CN218326357U

CN218326357U - Three-way automatic air-exhaust check valve

Info

Publication number: CN218326357U
Application number: CN202222525065.0U
Authority: CN
Inventors: 陈卫平; 陈立龙
Original assignee: Hangzhou Worldwise Valve Co ltd
Current assignee: Hangzhou Worldwise Valve Co ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-01-17
Anticipated expiration: 2032-09-23

Abstract

The utility model provides a three-way automatic empty-discharge check valve, which mainly comprises a lower valve cover, a flow guide sleeve, a valve body, a valve seat, a valve clack, a guide rod, a guide sleeve, a valve rod and an upper valve cover; the valve body comprises an inlet cavity, an outlet cavity and an empty discharge cavity and forms a three-way full-flow flange connection structure; the valve clack is fixedly connected with the flow guide sleeve, one end of the guide rod is inserted in the flow guide sleeve, the other end of the guide rod is inserted in the guide sleeve, the flow guide sleeve is provided with a through hole A and is connected in the flow guide seat in a sliding manner, and the flow guide seat is provided with a through hole B and is arranged on the valve body at the communication position of the inlet cavity and the air exhaust cavity. The utility model discloses profitable effect: the through hole A (flow passage hole) on the flow guide sleeve is in a small hole type, and the medium uniformly flows around, so that the pressure of the medium is reduced, and the noise is reduced; the guide sleeve and the valve clack are assembled into a whole, so that when the valve clack is closed, the guide sleeve is communicated with the through hole A and the through hole B, namely, the guide sleeve can be synchronously opened in time, the water pump is ensured not to be overpressured, and the safe operation of the water pump is ensured.

Description

Three-way automatic air-exhaust check valve

Technical Field

The utility model relates to an empty check valve field mainly is an automatic empty check valve that arranges of tee bend.

Background

With the continuous development of the power generation industry, the unit parameters are higher and higher, and various high-pressure large-capacity water pumps matched with the unit are widely applied. In order to protect the safety performance of the water pump, the water supply backflow of the water pump needs to be prevented at first, and accidents are avoided. Therefore, in the pipeline design, the outlet of the water pump is necessarily provided with a check valve. The particularity that the check valve can meet the use working condition of the high-pressure high-capacity water pump in technical requirements and structural design is of great importance. When the use parameters of the outlet pipeline of the water pump are changed or the valve is closed, the overpressure operation of the water pump is caused, the water pump is damaged finally, and the safe operation of the whole system is influenced.

When the traditional check valve is in a low-load state or an outlet valve is closed, because no empty discharge structure exists, water pump overpressure and pipeline overload can be generated, and the water pump and a pipeline system cannot be protected. The other air exhaust structure is mostly of a shifting fork type structure, for example, chinese patent CN 2077700U previously applied by the company discloses an air exhaust check valve which mainly comprises a valve body, a lining, a shifting fork, a spring, a positioning sleeve, a positioning wheel, a movable valve core, a pin shaft, a sliding block, an exhaust sleeve, a connecting flange, a sealing gasket, an air exhaust disc and an air exhaust flange, wherein the lining is installed at the center of an internal channel on the right side of the valve body, the middle of the lining penetrates through the front end of the movable valve core, the middle part of the movable valve core is connected with one end of the shifting fork, the spring is installed in the middle of the tail part of the movable valve core, the positioning sleeve is installed behind the spring, the positioning wheel is installed at the leftmost end of the internal channel of the valve body, the middle part of the shifting fork is installed on the valve body through the pin shaft, the other end of the shifting fork is connected with the sliding block, the sliding block is matched with the lower surface of the exhaust sleeve, the connecting flange is installed at the top of the valve body, the air exhaust flange is installed with the air exhaust flange, multiple layers of the air exhaust discs, and the sealing gasket is clamped between the air exhaust discs. The working principle is as follows: the idle discharge switch is realized by the action of a shifting fork, if the actions of the parts are failed, the idle discharge cannot work, so that the overvoltage protection cannot be ensured, and the following problems mainly exist: (1) The shifting fork rod and the main shaft hinge structure are connected to form a certain gap, a dead zone can be generated in the action process, and the action is asynchronous and the timeliness is insufficient; (2) The shifting fork is slender, the rigidity cannot be ensured, and the deformation is easy to generate; (3) The tail end of the shifting fork and the seal of the empty discharge outlet end have unreliability, and if the position is not up to a point after action, leakage is easy to generate; (4) The pretightening force of the spring can not be adjusted, and the pressure change working condition can not be adapted.

SUMMERY OF THE UTILITY MODEL

In order to guarantee the operation of the safety and stability of high pressure large capacity water pump system, the utility model provides an automatic empty check valve of arranging of tee bend.

The purpose of the utility model is accomplished through following technical scheme. A three-way automatic air-discharge check valve mainly comprises a lower valve cover, a guide sleeve, a valve body, a valve seat, a valve clack, a guide rod, a guide sleeve, a valve rod and an upper valve cover; the valve body comprises an inlet cavity, an outlet cavity and an air exhaust cavity and forms a three-way full-flow flange connection structure, and an upper valve cover and a lower valve cover are fixedly connected to the valve body;

the valve seat is fixedly connected to the inner wall of the valve body and arranged at the communication position of the inlet cavity and the outlet cavity, and the valve clack is connected to the valve seat in a matched mode to form a plane sealing structure;

the valve clack is fixedly connected with the flow guide sleeve, one end of the guide rod is inserted into the flow guide sleeve, the flow guide sleeve is provided with a through hole A and is connected in the flow guide seat in a sliding manner, the flow guide seat is provided with a through hole B and is arranged on the valve body at the communication part of the inlet cavity and the empty exhaust cavity, and the axis of the empty exhaust cavity and the axis of the inlet cavity are positioned on the same horizontal plane; the other end of the guide rod is inserted into the guide sleeve, a spring is arranged between the guide sleeve and the valve clack, and a certain limit distance is reserved between the bottom of the guide sleeve and a spring seat on the valve clack;

when the valve clack is in a closed state, the through hole A is communicated with the through hole B, so that the inlet cavity is communicated with the empty discharge cavity; when the valve clack is in an opening state, the inlet cavity is communicated with the outlet cavity, the through hole A on the flow guide sleeve synchronously moves upwards along with the valve clack, and the positions of the through hole A and the through hole B are staggered to form a relative closing state.

Furthermore, the empty discharge cavity is provided with a group of throttle orifice plates, the diameter and the number of the throttle orifices of each throttle orifice plate are gradually increased along the outlet direction of the empty discharge cavity, and a protective sleeve is arranged between the adjacent throttle orifice plates and is matched and connected with the inner wall of the empty discharge cavity.

Furthermore, a sealing ring D is arranged at the matching position of the flow guide seat and the valve body to form a first seal, a pressing plate, an elastic sealing ring and a pressing ring are sleeved on the flow guide seat, a right-angle sealing block is arranged between the pressing plate and the elastic sealing ring, and the pressing ring is in threaded connection with the flow guide seat, so that the pressing plate is tightly pressed on the valve body to form a second seal.

Furthermore, the lower valve cover is in threaded connection with the valve body, and a sealing ring A is arranged between the lower valve cover and the valve body; the upper valve cover is connected to the valve body in a threaded mode, and a sealing ring C is arranged between the upper valve cover and the valve body.

Furthermore, the valve seat is fixedly connected to the valve body through a screw A, the valve clack is fixedly connected with the flow guide sleeve through a screw B, and a sealing ring B is arranged at the matching position of the valve clack and the valve body.

Furthermore, a valve rod is arranged in the upper valve cover, one end of the valve rod is connected with the guide sleeve, and the other end of the valve rod is connected with an adjusting nut to form a spring adjusting device.

Furthermore, the upper valve cap is fixedly connected with a connecting block, and the connecting block is fixedly connected with the valve cap.

The beneficial effects of the utility model are that:

1. the valve clack and the valve seat are in a plane sealing structure form. The seal pair is provided with a hardness difference of 3-5 HRC by overlaying STL hard alloy, so that the scouring resistance and the valve sealing performance are improved, and the service life is prolonged.

2. A through hole A (a runner hole) on the flow guide sleeve for the air exhaust is in a small hole type, and the medium uniformly flows around, so that the pressure of the medium is reduced, and the noise is reduced; the guide sleeve and the valve clack are assembled into a whole, so that when the valve clack is closed, the guide sleeve is communicated with the through hole A and the through hole B, namely, the guide sleeve can be synchronously opened in time, the water pump is ensured not to be overpressured, and the safe operation of the water pump is ensured. Meanwhile, the empty discharge outlet flow passage is arranged in the inlet cavity and on a horizontal plane so as to directly discharge the air and reduce the geometric length and vibration of the flow passage.

3. The upper and lower valve covers and the valve body are sealed by O-shaped sealing rings, so that the size of the sealing structure is reduced, and materials are saved.

4. The empty discharge outlet cavity is provided with a plurality of gradually-increased throttling orifice plates, so that the outlet pressure is reduced, the safe discharge is ensured, and the noise is further reduced. And a protective sleeve is added at the position of the adjacent throttle orifice plate, so that the flushing of the medium on the inner surface of the valve body casting during the emptying process is avoided.

5. The spring pretightening force adjusting device is arranged, so that the pretightening force of the spring can be adjusted, and the working conditions of different medium pressures can be met.

6. The guide sleeve is designed to ensure that the spring does not bend and deform during action, so that the use reliability is improved, and meanwhile, the bottom of the guide sleeve also plays a role in limiting the valve clack.

7. The valve seat is detachable, so that the valve is convenient to use and maintain.

8. The seal of water conservancy diversion seat and valve body adopts twice to seal, and the first way is that O type circle is sealed, secondly adopts right angle connecting block to compress tightly sealed, further improves sealing performance.

Drawings

Fig. 1 is a schematic view of the main-view section structure of the present invention.

Fig. 2 is a schematic left-side sectional view of the present invention.

Fig. 3 is a partially enlarged schematic view of the guide sleeve blank of fig. 2.

Description of reference numerals: the valve comprises a lower valve cover 1, a sealing ring A2, a flow guide sleeve 3, a through hole A3-1, a valve body 4, an inlet cavity 4-1, an outlet cavity 4-2, an air exhaust cavity 4-3, a pressing ring 5, an elastic sealing ring 6, a right-angle sealing block 7, a pressing plate 8, a flow guide seat 9, a through hole B9-1, a screw A10, a sealing ring B11, a valve seat 12, a valve clack 13, a guide rod 14, a spring 15, a guide sleeve 16, a valve rod 17, a connecting block 18, an adjusting nut 19, a valve cap 20, an upper valve cover 21, a protective sleeve 22, a throttle orifice plate 23, a screw B24, a sealing ring C25 and a sealing ring D26.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the present invention, the embodiments or technical features described below may be arbitrarily combined to form a new embodiment without conflict.

As shown in fig. 1-2, the utility model provides a three-way automatic air-discharge check valve, which mainly comprises a lower valve cover 1, a diversion sleeve 3, a valve body 4, a valve seat 12, a valve clack 13, a guide rod 14, a guide sleeve 16, a valve rod 17 and an upper valve cover 21, in order to ensure the safe operation of a water pump and the stability of a system pipeline; the valve body 4 comprises an inlet cavity 4-1, an outlet cavity 4-2 and an empty discharge cavity 4-3 and forms a three-way full-flow flange connection structure, and an upper valve cover 21 and a lower valve cover 1 are fixedly connected to the valve body 4; specifically, the lower valve cover 1 is in threaded connection with the valve body 4, and a sealing ring A2 is arranged between the lower valve cover 1 and the valve body 4; the upper valve cover 21 is in threaded connection with the valve body 4, and a sealing ring C25 is arranged between the upper valve cover 21 and the valve body 4; the upper and lower valve covers and the valve body are sealed by O-shaped rings, so that the size of the sealing structure is reduced, and materials are saved.

The valve seat 12 is fixedly connected to the inner wall of the valve body 4 and is arranged at the communication part of the inlet cavity 4-1 and the outlet cavity 4-2, and the valve clack 13 is connected to the valve seat 12 in a matching way to form a plane sealing structure; the seal pair is constructed by overlaying STL hard alloy, the hardness difference of the seal pair is 3-5 HRC, the scouring resistance and the valve sealing performance are improved, and the service life is prolonged.

The valve clack 13 is fixedly connected with the flow guide sleeve 3, one end of the guide rod 14 is inserted into the flow guide sleeve 3 and is fixedly connected with the flow guide sleeve 3, the flow guide sleeve 3 is provided with a through hole A3-1 (a flow channel hole) and is connected in the flow guide seat 9 in a sliding manner, the flow channel hole of the flow guide sleeve is in a small hole type, the medium uniformly flows around, the pressure of the medium is reduced, and meanwhile, the noise is reduced. The guide seat 9 is provided with a through hole B9-1 and is arranged on the valve body 4 at the communication part of the inlet cavity 4-1 and the empty discharge cavity 4-3, and the axis of the empty discharge cavity 4-3 and the axis of the inlet cavity 4-1 are positioned on the same horizontal plane; the other end of the guide rod 14 is inserted into the guide sleeve 16 and is connected with the guide sleeve in a sliding manner, a spring 15 is sleeved on the outer diameter between the guide sleeve 16 and the spring seat of the valve clack 13, the guide sleeve is designed to ensure that the spring does not bend and deform during action and improve the use reliability, a certain limiting distance is reserved between the bottom of the guide sleeve 16 and the spring seat on the valve clack 13, and the bottom of the guide sleeve 16 also plays a role of limiting the valve clack 13 (namely limiting the upward movement distance of the valve clack 13). The valve rod 17 is arranged in the upper valve cover 21, the connecting block 18 is fixedly connected to the upper valve cover 21, the connecting block 18 is fixedly connected with the valve cap 20, one end of the valve rod 17 is connected with the guide sleeve 16, the other end of the valve rod 17 is connected with the adjusting nut 19 to form a spring adjusting device, and the spring pre-tightening force adjusting device can adjust pre-tightening force of a spring and can meet the use requirements of working conditions with different medium pressures.

When the valve clack 13 is in a closed state, the guide sleeve and the valve clack are assembled into a whole, so that when the valve clack is closed, the through hole A3-1 on the guide sleeve is communicated with the through hole B9-1, namely, the guide sleeve can be timely and synchronously opened, and the inlet cavity 4-1 is communicated with the empty discharge cavity 4-3;

when the valve clack 13 is in an opening state, upward thrust is generated on the valve clack 13, the pretightening force of the spring 15 is overcome, the valve clack 4 is opened, the inlet cavity 4-1 is communicated with the outlet cavity 4-2, the valve clack 13 and the flow guide sleeve 3 are assembled into a fixed integral body, the guide rod 14, the flow guide sleeve 3 and the valve clack 13 move upwards together, the guide rod 14 slides upwards in the guide sleeve 16, the through hole A3-1 on the flow guide sleeve 3 synchronously moves upwards along with the valve clack 13, and the positions of the through hole A3-1 and the through hole B9-1 are staggered to form a relative closing state.

The empty discharge cavity 4-3 is provided with three throttle orifice plates 23, the diameter of each throttle orifice plate 23 and the number of throttle orifices are gradually increased along the outlet direction of the empty discharge cavity 4-3, the outlet pressure is reduced, so that safe discharge is ensured, and meanwhile, the noise is further reduced. And a protective sleeve 22 is arranged between the adjacent throttle orifice plates 23 and is matched and connected with the inner wall of the empty discharge cavity 4-3, so that the inner surface of the valve body casting is prevented from being washed by the medium during empty discharge.

As shown in fig. 3, the matching position of the diversion seat 9 and the valve body 4 is provided with a sealing ring D26 to form a first seal, the diversion seat 9 is sleeved with a pressing plate 8, an elastic sealing ring 6 and a pressing ring 5, a right-angle sealing block 7 is arranged between the pressing plate 8 and the elastic sealing ring 6, and the pressing ring 5 is in threaded connection with the diversion seat 9, so that the pressing plate 8 is tightly pressed on the valve body 4 to form a second seal, and the sealing performance is further improved.

The valve seat 12 is fixedly connected to the valve body 4 through a screw A10, and the valve seat is detachable, so that the valve is convenient to use and maintain. The valve clack 13 is fixedly connected with the flow guide sleeve 3 through a screw B24, and a sealing ring B11 is arranged at the matching position of the valve clack 13 and the valve body 4.

The working principle is as follows: the water medium at the outlet of the water pump enters an inlet cavity 4-1 of the three-way automatic air-discharge check valve, upward thrust is generated on the valve clack 13, the pretightening force of the spring 15 is overcome, the valve clack 4 is opened, and the medium flows from an outlet cavity 4-2 of the valve to the direction of a process pipeline and enters a normal operation state. Because the valve flap 13 and the flow guide sleeve 3 are assembled into a fixed integral, when the valve flap 13 is opened, the through hole 3-1 of the flow guide sleeve 3 is synchronously upward along with the upward movement of the valve flap 13 and staggered with the through hole B9-1 of the flow guide seat 9 to be kept in a relatively closed state, and the air discharge direction is closed at the moment. When the water pump is in a low-load or outlet pipeline valve closing state, the check valve clack 13 is closed under the force of the spring 15, at the moment, the position of the through hole 3-1 of the flow guide sleeve 3 synchronously moves downwards along with the downward movement of the valve clack 13 and is communicated with the position of the through hole B9-1 of the flow guide seat 9, an empty discharge channel is opened, a medium flows towards the empty discharge port of the valve and enters a recirculation bypass, the water pump is ensured not to be overpressurized, and therefore the safe operation of the water pump is ensured.

In the description of the present invention, it should be noted that unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It should be understood that the technical solutions and the inventive concepts of the present invention as equivalent as those of the skilled in the art should be replaced or changed by the claims.

Claims

1. The utility model provides an automatic empty check valve that arranges of tee bend which characterized in that: the valve mainly comprises a lower valve cover (1), a flow guide sleeve (3), a valve body (4), a valve seat (12), a valve clack (13), a guide rod (14), a guide sleeve (16), a valve rod (17) and an upper valve cover (21); the valve body (4) comprises an inlet cavity (4-1), an outlet cavity (4-2) and an empty discharge cavity (4-3) and forms a three-way full-flow flange connection structure, and an upper valve cover (21) and a lower valve cover (1) are fixedly connected to the valve body (4);

the valve seat (12) is fixedly connected to the inner wall of the valve body (4) and arranged at the communication position of the inlet cavity (4-1) and the outlet cavity (4-2), and the valve clack (13) is connected to the valve seat (12) in a matching manner to form a plane sealing structure;

the valve clack (13) is fixedly connected with the flow guide sleeve (3), one end of the guide rod (14) is inserted into the flow guide sleeve (3), the flow guide sleeve (3) is provided with a through hole A (3-1) and is connected into the flow guide seat (9) in a sliding manner, the flow guide seat (9) is provided with a through hole B (9-1) and is installed on the valve body (4) at the communication part of the inlet cavity (4-1) and the empty discharge cavity (4-3), and the axis of the empty discharge cavity (4-3) and the axis of the inlet cavity (4-1) are positioned on the same horizontal plane; the other end of the guide rod (14) is inserted into the guide sleeve (16), a spring (15) is arranged between the guide sleeve (16) and the valve clack (13), and a certain limit distance is reserved between the bottom of the guide sleeve (16) and a spring seat on the valve clack (13);

when the valve clack (13) is in a closed state, the through hole A (3-1) is communicated with the through hole B (9-1), so that the inlet cavity (4-1) is communicated with the empty discharge cavity (4-3); when the valve clack (13) is in an opening state, the inlet cavity (4-1) is communicated with the outlet cavity (4-2), the through hole A (3-1) on the flow guide sleeve (3) synchronously moves upwards along with the valve clack (13), and the positions of the through hole A (3-1) and the through hole B (9-1) are staggered to form a relative closing state.

2. The three-way automatic air discharge check valve of claim 1, wherein: the air exhaust cavity (4-3) is provided with a group of throttling hole plates (23), the diameter and the number of throttling holes of each throttling hole plate (23) are gradually increased along the outlet direction of the air exhaust cavity (4-3), and a protective sleeve (22) is arranged between every two adjacent throttling hole plates (23) and is in fit connection with the inner wall of the air exhaust cavity (4-3).

3. The three-way automatic air discharge check valve of claim 2, wherein: cooperation department of water conservancy diversion seat (9) and valve body (4) be equipped with sealing washer D (26) and constitute first sealing, the cover is equipped with clamp plate (8), elastic sealing circle (6) and clamping ring (5) on water conservancy diversion seat (9), be equipped with right angle sealing block (7) between clamp plate (8) and elastic sealing circle (6), clamping ring (5) threaded connection is on water conservancy diversion seat (9) for clamp plate (8) sticiss to constitute the second on valve body (4) and seal.

4. The three-way automatic empty discharge check valve of claim 3, wherein: the lower valve cover (1) is in threaded connection with the valve body (4), and a sealing ring A (2) is arranged between the lower valve cover (1) and the valve body (4); the upper valve cover (21) is in threaded connection with the valve body (4), and a sealing ring C (25) is arranged between the upper valve cover (21) and the valve body (4).

5. The three-way automatic air discharge check valve of claim 4, wherein: the valve seat (12) is fixedly connected to the valve body (4) through a screw A (10), the valve clack (13) is fixedly connected with the flow guide sleeve (3) through a screw B (24), and a sealing ring B (11) is arranged at the matching position of the valve clack (13) and the valve body (4).

6. The three-way automatic air discharge check valve of claim 5, wherein: a valve rod (17) is arranged in the upper valve cover (21), one end of the valve rod (17) is connected with the guide sleeve (16), and the other end of the valve rod (17) is connected with an adjusting nut (19) to form a spring adjusting device.

7. The three-way automatic air displacement check valve of claim 6, wherein: the upper valve cover (21) is fixedly connected with a connecting block (18), and the connecting block (18) is fixedly connected with the valve cap (20).