JP4431414B2 - Double seat valve - Google Patents

Description

  The present invention relates to a double seat valve, and more particularly to a double seat valve for controlling a refrigerant flow rate in a refrigeration / refrigeration / air conditioning / hot water supply cycle.

  As a motorized valve that controls the flow rate of refrigerant in refrigeration, refrigeration, air conditioning, hot water supply cycle, etc., two valve ports are arranged opposite to each other on the same axis on the valve housing, and these two valve ports are formed as valve bodies There is a double seat valve that opens and closes depending on the part (for example, Patent Document 1).

  In the double seat valve, the valve opening / closing direction force due to the pressure difference between the valve upstream side and the valve downstream side acts on both of the two valve parts, so that it can be canceled (cancelled), and the driving force required for valve opening / closing is provided. It can be reduced and is suitable for a motor valve for high pressure and large flow rate such as a motor operated valve in a supercritical cycle using carbon dioxide refrigerant or the like in which the refrigerant pressure on the high pressure side is equal to or higher than the critical pressure of the refrigerant.

However, since the conventional double seat valve forms a flow path for each valve port in the valve housing, the valve housing becomes larger than a single seat valve, and the flow path becomes complicated and the flow rate becomes unstable. Easy to be. In addition, the overall structure is complicated, the number of parts is increased, operation failure is likely to occur, and the cost is increased.
JP 2001-324043 A

  The problem to be solved by the present invention is to provide a double seat valve having a simple structure, capable of stably performing highly accurate flow rate control, and capable of being downsized.

A double seat valve according to the present invention has a valve housing having a first inlet / outlet port and a second inlet / outlet port, a cylindrical member fixed to the valve housing, and an axial movement to a hollow portion of the cylindrical member. A rod-shaped valve body arranged in a possible manner, and a first valve port and a second valve port are formed concentrically on the same axis at a predetermined interval in the axial direction in the hollow portion of the cylindrical member The hollow portion has an end chamber on one side of the second valve port, and an intermediate chamber between the other side of the second valve port and one side of the first valve port. Each defining and communicating with the second inlet / outlet port on the other side of the first valve port, wherein the cylindrical member has an axial direction of the first valve port and the second valve port. A lateral hole that passes through the intermediate position in the radial direction and communicates with the intermediate chamber and the first inlet / outlet port is formed. Are, the valve body, said end chamber, the second valve port, extends across the intermediate chamber in the axial direction, the valve shaft portion extending to a side of the end chamber and having integrally A first valve land portion that opens and closes the first valve port by movement in the axial direction, a second valve land portion that opens and closes the second valve port, and the end chamber is connected to the second inlet / outlet port possess an internal passage that opens into said cylindrical member, have a bearing hole for movably supporting the valve shaft portion in the axial direction on the axis direction extension line of the end chamber, a valve seat in one piece It also serves as a member and a valve body support member .

  According to the double seat valve according to the present invention, the first inlet / outlet port → the side hole → the intermediate chamber → the first valve port → the second inlet / outlet port and the first inlet / outlet port → the side hole → the intermediate chamber. -> Second valve port-> end chamber-> internal passage-> another flow path by the second inlet / outlet port is formed, and the first valve land portion, the second valve according to the axial movement of the valve body The opening degree of the first valve port and the second valve port changes simultaneously by the land portion.

  The first inlet / outlet port → horizontal hole → intermediate chamber → first valve port → second inlet / outlet port has the same flow path configuration as the single seat valve, and the first inlet / outlet port → horizontal hole → middle The flow path of the chamber → second valve port → end chamber → internal passage → second inlet / outlet port is composed mainly of the internal passage of the valve body. The structure becomes simple and the valve housing can be miniaturized. In addition, the valve body does not become complicated in structure and shape only by forming a hollow internal passage.

In particular , the valve body integrally has a valve shaft portion extending toward the end chamber, and the cylindrical member can move the valve shaft portion in the axial direction on an extension line in the axial direction of the end chamber. It has a bearing hole for supporting the by Rukoto also serves as a valve seat member and the valve support member in one piece, reducing the number of parts is reduced, also concentricity of the valve port and the bearing hole is guaranteed The

  The double seat valve according to the present invention includes an electric motor such as a stepping motor, and a feed screw mechanism that is rotationally driven by the electric motor and converts a rotational motion of the electric motor into a linear motion. And the valve body are drivingly connected, and the valve body is driven in the axial direction by the feed screw mechanism. Thereby, an electric double seat valve is obtained.

According to the double seat valve according to the present invention, the flow path configuration equivalent to the single seat valve and the flow path configuration by the internal passage of the valve body constitute two systems of flow paths necessary for the double seat valve. The flow path structure in the valve housing is simplified, the valve housing can be miniaturized, and the valve body is not complicated in structure and shape only by forming a hollow internal passage. In addition, since the cylindrical member serves as both the valve seat member and the valve body support member, the number of parts can be reduced, and concentricity between the two valve ports and the bearing hole can be ensured. Reduction is planned.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  1 to 4 show Embodiment 1 of a double seat valve according to the present invention.

  The double seat valve according to the first embodiment is generally indicated by reference numeral 10. The double seat valve 10 has a valve housing 11. The valve housing 11 is formed with a first inlet / outlet port (inlet port) 12, a second inlet / outlet port (outlet port) 13, and a chamber 14.

  The first inlet / outlet port 12 is formed as a horizontal hole, and a horizontal joint 15 is connected to the first inlet / outlet port 12. The second inlet / outlet port 13 is formed as a pilot hole, and a lower joint 16 is connected to the second inlet / outlet port 13. The chamber 14 is in the shape of a horizontal hole and communicates directly with the first inlet / outlet port 12.

  The valve housing 11 is formed with upper and lower through holes 17A and 17B concentric with the second inlet / outlet port 13 above and below the chamber 14, and the cylindrical member 20 is fitted and fixed to the upper and lower through holes 17A and 17B.

  The cylindrical member 20 is fitted into the upper and lower through holes 17A at the tip portion 20A and directly communicates with the lower joint 16, extends across the chamber 14 up and down, and extends to the upper upper and lower through holes 17B at the intermediate portion 20B. It is mated. The cylindrical member 20 has a hollow shaft shape, and the first valve port 21 is provided by the first valve seat portion 23 and the second valve port 22 is provided by the second valve seat portion 24 in the hollow portion. It is formed concentrically at a predetermined interval in the direction. Note that the second valve port 22 has a slightly larger port diameter (a size through which a first valve land portion 31 described later can pass) than the first valve port 21 for assembly of the valve body.

  The hollow portion of the cylindrical member 20 includes an end chamber 25 on one side (upper side) of the second valve port 22, and one of the other side (lower side) of the second valve port 22 and the first valve port 21. The intermediate chambers 26 are respectively defined between the first valve port 21 and the lower joint 16 (second inlet / outlet port 13) on the other side (lower side) of the first valve port 21. is doing.

  A lateral hole 27 is formed in a radial direction in a portion where the cylindrical member 20 crosses the chamber 14 up and down. The lateral hole 27 penetrates the intermediate position in the axial direction between the first valve port 21 and the second valve port 22 in the radial direction, and passes through the intermediate chamber 26, the chamber 14, and the lateral joint 15 (the first inlet / outlet port 12. ).

  Four horizontal holes 27 are formed in a cross for every 90 degrees of rotation angle. Thereby, the positional relationship between the lateral hole 27 and the first inlet / outlet port 12 is hardly influenced by the circumferential mounting position of the cylindrical member 20 with respect to the valve housing 11, and the circumferential direction of the cylindrical member 20 with respect to the valve housing 11 is reduced. There is no need to specify the mounting position (positioning in the circumferential direction). Therefore, the cylindrical member 20 can be assembled to the valve housing 11 at an arbitrary circumferential position.

  The cylindrical member 20 has first and second bearing holes 28 that support a valve shaft portion 33 of a valve body 30 (described later) movably in the axial direction (vertical direction) on an extension line (upper side) in the axial direction of the end chamber 25. The valve ports 21 and 22 are formed concentrically. Thereby, the cylindrical member 20 is one component, and serves as the valve seat member and the valve body support member.

  A rod-shaped valve body 30 is disposed in the hollow portion of the cylindrical member 20 so as to be movable in the axial direction. The valve body 30 has a solid shaft shape (round bar shape) that extends across the end chamber 25, the second valve port 22, and the intermediate chamber 26 in the axial direction and extends toward the end chamber 25 (upper side). The valve shaft portion 33 is integrally supported, and the valve shaft portion 33 is supported by the cylindrical member 20 by being fitted in the bearing hole 28 of the cylindrical member 20 so as to be movable in the axial direction. By this fitting, the valve body 30 is supported so as to be movable in the axial direction with respect to the valve housing 11 via the cylindrical member 20.

  The valve body 30 includes a conical first valve land portion 31 that opens and closes the first valve port 21 by axial movement, and a conical second valve that opens and closes the second valve port 22 by the same axial movement. And a valve land portion 32.

  The distal end (lower end) of the valve body 30 faces the lower joint 16, and a drilled hole 34 </ b> A having a bottom from the distal end is formed in the valve body 30, and the valve body 30 is located at a portion located in the end chamber 25. The lateral hole 34B is penetrated in the radial direction. Thereby, the drill hole 34A and the lateral hole 34B form an internal passage 34 that opens the end chamber 25 to the lower joint 16 (second inlet / outlet port 13). Note that four horizontal holes 34B are also formed in a cross for every 90 degrees of rotation angle.

  An upper part 20 </ b> C of the cylindrical member 20 protrudes from the upper part of the valve housing 11, and a lower lid member 35 is fixed concentrically with the cylindrical member 20 at this part. A rotor case 41 of a stepping motor 40 is airtightly butt welded to the lower lid member 35. The rotor case 41 has a can shape having a cylindrical portion 41A and a hemispherical dome portion 41B that is integrally formed with the cylindrical portion 41A and closes the upper end of the cylindrical portion 41A, and is entirely nonmagnetic such as stainless steel having the same thickness. It is composed of the body.

A rotor 42 is rotatably disposed inside the cylindrical portion 41 </ b> A of the rotor case 41. The rotor 42 has a multi-pole magnetized outer periphery. A cylindrical female screw member 43 is fixed to the center of the rotor 42. Female screw member 43 and the rotor 42, the connecting member 44, the fixing bracket 45, the collar member 46, which is the upper end 33A and the relatively rotatable connection of the valve body 30 by a spring 47 or the like.

  A male screw member 36 is concentrically fixed to the upper end portion 20D of the cylindrical member 20. The male screw member 36 has a hollow shaft shape, and the valve shaft portion 33 of the valve body 30 passes through the hollow portion 36A. A male screw 36B is formed on the outer peripheral surface of the male screw member 36, and the male screw 36B is engaged with a female screw 43A formed on the inner peripheral surface of the female screw member 43. The rotation of the rotor 42 is converted into linear motion by this screw engagement.

  A stator assembly 48 of the stepping motor 40 is positioned and mounted on the outer periphery of the rotor case 42 by a locking piece 49. The stator assembly 48 includes an outer casing 50, upper and lower two-stage stator coils 51, a plurality of magnetic pole teeth 52, an electrical connector portion 53, and the like, and is hermetically sealed with a sealing resin 54.

  A stopper holding rod 55 is suspended and fixed inside the hemispherical dome portion 41B. A helical guide 56 is attached to the stopper holding rod 55, and a movable stopper 57 is engaged with the helical guide 56.

  When the movable stopper 57 is kicked around by the pin 58 attached to the rotor 42, the movable stopper 57 is guided by the spiral guide 56 as the rotor 42 rotates and moves up and down while turning. The movable stopper 57 abuts against the stopper portion 59 at the lower end of the stopper holding rod 55 or the stopper portion 60 at the upper end of the spiral guide 56 to limit the rotation of the rotor 42 in the valve closing direction or the valve opening direction. .

  The stepping motor 40 rotationally drives the rotor 42 by energizing the stator coil 51. When the rotor 42 rotates, the rotational motion of the rotor 42 is converted into linear motion by the screw engagement between the female screw 43A and the male screw 36B, and the rotor 42 moves in the rotor case 41 in the axial direction (vertical direction). The movement of the rotor 42 in the axial direction is transmitted to the valve body 30, and the valve body 30 moves in the axial direction (vertical direction).

  Thereby, the first valve land portion 31 of the valve body 30 adjusts the opening degree of the first valve port 21, and the second valve land portion 32 of the valve body 30 opens the opening degree of the second valve port 22. Thus, substantially the same flow rate control is performed at both the first valve port 21 and the second valve port 22.

  Under this flow control, the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → lateral hole 27 → intermediate chamber 26 → first valve port 21 → lower joint 16 (second inlet / outlet port 13) And the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → lateral hole 27 → intermediate chamber 26 → second valve port 22 → end chamber 25 → internal passage 34 → lower joint 16 (second joint 16) A fluid such as a refrigerant flows through another channel by the inlet / outlet port 13).

  The flow path by the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → lateral hole 27 → intermediate chamber 26 → first valve port 21 → lower joint 16 (second inlet / outlet port 13) is a single seat valve. The flow path configuration is the same as the flow path, and the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → lateral hole 27 → intermediate chamber 26 → second valve port 22 → end chamber 25 → internal passage 34 → lower Since the flow path by the joint 16 (second inlet / outlet port 13) is mainly constituted by the internal passage 34 of the valve body 30, the flow path configuration in the valve housing 11 as a double seat valve is simplified, The valve housing 11 can be downsized. Further, since the valve body 30 only needs to form the hollow internal passage 34, the structure and shape of the valve body 30 are not complicated.

  Further, since the cylindrical member 20 is a single component and serves as both a valve seat member and a valve body support member, the concentricity between the first and second valve ports 21 and 22 and the bearing hole 28 is highly guaranteed. In addition, the number of parts can be reduced.

FIG. 5 shows one embodiment of a hot water supply cycle apparatus using a CO2 refrigerant (carbon dioxide refrigerant) in which the double seat valve 10 of the first embodiment is used.

This hot water supply cycle apparatus is a heat pump type hot water heater, and a CO 2 refrigerant circulation path including a compressor 71, a gas cooler 72 corresponding to a condenser, an electric double seat valve 10 and an evaporator 73 is configured. Heat exchange is performed between the high-temperature CO2 refrigerant passing therethrough and the cold water in the hot water tank 74 to produce hot water.

It is sectional drawing which shows Embodiment 1 of the double seat valve by this invention. It is an expanded sectional view of the important section of Embodiment 1 of the double seat valve by this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a block diagram which shows one Embodiment of the hot water supply cycle apparatus using the CO2 refrigerant | coolant to which the double seat valve by this invention is applied .

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Double seat valve 11 Valve housing 12 1st inlet / outlet port 13 2nd inlet / outlet port 20 Cylindrical member 21 1st valve port 22 2nd valve port 25 End chamber 26 Intermediate | middle chamber 28 Bearing hole 30 Valve body 31 1st 1 of the valve land portion 32 and the second valve land portion 33 valve stem 34 inside passage 36 externally threaded member 40 the stepping motor 41 rotor casing 42 rotor 43 internally threaded member 48 stator assembly

Claims (2)

A valve housing having a first inlet / outlet port and a second inlet / outlet port;
A cylindrical member fixed to the valve housing;
A rod-shaped valve body arranged to be movable in the axial direction in the hollow portion of the cylindrical member;
In the hollow portion of the cylindrical member, a first valve port and a second valve port are formed concentrically on the same axis at a predetermined interval in the axial direction,
The hollow portion defines an end chamber on one side of the second valve port and an intermediate chamber between the other side of the second valve port and one side of the first valve port. And communicating with the second inlet / outlet port on the other side of the first valve port,
The cylindrical member is formed with a lateral hole that passes through the axial intermediate position between the first valve port and the second valve port in the radial direction and communicates the intermediate chamber and the first inlet / outlet port. And
The valve body extends in the axial direction across the end chamber, the second valve port, and the intermediate chamber, and integrally includes a valve shaft portion extending toward the end chamber, and moves in the axial direction. A first valve land portion that opens and closes the first valve port, a second valve land portion that opens and closes the second valve port, and an interior that opens the end chamber to the second inlet / outlet port. possess a passage,
The cylindrical member has a bearing hole for supporting the valve shaft portion so as to be movable in the axial direction on an extension line in the axial direction of the end chamber, and serves as both a valve seat member and a valve body support member with one component. Yes,
A double seat valve characterized by that. An electric motor, and a feed screw mechanism that is rotationally driven by the electric motor and converts the rotational motion of the electric motor into a linear motion, wherein the feed screw mechanism and the valve body are drivingly connected, and the feed screw mechanism double seat valve according to claim 1 wherein characterized in that the valve body is driven in the axial direction by.

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