阅读说明：本技术 一种双密封副止回阀 (Double-sealing auxiliary check valve ) 是由 陈凯 于 2019-11-16 设计创作，主要内容包括：本发明公开了一种双密封副止回阀,包括有阀体,其特征在于：所述阀杆下端连接有第一调节套,第一调节套内设有内、外阀瓣,内阀瓣与第一调节套之间右旋螺纹连接,外阀瓣与第一调节套之间左旋螺纹连接,且内、外阀瓣之间键式连接,内、外阀瓣由第一调节套驱动上下相对移动；所述中心孔内转动设有第二调节套,第二调节套内设有内、外阀座,第二调节套与外阀座形成左旋螺纹连接,第二调节套与内阀座形成右旋螺纹连接,内、外阀座之间形成键式连接,内、外阀座由第二调节套驱动上下相对移动,且内阀座与内阀瓣密封配合,外阀座与外阀瓣密封配合；所述第二调节套连接有驱动机构。本发明采用双密封副设计,实现内外密封副切换实用。(The invention discloses a double-sealing auxiliary check valve, which comprises a valve body and is characterized in that: the lower end of the valve rod is connected with a first adjusting sleeve, an inner valve clack and an outer valve clack are arranged in the first adjusting sleeve, the inner valve clack is in right-handed threaded connection with the first adjusting sleeve, the outer valve clack is in left-handed threaded connection with the first adjusting sleeve, the inner valve clack and the outer valve clack are in key connection, and the inner valve clack and the outer valve clack are driven by the first adjusting sleeve to move up and down relatively; a second adjusting sleeve is rotatably arranged in the central hole, an inner valve seat and an outer valve seat are arranged in the second adjusting sleeve, the second adjusting sleeve and the outer valve seat form left-handed threaded connection, the second adjusting sleeve and the inner valve seat form right-handed threaded connection, a key type connection is formed between the inner valve seat and the outer valve seat, the inner valve seat and the outer valve seat are driven by the second adjusting sleeve to move up and down relatively, the inner valve seat is in sealing fit with the inner valve clack, and the outer valve seat is in sealing fit with the outer valve clack; the second adjusting sleeve is connected with a driving mechanism. The invention adopts a double-sealing pair design, and realizes the practical switching of the inner sealing pair and the outer sealing pair.)

1. The utility model provides a double containment check valve, including the valve body, be equipped with inlet chamber and outlet chamber in the valve body, inlet chamber is linked together through the centre bore with outlet chamber, the valve body upper end is equipped with the valve gap, rotates on the valve gap to be equipped with the valve rod, and in the valve rod lower extreme stretched into the valve body, the valve rod upper end was connected with hand wheel, its characterized in that: the lower end of the valve rod is connected with a first adjusting sleeve, an inner valve clack and an outer valve clack are arranged in the first adjusting sleeve, a right-handed thread connection is formed between the inner valve clack and the first adjusting sleeve, a left-handed thread connection is formed between the outer valve clack and the first adjusting sleeve, a key connection is formed between the inner valve clack and the outer valve clack, a first anti-rotation structure is arranged between the outer valve clack and the valve body, and the inner valve clack and the outer valve clack are driven by the first adjusting sleeve to move up and down relatively; a second adjusting sleeve is rotatably arranged in the central hole, an inner valve seat and an outer valve seat are arranged in the second adjusting sleeve, a left-handed thread connection is formed between the second adjusting sleeve and the outer valve seat, a right-handed thread connection is formed between the second adjusting sleeve and the inner valve seat, a key connection is formed between the inner valve seat and the outer valve seat, a second anti-rotation structure is arranged between the outer valve seat and the valve body, the inner valve seat and the outer valve seat are driven by the second adjusting sleeve to move up and down relatively, the upper end face of the inner valve seat is in sealing fit with the lower end face of the inner valve flap, and the upper end face of the outer valve seat is in sealing fit; the second adjusting sleeve is connected with a driving mechanism.

2. The dual sealing sub check valve of claim 1, wherein: the driving mechanism comprises a driving rod, an upper gear and a lower gear, the upper gear is arranged at the upper end of the driving rod, the lower gear is arranged at the lower end of the driving rod, the driving rod is rotatably arranged on the valve body corresponding to the left side of the center hole in a penetrating mode, the lower gear is in transmission engagement with the second adjusting sleeve, the upper gear is in transmission connection with the valve rod, a main gear is arranged on the corresponding valve rod, and the main gear is in transmission engagement with the upper gear.

3. The dual sub-sealing check valve of claim 2, wherein: the positioning disc is sleeved at the upper ends of the driving rod and the valve rod, the driving rod and the valve rod can be rotatably arranged on the positioning disc, and the positioning disc is connected to the valve cover through a support.

4. The dual sealing sub check valve of claim 1, wherein: a first stepped hole is formed in the first adjusting sleeve, the inner valve clack is in right-handed threaded connection with a small hole of the first stepped hole, and the outer valve clack is in left-handed threaded connection with a large hole of the first stepped hole.

5. The dual sealing sub check valve of claim 1, wherein: and a second stepped hole is formed in the second adjusting sleeve, the inner valve seat is in right-handed threaded connection with the small hole of the second stepped hole, and the outer valve seat is in left-handed threaded connection with the large hole of the second stepped hole.

6. The dual sealing sub check valve of claim 1, wherein: the first adjusting sleeve is externally provided with a guide sleeve, the guide sleeve is fixed in the valve body, and the first adjusting sleeve is rotatably arranged in the guide sleeve.

7. The dual sealing sub check valve of claim 1, wherein: the first anti-rotation structure comprises a first anti-rotation pin, the first anti-rotation pin is fixed on the periphery of the outer valve clack, a first anti-rotation groove is formed in the corresponding valve body, and the first anti-rotation pin can move up and down and is limited in the first anti-rotation groove.

8. The dual sealing sub check valve of claim 1, wherein: the second anti-rotation structure comprises a second anti-rotation pin, the second anti-rotation pin is fixed on the periphery of the outer valve seat, a second anti-rotation groove is formed in the corresponding valve body, and the second anti-rotation pin can move up and down and is limited in the second anti-rotation groove.

Technical Field

The invention relates to an improved check valve, in particular to an improved double-sealing auxiliary check valve.

Background

The check valve is a valve widely used in petroleum pipelines, natural gas pipelines and chemical engineering systems, the traditional check valve only has a pair of sealing pairs, if the valve is damaged, the valve can only be detached for maintenance or replacement, and at the moment, the whole pipeline is in an operating state, the pipeline and operating equipment need to be stopped, so that material loss, construction period delay and the like are caused, and inestimable loss is caused.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a double-sealing auxiliary check valve which is reasonable in structure and can be switched to use.

In order to solve the technical problems, the invention is realized by adopting the following technical scheme: this kind of double containment check valve, including the valve body, be equipped with inlet chamber and outlet chamber in the valve body, inlet chamber is linked together through the centre bore with outlet chamber, the valve body upper end is equipped with the valve gap, rotates on the valve gap to be equipped with the valve rod, and in the valve rod lower extreme stretched into the valve body, the valve rod upper end was connected with hand wheel, its characterized in that: the lower end of the valve rod is connected with a first adjusting sleeve, an inner valve clack and an outer valve clack are arranged in the first adjusting sleeve, a right-handed thread connection is formed between the inner valve clack and the first adjusting sleeve, a left-handed thread connection is formed between the outer valve clack and the first adjusting sleeve, a key connection is formed between the inner valve clack and the outer valve clack, a first anti-rotation structure is arranged between the outer valve clack and the valve body, and the inner valve clack and the outer valve clack are driven by the first adjusting sleeve to move up and down relatively; a second adjusting sleeve is rotatably arranged in the central hole, an inner valve seat and an outer valve seat are arranged in the second adjusting sleeve, a left-handed thread connection is formed between the second adjusting sleeve and the outer valve seat, a right-handed thread connection is formed between the second adjusting sleeve and the inner valve seat, a key connection is formed between the inner valve seat and the outer valve seat, a second anti-rotation structure is arranged between the outer valve seat and the valve body, the inner valve seat and the outer valve seat are driven by the second adjusting sleeve to move up and down relatively, the upper end face of the inner valve seat is in sealing fit with the lower end face of the inner valve flap, and the upper end face of the outer valve seat is in sealing fit; the second adjusting sleeve is connected with a driving mechanism.

The driving mechanism comprises a driving rod, an upper gear and a lower gear, the upper gear is arranged at the upper end of the driving rod, the lower gear is arranged at the lower end of the driving rod, the driving rod is rotatably arranged on the valve body corresponding to the left side of the center hole in a penetrating mode, the lower gear is in transmission engagement with the second adjusting sleeve, the upper gear is in transmission connection with the valve rod, a main gear is arranged on the corresponding valve rod, and the main gear is in transmission engagement with the upper gear.

The positioning disc is sleeved at the upper ends of the driving rod and the valve rod, the driving rod and the valve rod can be rotatably arranged on the positioning disc, and the positioning disc is connected to the valve cover through a support.

A first stepped hole is formed in the first adjusting sleeve, the inner valve clack is in right-handed threaded connection with a small hole of the first stepped hole, and the outer valve clack is in left-handed threaded connection with a large hole of the first stepped hole.

And a second stepped hole is formed in the second adjusting sleeve, the inner valve seat is in right-handed threaded connection with the small hole of the second stepped hole, and the outer valve seat is in left-handed threaded connection with the large hole of the second stepped hole.

The first adjusting sleeve is externally provided with a guide sleeve, the guide sleeve is fixed in the valve body, and the first adjusting sleeve is rotatably arranged in the guide sleeve.

The first anti-rotation structure comprises a first anti-rotation pin, the first anti-rotation pin is fixed on the periphery of the outer valve clack, a first anti-rotation groove is formed in the corresponding valve body, and the first anti-rotation pin can move up and down and is limited in the first anti-rotation groove.

The second anti-rotation structure comprises a second anti-rotation pin, the second anti-rotation pin is fixed on the periphery of the outer valve seat, a second anti-rotation groove is formed in the corresponding valve body, and the second anti-rotation pin can move up and down and is limited in the second anti-rotation groove.

The improved double-seal pair check valve has the advantages that the improved double-seal pair check valve adopts a double-seal pair design, when an inner seal pair fails, the inner seal pair is switched into an outer seal pair for sealing on line by using a switching mechanism, pipelines and equipment do not need to be shut down, the valve does not need to be detached for maintenance, and the improved double-seal pair check valve has the advantages of long service life, high reliability and low use cost.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The drawings show the structure of the invention, and the details thereof are further described below with reference to the drawings. Referring to the attached drawing 1, the double-sealing auxiliary check valve comprises a valve body 1, wherein an inlet cavity 2 and an outlet cavity 20 are arranged in the valve body 1, the inlet cavity 2 is communicated with the outlet cavity 20 through a central hole 22, a valve cover 13 is arranged at the upper end of the valve body 1, a valve rod 14 is rotatably arranged on the valve cover 13, the lower end of the valve rod 14 extends into the valve body 1, a hand wheel 17 is connected to the upper end of the valve rod 14, a first adjusting sleeve 11 is connected to the lower end of the valve rod 14, an inner valve flap 10 and an outer valve flap 9 are arranged in the first adjusting sleeve 11, the inner valve flap 10 is in right-handed threaded connection with the first adjusting sleeve 11, the outer valve flap 9 is in left-handed threaded connection with the first adjusting sleeve 11, the inner valve flap 10 is in key connection with the outer valve flap 9, a first anti-rotation structure 8 is arranged between the outer valve flap 9 and the valve body 1, and the inner valve flap 10 and; a second adjusting sleeve 4 is rotatably arranged in the central hole, an inner valve seat 5 and an outer valve seat 6 are arranged in the second adjusting sleeve 4, a left-handed thread connection is formed between the second adjusting sleeve 4 and the outer valve seat 6, a right-handed thread connection is formed between the second adjusting sleeve 4 and the inner valve seat 5, a key connection is formed between the inner valve seat 5 and the outer valve seat 6, a second anti-rotation structure 21 is arranged between the outer valve seat 6 and the valve body 1, the inner valve seat 5 and the outer valve seat 6 are driven by the second adjusting sleeve 4 to move up and down relatively, the upper end face of the inner valve seat 5 is in sealing fit with the lower end face of the inner valve flap 10, and the upper end face of the outer valve seat 6 is in sealing fit with; the second adjusting sleeve 4 is connected with a driving mechanism.

The driving mechanism comprises a driving rod 7, an upper gear 15 and a lower gear 3, wherein the upper gear 15 is arranged at the upper end of the driving rod 7, the lower gear 3 is arranged at the lower end of the driving rod 7, the driving rod 7 is rotatably arranged on the valve body 1 corresponding to the left side of the central hole 22 in a penetrating mode, the lower gear 3 is in transmission engagement with the second adjusting sleeve 4, the upper gear 15 is in transmission connection with the valve rod 14, a main gear 18 is arranged on the corresponding valve rod 14, and the main gear 18 is in transmission engagement with the upper gear 15.

Positioning discs 16 are sleeved at the upper ends of the driving rod 7 and the valve rod 14, the driving rod 7 and the valve rod 14 can be rotatably arranged on the positioning discs 16, the positioning discs 16 are connected to the valve cover 13 through supports 19, and the positioning discs 16 play a supporting and positioning role for the driving rod 7 and the valve rod 14.

A first step hole is formed in the first adjusting sleeve 11, a right-handed threaded connection is formed between the inner valve flap 10 and a small hole of the first step hole, a left-handed spiral thread connection is formed between the outer valve flap 9 and a large hole of the first step hole, and the outer valve flap 9 can move up and down relatively and is sleeved on the outer side of the inner valve flap 10.

And a second stepped hole is formed in the second adjusting sleeve 4, the inner valve seat 5 is in right-hand threaded connection with a small hole of the second stepped hole, the outer valve seat 6 is in left-hand threaded connection with a large hole of the second stepped hole, and the outer valve seat 6 can move up and down relatively and is sleeved outside the inner valve seat 5.

The guide sleeve 12 is arranged outside the first adjusting sleeve 11, the guide sleeve 12 is fixed in the valve body 1, the first adjusting sleeve 11 is rotatably arranged in the guide sleeve 12, and the guide sleeve 12 plays a supporting and guiding role for the first adjusting sleeve 11.

The first anti-rotation structure 8 comprises a first anti-rotation pin, the first anti-rotation pin is fixed on the periphery of the outer valve clack 9, a first anti-rotation groove is formed in the corresponding valve body 1, and the first anti-rotation pin can move up and down and is limited in the first anti-rotation groove.

The second anti-rotation structure 21 includes a second anti-rotation pin fixed on the periphery of the outer valve seat 6, and a second anti-rotation groove is formed in the corresponding valve body 1, and the second anti-rotation pin can move up and down and is limited in the second anti-rotation groove.

According to the working principle of the invention, an inner sealing pair is formed between an inner valve seat 5 and an inner valve flap 10, an outer sealing pair is formed between an outer valve seat 6 and an outer valve flap 9, when the inner sealing pair is damaged and fails, a hand wheel 17 is rotated clockwise to drive a valve rod 14 to rotate clockwise, the valve rod 14 drives a first adjusting sleeve 11 to rotate clockwise, and due to the fact that right-handed thread connection is formed between the inner valve flap 10 and the first adjusting sleeve 11, left-handed thread connection is formed between the outer valve flap 9 and the first adjusting sleeve 11, key connection is formed between the inner valve flap 10 and the outer valve flap 9, and the outer valve flap 9 is acted by a first anti-rotation structure 8, the inner valve flap 10 and the outer valve flap 9 form up-down relative movement, so when the first adjusting sleeve 11 is rotated clockwise, the inner valve flap 10 moves up, and the outer valve flap 9 moves down; meanwhile, the driving rod 7 is driven by the main gear 18 and the upper gear 15 to rotate anticlockwise and drive the lower gear 3 to rotate anticlockwise, the lower gear 3 and the second adjusting sleeve 4 form a gear transmission relationship, so that the second adjusting sleeve 4 rotates clockwise, the second adjusting sleeve 4 and the outer valve seat 6 form left-handed threaded connection, the second adjusting sleeve 4 and the inner valve seat 5 form right-handed threaded connection, the inner valve seat 5 and the outer valve seat 6 form key connection, the outer valve seat 6 forms up-and-down relative movement between the inner valve seat 5 and the outer valve seat 6 under the action of a second anti-rotation structure, the second adjusting sleeve 4 drives the outer valve seat 6 to move upwards, and the inner valve seat 5 moves downwards; when the upper end surface of the outer valve seat 6 and the lower end surface of the outer valve flap 9 are contacted and pressed mutually, the outer sealing pair forms sealing, and the hand wheel 17 stops rotating. In a similar way, the hand wheel 17 is rotated anticlockwise, the upper end face of the inner valve seat 5 is contacted with the lower end face of the outer valve seat 6 and is pressed tightly, and the inner sealing pair forms sealing. The left-hand thread connection and the right-hand thread connection can be interchanged, so that the downward movement of the outer valve clack, the upward movement of the inner valve clack, the upward movement of the outer valve seat and the downward movement of the inner valve seat can be realized simultaneously; or the outer valve flap moves upwards, the inner valve flap moves downwards, the outer valve seat moves downwards, and the inner valve seat moves upwards.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.