JP2005048943A - Electronic control valve, valve seat cleaning method, and method of controlling position of valve element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic control valve capable of demounting a driving device without cutting pipes, eliminating the contamination of a valve seat, and having high maintenance performance in a case when the failure occurs in the flow rate control driving device such as a solenoid coil and a motor used in a control valve such as an expansion valve for controlling a flow rate of the fluid such as a refrigerant used in an air conditioner and a refrigerator. <P>SOLUTION: In this electronic control valve having a stator core of a stepping motor on an outer peripheral part of a casing 8 of the electronic control valve with a divisible structure, and controlling the flow rate of the fluid by opening and closing a flow channel in axial flow, a valve element 3 partially composed of a ferromagnetic member is mounted in the axial flow of the fluid flowing in the casing 8, and a cleaning disc 11 or a cleaning edge 12 is mounted in the casing 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic control valve that adjusts a flow rate using a stepping motor, and more particularly to an electronic control valve used in an air conditioner and a refrigerator, a valve seat cleaning method thereof, and a valve body position control method.

  Conventionally, for an expansion valve used for a control valve for the flow rate of an air conditioner, etc., the material of the flow path material through which the refrigerant flows as shown in FIG. 6 is copper, the valve seat is brass alloy, It has a housing made of stainless steel and several kinds of materials, and the expansion valve is arranged in a structure that bends the refrigerant flow by 90 degrees. When a voltage is applied to the excitation coil 1 of the expansion valve, the magnet 2 and the valve body shaft 3 are integrated. The valve body with the above structure reciprocates to open and close the valve seat. Some control the opening and closing of the expansion valve (see, for example, Patent Document 1).

  Furthermore, a control valve using a solenoid coil as a motor-driven expansion valve and having a linear fluid inlet / outlet has also been proposed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 3-36770 Japanese Patent No. 2848812

  However, the use of an expansion valve that bends the refrigerant flow to 90 degrees proposed in Patent Document 1 has a complicated structure on the system because the valve body is arranged perpendicular to the axial flow. A large piping space is required. In addition, since it is a case made of several types of materials, it is necessary to join each of them by brazing or the like, which causes a problem of increased processing costs, and also causes a problem of refrigerant leakage due to poor brazing. is doing.

  In addition, the electric expansion valve proposed in Patent Document 2 is: (a) When the solenoid coil breaks down because the solenoid coil and the housing are integrated, the coil and the housing cannot be divided and the piping is cut. The solenoid coil must be removed by doing so, etc., and maintenance is not good at the time of failure. (B) The valve seat is blocked by sludge or contamination powder clogging the valve seat, reducing the refrigerant flow rate. (C) When the valve seat is closed, the needle portion of the valve body is fixed to the valve seat, so that a large torque is required when the valve body is first moved. (D) The valve body In the position control, the valve body position may be controlled after the valve body position is fully closed temporarily. In this case, the valve body and the valve seat are caught, and the magnetic force from the stator core is magnetized. Torque is fully obtained, biting Problems such as it may not be possible to release the body has occurred.

  The present invention has been made in view of the above problems, and in response to various problems of such control valves, when a drive device such as a solenoid coil fails, the drive device is not cut. The present invention provides an electronic control valve that can be removed and that can remove the contamination of the valve seat and is excellent in maintainability, a valve seat cleaning method, and a valve body position control method.

  In order to solve the above-described problems and achieve the object, the electronic control valve according to the present invention can divide the stator core of the stepping motor in the electronic control valve that controls the fluid flow rate by opening and closing the flow path in the axial flow. It is characterized by having a simple structure.

  According to a second aspect of the present invention, there is provided an electronic control valve for controlling a fluid flow rate by opening and closing a flow path in an axial flow, wherein a cleaning disk or a cleaning edge is provided in a housing of the electronic control valve. It is characterized by.

  According to a third aspect of the present invention, there is provided an electronic control valve for controlling a fluid flow rate by opening and closing a flow path in an axial flow, wherein a stopper pin and a stopper are provided in a housing of the electronic control valve. It is characterized by being.

  An electronic control valve according to a fourth aspect of the invention is an electronic control valve that controls a fluid flow rate by opening and closing a flow path in an axial flow, and is arranged in a casing of the electronic control valve with a severable structure. A stator core of a stepping motor, and a valve body partly made of a ferromagnetic material in an axial flow through which fluid flows in the housing, and provided with a structure that reciprocates while the valve body rotates. It is characterized by being.

  An electronic control valve according to a fifth aspect of the present invention is an electronic control valve that controls the fluid flow rate by opening and closing a flow path in the axial flow, and is disposed in the case of the electronic control valve in a separable structure. A stator core of a stepping motor, a valve body partially composed of a ferromagnetic material in an axial flow through which fluid flows in the housing, and a cleaning disk or a cleaning edge provided in the housing. Features.

  The electronic control valve according to a sixth aspect of the invention is characterized in that a stopper pin and a stopper for controlling the circumferential movement of the valve body are provided in the casing.

  The electronic control valve according to the invention of claim 7 is characterized in that, in the above invention, the casing is formed of a tubular body made of copper or a copper alloy.

  An electronic control valve according to an eighth aspect of the present invention is characterized in that, in the above invention, at least a part of the valve seat and the valve body is made of resin or coated with resin.

  The electronic control valve according to the invention of claim 9 is characterized in that, in the above invention, the resin is a fluororesin.

  According to a tenth aspect of the present invention, there is provided a valve seat cleaning method for an electronic control valve, wherein a valve body having a cleaning disk or a cleaning edge is disposed in the flow path of a valve seat having a flow path facing the valve body. Dirt adhering to the valve seat is removed by reciprocating motion.

  In addition, the valve body position control method according to the invention of claim 11 uses a stopper mechanism comprising a stopper pin and a stopper for the circumferential movement of the valve body having a screw portion and having a mechanism that reciprocates while rotating. The valve body is introduced into a reference position by controlling.

  The electronic control valve according to the present invention can be easily and quickly replaced without cutting the pipe when the stator core is broken by making the stator core of the stepping motor separable. In addition, dirt such as sludge and contamination collected in the valve seat is always removed by the cleaning disc or cleaning edge provided on the valve body, and a clean valve seat can be provided, eliminating the problem of flow reduction and driving. The electronic control valve can be reduced in size without requiring a large torque at the start, and a remarkable industrial effect can be achieved.

  Since the electronic control valve according to the present invention has a valve body in the fluid flow path, a space for a special electronic control valve is not required as in the prior art, and there are few restrictions due to piping space. Also, if the valve body is present in the fluid flow path, if the stator core of the stepping motor is damaged, the only way to remove it is to cut the piping. When the stator core is damaged, the stator core can be easily replaced without cutting the pipe.

  In the electronic control valve according to the present invention, the cleaning disc or the cleaning edge is provided on the valve body. When the use of the electronic control valve becomes longer, the valve seat that controls the flow rate together with the valve body has sludge and Contamination powder may clog and control the flow rate of fluid, but by providing a cleaning disc or cleaning edge on the valve body, these contaminants are removed by interaction with the valve seat when the valve body reciprocates. As a result, the fluid flow rate can be controlled as designed.

  The electronic control valve according to the present invention is provided with a stopper pin and a stopper in the housing. In particular, the installation of the stopper pin on the valve body in the flow path, the installation of the stopper on the valve body or the screw portion, etc. In position control, the valve body position is not temporarily fully closed, but the valve body is stopped by a stopper provided in the circumferential direction, and the control system recognizes the position of the valve body to eliminate biting. Therefore, the required torque by the stator core and the magnet can be reduced. One of the stopper and the stopper pin moves in the circumferential direction, and this is fixed in the circumferential direction and stopped by the other movable in the flow axis direction. However, the positions of the stopper and the stopper pin are limited. It goes without saying that it is not a thing.

  In the electronic control valve according to the present invention, the housing is made of copper or a copper alloy, so that the number of parts can be reduced, and the valve body is fixed by drawing, so that brazing is not required and the manufacturing cost is reduced. Can do. Furthermore, since the connection with a normal air conditioning pipe using a copper pipe is brazed with copper or a copper alloy, there is an effect that it can be assembled by an inexpensive brazing such as a phosphor copper brazing. .

  The electronic control valve according to the present invention has an effect of preventing dirt adhering to the valve seat and the valve body by constituting at least a part of the valve seat and the valve body with, for example, a fluororesin.

  Hereinafter, an embodiment of an electronic control valve according to the present invention will be described in detail based on the drawings of FIGS. The present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the present invention.

(Embodiment)
1 and 2 are a cross-sectional view showing one embodiment of an electronic control valve according to the present invention and a cross-sectional view when the stator core shown in FIG. 1 is divided into three parts. 3 and 4 show the cleaning state of the electronic control valve according to the present invention having a cleaning device for removing dirt such as sludge and contaminant powder accumulated in the valve seat. FIG. 5 schematically shows the form of dirt accumulated in the valve seat of the electronic control valve. 6 and 7 show a valve seat cleaning method according to the present invention. FIG. 8 is a schematic view showing an embodiment of a radial stopper and a stopper pin provided on the valve body.

  In FIG. 1, the fluid flows from the fluid inlet 5 and is discharged from the fluid outlet 6. Components such as the valve body 3 and the screw portion 7 integrated with the magnet 2 are arranged along the fluid flow path inside the casing 8 made of copper tube, and the valve body is inserted into the casing 8 from the entrance / exit. 9a and 9b are inserted and the casing 8 is drawn to fix the valve bodies 9a and 9b so that fluid does not leak.

  When current flows through the divided stator core 10, the valve body 3 opens and closes the valve seat 4 by reciprocating linearly while rotating by the action of the magnet 2 integrated with the valve body 3. The flow rate is adjusted by controlling the open / close state.

  The divided stator core 10 is attached by arranging the stator core 10 in a plurality of divided states around the outer periphery of the copper tube casing 8 so as to surround the outer periphery of the stator core 10. For example, a method of fixing with a covering band or a method of screwing the blocks 10a together.

  As for the division of the stator core 10, a plane parallel to the axial direction of the valve body 3 is used as a division plane, whereby the divided stator core 10 is attached so as to cover the outside of the housing 8, and can be removed and replaced. The number of divisions may be plural, but it is preferably divided into two or three from the viewpoint of ease of attachment and cost. FIG. 2 shows an example in which the stator core 10 is divided into three.

  The flow rate may be adjusted by energizing the stator core 10 divided so as to be adjustable depending on the position of the valve body 3, and the opening degree is finely adjusted by adjusting the number of steps of the stepping motor.

  3 and 4, the valve body tip 3 a of the valve body 3 is larger than the outer diameter of the valve body tip 3 a and can pass through the valve seat hole 4 a to remove dirt accumulated in the valve seat 4. Parts for cleaning the valve seat 4 (valve seat hole 4a) such as the cleaning disk 11 or the cleaning edge 12 having a sufficient size are provided.

  In these cleaning parts, as shown in FIG. 5, when the dirt 15 that closes the fluid flow path is accumulated in the valve seat 4 (valve seat hole 4a), the valve body 3 is moved to the cleaning position shown in FIG. The valve body 3 is reciprocated between the two positions indicated by the control position and the dirt 15 is removed by the cleaning disk 11 to reduce the decrease in the fluid flow rate caused by the blockage of the flow path. Since the seat 4 is cleaned, a large torque is not required at the start of operation, so the entire electronic control valve is reduced in size.

  FIG. 8 shows an embodiment of a valve body stopper device 16 that operates in the circumferential direction, and performs origin confirmation as a basis for position control of the valve body 3. That is, the origin position of the valve body 3 is set by moving the valve body 3 to the stop position by the stopper 19 once.

  The stopper device 16 has a stopper pin 17 provided in the circumferential direction of the valve body 3 and one end thereof in contact with or coupled to the bottom surface of the stopper holder 18, and the other end in contact with or coupled to the stopper 19. It comprises a stopper holder 18 having a stopper 19 having a spring 20 and a stopper claw 21 in the operating direction.

  The stopper pin 17 hits the B portion of the stopper claw 21 and the valve body 3 stops. When the stopper pin 17 hits the A portion of the stopper claw 21, the stopper 19 is moved in the flow axis direction by the spring 20 and stops at the B portion of the next stopper claw 21. In this way, the position of the valve body 3 can be controlled.

  Further, in this embodiment, at least a part of the valve body 3 and the valve seat 4, for example, the surfaces of the valve body 3 and the valve seat 4 can be made of non-adhesive resin. For this purpose, for example, a resin is formed on the surfaces of the valve body 3 and the valve seat 4 with a resin coating. In this case, the method for forming the coating is not particularly limited as long as a non-adhesive resin is applied to the surface. However, the coating method is not limited, but a fluororesin such as PTFE (polytetrafluoroethylene (tetrafluoride)) ), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), FEP (tetrafluoroethylene / hexafluoropropylene copolymer (4.6 fluoride)), PCTFE (polychlorotrifluoroethylene (trifluoride)) ), ECTFE (ethylene / chlorotrifluoroethylene copolymer), PVdF (polyvinylidene fluoride (difluoride)), ETFE (tetrafluoroethylene / ethylene copolymer), etc. in the electroless nickel plating film In addition to the non-adhesive effect, the film co-deposited on the surface has durability and friction. Since the number cut into small back, and superior to the operation of the electronic control valve preferably.

  Thus, in this embodiment, since the surfaces of the valve body and the valve seat are made of non-adhesive resin, it becomes difficult for dirt to adhere to these surfaces, and dirt can be prevented. Also, in this embodiment, for example, the fluororesin coating improves lubricity, so that the effect of smooth driving of the valve body at the screw portion is obtained, which is preferable.

It is sectional drawing which shows one of the embodiments of the electronic control valve concerning this invention. It is sectional drawing at the time of dividing the stator core shown in FIG. 1 into 3 parts. It is sectional drawing which shows an example of the electronic control valve concerning this invention provided with the cleaning disk. It is sectional drawing which shows the other example of the electronic control valve concerning this invention provided with the cleaning edge. It is the schematic diagram which showed the form of the dirt which accumulates in the valve seat of an electronic control valve. It is sectional drawing (at the time of cleaning) which shows the cleaning method of a valve seat. It is sectional drawing (at the time of position control) which shows the cleaning method of a valve seat. It is a schematic diagram which shows embodiment of the stopper pin provided in the radial stopper and the valve body. It is sectional drawing which shows one Example of the expansion valve of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excitation coil 2 Magnet 3 Valve body 3a Valve body front-end | tip part 4 Valve seat 5 Fluid inflow port 6 Fluid discharge port 7 Screw part 8 Housing | casing 9a Valve body (with valve seat)
9b Valve body 10 Stator core 10a Block 11 Cleaning disk 12 Cleaning edge 13 Leakage hole 14 Assembly screw part 15 Dirt such as sludge and contamination powder 16 Stopper device 17 Stopper pin 18 Stopper holder 19 Stopper 20 Spring 21 Stopper claw

Claims (11)

In an electronic control valve that controls the fluid flow rate by opening and closing the flow path in the axial flow,
An electronically controlled valve characterized in that a stator core of a stepping motor is arranged in a splittable structure. In an electronic control valve that controls the fluid flow rate by opening and closing the flow path in the axial flow,
An electronic control valve, wherein a cleaning disk or a cleaning edge is provided in a housing of the electronic control valve. In an electronic control valve that controls the fluid flow rate by opening and closing the flow path in the axial flow,
An electronic control valve characterized in that a stopper pin and a stopper are provided in a housing of the electronic control valve. In an electronic control valve that controls the fluid flow rate by opening and closing the flow path in the axial flow,
A stator core of a stepping motor disposed in a housing of the electronic control valve with a severable structure;
A valve body partially composed of a ferromagnetic material in an axial flow through which a fluid flows in the housing;
The electronic control valve is provided with a structure in which the valve body reciprocates while rotating. In an electronic control valve that controls the fluid flow rate by opening and closing the flow path in the axial flow,
A stator core of a stepping motor disposed in a housing of the electronic control valve with a severable structure;
A valve body partially composed of a ferromagnetic material in an axial flow through which a fluid flows in the housing;
A cleaning disk or cleaning edge provided in the housing;
An electronic control valve comprising:   The electronic control valve according to claim 4 or 5, wherein a stopper pin and a stopper for controlling the circumferential movement of the valve body are provided in the casing.   The electronic control valve according to claim 1, wherein the casing is formed of a tubular body made of copper or a copper alloy.   The electronic control valve according to any one of claims 1 to 7, wherein at least a part of the valve seat and the valve body is made of resin or coated with resin.   The electronic control valve according to claim 8, wherein the resin is a fluororesin.   A valve body having a cleaning disk or a cleaning edge removes dirt adhered to the valve seat by reciprocating in the flow path of a valve seat having a flow path facing the valve body. Electronic valve seat cleaning method.   The valve body is introduced to a reference position by controlling the circumferential movement of the valve body having a screw portion and having a mechanism that reciprocates while rotating by using a stopper mechanism constituted by a stopper pin and a stopper. A valve body position control method.

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