JP3242142U - safety valve - Google Patents

Abstract

A safety valve having a simple structure, easy processing and manufacturing, and low fluid resistance is provided. A safety valve includes a first valve body (1) having a first flow path (101), a second valve body (2) having a second flow path (201), one end of which is connected to one end of the first valve body, and a second valve body (2). A flapper unit comprising a drive unit 3 provided in one valve body, a flapper 401 provided in a first flow path, and a valve stem 402 whose one end is connected to the driving side of the drive unit and whose other end is fixedly connected to the flapper. 4, wherein the valve stem is suitable for rotationally driving the flapper by the action of the drive side, and the first flow path is in an open state where the axis of the flapper is perpendicular to the axis of the first valve body, and in an open state where the axis of the flapper is the first. 1 has a closed state that overlaps with the axis of the valve body. The present invention solves the problems of the prior art that the valve seat structure of the safety valve is complicated, difficult to process, has high fluid resistance, and is disadvantageous to fluid circulation. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to the technical field of fluid safety valves, and in particular to safety valves.

In urban water supply construction and industrial water supply construction, many water supply pipes are laid to send water to each point of use. When a water supply pipe bursts, a large amount of water leaks, affecting people's normal life and causing waste of water resources. For this reason, water supply pipes are often provided with safety valves to cope with the occurrence of pipe rupture. This kind of safety valve does not need an electric drive, it can close the water supply pipe quickly and accurately only by taking the pipe pressure before and after the valve as a judgment condition and driving the operation by the fluid pressure in the pipe, so that the Reduce the impact of water leakage and reduce wastage of water resources.

A conventional safety valve generally consists of three parts: a valve seat, a pressure-measuring pipe and a drive unit. The valve seat is connected to the pressure-measuring pipe. It has a passage and the inner diameter of the valve seat is larger than the inner diameter of the pressure-measuring tube. The drive unit has a drive valve seat, a piston is provided in the drive valve seat, the upper side of the piston communicates with the valve seat, the lower side communicates with the pressure measuring pipe, and the piston rod has one end connected to the piston and the other end. extends into the valve seat with a valve disc at the end and a return spring further fitted on the piston rod.

The valve disc of the conventional safety valve moves linearly, and the direction of motion is perpendicular to the axial direction of the valve seat and the pressure measuring tube. If the arcuate structure does not engage the valve disc, the action of closing the passage cannot be achieved. Therefore, the structure of the valve seat becomes complicated, and the processing difficulty is high. Arcuate structures and valve discs also increase fluid flow resistance, which is detrimental to fluid flow.

Therefore, the technical problem to be solved by the present invention is to solve the defects in the prior art that the valve seat structure of the safety valve is complicated, the processing is difficult, the fluid resistance is high, and the fluid circulation is disadvantageous. Another object is to provide a safety valve which has a simple structure, is easy to process and manufacture, and has low fluid resistance.

In order to solve the above problems, the present invention
a first valve body having a first flow path;
a second valve body having a second flow path communicating with the first flow path, one end of which is connected to one end of the first valve body;
a drive unit provided in the first valve body or the second valve body;
a flapper unit provided in the first flow path, and a valve stem having one end connected to the drive side of the drive unit and the other end fixedly connected to the flapper, wherein the valve stem is Suitable for rotating the flapper by the action of the drive side, the first flow path is in an open state in which the axis of the flapper is orthogonal to the axis of the first valve body, and in an open state in which the axis of the flapper is perpendicular to the axis of the first valve. a flapper unit having an overlapping closed state with a body axis.

Optionally, a protruding structure is molded into said first channel, and an outer edge of said flapper is in close contact with an inner wall of said protruding structure when said first channel is in said closed state.

Optionally, said protrusion structure is an annular protrusion, said flapper is disc-shaped, and an inner diameter of said annular protrusion is equal to a diameter of said flapper.

Optionally, the point of connection between said valve stem and said flapper is offset from the center of said flapper.

Optionally, said flapper unit further comprises a pivot shaft, said pivot shaft being fixed to said flapper, said pivot shaft being fixedly connected to said end of said valve stem remote from said drive side.

Optionally, said drive unit is provided in said first valve body and comprises a valve seat, a drive rod, a piston and an elastic member, said valve seat having a cavity, said A piston is provided, and the drive rod has one end fixedly connected to the piston and the other end extending outside the valve seat to abut against the valve stem, and the elastic member is fitted onto the drive rod. one end of which contacts the piston and the other end of which contacts the inner wall of the valve seat.

Optionally, the axial direction of said drive rod is parallel to the axial direction of said first valve body.

Optionally, the side of said piston connected to said drive rod communicates with said second flow path and the side of said piston remote from said drive rod communicates with said first flow path.

Optionally, the first valve body is provided with a first connection port, the first connection port communicates with the first flow path, the second valve body is provided with a second connection port, and the second valve body is provided with a second connection port. 2 connection port communicates with the second flow path, the side of the piston connected to the drive rod is connected to the second connection port via a first pipe, and the side of the piston remote from the drive rod is connected to the first connection port through a second pipe.

Optionally, the diameter of said first channel is larger than the diameter of said second channel.

The present invention has the following advantages.

1. In the safety valve according to the present invention, the first valve body has the first flow path, the second valve body has the second flow path, and the first flow path and the second flow path are communicated to allow fluid flow. used for flowing The flapper unit includes a flapper and a valve stem, the flapper is provided in the first flow path, and the valve stem has one end connected to the drive side of the drive unit and the other end fixedly connected to the flapper. The valve stem is driven by the drive unit to rotate the flap, and when the axis of the flap is perpendicular to the axis of the first valve body, the first flow path is open and the axis of the valve body is aligned with the first valve body. , the first channel is closed. The first flow path can be closed by bringing the flapper into close contact with the inner wall of the first valve body, and the structure of the first valve body is simple and easy to process. When the first channel is open, the flow area of the first channel occupied by the flapper is small, and the first valve body does not need to be installed with other structures for changing the flow direction of the fluid, so the safety valve The overall fluid resistance is also small.

2. In the safety valve according to the present invention, a protrusion structure is formed in the first flow path, the protrusion structure is preferably an annular protrusion, the flapper is disk-shaped, the inner diameter of the annular protrusion is equal to the diameter of the flapper, and the flapper is Rotating the outer edge of the flapper into intimate contact with the inner wall of the protruding structure can close the first flow path and interrupt fluid flow. The structure of the first valve body is simplified, and processing and manufacturing are easy. The flapper unit is easy to operate and control and is capable of closing the first channel quickly and accurately.

3. In the safety valve according to the present invention, the connection point between the valve stem and the flapper is offset from the center of the flapper, thus the force required for the valve stem to rotate the flapper is small, and the operation is easy.

In order to describe the specific embodiments of the present invention or the technical solutions of the prior art more clearly, the following briefly describes the drawings used to describe the specific embodiments or the prior art, Apparently, the drawings described below are just some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

1 is a schematic diagram of a safety valve of the present invention; FIG.

The following clearly and completely describes the technical solutions of the present invention with reference to the drawings, and it is obvious that the described embodiments are some embodiments of the present invention, not all of them. . Based on the embodiments of the present invention, other embodiments obtained without creative efforts by those skilled in the art are within the scope of the utility model registration claims of the present invention.

It should be noted that in the description of the present invention, directions or Positional relationships are based on illustrated orientations or positional relationships and are used only to facilitate and simplify the description of the present invention, such devices or components necessarily have a particular orientation, It is not intended or implied to be constructed or operated in any particular orientation and should not be construed as limiting the invention. Also, it should be understood that the terms "first," "second," and "third" are used for descriptive purposes only and do not indicate or imply relative importance.

In the description of the present invention, the terms ``attach'', ``connection'', and ``connection'' should be understood in a broad sense unless otherwise clearly defined or restricted. or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or an internal communication between the two elements. A person skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

Also, the technical features of different embodiments of the present invention described below can be combined with each other as long as they are not inconsistent with each other.

A preferred embodiment of the safety valve of the present invention is shown in FIG. Such a safety valve is suitable to be attached to the water supply pipe, and in the event of a pipe rupture, it can close the valve quickly and accurately, cut off the fluid flow, without the need for manual intervention, and prevent water leakage. Reduce the impact of pollution on people's daily lives and reduce the wastage of water resources.

The safety valve comprises a first valve body 1 , a second valve body 2 , a drive unit 3 and a flapper unit 4 . The first valve body 1 has a cylindrical first flow path 101 , a first connection port 103 is opened in the first valve body 1 , and the first connection port 103 communicates with the first flow path 101 . Flanges are provided at both ends of the first valve body 1 . Also, a protrusion structure 102 is formed on the first channel 101, and specifically, in this embodiment, the protrusion structure 102 is preferably an annular protrusion. The second valve body 2 has a cylindrical second flow path 201 , a second connection port 202 is opened in the second valve body 2 , and the second connection port 202 communicates with the second flow path 201 . Both ends of the second valve body 2 are similarly provided with flanges.

One end of the second valve body 2 is connected to one end of the first valve body 1 via a flange to seal the connection. The other end of the first valve body 1 and the other end of the second valve body 2 can be connected to a water supply pipe through a flange, the other end of the first valve body 1 is a liquid supply end, and the second valve body 2 is the drain end. When the first valve body 1 and the second valve body 2 are connected, the first flow path 101 and the second flow path 201 are communicated and used for fluid flow, and the diameter of the first flow path 101 is the second flow path. larger than the diameter of channel 201.

Further, the drive unit 3 is provided on the first valve body 1 or the second valve body 2 and is mainly used to drive the flapper unit 4 to operate. Specifically, in this embodiment, the drive unit 3 is provided on the first valve body 1 and fixedly connected to the first valve body 1 via bolts and nuts. 302 , a piston 303 and an elastic member 304 . The valve seat 301 is composed of connected left and right valve lids, the left and right valve lids defining a cavity in which a piston 303 is provided, the piston 303 and the left valve lid defining the left cavity. , and the piston 303 and the right valve cap define the right cavity. The driving rod 302 has one end fixedly connected to the piston 303, the other end extending outside the valve seat 301, connected to the flapper unit 4, and the one end extending outside the valve seat 301 being the driving side. . The axial direction of the drive rod 302 is parallel to the axial direction of the first valve body 1 . An elastic member 304 is fitted onto the drive rod 302 , and one end of the elastic member contacts the piston 303 and the other end contacts the inner wall of the valve seat 301 . In this embodiment, elastic member 304 is preferably a spring.

The side of the piston 303 connected to the drive rod 302 communicates with the second flow path 201, that is, the left cavity communicates with the second flow path 201, and the side of the piston 303 away from the drive rod 302 communicates with the first flow path 101. , that is, the right cavity communicates with the first channel 101 . Specifically, in this embodiment, the left valve cover of the valve seat 301 is provided with a third connection port, and the second connection port 202 and the third connection port are communicated through the first pipe 5, thereby The pressure of the fluid in the second flow path 201 can be guided to the side of the piston 303 connected to the driving rod 302, the first connection port 103 and the fourth connection port communicate through the second pipe 6, Thereby, the pressure of the fluid in the first flow path 101 can be guided to the side of the piston 303 away from the drive rod 302 . When the pressure difference between both sides of the piston 303 is greater than the elastic force of the spring, the driving rod 302 can be pushed to move to the left, and the flapper unit 4 can be driven to move. When the pressure difference between both sides of the piston 303 is less than the elastic force, the spring resets and moves the driving rod 302 to the right.

Further, the flapper unit 4 includes a flapper 401 and a valve stem 402. The flapper 401 is provided in the first flow path 101, one end of the valve stem 402 is connected to the drive side of the drive unit 3, and the other end is a flapper. 401 is fixedly connected. The valve stem 402 is suitable for rotationally driving the flapper 401 along the radial direction of the first flow path 101 by the action of the drive side of the drive unit 3 . The first flow path 101 has an open state in which the axis of the flapper 401 is orthogonal to the axis of the first valve body 1 and a closed state in which the axis of the flapper 401 overlaps the axis of the first valve body 1 . When the first channel 101 is closed, the outer edge of the flapper 401 is in close contact with the inner wall of the protrusion structure 102 formed on the first channel 101 . Specifically, in this embodiment, since the protrusion structure 102 is preferably an annular protrusion, the flapper 401 is preferably disk-shaped, and the inner diameter of the annular protrusion is equal to the diameter of the flapper 401 . In this way, the flapper 401 can be in close contact with the annular protrusion to block the passage of fluid.

The connection point between the valve stem 402 and the flap 401 is displaced from the center of the flap 401, that is, the connection point between the two is at an eccentric position. and the first channel 101 can be closed quickly.

The flapper unit 4 further comprises a pivot shaft 403 which is fixed to the flapper 401 and which is fixedly connected to the end of the valve stem 402 remote from the drive side.

The principle of operation of the safety valve according to this embodiment will be described below.

The safety valve is attached to the water supply pipe, the end of the first valve body 1 away from the second valve body 2 is used as a liquid supply end, and the end of the second valve body 2 away from the first valve body 1 is used as a liquid discharge end. Water in the water supply pipe enters from the feed end and flows out from the drain end. When the safety valve operates normally, the water pressure in the first flow path 101 and the second flow path 201 is a stable value, the flow velocity of the water flowing through the first flow path 101 and the second flow path 201 is also a stable value, and the piston The pressure difference between both sides of 303 is smaller than the elastic force, and the piston 303 is located at the rightmost end in the cavity of the valve seat 301 . At this time, the axis of the flapper 401 is perpendicular to the axis of the first valve body 1, and the first flow path 101 is open.

When a pipe rupture occurs downstream of the second valve body 2, the flow velocity and flow rate of the fluid flowing through the first flow path 101 and the second flow path 201 rapidly increase, and the pressure difference between both sides of the piston 303 becomes larger than the elastic force. Large, in this case, the action of the water pressure pushes the drive rod 302 to move to the left, and further pushes the valve stem 402 to drive the flapper 401 to rotate. Since the connection point between the flapper 401 and the valve stem 402 is shifted from the center of the flapper 401, after the flapper 401 rotates, the water flowing through the first flow path 101 collides with the surface of the flapper 401, and the outer edge of the flapper 401 forms an annular projection. When the rotation of the flapper 401 is accelerated until it comes into close contact with the inner wall of the water supply pipe, and the first flow path 101 is closed, water can no longer flow from the liquid supply end to the liquid discharge end, and water will flow to the damaged portion of the water supply pipe. does not leak from

In another embodiment, the drive unit 3 may be fixedly attached to the second valve body 2 .

Obviously, the above examples are merely illustrative examples and are not intended to limit the embodiments. Those skilled in the art can make various other changes and modifications based on the above description. It is not necessary or impossible to cover all of the embodiments here. Obvious changes and modifications derived from this also belong to the scope of utility model registration claims of the present invention.

REFERENCE SIGNS LIST 1 first valve body 101 first flow path 102 projection structure 103 first connection port 2 second valve body 201 second flow path 202 second connection port 3 drive unit 301 valve seat 302 drive rod 303 piston 304 elastic member 4 flapper unit 401 flapper 402 valve stem 403 pivot shaft 5 first pipe 6 second pipe

Claims (10)

a safety valve,
a first valve body (1) having a first flow path (101);
a second valve body (2) having a second flow path (201) communicating with the first flow path (101), one end of which is connected to one end of the first valve body (1);
a drive unit (3) provided in the first valve body (1) or the second valve body (2);
A flapper (401) provided in the first flow path (101), and a valve stem (402) one end of which is connected to the drive side of the drive unit (3) and the other end of which is fixedly connected to the flapper (401). ), wherein the valve stem (402) is suitable for rotationally driving the flapper (401) by the action of the driving side, and the first flow path (101) is the A flapper having an open state in which the axis of the flapper (401) is perpendicular to the axis of the first valve body (1) and a closed state in which the axis of the flapper (401) overlaps the axis of the first valve body (1). A safety valve, characterized in that it comprises a unit (4). A protrusion structure (102) is formed in the first channel (101), and when the first channel (101) is in the closed state, the outer edge of the flapper (401) is the inner wall of the protrusion structure (102). 2. The safety valve of claim 1, wherein the safety valve is in close contact with the The safety valve according to claim 2, characterized in that said protrusion structure (102) is an annular protrusion, said flapper (401) is disc-shaped, and the inner diameter of said annular protrusion is equal to the diameter of said flapper (401). . The relief valve of claim 1, wherein the connection point between the valve stem (402) and the flapper (401) is offset from the center of the flapper (401). Said flapper unit (4) further comprises a pivot shaft (403), said pivot shaft (403) is fixed to said flapper (401), said pivot shaft (403) is connected to said driving side of said valve stem (402). 5. Safety valve according to claim 4, characterized in that it is fixedly connected to the end remote from the . The drive unit (3) is provided on the first valve body (1) and includes a valve seat (301), a drive rod (302), a piston (303), and an elastic member (304). The valve seat (301) has a cavity, the piston (303) is provided in the cavity, the driving rod (302) has one end fixedly connected to the piston (303) and the other end connected to the valve seat. (301) and abuts on the valve stem (402), the elastic member (304) is fitted on the drive rod (302), and one end abuts on the piston (303). , the other end abuts against the inner wall of the valve seat (301). 7. Safety valve according to claim 6, characterized in that the axial direction of the drive rod (302) is parallel to the axial direction of the first valve body (1). The side of the piston (303) connected to the drive rod (302) communicates with the second flow path (201), and the side of the piston (303) away from the drive rod (302) communicates with the first flow path. 7. Safety valve according to claim 6, characterized in that it communicates with (101). A first connection port (103) is opened in the first valve body (1), the first connection port (103) communicates with the first flow path (101), and is connected to the second valve body (2). A second connection port (202) is opened, the second connection port (202) communicates with the second flow path (201), and the side of the piston (303) connected to the drive rod (302) is the second 1 pipe (5) to the second connection port (202), the side of the piston (303) away from the drive rod (302) is connected to the first connection port via the second pipe (6) 9. Safety valve according to claim 8, characterized in that it is connected to (103). A safety valve according to any one of the preceding claims, characterized in that the diameter of said first channel (101) is greater than the diameter of said second channel (201).

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