CN209309416U - A kind of pressure limiting valve - Google Patents

Abstract

The utility model discloses a pressure limiting valve, which comprises a valve body, one side of the valve body is provided with an air inlet, and the other side opposite to the air inlet is provided with an air outlet; the valve body is provided with a large piston and the small piston assembly located under the large piston, the intake valve port is formed between the small piston assembly and the valve body, the exhaust valve port is formed between the large piston and the small piston assembly, the large piston, small piston assembly and the valve body A chamber is formed between the three bodies, the air inlet is connected with the A chamber through the inlet valve port, and the air outlet is connected with the A chamber through the exhaust valve port; a balance spring is arranged above the large piston, and the balance spring The upper end is connected with the top wall of the valve body, the lower end is connected with the top of the large piston, and the lower part of the small piston assembly is provided with a return spring. The pressure limiting valve can ensure that the pressure in the pressure limiting valve is within a safe range through the air inlet and the air outlet, and is simpler in structure than the pressure limiting valve provided with the exhaust port.

Description

a pressure limiting valve

technical field

The utility model relates to a valve, in particular to a pressure limiting valve.

Background technique

The pressure limiting valve is a component that limits the pressure in a pipeline or equipment, and adjusts the pressure in the pipeline or equipment to maintain a constant range by increasing and decreasing the pressure. Existing pressure limiting valves include not only an air inlet and an air outlet, but also an exhaust port. When the pressure in the valve cavity is too high, the pressure in the valve cavity cannot be lowered in time simply by exhausting the air outlet. Vents are required to vent the air. However, the exhaust port is not used every time, and it will cause waste when it is not used.

Utility model content

In order to overcome the deficiencies of the above technologies, the utility model provides a pressure limiting valve, which can ensure that the pressure in the pressure limiting valve is within a safe range through the air inlet and the air outlet. The structure of the pressure limiting valve is simpler.

The technical solution adopted by the utility model to overcome its technical problems is:

A pressure limiting valve, comprising a valve body, one side of the valve body is provided with an air inlet, and the other side opposite to the air inlet is provided with an air outlet; the valve body is provided with a large piston and is located below the large piston. The small piston assembly, the intake valve port is formed between the small piston assembly and the valve body, the exhaust valve port is formed between the large piston and small piston assembly, and the large piston, small piston assembly and valve body are formed A cavity is formed, the air inlet is connected to the A cavity through the intake valve port, and the air outlet is connected to the A cavity through the exhaust valve port; a balance spring is arranged above the large piston, and the upper end of the balance spring is connected to the top of the valve body. The wall is connected, and the lower end is connected with the top of the large piston, and the lower part of the small piston assembly is sheathed with a return spring.

Further, the valve body includes an upper valve body and a lower valve body that are sealed and connected, the lower valve body includes an inner hole and an outer ring groove, the small piston assembly is arranged in the inner hole and the upper part extends out of the inner hole, The air inlet communicates with the inner hole, and the air outlet communicates with the outer ring groove.

Further, the connection between the lower valve body and the upper valve body is provided with a protrusion I for limiting the position of the large piston.

Further, the lower valve body is also provided with two protrusions.

Further, the small piston assembly includes a small piston body, a sealing sleeve disposed on the upper end of the small piston body, and a valve disposed in the middle of the small piston body.

Further, a guide seat is provided in the inner hole, and the part of the small piston assembly below the valve is provided in the guide seat, and the guide seat is used for guiding the small piston assembly.

Further, a spring seat is provided on the small piston body and below the valve, the return spring is sheathed on the guide seat, its upper end is connected to the spring seat, and its lower end is fixed on the guide seat.

Further, the upper end of the large piston is provided with a slot, and the upper valve body is provided with a guide channel matching the slot, and the balance spring is arranged in the slot, and the slot is used for balancing the balance spring. limit.

Further, the lower end of the lower valve body is provided with an exhaust seat assembly.

Further, a spring retaining ring is provided between the exhaust seat assembly and the lower valve body.

Further, in order to ensure tightness, a sealing ring 1 is provided between the upper valve body and the lower valve body, a sealing ring 2 is provided between the large piston and the upper valve body, and a sealing ring 3 is provided between the small piston body and the guide seat. , There is a sealing ring four between the guide seat and the lower valve body.

The beneficial effects of the utility model are:

The pressure limiting valve described in the utility model can ensure that the pressure in the pressure limiting valve is within a safe range through the air inlet and the air outlet, and is simpler in structure than the pressure limiting valve provided with an exhaust port.

Description of drawings

Fig. 1 is a schematic cross-sectional structural view of the pressure limiting valve in the initial state of the embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of the small piston assembly described in the embodiment of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of the pressure limiting valve in the working state of the embodiment of the utility model.

In the figure, 1, upper valve body, 1-1, guide channel, 2, lower valve body, 2-1, inner hole, 2-2, outer ring groove, 2-3, protrusion one, 2-4, protrusion two , 3, air inlet, 4, air outlet, 5, large piston, 5-1, slotting, 6, small piston assembly, 6-1, small piston body, 6-2, sealing sleeve, 6-3, Valve, 6-4, groove, 6-5, bump, 7, intake valve port, 8, exhaust valve port, 9, cavity A, 10, balance spring, 11, return spring, 12, guide seat , 13, spring seat, 14, exhaust seat assembly, 15, spring retaining ring, 16, sealing ring one, 17, sealing ring two, 18, sealing ring three, 19, sealing ring four.

Detailed ways

In order to facilitate those skilled in the art to better understand the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The following is only exemplary and does not limit the protection scope of the utility model.

As shown in Figure 1, a pressure limiting valve described in this embodiment includes a valve body, one side of the valve body is provided with an air inlet 3, and the other side opposite to the air inlet is provided with an air outlet 4 . The valve body is provided with a large piston 5 and a small piston assembly 6 located below the large piston, an air intake valve port 7 is formed between the small piston assembly 6 and the valve body, and a small piston assembly 6 is formed between the large piston 5 and the small piston assembly 6. The exhaust valve port 8, the large piston 5, the small piston assembly 6 and the valve body form an A chamber 9, the air inlet 3 communicates with the A chamber 9 through the air inlet valve port 7, and the air outlet 4 passes through the exhaust port. The gas valve port 8 communicates with the A cavity 9 . A balance spring 10 is provided above the large piston 5, the upper end of the balance spring 10 is connected to the top wall in the valve body, and the lower end is connected to the top of the large piston 5, and the lower part of the small piston assembly 6 is provided with a return spring 11 .

In this embodiment, the valve body includes an upper valve body 1 and a lower valve body 2 that are sealed and connected. In order to ensure the tightness between the upper valve body 1 and the lower valve body 2, the A sealing ring 16 is arranged between them, preferably an O-shaped sealing ring in this embodiment; the lower valve body 2 includes an inner hole 2-1 and an outer ring groove 2-2, and the small piston assembly 6 is arranged in the inner hole 2 -1 and the upper part extends out of the inner hole, the air inlet 3 communicates with the inner hole 2-1, and the air outlet 4 communicates with the outer ring groove 2-2. Further, the connection between the lower valve body 2 and the upper valve body is provided with a protrusion 2-3 for limiting the position of the large piston 5, so that the minimum of the large piston 5 is not lower than the protrusion 2 during the downward movement. -3 position; the lower valve body 2 is also provided with a protrusion 2-4.

In this embodiment, as shown in Figure 2, the small piston assembly 6 includes a small piston body 6-1, a sealing sleeve 6-2 arranged on the upper end of the small piston body and a valve 6-3 arranged in the middle of the small piston body , the sealing sleeve 6-2 is used to ensure the tightness of the exhaust valve port 8, and the contact and separation between the valve 6-3 and the protrusion 2-4 form the closing and opening of the intake valve port 7; correspondingly Specifically, the upper end of the small piston body 6-1 is provided with a groove 6-4 for fixing the sealing sleeve 6-1, and the middle part of the small piston body 6-1 is provided with a protrusion 6-5 for fixing the valve 6-3.

Further, a guide seat 12 is arranged in the inner hole 2-1, and the part of the small piston assembly below the valve 6-3 is arranged in the guide seat 12. A spring seat 13 is provided on the small piston body 6-1 and below the valve 6-3. The return spring 11 is sleeved on the guide seat 12 and its upper end is connected with the spring seat 13, and its lower end is fixed on the guide seat. 12 on.

Further, the upper end of the large piston 5 is provided with a slot 5-1, and the upper valve body 1 is provided with a guide passage 1-1 matching the slot, and the balance spring 10 is arranged in the slot 5-1. 1, the slot 5-1 is used to limit the balance spring 10.

Preferably, the lower end of the lower valve body 2 is provided with an exhaust seat assembly 14 ; furthermore, a spring retaining ring 15 is provided between the exhaust seat assembly 14 and the lower valve body 2 .

In order to ensure tightness, a seal ring 2 17 is provided between the large piston 5 and the upper valve body 1, a seal ring 3 18 is provided between the small piston body 6-1 and the guide seat 12, and a seal ring 3 18 is provided between the guide seat 12 and the lower valve body 2. Sealing ring 4 19 is arranged between, and in the present embodiment, described sealing ring 2 17, sealing ring 3 18 and sealing ring 4 19 all adopt O-shaped sealing ring.

The working principle of the pressure limiting valve described in this embodiment:

Initial state: as shown in Figure 1, under the action of the spring force of the balance spring 10, the large piston 5 is pushed down, so that the large piston 5 contacts the small piston assembly 6, the exhaust valve port 8 is closed, and the small piston is pushed The assembly 6 moves down against the spring force of the return spring 11 to open the intake valve port 7 .

Working state: As shown in Figure 3, when the compressed air enters the A chamber 9 from the air inlet 3 and the air exits from the air outlet 4, the compressed air in the A chamber 9 acts on the lower surface of the large piston 5 at the same time. The reaction force on the lower surface of the large piston 5 also rises accordingly, and cooperates with the spring force of the return spring 11 to overcome the spring force of the balance spring 10, pushing the large piston 5 and the small piston assembly 6 to move upward, closing the intake valve port 7. Cut off the compressed air entering the air inlet 1, and the reaction force on the lower surface of the large piston 5 decreases with the consumption of the air from the air outlet 4. At this time, when the force is lower than the spring force of the balance spring 10, the large piston 5 and the The small piston assembly 6 moves down under the spring force of the balance spring 10, thereby opening the intake valve port 7, and the compressed air in the A cavity 9 is replenished. When a certain pressure value is reached, the lower surface of the large piston 5 reacts Force cooperates the spring force of return spring 11 to overcome the spring force of balance spring 10 again, promotes big piston 5 and little piston assembly 6 and moves up, closes intake valve port 7. So back and forth work.

The above only describes the basic principle and preferred implementation of the present utility model, and those skilled in the art can make many changes and improvements according to the above description, and these changes and improvements should belong to the protection scope of the present utility model.

Claims (10)

1. a kind of pressure limiting valve, including valve body, which is characterized in that the side of the valve body is equipped with air inlet (3), opposite with air inlet The other side be equipped with gas outlet (4)；Big piston (5) and the small piston assembly (6) below big piston are equipped in the valve body, Intake valve port (7) are formed between small piston assembly (6) and valve body, form exhaust valve between big piston (5) and small piston assembly (6) Mouth (8), forms A chamber (9) between big piston (5), small piston assembly (6) and valve body three, and the air inlet (3) passes through intake valve Mouth (7) is connected to A chamber (9), and gas outlet (4) are connected to by exhaust valve port (8) with A chamber (9)；It is set above the big piston (5) Having balancing spring (10), the upper end of balancing spring (10) is connect with valve body inner roof wall, lower end is connect with the top of big piston (5), The lower part of the small piston assembly (6) is arranged with return spring (11).

2. pressure limiting valve according to claim 1, which is characterized in that the valve body include be tightly connected upper valve body (1) and Lower valve body (2), the lower valve body (2) include inner hole (2-1) and outer groove (2-2), and the small piston assembly (6) is set to inner hole In (2-1) and inner hole is extended on top, and the air inlet (3) is connected to inner hole (2-1), and gas outlet (4) and outer groove (2-2) connect It is logical.

3. pressure limiting valve according to claim 2, which is characterized in that on the lower valve body (2) and the junction with upper valve body Equipped with for the protrusion one (2-3) to big piston limit.

4. pressure limiting valve according to claim 2 or 3, which is characterized in that be additionally provided with two (2- of protrusion on the lower valve body (2) 4).

5. pressure limiting valve according to claim 4, which is characterized in that the small piston assembly (6) includes small piston ontology (6- 1) valve (6-3) for, being set to the sealing shroud (6-2) of small piston ontology upper end and being set in the middle part of small piston ontology.

6. pressure limiting valve according to claim 5, which is characterized in that guide holder (12) are equipped in the inner hole (2-1), it is described Small piston assembly is located at the part below valve (6-3) and is set in guide holder (12).

7. pressure limiting valve according to claim 6, which is characterized in that on the small piston ontology (6-1) and be located at valve (6- 3) lower section is equipped with spring base (13), and the return spring (11) is sheathed on guide holder (12) and the upper end and spring base (13) Connection, lower end are fixed on guide holder (12).

8. according to pressure limiting valve described in Claims 2 or 3 or 5 or 6 or 7, which is characterized in that the upper end of the big piston (5) is set Have fluting (5-1), the guide channel (1-1) to match with fluting is equipped in the upper valve body (1), the balancing spring (10) sets It is placed in fluting (5-1).

9. pressure limiting valve according to claim 8, which is characterized in that the lower end of the lower valve body (2) is equipped with exhaust seat assembly (14), it is vented between seat assembly (14) and lower valve body (2) and is equipped with check ring (15).

10. pressure limiting valve according to claim 6 or 7, which is characterized in that be equipped between upper valve body (1) and lower valve body (2) close Seal one (16) is equipped with sealing ring two (17), small piston ontology (6-1) and guide holder between big piston (5) and upper valve body (1) (12) it is equipped with sealing ring three (18) between, sealing ring four (19) is equipped between guide holder (12) and lower valve body (2).