CN216078451U

CN216078451U - Safety check valve

Info

Publication number: CN216078451U
Application number: CN202122105949.6U
Authority: CN
Inventors: 陆德鹏; 陆福生
Original assignee: Jiangsu Xinpengsheng Petroleum Machinery Co ltd
Current assignee: Jiangsu Xinpengsheng Petroleum Machinery Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-03-18
Anticipated expiration: 2031-09-02

Abstract

The utility model discloses a safety check valve, which comprises: the valve comprises a valve body, wherein an upper threaded joint is arranged on the outer side of the upper end of the valve body, a lower threaded joint is arranged on the outer side of the lower end of the valve body, a first valve seat is arranged at the lower end of the valve body, a first inlet channel is arranged in the first valve seat, a valve cover is arranged at the upper end of the valve body, an outlet channel is arranged on the valve cover, a second valve seat is arranged in the middle of the valve body, a second inlet channel is arranged in the second valve seat, a first valve core matched with the first valve seat is arranged at the upper end of the first valve seat, a first lower spring groove is arranged at the upper end of the first valve core, a second valve core matched with the second valve seat is arranged at the upper end of the second valve seat, and a first upper spring groove is arranged at the lower end of the second valve core.

Description

Safety check valve

Technical Field

The utility model relates to the technical field of valves, in particular to a safe check valve.

Background

The check valve is a commonly used auxiliary apparatus for medium transportation, mainly aims to prevent the medium from flowing backwards or perform a flow-stopping treatment on the medium, plays an effective control role in the transportation of the medium, and is also commonly applied to oil well operation. The existing check valve can only be sealed once, is poor in sealing effect, is easy to cause medium backflow and leakage after the valve core is worn, is unsatisfactory in use effect, has certain potential safety hazard, and is difficult to replace the valve core and inconvenient to disassemble and assemble.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the safety check valve with good sealing effect is provided.

In order to solve the technical problems, the utility model adopts the technical scheme that: a safety check valve, comprising: the valve comprises a valve body, wherein an upper threaded joint is arranged on the outer side of the upper end of the valve body, a lower threaded joint is arranged on the outer side of the lower end of the valve body, a first valve seat is arranged at the lower end of the valve body, a first inlet channel is arranged in the first valve seat, a valve cover is arranged at the upper end of the valve body, an outlet channel is arranged on the valve cover, a second valve seat is arranged in the middle of the valve body, a second inlet channel is arranged in the second valve seat, a first valve core matched with the first valve seat is arranged at the upper end of the first valve seat, a first lower spring groove is arranged at the upper end of the first valve core, a second valve core matched with the second valve seat is arranged at the upper end of the second valve seat, a first upper spring groove is arranged at the lower end of the second valve core, a first return spring is arranged between the first lower spring groove and the first upper spring groove, and the lower end of the first return spring is abutted against the first valve core, the upper end of the first reset spring is abutted against a second valve core, first guide rods are symmetrically arranged between a first valve seat and a second valve seat on two sides of the first valve core, first guide holes in sliding fit with the first guide rods are symmetrically arranged on two sides of the first valve core, a second lower spring groove is arranged at the upper end of the second valve core, a second upper spring groove is arranged at the lower end of the valve cover, a second reset spring is arranged between the second lower spring groove and the second upper spring groove, the lower end of the second reset spring is abutted against the second valve core, the upper end of the second reset spring is abutted against the valve cover, second guide rods are symmetrically arranged between the second valve seat and the valve cover on two sides of the second valve core, and second guide holes in mutual fit with the second guide rods are symmetrically arranged on two sides of the second valve core.

In order to better solve the technical problems, the utility model adopts the further technical scheme that: the two sides of the first valve seat are symmetrically provided with first sliding holes matched with the first guide rod, the lower end of the first guide rod penetrates through the first sliding holes in a sliding mode, the upper end of the first guide rod is connected in the second valve seat in a threaded mode, the lower end of the first guide rod is provided with a first screwdriver tightening bayonet, and a first plug is arranged in the first sliding hole in the lower end of the first guide rod.

In order to better solve the technical problems, the utility model adopts the further technical scheme that: second sliding holes matched with the second guide rod are symmetrically formed in two sides of the valve cover, the upper end of the second guide rod penetrates through the second sliding holes in a sliding mode, the lower end of the second guide rod is in threaded connection with the second valve seat, a second screwdriver tightening bayonet is formed in the upper end of the second guide rod, and a second plug is arranged in the second sliding hole in the upper end of the second guide rod.

In order to better solve the technical problems, the utility model adopts the further technical scheme that: and the first valve seat and the valve body and the valve cover and the valve body are respectively connected through threads.

In order to better solve the technical problems, the utility model adopts the further technical scheme that: the second valve seat is connected with the valve body in an interference fit mode.

In order to better solve the technical problems, the utility model adopts the further technical scheme that: and sealing rings are respectively arranged between the first valve seat and the valve body, between the valve cover and the valve body, between the second valve seat and the valve body, between the first guide rod and the first valve seat and between the second guide rod and the valve cover.

In order to better solve the technical problems, the utility model adopts the further technical scheme that: the elastic force of the second return spring is larger than that of the first return spring.

The utility model has the advantages that: above-mentioned safe check valve adopts double-valve core and double-valve seat structure, can carry out twice and seal, even a case takes place wearing and tearing, another case can continue to realize the function of damming, prevents the medium backward flow seepage, and is sealed effectual, safe and reliable, and simultaneously, double-valve core can carry out the dismouting change fast, and it is convenient to change.

Drawings

Fig. 1 is a schematic structural view of the safety check valve of the present invention.

In the figure: 1. the valve body, 2, an upper threaded connector, 3, a lower threaded connector, 4, a first valve seat, 5, a first inlet channel, 6, a valve cover, 7, an outlet channel, 8, a second valve seat, 9, a second inlet channel, 10, a first valve core, 11, a first lower spring groove, 12, a second valve core, 13, a first upper spring groove, 14, a first return spring, 15, a first guide rod, 151, a first screwdriver tightening bayonet, 16, a first guide hole, 17, a second lower spring groove, 18, a second upper spring groove, 19, a second return spring, 20, a second guide rod, 201, a second screwdriver tightening bayonet, 21, a second guide hole, 22, a first plug, 23 and a second plug.

Detailed Description

The details of the present invention are described below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the safety check valve includes: the valve comprises a valve body 1, an upper threaded joint 2 is arranged on the outer side of the upper end of the valve body 1, a lower threaded joint 3 is arranged on the outer side of the lower end of the valve body 1, a first valve seat 4 is arranged on the lower end of the valve body 1, a first inlet channel 5 is arranged in the first valve seat 4, a valve cover 6 is arranged on the upper end of the valve body 1, an outlet channel 7 is arranged on the valve cover 6, a second valve seat 8 is arranged in the middle of the valve body 1, a second inlet channel 9 is arranged in the second valve seat 8, a first valve core 10 matched with the first valve seat 4 is arranged on the upper end of the first valve seat 4, a first lower spring groove 11 is arranged on the upper end of the first valve core 10, a second valve core 12 matched with the second valve seat 8 is arranged on the upper end of the second valve core 12, a first upper spring groove 13 is arranged on the lower end of the second valve core 12, and a first return spring 14 is arranged between the first lower spring groove 11 and the first upper spring groove 13, the lower end of the first return spring 14 is abutted against the first valve core 10, the upper end of the first return spring 14 is abutted against the second valve core 12, first guide rods 15 are symmetrically arranged between the first valve seat 4 and the second valve seat 8 on both sides of the first valve core 10, first guide holes 16 which are in sliding fit with the first guide rods 15 are symmetrically arranged on both sides of the first valve core 10, a second lower spring groove 17 is arranged on the upper end of the second valve core 12, a second upper spring groove 18 is arranged on the lower end of the valve cover 6, a second return spring 19 is arranged between the second lower spring groove 17 and the second upper spring groove 18, the lower end of the second return spring 19 is abutted against the second valve core 12, the upper end of the second return spring 19 is abutted against the valve cover 6, second guide rods 20 are symmetrically arranged between the second valve seat 8 and the valve cover 6 on both sides of the second valve core 12, second guide holes 21 matched with the second guide rods 20 are symmetrically formed at both sides of the second valve core 12.

As shown in fig. 1, in this example, for the convenience of disassembly, first sliding holes are symmetrically formed on both sides of the first valve seat 4, the first guiding rod 15 is slidably inserted into the first sliding hole at the lower end, the upper end of the first guiding rod 15 is screwed into the second valve seat 8, a first screwdriver fastening bayonet 151 is formed at the lower end of the first guiding rod 15, and a first plug 22 is disposed in the first sliding hole at the lower end of the first guiding rod 15.

As shown in fig. 1, in this example, for the convenience of detachment, second sliding holes are symmetrically formed on both sides of the valve cover 6, the second guiding rod 20 is slidably inserted into the second sliding hole at the upper end, the lower end of the second guiding rod 20 is screwed into the second valve seat 8, the second screwdriver fastening bayonet 201 is formed at the upper end of the second guiding rod 20, and the second plug 23 is disposed in the second sliding hole at the upper end of the second guiding rod 20.

As shown in fig. 1, in this example, for the sake of easy disassembly, the first valve seat 4 and the valve body 1 and the bonnet 6 and the valve body 1 are respectively connected by threads.

As shown in fig. 1, in this example, in order to prevent the second valve seat 8 from being separated from the valve body 1, the second valve seat 8 is connected with the valve body 1 in an interference fit manner.

As shown in fig. 1, in this example, in order to increase the sealing effect, sealing rings are respectively disposed between the first valve seat 4 and the valve body 1, between the bonnet 6 and the valve body 1, between the second valve seat 8 and the valve body 1, between the first guide rod 15 and the first valve seat 4, and between the second guide rod 20 and the bonnet 6.

As shown in fig. 1, in this example, in order to ensure that the first valve spool 10 and the second valve spool 12 can automatically seal together when the springs are reset, the elastic force of the second reset spring 19 is greater than that of the first reset spring 14.

When the safety check valve is installed, the second valve seat 8 is fixed in the middle of the valve body 1, the second valve spool 12 is placed in the valve body 1 at the upper end of the second valve seat 8, the second guide rod 20 slides through the second guide hole 21 and then is screwed at the upper end of the second valve seat 8, the second return spring 19 is placed in the second lower spring groove 17 from the upper end of the valve body 1, the valve cover 6 is placed at the upper end of the valve body 1, the upper end of the second guide rod 20 extends into the second sliding hole of the valve cover 6, the second plug 23 is inserted into the second sliding hole for plugging, the second return spring 19 is clamped between the second lower spring groove 17 and the second upper spring groove 18, the second valve spool 12 is pushed downwards to abut against the upper end of the second valve seat 8 under the extrusion of the second return spring 19, the first return spring 14 is placed in the first upper spring groove 13 from the lower end of the valve body 1, the first valve spool 12 is placed in the valve body 1 at the lower end of the second valve seat 8, the first guide rod 15 slides through the first guide hole 16 and then is screwed at the lower end of the second valve seat 8, the first valve seat 4 is installed at the lower end of the valve body 1, the lower end of the first guide rod 15 extends into the first sliding hole of the first valve seat 4, and the first plug 22 is inserted into the first sliding hole for plugging.

The working principle is as follows: the medium enters from the first inlet channel 5, the first valve core 10 is pushed upwards and compresses the first return spring 14, the first return spring 14 applies upward pressure to the second valve core 12, the second valve core 12 applies upward pressure to the second return spring 19, the medium passes through the valve body 1 at the lower end of the second valve seat 8 and continues to enter the second inlet channel 9, the medium pushes upwards the second valve core 12 and compresses the second return spring 19, the medium enters the outlet channel 7 from the valve body 1 at the upper end of the second valve seat 8 and is discharged, and at the moment, one-way medium circulation is realized; when the medium flows back, the second valve core 12 is pushed to move downwards to abut against the second valve seat 8 to realize sealing under the reset pressure of the second reset spring 19 and the medium backflow pressure, the first reset spring 14 is reset to push the first valve core 10 to move downwards to abut against the first valve seat 4 to realize sealing, and the double valve cores and the valve seats realize secondary sealing.

Above-mentioned safe check valve adopts double-valve core and double-valve seat structure, can carry out twice and seal, even a case takes place wearing and tearing, another case can continue to realize the function of damming, prevents the medium backward flow seepage, and is sealed effectual, safe and reliable, and simultaneously, double-valve core can carry out the dismouting change fast, and it is convenient to change.

Claims

1. Safe single current valve, its characterized in that: the method comprises the following steps: the valve comprises a valve body (1), an upper threaded joint (2) is arranged on the outer side of the upper end of the valve body (1), a lower threaded joint (3) is arranged on the outer side of the lower end of the valve body (1), a first valve seat (4) is arranged on the lower end of the valve body (1), a first inlet channel (5) is arranged in the first valve seat (4), a valve cover (6) is arranged on the upper end of the valve body (1), an outlet channel (7) is arranged on the valve cover (6), a second valve seat (8) is arranged in the middle of the valve body (1), a second inlet channel (9) is arranged in the second valve seat (8), a first valve core (10) matched with the first valve seat (4) is arranged on the upper end of the first valve core (10), a first lower spring groove (11) is arranged on the upper end of the first valve core (10), a second valve core (12) matched with the second valve core is arranged on the upper end of the second valve seat (8), a first upper spring groove (13) is arranged at the lower end of the second valve core (12), a first return spring (14) is arranged between the first lower spring groove (11) and the first upper spring groove (13), the lower end of the first return spring (14) is abutted against the first valve core (10), the upper end of the first return spring (14) is abutted against the second valve core (12), first guide rods (15) are symmetrically arranged between a first valve seat (4) and a second valve seat (8) at two sides of the first valve core (10), first guide holes (16) in sliding fit with the first guide rods (15) are symmetrically arranged at two sides of the first valve core (10), a second lower spring groove (17) is arranged at the upper end of the second valve core (12), a second upper spring groove (18) is arranged at the lower end of the valve cover (6), and a second return spring (19) is arranged between the second lower spring groove (17) and the second upper spring groove (18), the lower end of the second return spring (19) abuts against the second valve core (12), the upper end of the second return spring (19) abuts against the valve cover (6), second guide rods (20) are symmetrically arranged between the second valve seats (8) and the valve cover (6) on two sides of the second valve core (12), and second guide holes (21) matched with the second guide rods (20) are symmetrically arranged on two sides of the second valve core (12).

2. The safety check valve as recited in claim 1, wherein: the two sides of the first valve seat (4) are symmetrically provided with first sliding holes matched with the first guide rod (15), the lower end of the first guide rod (15) penetrates through the first sliding holes in a sliding mode, the upper end of the first guide rod (15) is in threaded connection with the second valve seat (8), the lower end of the first guide rod (15) is provided with a first screwdriver screwing bayonet (151), and a first plug (22) is arranged in the first sliding hole at the lower end of the first guide rod (15).

3. The safety check valve as recited in claim 2, wherein: second sliding holes matched with a second guide rod (20) are symmetrically formed in two sides of the valve cover (6), the upper end of the second guide rod (20) penetrates through the second sliding holes in a sliding mode, the lower end of the second guide rod (20) is in threaded connection with a second valve seat (8), a second screwdriver tightening bayonet (201) is formed in the upper end of the second guide rod (20), and a second plug (23) is arranged in the second sliding hole in the upper end of the second guide rod (20).

4. The safety check valve as recited in claim 1, wherein: the first valve seat (4) is connected with the valve body (1) through threads, and the valve cover (6) is connected with the valve body (1) through threads.

5. The safety check valve as recited in claim 1, wherein: the second valve seat (8) is connected with the valve body (1) in an interference fit manner.

6. The safety check valve as recited in claim 1, wherein: and sealing rings are respectively arranged between the first valve seat (4) and the valve body (1), between the valve cover (6) and the valve body (1), between the second valve seat (8) and the valve body (1), between the first guide rod (15) and the first valve seat (4) and between the second guide rod (20) and the valve cover (6).

7. The safety check valve as recited in claim 3, wherein: the elastic force of the second return spring (19) is greater than the elastic force of the first return spring (14).