Pneumatic head diaphragm valve driven at low pressure and capable of rotating

Abstract

The invention discloses a low-pressure driven and rotatable pneumatic head diaphragm valve, and belongs to the technical field of diaphragm valves, the low-pressure driven and rotatable pneumatic head diaphragm valve comprises a pneumatic head rotatably mounted on a valve body base, the pneumatic head comprises a pneumatic head base, a pneumatic head body and a gland, a driving air source inlet is formed in the side face of the pneumatic head body, a plurality of pistons are arranged in a cavity of the pneumatic head, and a driving air source is arranged in the driving air source inlet. And elastic pieces are arranged between the gland and the pistons and between the pistons. According to the low-pressure-driven and rotatable pneumatic head diaphragm valve, the driving air source inlet is formed in the side face of the pneumatic head, the pneumatic head can rotate by 360 degrees on the valve body base, and the low-pressure-driven and rotatable pneumatic head diaphragm valve can adapt to various installation occasions for installation and is used for various working conditions; the multiple pistons are arranged in the pneumatic head, the elastic pieces are arranged between the pistons and the gland and between the pistons, when the pneumatic valve is opened, the pressure of the two sets of elastic pieces needs to be resisted at the same time, and therefore the force value of the elastic pieces is increased, the stacked pressure of the elastic pieces is balanced under the condition that the driving pressure is not changed, and valve abrasion is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of diaphragm valves, in particular to a low-pressure driven and rotatable pneumatic head diaphragm valve. Background Art

[0002] A pneumatic diaphragm valve is a stop valve that uses air pressure and spring force to open and close. The drive interface of a general pneumatic diaphragm valve is at the top of the pneumatic head, which is directional and prone to position interference due to design errors or assembly errors during use. In addition, an existing pneumatic diaphragm valve generally has only one piston in one pneumatic head, which uses the driving pressure and the cross-sectional area of ​​the piston cavity to counteract the spring force. This counteracting force is generally only 1 MPa, which limits the normal working pressure of the valve. Therefore, in some situations where a larger working force is required and the overall volume of the valve is required to remain unchanged, the piston in the pneumatic head needs to be made very large. The large piston volume will correspondingly lead to an increase in the outer circle of the pneumatic head, affecting the normal installation of the valve. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the existing pneumatic diaphragm valve increases the working force by increasing the volume of the piston, thereby having to increase the outer circle of the pneumatic head, which affects the normal installation of the valve. A low-pressure driven and rotatable pneumatic head diaphragm valve is proposed, in which the driving air source inlet is arranged on the side of the pneumatic head. The pneumatic head can rotate 360° for adjustment according to actual working conditions, and multiple pistons are arranged in the pneumatic head cavity to increase the piston force while keeping the diameter of the pneumatic head unchanged.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A low-pressure driven and rotatable pneumatic head diaphragm valve comprises a pneumatic head, the pneumatic head comprising a pneumatic head base, a pneumatic head body and a gland, a driving air source inlet is arranged on the side of the pneumatic head body, a gland step is also arranged on the inner wall of the gland, the pneumatic head body is connected to the pneumatic head base, and the gland is arranged at one end of the pneumatic head body away from the pneumatic head base; An upper piston, a middle piston and a lower piston are also provided in the cavity of the pneumatic head. The upper piston can abut against the step of the gland to limit its position. The middle piston is sleeved on the lower piston and is located between the upper piston and the lower piston. The middle piston can abut against the end of the gland to limit its position. Elastic parts are provided between the gland and the upper piston and between the upper piston and the middle piston.

[0005] As a further description of the above technical solution, it also includes a valve body base, in which a fluid channel is provided, and the pneumatic head can be installed on the valve body base in a 360° rotation manner through a connector.

[0006] As a further description of the above technical solution, the connecting piece has a vertical through hole in the center, and has a first end and a second end. The outer circumference of the first end is cylindrical, and the first end is inserted into the valve body base and can rotate in the valve body base. The outer circumference of the second end is a hexagonal nut shape, which is convenient for rotating the pneumatic head with the help of tools such as wrenches, thereby adjusting the direction of the pneumatic head according to the needs of the installation site.

[0007] As a further description of the above technical solution, one end of the pneumatic head base has an outward flange, the pneumatic head base is inserted into the vertical through hole of the connecting piece, and the flange abuts against the end face of the first end of the connecting piece, and the center of the pneumatic head base has a step hole, and the center axis of the step hole coincides with the center axis of the vertical through hole.

[0008] As a further description of the above technical solution, it also includes a valve stem, a pressure block and a diaphragm. The diaphragm is fixed at the outlet of the liquid inlet pipe hole and is used to open or close the fluid channel. The pressure block is located in the step hole of the pneumatic head base and is pressed on the diaphragm. One end of the valve stem is inserted into the step hole of the pneumatic head base and pressed on the pressure block, and the other end is inserted into the cavity of the pneumatic head body. The upper piston and the lower piston are both mounted on the valve stem.

[0009] As a further description of the above technical solution, a seal installation groove is provided at the other end of the pneumatic head base, a pneumatic head seal is sleeved in the seal installation groove, and the pneumatic head body and the pneumatic head base are sealed by the pneumatic head seal.

[0010] As a further description of the above technical solution, the upper piston, the middle piston and the lower piston are all provided with piston sealing grooves on their outer peripheries, and piston seals are installed in the piston sealing grooves for sealing with the inner wall of the pneumatic head.

[0011] As a further description of the above technical solution, the pneumatic head body is also provided with a pneumatic head exhaust hole, and the pressure cover is provided with a pressure cover exhaust hole, which are used to exhaust the cavity gas during operation.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) Multiple pistons are added to the pneumatic head to increase the piston force while keeping the diameter of the pneumatic head unchanged. Multiple elastic parts are set between the piston and the gland and between the pistons. When the driving pressure remains unchanged, the superposition of the elastic parts can also prevent valve wear; (2) The pneumatic head can rotate 360° on the valve body base to adapt to various installation conditions and save installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of a low-pressure driven and rotatable pneumatic head diaphragm valve of the present invention; Figure 2It is a cross-sectional view of a low-pressure driven and rotatable pneumatic head diaphragm valve of the present invention; Figure 3 is a cross-sectional view of a connector of the present invention; Figure 4 is a cross-sectional view of the pneumatic head base of the present invention; Figure 5 is a cross-sectional view of the pneumatic head body of the present invention; Figure 6 is a cross-sectional view of the gland of the present invention; Figure 7 It is a cross-sectional view of the valve body base of the present invention.

[0014] Legend: 1-pneumatic head; 11-pneumatic head base; 111-flange; 112-step hole; 113-seal mounting groove; 114-pneumatic head seal; 12-pneumatic head body; 121-driving air source inlet; 122-pneumatic head exhaust hole; 123-base hole 124-first step; 125-second step; 126-third step; 13-pressure cover; 131-pressure cover step; 132-pressure cover Exhaust hole; 133-plug-in section; 134-exposed section; 14-upper piston; 15-middle piston; 16-lower piston; 17-elastic member; 18-piston seal; 2-connector; 201-through hole; 202-first end; 203-second end; 3-valve body base; 31-liquid inlet hole; 32-liquid outlet hole; 33-partition; 34-fluid channel; 4-valve stem; 5-pressure block; 6-diaphragm. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] This embodiment provides a low-pressure driven and rotatable pneumatic head diaphragm valve, such as Figure 1 — Figure 7As shown, it includes an air actuator 1, and the air actuator 1 includes an air actuator base 11, an air actuator body 12 and a pressure cover 13; the air actuator base 11 has a thick end and a thin end, and the end of the thick end has an outward flange 111, the center of the air actuator base 11 has a step hole 112, and the outer wall of the thin end of the air actuator base 11 is provided with a sealing member mounting groove 113; the bottom of the air actuator body 12 is provided with a base hole 123 for inserting the air actuator base 11, and the inner wall of the air actuator body 12 is also formed with a first step 124, a second step 125 and a third step 126, and a driving air source inlet 121 and an air actuator exhaust hole 122 are provided on the side of the air actuator body 12, and the driving air source inlet 121 is located between the first step 124 and the second step 125, the pneumatic head exhaust hole 122 is located at the third step 126; the pneumatic head body 12 is sleeved on the pneumatic head base 11 and is located outside the thin end, the pneumatic head seal 114 is installed in the seal installation groove 113, and the pneumatic head body 12 and the pneumatic head base 11 are sealed and connected by the pneumatic head seal 114; the gland 13 has an insertion section 133 and an exposed section 134, the insertion section 133 is inserted into the pneumatic head body 12, and there is a distance between the end of the insertion section 133 and the third step 126 of the pneumatic head body 12, the inner wall of the gland 13 is also provided with a gland step 131, and a gland exhaust hole 132 is opened on the side wall of the gland 13, and the gland exhaust hole 132 is located on the side wall of the exposed section 134; The pneumatic head 1 is also provided with an upper piston 14, a middle piston 15 and a lower piston 16. The upper piston 14 and the lower piston 16 are both sleeved on the valve stem 4, and the middle piston 15 is sleeved on the lower piston 16. The upper piston 14, the middle piston 15 and the lower piston 16 have piston sealing grooves on their outer peripheries. The piston sealing grooves are all installed with piston seals 18 for sealing with the inner wall of the pneumatic head 1. During the movement, the upper piston 14 can abut against the gland step 131 for limiting position, and the middle piston 15 can abut against the end of the gland 13 for limiting position. Elastic parts 17 are provided between the gland 13 and the upper piston 14 and between the upper piston 14 and the middle piston 15. When the valve stem 4 is in the process of moving, the pressure of the two sets of elastic members 17 is increased, and the piston force value is increased, thereby effectively preventing the valve from being worn.

[0017] The diaphragm valve provided in the present embodiment also includes a valve body base 3, one end of the valve body base 3 is provided with a liquid inlet pipe hole 31, and the other end is provided with a liquid outlet pipe hole 32, the liquid inlet pipe hole 31 and the liquid outlet pipe hole 32 are separated by a partition 33, the liquid inlet pipe hole 31 and the liquid outlet pipe hole 32 are both connected to the fluid channel 34, a diaphragm 6 is fixed at the outlet of the liquid inlet pipe hole 31, a pressure block 5 is pressed on the diaphragm 6, the valve stem 4 is pressed on the pressure block 5 and can abut against the pressure block 5, the pressure block 5 is located in the step hole 112 of the pneumatic head base 11, one end of the valve stem 4 is pressed on the pressure block 5, and the other end extends into the pneumatic head body 12 When the air source is closed and there is no air in the pneumatic head 1, the valve stem 4 is pressed on the pressing block 5 under the action of the elastic member 17, and the pressing block 5 is pressed on the diaphragm 6, so that the diaphragm 6 blocks the outlet of the liquid inlet pipe hole 31. At this time, the liquid cannot enter the fluid channel 34, and no liquid flows out of the liquid outlet pipe hole 32, and the fluid is cut off; when the valve stem 4 moves and separates from the pressing block 5, the pressure on the diaphragm 6 is reduced. Under the pressure of the fluid, the diaphragm 6 bulges and lifts the pressing block 5, the outlet of the liquid inlet pipe hole 31 is opened, the liquid enters the fluid channel 34 and flows into the liquid outlet pipe hole 32 through the fluid channel 34, and the fluid is conducted; As a preferred embodiment of the present invention, the pneumatic head 1 can be installed on the valve body base 3 through the connecting piece 2 and can be rotated 360°. The connecting piece 2 has a vertical through hole 201 in the center, and has a first end 202 and a second end 203. The outer periphery of the first end 202 is cylindrical. The first end 202 is inserted into the valve body base 3 and can rotate in the valve body base 3. The outer periphery of the second end 203 is in the shape of a hexagonal nut, which is convenient for adjusting the direction of the pneumatic head 1 with the help of tools such as wrenches, so as to adapt to the needs of different installation sites. The pneumatic head base 11 is inserted into the vertical through hole 201 of the connecting piece 2, and the flange 111 abuts on the end face of the first end 202 of the connecting piece 2. The pneumatic head base 11 has a step hole 112 in the center, and the central axis of the step hole 112 coincides with the central axis of the vertical through hole 201.

[0018] The low-pressure driven and rotatable pneumatic head diaphragm valve of the present invention has a driving air source inlet 121 opened on the side of the pneumatic head 1, and the pneumatic head 1 can rotate 360° on the valve body base 3, can be installed in various installation occasions, and is used in various working conditions; a plurality of pistons are arranged in the pneumatic head 1, and elastic members 17 are arranged between the pistons and the pressure cover 13, and between the pistons. When the pneumatic valve is opened, it is necessary to resist the pressure of the two groups of elastic members 17 at the same time, thereby increasing the force value of the elastic members, balancing the superimposed pressure of the elastic members when the driving pressure remains unchanged, and preventing valve wear.

[0019] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. A person skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the present invention.

Claims

1. A low-pressure driven and rotatable pneumatic head diaphragm valve, comprising a pneumatic head (1), the pneumatic head (1) comprising a pneumatic head base (11), a pneumatic head body (12) and a gland (13), a side of the pneumatic head body (12) being provided with a driving air source inlet (121), an inner wall of the gland (13) also being provided with a gland step (131), the pneumatic head body (12) being connected to the pneumatic head base (11), and the gland (13) being arranged at one end of the pneumatic head body (12) away from the pneumatic head base (11); Features: An upper piston (14), a middle piston (15) and a lower piston (16) are also provided in the cavity of the pneumatic head (1). The upper piston (14) can abut against a gland step (131) to limit its position. The middle piston (15) is sleeved on the lower piston (16). The middle piston (15) can abut against an end of a gland (13) to limit its position. An elastic member (17) is provided between the gland (13) and the upper piston (14) and between the upper piston (14) and the middle piston (15).

2. The low-pressure driven and rotatable pneumatic head diaphragm valve according to claim 1, characterized in that: The valve body also comprises a valve body base (3), wherein a liquid inlet pipe hole (31) and a liquid outlet pipe hole (32) are provided in the valve body base (3), the liquid inlet pipe hole (31) and the liquid outlet pipe hole (32) are separated by a partition (33), the liquid inlet pipe hole (31) and the liquid outlet pipe hole (32) are both connected to a fluid channel (34), and the pneumatic head (1) can be mounted on the valve body base (3) via a connecting piece (2) so as to be rotatable 360 ​​degrees.

3. The low-pressure driven and rotatable pneumatic head diaphragm valve according to claim 2, characterized in that: The connecting piece (2) has a vertical through hole (201) at its center, and has a first end (202) and a second end (203). The first end (202) has a cylindrical outer circumference. The first end (202) is inserted into the valve body base (3) and can rotate within the valve body base (3). The second end (203) has a hexagonal nut outer circumference.

4. The low-pressure driven and rotatable pneumatic head diaphragm valve according to claim 3, characterized in that: One end of the pneumatic head base (11) has an outward flange (111), the pneumatic head base (11) is inserted into the vertical through hole (201) of the connecting piece (2), and the flange (111) abuts against the end surface of the first end (202) of the connecting piece (2), and the center of the pneumatic head base (11) has a step hole (112), and the central axis of the step hole (112) coincides with the central axis of the vertical through hole (201).

5. The low-pressure driven and rotatable pneumatic head diaphragm valve according to claim 4, characterized in that: It also includes a valve stem (4), a pressure block (5) and a diaphragm (6). The diaphragm (6) is fixed at the outlet of the liquid inlet pipe hole (31) and is used to open or close the fluid channel. The pressure block (5) is located in the step hole (112) of the pneumatic head base (11) and is pressed on the diaphragm (6). One end of the valve stem (4) is inserted into the step hole (112) of the pneumatic head base (11) and is pressed on the pressure block (5), and the other end is inserted into the cavity of the pneumatic head body (12). The upper piston (14) and the lower piston (16) are both sleeved on the valve stem (4).

6. The low-pressure driven and rotatable pneumatic head diaphragm valve according to claim 1, characterized in that: A sealing member installation groove (113) is provided on the outer wall of the pneumatic head base (11), a pneumatic head sealing member (114) is sleeved in the sealing member installation groove (113), and the pneumatic head body (12) and the pneumatic head base (11) are sealed via the pneumatic head sealing member (114).

7. The low-pressure driven and rotatable pneumatic head diaphragm valve according to claim 1, characterized in that: The upper piston (14), the middle piston (15) and the lower piston (16) are all provided with piston sealing grooves on their outer circumferences. Piston sealing members (18) are installed in the piston sealing grooves for sealing with the inner wall of the pneumatic head (1).

8. The low-pressure driven and rotatable pneumatic head diaphragm valve according to claim 1, characterized in that: The pneumatic head body (12) is also provided with a pneumatic head exhaust hole (122), and the pressure cover (13) is provided with a pressure cover exhaust hole (132).

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