JP2001330165A - Manual valve opening device in fluid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release valve locking by an operation from a valve exterior when a valve is locked in a fluid control valve. SOLUTION: This manual valve opening device 50 is attached to a bottom part of valve body 28. By rotating and forcing in a manual opening screw 51 screwed into a cylindrical main body part 28A of the manual valve opening device from the exterior, a valve 38 is forcibly moved in a direction separating from a valve seat 28a for unlocking a valve locked state by an operation from the exterior. Leakage of refrigerant to the exterior is prevented by the function of a sealing part 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual valve opening device in a fluid control valve for manually opening a valve when a power failure occurs or a valve is locked due to an inconvenience of a valve operating mechanism.

[0002]

2. Description of the Related Art Generally, a refrigeration cycle 100 includes a compressor 101, a condenser 103,
The compressor 101 includes an expansion valve 104, an evaporator 105, and an accumulator 106. A suction pressure adjusting valve (hereinafter, referred to as “fluid control valve”) 102 is provided on a suction side of the compressor 101.

As such a fluid control valve 102, a stepping motor type as shown in FIG. 10 is conventionally known. That is, this fluid control valve is
8 and a stepping motor M integrally fixed to an upper portion of the valve main body 28 and constituting (part of) a valve driving section.

In FIG. 10, a valve chamber 28B having a pair of upper and lower valve seats 28a and 28b is provided inside a valve body 28. A lid 25 as a base of a valve drive unit is attached to an upper portion of the valve body 28, and a stepping motor M is supported on the lid 25.

[0005] A pair of upper and lower valve seats 28a, 2
8b, and a valve 38 having a pair of valve portions 38a, 38b which can be attached to and detached from the respective valve seats 28a, 28b.
Is provided. The stem 37 is
The valve 38 is inserted into the hollow central shaft of the valve 38 and is pushed down by the downward movement of the needle 20 of the valve driving section, which will be described later. The upward movement of the valve 38 is performed by the valve spring 26. Further, a fluid inflow joint 29a and a fluid outflow joint 29b are connected to the left and right ends of the valve body 28, respectively. The fluid flows in the valve body 28 from right to left in FIG. It branches and joins on the secondary side.

Reference numeral 5 denotes a pair of upper and lower coils, and 15 denotes a magnet. The coil (fixed side member) 5, magnet (rotary side member) 15, case 14 and case 1
A stepping motor M having a normal structure is formed by a rotation stopping mechanism including a mandrel 10, a guide 7, a slider 9, and a spring pin 8 fixed to 4. The coil 5 is covered with the mold 3. The lower lid receiver 24 is fixed to the lid 25, and the male screw tube 13 is further attached to the lower lid receiver 24.
Is fixed upright. The lower cover 23 is provided around the male screw tube 19, and the lower cover 2 is provided.
A case 14 is fixed on 3.

On the outer periphery of the case 14, a stator 4 having a built-in coil 5 and having a large number of teeth arranged at equal intervals in the circumferential direction.
Are provided detachably. Inside the case 14, a female screw 18 forming a rotor is provided so as to be screwed with a male screw of a male screw tube 19. Reference numeral 32 indicates a gasket.

The rotor of the stepping motor M integrates the magnet 15 and the spacer 16 attached inside the magnet 15, and screws the female screw 18 fitted and fixed below the spacer 16 inside the male screw tube 13. And is provided so as to be rotatable and movable in the axial direction. Magnet 15
, N poles and S poles are alternately magnetized in the circumferential direction.

A plate 17 is provided at an intermediate portion in the axial direction of the spacer 16, and the upper end of the needle 20 is welded to the small hole thereof together with the stopper 11. A spring 13 and a washer 12 are provided between the step portion of the needle 20 and the plate 17 at the small diameter portion at the upper end of the needle 20. Reference numeral 21 indicates a wave washer, and reference numeral 22 indicates a retaining ring.
The needle 20 is connected to the stem 37 via the needle receiver 35.
When the stepping motor M rotates, the needle 20 moves up and down while rotating, and in conjunction with this, the stem 37 also moves up and down while rotating.

The valve spring 26 is located between the valve 38 and the adjustment fitting 27.
Is provided. The stepping motor M is airtightly fixed to the lid 25 by a hexagon socket head cap screw 30 and a gasket 31. Reference numerals 33 and 34 indicate lids, respectively. Reference numeral 35 denotes a needle receiver, 39 denotes a gasket, and 40 denotes a bottom cover. Reference numeral 6 in the figure indicates a connector.

In addition, an electromagnetic type fluid control valve as shown in FIG. 11 is known. In this fluid control valve, in the fully open state shown in FIG. 11, a suction force that pushes down the plunger 04 is generated by a magnetic force corresponding to the voltage applied to the electromagnetic coil 08, and the voltage gradually increases to a specified current. In this case, the prescribed valve opening is obtained in proportion to the reaction force of the valve springs 26a and 26b. When the current further increases, the magnetic force overcomes the reaction force of the valve springs 26a and 26b, and the stem 37 is pushed and fully closed. In addition, a valve structure, a pipe joint, and the like made of the same members denoted by the same reference numerals as those of the fluid control valve in FIG.

[0012]

In the above-mentioned conventional apparatus, if the valve 38 stops at the valve closed position and does not move for some reason, the suction pressure of the compressor 101 decreases. The compressor starts and stops frequently and causes a failure. Alternatively, there is a possibility that the amount of circulating refrigerant decreases, the required refrigeration capacity cannot be obtained, and the temperature inside the refrigerator / refrigerator cannot be maintained. To release this state, there is no other means than disassembly of the fluid control valve, which not only requires a great deal of trouble and cost, but also causes the refrigerant in the refrigeration cycle to leak to the outside. There are inconveniences such as causing pollution.

The present invention addresses such inconveniences, and when the fluid control valve stops operating at the valve closed position and does not operate, the valve is manually forcibly opened. A manual valve opening device for returning the pressure to the fluid control valve is incorporated in the fluid control valve, and a seal mechanism for preventing leakage of refrigerant from inside the valve (inside the refrigeration cycle) at the time of valve opening operation by the manual valve opening device is provided by the manual operation. A fluid control valve mounted on a valve opening device is provided.

[0014]

SUMMARY OF THE INVENTION According to the present invention, there are provided a valve body having a valve body provided therein with connection portions for a fluid inflow pipe and a fluid inflow pipe at both ends, and a valve seat provided in the valve chamber. A valve body for controlling the flow rate of the fluid by contacting the valve body from above and a stem thereof, and a valve drive unit mounted above the valve body, wherein a lower portion of the valve body is provided. The problem is solved by attaching a manual valve opening device.

The manual valve opening device is formed to project downward from the valve main body, and has a cylindrical main body having a through hole formed in the center thereof and communicating with the valve chamber. A manual opening screw having a center hole into which a small diameter portion at the lower end of the stem can be inserted, a seal portion interposed between the manual opening screw and the main body portion, and the through portion is hermetically sealed. And a bottom cover to be used as means for solving the second problem.

Further, the seal portion may be formed of an O-ring, or may surround the lower end small diameter portion of the stem inserted into the center hole portion in the center hole portion of the manual opening screw. A seal packing, which is disposed so that the back part is in contact with the main body, and a plurality of disc springs and a plurality of disc springs which are disposed inside the seal packing and press the seal packing downward and toward the main body. It is constituted by a leaf spring in a shape of a circle, and is a means for solving the third problem.

The manual valve opening device may further include a cylindrical main body protruding below the valve main body and having a through hole in the center portion communicating with the valve chamber. A packing receiver having a center through hole communicating with the valve chamber and having a substantially concave cross section, a spindle screwed into a male screw screwed into a female screw formed on the inner periphery of the center through hole of the packing receiver, A vertical groove formed in a center portion of the spindle for fitting and supporting a lower small-diameter end of the stem; a spring retainer screwed and attached to a female screw formed in the through hole below the packing receiver; A Teflon packing fitted into the outer periphery of the lower narrow end of the spindle, and a lower end surface of the lower narrow end of the spindle extending downward through the bottom surface of the packing receiver; Engagement switch And grouts, and the Teflon packing is constituted by a disc spring provided in the spring retainer to press against the receiving the packing, and the fourth problem solving means.

According to the present invention, when the valve is locked and becomes inoperable in the closed state, the bottom cover is removed, and then a tool such as a flathead screwdriver is attached to the three-dimensional screw formed on the plug-shaped manual screw. To rotate the manual set screw to push the manual set screw upwards, thereby lifting the stem or valve upwards to "valve open" the valve.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. The embodiment shown in FIG.
The fluid control valve of the present embodiment also includes a stepping motor M and a stepping motor M.
A stem 37 driven vertically by the rotation of the
7, a valve 3 having a set of valve portions 38a, 38b
It is provided with a valve body 28 having a built-in 8 and the like, and is configured in substantially the same manner as the conventional one. However, in this embodiment, a round rod-shaped rotary shaft 20A is used instead of the needle 20 in the fluid control valve shown in FIG. 10, and a ball 20B is interposed between the rotary shaft 20A and the stem 37. . Accordingly, although the needle receiver 35 (FIG. 10) is also omitted, there is no difference in other configurations.
10, the same members as those in FIG. 10 are denoted by the same reference numerals, and a detailed description thereof will be omitted.

The fluid control valve of this embodiment also has a valve body 2
8 at the left and right end openings, respectively, a fluid inflow joint 29a,
The outflow joint 29b is connected, and the fluid flows through the valve body 28 in FIG.
Flows from right to left at, branches up and down at the valve seats 28a and 28b, and merges at the secondary side.
A manual valve opening device 50 is provided below the valve body 28.

The manual valve opening device 50 is, as shown in FIG.
A lower end of the valve main body 28 has a cylindrical main body 28A protrudingly formed, and a through hole 28c communicating with the valve chamber 28B is formed at the center of the main body 28A. Main unit 28A
A male screw 28e is formed on the outer peripheral surface of the male screw 28e.
The bottom opening 40f of the through hole 28c at the center of the main body 28A is hermetically closed by the bottom cover 40 having the female screw 40a to be screwed with e and the gasket 39. Valve body 2
A female screw 28g is formed in the large-diameter portion at the lower end of the through hole 28c of FIG. It is screwed into the hole 28c. On the bottom of the manual opening screw 51, a tool for opening the valve (flat screwdriver)
Are formed.

The lower narrow end 37A of the stem 37 is extended to the inside of a large-diameter vertical groove-shaped center hole 51a formed at the center of a manual opening screw 51 forming the manual valve opening 50. I have. Further, a seal portion 52 is provided between the manual set screw 51 and the main body 28A. The seal portion 52 is an extension (small diameter) 37A of the stem 37 inserted into the central hole 51A in the large-diameter central hole 51a of the manual screw 51.
Packing (Teflon packing) 53, four disc springs 54, a plurality of plates bent in a "K" shape, surrounding the entire periphery of the upper end of the manual set screw 51. It is composed of a spring 55 and a spacer 56.

Seal packing (Teflon packing)
A plurality of disc springs 54 and a U-shaped leaf spring 53 are installed so that the back surface thereof abuts the main body 28A and the bottom surface abuts the upper surface of the stepped portion of the manual set screw 51.
Numeral 5 is disposed inside the seal packing 53 so as to press the seal packing 53 downward and toward the main body 28A. The above Teflon packing 5
The three or four disc springs 54 and the plurality of leaf springs 55 bent in a “K” shape can be held in the state shown in FIG. 3 by caulking the upper edge of the manual set screw 51. .

As shown in FIGS. 1 and 2, the small diameter portion 37A of the lower end of the stem 37 is inserted through the insertion hole of the spacer 56 inserted into the center hole 51a of the manual screw 51. . The valve spring 26 is interposed between the spacer 56 and the step 37a of the stem 37. The lower end of the small diameter portion 37A of the lower end of the stem 37 and the central hole 5 of the manual set screw 51
It is configured such that a slight gap is usually formed between the bottom surface of 1a. 1 and 2, reference numeral 57 denotes an O-ring. At the time of the valve opening operation by the manual valve opening section,
An O-ring 60 is interposed between the manual screw 51 and the main body 28A in order to prevent the refrigerant from leaking from the inside of the valve. Thus, it is possible to prevent the refrigerant from leaking from the inside of the valve at the time of the valve opening operation by the manual valve opening section.

Next, a procedure for manually opening the valve by operating the manual valve opening device 50 when the valve is locked and becomes inoperable in the closed state will be described.

1 and 2, after the bottom cover 40 is removed, a tool such as a flathead screwdriver is engaged with a screwdriver 51B formed on the plug-shaped manual screw 51 to rotate the manual screw 51. . By this rotation, the manual screw 51 is pushed upward, and by pushing the manual screw 51 upward, the stem 37 is also lifted upward, and the valve is opened. When this rotation is further continued, the manual screw 5
The one step portion 51b abuts on the step portion 28h of the main body 28A, so that it cannot rotate any more. FIG. 4 shows this state.

During the valve opening stroke, the following sealing action is performed. That is, the sum of the "force of the disc spring 54" and the "force of the fluid acting from above" acts on the seal packing 53, and the gap between the bottom surface of the seal packing 53 and the upper surface of the stepped portion of the manual screw 51 is formed. The function of preventing leakage of the fluid from the upper part to the lower part (leakage indicated by reference character Y in FIG. 5) is performed. In addition, the leaf spring 55 generates an outward force by the force of the disc spring 54, and the “fluid force acting from above” is added to the outward force, so that the upper and lower portions between the side surface of the seal packing 53 and the main body 28A are lower. The operation of preventing leakage of fluid to the air (leakage indicated by symbols X and Y in FIG. 5) is performed. These sealing effects contribute to the prevention of leakage by the "force of the fluid acting from above". Since a so-called "self-sealing" effect is performed, the higher the fluid pressure, the more difficult the leakage.

When the pressure of the fluid suddenly rises for some reason inside the valve (inside of the sealing portion such as the disc spring 54), the sealing function using the O-ring or the like is insufficient and the fluid leaks out of the sealing portion. Therefore, the liquid may accumulate in the lower portion of the manual valve opening mechanism 40 (in a liquid-sealed state). In such a state, even when the temperature outside the valve becomes high and the pressure of the liquid sealing fluid rises, in this embodiment, the side surface of the seal packing 53 and the body portion are formed by the disc spring 30 and the plate spring 55. An action of preventing fluid leakage from the lower portion to the upper portion between the upper portion and the lower portion (28A) (the leak from the lower portion to the upper portion in the vertical direction indicated by reference numeral X in FIG. 5) is performed. in this case,
Since no "self-sealing" action is performed, the higher the pressure, the more likely it is to leak.

The above-described embodiment is directed to an apparatus provided with a stepping motor as a valve drive source shown in FIG. Therefore, it is needless to say that the effect described above is an effect of the fluid control valve of this type. However, the other conventional example having an electromagnetic coil for attracting a plunger as a valve driving source shown in FIG. Applying the technique of the above, during the release of the valve lock by operating the manual valve opening device and during the release process, the sum of the "force of the disc spring 54" and the "force of the fluid acting from above" is sealed. By acting on the packing 53, it is possible to prevent fluid leakage from the upper portion to the lower portion between the bottom surface of the seal packing 53 and the upper surface of the stepped portion of the manual opening screw 51, and the leaf spring 55 Generates a force on the outside, which is called "fluid force acting from above"
Is added to the side of the seal packing 53 and the body 2
Needless to say, an effect of preventing the fluid from leaking from the upper portion to the lower portion between the upper portion and the lower portion is obtained.

Next, a second embodiment will be described with reference to FIGS. In the second embodiment as well, a cylindrical main body 28A is formed to project from the lower end of the valve main body 28, and a through hole 28c communicating with the valve chamber 28B is formed at the center of the main body 28A. I have. A packing receiver 110 having a center through hole communicating with the valve chamber 28B at the center and having a substantially concave cross section is attached to the through hole 28c. Male screw 11 screwed into the formed female screw 110a
A spindle 115 having an outer periphery 5a is screw-fitted. A vertical groove is formed in the center of the spindle 115, and the lower small-diameter end 37A of the stem 37 is fitted and supported in the vertical groove. The lower end of the spindle 115 is formed on a shaft portion 115A that is thinner than the upper portion. The shaft portion 115A extends downward through the bottom surface of the packing receiver 110, and has a valve opening tool (minus screwdriver) on the lower end surface. Are formed. Reference numeral 111 indicates a lower packing inserted between the packing receiver 110 and the valve body 28.

A spring retainer 114 is screwed and attached to the female screw 28j formed in the through hole 28c below the packing receiver 110. Reference numeral 112 denotes a Teflon packing fitted on the outer periphery of the shaft portion 115A. The Teflon packing 112 has an upper end formed in a mountain shape, and an inclined surface of the mountain shape portion is formed on a bottom surface of the packing receiver 110. The spindle 11 is pressed into contact with the inclined surface of the formed recess.
5, which performs a sealing action between the shaft portion 115A and the packing receiver 110, and is pressed upward by the spring force of a disc spring 113 interposed between the spring retainer 114 and the Teflon packing 112. The slope of the chevron is the packing receiver 1
By being pressed against the inclined surface of the recessed portion 10, the upper portion 10 is deformed upward and laterally to perform the above-described sealing action. A stopper for restricting the upward movement of the spindle 115 to the shaft 115A of the spindle 115
118 is attached.

As shown in FIG. 8, a turning groove 114a for screwing the spring holding 114 into the main body 28A is formed on the lower surface of the spring holding 114.
By engaging a tool with a and pressing down the spring retainer 114, a pressure is applied to the lower packing 111, and a sealing function of this portion is generated.

The operation of the manual valve opening device of the second embodiment is substantially the same as the operation of the manual valve opening device of the first embodiment. That is, first, the bottom cover 40 is detached from the main body 28A, and a valve-opening tool (a flathead screwdriver) is engaged with the sleeve 51B to rotate the spindle 115. The spindle 115 is pushed up as it rotates, and the spindle 1
By pushing up 15, the stem 37 is pushed up and the valve is opened.
Leads to. FIG. 7 shows the state at this time. The upward movement of the spindle 115 can be stopped by the stopper-118 contacting the lower surface of the spring retainer 114. When the valve is opened, it is needless to say that leakage of the refrigerant from the valve chamber 28B can be prevented by the sealing action of the Teflon packing 112.

As described above, in the device of the second embodiment, the release of the valve lock state can be performed by removing the bottom cover 40 of the fluid control valve and operating it from outside the fluid control valve. The valve lock state can be released without disassembling the valve, which is extremely advantageous from the viewpoint of maintenance. When the manual valve opening device is operated, leakage of refrigerant from the valve chamber 28B can be prevented by the sealing action of the lower packing 111 and the sealing action of the Teflon packing 112. Note that the second embodiment is directed to an apparatus provided with a stepping motor as a valve drive source shown in FIG. Therefore, it is needless to say that the effect described above is an effect of the fluid control valve of this type. However, the other conventional example having an electromagnetic coil for attracting a plunger as a valve driving source shown in FIG. It goes without saying that the same effect can be obtained even if the above technique is applied.

[0035]

As described in detail above, according to the present invention,
The following effects can be obtained. (1) A manual valve opening device is attached to the lower portion of the valve body, and a manual opening screw screwed into a cylindrical main body of the manual valve opening device is rotated from the outside and pushed into the valve, thereby opening the valve. The valve lock state can be released by forcibly moving the valve away from the seat. (2) Since the above operation is an operation from the outside of the fluid control valve by removing the bottom cover of the fluid control valve, the valve lock state can be released without disassembling the fluid control valve. Very advantageous from the top. (3) During the release process of the valve lock by operating the manual valve opening device, the leakage of the refrigerant from the inside of the valve to the outside can be prevented by the action of the seal portion. (4) The sealing action of (3) is a so-called “self-sealing” in which “the force of the fluid acting from above” has contributed to preventing leakage. Therefore, the manual valve opening mechanism increases as the fluid pressure increases. The leakage of the part can be suppressed. (5) When operating the manual valve opening device, leakage of refrigerant from the valve chamber can be prevented by the sealing action of the lower packing and the sealing action of the Teflon packing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fluid control valve including a manual valve opening device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a manual valve opening device in the fluid control valve of FIG. 1;

FIG. 3 is an enlarged view of an arrow A portion (seal portion) in FIG. 2;

FIG. 4 is a cross-sectional view of the fluid control valve of FIG. 1 when the valve is manually opened.

FIG. 5 is a schematic diagram for explaining the operation of the seal section shown in FIG. 3;

FIG. 6 is a sectional view of a manual valve opening device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of the fluid control valve of FIG. 6 when the valve is manually opened.

8 is a perspective view of a spring retainer of the manual valve opening device shown in FIG. 6;

FIG. 9 is a schematic circuit diagram of a refrigeration cycle.

FIG. 10 is a sectional view of a conventional fluid control valve.

FIG. 11 is a sectional view of another conventional fluid control valve.

[Explanation of symbols]

 Reference Signs List 1 stay 2 cap 4 stator 5 coil 7 guide 14 case 15 magnet 18 female screw 19 male screw 20 needle 20A rotation shaft 20B ball 23 lower lid 24 lower lid receiver 25 lid 26 valve spring 27 adjusting fitting 28 valve body 29a fluid inflow joint 29b fluid Outflow joint 37 Stem 37A Stem lower end thin portion 39 Gasket 40 Bottom lid 50 Manual valve opening device 51 Manual opening screw 52 Seal portion 54 Disc spring 55 Plate spring 56 Spacer 57 O ring 60 O ring 110 Packing receiver 111 Lower packing 112 Teflon Packing 113 Belleville spring 114 Spring retainer 115 Spindle 115A Spindle lower end small diameter portion M Stepping motor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H062 AA02 AA15 BB05 BB28 BB33 CC02 CC19 DD01 EE06 FF40 HH04 3H063 AA01 BB12 BB39 BB47 BB50 DA01 EE20 GG08 GG14 3H066 AA01 BA38 DA02 DA15

Claims (5)

[Claims] 1. A valve body having a valve body provided therein with a connection portion to each of an inflow pipe and an outflow pipe of a fluid at both ends, and a valve seat in the valve chamber and a valve seat in the valve seat. A valve body for controlling the flow rate of the fluid by contacting the valve body and its stem is disposed, and in a fluid control valve in which a valve driving unit is mounted above the valve body, a manual valve opening device is provided at a lower portion of the valve body. A manual valve opening device for a fluid control valve, which is attached. 2. The valve opening device according to claim 1, wherein the manual valve opening device is formed so as to protrude below the valve body and has a through hole in the center portion communicating with the valve chamber. A manual screw having a central hole into which a lower end small diameter portion of the stem can be inserted, a seal portion provided between the manual screw and the main body, and a lower opening of the through hole. The manual valve-opening device in the fluid control valve according to claim 1, comprising a bottom lid that hermetically seals the valve. 3. The manual valve opening device for a fluid control valve according to claim 2, wherein the seal portion is formed of an O-ring. 4. The seal portion is disposed in the center hole of the manual set screw so as to surround a lower end small-diameter portion of the stem inserted into the center hole, and has a back surface portion as a main body. A seal packing provided so as to abut on the seal packing, and a plurality of disc springs and a U-shaped leaf spring disposed inside the seal packing and pressing the seal packing downward and toward the main body. The manual valve opening device for the fluid control valve according to claim 2, which is configured. 5. The valve opening device according to claim 1, wherein the manual valve opening device has a cylindrical main body protruding below the valve main body and having a through hole in the center portion communicating with the valve chamber. A packing receiver having a center through hole communicating with the valve chamber and having a substantially concave cross section, a spindle screwed into a male screw screwed into a female screw formed on the inner periphery of the center through hole of the packing receiver, A vertical groove formed in a center portion of the spindle for fitting and supporting a lower small-diameter end of the stem; a spring retainer screwed and attached to a female screw formed in the through hole below the packing receiver; A Teflon (registered trademark) packing fitted around the outer periphery of the lower small diameter end of the spindle, and formed on the lower end surface of the lower small diameter end of the spindle extending downward through the bottom surface of the packing receiver. Valve tool staff The manual valve-opening device for a fluid control valve according to claim 1, further comprising a joint sleeve and a disc spring provided on the spring retainer for pressing the Teflon packing against the packing receiver.