JP2670077B2 - Water hammer prevention device with pressure regulating function - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for preventing a water hammer generated in various pipes and equipment.

(B) Conventional Technology Conventionally, various types of water hammer preventive devices have been provided as a water hammer preventing device for preventing abnormal noise in pipes and water hammer causing water leakage. As one form, a water hammer is provided. There is a method in which a sudden pressure fluctuation caused by the above is absorbed by using a spring-biased valve element, a shock absorber, or the like arranged in a pipe.

(C) Problems to be solved by the invention However, in such a water hammer prevention device, since the retreat amount of the valve body is balanced with the inlet side pressure, that is, the primary side pressure, the neutral position is accompanied by the fluctuation of the inlet side pressure. Fluctuates significantly, and in order to absorb the water hammer, the valve body must be retracted to a neutral position or higher, which increases the moving volume of the valve body and enlarges the overall structure of the water hammer prevention device. Was supposed to.

An object of the present invention is to provide a water hammer prevention device that can solve the above problems.

(D) Means for Solving the Problems In the present invention, a water hammer prevention device having a pressure adjusting function is attached to a water supply pipe or a hot water supply pipe, and the water hammer prevention device has a) a valve body movement space formed inside. At the same time, a valve casing in which the inflow opening and the outflow opening are respectively connected to and communicated with a primary side flow passage which is an upstream side of the valve body and a secondary side flow passage which is a downstream side of the valve body, ) A valve element disposed in the valve element moving space so as to be able to advance and retreat in the axial direction;
C) A throttle portion which is formed between the outer peripheral surface of the valve body and the inner peripheral surface of the valve casing and which connects the inflow opening and the outflow opening for communication.
D) The valve element is constantly urged in the valve opening direction, and the valve element moves forward and backward in cooperation with the pressing force applied to the rear pressure-receiving surface of the valve element in the secondary flow path, and adjusts the opening area of the throttle section. The present invention relates to a water hammer prevention device having a pressure adjusting function, which is provided with a valve element urging means for performing pressure adjustment.

The present invention, in the water hammer prevention device having the above-mentioned configuration, when the water hammer occurs in the secondary side flow passage, in conjunction with the movement of the valve body in the closing direction, the valve body movement from the primary side flow passage It is also characterized in that an auxiliary flow passage that allows water or hot water equivalent to the volume to flow into the secondary flow passage is provided in the valve casing, and a water hammer prevention device is attached to the existing or new water supply or hot water supply pipe. Having.

(E) Action and Effect With the above configuration, the present invention has the following effects.

When a water hammer occurs, the secondary side valve body pressing force becomes larger than the urging force of the valve body urging means and moves the valve body in the closing direction, so the pressure energy of the water hammer is effective by the valve body urging means. It will be absorbed. Therefore, it is possible to reliably prevent the occurrence of abnormal sounds, water leakage accidents, and the like in the piping system and various devices.

At the time of water hammer occurrence, in conjunction with the movement of the valve body in the closing direction, since the auxiliary flow path is provided from the primary flow path, the water corresponding to the valve body moving volume flows into the secondary flow path,
Water can flow into the secondary flow passage from the primary flow passage through the auxiliary flow passage, and the valve body can be moved quickly. Therefore, the pressure energy generated by the water hammer can be quickly absorbed, and the occurrence of the above-described abnormal sound, water leakage accident, etc. can be reliably prevented.

The valve body biasing means always biases the valve body in the valve opening direction,
And, the valve body urging means, generally, move the valve body forward and backward in cooperation with only the secondary side valve body pressing force generated in the secondary side flow path, and adjust the opening area of the communication flow path. Because I tried to adjust the pressure,
It is possible to prevent the influence of the fluctuation of the primary pressure.
Therefore, the moving volume of the valve element can be made as small as possible, and the water hammer prevention device can be made compact.

(F) Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

In FIG. 1, reference numeral 10 is a hot and cold water mixing tap mounted on a wall surface W of a bathroom or the like. The hot and cold water mixing tap 10 has a water supply channel and a hot water supply channel on the left and right, respectively. The water supply start-up pipe 11 and the hot water supply start-up pipe 12 are connected to each other.
In addition, 12a is a spout.

In this embodiment, a water hammer prevention device B
Are built in the water supply starting pipe 11 and the hot water supply starting pipe 12.

Hereinafter, the structure of the water hammer preventing device B will be specifically described with reference to FIG. 2 and FIG. 3 which is a schematic diagram thereof. Since the structure of the hot and cold water mixing tap 10 is a well-known structure, the description thereof is omitted.

In FIG. 2, reference numeral 20 is a hollow cylindrical water supply riser pipe body, and the water supply riser pipe body 20 has an outflow opening 21 which communicates with a water supply passage of the hot and cold water mixing tap 10 or a hot water supply passage on one side wall on the upper side thereof.
In addition to the above, the lower side wall of the other side thereof is provided with a tubular connecting portion 22 that communicates with the water supply pipe and the hot water supply pipe.

In addition, the water supply riser pipe main body 20 includes a water hammer prevention device mounting cylinder 23 in which a water hammer prevention device B is incorporated, and a water stopcock or the like mounting portion arranged in parallel with the mounting tube 23.
Consists of 24.

A communication channel 25 is provided inside the mounting portion 24 such as a water stopcock, and an upper end of the communication channel 25 is formed through an inflow opening 26 provided in an upper side wall of the water hammer prevention device mounting cylinder 23. In the upper part of the valve moving space U formed in the water hammer prevention device mounting cylinder 23, a communication is made with a throttle portion 27 provided between the outer peripheral surface of the valve body a and the inner peripheral surface of the water hammer prevention device mounting cylinder 23. and, the diaphragm portion 27 communicates with the outlet opening 21 of the secondary-side flow path R _2.

On the other hand, the lower end of the communication channel 25 is connected to the tubular connecting portion 22 by a water stopcock 29 having a strainer 28.

Then, in the above configuration, the communication passage 25, and the primary flow passage R ₁ is formed, in the outlet opening 21, so that the secondary-side flow path R ₂ is formed.

Next, the structure of the water hammer prevention device B will be described. Reference character a is a plunger-shaped valve element disposed above the valve moving space U formed in the water hammer prevention device mounting cylinder 23 as a valve casing. Valve body a
Are arranged so as to be movable in the axial direction.

Then, the valve element a has the upper and lower expanded diameter portions a-1, a-2.
And an intermediate reduced diameter portion a-3, and an upper enlarged diameter portion a
-1 is located in the mounting cylinder 23 located above the inflow opening 26 during normal operation, and the intermediate reduced diameter portion a-3 is the inflow opening.
It is located at a position in the mounting cylinder 23 that can communicate with the 26, and the lower expanded diameter portion a-2 is located at a position below the inflow opening 26 in the mounting cylinder 23.

Further, a valve body urging means b for holding the valve body a at the above-mentioned position during normal operation is arranged in the lower portion of the water hammer prevention device mounting cylinder 23.

The valve element urging means b is composed of a first spring c, a second spring d, and an intermediate spring receiver 30 that are arranged in series in the water hammer prevention mounting cylinder 23 in the axial direction.

The first spring c abuts and supports the base end on the lower bottom wall 23a of the water hammer prevention device mounting cylinder 23, and
The upper end thereof abuts and supports the flange portion of the cup-shaped intermediate spring receiver 30.

On the other hand, the second spring d has a base end that receives the intermediate spring.
It is stored in the cup part of 30 and its upper end is
The valve body a is stored in the long hole 31 formed inside.
Abuts on the upper wall 32 of

In FIG. 2, reference numeral 33 denotes an air inlet hole provided in the lower portion of the water hammer prevention device mounting cylinder 23, which is provided for smooth operation of the springs c and d.

Further, in FIG. 2, e is the upper expanded portion a− of the valve body a.
1 is a slit provided in the axial direction along the outer peripheral surface of the valve body 1 to form an auxiliary flow path. As will be described later, when the valve body a is moved in the closing direction to absorb pressure fluctuation caused by the water hammer, can be gradually reduced inflow from side channels R ₁ to the secondary-side flow path R _2. In addition, such an auxiliary channel is
It can also be formed by tapering the upper enlarged portion a-1 of the valve element a.

Further, the water hammer preventing device B having the above configuration, among the valved body force of the valve body urging means b, the valve element an initial biasing force F _1, the secondary-side generated in the secondary-side flow path R in ₂ It is set to be equal to the valve body pressing force F ₂ , that is, F ₁ =
It is an F _2.

Then, in the present embodiment, the secondary side valve body pressing force F ₂ is accurately represented by F ₂ = P ₂ · Av + (Ac−Av) P ₁ .

Here, P ₁ is the primary pressure on the water shutoff tap side, and P ₂ is the secondary pressure on the hot and cold water mixing tap side. Av is the pressure receiving area of the rear pressure receiving surface of the valve element a, and Ac is the mounting cylinder in the throttle portion 27.
23 cross-sectional areas.

Thus, at the time of passing water operation, when the secondary side pressure P ₂ of the primary-side flow path R primary pressure P ₁ and the secondary-side flow path R in ₂ in ₁ varies, depending on the variation By moving the valve body a and adjusting the opening area A (FIG. 3) of the throttle portion 27, the inflow amount of water can be automatically adjusted.

Further, in this embodiment, as shown in FIGS. 2 and 3, the value of Ac-Av is made as small as possible, that is, the diaphragm portion.
Since the projected area, which is the difference between the cross-sectional area of the mounting cylinder 23 in 27 and the pressure receiving area Av of the valve body a, is made as small as possible, the above formula can be expressed by F ₁ = P ₂ · Av .

Therefore, the valve element a is constantly urged in the valve opening direction by the valve element urging means b, and the valve element urging means b is substantially pressed only by the secondary-side valve element pressing force generated in the secondary-side flow path. Since the valve body a is moved back and forth in cooperation with the above, and the opening area A of the throttle portion 27 is adjusted to adjust the pressure, it is possible to prevent the influence of the fluctuation of the primary pressure. Therefore, the moving volume of the valve body a (throttle 27
(Opening area A × stroke of valve body a) can be made as small as possible, and the water hammer prevention device B can be formed compactly.

Further, when the water hammer is generated by abruptly performing the water stopping operation, both the primary side pressure P ₁ and the secondary side pressure P ₂ increase. Then, due to the pressure increase, F ₁ <F ₂ . Thus, in this embodiment, the valve element a moves in the closing direction and compresses the valve element urging means b, and the instantaneous pressure energy of the water hammer causes the compression of the valve element urging means b. It will be converted into elastic energy and absorbed.

At this time, in this embodiment, since the slit e that forms the auxiliary flow path is provided on the outer peripheral surface of the valve element a, the moving volume of the valve element a (the opening area A of the throttle portion 27) is formed through the slit e.
Water corresponding to (stroke of valve body a) can be swiftly flowed into the hot and cold water mixing tap side from the water stop tap side. Therefore, the valve body a can be quickly moved in the closing direction to more quickly and reliably absorb the pressure fluctuation due to the water hammer.

Further, in this embodiment, the valve element urging means b is formed by the springs c and d connected in series,
The following effects can be obtained.

That is, the spring constants of the springs c and d are k ₁ and k ₂ , respectively, the combined spring constant of the springs c and d is k ₀ , the spring force of the springs c and d, that is, the valve body biasing force is F, and the stroke of the valve body a. Assuming that the amount is S, the resultant spring constant k ₀ and the valve body urging force F are expressed by the following equations, respectively.

k ₀ = k ₁ k ₂ / k ₁ + k ₂ F = k ₀ S = (k ₁ k ₂ / k ₁ + k ₂ ) S The valve urging force F changes as shown in FIG. Become.

Therefore, in the normal pressure fluctuation range, the combined spring constant k ₀ can be reduced, and the secondary pressure P _{2 in the} secondary flow path R ₂ can be reduced.
The opening area A of the throttle portion 27 is narrowed even with a slight increase in the pressure, and the pressure adjusting performance of the water hammer prevention device B is further improved.

The other components in FIG. 2 will be described. Reference numeral 35 is a cover, 36 and 37 are O-rings, and 38 is a cap nut for connection.

FIG. 5 shows another embodiment. This embodiment has substantially the same configuration as the water hammer prevention device B according to the above-described embodiment (FIGS. 2 and 3). However, in place of the intermediate reduced diameter portion a-3, a T-shaped flowing water channel including an axial passage a-4 and a radial passage a-5 is provided inside the valve body a, a passage a-5 as well as ₁ communicates with the primary flow path R, and has a feature to the configuration communicated to the upper end of the axial passage a-4 to the secondary-side flow path R _2.

Also in such a configuration, when the secondary side valve body pressure F ₂ fluctuates during the water supply operation, the valve body urging means b constantly urges the valve body a in the valve opening direction, and The urging means b substantially moves only in cooperation with the secondary side valve body pressing force F ₂ generated in the secondary side flow path R ₂ to move the valve body a forward and backward to move the throttle portion 27.
Since the opening area A is adjusted to adjust the pressure, it is possible to prevent the influence of the fluctuation of the primary pressure P ₂ .
Therefore, the moving volume of the valve body a can be made as small as possible, and the water hammer prevention device B can be made compact.

[Brief description of the drawings]

FIG. 1 is a front view of a hot and cold water mixing apparatus having a water hammer prevention device having a pressure regulating function according to the present invention, FIG. 2 is an internal structure explanatory view of the water hammer prevention device according to one embodiment, and FIG. FIG. 4 is a schematic diagram of the water hammer prevention device, FIG. 4 is a graph showing the relationship between the valve body biasing force and the stroke of the valve body, and FIG. 5 is an internal structure explanatory diagram of the water hammer prevention device according to another embodiment. . In the figure, A: Opening area B: Water hammer prevention device

Claims (3)

(57) [Claims] 1. A water hammer prevention device having a pressure regulating function is attached to a water supply pipe or a hot water supply pipe. The water hammer prevention device has a) a valve body moving space formed inside and an inlet opening and an outlet opening thereof. , A valve casing that communicates with a primary side flow passage that forms the upstream side of the valve body and a secondary side flow passage that forms the downstream side of the valve body, and (b) an axial direction in the valve body movement space. A) a valve element disposed so as to be able to move forward and backward; c) a throttle formed between the outer peripheral surface of the valve element and the inner peripheral surface of the valve casing for communicating and connecting the inflow opening and the outflow opening; The pressure is constantly urged in the valve opening direction, and the valve body moves forward and backward in cooperation with the pressing force applied to the rear pressure-receiving surface of the valve body in the secondary flow path, and adjusts the pressure by adjusting the opening area of the throttle. Water hammer having a pressure regulating function, comprising: Prevention device. 2. When a water hammer occurs in the secondary flow path, water corresponding to the valve element moving volume is transferred from the primary flow path to the secondary flow path in conjunction with the movement of the valve element in the closing direction. The water hammer prevention device having a pressure adjusting function according to claim 1, wherein an auxiliary flow passage for allowing the inflow is provided in the valve casing. 3. A water hammer prevention device having a pressure adjusting function according to claim 1 or 2, wherein the water hammer prevention device is attached to an existing or newly installed water supply pipe.