CN211449784U

CN211449784U - Pressure reducing valve

Info

Publication number: CN211449784U
Application number: CN201921851528.4U
Authority: CN
Inventors: 孙光锋; 倪志升; 王伟; 蒋尚杰
Original assignee: Zhejiang EMc Pneumatic Technology Co ltd
Current assignee: Zhejiang EMc Pneumatic Technology Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-09-08
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a pressure reducing valve, which comprises a valve body and a valve cover arranged on the valve body; the valve body is provided with an air inlet and an air outlet, a valve port communicating the air inlet and the air outlet is arranged in the valve body, and a main pressure regulating cavity and an auxiliary pressure regulating cavity are also arranged in the valve body; a main diaphragm is arranged in the main pressure regulating cavity in a pressing manner, the main diaphragm divides the main pressure regulating cavity into an upper cavity and a lower cavity, a valve rod is fixed on the main diaphragm, and a valve core for controlling the opening and closing of a valve port is installed on the valve rod; the auxiliary pressure regulating cavity is internally provided with a first auxiliary diaphragm, a second auxiliary diaphragm and a diaphragm seat, the valve cover is provided with an operating rod, and the operating rod penetrates through the valve cover to be abutted and matched with the diaphragm seat; the upper chamber passes through air inlet channel and air inlet intercommunication, is equipped with the orifice in the air inlet channel, sets up the mounting hole that communicates air inlet channel on the valve body, and the mounting hole sets up between orifice and air inlet, and the mounting hole intussuseption is filled with the filter core, is equipped with the end cap that seals the mounting hole on the valve body. The utility model discloses possess simple structure, filter effect good, filter core change convenient advantage.

Description

Pressure reducing valve

Technical Field

The utility model relates to the technical field of valves, in particular to relief pressure valve.

Background

The pressure reducing valve is a valve which reduces the inlet pressure to a certain required outlet pressure through regulation and leads the outlet pressure to be automatically kept stable by relying on the energy of the medium. A conventional pressure reducing valve disclosed in chinese patent application No. CN97192853.3 includes a main body, a bonnet, an operating portion having a hand wheel, a first diaphragm, a second diaphragm, a third diaphragm, and a fourth diaphragm, all of which are disposed within the main body at a predetermined interval from each other, and a nozzle and a valve flap are disposed in a third diaphragm chamber; wherein a passage for communicating the primary side port with the nozzle back pressure chamber is formed in the main body part, a disk-shaped member having a small hole with a predetermined diameter formed in the central part is installed at a predetermined position of the passage, the function of throttling the pressure fluid is realized through the small hole, and a filter is installed at a position adjacent to the primary side port; in practical application, although the filter can block most impurities in gas on the outer side, the passage is relatively thin and long, the diameter of the small hole is extremely small, and after the filter is used for a long time, the small unfiltered impurities are accumulated at the small hole through the passage to block the small hole, so that the pressure reducing valve cannot work normally.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect and not enough, provide a relief pressure valve, it possesses simple structure, filter effect is good, and the filter core is changed convenient advantage.

The utility model provides a technical scheme that its technical problem adopted is: a pressure reducing valve comprises a valve body and a valve cover which is covered on the valve body; the valve body is provided with an air inlet and an air outlet, a valve port communicating the air inlet and the air outlet is arranged in the valve body, and a main pressure regulating cavity and an auxiliary pressure regulating cavity are also arranged in the valve body; a main diaphragm is arranged in the main pressure regulating cavity, the main diaphragm divides the main pressure regulating cavity into an upper cavity and a lower cavity, a valve rod is fixed on the main diaphragm, and a valve core for controlling the opening and closing of the valve port is installed on the valve rod; a first auxiliary diaphragm, a second auxiliary diaphragm and a diaphragm seat are arranged in the auxiliary pressure regulating cavity, the first auxiliary diaphragm and the second auxiliary diaphragm are arranged at intervals, the middle parts of the first auxiliary diaphragm and the second auxiliary diaphragm are both arranged on the diaphragm seat, the outer edges of the first auxiliary diaphragm and the second auxiliary diaphragm are arranged in the auxiliary pressure regulating cavity in a pressure-sharing manner, and the first auxiliary diaphragm, the second auxiliary diaphragm and the diaphragm seat are matched together to form an exhaust cavity and an auxiliary pressure regulating cavity; the valve cover is provided with an operating rod, and the operating rod penetrates through the valve cover to be abutted and matched with the diaphragm seat; the upper cavity is communicated with the air inlet through an air inlet flow channel, the lower cavity is communicated with the air outlet through an air outlet flow channel, the exhaust cavity is communicated with the upper cavity through a nozzle, a steel ball in sealing fit with the nozzle is installed at the bottom of the diaphragm seat, and the exhaust cavity is communicated with the atmosphere; the air inlet pipeline is characterized in that a throttling hole is formed in the air inlet pipeline, a mounting hole communicated with the air inlet pipeline is formed in the valve body, the mounting hole is formed between the throttling hole and the air inlet, a filter element is filled in the mounting hole, and a plug for sealing the mounting hole is arranged on the valve body.

Furthermore, still be equipped with first spring in the mounting hole, first spring support locate the filter core with between the bottom surface of mounting hole, the change of the filter core of being convenient for.

Furthermore, the plug is in sealing fit with the mounting hole through a threaded structure, and the sealing performance is improved.

Furthermore, the connecting part of the plug and the mounting hole is sleeved with an O-shaped ring, so that the sealing property is improved.

The utility model has the advantages that: the valve body is provided with the mounting hole communicated with the air inlet flow channel, the mounting hole is arranged between the throttling hole and the air inlet, and the filter element is filled in the mounting hole, so that the relative distance between the filter element and the throttling hole is shortened, the problem that the throttling hole is blocked due to the fact that impurities are retained in the air inlet flow channel is solved, and the filtering effect is improved; the plug for sealing the mounting hole is arranged on the valve body, the plug can be disassembled, the filter element can be directly replaced, and the pressure reducing valve does not need to be disassembled, so that the filter element is convenient to replace; generally, the utility model discloses possess simple structure, filter effect good, filter core change convenient advantage.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an enlarged schematic view at a in fig. 1.

Shown in the figure: 1-a valve body; 1.1-gas inlet; 1.2-gas outlet; 1.3-valve port; 1.4-upper chamber; 1.5-lower chamber; 1.6-exhaust chamber; 1.7-time pressure regulating cavity; 1.8-inlet flow channel; 1.9-air outlet flow channel; 1.10-orifice; 1.11-mounting holes; 2-valve cover; 3-a main membrane; 4-a valve stem; 5-valve core; 6-a first secondary diaphragm; 7-a second secondary membrane; 8-a diaphragm seat; 9-operating rod; 10-a nozzle; 11-steel balls; 12-a filter element; 13-plug; 14-a first spring; 15-O-ring; 16-a throttle valve cartridge; 17-a second spring; 18-a third spring; 19-fourth spring.

Detailed Description

For a more intuitive and complete understanding of the technical solution of the present invention, the following non-limiting characteristic description is now performed by combining the drawings of the present invention:

as shown in fig. 1 and 2, the pressure reducing valve comprises a valve body 1 and a valve cover 2 covering the valve body; the valve body 1 is provided with an air inlet 1.1 and an air outlet 1.2, the valve body 1 is internally provided with a valve port 1.3 for communicating the air inlet 1.1 with the air outlet 1.2, and the valve body 1 is internally provided with a main pressure regulating cavity and an auxiliary pressure regulating cavity; a main diaphragm 3 is arranged in the main pressure regulating cavity, the main diaphragm 3 divides the main pressure regulating cavity into an upper cavity 1.4 and a lower cavity 1.5, a valve rod 4 is fixed on the main diaphragm 3, and a valve core 5 for controlling the opening and closing of a valve port 1.3 is arranged on the valve rod 4; a first auxiliary diaphragm 6, a second auxiliary diaphragm 7 and a diaphragm seat 8 are arranged in the auxiliary pressure regulating cavity, the first auxiliary diaphragm 6 and the second auxiliary diaphragm 7 are arranged at intervals, the middles of the first auxiliary diaphragm 6 and the second auxiliary diaphragm 7 are both installed on the diaphragm seat 8, the outer edges of the first auxiliary diaphragm 6 and the second auxiliary diaphragm 7 are arranged in the auxiliary pressure regulating cavity in a pressure-sharing manner, and an exhaust cavity 1.6 and an auxiliary pressure regulating cavity 1.7 are formed by the first auxiliary diaphragm 6, the second auxiliary diaphragm 7 and the diaphragm seat 8 in a matched manner; the valve cover 2 is provided with an operating rod 9, and the operating rod 9 penetrates through the valve cover 2 to be abutted and matched with the diaphragm seat 8; the upper cavity 1.4 is communicated with the air inlet 1.1 through an air inlet flow passage 1.8, the lower cavity 1.5 is communicated with the air outlet 1.2 through an air outlet flow passage 1.9, the exhaust cavity 1.6 is communicated with the upper cavity 1.4 through a nozzle 10, a steel ball 11 which is in sealing fit with the nozzle 10 is arranged at the bottom of the diaphragm seat 8, and the exhaust cavity 1.6 is communicated with the atmosphere; a throttling hole 1.10 is formed in the air inlet flow channel 1.8, a mounting hole 1.11 communicated with the air inlet flow channel 1.8 is formed in the valve body 1, the mounting hole 1.11 is formed between the throttling hole 1.10 and the air inlet 1.1, a filter element 12 is filled in the mounting hole 1.11, and a plug 13 for sealing the mounting hole 1.11 is arranged on the valve body 1.

Preferably, a throttle valve core 16 is arranged between the flow channel communicated with the mounting hole 1.11 and the upper chamber 1.4, the throttle hole 1.10 is arranged on the throttle valve core 16, so that the throttle hole 1.10 can be conveniently processed, the upper end surface and the lower end surface of the throttle valve core 16 are respectively provided with an O-shaped ring 15 in a propping manner, the throttle valve core 16 can be conveniently mounted, and the relative sealing performance of the throttle hole 1.10 can be ensured.

Preferably, the filter element 12 adopts a filter element with a specification of 10um, so that a better filtering effect is kept; a filter screen (not shown) is arranged at the air inlet 1.1, so that the air is firstly subjected to primary prefiltering to basically remove impurities in the air, and the filtering effect is improved.

A first spring 14 is also arranged in the mounting hole 1.11, and the first spring 14 is abutted between the filter element 12 and the bottom surface of the mounting hole 1.11.

The plug 13 is in sealing fit with the mounting hole 1.11 through a threaded structure; an O-shaped ring 15 is sleeved at the joint of the plug 13 and the mounting hole 1.11.

When the filter element 12 is replaced, the plug 13 is screwed out, due to the elastic force of the first spring 14, the filter element 12 is ejected out while the plug 13 is screwed out, the filter element 12 is convenient to take out, a new filter element 12 is replaced, the filter element 12 is placed into the mounting hole 1.11, and finally the plug 13 is screwed.

Specifically, a second spring 17 is arranged between the operating rod 9 and the diaphragm seat 8 in a supporting manner, a third spring 18 is arranged between the diaphragm seat 8 and the side wall of the exhaust cavity 1.6 in a supporting manner, a fourth spring 19 is arranged between the main diaphragm 3 and the side wall of the lower cavity 1.5 in a supporting manner, and the springs are mainly used for overcoming the gas pressure, so that the diaphragms are guaranteed to be balanced, and the purpose of regulation and control is achieved.

The utility model discloses a theory of operation: the gas flows in from the gas inlet 1.1, the gas flow passes through the gas inlet flow channel 1.8, the mounting hole 1.11 and the throttle hole 1.10 in sequence, so that clean and clean gas stably flows into the upper chamber 1.4, enters the exhaust chamber 1.6 through the nozzle 10, and downwards through the control operation rod 9, so that the diaphragm seat 8 is pushed downwards, the pressure of the gas flowing out through the nozzle 10 is changed, meanwhile, the first auxiliary diaphragm 6 and the second auxiliary diaphragm 7 are deformed under stress, so that the gas in the exhaust chamber 1.6 and the secondary pressure regulating chamber 1.7 is changed, the back pressure of the main diaphragm 3 is moved downwards, the linkage valve rod 4 drives the valve core 5 to slide, so as to open the valve port 1.3, the gas at the gas inlet 1.1 flows to the gas outlet 1.2, part of the gas flows into the lower chamber 1.5 while the gas flows out from the gas outlet 1.2, an upward force is generated to act on the main diaphragm 3, and the back pressure and the upward thrust form a balance, so that the gas outlet 1, the precise pressure regulating effect is realized.

It should be noted that, the above-mentioned working principle may refer to a pressure reducing valve disclosed in chinese patent application No. CN97192853.3, and may also refer to a precise pressure regulating valve disclosed in chinese patent application No. CN201220520829.0, and the detailed working principle thereof is not repeated here.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims

1. A pressure reducing valve comprises a valve body (1) and a valve cover (2) covered on the valve body; the pressure regulating valve is characterized in that the valve body (1) is provided with an air inlet (1.1) and an air outlet (1.2), a valve port (1.3) communicating the air inlet (1.1) and the air outlet (1.2) is formed in the valve body (1), and a main pressure regulating cavity and an auxiliary pressure regulating cavity are further formed in the valve body (1); a main diaphragm (3) is arranged in the main pressure regulating cavity, the main diaphragm (3) divides the main pressure regulating cavity into an upper cavity (1.4) and a lower cavity (1.5), a valve rod (4) is fixed on the main diaphragm (3), and a valve core (5) for controlling the opening and closing of the valve port (1.3) is installed on the valve rod (4); a first auxiliary diaphragm (6), a second auxiliary diaphragm (7) and a diaphragm seat (8) are arranged in the auxiliary pressure regulating cavity, the first auxiliary diaphragm (6) and the second auxiliary diaphragm (7) are arranged at intervals, the middles of the first auxiliary diaphragm (6) and the second auxiliary diaphragm (7) are both installed on the diaphragm seat (8), the outer edges of the first auxiliary diaphragm (6) and the second auxiliary diaphragm (7) are arranged in the auxiliary pressure regulating cavity in a pressure-sharing manner, and an exhaust cavity (1.6) and an auxiliary pressure regulating cavity (1.7) are formed by the first auxiliary diaphragm (6), the second auxiliary diaphragm (7) and the diaphragm seat (8) in a matched mode;

an operating rod (9) is arranged on the valve cover (2), and the operating rod (9) penetrates through the valve cover (2) to be abutted and matched with the diaphragm seat (8);

the upper cavity (1.4) is communicated with the air inlet (1.1) through an air inlet flow passage (1.8), the lower cavity (1.5) is communicated with the air outlet (1.2) through an air outlet flow passage (1.9), the exhaust cavity (1.6) is communicated with the upper cavity (1.4) through a nozzle (10), a steel ball (11) which is in sealing fit with the nozzle (10) is installed at the bottom of the diaphragm seat (8), and the exhaust cavity (1.6) is communicated with the atmosphere;

the method is characterized in that: be equipped with orifice (1.10) in inlet channel (1.8), seted up on valve body (1) and communicate mounting hole (1.11) of inlet channel (1.8), mounting hole (1.11) set up in orifice (1.10) with between air inlet (1.1), the intussuseption of mounting hole (1.11) is filled with filter core (12), be equipped with on valve body (1) and seal end cap (13) of mounting hole (1.11).

2. The pressure reducing valve according to claim 1, wherein: still be equipped with first spring (14) in mounting hole (1.11), first spring (14) support locate filter core (12) with between the bottom surface of mounting hole (1.11).

3. The pressure reducing valve according to claim 1, wherein: the plug (13) is in sealing fit with the mounting hole (1.11) through a threaded structure.

4. The pressure reducing valve according to claim 3, wherein: and an O-shaped ring (15) is sleeved at the joint of the plug (13) and the mounting hole (1.11).