WO2022007589A1 - 一种电动阀及电动阀的装配方法 - Google Patents

一种电动阀及电动阀的装配方法 Download PDF

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Publication number
WO2022007589A1
WO2022007589A1 PCT/CN2021/099610 CN2021099610W WO2022007589A1 WO 2022007589 A1 WO2022007589 A1 WO 2022007589A1 CN 2021099610 W CN2021099610 W CN 2021099610W WO 2022007589 A1 WO2022007589 A1 WO 2022007589A1
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WO
WIPO (PCT)
Prior art keywords
valve
valve seat
sealing
bushing
wall
Prior art date
Application number
PCT/CN2021/099610
Other languages
English (en)
French (fr)
Inventor
吕铭
丁良妹
Original Assignee
浙江三花制冷集团有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 浙江三花制冷集团有限公司 filed Critical 浙江三花制冷集团有限公司
Priority to KR1020227037053A priority Critical patent/KR20220156944A/ko
Priority to JP2022552444A priority patent/JP7413559B2/ja
Publication of WO2022007589A1 publication Critical patent/WO2022007589A1/zh

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Classifications

    • 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
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings
    • 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
    • F16K1/02—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 with screw-spindle
    • 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
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • 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
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • 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
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings
    • F16K1/465—Attachment of sealing rings to the valve seats

Definitions

  • the invention relates to the technical field of fluid control, in particular to an electric valve and an assembly method of the electric valve.
  • FIG. 1 is a schematic diagram of a partial structure of an electric valve in the background art.
  • the electric valve includes a valve body 100 , a guide sleeve 200 of the valve core disposed in the valve body 100 and fixed with the valve body 100 by welding, a valve core 300 made of metal material, a plastic nut 400 , and the gap between the valve core 300 and the guide sleeve 200
  • a sealing assembly 500 is provided, the part of the valve core 300 located on the lower side of the sealing assembly 500 is slidably matched with the guide sleeve 200 , and the valve core 300 can slide axially relative to the guide sleeve 200 under the driving of the nut 400 to abut against the sealing member 700 or separation.
  • the annular flange portion 1000 of the valve seat 900 includes a valve port 901, the sealing member 700 is in an interference fit with the inner sleeve 800, and the inner sleeve 800 and the valve seat 900 are welded and fixed.
  • the valve core 300 is in the fluid Under the action of pressure, there is a risk of skewing and warping. Since the sealing member 700 is directly in contact with the valve core 300, the deformation amount of the sealing member 700 after being pressed is sometimes not enough to offset the warping amount of the valve core 300, resulting in the valve closing when the valve is closed. The lower end of the core 300 and the sealing member 700 are not in complete contact, which affects the valve closing reliability of the electric valve. Therefore, there is room for improvement in the valve closing reliability of the electric valve.
  • the purpose of this application is to provide an electric valve to improve the valve closing reliability of the electric valve.
  • An electric valve provided by the present application includes a valve seat part and a valve core part, the valve seat part includes a valve seat and a sealing member, the sealing member includes a first member and a second member, and the first member includes a sealing member
  • the sealing part is made of plastic
  • the second member is made of elastic material
  • the second member is arranged between the first member and the valve seat, and the second member is connected to the valve seat.
  • the first member and the valve seat elastically abut
  • the valve core component includes a valve core
  • the valve core can move axially relative to the valve seat
  • the valve core includes an annular portion
  • the lower end of the annular portion It can abut or separate from the sealing portion.
  • the sealing member includes a first member and a second member, the sealing portion of the first member is made of plastic, the second member is made of an elastic material, and the second member is provided on the Between the first member and the valve seat, the second member is in elastic contact with the first member and the valve seat, so that the valve closing reliability of the electric valve can be improved.
  • the electric valve includes a valve seat part and a valve core part
  • the valve seat part includes a valve seat, a sealing member, and a bushing
  • the valve seat comprising a sealing member mounting portion
  • the bushing comprising radial projections
  • the sealing member comprising a first member and a second member
  • the first member comprising a sealing portion
  • the sealing portion being made of plastic
  • the The second member is made of an elastic material
  • the bushing is annular
  • the valve core part includes a valve core
  • the valve core includes an annular portion
  • the assembling method includes: attaching the first member to the first member.
  • the two components are assembled to form the sealing member; the assembled sealing member is sleeved on the outside of the bushing, so that the radial protrusion is located on the upper side of the sealing member to form a first pre-installed part; The sealing member of the first pre-assembled component is placed on the sealing member mounting portion, and then the bushing and the valve seat are fixedly connected.
  • FIG. 1 is a schematic diagram of a partial structure of an electric valve in the background art
  • FIG. 2 is a schematic structural diagram of a specific embodiment 1 of the electric valve of the present invention.
  • Fig. 3 is a schematic structural diagram of the valve seat in Fig. 2 before being fixed with the valve body;
  • Fig. 4 is a partial enlarged view at I place in Fig. 2;
  • Figure 5 is a schematic structural diagram of the first member in Figure 2;
  • FIG. 6 is a schematic structural diagram of the limiting member in FIG. 2;
  • Figure 7 shows a schematic structural diagram of the bushing in Figure 2;
  • Figure 8 shows a partial enlarged view at I when a bushing of another structure is used
  • FIG. 9 is a partial enlarged view of I 1 in FIG. 8 .
  • orientation words such as “up” and “lower”, etc.
  • orientation words are based on the positions shown in the drawings in this specification, it should be understood that the use of the orientation words is only for the purpose of The clarity and convenience of describing the technical solution should not limit the scope of protection.
  • valve port herein refers to the valve port that determines the flow area of the fluid between the first fluid port and the second fluid port when the electric valve is at the maximum valve opening position.
  • FIG. 2 shows a schematic structural diagram of a specific embodiment 1 of the electric valve of the present invention
  • Fig. 3 shows a structural schematic diagram of the valve seat in Fig. 2 before being fixed with the valve body
  • Fig. 4 shows a part of part I in Fig. 2 Enlarged view
  • FIG. 5 is a schematic structural diagram of the first member in FIG. 2
  • FIG. 6 is a structural schematic diagram of the stopper in FIG. 2
  • FIG. 7 is a structural schematic diagram of the bushing in FIG. 2 .
  • the electric valve includes a valve seat part 10 , a valve body part 30 , and a valve core part 20 .
  • the valve body part 30 includes a valve body 31 , the valve body 31 is provided with a second fluid port 40 , and the second connecting pipe B extends into the second fluid port 40 and is welded with the valve body 31 .
  • the valve seat member 10 includes a valve seat 11 and a sealing member 12 .
  • the valve seat 11 and the valve body 31 are welded and fixed.
  • FIG. 2 is only a specific embodiment of the technical solution of the present application, and the valve seat 11 and the valve body 31 may also be of an integrated structure. In this case, the integrated structure is equivalent to the claims. "Valve Seat" in .
  • the valve seat 11 includes a sealing member mounting portion 111, the sealing member 12 is located at the sealing member mounting portion 111, the sealing member 12 includes a first member 121 and a second member 122, the first member 121 is annular, and the annular here refers to,
  • the first member 121 has an axial through hole instead of a solid body, including but not limited to structures such as a ring, a cylinder, a ring with a flange or a cylinder.
  • the first member 121 includes a sealing portion 1211, and the sealing portion 1211 is made of a non-metal wear-resistant material.
  • the sealing portion 1211 of the first member 121 is specifically made of plastic. In this embodiment, the entire first member 121 is made of plastic.
  • the sealing portion 1211 of the first member 121 can also be composed of plastic and other materials; the second member is made of elastic material, such as thermoplastic elastomer, specifically, the second member 122 is made of rubber, For example, it is made of HNBR or CR, or the second member 122 is made of TPE and thermoplastic elastomer with equivalent properties.
  • the second member is made of elastic material, such as thermoplastic elastomer, specifically, the second member 122 is made of rubber, For example, it is made of HNBR or CR, or the second member 122 is made of TPE and thermoplastic elastomer with equivalent properties.
  • the second member 122 is disposed between the first member 121 and the valve seat 11 , the second member 122 and the first member 121 abut against the valve seat 11 , the valve core part 20 includes a valve core 21 , and the valve core 21 can be relative to the valve seat 11 moves axially, the valve core 21 includes an annular portion 211 , and the lower end of the annular portion 211 can abut or separate from the sealing portion 1211 .
  • the electric valve also includes a nut 70 and a transmission rod 60 of the driving part.
  • the nut 70 is threadedly connected with the transmission rod 60 , and the valve core 21 can move axially relative to the valve seat 11 under the driving of the transmission rod 60 to abut or separate from the first member 121 .
  • the sealing member 12 includes a first member 121 and a second member 122, the first member 121 is annular, the first member 121 is made of plastic, the second member 122 is made of elastic material, and the first member 121 is annular.
  • the second member 122 is disposed between the first member 121 and the valve seat 11 , and the second member 122 and the first member 121 elastically abut against the valve seat 11 .
  • the elastic deformation of the second member 122 can be used to offset the warping of the valve core 21 caused by the lateral pressure differential force.
  • the lower end of the annular portion 211 of the valve core 21 is completely in contact with the sealing portion 1211.
  • the good wear resistance of the sealing portion 1211 of the first member 121 is used to prevent the wear of the second member 122 when the valve core 21 is in contact with the sealing member 12 and reduce the wear of the first member 121 itself, thereby further improving the sealing member 12. reliability, thereby improving the valve closing reliability of the electric valve.
  • the first member 121 has a certain rigidity, which can reduce the risk of upward recoil failure of the second member 122 under the impact of fluid pressure.
  • the above-mentioned first member 121 is made of PTFE material
  • the second member 122 is made of rubber material. Due to the inevitable assembly gap between each component, for example, there is a gap between the nut 70 and the transmission rod 60, the rubber material itself. It has thermal expansion and contraction performance, and can accommodate the change of the axial stroke of the valve core 21 caused by the aforementioned gap.
  • the first member made of PTFE material has wear resistance, and the first member 121 and the second member 122 cooperate together, which is conducive to improving The valve closing reliability of the electric valve. Further, as shown in FIG. 2 , FIG. 4 and FIG.
  • the valve seat part 10 further includes a bushing 14 , the bushing 14 is annular, the sealing member 12 is sleeved on the outside of the bushing 14 , and the bushing 14 includes a valve port 141, the bushing 14 is fixedly connected with the valve seat 11, the valve seat 11 includes a first fluid port 30, the first fluid port 30 is always in communication with the valve port 141, and the first pipe A extends into the first fluid port 30 and is welded with the valve seat 11 fixed. The first fluid port 30 is always in communication with the valve port 141.
  • the second fluid port 40 When the lower end of the annular portion 211 of the valve core 21 is in contact with the first member 121, the second fluid port 40 is not communicated with the valve port 141, and the lower end of the annular portion 211 is in contact with the first member 121. When the member 121 is disengaged, the second fluid port 40 communicates with the valve port 141 .
  • the sealing member 12 is sleeved on the outer side of the bushing 14, the bushing 14 is fixedly connected with the valve seat 11, the bushing 14 limits the circumferential direction of the sealing member 12, and the valve port 141 is formed on the bushing 14, so that the valve The port is easy to process, and the valve port 141 is provided on the bushing 14 (that is, the bushing 14 itself has the valve port 141 ), so that the entire flow channel can be smoother, and it is easier to control the electric valve to meet the required flow curve requirements. Furthermore, opening the valve port on the bushing 14 also facilitates the serialization of the diameter of the electric valve (the minimum flow rate of the inner hole of the bushing 14), that is, by setting the shape and size of the inner wall of the bushing 14, it can be changed. The diameter and flow curve of the valve port of the electric valve do not need to change the structure and size of the valve seat 11 .
  • the thickness of the portion of the sealing portion 1211 in direct contact with the valve core 21 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm, to further ensure the strength of the first member 121 is reliable and improve the sealing reliability of the electric valve.
  • the valve seat component 10 further includes a limiting member 13 , the limiting member 13 is annular, and the limiting member 13 is fixedly connected with the valve seat 11 .
  • the assembling method of the electric valve includes: assembling the first member 121 and the second member 122 to form the sealing member 12 ; sheathing the assembled sealing member 12 on the outside of the bushing 14 to form a first pre-installed part; The sealing member 12 to which the components are mounted is located at the sealing member mounting portion 111 , and thereafter, the bushing 14 is fixedly connected to the valve seat 11 .
  • the first member 121 further includes an annular sleeve portion 1212
  • the second member 122 is sleeved on the sleeve portion 1212
  • the valve seat 11 includes a first stepped hole 113 , a second stepped hole 114 and a third stepped hole 115 .
  • the structure of the valve seat 11 before being fixedly connected with the limiting member 13 is shown in FIG. 3 .
  • the first stepped hole 113 includes a first bottom wall 1131 and a first side wall 1132
  • the second stepped hole 114 includes a second bottom wall 1141 and a second side wall 1142
  • the third stepped hole 115 includes a third bottom wall 1151 and a third Sidewall 1152.
  • the inner diameter of the first side wall 1132 (ie, the diameter of the first stepped hole 113 ) is smaller than the inner diameter of the second side wall 1142 (ie, the diameter of the second stepped hole).
  • the inner diameter of the third side wall 1152 (when the valve seat is used as a separate part in FIG. 3 ) is smaller than the diameter of the second stepped hole 114 .
  • the second bottom wall 1141 of the second stepped hole 114 serves as the sealing member mounting portion 111 . After the sealing member 12 is located in the sealing member mounting portion 111 , the limiting member 13 is partially seated on the third bottom wall 1151 of the valve seat 11 , and a part is located on the third bottom wall 1151 of the valve seat 11 .
  • the third side wall 1152 of the valve seat 11 and the limiting member 13 are riveted and fixed on the first member 121 .
  • the lower end of the annular portion 211 of the valve core 21 can abut or separate from the sealing portion 1211 .
  • the sealing member 12 is axially limited relative to the valve seat 11 to further ensure that the sealing member 12 does not come out of the valve seat 11 in the axial direction.
  • the inner diameter of the lower end of the stopper 13 and the outer diameter of the radial protrusion 145 of the bushing 14 can be controlled. The better the effect.
  • the electric valve of this solution is applied to a system.
  • the second member 122 made of rubber is soaked and swelled by a refrigerant, and a refrigerant will be accumulated between the second member 122 and the valve seat 11, and the refrigerant will be stored here. , which is not conducive to the deformation of the second member 122 with the force of the valve core 21 , and affects the sealing reliability of the electric valve. In order to improve this, as shown in FIG. 2 and FIG.
  • a first discharge passage X1 is included between the second member 122 and the inner wall of the valve seat 11 , and a space between the sealing portion 1211 of the first member 121 and the inner wall of the valve seat 11 is included. It includes a second discharge passage X2, and the limiting member 13 includes a third discharge passage X3. The first discharge passage X1, the second discharge passage X2, the third discharge passage X3, and the second fluid port 40 are connected in sequence.
  • a transition portion 160 is further included between the second stepped hole 114 and the third stepped hole 115 , the inner wall of the transition portion 160 is trumpet-shaped, and the first end of the transition portion 160 is connected to the third stepped hole 151
  • the second end of the transition portion 160 is connected to the second side wall 1412 of the second stepped hole 141 , and the aperture of the first end of the transition portion 160 is larger than the aperture of the second end of the transition portion 160 .
  • Transition portion 160 is formed between the outer wall of the first member 121 to the transition path X through the first discharge passage X1, a second discharge passage X2, X through the transition path, the third discharge passage communicates sequentially X3. X transition passage through the second fluid discharge passage from the discharge passage into the third X2 X3 more smoothly.
  • the bushing 14 includes a body portion 140 , a radially protruding portion 145 and a lower fixing portion 146 , and the radially protruding portion 145 radially protrudes relative to the body portion 140 .
  • the maximum outer diameter of the radial protrusions 145 is greater than the maximum outer diameter of the body portion 140 .
  • the radial protrusions 145 are located on the upper side of the first member 121, and the radial protrusions 145 limit the axial displacement of the sealing member on the valve seat 11, that is, limit the separation of the sealing member from the valve seat 11 (detachment refers to any part of the sealing member).
  • the outer wall of the body portion 140 is in an interference fit with the inner wall of the first member 121 , which is equivalent to forming another surface seal between the first member 121 and the bushing 14 .
  • the radially protruding portion 145 is located on the upper side of the first member 121 , and the radially protruding portion 145 abuts against the sealing portion 1211 to press the inner edge of the first member 121 .
  • the inner and outer edges of the first member 121 are pressed, so that the force on the first member 11 is relatively uniform, and the sealing member 12 is prevented from being recoiled upwards by the fluid pressure, causing the sealing member to fail.
  • the lower fixing portion 146 protrudes from the lower end of the valve seat 11
  • the lower fixing portion 146 and the valve seat 11 are riveted and fixed to limit the sealing member 12 on the valve seat 11 , that is, the cooperation between the lower fixing portion and the radially protruding portion will seal the sealing member. limited to the valve seat.
  • riveting fixing is adopted here instead of welding fixing is that it is more convenient and easy to perform riveting fixing than welding, and in the riveting process, it can be well controlled by controlling the riveting pressure and the pressing depth. Guaranteed fixed reliability. If the bushing 14 is fixed reliably, the connection reliability between the sealing member and the valve seat is improved, and the valve closing reliability of the electric valve can be improved compared with the background art.
  • the outer wall of the radial protrusion 145 includes a straight section 1451 and an inclined section 1452, the cross section of the inclined section 1452 is circular, and the outer diameter of the inclined section 1452 extends from the end connected with the straight section 1451 to the distance away from the straight section 1451.
  • One end is tapered, and the inner wall of the annular portion 211 of the valve core 21 can cooperate with the inclined plane section to adjust the flow rate of the electric valve.
  • the annular socket portion 1212 of the first member 121 includes a protruding portion 1220 located between the first side wall 1132 of the first stepped hole 113 and the outer wall of the bushing 14 .
  • a fourth discharge passage X4 is included between the outer wall of the 1220 and the first side wall 1132 of the first stepped hole 113, and a fifth discharge passage X5 is included between the lower end of the extending portion 1220 and the outside of the first bottom wall 1131 of the first stepped hole,
  • the wall portion of the bushing 14 includes a radial through hole X6, and the fourth discharge passage X4, the fifth discharge passage X5, the radial through hole X6, and the first fluid port 30 are communicated in sequence, so that the inner side of the second member 122 once the refrigerant is accumulated be released in time.
  • the inner wall of the second member 122 is in interference fit with the outer wall of the annular socket portion 1212 , so that a surface seal is formed between the second member 122 and the first member 121 , which is beneficial for electric Valve closing reliability.
  • the sealing portion 1211 of the first member 121 further includes an annular flange portion 1210 protruding downward, and the second member 122 is at least partially located between the annular flange portion 1210 and the socket portion 1212, so the second member 122 seals the first member.
  • the cover 121 is set, the second member 122 is clamped on the first member 121 , and the first member 121 has a limiting effect on the radial displacement and the axial displacement of the second member 122 .
  • the gap between the annular flange portion 1210 and the inner wall of the valve seat 11 is used as the second discharge passage X2, the limiting member 13 includes an axial through hole, and the axial through hole is used as the third discharge passage X3, and the structural design of each discharge passage is simple .
  • Fig. 8 shows a partial enlarged view of position I when a bushing 14A of another structure is used
  • Fig. 9 shows a partial enlarged view of position I 1 in Fig. 8 .
  • the bushing 14 includes a guide section 1401, the guide section 1401 is in the shape of a frustum and is located on the lower side of the sealing member 12, and the guide section 1401 is closer to one end of the lower fixing portion 146.
  • the outer diameter is smaller than the outer diameter of the end closer to the radial protrusion 145 , and the guide section 1401 plays a guiding role when the sealing member 12 is sleeved to the bushing 14 , and after the sealing member 12 is sleeved to the bushing 14 , Axial play of the seal member 12 relative to the bushing 14 can be improved or prevented.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

一种电动阀，包括阀座部件（10）和阀芯部件（20），阀座部件（10）包括阀座（11）、密封构件（12），密封构件（12）包括第一构件（121）和第二构件（122），第一构件（121）包括密封部（1211），密封部（1211）由塑料制成，第二构件（122）由橡胶制成，第二构件（122）设置于第一构件（121）与阀座（11）之间，第二构件（122）与第一构件（121）、阀座（11）弹性抵接，阀芯部件（20）包括阀芯（21），阀芯（21）能够相对于阀座（11）轴向移动，阀芯（21）包括环形部（211），环形部（211）的下端能够与密封部（1211）抵接或分离。还提供了一种电动阀的装配方法。

Description

一种电动阀及电动阀的装配方法
本申请要求于2020年07月09日提交中国专利局、申请号为202010655378.0、发明名称为“一种电动阀及电动阀的装配方法”以及于2021年01月05日提交中国专利局、申请号为202110008747.1、发明名称为“一种电动阀及电动阀的装配方法”的两件中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及流体控制技术领域，特别是涉及一种电动阀及电动阀的装配方法。
背景技术
图1所示为背景技术一种电动阀的局部结构示意图。该电动阀包括阀体100、设置于阀体100内并与阀体100焊接固定的阀芯的导向套200、金属材料制的阀芯300、塑料螺母400，阀芯300与导向套200之间设置有密封组件500，阀芯300的位于密封组件500下侧的部分与导向套200滑动配合，阀芯300在螺母400的带动下能够相对于导向套200轴向滑动以与密封件700抵接或分离。阀座900的环状凸缘部1000包括阀口901，密封件700与内套800过盈配合，内套800与阀座900焊接固定，该电动阀在实际使用过程中，阀芯300在流体压力作用下有产生歪斜翘起的风险，由于密封件700直接与阀芯300抵接，密封件700受压后的变形量有时不足以抵消掉阀芯300的翘起量，导致关阀时阀芯300的下端与密封件700之间未完全接触，影响电动阀的关阀可靠性，因此，电动阀的关阀可靠性有改善空间。
发明内容
本申请的目的是提供一种电动阀，改善电动阀的关阀可靠性。
本申请提供的一种电动阀，包括阀座部件和阀芯部件，所述阀座部件 包括阀座、密封构件，所述密封构件包括第一构件和第二构件，所述第一构件包括密封部，所述密封部由塑料制成，所述第二构件由弹性材料制成，所述第二构件设置于所述第一构件与所述阀座之间,所述第二构件与所述第一构件、所述阀座弹性抵接，所述阀芯部件包括阀芯，所述阀芯能够相对于所述阀座轴向移动，所述阀芯包括环形部，所述环形部的下端能够与所述密封部抵接或分离。
相比于背景技术，所述密封构件包括第一构件和第二构件，所述第一构件的密封部由塑料制成，所述第二构件由弹性材料制成，所述第二构件设置于所述第一构件与所述阀座之间，所述第二构件与所述第一构件和所述阀座弹性抵接，能够改善电动阀的关阀可靠性。
本申请还提供了一种具有上述技术效果的电动阀的装配方法，所述电动阀包括阀座部件和阀芯部件，所述阀座部件包括阀座、密封构件、衬套，所述阀座包括密封构件安装部，所述衬套包括径向凸出部，所述密封构件包括第一构件和第二构件，所述第一构件包括密封部，所述密封部由塑料制成，所述第二构件由弹性材料制成，所述衬套呈环状，所述阀芯部件包括阀芯，所述阀芯包括环形部，所述装配方法包括：将所述第一构件与所述第二构件组装形成所述密封构件；将组装后的所述密封构件套设于所述衬套的外部，使所述径向凸出部位于所述密封构件上侧，形成第一预装部件；将所述第一预装部件的所述密封构件置于所述密封构件安装部，之后，将所述衬套与所述阀座固定连接。
附图说明
图1所示为背景技术一种电动阀的局部结构示意图；
图2所示为本发明电动阀的具体实施例一的结构示意图；
图3所示为图2中阀座在与阀体固定前的结构示意图；
图4所示为图2中I处的局部放大图；
图5所示为图2中第一构件的结构示意图；
图6所示为图2中限位件的结构示意图；
图7所示为图2中衬套的结构示意图；
图8所示为使用另一结构的衬套时I处的局部放大图；
图9所示为图8中I 1处的局部放大图。
具体实施方式
需要先说明的是，本文中若使用方位词，如“上”和“下”等，均是以本文说明书附图中图示位置为基准定义的，应当理解，所述方位词的使用只是为了描述技术方案的清楚及方便，不应当对保护范围构成限制。
本文中的“阀口”是指在电动阀处于最大开阀位置时，决定了流体在第一流体端口与第二流体端口之间的通流面积，则为阀口。
为了使本技术领域技术人员更好地理解本申请技术方案，下面结合附图和具体实施例对本申请技术方案作进一步的说明。
图2所示为本发明电动阀的具体实施例一的结构示意图，图3所示为图2中阀座在与阀体固定前的结构示意图，图4所示为图2中I处的局部放大图，图5所示为图2中第一构件的结构示意图，图6所示为图2中限位件的结构示意图，图7所示为图2中衬套的结构示意图。
如图2所示,该电动阀包括阀座部件10、阀体部件30、阀芯部件20。阀体部件30包括阀体31，阀体31设置有第二流体端口40，第二接管B伸入第二流体端口40并与阀体31焊接。阀座部件10包括阀座11、密封构件12。阀座11与阀体31焊接固定。此处，需要说明的是，图2仅是本申请技术方案的一个具体实施例，其中的阀座11与阀体31也可以为一体式结构，此时，该一体式结构即相当于权利要求中的“阀座”。
阀座11包括密封构件安装部111，密封构件12位于密封构件安装部111，密封构件12包括第一构件121和第二构件122，第一构件121呈环状，此处的环状是指，第一构件121在作为零件时，其具有轴向的通孔，而非实心体，包括但不限于圆环、圆筒，带翻边的圆环或圆筒等结构。第一构件121包括密封部1211，密封部1211由非金属耐磨材料制成，第一构件121的密封部1211具体由塑料制成，本实施例中，第一构件121整体由塑料制成，可以理解的是，第一构件121的密封部1211也可以由塑料与其它材质共同组成；第二构件由弹性材料制成，如热塑性弹性体制成，具 体的，第二构件122由橡胶制成，例如由HNBR或CR等制成，或第二构件122由TPE及性能相当的热塑性弹性体制成。第二构件122设置于第一构件121与阀座11之间，第二构件122和第一构件121与阀座11抵接，阀芯部件20包括阀芯21，阀芯21能够相对于阀座11轴向移动，阀芯21包括环形部211，环形部211的下端能够与密封部1211抵接或分离。
该电动阀还包括螺母70、驱动部件的传动杆60。螺母70与传动杆60螺纹连接，阀芯21在传动杆60的带动下能够相对于阀座11轴向移动以与第一构件121抵接或分离。
当电动阀应用于系统中，流体在自电动阀的进口向出口流动时，阀芯21会受到流体的压力差作用，阀芯21有因流体压差力作用发生偏斜导致的电动阀的泄漏风险，本方案的电动阀，密封构件12包括第一构件121和第二构件122，第一构件121呈环状，第一构件121由塑料制成，第二构件122由弹性材料制成，第二构件122设置于第一构件121与阀座11之间，第二构件122和第一构件121与阀座11弹性抵接。如此，在阀芯21相对于阀座11发生偏斜时，由于第二构件122是弹性材料制成，可以利用第二构件122的弹性变形来抵消阀芯21因受横向压差力产生的翘起量，使阀芯21的环形部211的下端与密封部1211完全接触。并且，利用第一构件121的密封部1211的良好耐磨性防止阀芯21与密封构件12抵接时对第二构件122的磨损及降低第一构件121自身受到的磨损，进一步提高密封构件12的可靠性，从而改善电动阀的关阀可靠性。此外，第一构件121具有一定的刚性，其能够降低第二构件122受流体压力冲击发生向上反冲失效风险。
上述第一构件121由PTFE材料制成，第二构件122由橡胶材料制成，由于各零部件之间不可避免的存在装配间隙，例如螺母70与传动杆60之间即存在间隙，橡胶材料本身具有热胀冷缩性能，能够包容因前述间隙导致的阀芯21轴向行程的变化，PTFE材料制成的第一构件具有耐磨性，第一构件121和第二构件122共同配合，利于改善电动阀的关阀可靠性。进一步地，如图2、图4及图7所示，阀座部件10还包括衬套14，衬套14呈环状，密封构件12套设于衬套14的外部，衬套14包括阀口141，衬套14与阀座11固定连接，阀座11包括第一流体端口30，第一流体端口30 与阀口141始终连通，第一接管A伸入第一流体端口30与阀座11焊接固定。第一流体端口30与阀口141始终连通，阀芯21的环形部211的下端与第一构件121抵接时，第二流体端口40与阀口141不连通，环形部211的下端与第一构件121分离时，第二流体端口40与阀口141连通。密封构件12套设在衬套14的外侧，衬套14与阀座11固定连接，衬套14对密封构件12的周向进行限位，并且，阀口141形成在衬套14上，使得阀口加工容易，而且，将阀口141开设在衬套14上(即衬套14自身具有阀口141)，使得整个流道能够更加顺滑，更容易控制电动阀满足需要的流量曲线需求。再者，将阀口开设衬套14上，还便于电动阀口径(衬套14的内孔的最小通流量)的系列化，即通过设置衬套14的内壁的形状及其尺寸，即可改变电动阀的阀口的通径及流量曲线，无需改变阀座11的结构及尺寸。
密封部1211的与阀芯21直接接触的部位的厚度大于等于0.1mm且小于等于0.5mm，以进一步保证第一构件121的强度可靠，提高电动阀的密封可靠性。
如图2和图4及图6所示，阀座部件10还包括限位件13，限位件13呈圆环状，限位件13与阀座11固定连接。该电动阀的装配方法包括：将第一构件121与第二构件122组装形成密封构件12；将组装后的密封构件12套设于衬套14的外部形成第一预装部件；使第一预装部件的密封构件12位于密封构件安装部111，之后，将衬套14与阀座11固定连接。具体地，第一构件121还包括环形的套接部1212，第二构件122套设于套接部1212。阀座11包括第一台阶孔113、第二台阶孔114和第三台阶孔115。其中阀座11在与限位件13固定连接前的结构如图3所示。第一台阶孔113包括第一底壁1131和第一侧壁1132，第二台阶孔114包括第二底壁1141和第二侧壁1142，第三台阶孔115包括第三底壁1151和第三侧壁1152。第一侧壁1132的内径(即第一台阶孔113的孔径)小于第二侧壁1142的内径(即第二台阶孔的孔径)。第三侧壁1152的内径(图3中阀座作为单独零件时)小于第二台阶孔114的孔径。第二台阶孔114的第二底壁1141作为密封构件安装部111，密封构件12位于密封构件安装部111后，将限位件13部分坐落于阀座11的第三底壁1151上，部分位于第一构件121上，之后，将阀座11的第三侧壁1152与限位件13铆接固定。阀芯21的环形 部211的下端能够与密封部1211抵接或分离，当环形部211与密封部1211抵接时，限位件13位于环形部211的外侧。限位件13与阀座11铆接固定后将密封构件12相对于阀座11在轴向进行限位，进一步确保密封构件12在轴向不脱出阀座11。本实施例中，可以控制限位件13的下端的内径尺寸及衬套14的径向凸出部145的外径尺寸，二者之间的差值越小，防密封构件12向上反冲的效果越好。
本方案的电动阀应用于系统中，例如应用于制冷系统中后，橡胶材质的第二构件122被冷媒浸泡后溶胀，第二构件122与阀座11之间会积存有冷媒，冷媒积存于此，不利于第二构件122随阀芯21受力形变，影响电动阀的密封可靠性。为了对此进行改善，如图2和图4所示，第二构件122与阀座11的内壁之间包括第一排出通路X1，第一构件121的密封部1211与阀座11的内壁之间包括第二排出通路X2，限位件13包括第三排出通路X3，第一排出通路X1、第二排出通路X2、第三排出通路X3、第二流体端口40依次连通。
进一步地，如图3所示，第二台阶孔114与第三台阶孔115之间还包括过渡部160，过渡部160的内壁呈喇叭状，过渡部160的第一端与第三台阶孔151的第三底壁1151连接，过渡部160的第二端与第二台阶孔141的第二侧壁1412连接，过渡部160的第一端的孔径大于过渡部160的第二端的孔径。过渡部160与第一构件121的外壁之间形成过渡通路X 过，第一排出通路X1、第二排出通路X2、过渡通路X 过、第三排出通路X3依次连通。过渡通路X 过使流体从第二排出通路X2进入第三排出通路X3更加顺畅。
如图7所示，衬套14包括本体部140、径向凸出部145和下固定部146，径向凸出部145相对于本体部140径向凸出。如图所示，径向凸出部145的最大外缘直径大于本体部140的最大外径。径向凸出部145位于第一构件121的上侧，径向凸出部145限制密封构件在阀座11的轴向位移，即限制密封构件脱离阀座11(脱离是指密封构件的任何部件均不与阀座11接触)防止密封构件12受到流体压力向上反冲而导致密封构件失效。可以进行如下设计，本体部140的外壁与第一构件121的内壁过盈配合，相当于在第一构件121与衬套14之间又形成了一道面密封。径向凸出部145位于 第一构件121的上侧，径向凸出部145与密封部1211抵接将第一构件121的内缘压住，这样，衬套14与限位件13分别将第一构件121的内缘和外缘压住，使第一构件11的受力相对均匀，并且，防止密封构件12受到流体压力向上反冲而导致密封构件失效。下固定部146伸出阀座11的下端后，下固定部146与阀座11铆接固定将密封构件12限位在阀座11上，即下固定部与径向凸出部的配合将密封构件限位于阀座。此处之所以采取铆接固定，而不采用焊接固定，有益处在于，相比于焊接，铆接固定更加方便易行，并且，在铆接过程中，能够通过控制铆接压力以及压入深度而很好地保证固定可靠性。衬套14固定可靠，则提高了密封构件与阀座之间的连接可靠性，相比于背景技术，能够改善电动阀的关阀可靠性。
进一步地，径向凸出部145的外壁包括直面段1451和斜面段1452，斜面段1452的横截面呈圆形，斜面段1452的外径自与直面段1451相连接的一端向远离直面段1451的一端渐缩，阀芯21的环形部211的内壁能够与斜面段配合调整电动阀的流量。
如图3和图4所示，第一构件121的环形的套接部1212包括位于第一台阶孔113的第一侧壁1132与衬套14的外壁之间的伸入部1220，伸入部1220的外壁与第一台阶孔113的第一侧壁1132之间包括第四排出通路X4，伸入部1220的下端与第一台阶孔的第一底壁1131之外包括第五排出通路X5，衬套14的壁部包括径向通孔X6，第四排出通路X4、第五排出通路X5、径向通孔X6、第一流体端口30依次连通，使第二构件122的内侧一旦有冷媒积存能够及时得到释放。
如图4、图5所示，第二构件122的内壁与环形的套接部1212的外壁过盈配合，这样，在第二构件122与第一构件121之间又形成一道面密封，利于电动阀的关阀可靠性。第一构件121的密封部1211还包括向下伸出的环形凸缘部1210，第二构件122至少部分位于环形凸缘部1210与套接部1212之间，则第二构件122将第一构件121罩设住，第二构件122卡接在第一构件121上，第一构件121对第二构件122的径向位移和轴向位移均有限位作用。环形凸缘部1210与阀座11的内壁之间的间隙作为第二排出通路X2，限位件13包括轴向贯通孔，轴向贯通孔作为第三排出通路X3，各排出通路的结构设计简单。
本方案的电动阀，还可以作出变更设计，图8所示为使用另一结构的衬套14A时I处的局部放大图；图9所示为图8中I 1处的局部放大图。如图所示，与前述实施例不同的是，衬套14包括导向段1401，导向段1401呈锥台状，位于密封构件12的下侧，导向段1401的更靠近下固定部146的一端的外径小于更靠近径向凸出部145的一端的外径，导向段1401在密封构件12套设至衬套14时起到导向作用，并且，在密封构件12套设至衬套14后，能够改善或防止密封构件12相对于衬套14产生轴向的窜动。
以上对本申请所提供的电动阀及电动阀的装配方法进行了举例介绍。本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以对本申请进行若干改进和修饰，这些改进和修饰也落入本申请权利要求的保护范围内。

Claims (13)

  1. 一种电动阀，包括阀座部件和阀芯部件，其特征在于，所述阀座部件包括阀座、密封构件，所述密封构件包括第一构件和第二构件，所述第一构件包括密封部，所述密封部由塑料制成，所述第二构件由弹性材料制成，所述第二构件设置于所述第一构件与所述阀座之间，所述第二构件与所述第一构件、所述阀座弹性抵接，所述阀芯部件包括阀芯，所述阀芯能够相对于所述阀座轴向移动，所述阀芯包括环形部，所述环形部的下端能够与所述密封部抵接或分离。
  2. 根据权利要求1所述的电动阀，其特征在于，所述阀座部件还包括衬套，所述衬套与所述阀座固定连接，所述衬套呈环状，所述密封构件外套于所述衬套，所述衬套包括阀口，所述电动阀包括第一流体端口和第二流体端口，所述第一流体端口与所述阀口连通，所述阀芯的所述环形部的下端与所述密封部分离时，所述第二流体端口与所述阀口连通。
  3. 根据权利要求2所述的电动阀，其特征在于，所述阀座部件还包括限位件，所述限位件与所述阀座固定连接；所述第一构件还包括环形的套接部，所述第二构件呈环状，所述第二构件套设于所述套接部，当所述环形部与所述密封部抵接时，所述限位件位于所述环形部的外侧。
  4. 根据权利要求3所述的电动阀，其特征在于，所述第二构件与所述阀座的内壁之间包括第一排出通路，所述密封部与所述阀座的内壁之间包括第二排出通路，所述限位件包括第三排出通路，所述第一排出通路、所述第二排出通路、所述第三排出通路、所述第二流体端口依次连通。
  5. 根据权利要求4所述的电动阀，其特征在于，所述阀座包括第一台阶孔和第二台阶孔、第三台阶孔，所述第一台阶孔的孔径小于所述第二台阶孔的孔径，所述第二台阶孔包括第二底壁和第二侧壁，所述第三台阶孔包括第三底壁，所述第二构件位于所述第二底壁，所述第二构件与所述第二侧壁之间包括所述第一排出通路，所述密封部与所述第二侧壁之间包括所述第二排出通路，所述第二台阶孔与所述第三台阶孔之间还包括过渡部，所述过渡部的内壁呈喇叭状，所述过渡部的第一端与所述第三底壁连接，所述过渡部的第二端与所述第二侧壁连接，所述过渡部的所述第一端的孔 径大于所述过渡部的所述第二端的孔径，所述过渡部与所述第一构件的外壁之间形成过渡通路，所述第一排出通路、所述第二排出通路、所述过渡通路、所述第三排出通路依次连通。
  6. 根据权利要求3所述的电动阀，其特征在于，所述阀座包括第一台阶孔，所述套接部包括位于所述第一台阶孔的第一侧壁与所述衬套的外壁之间的伸入部，所述伸入部的外壁与所述第一侧壁之间包括第四排出通路，所述伸入部的下端与所述第一台阶孔的第一底壁之间包括第五排出通路，所述衬套的壁部包括径向通孔，所述第四排出通路、所述第五排出通路、所述径向通孔、所述第一流体端口依次连通。
  7. 根据权利要求4所述的电动阀，其特征在于，所述第二构件的内壁与所述套接部的外壁过盈配合，所述第一构件的所述密封部包括向下伸出的环形凸缘部，所述第二构件至少部分位于所述环形凸缘部与所述套接部之间，所述环形凸缘部与所述阀座的内壁之间的间隙作为所述第二排出通路，所述限位件呈圆环状，所述限位件包括轴向贯通孔，所述轴向贯通孔作为所述第三排出通路。
  8. 根据权利要求1-7任一项所述的电动阀，其特征在于，所述第一构件由PTFE材料制成，所述第二构件由橡胶制成。
  9. 根据权利要求1-7任一项所述的电动阀，其特征在于，所述密封部的与所述阀芯直接接触的部位的厚度大于等于0.1mm且小于等于0.5mm。
  10. 根据权利要求2-7任一项所述的电动阀，其特征在于，所述衬套包括本体部、下固定部和相对于所述本体部径向凸出的径向凸出部，所述本体部的外壁与所述第一构件的内壁过盈配合，所述径向凸出部与所述密封部抵接，所述下固定部与所述阀座铆接固定。
  11. 根据权利要求10所述的电动阀，其特征在于，所述径向凸出部的外壁包括直面段和斜面段，所述斜面段的横截面呈圆形，所述斜面段的外径自与所述直面段相连的一端向远离所述直面段的一端渐缩，所述衬套的外壁具有导向段，所述导向段位于所述密封构件的下侧，所述导向段的更靠近所述密封构件的一端的外径大于更远离所述密封构件的一端的外径。
  12. 一种电动阀的装配方法，所述电动阀包括阀座部件和阀芯部件，所述阀座部件包括阀座、密封构件、衬套，所述阀座包括密封构件安装部， 所述衬套包括径向凸出部，所述密封构件包括第一构件和第二构件，所述第一构件呈环状，所述第一构件包括密封部，所述密封部由塑料制成，所述第二构件由弹性材料制成，所述衬套呈环状，所述阀芯部件包括阀芯，所述阀芯包括环形部，所述装配方法包括：将所述第一构件与所述第二构件组装形成所述密封构件；将组装后的所述密封构件套设于所述衬套的外部，使所述径向凸出部位于所述密封构件上侧，形成第一预装部件；将所述第一预装部件的所述密封构件置于所述密封构件安装部，之后，将所述衬套与所述阀座固定连接。
  13. 根据权利要求12所述的电动阀的装配方法，其特征在于，所述衬套还包括下固定部，将所述衬套的所述下固定部伸出所述阀座的下端并与所述阀座铆接固定。
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