CN116085500A - A new type of non-return valve with damping buffer air chamber valve core without impact and noise - Google Patents

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

A new type of non-return valve with damping buffer air chamber valve core without impact and noise

technical field

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

Background technique

Large-scale reciprocating piston compressors are widely used in fields such as industry and agriculture, transportation, domestic water supply, medicine, and national defense. It plays a pivotal role in the development of the national economy. This kind of compressor often requires continuous and uninterrupted operation in the production process, which puts forward higher requirements for the safety, reliability and energy saving of the compressor. The compressor outlet pipeline is equipped with a check valve, whose function is to prevent the backflow of the output compressed gas when it is stopped or unloaded. Once it fails, it will increase the energy consumption of the compressor and even endanger the safe operation of the compressor. For large medium and high pressure compressors, the shape of the check element of the traditional check valve is mostly plunger type and cone plug type; the movement mode is reciprocating type; spring reset. Due to the pulsation of the output air flow of the reciprocating piston compressor, the spool of the check valve hits back and forth during work, resulting in strong noise, the spool is easily damaged, the sealing is difficult to last, and the compressor leaks when unloading or stopping. gas, wasting energy. Moreover, the valve cavity of this type of check valve on the market often adopts a press-fit closed structure, the valve core is sealed in the valve cavity, and it is very difficult for the user to disassemble and repair. Big problem in the industry.

In the above-mentioned check valve, the spool moves back and forth to form a collision, which is the root cause of the problem of this type of check valve.

The novel check valve of the present invention adopts a damping buffer air chamber structure, which solves the problem of the valve core bumping back and forth during work, has no noise during work, can maintain excellent sealing performance for a long time, and has a long working life. This is very beneficial to the safe operation and energy saving of large reciprocating piston compressors.

Contents of the invention

The technical problem to be solved by the present invention is to design a new type of check valve, the valve core does not produce impact when it works, and its external installation size corresponds to the nominal diameter (DN), nominal pressure (PN) and the check valve of the traditional structure. The valves are consistent and interchangeable, and there is no need to change the pipeline during installation. The failed old check valve can have the function of a new check valve with a little repair and improvement, and replace it with a new type of valve core. The structure is simple, easy to manufacture and maintain, and it is in line with the national policy of green and low carbon.

In order to solve the above technical problems, the present invention provides a new check valve with a damping buffer air chamber, no impact and no noise of the valve core, including a valve body, an air chamber seat, an air chamber sleeve, a valve core rod, a guide sleeve, a spring, and a circlip , O-ring, spool head, gasket; the effective stroke h1 of the spool after assembly should be less than h2. The value of h1 should satisfy the flow area of the formed valve gap, which is larger than the area of the nominal diameter DN of the check valve.

In the present invention, the damping buffer air chamber assembly is composed of a plurality of parts, namely: a damping buffer air chamber mounting seat, a damping buffer air chamber sleeve, etc., the air chamber sleeve is embedded in the air chamber seat hole, and the lower end surface is flush.

In the present invention, the upper part of the air chamber seat is provided with an external thread M1, which is matched with the internal thread M1 in the outlet hole of the valve body, and is screwed into the M1 internal thread hole of the valve body by means of a wrench groove at the upper end, and a precision round hole is formed at the lower end D1 and D2 are matched with the outer circles 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 two are flush after assembly; The lowermost end of the air chamber sleeve has a cone with an axial height h1 and the outer diameter of the large end is downward, and the hole D2 matched with the air chamber seat of the matching accessory forms an annular groove, and the lower parts of the two parts are flush; due to the sealing of the O-ring Bar d is greater than the axial height h1 of the inverted cone at the lower end of the air chamber sleeve, so the O-ring is installed in the ring groove and slightly protrudes from the lower end of the ring groove to play a buffer role. The inverted cone prevents the O-ring from slipping, and the air chamber sleeve D2 empty knife hole and D3 shallow hole are used for spring centering on the top of the hole.

In the present invention, the valve core assembly is installed in the air chamber sleeve forming the air chamber cavity; the valve core rod (including the guide sleeve) of the valve core assembly can slide freely in the damping buffer air chamber, and the matching diameter and the size of the matching gap are determined according to the The damping effect should be obvious and moderate: that is, there is no impact on the valve core when starting up, and it only pulses up and down in a small range in the open state; after stopping, it can be closed in time with the help of the weight of the valve core and the elastic force of the spring.

In the present invention, the valve core rod (including the guide sleeve) of the valve core assembly is assembled in the hole of the air chamber assembly, and the values of its matching diameter and matching clearance should be optimized through experiments; so that the formed damping buffer air chamber cavity The closed volume has obvious and moderate changes with the movement of the spool, so that the damping and buffering effect is obvious and it remains stable for a long time without spool sticking or impact.

In the present invention, the valve core assembly is composed of a sealing gasket, a valve core head, a valve core rod, a guide sleeve, a circlip, a spring, etc.; wherein the radial dimensions of the valve core rod and the guide sleeve should be optimally designed.

In the present invention, the spool rod is composed of two concentric outer cylinders. The large cylinder at the upper end is fitted with a guide sleeve. The outer circle of the large cylinder near the top is provided with a ring groove, and a special circlip is installed inside to prevent the bushing from moving from the valve core. The upper end of the rod slips off, and a small inner hole is made on the top of the center of the large cylinder, and a spring is installed in the hole. The lower end of the valve core rod is fitted with a smaller diameter cylinder, and the valve core head is set on the small diameter cylinder at the lower end of the valve core rod, and is tightened on the small outer cylinder at the lower end of the valve core rod by means of a washer and a hexagonal bolt. There is a ring groove on the short outer cylinder at the upper and lower ends, and a sealing gasket is installed inside.

The beneficial effects of the present invention are as follows: (1) The reciprocating motion of the valve core is damped by the buffer air chamber during operation without impact, and the amplitude of the reciprocating motion of the valve core is greatly reduced through the damping effect of the buffer air chamber structure. Due to the fast reciprocating speed of the compressor, the valve core reciprocates in a small range when it is working, and it is too late to reset, so there is no impact and no noise; after the shutdown, the valve core can be closed in time, and the sealing is good. It has long working life and high reliability, realizes the safe operation and energy saving of large compressors, and has good social and economic benefits. (2) The O-ring is installed in the ring groove and slightly protrudes from the lower end surface of the ring groove. When the compressor is started, the output airflow suddenly rushes away from the valve core, or when the fit gap is too large due to wear and tear caused by long-term use, the upper part of the valve head The end face may hit the lower end face of the air chamber assembly. The protruding O-ring acts as a buffer, and the inverted cone design can prevent the O-ring from slipping and improve its working stability and reliability. (3) The total area of the vent hole is slightly larger than the nominal diameter DN to ensure the best working condition of the check valve.

Description of drawings

In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that are required in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without creative efforts. Any modifications, improvements, equivalent replacements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Figure 1: Sectional view of a new type of check valve with a damping buffer air chamber and no impact on the valve core;

Figure 2: Sectional view of the valve body;

Figure 3: Sectional view of the structure of the damping buffer air chamber (hereinafter referred to as the air chamber);

Figure 4: Sectional view of the air chamber assembly;

Figure 5: Sectional view of the air chamber seat;

Figure 6: Cross-sectional view of the air chamber seat;

Figure 7: Sectional view of the air chamber cover;

Figure 8: Sectional view of the spool assembly.

Detailed ways

Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. On the premise of conforming to the working principle of the buffer air chamber, there may be various derivative implementations.

As shown in FIG. 1 , the novel non-return valve with a damping buffer air chamber valve core without impact and noise in this embodiment adopts a modular structure. The basic structure is composed of valve body 1.1, air chamber seat 1.2, air chamber sleeve 1.3, valve core rod 1.4, guide sleeve 1.5, spring 1.6, circlip 1.7, O-ring 1.8, valve core head 1.9, gasket 1.10, etc. The damping buffer air chamber cavity is composed of the air chamber assembly 3.1 and the valve core assembly 3.2; the air chamber assembly 3.1 is composed of 1.2, 1.3, 1.8 in Figure 1; the valve core assembly is composed of 1.4, 1.5, 1.7, 1.9, 1.10 in Figure 1 and so on.

As shown in Figure 2, the valve body is consistent with the traditional check valve body, and the relevant national standards are implemented, and the production conditions should comply with the relevant national regulations. There is an internal thread M1 in the outlet hole of the valve body, and the empty knife groove end face at the lower end, the D1 hole, the lower D2 hole, the outer circle of d1 and the R arc surface on the annular end face all have certain accuracy requirements. It should be made under one installation with M1 to ensure the accurate positioning of the air chamber seat (1.2); there is a section of ventilation cavity between D1 and D2; the distance H between the lower side of the empty knife groove and the circular end surface formed by the R arc The value should be satisfied that the flow area (D2*π*h1) (see Figure 2) formed by the valve core assembly (Figure 8) opening the effective stroke h1 (see Figure 1) is greater than the nominal diameter DN of the check valve area. The rest is the same as the traditional valve body.

As shown in Figures 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 spool rod 8.3 exterior guide sleeve 8.4 of the spool assembly (seeing Fig. 8); the air chamber assembly (seeing Fig. 4) is made up of inlaid air chamber cover 4.2 and O-ring 4.3 in its hole of air chamber seat 4.1. The core rod 8.3 of the spool assembly (see Figure 8) is equipped with a guide sleeve 8.4, which is put into the D1 hole of the air chamber cover 4.2 of the air chamber assembly to form a damping buffer air chamber whose closed volume can change with the reciprocating movement of the spool assembly .

Further explanation follows, as shown in Figures 5 and 6. The air chamber seat 1.2 is a cylindrical body with multiple shoulders on both inner and outer circles; the outer circle with the largest diameter of the upper circle is made of M1 external thread, which matches the M1 internal thread at the outlet of valve body 1.1, and the upper end of M1 is provided with a wrench groove b1, used to tighten the air chamber assembly, the d1 short outer cylinder at the lower end of the M1 external thread is used to install the centering in the valve body. In order to ensure the installation accuracy, the outer thread M1 of the air chamber seat, the lower end surface of M1, and the outer circle of d1 should be assembled in one installation to ensure sufficient accuracy; the middle section of the air chamber seat is provided with multiple radial ventilation holes b2*h2 (See Figure 5 and Figure 6), the lower edge of the vent hole has a slope to reduce airflow resistance, the total area of the vent hole should be slightly larger than the area of the nominal diameter DN; the upper inner hole of the air chamber seat is from M1 to the lower edge of the vent hole , is the air flow channel, all of which are free tolerances; the lower end of the air chamber seat is provided with two precise cylindrical holes D1 coaxial with the M1 external thread and D2 with a depth of h4, which is equal to the h2 of the air chamber sleeve (see Figure 7) . As shown in Figure 7, the outer cylinders d1 and d2 of the air chamber sleeve are embedded in the corresponding coaxial holes D1 and D2 of the air chamber seat (see Figure 5); since the distance h2 from the shoulder of the outer cylinder of the air chamber sleeve d2 to the lower end is the same as The hole depth h4 of D2 of the air chamber seat is the same, and the lower ends of the two pieces are flush after matching. The lower end of the air chamber sleeve has an outer cone with an axial height of h1, the major diameter d3 is downward, and the angle of one side is α. It forms an annular groove with the hole D2 at the lower end of the air chamber seat. The O-ring 4.3 is installed in the annular groove. The depth h1 is smaller than the section diameter of the O-ring 4.3, so the installed O-ring (4.3) protrudes from the lower end surface of the ring groove. When the compressor is started, the output airflow suddenly breaks through the valve core, or when the fit gap is too large due to wear caused by long-term use, the upper end surface of the valve head may hit the lower end surface of the air chamber assembly, and the protruding O-ring acts as a buffer effect.

As shown in Figure 8, the spool assembly is composed of a sealing washer 8.1, a spool head 8.2, a spool rod 8.3, a guide sleeve 8.4, a snap ring 8.5, a spring 8.6, a flat washer 8.7, and a hexagonal bolt 8.8. The spool rod 8.3 is composed of two concentric outer cylinders. The large cylinder at the upper end is set with a guide sleeve 8.4. The outer circle of the large cylinder near the top is provided with a ring groove. There is a small inner hole on the top of the center of the large cylinder, and a spring 8.6 is installed in the hole. A small diameter cylinder coaxial with the large diameter cylinder is made on the lower end of the valve core rod, and the valve core head 8.2 is set on the small diameter cylinder. , with the help of hexagonal bolt 8.8 and washer 8.7 to tighten on the small outer cylinder at the lower end of the valve core rod; a ring groove is formed on the small outer cylinder at the lower end of the valve core head 8.2, and a sealing washer 8.1 is installed inside. The valve core assembly is the opening and closing element of the check valve, which is installed in the hole of the damping buffer air chamber to form a damping buffer chamber. The volume change rate of the damping buffer chamber caused by the reciprocating movement of the valve core assembly and the size of the matching gap between the valve core and the air chamber affect the strength of the damping effect. The larger the volume change rate, the stronger the damping effect, and vice versa; and the size of the matching gap is inversely proportional to the strength of the damping effect. The matching diameter of the spool rod sleeve and the air chamber sleeve directly affects the volume change rate of the above-mentioned buffer chamber; the diameter increases, the volume change rate increases, and vice versa. Therefore, it is advisable to increase this diameter appropriately under the condition that the structural space permits. The strength of the damping effect should ensure that there is no impact when the check valve is working, and only a small reciprocating pulsation in the open state. After the air compressor stops, under the action of the combined valve core's own weight and spring force, the passage is quickly closed to prevent storage. Backflow of compressed gas in the tank. The size of the fit gap (unilateral) is determined by the test method, which is about 0.0045-0.0047mm of the fit diameter of the kinematic pair. If the gap is too large, the cushioning effect will be weakened and the amplitude will increase, which may cause the valve core to strike; if the gap is too small, the buffering effect will be enhanced, which may cause the valve core to stick. The effect of spring 8.6 is to ensure that the spool generates pulsation during work, and it is closed in time when the compressor is shut down or unloaded. The elasticity should not be too large, nor too small. If the elastic force is too large, the amplitude of the spool will increase during operation, reducing the flow area formed by the spool head and the valve body, resulting in increased exhaust resistance; if the elastic force is too small or the spring is cancelled, the spool may not pulsate during operation. If it stays in the open state for a long time, due to water moisture and impurities in the gas, the valve core may be stuck, and when it is shut down or unloaded, it will delay closing or even fail to close.

Further explain the working principle of the damping buffer air chamber: when the valve core moves axially in the buffer chamber, the volume of the closed cavity changes: when the valve core moves upward, the volume of the cavity decreases, the gas in the cavity is compressed, and the pressure increases. Blocking the upward movement of the spool, while part of the gas flows out of the damping buffer chamber from the matching gap, this process is called compression damping; when the spool moves downward, the volume of the cavity expands, generating negative pressure (relative to the external pressure of the damping buffer chamber), and the outdoor air is compressed Inhaled into the chamber, blocking the spool down, called negative pressure damping. Therefore, under the action of the output pulsating compressed gas, the valve core reciprocates with small pulses up and down in the open state. When the machine is stopped or unloaded, the valve core is closed in time under the action of its own weight and spring 8.6.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. For example, the damping buffer chamber, which is the key of the present invention, can have many different configurations. For example, as long as the material of the spool rod is screened, or the surface is treated to reduce friction and wear, the guide sleeve can be eliminated, and so on. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the scheme of this application shall be included within the scope of protection of this application.

Claims (7)

1. A new check valve with a damping buffer air chamber valve core without impact and noise, characterized in that it includes a valve body (1.1), an air chamber seat (1.2), an air chamber sleeve (1.3), a valve core rod (1.4 ), guide sleeve (1.5), spring (1.6), circlip (1.7), O-ring (1.8), spool head (1.9), gasket (1.10); the effective stroke h1 of the spool after assembly should be less than h2 ; The value of h1 should satisfy the flow area of the formed valve gap, which is larger than the area of the nominal diameter DN of the check valve. 2. The novel non-return valve with damping buffer air chamber valve core without impact and noise according to claim 1, characterized in that: its damping buffer air chamber assembly is composed of multiple parts, namely: damping buffer air chamber seat (4.1 ), the damping buffer air chamber sleeve (4.2), etc., the air chamber sleeve (4.2) is embedded in the hole of the air chamber seat (4.1), and the lower end surface is flush. 3. According to claim 2, the new check valve with damping buffer air chamber valve core without impact and noise is characterized in that: the upper part of the air chamber seat is provided with an external thread M1, which is consistent with the internal thread M1 in the outlet hole of the valve body. Cooperate, and tighten it into the M1 internal thread hole of the valve body with the help of the wrench slot at the upper end, and the lower end is made with precision round holes D1, D2, which match with the outer circles d1, d2 of the air chamber sleeve; the hole in the inner hole D2 of the air chamber seat The depth h4 is equal to the axial height h2 of the outer cylinder d2 of the air chamber sleeve. After assembly, the lower end surfaces of the two are flush; The matching hole D2 of the accessory air chamber seat forms an annular groove, and the lower parts of the two parts are flush; since the sealing strip d of the O-ring is greater than the axial height h1 of the inverted cone at the lower end of the air chamber sleeve, the O-ring is installed in the annular groove Slightly protruding from the lower end surface of the ring groove, it acts as a buffer. The inverted cone prevents the O-ring from slipping off. The top of the inner hole of the air chamber sleeve has a D2 empty knife hole, and a D3 shallow hole is used for spring centering. 4. According to claim 3, the novel non-return valve with damping buffer air chamber valve core without impact and noise is characterized in that: the air chamber sleeve forming the air chamber cavity is equipped with a valve core assembly; the valve core rod of the valve core assembly ( 8.3) Equipped with a guide sleeve (8.4), it can slide freely in the damping buffer air chamber. The matching diameter and the size of the matching gap should meet the obvious and moderate damping effect: that is, there is no impact on the valve core when it is turned on, and only when it is opened It pulses up and down in a small range under normal conditions; after stopping, it is closed in time with the help of the self-weight of the spool and the elastic force of the spring (8.6). 5. According to claim 4, a novel check valve with a damping buffer air chamber and a valve core movement without impact, is characterized in that: the valve core rod of the valve core assembly is assembled in the hole of the air chamber assembly, and its The values of fit diameter and fit clearance should be optimized through experiments; so that the closed volume of the formed damping buffer air chamber has obvious and moderate changes with the movement of the valve core, so that the damping buffer effect is obvious and long-term stable, without occurrence Spool sticking or knocking. 6. According to claim 4 or 5, the valve core with damping buffer air chamber has no impact and no noise. The new check valve is characterized in that: the valve core is composed of a sealing washer (8.1), a valve core head (8.2), a valve core rod ( 8.3), guide sleeve (8.4), circlip (8.5), spring (8.6), etc.; among them, the radial dimensions of valve core rod (8.3) and guide sleeve (8.4) should be optimized. 7. According to claim 6, the novel non-return valve with damping buffer air chamber valve core without impact and noise is characterized in that: the valve core rod (8.3) is composed of two concentric outer cylinders, and the large cylinder at the upper end is set The guide sleeve (8.4), the outer circle of the large cylinder near the top is provided with a circlip ring groove, and the special circlip (8.5) is installed inside to prevent the bush from slipping off from the upper end of the valve core rod, and the top of the large cylinder is provided with a small inner hole. A spring (8.6) is installed in the hole, and the valve core head (8.2) is set on a cylinder with a smaller diameter at the lower end of the valve core rod, and is tightened on the small outer cylinder at the lower end of the valve core rod by means of a washer (8.7) and a hexagonal bolt (8.8); the lower end is short A ring groove is formed on the outer cylinder, and a sealing gasket (8.1) is installed inside.

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