WO2005073604A1

WO2005073604A1 - Double seat valve

Info

Publication number: WO2005073604A1
Application number: PCT/JP2004/010627
Authority: WO
Inventors: Hiroshi Uchida; Hideki Sekiguchi; Michiaki Ohno
Original assignee: Kabushiki Kaisha Saginomiya Seisakusho
Priority date: 2004-01-30
Filing date: 2004-07-26
Publication date: 2005-08-11

Abstract

A double seat valve formed in a simple structure, capable of accurately and stably performing flow control, and enabling a reduction in size, comprising one flow passage formed of a lateral joint (15) → a lateral hole (27) → an intermediate chamber (26) → a first valve port (21) → a lower joint (16) and the other flow passage formed of the lateral joint (15) → the lateral hole (27) → the intermediate chamber (26) → a second valve port (22) → an end chamber (25) → an internal passage (34) → the lower joint (16).

Description

Specification

Double seat valve

Technical field

The present invention relates to a double-seat valve, and more particularly, to a double-seat valve that controls the flow rate of a refrigerant in a refrigeration, “refrigeration,” air conditioning, and hot water supply cycle.

Background art

[0002] As an electric valve for controlling a refrigerant flow rate in a refrigeration 'refrigeration' air conditioning 'hot water supply cycle or the like, two valve ports are arranged on a valve housing on the same axis to face each other, and the two valve ports are formed into a valve body. There is a double-seat valve that opens and closes with each of the two valve sections (for example, Patent Document 1).

[0003] In a double-seat valve, a valve opening / closing direction force due to a pressure difference between a valve upstream side and a valve downstream side acts on both of the two valve sections, thereby canceling (cancelling) the two forces. Suitable for high-pressure, large-flow motorized valves, such as motorized valves used in supercritical cycles using carbon dioxide refrigerant, etc., in which the driving force can be reduced and the high-pressure side refrigerant pressure exceeds the critical pressure of the refrigerant. ,

[0004] However, in the conventional double-seat valve, since a flow passage for each valve port is formed in the valve housing, the valve housing becomes larger than a single-seat valve, the flow passage becomes complicated, and the flow rate increases. It is easy to become unstable. In addition, the overall structure is complicated, the number of parts is increased, and the cost is high, which is likely to cause malfunctions.

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-324043

Disclosure of the invention

Problems to be solved by the invention

[0005] The problem to be solved by the present invention is to provide a double-seat valve that has a simple structure, can stably perform high-precision flow control, and can be downsized.

Means for solving the problem

[0006] The double-seat valve according to the first invention is a valve housing having a first inlet / outlet port and a second inlet / outlet port, a cylindrical member fixed to the valve housing, and a hollow portion of the cylindrical member. A rod-shaped valve body arranged so as to be movable in the axial direction, and the cylindrical member has 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, and the hollow portion has an end on one side of the second valve port. Chambers are respectively defined between the other side of the second valve port and one side of the first valve port, and the second chamber is defined on the other side of the first valve port. The first and second valve ports communicate with the first chamber port and the second valve port in the radial direction through the cylindrical member. A lateral hole communicating with an outlet port is formed, and the valve element extends axially across the end chamber, the second valve port, and the intermediate chamber, and moves in the first direction by axial movement. A first valve land for opening and closing the second valve port, a second valve land for opening and closing the second valve port, and the end chamber. And an internal passage that opens into the second inlet and outlet ports.

[0007] The double-seat valve according to the second invention is provided with a valve housing having a first inlet / outlet port and a second inlet / outlet port, and movably arranged in the axial direction with respect to the valve housing. A first valve chamber directly communicating with the first inlet / outlet port, a second valve chamber, and one side of the first valve chamber. A first valve port formed on the other side of the first valve chamber and communicating with the second inlet / outlet port; and a second valve port formed on the same axis as the first valve port and arranged on the same axis. A second valve port communicating with the first valve chamber, the valve body extending in the axial direction across the first valve chamber and the second valve chamber; A first valve land for opening and closing the first valve port by directional movement, a second valve land for opening and closing the second valve port, and the second valve chamber And an internal passage opening to the second inlet / outlet port.

The invention's effect

[0008] According to the double-seat valve of the present invention, the two flow paths required for the double-seat valve are formed by the flow path configuration equivalent to that of the single-seat valve and the flow path configuration by the internal passage of the valve element. The structure of the flow passage in the valve housing as a double-seat valve is simplified, the size of the valve housing can be reduced, and the structure and shape of the valve body become complicated simply by forming a hollow internal passage. There is no.

That is, according to the double-seat valve of the first invention, the first inlet / outlet port → the side hole → the intermediate chamber → the first valve port → the second inlet / outlet port has the first inlet / outlet port. Outlet port → Side hole → Intermediate chamber → Second valve port → End chamber → Internal passage → Another flow path with second inlet / outlet port Is formed, and the opening degrees of the first valve port and the second valve port are simultaneously changed by the first valve land portion and the second valve land portion in accordance with the axial movement of the valve element.

[0010] The flow path from the first inlet / outlet port → side 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 → Since the main part of the flow passage from the side hole → intermediate chamber → second valve port → end chamber → internal passage → second inlet / outlet port is constituted by the internal passage of the valve body, the valve housing as a double seat valve In this case, the flow path configuration is simplified, and the size of the valve housing can be reduced. Also, the valve body does not become complicated in structure and shape only by forming a hollow internal passage.

[0011] Further, according to the double-seat valve according to the second aspect of the invention, the first inlet / outlet port → the first valve chamber → the first valve port → the second inlet / outlet port has a first passage and a second passage. An inlet / outlet port → 1st valve chamber → 2nd valve port → 2nd valve chamber → internal passage → Another flow path by the 2nd inlet / outlet port is formed, and according to the axial movement of the valve element Accordingly, the opening degrees of the first valve port and the second valve port are simultaneously changed by the first valve land portion and the second valve land portion.

[0012] The flow path from the first inlet / outlet port → the first valve chamber → the first valve port → the second inlet / outlet port has the same flow path configuration as a single-seat valve. → The first valve chamber → the second valve port → the second valve chamber → the internal passage → The flow path by the second inlet / outlet port is composed of the internal passage of the valve body, so the double seat The flow path configuration in the valve housing as a valve is simplified, and the size of the valve housing can be reduced. Also, the valve body does not become complicated in structure and shape only by forming a hollow internal passage.

Brief Description of Drawings

FIG. 1 is a cross-sectional view showing Embodiment 1 of a double-seat valve according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of Embodiment 1 of the double-seat valve according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2.

FIG. 4 is a sectional view taken along the line B_B in FIG. 2.

FIG. 5 is a sectional view showing Embodiment 2 of the double-seat valve according to the present invention.

FIGS. 6 (a) and (b) are enlarged cross-sectional views of essential parts of a double-seat valve according to Embodiment 2 of the present invention when the valve is closed and when the valve is opened.

FIG. 7 is a sectional view showing Embodiment 3 of the double-seat valve according to the present invention. FIGS. 8 (a) and (b) are enlarged cross-sectional views of essential parts of a double-seat valve according to Embodiment 3 of the present invention when the valve is closed and when the valve is opened.

〇

Garden 9] is a plan view of a lower valve shaft guide member used for the double-seat valve of the third embodiment.

Garden 10] is a sectional view showing Embodiment 4 of the double-seat valve according to the present invention.

Garden 11] is an enlarged sectional view of a main part of Embodiment 4 of the double-seat valve according to the present invention.

FIG. 12 is a bottom view of the valve element of the double-seat valve of the fourth embodiment.

Garden 13] A hot water supply cycle device using C〇 refrigerant to which the double-seat valve according to the present invention is applied

2

FIG. 14 is a block diagram showing a fifth embodiment which is one embodiment.

Explanation of symbols

Double seat valve

11 Valve housing

12 First entry / exit port

13 Second entry / exit port

20 Cylindrical member

21 1st valve port

22 Second valve port

25 end room

26 Intermediate room

28 Bearing hole

30 valve body

31 1st valve land

32 Second valve land

33 Valve stem

34 Internal passage

36 Male thread member

40 stepper motor

41 Rotor case 43 Female thread member

48 Stator assembly

100 Double seat valve

101 Valve housing

102 First entry / exit port

103 Second entry / exit port

104 Lower valve room

105 Upper valve room

108 1st valve port

109 2nd valve port

110 Valve shaft guide member

112 Lower stem guide member

120 Valve body

BEST MODE FOR CARRYING OUT THE INVENTION

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

Example 1

FIGS. 1 to 4 show a first embodiment of a double-seat valve according to the present invention.

[0017] The double seat valve according to the first embodiment is indicated by reference numeral 10 as a whole. The double seat valve 10 has a valve housing 11. The valve housing 11 includes a first inlet / outlet port (inlet port) 12 and a

A second inlet / outlet port (outlet port) 13 and a chamber 14 are formed.

[0018] The first inlet / outlet port 12 is formed as a lateral hole, and the first inlet / outlet port 12 has a lateral joint 1

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

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

[0020] The cylindrical member 20 fits into the upper and lower through holes 17A at the distal end 20A, and is directly connected to the lower joint 16. And extends vertically across the chamber 14 and fits into the upper and lower through-holes 17B at the intermediate portion 20B. The cylindrical member 20 has a hollow shaft shape, and a first valve port 21 is provided by a first valve seat 23 and a second valve port 22 is provided by a second valve seat 24 in the hollow portion. They are formed concentrically at predetermined intervals in the direction. The second valve port 22 has a slightly larger port diameter than the first valve port 21 (a size through which a first valve land portion 31 described later can pass) for assembling the valve body.

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

[0022] At a portion where the cylindrical member 20 crosses the chamber 14 up and down, a lateral hole 27 is formed to penetrate in the radial direction. The lateral hole 27 penetrates radially through an intermediate position in the axial direction between the first valve port 21 and the second valve port 22, and passes through the intermediate chamber 26, the chamber 14, and the horizontal joint 15 (the first inlet / outlet port 1). 2) is communicated.

[0023] Four cross holes 27 are formed in a cross at every rotation angle of 90 degrees. As a result, the positional relationship between the lateral hole 27 and the first inlet / outlet port 12 is substantially unaffected by the circumferential mounting position of the cylindrical member 20 with respect to the valve housing 11, and the cylindrical member 20 is circumferentially mounted with respect to the valve housing 11. There is no need to define the position (circumferential positioning). Therefore, the cylindrical member 20 can be assembled to the valve housing 11 at an arbitrary circumferential position.

[0024] The cylindrical member 20 has a first bearing hole 28 for supporting a valve shaft portion 33 of a valve body 30 to be described later in an axial direction (vertical direction) on an extension (upper side) of the end chamber 25 in the axial direction. , And are formed concentrically with the second valve ports 21 and 22. As a result, the cylindrical member 20 is formed as a single component and serves as both a valve seat member and a valve body support member.

[0025] 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 extends in the axial direction across the end chamber 25, the second valve port 22, and the intermediate chamber 26, and has a solid shaft shape (round bar shape) extending toward the end chamber 25 (upper side). The valve shaft 33 is integrally formed, and the valve shaft 33 is fitted into the bearing hole 28 of the cylindrical member 20 so as to be movable in the axial direction, thereby forming a circular shape. It is supported by the cylindrical member 20. By this fitting, the valve body 30 is supported via the cylindrical member 20 so as to be movable in the axial direction with respect to the valve housing 11.

[0026] The valve element 30 has a conical first valve land portion 31 that opens and closes the first valve port 21 by axial movement and a conical first valve land portion 31 that opens and closes the second valve port 22 by the same axial movement. And a second valve land portion 32.

[0027] The distal end (lower end) of the valve body 30 faces the lower joint 16, and a drilled hole 34A with a bottom is drilled from the distal end of the valve body 30 so that the valve body 30 is located in the end chamber 25. A lateral hole 34B is penetrated in the radial direction in the portion to be formed. Thus, 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 (the second inlet / outlet port 13). The four horizontal holes 34B are also formed in a cross at each rotation angle of 90 degrees.

An upper part 20C 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 butt-welded to the lower lid member 35 in an airtight manner. The rotor case 41 has a can shape having a cylindrical portion 41A and a hemispherical dome portion 41B integrally formed with the cylindrical portion 41A and closing the upper end of the cylindrical portion 41A. It is composed of a non-magnetic material.

[0029] A rotor 42 is rotatably arranged inside the cylindrical portion 41A of the rotor case 41.

The outer periphery of the rotor 42 is multipolar magnetized. A cylindrical female screw member 43 is fixed to the center of the rotor 42. The female screw member 43 and the rotor 42 are relatively rotatably connected to the upper end 33A of the valve body 30 by a connecting member 44, a fixing member 45, a collar member 46, a spring 47, and the like.

[0030] A male screw member 36 is concentrically fixed to the upper end 20D of the cylindrical member 20. The male screw member 36 has a hollow shaft shape, and the valve shaft 33 of the valve body 30 passes through the hollow 36A. A male screw 36B is formed on the outer peripheral surface of the male screw member 36, and the male screw 36B is screw-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 an outer peripheral portion of the rotor case 41 by a locking piece 49. The stator assembly 48 consists of an outer box 50, It has a stator coil 51, a plurality of magnetic pole teeth 52, an electrical connector portion 53, and the like, and is liquid-tightly sealed by a sealing resin.

[0032] A stopper holding rod 55 is suspended and fixed inside the hemispherical dome portion 41B. A spiral guide 56 is attached to the stopper holding rod 55, and a movable stopper 57 is engaged with the spiral guide 56.

[0033] The movable stopper 57 is vertically kicked by a pin 58 attached to the rotor 42, guided by a spiral guide 56 with the rotation of the rotor 42, and vertically moved while turning. The movable stopper 57 contacts 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, thereby rotating the rotor _{42 in} the valve closing direction or the valve opening direction. Restrict.

The stepping motor 40 rotationally drives the rotor 42 by energizing the stator coil 51. When the rotor 42 rotates, the rotational movement of the rotor 42 is converted into a linear movement 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 axial movement of the rotor 42 is transmitted to the valve body 30, and the valve body 30 moves in the axial direction (vertical direction).

As a result, the first valve land 31 of the valve element 30 adjusts the opening of the first valve port 21, and the second valve land 32 of the valve element 30 connects the second valve port 22 The opening degree is adjusted, and substantially the same flow control is performed in 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 → side hole 27 → intermediate chamber 26 → first valve port 21 → lower joint 16 (second inlet / outlet port) Outlet port 13) and horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → side hole 27 → intermediate chamber 26 → second valve port 22 → end chamber 25 → internal passage 34 → lower joint 16 A fluid such as a refrigerant flows through another flow path formed by the (second inlet / outlet port 13).

[0037] The flow path by the lateral 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) The flow path configuration is the same as the flow path of the single seat valve, and the horizontal joint 15 (first inlet / outlet port 12) → chamber 14 → side hole 27 → intermediate chamber 26 → second valve port 22 → end chamber 25 → inside The passage formed by the passage 34 → the lower joint 16 (the second inlet / outlet port 13) has a main portion 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, and the size of the valve housing 11 can be reduced. In addition, since the valve element 30 only needs to form the hollow internal passage 34, the structure and shape of the valve element 30 are not complicated.

[0038] Further, since the cylindrical member 20 is a single part, which also serves as a valve seat member and a valve body supporting member, the concentricity between the first and second valve ports 21 and 22 and the bearing hole 28 is high. And the number of parts is reduced.

Example 2

FIGS. 5, 6 (a) and 6 (b) show a second embodiment of a double-seat valve according to the present invention. In FIGS. 5 and 6, parts corresponding to FIGS. 1 to 4 are denoted by the same reference numerals as in FIG.

[0040] The double-seat valve according to the second embodiment is indicated by reference numeral 100 as a whole. The double seat valve 100 has a valve housing 101. The valve housing 101 includes a first inlet / outlet port (inlet port) 102, a second inlet / outlet port (outlet port) 103, a lower valve chamber (first valve chamber) 104, and an upper valve chamber ( A second valve chamber 105 is formed.

The first inlet / outlet port 102 is formed as a horizontal hole, and a transverse joint 106 is connected to the first inlet / outlet port 102. The second inlet / outlet port 103 is formed as a pilot hole, and a lower joint 107 is connected to the second inlet / outlet port 103.

[0042] The lower valve chamber 104 is shaped like a lateral hole, and directly communicates with the first inlet / outlet port 102. A first valve port 108 communicating with the second inlet / outlet port 103 is formed in a lower bottom surface portion of the lower valve chamber 104. A second valve port 109 communicating with the upper valve chamber 105 is formed on the upper surface of the lower valve chamber 104.

The first valve port 108 and the second valve port 109 are concentrically arranged on the same axis, are above and below the lower valve chamber 104, and face each other. Also in this embodiment, the second valve port 109 has a slightly larger port diameter than the first valve port 108 (a size through which a first valve land portion 31 described later can pass) because of the assembly of the valve element. ing.

A valve shaft guide member 110 also serving as an attachment for the male screw member 36 is fixed to the upper part of the valve housing 101 by caulking. The valve shaft guide member 110 supports the valve shaft portion 33 of the valve body 30 movably in the axial direction by a bearing hole 111 formed at the center. With this, the valve body 30 is supported movably in the axial direction with respect to the valve housing 101 via the valve shaft guide member 110.

[0045] The valve element 30 is equivalent to that of the first embodiment, and extends across the lower valve chamber 104, the second valve port 109, and the upper valve chamber 105 in the axial direction, and the valve The shaft 33 is integrally provided.

The valve element 30 has a cylindrical first valve land portion 31 that opens and closes the first valve port 108 by axial movement, and a conical shape that opens and closes the second valve port 109 by the same axial movement. And a second valve land portion 32.

[0047] Also in this embodiment, the distal end (lower end) of the valve body 30 faces the lower joint 107, and the valve body 30 is provided with a drilled hole 34A having a bottom from the distal end, and the valve body 30 is positioned on the upper side. A lateral hole 34B is radially penetrated through a portion located in the valve chamber 105. Thus, the drill hole 34A and the lateral hole 34B form an internal passage 34 that opens the upper valve chamber 105 to the lower joint 107 (second inlet / outlet port 103).

[0048] The configuration of the stepping motor 40, the feed screw and the like by the male screw member 36 and the female screw member 43 is the same as that of the first embodiment, so that the description of them to avoid redundant duplication will be omitted.

[0049] Also in this embodiment, the first valve land portion 31 of the valve element 30 is connected to the first valve port 108 by moving the valve element 30 in the axial direction (up and down) by driving the stepping motor 40. While adjusting the opening, the second valve land 32 of the valve body 30 adjusts the opening of the second valve port 109, and the first valve port 108 and the second valve port 109 Approximately equivalent flow control is performed.

[0050] Under this flow control, the horizontal joint 106 (first inlet / outlet port 102) → lower valve chamber 104 → first valve port 108 → lower joint 107 (second inlet / outlet port 103) Flow path and horizontal joint 10 6 (first inlet / outlet port 102) → lower valve chamber 104 → second valve port 109 → upper valve chamber 105 → internal passage 34 → lower joint 107 (second inlet / outlet port A fluid such as a refrigerant flows through another flow path according to 103).

[0051] The lateral joint 106 (first inlet / outlet port 102) → lower valve chamber: 104 → first valve port 108 → lower joint 107 (second inlet / outlet port 103) has a flow path of a single seat valve. It has the same flow path configuration as the flow path, and the horizontal joint 106 (first inlet / outlet port 102) → lower valve chamber: 104 → second valve port 109 → The upper valve chamber 105 → the internal passage 34 → the flow path formed by the lower joint 107 (second inlet / outlet port 103) has a main part constituted by the internal passage 34 of the valve body 30. The flow path configuration in the housing 101 is simplified, and the size of the valve housing 101 can be reduced. Also, since the valve element 30 only needs to form the hollow internal passage 34, the structure and shape of the valve element 30 do not become complicated.

[0052] A supercritical cycle using a carbon dioxide refrigerant or the like requires an ultra-high pressure and a large flow rate. However, in order to satisfy the condition that the amount of valve leakage is small, a double port structure of a double seat valve is used. The two valve port diameters are as identical as possible, and the ultra-high pressure acting on the valve body 30 can be canceled (pressure balance). The upper valve (second valve land 32) and the lower valve (first valve land) 31) must be seated correctly.

[0053] Further, even when the valves are open, it is required that the flow characteristics (valve lift-flow characteristics) at the two valve ports be the same and the pressure balance be maintained. For this reason, in the second embodiment, as is well shown in FIG. 6, the shapes (straight and tapered) of the first valve land portion 31 and the second valve land portion 32 of the valve body 30 and the first The shape (taper and straight) of each of the valve port 108 and the second valve port 109 is individually set to achieve the same flow characteristics at the two valve ports.

Example 3

FIGS. 7, 8 (a), (b), and FIG. 9 show a third embodiment of the double-seat valve according to the present invention. The figure

In FIG. 7 to FIG. 9, the portions corresponding to FIG. 1 and FIG. 5 are denoted by the same reference numerals as those in FIG.

In this embodiment, a cylindrical lower extension valve shaft portion 37 is formed at the lower end of the valve body 30. The lower extension valve shaft portion 37 passes through the center of the second inlet / outlet port 103 in the axial direction (upward and downward).

A lower valve shaft guide member 112 is fixed to the valve housing 101 together with the lower joint 107. The lower valve shaft guide member 112 supports the lower extension valve shaft portion 37 of the valve body 30 movably in the axial direction by a bearing hole 113 formed at the center.

As a result, the valve element 30 moves the upper side, that is, the feed screw mechanism side of the male screw member 36 and the female screw member 43 in the axial direction with respect to the valve housing 101 via the valve shaft guide member 110. In addition to being movably supported, the lower valve shaft guide is provided on the lower side, that is, on the opposite side of the feed screw mechanism across the first valve land 31 and the second valve land 32. It is movably supported in the axial direction with respect to the valve housing 101 via a member 112.

[0058] As a result, the valve element 30 has a two-point support structure, and when the valve is opened, the valve element 30 is prevented from swaying and vibrating due to the fluid flowing in the valve housing 101, and the flow rate control is stabilized. Also, the fluid passing noise is reduced.

[0059] The lower valve shaft guide member 112 has a plurality of through holes (through holes) 114 formed around the bearing hole 113 so as not to obstruct the flow of fluid in the lower joint 107.

Example 4

FIGS. 10, 11, and 12 show a fourth embodiment of the double-seat valve according to the present invention. In FIGS. 10 and 12, parts corresponding to FIGS. 1 and 5 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

[0061] In this embodiment, the first valve land portion 31 is configured as a separate component from the valve main body 120 integrally having the second valve land portion 32 and the valve shaft portion 33. Thus, the valve body 30 is composed of the valve body 120 and the first valve land portion 31.

[0062] The first valve land portion 31 is a cylindrical component, and has an internal thread 31A formed in the inner peripheral portion.

A male screw 120A is formed on the outer periphery of the valve land mounting portion of the valve body 120. The female screw 31A of the first valve land 31 is screwed into the male screw 120A.

With this screw engagement, the axial mounting position of the first valve land portion 31 with respect to the valve body 120 can be finely adjusted. This fine adjustment is performed with respect to the first valve land 108A around the valve seat 108A around the first valve port 108 and the valve seat 109A around the second valve port 109 where the axial separation distance is fixed. The distance is set so that both the first and second valve lands 32 are simultaneously seated (the distance between the first and second valve lands 31 and 32 in the axial direction).

After the fine adjustment, the lower end portion 120B of the valve body 120 is swaged into the swaging engagement recess 31B formed in the first valve land portion 31, so that the first valve land portion 31 is brought into contact with the valve body 120. It is stopped and fixed. In this embodiment, four squeezing engagement recesses 31B are provided at 90 ° intervals, but it is sufficient if at least one squeezing engagement recess 31B is provided. The shape of 31B is not limited to a semicircle, but may be a triangle or a rectangle. As described above, the first valve land portion 31 is configured as a separate component from the valve body 120 having the second valve land portion 32 integrally, and the valve body 120 of the first valve land portion 31 is formed. By adjusting the mounting position with respect to, even if there is a manufacturing error in the axial separation between the valve seat 108A and the valve seat 109A, both the first valve land 31 and the second valve land 32 The fully closed state in which the seat is seated can be reliably obtained, and the amount of valve leakage can be eliminated or reduced.

[0066] Since the first valve land portion 31 is configured as a separate component from the valve body 120 having the second valve land portion 32 integrally, the first valve land portion 31 can be assembled easily. However, a design that is larger than or equal to the valve seat member 109A around the second valve port 109 is also possible.

Example 5

FIG. 13 is an embodiment of a hot water supply cycle apparatus using a CO refrigerant (carbon dioxide refrigerant) in which the double-seat valve 10 or 100 of the first or second, third, or fourth embodiment is used. 5 is shown.

This hot water supply cycle device is a heat pump type water heater, and has a CO refrigerant circulation circuit including a compressor 71, a gas cooler 72 corresponding to a condenser, an electric double-seat valve 10 or 100, and an evaporator 73. Then, heat exchange is performed between the high-temperature CO refrigerant passing through the gas cooler 72 and the cold water in the hot water tank 74 to produce hot water.

Industrial applicability

As is apparent from the first to fourth embodiments described above, the double-seat valve of the present invention has the same flow path configuration as the single-seat valve and the flow through the internal passage of the valve element. The two-way flow path required for the double-seat valve is configured by the path configuration, so the flow path configuration in the valve housing as a double-seat valve is simplified, the valve housing can be downsized, and the valve Only the formation of the hollow internal passage does not complicate the structure and shape.

[0070] The valve body has a valve stem extending toward the end chamber, and the cylindrical member moves the valve stem in the axial direction on an axial extension of the end chamber. It is possible to provide a structure that has a bearing hole for supporting as much as possible, and also serves as a valve seat member and a valve body support member. Thereby, the number of parts is reduced, and concentricity between the valve port and the bearing hole is also guaranteed.

Further, in the double seat valve according to the present invention, the electric motor such as a stepping motor and the electric motor A feed screw mechanism that is driven to rotate by a motor and converts the rotational motion of the electric motor into a linear motion; the feed screw mechanism and the valve body are drivingly connected; and the valve body is driven by the feed screw mechanism. It can be configured to be driven in the axial direction. As a result, an electric double seat valve is obtained.

[0072] In the double-seat valve according to the present invention, the valve body is separated from the feed screw mechanism and the feed screw mechanism by the first valve land and the second valve land. On each of the opposite sides, a force S can be applied to a structure that is supported movably in the axial direction from the valve housing. Thereby, the swing movement (vibration) of the valve element is enhanced.

[0073] Further, in the double-seat valve according to the present invention, the first valve land portion is configured as a separate component from the valve body integrally having the second valve land portion. The land portion may be fixedly mounted on the valve main body, and preferably, the first valve land portion is threadedly engaged with the valve main body so that an axial mounting position can be adjusted. In this state, it is possible to obtain a structure fixed to the valve body by caulking.

[0074] If the first valve land is configured as a separate component from the valve body integrally having the second valve land, the mounting position of the first valve land with respect to the valve body is reduced. The adjustment ensures a fully closed state in which both the first valve land and the second valve land are seated together, and reduces or eliminates valve leakage.

Claims

The scope of the claims

[1] 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 disposed in the hollow portion of the cylindrical member so as to be movable in the axial direction,

A first valve port and a second valve port are formed concentrically on the same axis at predetermined intervals 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. Defining, on the other side of said first valve port, communicating with said second inlet / outlet port;

The cylindrical member has a lateral hole penetrating radially through an intermediate position in the axial direction between the first valve port and the second valve port to communicate the intermediate chamber with the first inlet / outlet port. Has been established,

A first valve land extending axially across the end chamber, the second valve port, and the intermediate chamber, and opening and closing the first valve port by axial movement; A second valve land that opens and closes the second valve port, and an internal passage that opens the end chamber to the second inlet / outlet port.

A double-seat valve characterized by the following:

[2] The valve body has a valve stem extending toward the end chamber, and the cylindrical member is capable of moving the valve stem in the axial direction on an axial extension of the end chamber. 2. The double-seat valve according to claim 1, wherein the double-seat valve has a bearing hole for supporting the valve and serves as a valve seat member and a valve body support member.

[3] a valve housing having a first inlet / outlet port and a second inlet / outlet port;

A rod-shaped valve body arranged to be movable in the axial direction with respect to the valve housing,

The valve housing includes a first valve chamber directly communicating with the first inlet / outlet port, a second valve chamber, and the second inlet / outlet port formed on one side of the first valve chamber. A first valve port communicating with the first valve chamber; and a first valve port formed on the other side of the first valve chamber. A second valve port disposed on the same axis and communicating with the second valve chamber, wherein the valve element traverses the first valve chamber and the second valve chamber in the axial direction. A first valve land that extends and opens and closes the first valve port by axial movement, a second valve land that opens and closes the second valve port, and the second valve chamber. And an internal passage opening to the second inlet / outlet port.

A double-seat valve characterized by the following:

[4] An electric motor, and a feed screw mechanism that is rotationally driven by the electric motor and converts the rotational movement of the electric motor into linear motion, wherein the feed screw mechanism and the valve element are drivingly connected. 4. The double-seat valve according to claim 4, wherein the valve body is driven in the axial direction by the feed screw mechanism.

[5] The valve body is provided on the valve housing at each of the feed screw mechanism side and the opposite side of the feed screw mechanism opposite the first valve land portion and the second valve land portion. 5. The electronic device according to claim 1, wherein the supporting member is supported so as to be movable in an axial direction.

Double seat valve according to item 1.

[6] The first valve land is configured as a separate component from a valve body integrally having the second valve land, and the first valve land is fixedly attached to the valve body. The double-seat valve according to any one of claims 1 to 5, wherein

7. The valve body according to claim 6, wherein the first valve land portion is fixed to the valve main body by caulking in a state where the mounting position in the axial direction of the first valve land portion is adjusted so as to be adjustable. Double seat valve as described.