JP5716980B2 - Motorized valve - Google Patents

Description

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

  In air conditioners, refrigerators, heat pump water heaters, and various cooling / heating devices, the flow rate of fluid is usually adjusted using an electric valve.

  Generally, a motorized valve consists of a valve seat unit, a nut unit, a valve stem lead screw unit, and a rotor unit. The valve seat unit consists of a valve body seat, a valve seat, and piping. The body seat, the valve seat, and the pipe are usually welded together to constitute 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 an electric valve, and the nut of the nut unit is fixed in the guide sleeve, the guide sleeve is fixed to the valve seat, and the valve stem needs to be fixed in the valve opening of the valve seat. The requirements for the coaxiality of the valve seat and the nut are relatively high.

JP 2010-25932 A

  The motor-operated valve cannot secure the coaxiality between the valve seat and the nut unless it is indirectly controlled over a plurality of assembly processes, and the processing accuracy of a plurality of parts such as a nut, a guide sleeve, a valve seat, and a valve stem Affects the coaxiality between the valve seat and the nut, so it is difficult to ensure the coaxiality. This leads to a problem that the valve opening is not sealed or the valve opening is eccentrically worn, which not only lowers the reliability of the operation of the motor-operated valve but also shortens the service life of the motor-operated valve.

  Therefore, researching and developing a motor-operated valve that satisfies the requirement of increasing the degree of 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 an electric valve comprising a valve seat unit, a nut unit, and a valve stem lead screw unit. The valve seat unit includes a valve seat provided with a valve chamber, and the valve seat. and a fixed have that valve body seat, the valve Booya screw unit includes a valve stem which is driven by a lead screw and said lead screw, said nut unit includes a nut and connecting sheet, said connection The seat is fixedly connected to the valve seat, the nut is screwed with the lead screw, the nut has a lower guide step, the valve stem has a guide step at an outer edge , and the valve The body seat includes a hole into which the valve rod is inserted, a valve body storage chamber in which the valve rod inserted through the hole is slidably disposed along the axial direction, and the valve rod in the valve body storage chamber. A valve port that is sealed by hitting, and a position between the hole and the valve port. And an opening for communicating with said valve chamber and the valve body accommodating chamber, provided in the outer edge or the inner edge of the valve body seat, a first guide step used against the lower guide step of the nut, the It provided the inner edge portion of the valve body seat, and a second guide step used against the guide step of the valve stem.

  According to the motor-operated valve configured as described above, the first guide stage of the valve body seat is provided on the outer edge or the inner edge of the valve body seat opposite to the valve port side. The lower body guide stage of the nut is provided at the inner edge or the outer edge of the nut so as to be combined with the first guide stage of the valve body seat so that the valve body seat fits the nut. It is preferable that it is positioned.

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

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

  The motor-operated valve configured as described above has a screw stage with which the nut engages with the lead screw on the side opposite to the lower guide step side, and the lead screw at the upper end or the lower end of the screw step. It is preferable to have a lead screw guide step to mate with.

  In the motor-operated valve configured as described above, it is preferable that the lead screw and the valve stem are elastically connected by a spring.

  In the motor-operated valve configured as described above, a valve stem cover is provided between the lead screw and the valve stem, and the valve stem cover is fixedly connected to the valve stem. It is preferable that the screw passes through the valve stem cover and enters the inner hole 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 a guide stage for mating with the valve body seat, and the guide stage is mated with the valve body seat. The first guide part and the second guide part of the valve body seat and the valve port in the valve body seat are all molded by primary processing at the same time so as to ensure the tolerance and accuracy requirements of the relative position Can be molded by the mold, can ensure the coaxiality between the nut unit, valve stem lead screw unit and valve body seat valve opening, avoiding the problem that the valve opening is not sealed or the valve opening is eccentrically worn In addition, since the coaxiality between the valve stem and the valve port is improved, the frictional force when the rotor of the rotor unit is rotated is obviously reduced, and the reliability of the operation of the motor-operated valve is also improved.

It is a structure schematic diagram which shows the specific Example of the motor operated valve provided by this invention. It is the external view and shaft side sectional drawing which show the nut unit in FIG. It is the external view and shaft side sectional drawing which show the valve body seat in FIG. It is a structure schematic diagram which shows the specific Example of the other motor operated valve provided by this invention. It is the external view and shaft side sectional drawing which show the nut unit in FIG. It is the external view and shaft side sectional drawing which show the valve body seat in FIG.

  This application was filed with the Chinese Patent Office on October 15, 2010, the application number was 20101051534.3, and the title of the invention was “motorized valve”. Submit the application number 20101015238. X, the Chinese patent application whose invention name is “motorized valve and its stop device”, and filed with the Chinese Patent Office on July 1, 2011, the application number is 2011110184918.2, the invention name is “motorized valve device” Claiming priority with the Chinese patent applications that are incorporated herein by reference in their entirety.

  In order that those skilled in the art can better understand the technical solution of the present invention, the present invention will be described in more detail with reference to the drawings and specific embodiments.

  FIG. 1 is a schematic configuration diagram showing a specific embodiment of a motor-operated valve provided by the present invention, FIG. 2 is an outline view showing a nut unit and a shaft side sectional view, and FIG. 3 shows a valve body seat. It is an outline drawing and a shaft side sectional view. Please refer to Fig.1, Fig.2 and Fig.3.

  The motor-operated valve provided by the present invention includes a valve seat unit, a nut unit, a valve stem lead screw unit, and a rotor unit.

The valve seat unit includes a valve body seat 11 and a valve seat 12. A valve port 113 is processed and formed in the valve body seat 11, and the valve seat 12 has a substantially cylindrical configuration with a hole for fitting the valve body seat 11 in the bottom, and a valve chamber 121 is formed therein. In this 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. Of course, 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 formed.

The nut unit includes a nut 32 and a connection sheet 31. The connection sheet 31 is provided integrally with the nut 32 as a fitting member, and the connection sheet 31 and the valve seat 12 are fixedly bonded by welding. The lead screw 23 is screwed through a provided screw. A guide step 321 is provided at the inner edge of the lower portion of the nut 32. The inner hole in the upper part of the nut 32 is provided with a lead screw guide step 322 to be mated with the lead screw 23. The lead screw guide step 322 is provided with a nut 32 so as to contribute to the guide when the lead screw 23 rotates. 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 retaining 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 includes a lead screw 23 and a valve stem 21 driven by the lead screw 23. In this embodiment, the valve stem lead screw unit further includes a valve stem cover 22, a retaining ring 24, and a spring 25. The valve stem 21 and the valve stem cover 22 are integrally connected. Specifically, the valve stem 21 and the valve stem cover 22 may be integrally connected by a method such as welding or interference fitting. A stopper ring 24 is attached to the tip of the lead screw 23 so as to cover it, and the stop ring 24 is attached so as to cover the lead screw 23 by welding, interference fitting, or the like. A spring 25 is further provided in the inner hole of the valve stem 21 so that the end of the lead screw 23 can abut against the spring 25. The lead screw 23 and the valve stem 21 are elastically connected. A guide stage 211 is provided on the outer edge of the valve stem 21.

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

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

A step portion is provided at the outer edge portion of the valve body seat 11, and the upper portion of the step portion provided at the outer edge portion of the valve body seat 11, that is, the side opposite to the valve port side (from the valve port) The columnar outer wall portion on the far side) is the first guide stage 111 of the present invention, and the first guide stage 111 of the valve seat 11 is combined with the lower guide stage 321 of the nut 32, specifically In other words, both may be assembled by intermediate fitting, interference fitting or small gap fitting, thereby positioning the valve seat 11 and the nut 32. In this way, the coaxiality between the valve seat 11 and the nut 32 can be ensured, and the valve stem 21 and the nut 32 are further connected through the guide stages 111 and 211 provided between the valve seat 11 and the valve stem 21. And coaxiality is secured. Thereafter, the valve stem lead screw unit is caused to function to be guided upward and downward through a lead screw guide step 322 provided on the nut 32 and guided in combination with the lead screw 23 in the valve stem lead screw unit. This makes it easy to ensure the coaxiality of the valve port 113 and the valve stem 21 with the valve body seat 11, or valve port 113 valve port 113 is not closed can be avoided the problem that is eccentric wear.

The valve body seat 11 is further provided with a valve body storage chamber 114, and a second guide stage 112 is provided at the inner edge of the valve body storage chamber 114. The valve body seat 11 is further provided with an opening 115 for connecting the valve body accommodation chamber 114 and the valve chamber 121. The second guide stage 112 of the valve body seat 11 is combined with the guide stage 211 of the valve stem 21 . The valve stem 21 is provided in the valve body accommodating chamber 114 of the valve body seat 11 so as to be slidable along the axial direction.

In the motor-operated valve provided by the present invention, first, the valve stem lead screw unit is screwed with the nut 32, and the guide stage 321 provided at the lower end of the nut and the guide stage 211 of the valve stem 21 are respectively slid in the axial direction. In this manner, the nut unit is a method in which the connection sheet 31 and the valve seat 12 are welded after being mounted at a predetermined position by combining with the first guide stage 111 and the second guide stage 112 in the valve body seat 11 . Is fixed to the valve seat 12 . A first guide step 111 in the valve body seat 11 valve ports 113 in the second guide step 112 and the valve body seat 11, since both are molded by either or die is molded by the primary process at the same time, the relative position Tolerance and accuracy requirements can be satisfied, and the coaxiality between the nut 32 , the valve stem lead screw unit and the valve port 113 of the valve body seat 11 can be extremely easily secured, and the valve port 113 is not sealed or the valve port The problem that 113 is worn eccentrically can be avoided. And since the coaxiality of the valve stem 21 and the valve port 113 is improved, the frictional force when the rotor in the rotor unit is rotated is remarkably reduced, and the reliability of the operation of the motor-operated valve is also improved.

Those skilled in the art refer to the “inner edge” or “outer edge” in the present invention as the axial inner edge of the hole or the axial outer edge of the shaft. For example, in this embodiment, the axial direction of the inner hole of the nut 32 It should be understood that it refers to the inner circle surface or the axial outer circle surface.

FIG. 4 is a structural schematic diagram showing another specific example 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. 6 is a valve seat. FIG. 11 is an external view and FIG. Please refer to FIG. 4, FIG. 5 and FIG.

  The difference between this embodiment and the above embodiment is that a guide step 321 is provided at the outer edge of the lower portion of the nut 32 and a guide step 211 is provided at the outer edge of the valve stem 21.

A circular stepped portion is provided at the inner edge of the valve body seat 11, and the first guide is provided on a stepped surface having a larger hole diameter, that is, an inner wall portion of a relatively upper round hole at the inner edge of the valve body seat 11. A stage 111 is provided, and the valve body seat 11 and the nut 32 are positioned by combining the first guide stage 111 of the valve body seat 11 and the guide stage 321 of the nut 32, while the hole diameter thereof is smaller. A second guide step 112 is provided on the step surface, and its inner hole forms a valve body accommodating chamber 114, and the second guide step 112 of the valve body seat 11 is combined with the guide step 211 of the valve stem. Thus, the valve stem 21 is provided in the valve body accommodating chamber 114 of the valve body seat 11 so as to be slidable along the axial direction.

  The above description is only a description of a preferred embodiment of the present invention, and the terms of directional position in the specification of the present invention, such as “up”, “down”, “in” and “outside”, are used for further clarifying the explanation. Please note that the invention should not be regarded as limiting. Since there is a specific configuration in which there is a limit to the expression by letters and there is no limit to the objective, those skilled in the art may make some improvements and modifications without departing from the principles of the present invention. It should be understood that improvements and modifications fall within the protection scope of the present invention.

  11-Valve seat, 111-First guide stage, 112-Second guide stage, 113-Valve, 114-Valve housing chamber, 115-Open, 12-Valve seat, 121-Valve chamber, 13- 1st piping, 14-second piping, 21-valve rod, 211-guide stage, 22-valve rod cover, 23-lead screw, 24-lock ring, 25-spring, 31-connection sheet, 32-nut 321-guide stage, 322 lead screw guide stage, 33-spring guide rail, 34-slide ring, 41-rotor, 42-rotor stopper, 5-case.

Claims (7)

Including a valve seat unit, a nut unit, and a valve stem lead screw unit;
The valve seat unit includes a valve seat which the valve chamber (121) is provided with (12), the valve seat (12) valve body seat that is fixed to a (11),
The valve stem lead screw unit includes a lead screw (23) and a valve stem (21) driven by the lead screw (23),
The nut unit includes a nut (32) and a connection sheet (31),
The connection sheet (31) is fixedly connected to the valve seat (12),
The nut (32) is screwed with the lead screw (23),
The nut (32) has a lower guide stage (321),
The valve stem (21) has a plan in the step at the outer edge (211),
Said valve body seat (11),
A hole into which the valve stem (21) is inserted;
A valve body accommodating chamber (114) in which the valve rod (21) inserted through the hole is slidably disposed along the axial direction;
A valve port (113) sealed by the valve rod (21) in the valve body storage chamber (114) hitting;
An opening (115) that is located between the hole and the valve port (113) and communicates the valve body accommodation chamber (114) and the valve chamber (121);
A first guide stage (111) provided on an outer edge or an inner edge of the valve seat (11) and used against a lower guide stage (321) of the nut (32) ;
Provided the inner edge portion of said valve body seat (11), an electric valve and having a second guide step of (112) and used against the guide step (211) of the valve stem (21).   The nut according to the fact that the first guide stage (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 port side. (32) The lower guide step (321) of the nut (32) is provided at the inner or outer edge of the nut (32) so as to be mated with the first guide step (111) of the valve body seat (11). The motor-operated valve according to claim 1, wherein the valve body seat (11) is positioned so as to fit the nut (32).   The valve seat (11) has a step portion at the outer edge or inner edge opposite to the valve mouth side, and the first guide step (111) is the step at the outer edge or inner edge. The motor-operated valve according to claim 2, wherein the motor-operated valve is a relatively upper cylindrical outer wall portion or an inner wall portion of a round hole.   The valve seat (11) has the stepped portion at the inner edge opposite to the valve mouth side, and the second guide step (112) is relatively out of the stepped portions at the inner edge. The motor-operated valve according to claim 3, wherein the motor-operated valve is an inner wall portion of an inner hole close to the valve port (113). The nut (32) has a screw step for mating with the lead screw (23) on the side opposite to the lower guide step side, and is mated with the lead screw (23) at the upper end or lower end of the screw step. The motor-operated valve according to any one of claims 1 to 4, further comprising a lead screw guide stage (322) . The motor-operated valve according to any one of claims 1 to 4, wherein the lead screw (23) and the valve stem (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 (21). The lead screw (23) passes through the valve stem cover (22) to enter the inner hole of the valve stem (21) and is in direct or indirect contact with the spring (25). The motor-operated valve according to claim 6.

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