Pneumatic guard valve

Abstract

The utility model discloses a pneumatic guard valve which is characterized by comprising a valve base, an upper cover installed on the valve base, an exhaust ring installed between the upper cover and the valve base, a diaphragm installed between the exhaust ring and the upper cover and between the exhaust ring and the valve base, and a valve rod installed on the diaphragm. The exhaust ring is provided with a plurality of pre-positioning sheets which can be quickly mounted between the upper cover and the valve base in a pre-positioning manner; the upper cover and the valve base are provided with pre-positioning grooves matched with the positioning pieces. According to the utility model, the pre-positioning sheets on the exhaust ring are respectively arranged in the pre-positioning grooves on the upper cover and the valve base, so that the exhaust ring, the upper cover and the valve base are overlapped, positioned and installed, and the overlapped, positioned and installed among the exhaust ring, the upper cover and the valve base are facilitated, and the installation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatic protection valve. Background Art

[0002] The protection valve, also known as the air lock valve, is used in pneumatic actuators to prevent equipment malfunctions caused by unexpected low air pressure, so that the actuator can lock the position before the air pressure drops when the air pressure drops to ensure safety. In the existing technology, the base, exhaust ring and upper cover on the protection valve are stacked and installed, and screws are passed through the upper cover, the exhaust ring and the base in sequence to connect them, so as to fix the base, the exhaust ring and the upper cover. However, during the installation of the base, the exhaust ring and the upper cover, the screw holes on the base, the exhaust ring and the upper cover need to be manually aligned to facilitate the subsequent installation of the screws. It is not possible to stack and install them randomly, which increases the installation time and reduces the installation efficiency. For this reason, a pneumatic protection valve that can improve the installation efficiency is proposed. Summary of the invention

[0003] The utility model aims to solve the above problems and provides a pneumatic protection valve.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pneumatic protection valve, which is characterized by including a valve base, an upper cover installed on the valve base, an exhaust ring installed between the upper cover and the valve base, a diaphragm installed between the exhaust ring, the upper cover and the valve base, and a valve stem installed on the diaphragm; the exhaust ring is provided with a plurality of pre-positioning pieces that can be quickly pre-positioned and installed between the upper cover and the valve base; the upper cover and the valve base are provided with pre-positioning grooves that are adapted to the positioning pieces.

[0005] Preferably, the diaphragm comprises an upper mold plate installed between the upper cover and the exhaust ring and a lower diaphragm installed between the valve base and the exhaust ring; the valve stem is fixed on the lower diaphragm.

[0006] Preferably, a valve core located inside the valve base is also mounted on the valve stem.

[0007] Preferably, a plug is installed on the valve base; and a return spring is installed between the plug and the valve core.

[0008] Preferably, the plug block is also provided with a sliding guide groove adapted to the valve core.

[0009] Preferably, an adjusting screw is installed in the upper cover; an upper spring seat is installed on the adjusting screw; and a lower spring seat corresponding to the upper spring seat is installed on the upper mold piece.

[0010] Preferably, a spring is installed between the upper spring seat and the lower spring seat.

[0011] Preferably, an upper top plate and an adjusting nut for limiting the position of the upper top plate and adjusting the adjusting screw are also installed on the adjusting screw.

[0012] Preferably, a panel and a locking nut for fixing the panel are also installed on the upper top plate.

[0013] The beneficial effects of the utility model are as follows: by utilizing the pre-positioning pieces on the exhaust ring to be respectively installed in the pre-positioning grooves on the upper cover and the valve base, the exhaust ring, the upper cover and the valve base are overlapped and positioned for installation, thereby facilitating the overlapped and positioned installation of the exhaust ring, the upper cover and the valve base and improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 This utility model Figure 1 A partial enlarged view of point A in the middle.

[0016] Figure 3 It is a side view of the utility model.

[0017] Legend: 1. Valve base; 101. Pre-positioning groove; 102. Plug; 103. Return spring; 104. Sliding guide groove; 2. Upper cover; 201. Adjusting screw; 202. Upper spring seat; 203. Lower spring seat; 204. Spring; 205. Upper top plate; 206. Adjusting nut; 207. Panel; 208. Locking nut; 3. Exhaust ring; 301. Pre-positioning plate; 4. Valve stem; 401. Valve core; 5. Upper mold plate; 501. Lower diaphragm. DETAILED DESCRIPTION

[0018] Below we further explain the pneumatic protection valve described in the utility model in conjunction with the accompanying drawings.

[0019] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the utility model are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Participate in the Figure 1-3 As shown, in this embodiment, a pneumatic protection valve is characterized by including a valve base 1, an upper cover 2 installed on the valve base 1 by screws, an exhaust ring 3 installed between the upper cover 2 and the valve base 1 by screws, a diaphragm installed between the exhaust ring 3, the upper cover 2 and the valve base 1, and a valve stem 4 installed on the diaphragm; the exhaust ring 3 is provided with a plurality of pre-positioning pieces 301 that can be quickly pre-positioned and installed between the upper cover 2 and the valve base 1; the upper cover 2 and the valve base 1 are provided with pre-positioning grooves 101 adapted to the positioning pieces; the pre-positioning pieces 301 on the exhaust ring 3 are respectively installed in the pre-positioning grooves 101 on the upper cover 2 and the valve base 1, so that the exhaust ring 3 is overlapped and positioned with the upper cover 2 and the valve base 1, thereby facilitating the overlapped and positioned installation between the exhaust ring 3, the upper cover 2 and the valve base 1, and improving the installation efficiency.

[0022] See attached Figure 1 As shown, the diaphragm includes an upper mold piece 5 installed between the upper cover 2 and the exhaust ring 3 and a lower diaphragm 501 installed between the valve base 1 and the exhaust ring 3; the valve stem 4 is fixed on the lower diaphragm 501; the valve stem 4 is also installed with a valve core 401 located inside the valve base 1; a plug 102 is also installed on the valve base 1 through a thread; a return spring 103 is installed between the plug 102 and the valve core 401; the plug 102 is also provided with a sliding guide groove 104 adapted to the valve core 401; the sliding guide groove 104 is used to guide the movement of the valve core 401, thereby facilitating the guidance of the valve core 401; the return spring 103 is used to push the valve core 401 to move when the signal air pressure is lower than the set pressure, so as to cut off the pneumatic circuit and automatically close the valve.

[0023] See attached Figure 1As shown, an adjusting screw 201 is also installed in the upper cover 2; an upper spring seat 202 is installed on the adjusting screw 201; a lower spring seat 203 corresponding to the upper spring seat 202 is installed on the upper mold piece 5; a spring 204 is installed between the upper spring seat 202 and the lower spring seat 203; an upper top plate 205 and an adjusting nut 206 for limiting the upper top plate 205 and adjusting the adjusting screw 201 are also installed on the adjusting screw 201; a panel 207 and a locking nut 208 for fixing the panel 207 are also installed on the upper top plate 205.

[0024] In the working process of the utility model, the signal air enters the bottom of the upper diaphragm through the exhaust exchanger. When the air pressure of the signal air is greater than the set pressure of the spring 204, the upper diaphragm is pushed to move upward to compress the spring 204. At the same time, the signal air pressure enters the top of the lower die, pushing the lower die to move downward. The lower die drives the valve stem 4 to move downward. The valve stem 4 unwinds the valve core 401 and moves downward along the sliding guide groove 104 to compress the reset unit to open the valve. When the signal air pressure is lower than the set pressure of the spring 204, the spring 204 uses its own elasticity to push the upper diaphragm downward to reset. At the same time, the reset spring 103 uses its elasticity to push the valve core 401 upward to reset, so that the valve is closed.

[0025] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A pneumatic protection valve, characterized in that it comprises a valve base (1), an upper cover (2) mounted on the valve base (1), an exhaust ring (3) mounted between the upper cover (2) and the valve base (1), a diaphragm mounted between the exhaust ring (3) and the upper cover (2) and the valve base (1), and a valve stem (4) mounted on the diaphragm; the exhaust ring (3) is provided with a plurality of pre-positioning pieces (301) that can be quickly pre-positioned and installed between the upper cover (2) and the valve base (1); the upper cover (2) and the valve base (1) are provided with pre-positioning grooves (101) that are adapted to the positioning pieces.

2. A pneumatic protection valve according to claim 1, characterized in that: The diaphragm comprises an upper mold plate (5) installed between an upper cover (2) and an exhaust ring (3), and a lower diaphragm (501) installed between a valve base (1) and an exhaust ring (3); the valve stem (4) is fixed on the lower diaphragm (501).

3. A pneumatic protection valve according to claim 1, characterized in that: The valve stem (4) is also provided with a valve core (401) located inside the valve base (1).

4. A pneumatic protection valve according to claim 3, characterized in that: A plug block (102) is also installed on the valve base (1); and a return spring (103) is installed between the plug block (102) and the valve core (401).

5. A pneumatic protection valve according to claim 4, characterized in that: The plug block (102) is also provided with a sliding guide groove (104) adapted to the valve core (401).

6. A pneumatic protection valve according to claim 2, characterized in that: An adjusting screw (201) is also installed in the upper cover (2); an upper spring seat (202) is installed on the adjusting screw (201); and a lower spring seat (203) installed corresponding to the upper spring seat (202) is installed on the upper mold plate (5).

7. A pneumatic protection valve according to claim 6, characterized in that: A spring (204) is installed between the upper spring seat (202) and the lower spring seat (203).

8. The pneumatic protection valve according to claim 6, characterized in that: The adjusting screw rod (201) is also provided with an upper top plate (205) and an adjusting nut (206) for limiting the position of the upper top plate (205) and adjusting the adjusting screw rod (201).

9. A pneumatic protection valve according to claim 8, characterized in that: A panel (207) and a locking nut (208) for fixing the panel (207) are also mounted on the upper top plate (205).

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