JPH0336760Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a shut-off valve device, more specifically, a shut-off valve device, for example, which is installed in the middle of a refrigerant flow path connecting an indoor unit and an outdoor unit in a separate air conditioner. This invention relates to a closing valve device used to temporarily cut off the flow of water.

(Prior Art) Generally, this type of shut-off valve device has a flow path B formed in a valve box A, as shown in FIG.
A valve hole C is provided with a lower end opening in the middle of the flow path B and an upper end opening outside the valve box A, and a female thread D is formed on the inner peripheral surface of the lower part of the valve hole C. A male thread F is formed on the outer circumferential surface of the valve body E disposed in C, and the male thread F is screwed into or loosened from the female thread D, and the valve body E is screwed into the female thread D. It is provided in the valve hole C so that it can freely move forward and backward with respect to the flow path B, and the flow path B is opened and closed by the valve body E.

Further, an annular fitting groove G is formed on the inner peripheral surface of the upper end opening of the valve hole C, and a C-shaped retaining ring H is fitted into the fitting groove G, so that when the valve body E is loosened, The retaining ring H prevents the valve body E from being screwed further down than a set position.

(Problems to be Solved by the Invention) Such a shutoff valve device, for example, fixes the refrigerant pipe on the outdoor unit side to the opening at one end of the flow path B by welding or the like, and connects the refrigerant pipe to the outdoor unit using the shutoff valve device. To prevent the filled refrigerant from leaking, when installing the air conditioner, connect the refrigerant pipe on the indoor unit side to the other end opening of the flow path B, and then open the valve body E with a tool such as a wrench. Unscrew it,
The flow path B is opened, but during the above-mentioned opening operation of the flow path B, the valve body E may be unscrewed with more torque than necessary, and the valve body E may climb over the retaining ring H. The refrigerant gas in the flow path B may blow out to the outside through the valve hole C and adhere to the hands of the worker, resulting in frostbite or, in some cases, the pressure of the refrigerant gas may damage the valve body. E is the valve hole C
There is also a possibility that the device may jump out of the way.

The present invention was developed in view of the above-mentioned circumstances, and the purpose is to prevent the valve body from being in the set position even if the valve body is unscrewed with more torque than necessary during the opening operation of the flow path. The object of the present invention is to provide a closing valve device that does not move in the screwing direction.

(Means for solving the problem) However, the present invention provides a valve box 1 having a flow path 2.
A valve hole 3 whose one end communicates with the flow path 2 is provided, and a valve body 4 is screwed into the valve hole 3 via a threaded portion S so that the valve body 4 can freely move forward and backward, and the flow path 2, the opening side end of the valve hole 3 is bent inward to open and close the valve body 4.
A locking portion 5 is formed to lock the valve body 4 from being removed from the valve hole 3, and the valve body 4 is engaged with the locking portion 5 while the valve body 4 is screwed into the valve hole 3. At the same time, when the valve body 4 is locked by the locking part 5, the locking part 5 is deformed outwardly and the valve body 4 is detached from the valve hole 3 under a load. The threaded portion S
It is characterized by having a reduced breaking strength.

(Function) According to the present invention, although the valve body 4 is unscrewed with more torque than necessary when opening the flow path 2, after the valve body 4 abuts the locking portion 5, the Since the threaded portion S is destroyed, the valve body 4 does not move any further in the unscrewing direction.

(Example) The shutoff valve device according to the present invention will be explained below according to the example shown in the drawings.

In the figure, 1 is a valve box made of brass, and an inverted L-shaped flow path 2 is formed in the valve box 1, with one end opening facing downward and the other end opening facing horizontally. The end of the refrigerant pipe 20 on the outdoor unit side is inserted into the opening 2a at one end of the flow path 2 and connected by welding. A connecting pipe (not shown) for supplying refrigerant compressed on the outdoor unit side to the indoor unit is connected to the valve box through the flare nut 22 by forming a threaded portion 23 between the surface 21 and the flare nut 22. 1.

Further, the valve box 1 is formed with a valve hole 3 whose lower end opens in the middle of the flow path 2 and whose upper end opens above the valve box 1. 31 is provided around the circumferential wall of the valve hole 3, and a threaded part 32 is provided around the outer circumferential surface of the surrounding wall of the valve hole 3, leaving the opening side end part of the surrounding wall 30 of the valve hole 3, and the threaded part 32 is provided with the threaded part 32. Hole 3
A lid 33 is screwed on to close the opening.

Reference numeral 4 denotes a valve body for opening and closing the flow path 2, and a female thread 31 of the valve hole 3 is provided at the lower part of the outer peripheral surface of the valve body 4.
A male screw 41 is provided around the periphery, and these screws 31 and 41 form a threaded portion S for screwing the valve body 4 into the valve hole 3. A fitting groove 42 is formed, and the fitting groove 4
2 is fitted with an annular sealing material 43, and a hexagonal groove 44 is formed in the upper part of the valve body 4 into which an operating part of a hexagonal wrench can be inserted, and The valve body 4 is provided in the valve hole 3 so as to be freely movable relative to the flow path 2 by tightening or loosening, and the flow path 2 is opened and closed by the valve body 4.

In the above configuration, the present invention provides a locking mechanism that prevents the valve body 4 from being removed from the valve hole 3 by bending the peripheral wall 30 of the opening side end of the valve hole 3 inward in the radial direction. part 5 is integrally formed, the valve body 4 is locked in the locking part 5 in a state where the valve body 4 is screwed into the valve hole 3, and the screwing operation of the valve body 4 is performed. When the valve body 4 is engaged with the engagement portion 5,
This reduces the breaking strength of the threaded portion S against the load that causes the locking portion 5 to deform outward and the valve body 4 to separate from the valve hole 3.

That is, in the embodiment shown in the figure, as shown in FIG. 2, the inner diameter L1 of the valve hole 3 is 10 mm, and
The outer peripheral surface of the peripheral wall 30 of the opening side end of the valve hole 3, which becomes the locking part 5, is formed into a tapered shape, and the maximum wall thickness T1 of the peripheral wall 30 of the opening side end is 1.5 mm, and the minimum wall thickness T2.
1.3 mm, and after assembling the valve body 4 into the valve hole 3, the peripheral wall 30 is caulked radially inward as shown in FIGS. 1 and 3, and the locking portion 5 is By forming the opening diameter L2 of the valve hole 3 to 7.5 mm, the pushing up torque due to loosening of the valve body 4 is 150 mm.
Kg/cm or more, the locking portion 5 deforms outward in the radial direction and the valve body 4 separates from the valve hole 3, while the valve body 4 is screwed loose and the locking portion 5
The female screw 31 and the male screw 41 have a screwing width W of the male screw 41 with respect to the female screw 31 of about 2.5 threads, and the male screw 41 is screwed into the female screw 31 with the screwing width W. The breaking strength of at least one of the locking portions 5 is set to 120 Kg/cm or more, which is a torque lower than the deformation strength of the locking portion 5, and when a torque of 120 Kg/cm or more is applied to the valve body 4,
At least one of the screws 31, 41 is configured to be destroyed.

By the way, the radially outward deformation strength of the locking portion 5 is determined by the push-up torque caused by loosening the screw of the valve body 4.
The reason for setting it to 150 kg/cm or more is to facilitate the radially inward caulking work of the opening side end peripheral wall 30 when molding the locking portion 5.

Reference numeral 6 in the figure is a service port for air purge or refrigerant charging, and a check valve 7 is installed in the service port 6.

In the above-described shutoff valve device, the refrigerant pipe 20 on the outdoor unit side is connected to the opening 2a at one end of the flow path 2, and the valve body 4 is screwed with a hexagonal wrench to open the flow path 2. It is closed to prevent the refrigerant filling the outdoor unit from leaking out.

When installing the air conditioner, connect the refrigerant pipe on the indoor unit side to the other end opening 2b of the flow path 2, and then use the hexagonal wrench to connect the valve body 4.
The flow path B is opened by unscrewing the
During the opening operation of the flow path 4 described above, even if the valve body 4 is loosened with more torque than necessary, after the valve body 4 abuts the locking part 5, the threaded part S is formed. Since at least one of the screws 31 and 41 is destroyed, the valve body 4 does not move any further in the unscrewing direction, and the space between the valve hole 3 and the valve body 4 is closed by the sealing material 43. The purpose is to maintain a securely sealed state, thereby preventing accidents such as the refrigerant in the flow path 2 being discharged to the outside through the valve hole 3 or the valve body 4 flying off from the valve hole 3. can be reliably prevented.

(Effect of the invention) As described above, the present invention has a valve box 1 equipped with a flow path 2.
A valve hole 3 having one end communicating with the flow path 2 is provided, and a valve body 4 is screwed into the valve hole 3 through a threaded portion S so that the valve body 4 can freely move forward and backward. In the closing valve device configured to open and close the flow path 2,
The opening side end of the valve hole 3 is bent inward to form a locking part 5 that locks the valve body 4 from being removed from the valve hole 3. 3, the valve body 4 is locked to the locking part 5, and when the valve body 4 is locked in the locking part 5, the locking part 5 is on the outside side. The valve body 4 is deformed into
By reducing the breaking strength of the threaded portion S against the load that causes the valve to separate from the valve hole 3, the valve element 4 can be unscrewed with more torque than necessary when opening the flow path 2. The valve body 4 is connected to the locking portion 5
After coming into contact with, the threaded portion S will be destroyed, so
The valve body 4 does not move any further in the screwing direction, so that the refrigerant in the flow path 2 is discharged to the outside through the valve hole 3, and the valve body 4 does not move from the valve hole 3. This made it possible to reliably prevent accidents such as flying off.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a closing valve device according to the present invention;
FIG. 2 is a sectional view of the main part before the locking part 5 is formed;
FIG. 3 is a sectional view of a main part showing a state in which the valve body 4 is in contact with the locking portion 5, and FIG. 4 is a sectional view of a conventional closing valve device. 1... Valve box, 2... Channel, 3... Valve hole, 4...
Valve body, 5...locking part, S...screw part.

Claims (1)

[Scope of utility model registration request] A valve box 1 provided with a flow path 2 is provided with a valve hole 3 whose one end communicates with the flow path 2, and a valve body 4 is screwed into the valve hole 3 via a threaded portion S so as to freely move forward and backward. , in a closing valve device in which the flow path 2 is opened and closed by advancing and retracting the valve body 4, an opening side end of the valve hole 3 is bent inward to open and close the flow path 2 from the valve hole 3 of the valve body 4. A locking portion 5 is formed to lock the release of the valve body 4.
is screwed into the valve hole 3, and the valve body 4 is inserted into the valve hole 3.
is locked in the locking part 5, and when the valve body 4 is locked in the locking part 5, the locking part 5 is deformed outwardly and the valve body 4 is moved into the valve hole 3. A closing valve device characterized in that the breaking strength of the threaded portion S is reduced against a load released from the valve.