一种双向流通膨胀阀 技术领域 Bidirectional circulation expansion valve
本发明属于空调技术领域， 涉及一种变频空调制冷用机械自 动膨胀阀， 特别是一种双向流通膨胀阀。 背景技术 The invention belongs to the technical field of air conditioners, and relates to a mechanical automatic expansion valve for inverter air conditioner refrigeration, in particular to a two-way flow expansion valve. Background technique
膨胀阀主要应用于空调制冷系统中， 是制冷系统的重要组成 部分。 膨胀阀使中高温高压的液体制冷剂通过其节流成为低温低 压的湿蒸汽， 然后制冷剂在蒸发器中吸收热量达到制冷效果， 膨 胀阀通过蒸发器末端的过热度变化来控制阀门流量， 防止出现蒸 发器面积利用不足和敲缸现象。 双向膨胀阀主要应用于冷暧型空 调系统中， 采用两个膨胀阀组件并联或串联设置， 实现双向流通 功能。 The expansion valve is mainly used in air conditioning and refrigeration systems and is an important part of the refrigeration system. The expansion valve allows the medium-high temperature and high-pressure liquid refrigerant to become low-temperature and low-pressure wet steam through its throttling, and then the refrigerant absorbs heat in the evaporator to achieve the cooling effect, and the expansion valve controls the valve flow rate by the superheat change at the end of the evaporator, preventing Insufficient use of the evaporator area and knocking. The two-way expansion valve is mainly used in the cold heading air conditioning system. Two expansion valve assemblies are used in parallel or in series to realize the two-way circulation function.
如申请号为 201210418305. 5的发明专利，该发明公布了一种 双向流通膨胀阀， 包括具有两个互相平行的通道的阀块， 每个通 道具有进口端和出口端， 每个出口端处均连接有上述的膨胀阀组 件， 阀块上开设有使一通道上的膨胀阀组件的出口与另一通道的 进口端相连通的旁通孔， 在所述的出口端处还悍接有防止制冷剂 流经旁通孔与出口之间时外泄的保护罩。 这种双向流通膨胀阀将 两个膨胀阀组件并联， 零部件繁多， 结构复杂， 组装比较困难； 而且多个阀体、 保护罩悍接固连在一起， 通道或出进口之间的接 口太多， 潜在的泄露点较多， 导致密封性较差。 发明内容 As for the invention patent of the application No. 201210418305. 5, the invention discloses a bidirectional flow expansion valve comprising a valve block having two mutually parallel passages, each passage having an inlet end and an outlet end, each outlet end being The expansion valve assembly is connected to the valve block, and the valve block is provided with a bypass hole for connecting the outlet of the expansion valve assembly on one passage to the inlet end of the other passage, and the outlet end is further connected to prevent refrigeration A protective cover that leaks when the agent flows between the bypass hole and the outlet. The two-way flow expansion valve connects two expansion valve assemblies in parallel, has various components, complicated structure, and is difficult to assemble; and multiple valve bodies and protective covers are spliced together, and there are too many interfaces between the passages or the inlets and outlets. There are more potential leak points, resulting in poor sealing. Summary of the invention
本发明的目的是针对现有的技术存在上述问题， 提出了一种 可实现双向流通的膨胀阀。
不 明的目的 通;3； 列扠木万茱米头现： 一 W ^ 冋流通膨 胀阀， 包括具有两个进口腔的阀体， 其特征在于， 所述的阀体内 设有双向阀组件一和双向阀组件二， 所述的双向阀组件一的阀腔 和双向阀组件二的阀腔相连通， 双向阀组件一的出口一和双向阀 组件二的进口腔之间设有使制冷剂从出口一流入到进口腔流出的 单向阀组件一， 双向阀组件二的出口一和双向阀组件一的进口腔 之间使制冷剂从出口一流入到进口腔流出的单向阀组件二。 SUMMARY OF THE INVENTION An object of the present invention is to provide an expansion valve which can realize bidirectional circulation in view of the above problems in the prior art. An unidentified purpose; 3; a forked wood Wanmi rice head: a W ^ 冋 circulation expansion valve, comprising a valve body having two inlet chambers, characterized in that the valve body is provided with a two-way valve assembly The two-way valve assembly 2, the valve chamber of the two-way valve assembly is in communication with the valve chamber of the two-way valve assembly 2, and the outlet of the two-way valve assembly and the inlet chamber of the two-way valve assembly 2 are disposed between the outlets of the two-way valve assembly A one-way valve assembly that flows into the inlet chamber, a one-way valve assembly that flows between the outlet of the two-way valve assembly 2 and the inlet chamber of the two-way valve assembly, and the refrigerant flows from the outlet to the inlet chamber.
本双向流通膨胀阀为对称结构， 双向阀组件一和双向阀组件 二结构相同， 单向阀组件一和单向阀组件二结构相同， 制冷剂从 双向阀组件一的进口腔进入， 经过双向阀组件一的出口， 然后通 过单向阀组件一流入到双向阀组件二的进口腔处，最后排出阀体， 反之亦然， 实现双向流通的功能。 The two-way flow expansion valve has a symmetrical structure, and the two-way valve assembly has the same structure as the two-way valve assembly. The one-way valve assembly and the one-way valve assembly have the same structure, and the refrigerant enters from the inlet chamber of the two-way valve assembly through the two-way valve. The outlet of the assembly 1 then flows into the inlet chamber of the two-way valve assembly 2 through the one-way valve assembly, and finally discharges the valve body, and vice versa, to achieve the function of two-way circulation.
在上述的双向流通膨胀阀中， 还包括具有两个接口的外壳， 两个接口分别与阀体的两个进口腔相连通，所述的阀体呈直筒状， 所述的单向阀组件一和单向阀组件二分别具有与进口腔相连通的 出口二， 所述的出口一和出口二均开设在阀体的侧壁上。 In the above bidirectional flow expansion valve, the housing further includes a housing having two interfaces, the two interfaces respectively communicating with the two inlet chambers of the valve body, the valve body being in a straight cylindrical shape, and the one-way valve assembly And the one-way valve assembly 2 respectively has an outlet 2 communicating with the inlet chamber, and the outlet one and the outlet two are both open on the side wall of the valve body.
本双向流通膨胀阀只有一个外壳和阀体， 当制冷剂流量较小 时， 可以从外壳的接口进入， 通过双向阀组件一进入到阀腔， 再 从阀腔到双向阀组件二， 从另一接口流出。 由于双向阀组件一和 双向阀组件二的阀腔相连通， 制冷剂从另一接口反向流动也是可 以的， 实现双向流通的功能。 当制冷剂流量较大时， 从外壳的接 口进入到进口腔， 通过双向阀组件一经阀体侧壁的出口一进入到 外壳与阀体之间的间隙， 然后通过单向阀组件一， 经出口二直接 进入到另一进口腔， 由于具有两组对称的出口一和出口二， 大流 量也可以实现双向流通的功能。 本阀悍接结构少， 阀门内各零部 件的工作都是在一个外壳内完成的， 因此密封性较好， 而且结构 简单。 The two-way flow expansion valve has only one outer casing and a valve body. When the refrigerant flow rate is small, it can enter from the interface of the outer casing, enter the valve cavity through the two-way valve assembly, and then from the valve chamber to the two-way valve assembly two, from the other interface. Flow out. Since the two-way valve assembly is in communication with the valve chamber of the two-way valve assembly 2, it is also possible to reverse the flow of refrigerant from the other interface to realize the bidirectional flow function. When the flow rate of the refrigerant is large, it enters the inlet chamber from the interface of the outer casing, and enters the gap between the outer casing and the valve body through the outlet of the side wall of the valve body through the two-way valve assembly, and then passes through the one-way valve assembly Second, directly into another inlet cavity, because there are two sets of symmetric outlets one and two outlets, large flow can also achieve the function of two-way circulation. The valve has a small splicing structure, and the work of each component in the valve is completed in one casing, so the sealing property is good and the structure is simple.
回 ¾ ¾按 u处的彈黄)坐和甚 I伐」 1不外侧且酡沿宥 |伐」 1不外侧 m动 m 阀块， 所述的外壳相对出口一和出口二之间的内壁上具有凸出的 呈环形的挡沿， 所述的弹簧座与挡沿之间设使阀块具有向挡沿移 动趋势的弹簧一， 且当阀块与挡沿相抵靠时所述的阀块能将出口 二挡住。 弹簧一套在弹簧座上， 当制冷剂流量较小时， 阀块受弹 簧一的弹力作用而抵靠在挡沿上， 出口二被阀块侧面阻挡而处于 关闭状态； 当制冷剂流量增大到一定时， 能够将封住在出口二处 的阀块推开， 使弹簧一受挤压， 制冷剂便从出口二进入到进口腔 然后排出。 In the two-way flow expansion valve described above, the one-way valve assembly one includes Back to 3⁄4 3⁄4 Press the spring at u) and sit and even cut 1 1 No outside and 酡 宥 伐 伐 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Having a convex annular rib, the spring seat and the rim are arranged such that the valve block has a spring-like tendency to move toward the yoke, and the valve block can be used when the valve block abuts against the rim Block the exit two. The spring is set on the spring seat. When the flow rate of the refrigerant is small, the valve block is pressed against the rim by the spring force of the spring, and the outlet 2 is blocked by the side of the valve block and is closed; when the refrigerant flow rate is increased to When necessary, the valve block sealed at the outlet 2 can be pushed open, so that the spring is squeezed, and the refrigerant enters the inlet chamber from the outlet 2 and is discharged.
作为另一种方案， 在上述所述的双向流通膨胀阀中， 所述的 单向阀组件一包括固定在接口处的弹簧座和套在阀体外侧且能沿 着阀体外侧滑动的阀块， 所述的外壳相对出口一和出口二之间的 内壁上具有凸出的呈环形的挡沿， 所述的挡沿与阀块之间还设有 挡圈， 所述的弹簧座与挡圈之间设使阀块具有向挡圈移动趋势的 弹簧一， 且当阀块与挡沿相抵靠时所述的阀块能将出口二挡住。 挡圈设于挡沿与阀块之间， 由于阀块需要相对滑动， 所以与外壳 之间存在间隙， 而挡沿是由外壳成型加工而成， 有一个过渡圆弧， 可能发生阀块定位不可靠， 那么制冷剂容易从间隙中流入到弹簧 一所处的腔室， 造成阀块两边的压力平衡而导致阀块不动， 所以 设置挡圈后， 具有一定密封效果。 In another aspect, in the bidirectional flow expansion valve described above, the one-way valve assembly includes a spring seat fixed at the interface and a valve block that is sleeved outside the valve body and can slide along the outside of the valve body. The inner casing has a convex annular ring on the inner wall between the outlet 1 and the outlet 2, and the retaining ring is further provided with a retaining ring between the retaining edge and the valve block, and the spring seat and the retaining ring There is a spring between the valve block that has a tendency to move toward the retaining ring, and the valve block can block the outlet two when the valve block abuts against the retaining edge. The retaining ring is disposed between the retaining edge and the valve block. Since the valve block needs to slide relative to each other, there is a gap between the outer casing and the outer casing, and the retaining edge is formed by the outer casing molding, and has a transition arc, and the valve block may not be positioned. Reliable, then the refrigerant easily flows from the gap into the chamber where the spring is located, causing the pressure on both sides of the valve block to balance and causing the valve block to move. Therefore, after the retaining ring is provided, it has a certain sealing effect.
在上述所述的双向流通膨胀阀中， 所述的挡圈外侧面与外壳 的内壁紧紧相抵靠。 将高低压制冷剂阻隔在阀块两侧， 防止高压 制冷剂直接从出口二进入进口腔。 为防止挡圈在流体作用下发生 移动， 需要将挡圈与阀体固连， 挡圈中间设置凹槽， 通过在阀体 上滚槽或打点与凹槽相嵌实现固定， 所以挡圈也具有一定密封效 果。 为保证制冷剂的微小流量在一个在比较小的范围变动， 需提 高阀块的密封效果， 防止制冷剂从出口二直接进入到阀体与外壳 之间的间隙中，阀块与外壳之间的间隙很小。为保证阀体不被阀块
磨损， I伐」玦米用硬度 1¾ t I伐」 1不的 w科制成。 In the above-described bidirectional flow expansion valve, the outer side surface of the retaining ring abuts against the inner wall of the outer casing. The high and low pressure refrigerants are blocked on both sides of the valve block to prevent high pressure refrigerant from entering the inlet chamber directly from the outlet 2. In order to prevent the retaining ring from moving under the action of the fluid, it is necessary to fix the retaining ring and the valve body, and a groove is arranged in the middle of the retaining ring, and the groove is also fixed by the groove on the valve body or the dot is embedded in the groove, so the retaining ring also has Certain sealing effect. In order to ensure that the small flow rate of the refrigerant changes in a relatively small range, it is necessary to improve the sealing effect of the valve block, and prevent the refrigerant from directly entering the gap between the valve body and the outer casing from the outlet 2, between the valve block and the outer casing. The gap is small. To ensure that the valve body is not blocked by the valve block Wear, I cut "rice is made with a hardness of 13⁄4 t I".
在上述所述的双向流通膨胀阀中， 所述的弹簧座一端与外壳 相卡嵌， 另一端与阀体相卡嵌， 所述的弹簧座具有连通接口与进 口腔的中心孔， 所述的弹簧座上还开设有连通中心孔与外壳体的 侧孔。 弹簧座固定在外壳上， 具体来说， 其中一个弹簧座的内端 与阀体的一端部相卡嵌， 而另一弹簧座的内端套在阀体上内， 不 仅起固定支撑阀体的作用， 而且保证阀体热胀冷缩的余量。 弹簧 一套在弹簧座的外侧， 弹簧座中部开中心孔， 方便制冷剂流通， 侧孔与弹簧一所处的腔室相连通， 由于弹簧一受挤压时阀块向后 滑动， 挤压弹簧一所处的腔室， 开通侧孔后主要作用是卸荷降压。 由于弹簧座外端大于阀块进口腔， 起阀块限位作用。 而当制冷剂 从弹簧座侧孔中流入到弹簧一所处的腔室时， 将压力作用于阀块 外圆和弹簧侧，所以阀块的形成压力差是本阀进出口差与弹簧力 之和，使得能够阀块始终紧靠挡沿不动。 In the two-way flow expansion valve described above, one end of the spring seat is engaged with the outer casing, and the other end is engaged with the valve body, and the spring seat has a central hole connecting the interface and the inlet cavity, The spring seat is further provided with a side hole connecting the center hole and the outer casing. The spring seat is fixed on the outer casing. Specifically, the inner end of one of the spring seats is engaged with one end of the valve body, and the inner end of the other spring seat is sleeved in the valve body, not only for fixing the valve body. Function, and ensure the margin of thermal expansion and contraction of the valve body. The spring is set on the outer side of the spring seat, and the central seat of the spring seat opens the center hole to facilitate the circulation of the refrigerant. The side hole communicates with the chamber where the spring is located, and the valve block slides backward when the spring is squeezed, and the spring is squeezed. A chamber is located, and the main function after opening the side holes is unloading and reducing pressure. Since the outer end of the spring seat is larger than the inlet cavity of the valve block, the valve block is limited. When the refrigerant flows from the side hole of the spring seat into the chamber where the spring is located, the pressure acts on the outer circle and the spring side of the valve block, so the pressure difference formed by the valve block is the difference between the inlet and the outlet of the valve and the spring force. And, so that the valve block always stays close to the stop.
在上述所述的双向流通膨胀阀中， 所述的双向阀组件包括两 个固定在阀体内且位于出口一和出口二之间的阀座， 所述的阀腔 中设有能沿着阀腔滑动且与阀座一一相配对的阀芯， 所述的阀腔 中还设有使阀芯具有向阀座移动趋势的弹簧组件， 所述的阀芯与 对应的阀座上均开设有连通阀腔和进口腔的通孔结构。 当流量较 小时， 制冷剂可直接从通孔结构进入到阀腔中， 然后从另一端的 通孔结构中流出； 弹簧组件使阀芯靠向阀座， 当流量较大时， 通 孔结构不足以满足制冷剂的流通， 由于进口腔的压力变大， 阀芯 将被推开， 大部分制冷剂直接从出口一流入到阀体与外壳之间的 间隙中， 推开阀块， 从另一进口腔流出。 In the two-way flow expansion valve described above, the two-way valve assembly includes two valve seats fixed in the valve body between the outlet one and the outlet two, and the valve chamber is provided along the valve chamber. a spool that slides and is paired with the valve seat, and the valve chamber is further provided with a spring assembly for causing the spool to move toward the valve seat, and the valve core is connected to the corresponding valve seat Through hole structure of the valve cavity and the inlet cavity. When the flow rate is small, the refrigerant can directly enter the valve cavity from the through-hole structure and then flow out from the through-hole structure at the other end; the spring assembly causes the valve core to lean against the valve seat, and when the flow rate is large, the through-hole structure is insufficient In order to meet the circulation of the refrigerant, the pressure of the inlet chamber becomes larger, the spool will be pushed open, and most of the refrigerant flows directly from the outlet into the gap between the valve body and the outer casing, pushing the valve block away from the other The inlet cavity flows out.
作为另一种方案， 在上述所述的双向流通膨胀阀中， 所述的 双向阀组件包括两个固定在阀体内且位于出口一和出口二之间的 阀座， 所述的阀腔中设有能沿着阀腔滑动且与阀座一一相配对的 阀芯， 所述的阀腔中还设有使阀芯具有向阀座移动趋势的弹簧组
忏， i3方还的 I伐」心和 I伐」 )坐上升设 ^迕通 I伐」股和迸 U股的通扎菊抅， 在所述的阀腔中还设有连通两个通孔结构的挡管， 挡管连通两端 的通孔结构。 In another aspect, in the bidirectional flow expansion valve described above, the two-way valve assembly includes two valve seats fixed in the valve body and located between the outlet 1 and the outlet 2, wherein the valve chamber is provided a spool having a sliding direction along the valve chamber and paired with the valve seat, wherein the valve chamber is further provided with a spring group for causing the spool to move toward the valve seat 忏, i 3 Fang's I cut "heart and I cut") sit up and set up the 伐 I I 」 」 」 迸 迸 迸 迸 迸 迸 迸 迸 迸 迸 通 通 通 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅 抅The retaining pipe of the hole structure, the retaining pipe connects the through hole structure at both ends.
在上述所述的双向流通膨胀阀中， 所述的阀芯具有圆锥状的 头部， 所述的通孔结构包括阀座上开设有与阀芯头部相匹配的锥 孔， 阀座上还开设有连通锥孔与阀体的进口腔的节流小孔， 所述 的阀芯上开设有连通锥孔与阀腔的节流通道。制冷剂流量微小时， 阀芯可以不动作， 减少弹簧二的频繁动作， 提高了膨胀阀组件的 使用寿命。 In the above-described bidirectional flow expansion valve, the valve body has a conical head, and the through hole structure includes a taper hole formed on the valve seat and matched with the valve core head, and the valve seat is further The throttle hole is connected to the inlet cavity of the valve body and the inlet cavity of the valve body, and the throttle body is provided with a throttle passage connecting the cone hole and the valve cavity. When the flow rate of the refrigerant is small, the spool can not operate, reducing the frequent movement of the spring 2, and improving the service life of the expansion valve assembly.
在上述所述的双向流通膨胀阀中， 作为另一方案， 在所述的 外壳上设有连通两端进口腔的毛细管。 可以进一歩提高制冷剂的 微小流量稳定性， 同时为实现制冷剂的微小流量可变性， 减低阀 座和阀芯金加工难度。 在阀芯和阀座之间增加密封垫， 防止制冷 剂从阀芯和阀座之间泄漏。 在本阀的两进口腔之间设有连通的毛 细管， 通过改变毛细管的大小和长短调节微小流量的大小。 In the above-described bidirectional flow expansion valve, as another aspect, a capillary tube that communicates the inlet chambers at both ends is provided on the outer casing. It is possible to further improve the small flow stability of the refrigerant, and at the same time, to achieve the variability of the small flow rate of the refrigerant, and to reduce the difficulty in processing the valve seat and the valve core. Add a gasket between the valve plug and the seat to prevent refrigerant from leaking between the valve plug and the seat. A capillary tube is connected between the two inlet chambers of the valve, and the size of the small flow is adjusted by changing the size and length of the capillary.
在上述所述的双向流通膨胀阀中， 所述的弹簧组件包括分别 与两个阀芯的尾部相抵靠的弹簧二， 所述的弹簧二套在挡管外， 所述的挡管两端伸入两侧阀芯的节流通道内。 只设置一个弹簧二 就能满足两个阀芯的运行， 而且弹簧二套在挡管外， 使得结构简 单紧凑， 挡管直接插入阀芯的节流通道内， 安装也比较方便。 In the above-described bidirectional flow expansion valve, the spring assembly includes a spring 2 respectively abutting against a tail portion of the two valve cores, and the spring is disposed outside the retaining pipe, and the retaining pipe is extended at both ends. Into the throttle channel on both sides of the spool. Only one spring 2 can be used to meet the operation of the two spools, and the springs are placed outside the retaining tube, which makes the structure simple and compact. The retaining tube is directly inserted into the throttle passage of the spool, and the installation is convenient.
在上述所述的双向流通膨胀阀中， 所述的挡管呈直管状且两 端上具有与能阀芯底部相抵靠的限位结构。 两个阀芯可以相对阀 体独立滑动的， 所以挡管不能与两个阀芯都固连。 因此， 将挡管 也设计成能在节流通道内滑动， 而节流通道也因具备一条较长的 直孔方便挡管滑动。 为了防止挡管一端伸入节流通道太深， 导致 另一端脱出另一阀芯的节流通道， 还需在挡管两端上设置限位结 构； 当两个阀芯距离缩短时， 至少一端的限位结构能与阀芯底部 相抵靠。
¾上还所还的^冋流通膨胀 I伐」干， 方还的限位菊抅1^ ¾ 3¾官 两端具有的向外膨胀的凸起。 In the above-described bidirectional flow expansion valve, the retaining pipe has a straight tubular shape and has a stopper structure on both ends thereof which abuts against the bottom of the spool. The two spools can slide independently of the valve body, so the retaining tube cannot be attached to both spools. Therefore, the retaining pipe is also designed to slide in the throttle passage, and the throttle passage is also provided with a long straight hole to facilitate the sliding of the retaining pipe. In order to prevent one end of the retaining pipe from reaching the throttling passage too deep, causing the other end to escape the throttling passage of the other spool, it is necessary to provide a limit structure on both ends of the retaining pipe; when the distance between the two spools is shortened, at least one end The limit structure can abut against the bottom of the spool. On the 3⁄4, the 冋 冋 膨胀 I I 」 」 」 」 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方 方
作为另一种方案， 在上述所述的双向流通膨胀阀中， 所述的 限位结构包括固定套设在挡管外的套管。 Alternatively, in the above-described bidirectional flow expansion valve, the limiting structure includes a sleeve that is fixedly sleeved outside the retaining tube.
作为另一种方案， 在上述所述的双向流通膨胀阀中， 所述的 限位结构包括悍接固连在挡管两端的挡块。 Alternatively, in the above-described bidirectional flow expansion valve, the limiting structure includes a stopper that is spliced and fixed to both ends of the retaining pipe.
在上述所述的双向流通膨胀阀中， 所述的进口腔处设有过滤 网。 为使本阀能正常工作， 在进口端处设过滤网。 In the above two-way flow expansion valve, a filter mesh is provided at the inlet chamber. In order for the valve to work properly, a filter is placed at the inlet end.
与现有技术相比， 本双向流通膨胀阀具有以下优点： Compared with the prior art, the two-way flow expansion valve has the following advantages:
1.整个阀门的组装可以完全不需悍接，只采用滚槽固定即可， 安装比较方便。 1. The assembly of the whole valve can be completed without any splicing, and only the rolling groove can be used for fixing, and the installation is convenient.
2.单向阀组件和双向阀组件处于同一外壳内， 体积较小， 结 构紧凑， 稳定性较好， 不容易发生泄漏。 2. The one-way valve assembly and the two-way valve assembly are in the same housing, the volume is small, the structure is compact, the stability is good, and leakage is not easy.
3.当制冷剂流量较小时， 阀芯可以不动作， 可直接从双向阀 组件上的通孔结构中通过， 减少弹簧组件的频繁动作以及阀芯与 阀座间的摩擦， 提高了膨胀阀的使用寿命。 3. When the flow rate of the refrigerant is small, the spool can not move, and can directly pass through the through-hole structure on the two-way valve assembly, reducing the frequent movement of the spring assembly and the friction between the valve core and the valve seat, and improving the expansion valve Service life.
4. 通过在两端的进口腔之间设有外挂毛细管， 可以降低阀芯 阀座的金加工难度， 并且很容易实现微小流量变动。 附图说明 4. By providing an external capillary between the inlet chambers at both ends, it is possible to reduce the difficulty of gold processing of the valve seat, and it is easy to achieve small flow fluctuations. DRAWINGS
图 1是本实施例一双向流通膨胀阀结构剖视图。 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing the structure of a bidirectional flow expansion valve of the present embodiment.
图 2是本实施例一阀芯阀座的结构示意图。 2 is a schematic view showing the structure of a valve plug valve seat of the embodiment.
图 3是实施例二的结构示意图。 3 is a schematic structural view of Embodiment 2.
图中， 1、 外壳； l a、 接口； lb、 挡沿； 2、 阀体； 2a、 阀腔； 2b、 进口腔； 2c、 出口二； 2d、 出口一； 3、 弹簧座； 3a、 中心孔； 3b、 侧孔； 4、 阀块； 5、 挡圈； 6、 弹簧一； 7、 阀座； 7a、 锥孔； 7b、 节流小孔； 8、 阀芯； 8a、 节流通道； 9、 挡管； 9a、 凸起； 10、 弹簧二； 1 1、 垫圈； 12、 毛细管。
具体实施方式 In the figure, 1, outer casing; la, interface; lb, retaining edge; 2, valve body; 2a, valve cavity; 2b, inlet cavity; 2c, outlet 2; 2d, outlet one; 3. spring seat; 3a, center hole 3b, side hole; 4, valve block; 5, retaining ring; 6, spring one; 7, valve seat; 7a, tapered hole; 7b, throttle small hole; 8, valve core; 8a, throttle channel; , retaining tube; 9a, raised; 10, spring two; 1 1, washer; 12, capillary. detailed description
以下是本发明的具体实施例并结合附图， 对本发明的技术方 案作进一歩的描述， 但本发明并不限于这些实施例。 The following is a description of the technical solutions of the present invention, and the present invention is not limited to the embodiments.
如图 1所示， 本双向流通膨胀阀为呈对称结构， 包括呈直筒 状具有两个进口腔 2b的阀体 2， 阀体 2内设有双向阀组件一和双 向阀组件二， 双向阀组件一的阀腔 2a和双向阀组件二的阀腔 2a 相连通。 双向阀组件一的出口一 2 d和双向阀组件二的进口腔 2b 之间设有使制冷剂从出口一 2 d流入到进口腔 2b流出的单向阀组 件一， 双向阀组件二的出口一 2d和双向阀组件一的进口腔 2b之 间使制冷剂从出口一 2 d流入到进口腔 2 b流出的单向阀组件二。 双向阀组件一和双向阀组件二结构相同， 单向阀组件一和单向阀 组件二结构相同。本双向流通膨胀阀还包括具有两个接口 l a的外 壳 1， 两个接口分别与双向阀组件一和双向阀组件二的进口腔 2b 相连通， 单向阀组件一和单向阀组件二分别具有与进口腔相连通 的出口二 2c， 所述的出口一 2 d和出口二 2c均开设在阀体 2的侧 壁上。 As shown in FIG. 1 , the bidirectional flow expansion valve has a symmetrical structure, and includes a valve body 2 having two inlet chambers 2b in a straight cylindrical shape. The valve body 2 is provided with a two-way valve assembly 1 and a two-way valve assembly 2, and a two-way valve assembly. A valve chamber 2a is in communication with the valve chamber 2a of the two-way valve assembly 2. A check valve assembly 1 is provided between the outlet of the two-way valve assembly 1 and the inlet chamber 2b of the two-way valve assembly 2, and a one-way valve assembly for allowing the refrigerant to flow from the outlet to the inlet chamber 2b for an interval of 2 d, and an outlet of the two-way valve assembly 2 2d and the inlet chamber 2b of the two-way valve assembly 1 allow the refrigerant to flow from the outlet for a period of 2 d to the check valve assembly 2 of the inlet chamber 2 b. The two-way valve assembly has the same structure as the two-way valve assembly, and the one-way valve assembly has the same structure as the one-way valve assembly. The bidirectional flow expansion valve further comprises a casing 1 having two interfaces la, the two interfaces respectively communicating with the two-way valve assembly and the inlet chamber 2b of the two-way valve assembly 2, the one-way valve assembly and the one-way valve assembly 2 respectively having An outlet 2c, which is in communication with the inlet chamber, is formed on the side wall of the valve body 2 by the outlet 2d and the outlet 2c.
具体来说， 单向阀组件一 /单向阀组件二包括固定在接口 l a 处的弹簧座 3和套在阀体 2外侧且能沿着阀体 2外侧滑动的阀块 4。 弹簧座 3—端与外壳 1相卡嵌， 另一端与阀体 2相卡嵌， 本实 施例中的弹簧座 3是通过对外壳 1或阀体 2进行滚槽加工方法而 固定的。 弹簧座 3具有连通接口 l a与进口腔 2b的中心孔 3a， 弹 簧座 3上还开设有连通中心孔 3a与外壳 1体的侧孔 3b。 外壳 1 相对出口一 2d和出口二 2c之间的内壁上具有凸出的呈环形的挡 沿 l b， 挡沿 lb也是通过滚槽方式生成。 挡沿 lb与阀块 4之间设 有挡圈 5， 弹簧座 3与挡圈 5之间设使阀块 4具有向挡圈 5移动 趋势的弹簧一 6， 且当阀块 4与挡沿 lb相抵靠时阀块 4能将出口 二 2 c挡住。 阀块 4采用硬度低于阀体材料的材料制成， 套在阀体
2 外侧， S圈 b外侧囬与外宄 1 的円壁紧紧 ffl诋霏， S圈 b 円 仝 大于阀体 2外径， 所以挡圈 5与阀体 2不接触。 Specifically, the one-way valve assembly/one-way valve assembly 2 includes a spring seat 3 fixed at the interface la and a valve block 4 that is sleeved outside the valve body 2 and slidable along the outside of the valve body 2. The spring seat 3 - end is engaged with the outer casing 1 and the other end is engaged with the valve body 2, and the spring seat 3 in this embodiment is fixed by performing the groove processing method on the outer casing 1 or the valve body 2. The spring seat 3 has a central hole 3a connecting the interface la and the inlet chamber 2b, and the spring seat 3 is further provided with a side hole 3b communicating with the center hole 3a and the outer casing 1 body. The outer wall 1 has a convex annular end lb on the inner wall between the outlet 2d and the outlet 2c, and the rib lb is also formed by the rolling groove. A retaining ring 5 is disposed between the retaining edge lb and the valve block 4, and a spring 6 is provided between the spring seat 3 and the retaining ring 5 so that the valve block 4 has a tendency to move toward the retaining ring 5, and when the valve block 4 and the retaining edge lb The valve block 4 can block the outlet 2c when it is against. The valve block 4 is made of a material having a lower hardness than the valve body material, and is sleeved on the valve body. 2 On the outside, the outer side of the S-ring b is close to the wall of the outer cymbal 1 and the S-ring b is larger than the outer diameter of the valve body 2, so the retaining ring 5 does not contact the valve body 2.
如图 1、 图 2所示， 双向阀组件包括两个固定在阀体 2 内且 位于进口 2c和出口 2d之间的阀座 7， 阀腔 2a中设有能沿着阀腔 2a滑动且与阀座 7——相配对的阀芯 8。阀腔 2a中还设有使阀芯 8具有向阀座 7移动趋势的弹簧组件。 阀芯 8和阀座 7上开设有 连通阀腔 2a和进口腔 2b的通孔结构，在阀腔 2a中还设有连通两 个通孔结构的挡管 9， 挡管 9 呈直管状且两端上具有与能阀芯 8 底部相抵靠的限位结构， 本实施例的限位结构为挡管 9两端向外 膨胀的凸起 9a。 当然， 挡管 9的限位结构也可以用固定套设在挡 管外的套管或悍接固连在挡管两端的挡块代替。 阀芯 8具有圆锥 状的头部， 通孔结构包括阀座 7上开设有与阀芯 8头部相匹配的 锥孔 7a， 阀座 7上还开设有连通锥孔 7a与阀体 2的进口腔 2b的 节流小孔 7b， 阀芯 8上开设有连通锥孔 7a与阀腔 2 a的节流通道 8a。 本实施例中的弹簧组件包括分别与两个阀芯 8的尾部相抵靠 的弹簧二 10， 弹簧二 10套在挡管 9外， 挡管 9两端伸入两侧阀 芯 8的节流通道 8a内。 As shown in Fig. 1 and Fig. 2, the two-way valve assembly includes two valve seats 7 fixed in the valve body 2 between the inlet 2c and the outlet 2d. The valve chamber 2a is provided with a sliding portion along the valve chamber 2a and Seat 7 - paired spool 8. Also provided in the valve chamber 2a is a spring assembly that causes the spool 8 to move toward the valve seat 7. The valve body 8 and the valve seat 7 are provided with a through hole structure communicating with the valve chamber 2a and the inlet chamber 2b, and a valve tube 9 communicating with the two through hole structures is further disposed in the valve chamber 2a, and the blocking tube 9 is straight tubular and two The end has a limiting structure abutting against the bottom of the energy-saving valve core 8. The limiting structure of the embodiment is a protrusion 9a which is outwardly expanded at both ends of the blocking tube 9. Of course, the limiting structure of the retaining pipe 9 can also be replaced by a sleeve that is fixedly sleeved outside the retaining pipe or a retaining block that is fixedly attached to both ends of the retaining pipe. The valve body 8 has a conical head portion, and the through hole structure includes a taper hole 7a formed on the valve seat 7 to match the head of the valve body 8, and the valve seat 7 is further provided with a communicating cone hole 7a and the valve body 2 The throttle hole 7b of the oral cavity 2b has a throttle passage 8a connecting the tapered hole 7a and the valve chamber 2a. The spring assembly in this embodiment includes springs 20 respectively abutting the tail portions of the two valve cores 8, and the springs 20 are disposed outside the retaining pipe 9, and the throttle pipes 9 extend into the throttling passages of the valve cores 8 on both sides. Within 8a.
在外壳 1的接口 l a处加装过滤网， 以便本阀正常工作。 本阀 工作原理如下： Install a filter at the interface l a of the outer casing 1 so that the valve works normally. The working principle of this valve is as follows:
在制冷剂流量较小时， 从接口 l a进入到进口腔 2b， 由于流 量较小， 固不能推开阀芯 8， 只能从阀座 7的节流小孔 7b流入， 由于阀芯 8阀座 7相抵靠， 所以出口一 2d被阀芯 8挡住， 无法流 入到外壳 1 与阀体 2 的间隙中， 只能经过阀芯 8 的节流通道 8a 后进入到挡管 9 中， 挡管 9另一端与另一阀芯 8 的节流通道 8a 相连通， 再经过节流小孔 7b流出本阀。制冷剂反向流入也是经过 同一条通道。 When the refrigerant flow rate is small, from the interface la to the inlet chamber 2b, since the flow rate is small, the valve core 8 cannot be pushed open, and can only flow in from the throttle hole 7b of the valve seat 7, due to the valve seat 8 of the valve body 8 Abutting, the outlet 2d is blocked by the valve core 8 and cannot flow into the gap between the outer casing 1 and the valve body 2, and can only enter the retaining pipe 9 through the throttle passage 8a of the spool 8, and the other end of the retaining pipe 9 It communicates with the throttle passage 8a of the other spool 8, and then flows out of the valve through the orifice 7b. The reverse flow of refrigerant also passes through the same channel.
随着制冷剂的流量不断增大， 进口腔 2b的压力也逐渐增大， 当制冷剂流量增大到预设值时，由于节流小孔 7b的直径较小而无
法满疋 ：重的制 ^刑涌入叮， I伐」心 8傲 升， 彈黄二 Ιϋ ^:价 。 而阀体 2侧壁的出口一 2d也处于打开状态， 制冷剂从出口一 2d 流入到阀体 2与外壳 1的间隙中。 阀体 2与外壳 1 的间隙由于单 向阀组件一的阀块 4存在， 所以必须推开阀块 4才能经过出口二 2c进入到进口腔 2b中。 另一端的阀块 4 由于两侧压力不平衡， 导致阀块 4被推开， 制冷剂进入到另一端的进口腔 2b， 从而排出 本阀； 而这一端的阀块 4由于其两侧压力平衡， 所以不会被推开， 制冷剂不会返回原来的进口腔 2b。 As the flow rate of the refrigerant continues to increase, the pressure of the inlet chamber 2b also gradually increases. When the refrigerant flow rate increases to a preset value, since the diameter of the orifice small hole 7b is small, no The law is full: the heavy system is poured into the shackles, and the I cuts the heart 8 arrogant, and the yellow Ιϋ Ιϋ ^: price. The outlet 2d of the side wall of the valve body 2 is also in an open state, and the refrigerant flows from the outlet 2d into the gap between the valve body 2 and the outer casing 1. Since the gap between the valve body 2 and the outer casing 1 is present due to the valve block 4 of the one-way valve assembly, the valve block 4 must be pushed open to enter the inlet chamber 2b through the outlet 2c. The valve block 4 at the other end is unbalanced on both sides, causing the valve block 4 to be pushed open, and the refrigerant enters the inlet chamber 2b at the other end, thereby discharging the valve; and the valve block 4 at this end is balanced by pressure on both sides thereof. , so it will not be pushed open, the refrigerant will not return to the original inlet cavity 2b.
实施例二 Embodiment 2
如图 3所示， 当然也可以取消阀芯 8与阀座 7之间连通阀腔 2a和进口腔 2b的通孔结构， 在阀芯 8上套连有垫圈 1 1， 提高密 封效果， 不管大小流量制冷剂都从阀芯 8推开的间隙中通过。 至 于怎么实现制冷剂的微量平衡，可以将阀体 2的进口腔 2 b直接通 过毛细管 12相连， 毛细管 12的两端可以设在弹簧座 3所在的型 腔壁上， 也可以设在接口 l a处。 另外， 为了避免阀体 2及外壳 1 受到外力的碰撞而变形， 可以在外壳 1外围加装防护罩， 起到保 护作用。 As shown in FIG. 3, of course, the through hole structure connecting the valve body 8 and the valve seat 7 to the valve chamber 2a and the inlet chamber 2b can be eliminated, and the gasket 1 is sleeved on the valve core 8 to improve the sealing effect regardless of the size. The flow refrigerant passes through the gap pushed away by the spool 8. As for how to realize the microbalance of the refrigerant, the inlet chamber 2b of the valve body 2 can be directly connected through the capillary tube 12. The two ends of the capillary tube 12 can be disposed on the cavity wall where the spring seat 3 is located, or can be disposed at the interface la. . In addition, in order to prevent the valve body 2 and the outer casing 1 from being deformed by the impact of an external force, a protective cover may be attached to the outer periphery of the outer casing 1 for protection.
本文中所描述的具体实施例仅仅是对本发明精神作举例说 明。 本发明所属技术领域的技术人员可以对所描述的具体实施例 做各种各样的修改或补充或采用类似的方式替代， 但并不会偏离 本发明的精神或者超越所附权利要求书所定义的范围。
The specific embodiments described herein are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.