CN106939940A - Safety valve for liquid filling - Google Patents

Abstract

The invention discloses a safety valve for liquid filling, which comprises a valve core, a valve body and a piston; wherein, the valve core is installed on the valve body in an axially movable manner, and the valve core has a valve head , the upper part of the valve head is provided with an outer conical surface, the valve body is provided with a valve chamber that can accommodate the valve head, the part of the valve chamber located below the valve head is the lower chamber, and the valve body is provided with There is a liquid inlet and a liquid outlet, and the middle part of the valve cavity has a matching cone surface, and a liquid flow channel is formed between the matching cone surface and the outer cone surface, and the liquid flow channel is connected with the liquid inlet and the liquid outlet respectively. The liquid outlet is connected, and the piston is installed on the piston cavity of the valve body in an axially movable manner. The invention provides a safety valve for liquid filling, which can, when the filling liquid level exceeds the safety height, Make the filling system shut down automatically.

Description

Safety valves for liquid filling

technical field

The invention relates to a safety valve for liquid filling.

Background technique

At present, during the filling process of precious liquids, poisonous and harmful dangerous goods, due to the failure of the metering facilities or the failure of the system equipment, the liquid will flow out, causing property loss or personal injury. In order to ensure that the liquid does not flow out, it must be immediately Close the filling system.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a safety valve for liquid filling, which can automatically shut down the filling system when the filling liquid level exceeds a safe height.

In order to solve the above technical problems, the technical solution of the present invention is: a safety valve for liquid filling, which includes a valve core, a valve body and a piston;

Wherein, the valve core is installed on the valve body in an axially movable manner, and the valve core has a valve head, and the upper part of the valve head is provided with an outer tapered surface;

The valve body is provided with a valve cavity that can accommodate the valve head, the part of the valve cavity located below the valve head is the lower cavity, and the valve body is provided with a liquid inflow port and a liquid outflow port, and the valve cavity The middle part has a matching cone surface, and a liquid flow channel is formed between the matching cone surface and the outer cone surface, and the liquid flow channel is respectively connected with the liquid inlet and the liquid outlet; the axial movement of the valve core During the process, when the outer tapered surface and the mating tapered surface are abutted together, the liquid flow channel is closed, and when the outer tapered surface and the mating tapered surface are disengaged, the liquid channel is opened, And the gap of the liquid flow channel increases gradually from top to bottom; the valve body is also provided with a liquid level detection channel, the upper port of the liquid level detection channel is connected with the liquid flow channel, and the liquid level detection channel The lower port of the valve is a liquid level detection port, and a piston cavity is also arranged in the valve body, and the tail of the piston cavity is connected with the liquid level detection channel;

The piston is installed on the piston chamber of the valve body axially movable, and when the piston moves to the tail of the piston chamber under the action of the liquid level detection channel, the liquid inlet passes through the piston chamber and the lower chamber The lower chamber is disconnected from the liquid outlet through the piston chamber; when the piston is driven to move toward the head of the piston chamber, the liquid inlet is disconnected from the lower chamber through the piston chamber The lower chamber communicates with the liquid outlet through the piston chamber.

Further, a reset elastic element is provided between the valve core and the valve body to make the valve core move from bottom to top to reset.

Further, the valve body is provided with a first channel, a second channel, a third channel and a fourth channel, the first channel communicates with the liquid inlet, the second channel and the third channel respectively communicate with the lower cavity, the fourth passage communicates with the liquid outflow port, the tail of the piston is provided with a tail plug, and the piston has a first sealing contact with the inner wall surface of the piston chamber respectively. A plug and a second plug, the area of the piston chamber between the first plug and the second plug is the first open channel, and the area of the piston chamber between the second plug and the tail plug is The second open channel, when the piston moves to the tail of the piston chamber under the action of the liquid level detection channel, the liquid inflow port communicates with the first channel, the first open channel and the second channel in sequence and then connects with the lower chamber Communication; when the piston is driven to move towards the head of the piston chamber, the lower chamber communicates with the third channel, the second open channel and the fourth channel in turn, and then communicates with the liquid outlet.

Further, the valve body includes a valve seat body and a connecting pipe, and the liquid outlet is arranged on the connecting pipe.

Further, the valve seat body is provided with at least one waist-shaped hole, and the liquid inlet is connected to the liquid flow channel and the waist-shaped hole in sequence, and then connected to the liquid outlet.

Further, the liquid level detection channel includes a first liquid level through hole, a second liquid level through hole and a third liquid level through hole connected in sequence, the first liquid level through hole and the second liquid level through hole Set on the valve seat body, the third liquid level through hole is installed on the connecting pipe, the first liquid level through hole communicates with the liquid flow channel, and the lower port of the third liquid level through hole is the liquid A level detection port, the second liquid level through hole communicates with the tail of the piston chamber.

After adopting the above-mentioned technical scheme, the safety valve adopts a liquid flow path gradually increasing from top to bottom formed between the outer cone surface on the valve core and the matching cone surface on the valve cavity of the valve body. The safe height of the middle liquid level automatically realizes the stop of filling. When the liquid flows through here, the speed increases and the pressure decreases. The liquid level through hole and the second liquid level through hole are sucked into the first liquid level through hole. When filling, the safety valve is a one-way valve. The valve core is placed in the valve seat under the support of the spring, and the liquid flows from the liquid After the inflow port enters, the liquid pressure pushes the valve core to move downward, and the spring is completely compressed, so that there is a gap in the liquid flow channel between the outer cone surface of the valve core and the matching cone surface of the valve body, and the liquid passes through the liquid flow channel, from the waist The shaped hole flows to the connecting pipe and returns to the liquid pool. At this time, the safety valve is a one-way valve; when the liquid level in the liquid pool reaches the liquid level detection port, the gas in the third liquid level through hole is closed, because The low pressure at the first liquid level through hole makes the gas in the third liquid level through hole sucked into the first liquid level through hole. At a certain moment, the tail of the piston chamber is in a vacuum state, which makes the left and right ends of the piston The pressure is different, the piston moves to the right, the second channel is opened, the fourth channel is blocked, the liquid under pressure flows in from the first channel, and the second channel flows out, filling the lower part of the valve core (lower chamber), thereby pushing the valve core upward Move, the liquid flow channel is closed, and the filling stops. After the fault is eliminated, the head end of the piston is pulled to make the piston block the second channel, the third channel and the fourth channel are opened, and the filling starts. The invention has novel design and structure It is compact, easy to manufacture, easy to use, and low in cost. It can be used in production occasions such as filling toxic, harmful or valuable liquids to realize production automation and a safe production working environment.

Description of drawings

Fig. 1 is a structural diagram one of the safety valve for liquid filling of the present invention;

Fig. 2 is the second structural diagram of the safety valve for liquid filling of the present invention;

Fig. 3 is A-A sectional view of Fig. 2;

Fig. 4 is an enlarged view of part I in Fig. 1 .

detailed description

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figures 1 to 4, a safety valve for liquid filling, which includes a valve core 7, a valve body and a piston 4; wherein,

The spool 7 is axially movably mounted on the valve body, and the spool 7 has a valve head, and the upper part of the valve head is provided with an outer tapered surface 71;

A valve cavity capable of accommodating the valve head is arranged in the valve body, the part of the valve cavity located below the valve head is the lower cavity 30, and a liquid inflow port 10 and a liquid outflow port 20 are arranged in the valve body, so The middle part of the valve cavity has a matching cone surface 81, and a liquid flow channel 78 is formed between the matching cone surface 81 and the outer cone surface 71, and the liquid flow channel 78 is connected with the liquid inlet 10 and the liquid outlet 20 respectively. connected; during the axial movement of the spool 7, when the outer tapered surface 71 and the mating tapered surface 81 abut together, the liquid channel 78 is closed, and when the outer tapered surface 71 and the When the matching taper surface 81 is disengaged, the liquid flow channel 78 is opened, and the gap of the liquid flow channel 78 gradually increases from top to bottom; the valve body is also provided with a liquid level detection channel, and the liquid level The upper port of the detection channel is connected with the liquid flow channel 78, the lower port of the liquid level detection channel is the liquid level detection port 16, and a piston cavity is also arranged in the valve body, and the tail of the piston cavity is connected to the liquid level. The detection channels are connected;

The piston 4 is axially movably installed on the piston chamber of the valve body. When the piston 4 moves to the tail of the piston chamber under the action of the liquid level detection channel, the liquid inlet 10 passes through the piston chamber and the piston chamber. The lower chamber 30 is connected, and the lower chamber 30 is disconnected from the liquid outlet 20 through the piston chamber; when the piston 4 is driven to move toward the head of the piston chamber, the liquid inlet 10 passes through the piston chamber. The cavity is disconnected from the lower cavity 30 , and the lower cavity 30 is connected to the liquid outlet 20 through the piston cavity.

As shown in Figure 1, a reset elastic element is provided between the valve core 7 and the valve body to make the valve core 7 move from bottom to top to reset, specifically, a gasket 11 is provided on the valve core 7 and the retaining ring 12 for the shaft, one end of the spring is against the retaining ring 12 for the shaft, and the other end of the spring is against the valve body; specifically, the return elastic element can be a spring 9 .

As shown in Figure 1, the valve body is provided with a first channel E1, a second channel E2, a third channel E3 and a fourth channel E4, the first channel E1 communicates with the liquid inlet 10, so The second channel E2 and the third channel E3 communicate with the lower cavity 30 respectively, the fourth channel E4 communicates with the liquid outlet 20, and the tail of the piston is provided with a tail plug 43, The piston 4 has a first plug 41 and a second plug 42 that are in sealing contact with the inner wall of the piston chamber respectively, and the area of the piston chamber between the first plug 41 and the second plug 42 is the first plug. Open channel, the area of the piston chamber between the second plug 42 and the tail plug 43 is the second open channel, when the piston 4 moves to the tail Q of the piston chamber under the action of the liquid level detection channel, The liquid inflow port 10 communicates with the first channel E1, the first open channel and the second channel E2 in sequence and then communicates with the lower cavity 30; when the piston 4 is driven to move toward the head of the piston cavity, the lower cavity The cavity 30 communicates with the third passage E3, the second open passage and the fourth passage E4 in sequence, and then communicates with the liquid outlet 20; specifically, the first plug 41, the second plug 42 and the tail plug 43 and the piston Sealing rings 5 are arranged between the inner walls of the cavity to improve the sealing effect.

As shown in Figure 1, the valve body includes a valve seat body and a connecting pipe 1, and the liquid outlet 20 is arranged on the connecting pipe, specifically, the valve seat body includes a valve seat 8 and a housing 3, and the valve seat 8 is connected to the housing 3, and the joint between the valve seat 8 and the housing 3 and the joint between the valve seat 8 and the connecting pipe 1 are provided with sealing gaskets 2 .

As shown in Figures 2 and 3, the valve seat body is provided with at least one waist-shaped hole, and the liquid inlet 10 is connected to the liquid flow channel 78 and the waist-shaped hole in sequence, and then connected to the liquid outlet 20, specifically , There are four waist-shaped holes, which are the first waist-shaped hole F1, the second waist-shaped hole F2, the third waist-shaped hole F3, and the fourth waist-shaped hole F4.

As shown in Figures 1 and 2, the liquid level detection channel includes a first liquid level through hole E7, a second liquid level through hole E5 and a third liquid level through hole E6 connected in sequence, and the first liquid level through hole E7 and the second liquid level through hole E5 are set on the valve seat body, the third liquid level through hole E6 is set on the connecting pipe 1, and the first liquid level through hole E7 is connected with the liquid flow channel 78 The lower port of the third liquid level through hole E6 is the liquid level detection port 16, and the second liquid level through hole E5 communicates with the tail Q of the piston chamber.

The working principle of the present invention is as follows:

This safety valve adopts the liquid flow channel 78 gradually increasing from top to bottom formed between the outer cone surface 71 set on the valve core 7 and the matching cone surface 81 set on the valve cavity of the valve body. When the liquid flows through here, the speed increases and the pressure decreases. The flow rate at the liquid flow channel 78 is amplified, so that the fluid flows from the third liquid level through hole E6 to the second liquid level. The surface through hole E5 is sucked to reach the first liquid level through hole E7.

When filling, the safety valve is a one-way valve. In Figure 2, the valve core 7 is placed in the valve body under the support of the spring 9. After the liquid enters from the liquid inflow port 10, the liquid pressure pushes the valve core 7 downward. movement, the spring 9 is completely compressed, so that there is a gap in the liquid flow channel 78 between the outer cone surface 71 of the valve core 7 and the matching cone surface 81 of the valve body. One waist hole F1, the second waist hole F2, the third waist hole F3, and the fourth waist hole F4 flow to the connecting pipe 1 and return to the liquid pool 17. The safety valve at this time is a one-way valve.

When the liquid level in the liquid pool 17 reached the liquid level detection port 16, the gas in the third liquid level through hole E6 was closed, and due to the low pressure at the first liquid level through hole E7, the gas in the third liquid level through hole E6 was closed. The gas is sucked into the first liquid surface through hole E7. At a certain moment, the tail Q of the piston chamber is in a vacuum state, which makes the pressure at the left and right ends of the piston 4 unequal, and the piston 4 moves to the right. The second channel E2 Open, the fourth channel E4 port is blocked, the liquid with pressure flows in from the first channel E1 port, the second channel E2 port flows out, and fills the bottom of the valve core 7 (lower cavity 30), thereby pushing the valve core 7 to move upward, the valve The core 7 and the valve seat 8 are closed, and the filling stops. After the fault is eliminated, pull the head end of the piston 4, so that the piston 4 blocks the second channel E2, the third channel E3, and the fourth channel E4 are opened, and the filling starts .

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. A safety valve for liquid filling, characterized in that it comprises a spool (7), a valve body and a piston (4); wherein, The valve core (7) is axially movably mounted on the valve body, and the valve core (7) has a valve head, the upper part of which is provided with an outer cone surface (71); The valve body is provided with a valve chamber that can accommodate the valve head, the part of the valve chamber located below the valve head is the lower chamber (30), and the valve body is provided with a liquid inlet (10) and a liquid flow port. Outlet (20), the middle part of the valve cavity has a matching cone surface (81), a liquid flow channel (78) is formed between the matching cone surface (81) and the outer cone surface (71), and the liquid The flow channel (78) is connected with the liquid inlet (10) and the liquid outlet (20) respectively; during the axial movement of the spool (7), when the outer tapered surface (71) and the matching cone When the surfaces (81) are abutted together, the liquid flow path (78) is closed, and when the outer tapered surface (71) and the mating tapered surface (81) are disengaged, the liquid flow path (78) is opened , and the gap of the liquid flow channel (78) gradually increases from top to bottom; the valve body is also provided with a liquid level detection channel, and the upper port of the liquid level detection channel communicates with the liquid flow channel (78) , the lower port of the liquid level detection channel is a liquid level detection port (16), and a piston cavity is also arranged in the valve body, and the tail of the piston cavity communicates with the liquid level detection channel; The piston (4) is axially movably installed on the piston cavity of the valve body, and when the piston (4) moves to the tail of the piston cavity under the action of the liquid level detection channel, the liquid inflow port (10 ) is communicated with the lower chamber (30) through the piston chamber, and the lower chamber (30) is disconnected from the liquid outlet (20) through the piston chamber; when the piston (4) is driven to the piston chamber When the head moves, the liquid inlet (10) is disconnected from the lower chamber (30) through the piston chamber, and the lower chamber (30) is communicated with the liquid outlet (20) through the piston chamber . 2. The safety valve for liquid filling according to claim 1, characterized in that: a device is provided between the valve core (7) and the valve body to move the valve core (7) from bottom to top. Thus reset the reset elastic element. 3. The safety valve for liquid filling according to claim 1, characterized in that: the valve body is provided with a first channel (E1), a second channel (E2), a third channel (E3) and A fourth channel (E4), the first channel (E1) is in communication with the liquid inlet (10), the second channel (E2) and the third channel (E3) are respectively connected to the lower chamber (30) are connected, the fourth passage (E4) is connected with the liquid outlet (20), the tail of the piston is provided with a tail plug (43), and the piston (4) has a The first plug (41) and the second plug (42) that are in sealing contact with the inner wall of the cavity, and the area between the first plug (41) and the second plug (42) in the piston cavity is the first Open channel, the area between the piston cavity between the second plug (42) and the tail plug (43) is the second open channel, when the piston (4) moves toward the piston cavity under the action of the liquid level detection channel When the tail part (Q) moves, the liquid inflow port (10) communicates with the first channel (E1), the first open channel and the second channel (E2) in sequence and then communicates with the lower chamber (30); when the When the piston (4) is driven to move towards the head of the piston chamber, the lower chamber (30) communicates with the third channel (E3), the second open channel and the fourth channel (E4) in sequence, and then connects with the liquid outlet (20) connected. 4. The safety valve for liquid filling according to claim 1, characterized in that: the valve body includes a valve seat body and a connecting pipe (1), and the liquid outlet (20) is arranged on the connecting pipe (1) superior. 5. The safety valve for liquid filling according to claim 4, characterized in that: the valve seat body is provided with at least one waist-shaped hole, and the liquid inlet (10) is sequentially connected to the liquid flow channel ( 78) and the waist-shaped hole are connected to each other with the liquid outflow port (20). 6. The safety valve for liquid filling according to claim 4, characterized in that: the liquid level detection channel includes a first liquid level through hole (E7), a second liquid level through hole (E5) connected in sequence ) and the third liquid level through hole (E6), the first liquid level through hole (E7) and the second liquid level through hole (E5) are set on the valve seat body, the third liquid level through hole (E6) is set on the connecting pipe (1), the first liquid level through hole (E7) is connected with the liquid flow channel (78), and the lower port of the third liquid level through hole (E6) is the liquid The level detection port (16), the second liquid level through hole (E5) communicates with the tail (Q) of the piston cavity.