JP2013539850A - Motorized valve - Google Patents

Abstract

A motor-operated valve for adjusting the flow rate of fluid, which has a valve seat (12) provided with a valve chamber (121) and a valve disc seat (11) with a valve port (113) fixed to the valve seat And the valve stem lead screw unit includes a lead screw (23) and a valve stem (21) driven by the lead screw (23), and the nut unit includes a nut (32) and a connection sheet (31). The connection seat is fixedly connected to the valve seat, the nut is screwed with the lead screw, the nut has a nut lower guide step (321) and the valve stem has a lower guide step (211) The valve seat has a first guiding step (111) to be mated with the lower guiding step of the nut and a second guiding step (112) to be mated with the lower guiding step of the valve stem. The concentricity between the nut and the valve stem lead screw and the valve seat can be easily secured, and the problem of the valve port not being sealed or the valve port being eccentrically worn can be avoided, and the operation of the motorized valve Reliability has also been improved.
[Selected figure] Figure 1

Description

  The present invention relates to a control valve, and more particularly to a motorized valve for adjusting the flow rate of fluid.

  In air conditioners, refrigerators, heat pump water heaters and various cooling and heating devices, motor-operated valves are usually used to adjust the flow rate of fluid.

  Generally, a motorized valve consists of a valve seat unit, a nut unit, a valve rod lead screw unit, and a rotor unit. The seat, the valve seat and the pipe are usually welded together to form a valve seat unit, and the valve stem of the valve stem lead screw unit is mounted in the nut of the nut unit.

  Patent Document 1 discloses a motor-operated valve, and it is necessary to fix the nut of the nut unit in the guide sleeve, fix the guide sleeve to the valve seat, and fix the valve stem in the valve port of the valve seat. , The requirement of the coaxiality for the valve seat and the nut is relatively high.

Unexamined-Japanese-Patent No. 2010-25932

  The motor-operated valve can not ensure coaxiality between the valve seat and the nut unless it is indirectly controlled over a plurality of assembling steps, and the processing accuracy of a plurality of parts such as a nut, a guide sleeve, a valve seat, and a valve rod Affects the coaxiality between the valve seat and the nut, so it is difficult to secure the coaxiality, and if the valve seat and the nut are not coaxial, the noncoaxial disadvantage between the valve rod and the valve port tends to occur. This leads to the problem that the valve port is not sealed or the valve port is eccentrically worn, which not only makes the operation of the motorized valve less reliable but also shortens the service life of the motorized valve.

  Therefore, researching and developing a motorized valve that meets the requirement of increasing the coaxiality between the valve seat unit, the nut unit and the valve stem lead screw unit is a technical challenge to be solved by those skilled in the art.

  An object of the present invention is to provide a motor-operated valve comprising a valve seat unit, a nut unit, and a valve rod lead screw unit, and the valve seat unit comprises a valve seat provided with a valve chamber and the valve seat. Including a fixed valve stem seat, the valve stem lead screw unit including a lead screw and a valve stem driven by the lead screw, the nut unit including a nut and a connection seat, The connection seat is fixedly connected to the valve seat, the nut is screwed into the lead screw, the nut has a lower guide step, the valve stem has a lower guide step, and the valve The seat has a first guiding step associated with the lower guiding step of the nut and a second guiding step associated with the lower guiding step of the valve stem.

  In the motor-operated valve configured as described above, the first guide step of the valve seat is provided at the outer edge or the inner edge of the valve seat opposite to the valve port side. The lower guide step of the nut being provided at the inner or outer edge of the nut so as to mate with the first guide step of the valve seat so that the valve seat fits the nut It is preferred that it be positioned.

  The motor-operated valve configured as described above has a stepped portion at an outer edge or an inner edge opposite to the valve port side of the valve body seat, and the first guide step is an outer edge or an outer edge It is preferable that it is a relatively cylindrical outer wall portion or an inner wall portion of a round hole in the upper portion among the step portions in the inner edge portion.

  The motor-operated valve configured as described above has the step portion at an inner edge portion on the opposite side to the valve port side of the valve body seat, and the second guide step is the step at the inner edge portion. It is preferable that it is an inner wall part of the inner hole of the side relatively near the said valve port among parts.

  In the motor-operated valve configured as described above, the valve body seat is provided with a valve body storage chamber, and the second guide step of the valve body seat is provided at the inner edge portion of the storage chamber, Preferably, the lower guide step of the valve stem is provided at the outer edge of the valve stem.

  In the motor-operated valve configured as described above, the valve stem includes a valve stem stage in which the valve stem aligns with the lower guide stage and the valve port, and the second guide stage of the valve disc seat guides the lower guide of the valve stem It is preferable that the valve stem be provided in the receiving chamber of the valve seat so as to be slidable along the axial direction.

  In the motor-operated valve configured as described above, preferably, the valve body seat is provided with an opening for connecting the storage chamber and the valve chamber.

  In the motor-operated valve configured as described above, the nut has a screw step to be combined with the lead screw on the side opposite to the lower guide step side, and the lead screw is mounted to the upper end or the lower end of the screw step. It is preferred to have a lead screw guide step to mate with.

  Preferably, in the motor-operated valve configured as described above, a spring elastically connects between the lead screw and the valve rod.

  In the motor-operated valve configured as described above, a valve rod cover is provided between the lead screw and the valve rod, and the valve rod cover is fixedly connected to the valve rod, and the parent Preferably, a screw passes through the valve stem cover and into the bore of the valve stem and is in direct or indirect contact with the spring.

  In the motor-operated valve provided by the present invention, both the valve stem lead screw unit and the nut unit are provided with guide stages to be combined with the valve seat, and are aligned with the valve seat by the guide stages. In order to ensure the relative position tolerance and accuracy requirements, either the first guide and the second guide of the valve seat and the valve port at the valve seat may both be molded simultaneously by primary processing or It can be molded by a mold, and it is possible to ensure the concentricity between the valve port of the nut unit, the valve stem screw unit and the valve seat, and avoid the problem that the valve port is not sealed or the valve port is eccentrically worn. Since the degree of coaxiality between the valve rod and the valve port is improved, the frictional force when the rotor of the rotor unit rotates is obviously reduced, and the reliability of the operation of the motor-operated valve is also improved.

It is a structural schematic diagram which shows the specific Example of the motor operated valve provided by this invention. They are an external view which shows the nut unit in FIG. 1, and axial sectional drawing. It is an external view and axial sectional drawing which show the valve body seat in FIG. It is a structural schematic diagram which shows the specific Example of the other motor-operated valve provided by this invention. They are an external view which shows the nut unit in FIG. 4, and axial sectional drawing. It is an external view and axial sectional drawing which show the valve body seat in FIG.

  This application was submitted to the Chinese Patent Office on October 15, 2010, and has an application number of 20101051523.4.1 and an invention title of "Motorized valve", and a Chinese Patent Office on October 15, 2010. And the application number is 201010515238. China patent application with the invention title "Motorized valve and its stop device" and filed with China Patent Office on July 1, 2011, application number 201110184918.2, invention title "Motorized valve equipment Claiming priority over Chinese patent applications, which are incorporated herein by reference in their entirety.

  Hereinafter, the present invention will be described in more detail based on the drawings and specific embodiments so that those skilled in the art can better understand the technical solution of the present invention.

  FIG. 1 is a structural schematic view showing a specific embodiment of the motor-operated valve provided by the present invention, FIG. 2 is an external view showing a nut unit and an axial sectional view, and FIG. It is an outline drawing and an axial side sectional view. Please refer to Figure 1, Figure 2 and Figure 3.

  The motor operated valve provided by the present invention comprises a valve seat unit, a nut unit, a valve rod lead screw unit and a rotor unit.

  The valve seat unit comprises a valve seat 11 and a valve seat 12. A valve port 113 is machined in the valve body seat 11, and the valve seat 12 has a substantially cylindrical configuration with a hole at the bottom portion for aligning the valve body seat, and a valve chamber 121 is formed therein. In the present embodiment, the valve seat unit further includes a first pipe 13 and a second pipe 14. The valve body seat 11, the valve seat 12, the first pipe 13 and the second pipe 14 form a valve seat unit so as to be integrally connected. Naturally, the valve body seat 11, the valve seat 12, the first pipe 13 and the second pipe 14 may be integrally connected by welding or may be integrally molded.

  The nut unit comprises a nut 32 and a connection sheet 31. The connection sheet 31 is integrally provided with the nut 32 as a fitting member, the connection sheet 31 and the valve seat 12 are fixedly bonded by welding, and the nut 32 is at the upper end It is screwed with the lead screw 23 through the provided screw. At the inner edge of the lower part of the nut 32, a guide step 321 is provided. The bore in the upper part of the nut 32 is provided with a lead screw guide step 322 which mates with the lead screw 23 and the lead screw guide step 322 is at the nut 32 so as to contribute to the guidance when the lead screw is turned. It may be provided on the upper side or the lower side of the screw step to be combined with the lead screw 23. A spring guide rail 33 and a locking slide ring 34 are mounted on the outer circumference of the upper portion of the nut 32 so as to cover it.

  The valve stem lead screw unit comprises a lead screw 23 and a valve stem 21 driven by the lead screw 23. In the present embodiment, the valve stem lead screw unit further includes a valve stem cover 22, a retaining ring 24, and a spring 25. The valve rod 21 and the valve rod cover 22 may be integrally connected, and specifically, the valve rod 21 and the valve rod cover 22 may be integrally connected by a method such as welding or interference fitting. A locking ring 24 is mounted on the leading end of the lead screw 23 so as to cover, and the locking ring 24 is mounted so as to cover the lead screw 23 by a method such as welding or interference fitting. The spring 25 is further provided in the inner hole of the valve rod 21 so that the end of the lead screw 23 can abut on the spring 25. The lead screw 23 and the valve rod 21 are elastically connected. A guide step 211 is provided at the outer edge of the valve rod 21.

  The rotor unit is composed of a rotor 41, a rotor stopper 42 and a connecting body connecting the two, and the rotor unit is fixed to the upper end of the lead screw 23.

  In a specific proposal, the motor-operated valve further includes a case 5, which is mounted so as to cover the valve seat 12 so as to seal the valve body.

  A stepped portion is provided on the outer edge of the valve seat 11, and a relatively upper portion of the stepped portions provided on the outer edge of the valve seat 11, that is, the opposite side to the valve opening (from the valve opening The cylindrical outer wall in the far direction) is the first guide step 111 of the present invention, and the first guide step 111 of the valve seat 11 is aligned with the lower guide step 321 of the nut 32, specifically In other words, the two may be assembled by an intermediate fit, an interference fit or a small clearance fit, thereby positioning the valve seat 11 and the nut 32. Thus, the coaxiality between the valve seat 11 and the nut 32 can be secured, and further, the coaxiality between the valve stem and the nut is secured through the arrangement of the guide stages provided between the valve seat 11 and the valve stem Be done. The valve stem lead screw unit is then functioned to be guided upwardly and downwardly via a lead screw guide step 322 provided on the nut and guiding with the lead screw in the valve stem lead screw unit. As a result, the degree of coaxiality between the valve port and the valve stem of the valve disc seat can be easily ensured, and the problem that the valve port is not sealed or the valve port is eccentrically worn can be avoided.

  The valve body seat 11 is further provided with a valve body accommodating chamber 114, and a second guide step 112 is provided at the inner edge portion of the accommodating chamber 114. The valve body seat 11 is further provided with an opening 115 for connecting the accommodation chamber 114 and the valve chamber 121. The second guide stage 112 of the valve seat 11 is aligned with the guide stage 211 of the valve stem. A valve rod 21 is provided in the accommodation chamber 114 of the valve seat 11 slidably in the axial direction.

  In the motor-operated valve provided by the present invention, the valve rod is first screwed with the nut of the lead screw unit, and the valve disc slides in the axial direction between the guide step provided at the lower end of the nut and the guide step of the valve rod. The nut unit is fixed to the valve seat in such a manner that the connecting sheet and the valve seat are welded after mounting at a predetermined position by combining with the first guide stage and the second guide stage in the seat. The first guide step and the second guide step in the valve seat and the valve port in the valve seat are both simultaneously formed by primary processing or molded by a mold, so that relative position tolerance and accuracy Requirements, and it is very easy to ensure the concentricity between the valve port of the nut, the valve stem lead screw unit and the valve body seat, and the problem that the valve port is not sealed or the valve port is eccentrically worn is avoided. be able to. And since the coaxiality of a valve stem and a valve port improves, the frictional force at the time of the rotor in a rotor unit rotating is also reduced significantly, and the reliability of operation of an electrically operated valve also improves.

  The "inner edge" or "outer edge" referred to in the present invention by the person skilled in the art refers to the axially inner edge of the bore or the axially outer edge of the shaft, for example in the present embodiment the axial inner bore of the nut It should be understood to refer to a circular surface or an axially outer circular surface.

  FIG. 4 is a structural schematic view showing another specific embodiment of the motor-operated valve provided by the present invention, FIG. 5 is an outline view and a shaft side sectional view showing a nut unit, and FIG. They are an external view which shows these, and axial side sectional drawing. Please refer to Figure 4, Figure 5 and Figure 6.

  The difference between this embodiment and the previous embodiment is that a guide step 321 is provided at the outer edge of the lower part of the nut 32, and that a guide step 211 is provided at the outer edge of the valve rod 21.

  A circular step is provided at the inner edge of the valve seat 11, and a first guide is provided to a step surface having a larger diameter, that is, to the inner wall of a relatively upper round hole at the inner edge of the valve seat 11. A step 111 is provided, which positions the valve seat 11 and the nut 32 by aligning the first guide step 111 of the valve seat 11 and the guide step 321 of the nut 32, while having a smaller diameter. A second guiding step 112 is provided on the step surface, the inner hole of which forms the valve body accommodating chamber 114, and the second guiding step 112 of the valve seat 11 is aligned with the guiding step 211 of the valve rod Thus, the valve rod 21 is provided in the accommodation chamber 114 of the valve seat 11 slidably in the axial direction.

  The content described above is only a description of a preferred embodiment of the invention, and the terms top, bottom, inside, outside, etc. in the specification of the present invention are used to further clarify the description, and Please note that the invention should not be considered limiting. Given that there are specific configurations in which there is a limit in expression by letters and no limit in an objective limit, those skilled in the art may make some improvements and modifications on the premise that they do not deviate from the principle of the present invention. It should be understood that the improvements and modifications of are within the protection scope of the present invention.

  11-valve body seat, 111-first guide stage, 112-second guide stage, 113-valve port, 114-valve body storage chamber, 115-opening, 12-valve seat, 121-valve chamber, 13- First piping, 14-second piping, 21-valve stem, 211-guide step, 22-valve stem cover, 23-lead screw, 24-stop ring, 25-spring, 31-connecting sheet, 32-nut 321-guide step, 322-lead screw guide step, 33-spring guide rail, 34-slide ring, 41-rotor, 42-rotor stop, 5-case.

Claims (10)

A valve seat unit, a nut unit, and a valve stem lead screw unit, wherein the valve seat unit is fixed to a valve seat (12) provided with a valve chamber (121) and the valve seat (12) A valve disc seat (11) having a valve port (113), the valve stem lead screw unit including a lead screw (23) and a valve stem (21) driven by the lead screw (23) The nut unit includes a nut (32) and a connecting sheet (31);
The connection sheet (31) is fixedly connected to the valve seat (12), and the nut (32) is screwed with the lead screw (23).
The nut (32) has a lower guide step (321), the valve rod (21) has a lower guide step (211), and the valve seat (11) is a lower guide step (321) of the nut A motor-operated valve characterized in that it has a first guiding step (111) to be aligned with the second guiding step (112) to be aligned with the lower guiding step (211) of the valve stem.   The nut according to the fact that the first guide step (111) of the valve body seat (11) is provided at the outer edge or the inner edge of the valve body seat (11) opposite to the valve opening side By the lower guide step (321) of (32) being provided at the inner or outer edge of said nut (32) to mate with the first guide step (111) of said valve seat (11) The motor operated valve according to claim 1, characterized in that the valve body seat (11) is positioned to fit the nut (32).   The valve seat (11) has a stepped portion at the outer edge or inner edge opposite to the valve opening side, and the first guide step (111) is the stepped portion at the outer edge or inner edge The motor-operated valve according to claim 2, which is a relatively cylindrical outer wall portion or an inner wall portion of a round hole in the upper part thereof.   The step portion is provided at the inner edge portion of the valve body seat (11) opposite to the valve opening side, and the second guide step (112) is relatively included in the step portions at the inner edge portion. The motor-operated valve according to claim 3, wherein the motor-operated valve is an inner wall portion of an inner hole closer to the valve port (113).   A valve body chamber (114) is provided in the valve body seat (11), and a second guiding step (112) of the valve body seat (11) is provided at an inner edge portion of the chamber (114) The motor-operated valve according to claim 1, wherein the lower guide step (211) of the valve rod (21) is provided at the outer edge of the valve rod (21).   The valve stem (21) includes a valve stem stage to be associated with the lower guide stage (211) and the valve port, and a second guide stage (112) of the valve seat (11) is the valve stem (21) And the valve rod (21) is provided in the storage chamber (114) of the valve seat (11) so as to be slidable along the axial direction. The motor operated valve according to claim 5.   The valve seat (11) is provided with an opening (115) for connecting the storage chamber (114) and the valve chamber (121). The motorized valve described in.   The nut (32) has a screw step to be combined with the lead screw (23) on the side opposite to the lower guide step side, and is fitted to the lead screw (23) at the upper end or the lower end of the screw step. The motor-operated valve according to any one of claims 1 to 6, characterized in that it has a lead screw guide step (322).   The motor-operated valve according to any one of claims 1 to 6, wherein the lead screw (23) and the valve rod (21) are elastically connected by a spring (25).   A valve stem cover (22) is provided between the lead screw (23) and the valve stem (21), and the valve stem cover (22) is fixedly connected to the valve stem, and the master A screw according to claim 9, characterized in that a screw passes through the valve stem cover (22) to the inner bore of the valve stem (21) and is in direct or indirect contact with the spring (25). Motorized valve.

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