CN116085500A - A new type of non-return valve with damping buffer air chamber valve core without impact and noise - Google Patents
A new type of non-return valve with damping buffer air chamber valve core without impact and noise Download PDFInfo
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- CN116085500A CN116085500A CN202310081767.0A CN202310081767A CN116085500A CN 116085500 A CN116085500 A CN 116085500A CN 202310081767 A CN202310081767 A CN 202310081767A CN 116085500 A CN116085500 A CN 116085500A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
- F16K15/065—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring spring pulling the closure member against the seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1013—Adaptations or arrangements of distribution members the members being of the poppet valve type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/01—Damping of valve members
- F16K47/011—Damping of valve members by means of a dashpot
- F16K47/0111—Damping of valve members by means of a dashpot the valve members comprising a plunger sliding within a fixed dashpot
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
Description
技术领域technical field
本发明涉及压缩机领域,尤其涉及大型往复活塞式气体压缩机输出口的具有阻尼缓冲气室,阀芯无撞击,工作无噪声、长寿命、高可靠性止回阀。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.
背景技术Background technique
大型往复活塞式压缩机应用广泛,遍及工农业、交通运输业、生活供水、医药、国防等领域。在国民经济发展中具有举足轻重的地位。这种压缩机用在生产流程中往往要求连续不间断地运行,对压缩机的安全性、可靠性和节能,都提出了更高的要求。压缩机输出口管道装有止回阀,其功能是阻止输出压缩气体在停机或卸荷时的返流。一旦失效会导致压缩机能耗增加,甚至危及压缩机的安全运行。对于大型中高压压缩机,传统的止回阀的止回元件形状多为柱塞式、锥塞式;运动方式均为往复式;弹簧复位。由于往复活塞压式缩机输出气流具有脉动性,导致止回阀的阀芯在工作中来回撞击,产生较强的噪声,阀芯易损坏,密封性难以持久,压缩机卸荷或停机时漏气,浪费能源。而且,市场上此类止回阀的阀腔常常采用压配合封闭结构,阀芯封死在阀腔内,用户拆开维修很困难,一旦泄漏严重,只能整体更换新阀,造成浪费,成为行业中的老大难问题。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.
上述止回阀,阀芯往复运动,形成撞击,是此类止回阀问题产生的根本原因。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.
本发明的新型止回阀,采用阻尼缓冲气室结构,解决了阀芯在工作中来回撞击的问题,工作中无噪声,能持久保持优良的密封性能,工作寿命超长。这对大型往复活塞式压缩机的安全运行和节能是非常有利的。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.
发明内容Contents of the invention
本发明要解决的技术问题是设计一种新型止回阀,其阀芯工作时不产生撞击,其外部的安装尺寸,对应公称通径(DN)、公称压力(PN)与传统结构的止回阀相一致,具有互换性,安装时不需要改动管道。失效的旧止回阀,稍加修理改进,换上新型阀芯就能具有新型止回阀的功能,结构简洁,易于制造与维保,符合绿色低碳的国策。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.
为解决上述技术问题,本发明提供的具有阻尼缓冲气室,阀芯无撞击无噪声新型止回阀,包括阀体、气室座、气室套、阀芯杆、导向套、弹簧、卡簧、O形圈、阀芯头、密封垫;装配后阀芯的有效行程h1应小于h2。h1的取值应满足所形成的阀隙通流面积,大于止回阀的公称通径DN的面积。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.
本发明中,其阻尼缓冲气室组件由多个零件组成,即:阻尼缓冲气室安装座、阻尼缓冲气室套等组成、气室套嵌装在气室座孔内,下端面平齐。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.
本发明中,气室座上部作有外螺纹M1,与阀体出口孔内的内螺纹M1相配合,并借助上端的扳手槽拧紧到阀体的M1内螺纹孔内,下端作有精密圆孔D1、D2,与气室套的外圆d1、d2相配合;气室座内孔D2的孔深h4与气室套外圆柱d2的轴向高h2相等,装配后两者下端面平齐;气室套最下端作有轴向高度h1的、大端外径向下的锥体,与相配件气室座相配合的孔D2构成环形槽,两件下部平齐;由于O形圈的密封条d大于气室套下端倒锥体的轴向高度h1,故O形圈装入环槽内稍凸出环槽下端面,起缓冲作用,倒锥体防止O形圈滑脱,气室套内孔顶部作有D2空刀孔、D3浅孔用做弹簧定心。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.
本发明中,构成气室腔的气室套内装有阀芯组件;阀芯组件的阀芯杆(含导向套)在阻尼缓冲气室内可自由滑动,其配合直径、配合间隙的大小取值,应满足阻尼效果明显而适度:即开机工作时阀芯无撞击,仅在开启状态下小幅度上下脉动;停机后借助阀芯自重和弹簧的弹力及时关闭。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.
本发明中,其阀芯组件的阀芯杆(含导向套),装配在气室组件的孔内,其配合直径和配合间隙的取值应通过试验进行优化;使所组成阻尼缓冲气室腔的封闭容积,随阀芯的运动有明显且适度的变化,使阻尼缓冲效果明显且保持长期稳定,不发生阀芯卡滞或撞击。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.
本发明中,阀芯组件由密封垫圈、阀芯头、阀芯杆、导向套、卡簧、弹簧等组成;其中阀芯杆、导向套径向尺寸应进行优化设计。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.
本发明中,阀芯杆由两段同心外圆柱体组成,上端的大圆柱体套装导向套,大圆柱体近顶端外圆作有卡簧环槽,内装特制卡簧,阻止衬套从阀芯杆上端滑脱,大圆柱体中心顶端作有小内圆孔,孔内装有弹簧,阀芯杆下端较小直径圆柱体上套装阀芯头,借助垫圈、六角螺栓拧紧在阀芯杆下端小外圆柱上;下端短外圆柱上作有环槽,内装密封垫圈。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.
本发明的有益效果在于:(1)工作中阀芯往复运动受缓冲气室的阻尼,不产生撞击,通过缓冲气室结构的阻尼作用,使阀芯往复运动幅度大大减小。由于压缩机往复运动速度较快,工作时,阀芯在打开状态下作小幅度往复脉动,来不及复位,故无撞击,也不会产生噪声;停机后能保证阀芯及时关闭,密封性良好,工作寿命长,可靠性高,实现了大型压缩机的安全运行和节能,具有良好的社会经济效益。(2)O形圈装入环槽内稍凸出环槽下端面,当压缩机启动瞬间,输出的气流突然冲开阀芯、或长期使用产生磨损导致配合间隙过大时,阀头的上端面,可能撞击气室组件的下端面,凸岀的O形圈起缓冲作用,而且倒锥体设计可以避免O形圈滑脱,提升其工作的稳定性和可靠性。(3)通气孔总面积略大于公称通径DN,以保证止回阀最佳的工作状态。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.
附图说明Description of drawings
为了清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简要介绍。显而易见,下面所描述的附图仅仅是本发明的一些实施例,本领域的技术人员可以在不付出创造性劳动的情况下,根据这些附图衍延生出其他的附图。凡在本申请的精神和原则之内,所作的任何修改、改进、等同替换等,均应包含在本申请的保护范围内。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.
图1:具有阻尼缓冲气室、阀芯无撞击的新型止回阀剖视图;Figure 1: Sectional view of a new type of check valve with a damping buffer air chamber and no impact on the valve core;
图2:阀体剖视图;Figure 2: Sectional view of the valve body;
图3:阻尼缓冲气室(以下简称气室)结构剖视图;Figure 3: Sectional view of the structure of the damping buffer air chamber (hereinafter referred to as the air chamber);
图4:气室组件剖视图;Figure 4: Sectional view of the air chamber assembly;
图5:气室座剖视图;Figure 5: Sectional view of the air chamber seat;
图6:气室座横截面图;Figure 6: Cross-sectional view of the air chamber seat;
图7:气室套剖视图;Figure 7: Sectional view of the air chamber cover;
图8:阀芯组件剖视图。Figure 8: Sectional view of the spool assembly.
具体实施方式Detailed ways
下面结合附图,对本发明的一些实施方式作详细说明。在符合缓冲气室工作原理的前提下,可以有多种衍生的实施方案。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.
如图1所示,本实施例中的具有阻尼缓冲气室阀芯无撞击无噪声新型止回阀,采用模块化结构。基本结构由阀体1.1、气室座1.2、气室套1.3、阀芯杆1.4、导向套1.5、弹簧1.6、卡簧1.7、O型圈1.8、阀芯头1.9、密封垫1.10等组成。阻尼缓冲气室腔由气室组件3.1和阀芯组件3.2构成;气室组件3.1由图1中的1.2、1.3、1.8组成;阀芯组件由图1中的1.4、1.5、1.7、1.9、1.10等组成。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.
如图2所示,阀体与传统止回阀体一致,并执行国家相关标准,生产条件应符合国家相关法规。阀体的出口端孔内作有内螺纹M1,其下端的空刀槽端面、D1孔、下部的D2孔、d1外圆及其环形端面上的R圆弧面,均有一定的精度要求,应与M1在一次安装下作成,确保气室座(1.2)的准确定位;D1、D2之间有一段通气空腔;从空刀槽下侧面到R圆弧形成环形端面之间的距离H的取值,应满足阀芯组件(图8)开启有效行程h1(参见图1)所形成的通流面积(D2*π*h1)(参见图2),大于止回阀的公称通径DN的面积。其余部分与传统阀体相同。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.
如图3和4所示,阻尼缓冲气室腔由气室组件3.1、阀芯组件3.2构成。阀芯组件(参见图8)的阀芯杆8.3外装导向套8.4;气室组件(参见图4)由气室座4.1其孔内镶嵌气室套4.2及O形圈4.3组成。阀芯组件(参见图8)的芯杆8.3外装导向套8.4,装入气室组件的气室套4.2的D1孔内,构成封闭容积可随阀芯组件往复运动而变化的阻尼缓冲气室腔。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 .
进一步说明如下,如图5和6所示。气室座1.2是一个内外圆均有多处肩台的圆筒体;上部圆最大直径外圆作成M1外螺纹,与阀体1.1出口处的M1内螺纹相配合,M1上端面作有扳手槽b1,用于拧紧气室组件,M1外螺纹下端的d1短外圆柱用于在阀体中安装定心。为保证安装精度,气室座的外螺纹M1、M1的下端面、d1外圆均应在一次安装下车成,保证足够的精度;气室座中段作有多个径向通气孔b2*h2(参见图5、图6),通气孔的下沿有斜度,以减少气流阻力,通气孔总面积应略大于公称通径DN的面积;气室座上部内孔从M1至通气孔下沿,是气流通道,均为自由公差;气室座下端设有两个均与M1外螺纹同轴的精确圆柱孔D1和深度为h4的D2,与气室套(参见图7)的h2等高。如图7所示,气室套的外圆柱d1、d2嵌装在气室座(参见图5)相应的同轴孔D1、D2内;由于气室套d2外圆柱肩台至下端距离h2与气室座的D2孔深h4相同,相配后两件下端平齐。气室套下端作有轴向高为h1外圆锥体,大径d3向下,单边角度为α与气室座下端D2孔构成环形槽,O形圈4.3装在环槽内,由于环槽深h1小于O形圈4.3的截面直径,故装入的O形圈(4.3)凸出环槽下端面。当压缩机启动瞬间,输出的气流突然冲开阀芯、或长期使用产生磨损导致配合间隙过大时,阀头的上端面,可能撞击气室组件的下端面,凸岀的O形圈起缓冲作用。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.
如图8所示,阀芯组件由密封垫圈8.1、阀芯头8.2、阀芯杆8.3、导向套8.4、卡簧8.5、弹簧8.6、平垫8.7、六角螺栓8.8等组成。阀芯杆8.3由两段同心外圆柱体组成,上端的大圆柱体套装有导向套8.4,大圆柱体近顶端外圆作有卡簧环槽,内装特制轴用卡簧8.5阻止导向套8.4轴向移动,大圆柱体中心顶端作有小内圆孔,孔内装有弹簧8.6,阀芯杆下端作有与大径圆柱体同轴的小直径圆柱体,小直径圆柱体上套装阀芯头8.2,借助六角螺栓8.8、垫圈8.7拧紧在阀芯杆下端小外圆柱体上;阀芯头8.2下端小外圆柱体上作有环槽,内装密封垫圈8.1。阀芯组件是止回阀的启闭元件,装在阻尼缓冲气室的孔内,构成阻尼缓冲腔。阀芯组件往复运动引起阻尼缓冲腔的容积变率及阀芯与气室的配合间隙的大小,影响阻尼效果的强弱。容积变化率大,阻尼效果增强,反之减弱;而配合间隙的大小与阻尼效果强弱成反比。而阀芯杆套与气室套的配合直径的大小,直接影响上述的缓冲腔的容积变化率;直径增大,容积变化率增强,反之减弱。因此在结构空间允许的条件下,适当增加此直径是可取的。阻尼效果的强弱,应确保止回阀工作时不发生撞击,仅在开启状态下小幅度往复脉动,空压机停机后,在组合阀芯自重及弹簧弹力作用下,迅速关闭通道,阻止储气罐内压缩气体返流。其配合间隙(单边)的大小用试验法确定,大约为运动副配合直径的0.0045~0.0047mm。间隙过大,缓冲效果减弱,振幅加大,可能导致阀芯撞击;间隙过小缓冲效果增强,可能引发阀芯卡滞。弹簧8.6作用是确保阀芯在工作时产生脉动,压缩机停机或卸荷时及时关闭。弹力不宜过大,也不能太小。弹力过大,则工作时阀芯振幅加大,使阀芯头与阀体构成的通流面积减小,导致排气阻力加大;弹力过小或取消弹簧,则工作时阀芯可能无脉动地停留在开启状态,时间长了,由于水湿气和气体含杂质等原因,阀芯可能被粘住,在停机或卸荷时,产生延迟关闭甚至不能关闭。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.
进一步说明阻尼缓冲气室的工作原理:当阀芯在缓冲室内轴向移动时,引起封闭的容腔体积变化:阀芯上行时,容腔的容积减小,腔内气体受压缩,压力增加,阻滞阀芯上行,同时部分气体从配合间隙流出阻尼缓冲室,此过程称压缩阻尼;当阀芯下行时,容腔的容积扩大,产生负压(相对阻尼缓冲室外部气压),室外气体被吸进室内,阻滞阀芯下行,称负压阻尼。因此,在输出脉动压缩气体的作用下,阀芯在开启状态下,上下往复小幅脉动,停机或卸荷时,阀芯在自重和弹簧8.6的作用下及时关闭。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.
以上所述仅为本申请的优选施例而已,并不用于限制本申请,对于本领域的技术人员来说,本申请可以有各种更改和变化。例如,阻尼缓冲室,这是本发明的关键,就可有多种不同的构成方案。例如,只要对阀芯杆材料加以筛选,或对表面进行减摩耐磨处理,就可取消导向套,等等。凡在本申请的方案精神原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。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.
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CN2554389Y (en) * | 2002-01-22 | 2003-06-04 | 邱克敏 | Buffer check valve of air compressor |
CN2563386Y (en) * | 2002-08-30 | 2003-07-30 | 陈隽 | Shock-proof check valve |
CN201031979Y (en) * | 2007-04-02 | 2008-03-05 | 程渭钦 | Back valve of air compressor |
CN113883326A (en) * | 2021-10-28 | 2022-01-04 | 中国船舶重工集团衡远科技有限公司 | Pressurizing delay device |
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CN2554389Y (en) * | 2002-01-22 | 2003-06-04 | 邱克敏 | Buffer check valve of air compressor |
CN2563386Y (en) * | 2002-08-30 | 2003-07-30 | 陈隽 | Shock-proof check valve |
CN201031979Y (en) * | 2007-04-02 | 2008-03-05 | 程渭钦 | Back valve of air compressor |
CN113883326A (en) * | 2021-10-28 | 2022-01-04 | 中国船舶重工集团衡远科技有限公司 | Pressurizing delay device |
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