the dead weight of the valve core and the elasticity of the spring (8.6).

5. The novel non-return valve with damping buffer air chamber and no impact on valve core movement according to claim 4, wherein: the valve core rod of the valve core assembly is assembled in the hole of the air chamber assembly, and the values of the matching diameter and the matching clearance are optimized through a test; the closed volume of the damping buffer air chamber cavity is obviously and moderately changed along with the movement of the valve core, so that the damping buffer effect is obvious and stable for a long time, and the valve core clamping stagnation or impact does not occur.

6. The novel non-impact noiseless check valve with damping buffer chamber valve core according to claim 4 or 5, characterized in that: the valve core consists of a sealing gasket (8.1), a valve core head (8.2), a valve core rod (8.3), a guide sleeve (8.4), a clamp spring (8.5), a spring (8.6) and the like; wherein the radial dimensions of the valve core rod (8.3) and the guide sleeve (8.4) are designed optimally.

7. The novel non-impact noiseless check valve with damping buffer chamber valve core according to claim 6, wherein: the valve core rod (8.3) consists of two sections of concentric outer cylinders, a guide sleeve (8.4) is sleeved on a large cylinder at the upper end, a snap ring groove is formed in the outer circle of the large cylinder near the top end, a special snap ring (8.5) is arranged in the large cylinder to prevent the bushing from slipping from the upper end of the valve core rod, a small inner round hole is formed in the central top end of the large cylinder, a spring (8.6) is arranged in the hole, a valve core head (8.2) is sleeved on a cylinder with a smaller diameter at the lower end of the valve core rod, and the valve core head is screwed on the small outer cylinder at the lower end of the valve core rod by virtue of a gasket (8.7) and a hexagonal bolt (8.8); the short outer cylinder at the lower end is provided with a ring groove, and a sealing gasket (8.1) is arranged in the ring groove.