JPS6144041Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a check valve device.

There are various types of conventional check valves, but a typical one is the Jikoko 57-1 shown in Figure 1.
There is a check valve disclosed in Japanese Patent No. 1175, and the check valve shown in FIG. and a secondary side 3b, and a valve body 6 is provided on the secondary side 3b corresponding to the valve seat 5, and a protruding step portion 7 provided on the back surface 6a and the connecting fitting.
The valve seat 5 is constantly pressed by a spring 8 mounted between the valve seat 5 and the valve seat 5.

Therefore, when the pressure on the secondary side 3b increases, the valve body 6 is pressed by the valve seat 5 and seals the inside of the secondary side flow path 3b, so that this increased pressure cannot escape.

For example, when this check valve A is installed in the water supply pipe 18 of a water heater 20 equipped with a safety valve 20a as shown in FIG. This causes the following problems.

That is, when the water valve 19b of the hot water mixing faucet 19 is closed and only hot water is discharged, the water between the water valve 19b and the check valve A is warmed and expanded by the heat, and the pressure in the secondary flow path increases.

Therefore, due to this increased pressure, check valve A and water valve 19
b The water supply pipe 18 may rupture, or these connections may come loose and water may leak.

Furthermore, since a large pressure is applied to the check valve A, water leakage occurs in the check valve A as well.

Furthermore, even if both valves 19a and 19b are closed after opening and closing both the hot water valve 19a and the water valve 19b to use mixed water, the preheating of the water heater 20 causes the water heater 20 to
The water between the check valve A' and the check valve A' is also heated and expands, increasing the pressure on the secondary side. As a result, the water supply pipe 18' between the water heater 20 and the check valve A' may rupture, or the connection may come loose and water may leak.

Generally, a safety valve 20a is provided in the water heater 20, and its set pressure is set higher than the water pressure of the tap water supplied to the water heater 20. Therefore, when the water is warmed by preheating the water heater 20 and the pressure rises to the set pressure of the safety valve 20a, the safety valve 20a operates to release the increased pressure and water leaks.

Therefore, water is wasted every time the safety valve 20a is activated.

Further, if the rising pressure is lower than the set pressure of the safety valve 20a, the pressure remains applied to the water supply pipe etc. until the water heater 20 cools down, which is very inconvenient.

Therefore, when the pressure in the secondary flow path increases, as in the case of Utility Model Application Publication No. 55-34036 shown in Fig. 5, the valve seat is moved to the primary side in accordance with the pressure in order to release the increased pressure. It is possible to make it into a structure.

However, as shown in the drawing, the check valve shown in FIG. Even if the valve body 6 moves to the secondary side and opens the valve, water from the primary side will not pass between the outer peripheral surface of the valve body 6 and the inner peripheral surface of the valve seat member 5. At the same time, the spring 16 for the check valve that presses the valve body 6 toward the primary side is provided on the secondary side of the valve body 6, and the pressure that presses the valve seat member 5 toward the secondary side is maintained. Since the absorption spring 14 is disposed on the primary side of the valve seat member 5, the length of the entire check valve becomes long and the size becomes large.

Therefore, the problems that this invention attempts to solve are:
When the pressure on the secondary side increases, the valve seat moves according to the pressure to release this increased pressure, and the water flow rate is not affected during normal use, and the overall structure is compact. It is to be.

The technical means taken by the present invention to solve the above-mentioned problems is to include a first cylindrical member having a male threaded portion at one end and a flange portion on the inner peripheral surface, a female threaded portion at one end,
A cylindrical second member having a flange portion having an inner diameter slightly smaller than the inner diameter of the first member is provided on the inner circumferential surface adjacent to the female threaded portion.
A check valve main body that is threadedly connected to the first member and has an opening on the first member side as an inlet and an opening on the second member side as an outlet, and an outer diameter slightly smaller than the inner diameter of the first member. and a cylindrical valve seat member that has a valve seat hole in the center and is slidably installed in the main body between the flange of the first member and the flange of the second member. , a disk-shaped disk having an outer diameter smaller than the outer diameter of the valve seat member and larger than the inner diameter of the valve seat hole, and opening and closing the valve seat hole in correspondence with the valve seat hole from the secondary side on the outside of the valve seat member; The valve body is formed into a bottomed cylindrical shape having an outer diameter smaller than the inner diameter of the valve seat hole, the bottom wall of which is fixed to the primary side of the valve body, and a water passage hole is provided in the middle of the cylindrical portion at the open end. a guide member each having a flange projecting outward; and a guide member that extends from the guide member to an inner step provided on the inner circumferential surface of the valve seat member, and is elastically mounted to guide the valve body toward the secondary end surface of the valve seat member. a spring that presses the valve seat member;
The check valve is composed of a spring that presses against the flange of the member and a seal member that seals between the outer circumferential surface of the valve seat member and the inner circumferential surface of the first member.

According to such technical means of the present invention, when the pressure on the secondary side increases, the increased pressure causes the valve seat member provided between the flange portions of the first member and the second member that constitute the check valve main body to slides toward the primary side against the force of the spring to release the rising pressure.

In addition, during normal use, the spring provided on the inner periphery of the valve seat member is compressed to move the guide member and the valve body to the secondary side and separate the valve body from the secondary side end surface of the valve seat member. , water from the primary side flows between the outer peripheral surface of the valve body and the inner peripheral surface of the main body.

Since the present invention is constructed as described above, it has the following effects.

Since the valve seat member moves to the primary side together with the valve body, no large force is applied to the valve body, etc., and there is no risk of deformation of the valve body, etc.

Since the check valve has a small number of parts, its structure is simple and it is easy to assemble.

Since the spring is compressed by threading the first and second members together, a large amount of force is not required during assembly.

By compressing the spring provided on the inner circumference of the valve seat member and moving the guide member and the valve body to the secondary side and separating the valve body from the secondary side end face of the valve seat member, water from the primary side is removed from the valve body. Since water flows between the circumferential surface and the inner circumferential surface of the secondary flow path, water from the primary side flows between the outer circumferential surface of the valve body and the inner circumferential surface of the inner cylinder provided in the flow path, unlike the conventional type. Compared to this, the water flow area can be made wider and the amount of water flow will not be affected.

The spring for the check valve and the spring for pressure absorption are arranged on the inner and outer circumferential surfaces of the valve seat member, respectively, so this is different from the conventional method in which both are arranged on the primary and secondary sides of the valve body. In comparison, the size of the check valve is more compact, making it easier to incorporate it into the hot water mixing faucet body.

An embodiment of this invention will be described below based on the drawings.

In FIG. 3, numerals 9 and 10 represent a first member, and second members 1 and 2 represent an inlet and an outlet.

The first member 9 and the second member 10 are formed into a husband and wife tube shape, and have a male thread provided at the end of the first member 9 and a female thread provided at the end of the second member 10. The two threaded parts 11 of the part are screwed together to form the check valve main body C, and the inner surface thereof has an inlet 1 consisting of an opening on the first member 9 side and an outlet 2 consisting of an opening on the second member 10 side.
A flow path 3 is formed to communicate the two.

A flange portion 9a constituting a stepped portion is provided on the inner circumferential surface of the midway portion of the first member 9 so as to protrude inward.

Similarly, on the inner circumferential surface of the middle part of the second member 10, a flange 10a constituting a step is provided adjacent to the female threaded part.
The inner diameter of the collar portion 10a is slightly smaller than the inner diameter of the male screw portion of the first member 9.

Between the flanges 12 between the first member 9 and the second member 10
A valve seat member 5 having a valve seat hole 5' is attached to a seal member 1.
7 to connect the flow path 3 to the primary side 3.
It is divided into a and a secondary side 3b.

The valve seat member 5 is elastically loaded with a spring 14 between an outer step 5b provided on the outer circumferential surface of the primary end thereof and a flange upper surface 9b provided on the inner circumferential surface of the midway portion of the first member. The end surface 5a is abutted and locked to a flange 10a provided on the inner circumferential surface of the middle part of the second member 10.

Further, the inner diameter 5c of the valve seat member 5 is the second member 10.
The inner diameter 10 of the flange 10a provided on the inner peripheral surface of the middle part
The valve body 6 has a valve seat hole 5' having a diameter smaller than a', and is provided with a valve body 6 corresponding to the valve seat member 5 from the secondary side and opening the valve seat hole 5'.

The valve body 6 has an outer diameter larger than the inner diameter 5c of the valve seat hole 5' and smaller than the inner diameter 10a' of the flange 10a provided on the inner circumferential surface of the middle part of the second member 10, and is in contact with the valve seat member 5 to close the valve. To surely open a seat hole 5'. Further, the valve body 6 has a guide member 15 on its front surface 6b that is cylindrical with a bottom and has a water passage hole 15b in the middle of the cylindrical portion, and the guide member 15 is slidably installed in the valve seat hole 5'. There is.

Further, the valve body 6 is elastic between a flange 15a formed on the outer periphery of the primary end of the guide member 15 and an inner step 5d formed on the inner circumferential surface of the valve seat hole 5' of the valve seat member 5. The valve seat hole 5' is biased by the installed spring 16 in the direction of closing the valve seat hole 5'.

When such a check valve device is installed, for example, in the hot water supply device B shown in FIG. Even if the water in the water supply pipe 18 between the water valve 19b and the check valve A becomes hot and the pressure increases due to the thermal expansion of this water, the valve seat member 5 will not move on its upper surface as shown in FIG. The spring 14 is contracted together with the valve body 6 pressed by the check valve main body c, and the check valve main body c is slid on the primary side 3a, thereby increasing the volume of the secondary side flow path 3b.

Therefore, the increased pressure in the secondary flow path 3b can be released to the primary side, and the increased pressure between the water valve 19b and the check valve A can be prevented.

Furthermore, even if both the hot water valve 19 and the water valve 19b are opened to use mixed water, and both valves 19a and 19b are closed, the preheating of the water heater 20 causes the water heater 20 and the check valve to
The water in the water supply pipe 18' between the water heater 20 and the check valve A' is also heated, and even if the pressure rises due to thermal expansion of this water, rising pressure between the water heater 20 and the check valve A' is prevented in the same manner as described above. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional check valve, Fig. 2 is a schematic diagram of a water heater equipped with a check valve, and Fig. 3 is a sectional view of a check valve showing an embodiment of the present invention. , 4th
The figure is a sectional view showing the valve seat member of the check valve of the present invention in operation, and Figure 5 is a conventional check valve in which the valve seat member moves toward the primary side in response to an increase in pressure on the secondary side. FIG. In addition, in the figure, 1...inlet, 2...outlet, 5...
... Valve seat member, 5'... Valve seat hole, 5b... Outer stage part,
5d...inner stage part, 6...valve body, 9...first member,
9a...Step part, 10...Second member, 10a...Step part, 11...Threaded part (male threaded part, female threaded part), 1
4... Spring, 15... Guide member, 15a... Flange, 15b... Water hole, 16... Spring, 1
7... Seal member, C... Shows the check valve body, respectively.

Claims (1)

[Scope of utility model registration request] A cylindrical first member having a male threaded portion at one end and a flange portion on the inner circumferential surface, a female threaded portion at one end, and a flange portion whose inner diameter is slightly smaller than the inner diameter of the first member on the inner circumferential surface. and a cylindrical second member provided adjacent to the female threaded portion, the check valve body having an opening on the first member side serving as an inlet and an opening on the second member side serving as an outlet; The outer diameter is formed to be slightly smaller than the inner diameter of the first member, and the valve seat hole is formed in the center, and the inner peripheral surface of the first member is slidable between the flange of the first member and the flange of the second member. A cylindrical valve seat member is movably housed in the main body, and has an outer diameter smaller than the outer diameter of the valve seat member and larger than the inner diameter of the valve seat hole. A disk-shaped valve body that opens and closes the valve seat hole correspondingly from the side, and a bottomed cylindrical shape having an outer diameter smaller than the inner diameter of the valve seat hole, the bottom wall of which is fixed to the primary side of the valve body. and a guide member having a water passage hole in the middle of the cylindrical part and a flange projecting outward at the open end, and extending from the guide member to an inner step provided on the inner peripheral surface of the valve seat member. A spring is elastically loaded and presses the valve body against the secondary end surface of the valve seat member, and a spring is elastically loaded from the flange of the first member to an outer step provided on the outer peripheral surface of the valve seat member. A check valve device comprising a spring that presses a secondary end surface against a flange of a second member, and a seal member that seals between an outer circumferential surface of a valve seat member and an inner circumferential surface of the first member.