JP5911706B2 - Motorized valve - Google Patents

Description

  The present invention relates to a motor-operated valve suitable for use in a heat pump type air conditioning system or the like, and in particular, a fluid is flowed in both directions (a first direction and a second direction opposite thereto) and at least one direction. Relates to a motor-operated valve corresponding to a flow path through which a large flow rate flows.

  Conventionally, as this type of electric valve, for example, a valve chamber, a lateral first inlet / outlet opening in the valve chamber, a vertical valve port opening in the valve chamber, and a second inlet / outlet connected to the valve port are provided. A valve body having a valve body disposed in the valve chamber so as to be able to be raised and lowered, an elevating drive means having an electric motor for raising and lowering the valve body, and opening the valve body A thing provided with the valve-opening spring biased in the direction is considered.

  In the motor-operated valve, the diameter of the valve opening and the diameter of the back pressure chamber defined above the valve body are set substantially the same, and the valve opening or the second inlet / outlet and the back pressure chamber are set. In order to communicate with the valve body, a pressure equalizing passage is provided so as to penetrate up and down the valve body, and the valve opening or the second inlet / outlet pressure is introduced into the back pressure chamber through the pressure equalizing passage, thereby closing the valve. In the state, the balance between the push-down force (force acting in the valve closing direction) acting on the valve body and the push-up force (force acting in the valve opening direction) is canceled (the differential pressure is canceled). It is also considered that the motorized valve can be used to reduce the size, increase the capacity, and save power (see, for example, Patent Document 1).

JP 2000-320711 A

  However, like the motor-operated valve described in Patent Document 1, the diameter of the valve port and the chamber diameter of the back pressure chamber are set to be substantially the same, and the valve body is vertically penetrated to cancel the differential pressure. When the fluid flows in the first direction (first inlet / outlet → second inlet / outlet), the force that pushes up the valve body rather than the force that pushes down the valve body when the valve is opened. When an upward load is generated on the valve body and fluid flows in the second direction (second inlet / outlet → first inlet / outlet), the valve is opened to the back pressure chamber via the pressure equalizing passage when the valve is opened. Since a large dynamic pressure is applied, the force that pushes down the valve body is greater than the force that pushes up the valve body when the valve is opened, a downward load is generated on the valve body, and the fluid flows in the first direction. When flowing in the direction of 2, the direction of the load acting on the valve body when the valve is opened changes. In this case, the downward load is a force that pushes down the valve body in the valve closing direction. Therefore, in order to be able to use the valve-opening spring with a smaller spring load, even when the fluid is flowed in the second direction, It is desirable that an upward load (a force acting in the valve opening direction) is generated.

  The present invention has been made in view of the above circumstances. The object of the present invention is to apply an upward load (acting in the valve opening direction) when the fluid flows in the second direction as well as the first direction. It is an object of the present invention to provide a motor-operated valve that can be reduced in size, increased in capacity, saved in power, and so on by using a valve-opening spring having a smaller spring load. .

In order to achieve the above object, the motor-operated valve according to the present invention basically includes a valve chamber, a first lateral inlet / outlet opening in the valve chamber, a vertical valve port opening in the valve chamber, and A valve body having a second inlet / outlet connected to the valve port; a valve body disposed in the valve chamber so as to be movable up and down to open and close the valve port ; and raising and lowering the valve body to open and close the valve port. a lift driving means having an electric motor order to control the flow of fluid from the fluid of the flow and second inlet and outlet from the first inlet and outlet, the valve opening spring for urging the valve body in the opening direction And a diameter of the valve opening and a chamber diameter of a back pressure chamber defined above the valve body are set to be substantially the same, and the valve body or the second inlet / outlet and the valve body are formed in the valve body. A linear pressure equalizing passage is provided to communicate with the back pressure chamber, and a small-diameter pressure equalizing conduit projects downward so as to extend the pressure equalizing passage downward. The homogeneous conduit together with the lower end is closed, said valve port to the second side surface substantially perpendicular to the direction of fluid flow of the second inlet and outlet to introduce only the static pressure from the inlet and outlet to the back pressure chamber It is characterized in that an opening is formed .

  In the motor-operated valve according to the present invention, when the fluid is flowed, for example, in the first direction, the force that pushes up the valve body is higher than the force that pushes down the valve body when the valve is opened, as in the conventional valve. Generates an upward load.

  On the other hand, when the fluid flows in the second direction, only the static pressure taken from the side opening that opens to the valve port or the second inlet / outlet is applied to the back pressure chamber when the valve is opened, and the dynamic pressure is Even when the flow in the second direction is not applied, the force for pushing up the valve body exceeds the force for pushing down the valve body at the time of opening the valve, and the valve body has a smaller upward direction than the flow in the first direction. A load is generated.

  Thus, not only in the first flow direction but also in the second flow direction, an upward load is generated on the valve body, so that a valve opening spring with a smaller spring load can be used. As a result, downsizing, large capacity, power saving, and the like can be achieved.

The valve closing state of 1st Example of the motor operated valve which concerns on this invention is shown, (A) is a longitudinal cross-sectional view, (B) is an enlarged detail drawing of the B section of (A). The longitudinal cross-sectional view which shows the valve opening state of 1st Example shown by FIG. The longitudinal cross-sectional view which shows the valve closing state of the reference example of the motor operated valve which concerns on this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a closed state of a motor-operated valve according to a first embodiment of the present invention, in which (A) is a longitudinal sectional view, (B) is an enlarged detailed view of part B of (A), and FIG. 1 is a longitudinal sectional view showing a valve open state of a motor operated valve according to a first embodiment shown in FIG.

  The illustrated motor-operated valve 1 is suitable for use as, for example, an expansion valve in a heat pump air-conditioning system, and a fluid (refrigerant) is flowed in both directions (the first direction and the opposite second direction), And it is a bidirectional | two-way flow-type motor-operated valve corresponding to the flow path through which a large flow volume flows at least in one direction.

  In the figure, a motor-operated valve 1 includes a valve body 5 having a cylindrical base 6 made of sheet metal, a valve body 20 disposed in the valve body 5 so as to be movable up and down, and a valve body 20 for raising and lowering the valve body 20. And a stepping motor 50 attached to the upper side of the main body 5.

  The tubular body 6 of the valve body 5 is formed with a valve chamber 7 and is fitted with a lateral first inlet / outlet (conduit joint) 11 that opens into the valve chamber 7. A valve seat member 8 formed with a vertical valve port 9 that opens to the valve chamber 7 is fixed, and a second inlet / outlet (conduit joint) 12 connected to the valve port 9 is attached to the valve seat member 8. It has been.

  A stepped cylindrical base 13 is attached to the upper surface opening of the cylindrical base 6, and the lower end of a can 58 constituting a part of the motor 50 is welded to the upper end of the base 13. It is joined. A cylindrical holding member 14 with a partition wall 14c is fixed to the inner peripheral side of the cylindrical base 13 by press-fitting or the like, and the upper part of the cylindrical holding member 14 is provided with a female screw 15i on the lower inner periphery so that it is threaded. The bearing member 15 is fixed by caulking. Immediately above the partition wall 14c of the cylindrical holding member 14 is a spring chamber 14a in which a valve opening spring 25 made of a compression coil spring is accommodated.

  The valve body 20 includes an inverted truncated cone-shaped valve body portion 20a that contacts and separates from the valve seat member 8 to open and close the valve port 9, an intermediate small-diameter portion 20b, and a large-diameter upper portion 20c. The upper diameter portion 20c is slidably fitted into the valve element guide hole 14b below the partition wall 14c in the cylindrical holding member 14.

  On the other hand, the stepping motor 50 is composed of a yoke 51, a bobbin 52, a coil 53, a resin mold cover 54, and the like. The stator 55 is externally fixed to the can 58, and is rotatably disposed in the can 58. 56 has a rotor 57 fixed to the inside of the upper portion thereof. Further, on the inner peripheral side of the rotor 57, a sun gear 41 provided integrally with the rotor support member 56, a fixed ring gear 47 fixed to the tip of a cylindrical body fixed to the cylindrical holding member 14, A planetary gear 42 that meshes with the sun gear 41 and the fixed ring gear 47, a carrier 44 that rotatably supports the planetary gear 42, a ring-shaped output gear 45 that meshes with the planetary gear 42, and an anchor to the output gear 45 A mysterious planetary gear type speed reduction mechanism 40 including the output shaft 46 and the like is provided. The number of teeth of the fixed ring gear 47 is different from the number of teeth of the output gear 45.

  An output shaft 46 is fixed to the output gear 45. A lower portion of the support shaft 49 is inserted through a hole provided in the upper portion of the output shaft 46, and the carrier 44 and the sun gear 41 (rotor support member 56) are inserted through the support shaft 49.

  The support member 48 has substantially the same diameter as the inner diameter of the can 58, and the upper portion of the can 58 and the rotor support member 56 are arranged inside the can 58. The upper portion of the support shaft 49 is inserted into a hole provided in the center portion of the support member 48.

  The output shaft 46 of the speed reduction mechanism 40 is rotatably inserted in the upper part of the bearing member 15 with a female thread, and the rotation of the output shaft 46 is provided in the bearing member 15 and is screwed into the screw 15i. The screw 17e is transmitted to a rotary elevating shaft 17 with a male thread. A slit-like fitting portion 46a is provided at the lower portion of the output shaft 46, and a plate-like portion 17a that is slidably fitted to the slit-like fitting portion 46a is provided on the rotary elevating shaft 17 so as to project. When the shaft 46 rotates, the rotary elevating shaft 17 is raised and lowered while rotating by the screw feed by the female screw 15i and the male screw 17e.

  A stepped cylindrical thrust transmission member 23 is disposed below the rotary elevating shaft 17 so as to transmit the thrust downward of the rotary elevating shaft 17 via the ball 18 and the ball seat 19. Since the ball 18 is interposed, only the downward thrust is transmitted from the rotary lift shaft 17 to the thrust transmission member 23 even if the rotary lift shaft 17 is lowered while rotating, and no rotational force is transmitted. .

  The thrust transmission member 23 includes, in order from the top, a large-diameter upper portion 23a in which the ball seat 19 is fitted on the inner periphery, and an intermediate body portion 23b that is slidably inserted into the partition wall 14c of the cylindrical holding member 14. The intermediate body portion 23b is formed of a small-diameter lower portion 23c having a diameter smaller than that of the intermediate body portion 23b. 32e is provided. The upper end opening of the through hole 32d is closed by the ball seat 19.

  The small diameter lower portion 23c of the thrust transmission member 23 is fitted and fixed to the upper fitting hole 20d of the valve body 20 by press fitting or the like, and the valve body 20 and the thrust transmission member 23 are moved up and down integrally. A pressing member 24 is sandwiched and fixed between the upper end surface of the valve body 20 and the lower end step portion of the intermediate body portion 23b of the thrust transmission member 23 when the small diameter lower portion 23c is press-fitted. A seal member 38 such as an O-ring is mounted between the annular groove provided at the upper end of the valve body 20 and the valve body guide hole 14b.

  A valve opening spring 25 made of a compression coil spring is disposed in the spring chamber 14a above the partition wall 14c of the cylindrical holding member 14 with its lower end in contact with the partition wall 14c. In order to transmit the urging force (lifting force) of the spring 25 to the valve body 20 via the thrust transmission member 23, a lifting spring receiving body 28 having hook-like hook portions 28a and 28b on the upper and lower sides is arranged. The upper hooking portion 28 a of the pulling spring receiving body 28 is placed on the valve opening spring 25, and the lower hooking portion 28 b is configured to hook the lower end step portion of the large-diameter upper portion 23 a of the thrust transmission member 23.

  Therefore, when the motor 50 (rotor 57) is rotated in one direction, the rotary elevating shaft 17 is lowered, for example, while being rotated by the screw feed by the female screw 15i and the external screw 17e. The transmission member 23 and the valve body 20 are pushed down against the urging force of the valve opening spring 25. Finally, the valve body portion 20a of the valve body 20 is seated on the valve seat shut-off portion 8a and the valve port 9 is closed. . On the other hand, when the motor 50 (rotor 57) is rotated in the other direction, for example, the rotary elevating shaft 17 is raised while being rotated by screw feed by the female screw 15i and the male screw 17e, and accordingly, the thrust transmission member 23 and the valve The body 20 is pulled up by the urging force of the valve opening spring 25, and the valve body portion 20a is lifted from the valve seat shut-off portion 8a to open the valve port 9.

  A back pressure chamber 30 is defined between the pressing member 24 and the partition wall 14 c of the cylindrical holding member 14 above the valve body 20. Here, in order to balance (cancel the differential pressure) the push-down force (force acting in the valve-closing direction) acting on the valve body in the valve-closed state and the push-up force (force acting in the valve-opening direction) acting on the valve body, The diameter of the back pressure chamber 30 and the diameter of the valve port 9 are set to be substantially the same. In addition, a through hole 32 c constituting a part of the pressure equalizing passage 32 is provided in the valve body 20 in order to allow the second inlet / outlet 12 and the back pressure chamber 30 to communicate with each other.

  Further, an upper portion of the straight pipe portion 22a of the small-diameter pressure equalizing conduit 22 constituting a part (lowermost portion) of the pressure equalizing passage 32 is fixed to the valve body portion 20a of the valve body 20 by press fitting or the like. . The pressure equalizing conduit 22 is projected downward from the lowermost surface 20e of the valve body 20a, and the lower end surface opening of the straight pipe portion 22a is closed by the inverted conical plug member 22b, and the lower end of the straight pipe portion 22a. A plurality of side openings 32a and 32a are formed in the peripheral wall portion, and only the sides are opened.

  Therefore, in the present embodiment, the pressure equalizing passage 32 for communicating the second inlet / outlet 12 and the back pressure chamber 30 is, in order from the bottom, side openings 32a and 32a provided in the lower peripheral wall of the pressure equalizing conduit 22, The internal passage 32b of the conduit 22, the through hole 32c inside the valve body 20 (including the lower part of the upper fitting hole 20d of the valve body 20), the through hole 32d in the thrust transmission member 23, and a plurality of openings that open to the back pressure chamber 30. It consists of a number of horizontal holes 32e.

  As described above, in the motor-operated valve 1 according to the first embodiment, the balance between the push-down force (force acting in the valve closing direction) acting on the valve body 20 and the push-up force (force acting in the valve opening direction) in the valve-closed state is the difference (difference). In order to cancel the pressure), the diameter of the back pressure chamber 30 and the diameter of the valve port 9 are set to be substantially the same, and the second inlet / outlet 12 and the back pressure chamber 30 are communicated with each other in the valve body 20. A straight pressure equalizing passage 32 (32c) is provided, and a small-diameter pressure equalizing conduit 22 projects downward so as to extend the pressure equalizing passage 32 downward, and the pressure equalizing conduit 22 (straight pipe portion) is provided. Since the lower end opening of 22a) is closed and only the side is opened, only the static pressure taken in from the side openings 32a and 32a is applied to the back pressure chamber 30 when the valve is opened, and no dynamic pressure is applied. . That is, when the valve is opened, total pressure (static pressure and dynamic pressure) is applied to the tip of the valve, but only the static pressure is applied to the back pressure chamber, so that the following effects can be obtained.

  When the fluid (refrigerant) flows in the first direction (first inlet / outlet 11 → second inlet / outlet 12) as shown by the solid line arrows in the figure, the valve body is opened when the valve is opened, as in the conventional case. The force that pushes up the valve body 20 exceeds the force that pushes down the valve body 20, and an upward load is generated in the valve body 20.

  On the other hand, when the fluid (refrigerant) flows in the second direction (second inlet / outlet 12 → first inlet / outlet 11) as indicated by the broken line arrows in the figure, the back pressure chamber 30 is opened when the valve is opened. Since only the static pressure taken in from the side openings 32a and 32a is applied, and no dynamic pressure is applied, the valve body 20 is pushed up more than the force that pushes down the valve body 20 when the valve is opened even in the flow in the second direction. The force is increased, and an upward load is generated in the valve body 20 although it is smaller than that in the flow in the first direction.

  Thus, not only in the first flow direction but also in the second flow direction, an upward load is generated on the valve body, so that the valve-opening spring 25 with a smaller spring load is used. As a result, it is possible to reduce the size, increase the capacity, and save power.

FIG. 3 shows a closed state of a reference example of the electric valve according to the present invention. In the motor-operated valve 2 of the reference example, portions corresponding to the respective portions of the motor-operated valve 1 of the first embodiment are denoted by common reference numerals, and redundant description thereof is omitted, and differences will be mainly described.

In the motor-operated valve 2 of this reference example, the pressure equalizing passage 32 as in the first embodiment is not provided in the valve body 20, and the pressure equalizing passage 33 is provided outside the valve body 20 and the valve chamber 7 (valve body 5). Is provided. The pressure equalizing passage 33 has a horizontal hole 33a that opens laterally in the peripheral wall portion of the second inlet / outlet 12 and most of the pressure equalizing passage 33 is arranged outside, and an upper side portion of the pressure equalizing passage 33 is inserted into the cylindrical base 6 and is held in a cylindrical shape. An internal passage 33c of, for example, a U-shaped conduit 34, which is inserted and fixed below the partition wall 14c of the member 14, and a lower side than the partition wall 14c of the cylindrical holding member 14 connected to the internal passage 33c and the back pressure chamber 30. It consists of a provided lateral hole 33b.

Since only the static pressure is applied to the back pressure chamber 30 by providing the pressure equalizing passage 33, the motor-driven valve 2 of the present reference example also has the first flow as in the first embodiment. Not only in the direction but also in the second flow direction, an upward load is generated on the valve body 20, so that the valve-opening spring 25 with a smaller spring load can be used. Miniaturization, large capacity, power saving, and the like can be achieved.

  The pressure equalizing passage 33 is not particularly required to be U-shaped, and it is sufficient that the side surface of the second inlet / outlet 12 or the valve port 9 and the back pressure chamber 30 communicate with each other.

  In the above description, the planetary gear mechanism is arranged between the motor and the valve body. However, without arranging the mechanism, the output of the motor is directly applied to the valve shaft via the screw mechanism. You may make it transmit.

  Furthermore, although the actuator for driving the valve body is a stepping motor, it is a matter of course that other types of motors may be used.

  Furthermore, it goes without saying that the motor-operated valve of the present invention can be applied not only to a heat pump air conditioning system but also to other systems.

1, 2 Motorized valve 5 Valve body 7 Valve chamber 8 Valve seat member 9 Valve port 11 First inlet / outlet 12 Second inlet / outlet 20 Valve body 20a Valve body portion 25 Opening spring 28 Lifting spring receiving body 30 Back pressure chamber 32 Average Pressure passage 32a Side opening 33 Pressure equalization passage 34 Conduit 33a Side hole 50 Stepping motor 55 Stator 57 Rotor

Claims (1)

A valve body having a valve chamber, a lateral first inlet / outlet opening in the valve chamber, a vertical valve port opening in the valve chamber, and a second inlet / outlet connected to the valve port; and opening and closing the valve port Therefore, the valve body arranged to be movable up and down in the valve chamber, the flow of fluid from the first inlet and outlet and the flow of fluid from the second inlet and outlet by opening and closing the valve body and opening and closing the valve port a lift driving means having an electric motor order to control, and a valve opening spring for urging the valve body in the opening direction, is defined above the valve body and the diameter of the valve port An electric valve in which the chamber diameter of the back pressure chamber is set to be substantially the same,
A straight pressure equalizing passage is provided in the valve body so as to communicate the valve port or the second inlet / outlet and the back pressure chamber, and the pressure equalizing conduit having a small diameter is provided so as to extend the pressure equalizing passage downward. Projecting downward, the pressure equalizing conduit is closed at the lower end, and the fluid at the second inlet / outlet is adapted to introduce only static pressure into the back pressure chamber from the valve port or the second inlet / outlet. A motor-operated valve characterized in that an opening is formed on a side surface orthogonal to the flow direction of .

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