阅读说明：本技术 一种定差压力补偿阀 (Constant differential pressure compensating valve ) 是由 陈龙威 于 2019-12-16 设计创作，主要内容包括：本发明公开了一种定差压力补偿阀,包括上缸体、下缸体、压差发生器、密封垫Ⅰ、O型圈、沉头螺钉；上缸体和下缸体固定连接,上缸体上设密封垫Ⅰ,下缸体上设O型圈；压差发生器设在上、下缸体内部的螺杆上；上缸体、下缸体、压差发生器的阀座上均开设有导向孔,用于固定螺杆,并保证阀座在螺杆上做上下运动。本发明减少了压差波动范围,具有自动补偿压力、保持压差、手动应急泄压功能。(The invention discloses a constant differential pressure compensation valve which comprises an upper cylinder body, a lower cylinder body, a differential pressure generator, a sealing gasket I, an O-shaped ring and a sunk screw, wherein the upper cylinder body is provided with a sealing gasket; the upper cylinder body is fixedly connected with the lower cylinder body, a sealing gasket I is arranged on the upper cylinder body, and an O-shaped ring is arranged on the lower cylinder body; the differential pressure generator is arranged on the screw rods in the upper cylinder body and the lower cylinder body; the valve seats of the upper cylinder body, the lower cylinder body and the differential pressure generator are all provided with guide holes for fixing the screw rod and ensuring that the valve seats move up and down on the screw rod. The invention reduces the fluctuation range of the pressure difference, and has the functions of automatically compensating the pressure, keeping the pressure difference and manually releasing the pressure in an emergency way.)

1. A constant differential pressure compensating valve is characterized in that: the device comprises an upper cylinder body, a lower cylinder body, a differential pressure generator, a sealing gasket I, an O-shaped ring and a countersunk head screw; the upper cylinder body is fixedly connected with the lower cylinder body, a sealing gasket I is arranged on the upper cylinder body, and an O-shaped ring is arranged on the lower cylinder body; the differential pressure generator is arranged on the screw rods in the upper cylinder body and the lower cylinder body; the valve seats of the upper cylinder body, the lower cylinder body and the differential pressure generator are all provided with guide holes for fixing the screw rod and ensuring that the valve seats move up and down on the screw rod.

2. A constant differential pressure compensating valve as defined in claim 1, wherein: the cavity formed by the upper cylinder body and the valve seat is an upper cavity.

3. A constant differential pressure compensating valve as defined in claim 1, wherein: the cavity formed by the lower cylinder body and the valve seat is a lower cavity.

4. A constant differential pressure compensating valve as defined in claim 1, wherein: the pressure difference generator consists of a large spring, a small spring, a valve seat, a sealing gasket II and an umbrella-shaped valve core; the large spring, the umbrella-shaped valve core and the sealing gasket II are sequentially arranged on the valve seat, and the small spring is arranged on the umbrella-shaped valve core.

5. A constant differential pressure compensating valve as defined in claim 1, wherein: the umbrella-shaped valve core consists of an upper pressing sheet, a lower pressing sheet, a lip-shaped sealing gasket and a nut; the lip-shaped sealing gasket is fastened by an upper pressing sheet and a lower pressing sheet and is fixed on the screw rod by a nut.

6. A constant differential pressure compensating valve as defined in claim 1, wherein: the valve seat is of a stepped shaft structure, a groove is formed between a large cylinder and a small cylinder and used for mounting a sealing gasket II, a stepped hole is formed in the valve seat, a large hole is used for mounting a large spring, a small hole is a guide hole, a strip waist-shaped groove is formed in the lower end face of the small hole, and the waist-shaped groove is a fluid channel of an upper cavity and a lower cavity.

Technical Field

The invention relates to a constant differential pressure compensating valve for a fluid pressure transmission system.

Background

In a fluid pressure transmission system, different fixed pressures are required to be realized between two cavities, automatic adjustment is realized according to pressure fluctuation of the two cavities, constant pressure difference is kept, and the traditional method for adjusting different pressures by using two overflow valves has the defect of large pressure difference fluctuation.

Disclosure of Invention

In order to solve the technical problems, the invention provides a constant-pressure differential pressure compensation valve which comprises an upper cylinder body, a lower cylinder body, a differential pressure generator, a sealing gasket I, an O-shaped ring and a sunk screw; the upper cylinder body is fixedly connected with the lower cylinder body, a sealing gasket I is arranged on the upper cylinder body, and an O-shaped ring is arranged on the lower cylinder body; the differential pressure generator is arranged on the screw rods in the upper cylinder body and the lower cylinder body; the valve seats of the upper cylinder body, the lower cylinder body and the differential pressure generator are all provided with guide holes for fixing the screw rod and ensuring that the valve seats move up and down on the screw rod.

Furthermore, a cavity formed by the upper cylinder body and the valve seat is an upper cavity.

Furthermore, a cavity formed by the lower cylinder body and the valve seat is a lower cavity.

Furthermore, the differential pressure generator consists of a large spring, a small spring, a valve seat, a sealing gasket II and an umbrella-shaped valve core; the large spring, the umbrella-shaped valve core and the sealing gasket II are sequentially arranged on the valve seat, and the small spring is arranged on the umbrella-shaped valve core.

Further, the umbrella-shaped valve core consists of an upper pressing sheet, a lower pressing sheet, a lip-shaped sealing gasket and a nut; the lip-shaped sealing gasket is fastened by an upper pressing sheet and a lower pressing sheet and is fixed on the screw rod by a nut.

Furthermore, a groove is formed between the valve seat and the large cylinder and the small cylinder in a stepped shaft structure and used for mounting a sealing gasket II, a stepped hole is formed in the valve seat, the large hole is used for mounting a large spring, the small hole is a guide hole, a strip waist-shaped groove is formed in the lower end face of the small hole, and the waist-shaped groove is a fluid passage of the upper cavity and the lower cavity.

The invention reduces the fluctuation range of the pressure difference, and has the functions of automatically compensating the pressure, keeping the pressure difference and manually releasing the pressure in an emergency way.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is an exploded view of the differential pressure generator of the present invention.

In the figure, 1, an upper cylinder body, 2, a lower cylinder body, 3, a pressure difference generator, 5, a sealing gasket I, 6, an umbrella-shaped valve core, 61, an upper pressing sheet, 62, a lower pressing sheet, 63, a lip-shaped sealing gasket, 64, a nut, 7, a small spring, 8, a sealing gasket II, 9, a valve seat, 10, a screw rod, 11, a large spring, 12, an O-shaped ring, 13, a sunk screw, 14, a waist-shaped groove, 15, a large hole, 16, a guide hole, 17, a guide hole and 18.

Detailed Description

As shown in figures 1 and 2, the constant-pressure differential pressure compensation valve comprises an upper cylinder body 1, a lower cylinder body 2, a differential pressure generator 3, a sealing gasket I5, an O-shaped ring 12 and a sunk screw 13. The upper cylinder body 1 and the lower cylinder body 2 are fixedly connected through a sunk screw 13, the O-shaped ring 12 is installed on the lower cylinder body 2, the differential pressure generator 3 is installed on a screw rod 10 inside the upper cylinder body and the lower cylinder body, and the sealing gasket I5 is installed on the upper cylinder body 1.

The upper end of the upper cylinder body 1 is externally provided with screw threads, the cylinder body is provided with 3 waist-shaped grooves 14, the interior of the upper cylinder body is of a hollow structure, a small hole is a guide hole 16 on the upper surface, a step hole is arranged on the lower surface, and the lower end and the interior of the upper cylinder body are connected through a flange.

The upper end of the lower cylinder body 2 is in flange connection, six holes are formed in the cylinder body, the interior of the cylinder body is of a hollow structure, a boss is arranged in the cylinder body, a guide hole 16 is formed in the boss, a small hole is drilled at the bottom of the boss, and an O-shaped ring groove is formed in the flange face of the upper end and used for installing an O-shaped ring 12.

The sealing gasket I5 is a circular gasket, is provided with an opening and is connected with the flange of the upper cylinder body 1.

The sealing gasket II 8 is a circular gasket, the middle of the sealing gasket is provided with a hole, and the sealing gasket II is arranged on the valve seat 9.

The upper pressing piece 61 is a circular washer with a hole in the middle.

The lower pressing plate 62 is a circular washer with a stepped hole in the middle.

The lip-shaped gasket 63 is of a cylindrical structure, has a stepped hole in the middle, and is lip-shaped on the upper surface.

The screw 10 has a stepped shaft structure, and a section of external threads is arranged below the stepped shaft structure and is used for connecting the nut 64.

As shown in fig. 3, the differential pressure generator 3 is composed of a large spring 11, a small spring 7, a valve seat 9, a seal gasket ii 8, and an umbrella-shaped valve core 6. The large spring 11, the umbrella-shaped valve core 6 and the sealing gasket II 8 are sequentially arranged on the valve seat 9, and the small spring 7 is arranged on the umbrella-shaped valve core 6. The umbrella-shaped valve core 6 consists of an upper pressing sheet 61, a lower pressing sheet 62, a lip-shaped sealing gasket 63, a nut 64 and a screw 10. The lip seal 63 is tightened by the upper pressing piece 61 and the lower pressing piece 62 and fixed to the screw 10 by a nut 64.

The valve seat 9 is in a stepped shaft structure, 1 groove is arranged between a large cylinder and a small cylinder and used for mounting a sealing gasket II 8, a stepped hole is formed in the valve seat, a large hole 15 is used for mounting a large spring 11, a small hole is a guide hole 16, and 3 waist-shaped grooves 14 are formed in the lower end face of the valve seat and used as fluid passages of an upper cavity and a lower cavity.

The cavity formed by the upper cylinder 1 and the valve seat 9 is an upper cavity, the pressure is P1, and the force-bearing area is A1.

The cavity formed by the lower cylinder 2 and the valve seat 9 is a lower cavity, the pressure is P2, and the force-bearing area is A2.

The pre-tightening pressure of the large spring 11 is F1, and the pre-tightening pressure of the small spring 7 is F2.

The large constant pressure valve is composed of a lower cylinder body 2, a sealing gasket II 8, a valve seat 9 and a large spring 11.

The small constant pressure valve is composed of a valve seat 9, an umbrella-shaped valve core and a small spring 7.

The lower chamber pressure P1 is determined by the pre-compression force F1 of the large spring and the force-bearing area a1 of the gasket ii 8.

The upper chamber pressure P2 is determined by the pre-compression force F2 of the small spring and the force-receiving area a2 of the lip seal 63.

1 small hole on the upper cylinder body 1, the guide hole of the lower cylinder body 2 and the small hole of the step hole on the valve seat 9, wherein the 3 holes are guide holes and are used for fixing the screw rod 10 and ensuring that the valve seat 9 moves up and down on the screw rod 10.

The screw 10 can be pushed by hand and is used for pushing the umbrella-shaped valve core 6 to release pressure manually in emergency.

The invention adopts the structural form of the upper cylinder body 1, the lower cylinder body 2 and the valve seat 9 to replace the traditional 2 overflow valves to set different pressures, thereby reducing the fluctuation range of differential pressure.

The specific embodiments are merely illustrative of the invention and are not intended to be limiting. The fluid in this embodiment refers to a mixture of gas, liquid and vapor-liquid.