Safety valve for high-pressure metering pump

Abstract

The utility model relates to the technical field of safety valves, and discloses a safety valve for a high-pressure metering pump, which comprises a valve body, and a mounting mechanism is arranged in the valve body. According to the safety valve for the high-pressure metering pump, the spring sleeve, the adjusting screw, the liquid drainage hole, the spring, the spring seat, the valve sleeve, the valve element and the baffle are arranged, the spring seat is limited through the baffle, the spring is prevented from losing efficacy after the spring seat topples over, the adjusting screw is rotated, the pre-tightening force of the spring is adjusted, an opening of the safety valve is changed to be upward, and two threads are additionally arranged for one type; two ends of the pipe can be directly connected, the pipe can be used without flanges, field installation and management are very convenient, and elbows and cushion blocks can be omitted; by arranging a sealing ring and a sealing ring, the outer surface of the spring sleeve and the inner wall of the valve seat are sealed through the sealing ring, high-pressure liquid is prevented from leaking from a third groove in the top of the valve body, and after the connecting pipes are installed on the two sides of the valve body, the outer surfaces of the connecting pipes and the inner wall of the valve seat are sealed through the sealing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a safety valve for a high-pressure metering pump. Background Technique

[0002] A metering pump, also known as a proportional pump, can conveniently and accurately change the stroke of the plunger by adjusting the eccentricity of the eccentric wheel when the delivered liquid volume changes. When the internal pressure of the pipeline is relatively high, a safety valve is required to relieve the pressure inside the pipeline. The safety valve is in a normally closed state under the action of the spring force of the closing member. When the medium pressure in the equipment or pipeline rises above the specified value, it prevents the medium pressure in the pipeline or equipment from exceeding the specified value by discharging the medium to the outside of the system. The safety valve belongs to the category of automatic valves and is mainly used in liquid delivery pipelines such as hydraulic systems and polyurethanes to control the pressure not to exceed the specified value, playing an important role in protecting personal safety and equipment operation. Note that the safety valve must undergo a pressure test before it can be used.

[0003] Due to the high-pressure pump with a magnetic coupling structure, due to the shielding of the pump body and the magnetic coupling, for the safety valve module with a conventional structure, when selecting, it is divided into two models, left and right. In addition, it is necessary to add an iron block to a higher height before installation.

[0004] However, it still has the following disadvantages: The safety valve module with a conventional structure can only be installed in a fixed direction. Due to the lengthening of the pipeline, the pipeline connection is also very troublesome, and the bolt installation is easily blocked, making it difficult to install the bolts. For this reason, we propose a safety valve for a high-pressure metering pump to solve this problem. Content of the Utility Model

[0005] The purpose of the utility model is to provide a safety valve for a high-pressure metering pump to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A safety valve for a high-pressure metering pump, including a valve body, a pressure relief hole is opened on the right end face of the valve body, a third groove is opened on the top surface of the valve body, a second groove is opened on the inner wall of the third groove, a first groove is opened on the inner wall of the second groove, a liquid guide hole is opened on the left end face of the valve body, and the inside of the liquid guide hole is communicated with the inside of the first groove;

[0007] The installation mechanism includes a spring sleeve, an adjusting screw, a spring, a spring seat, a valve sleeve and a valve core. Drainage holes are opened on the outer surface of the spring sleeve. A first through hole is opened on the left end face of the valve sleeve, and a second through hole is opened on the top surface of the valve sleeve. The inside of the first through hole is communicated with the inside of the second through hole. The top end of the spring is sleeved on the outer surface of the bottom end of the adjusting screw, and the bottom end of the spring is sleeved on the outer surface of the top end of the spring seat. The bottom outer surface of the valve core extends into the valve sleeve, and the outer surface of the adjusting screw is threadedly connected with the inner wall of the spring sleeve.

[0008] A further improvement is that the installation mechanism further includes a sealing ring, a baffle, a U-shaped rod, a limiting block and a sealing ring. A docking groove is formed on the bottom surface of the spring seat. The top end of the valve core extends into the spring seat and is adapted to the inner wall of the spring seat. By using the elastic force of the spring, after the outer surface of the valve core is squeezed against the inner wall of the valve sleeve, it can prevent leakage from the pressure relief hole when the liquid oil pressure inside the pipeline is relatively low.

[0009] A further improvement is that the baffle is fixedly sleeved on the outer surface of the valve core. The diameters of both the baffle and the spring seat are smaller than the inner diameter of the bottom end of the spring sleeve. By providing the baffle, it is convenient to limit the spring seat and prevent the spring from failing when the spring seat topples over.

[0010] A further improvement is that the outer surface of the spring sleeve is threadedly connected to the inside of the third groove. The bottom surface of the spring sleeve is in pressing contact with the top surface of the valve sleeve. The outer surface of the valve sleeve is in pressing contact with the inner wall of the second groove. The valve sleeve can be installed and positioned by rotating the spring sleeve.

[0011] A further improvement is that the outer surface of the bottom end of the valve core is slidably connected to the inner wall of the second through hole. The diameter of the middle part of the valve core is smaller than the inner diameter of the second through hole. The outer surface diameter of the bottom end of the valve sleeve is smaller than the inner diameter of the first groove. When the liquid oil pressure on the inner wall of the pipeline is relatively high, the liquid flows upward between the outer surface of the valve core and the inner wall of the valve sleeve.

[0012] A further improvement is that the sealing ring is arranged inside the third groove. The top surface of the sealing ring is in pressing contact with the outer surface of the spring sleeve. The bottom surface of the sealing ring is in pressing contact with the inner wall of the third groove. The outer surface of the sealing ring is fixedly connected to the inner wall of the valve body. Internal threads are provided on the inner wall of the liquid guiding hole. By providing the sealing ring, it is convenient to seal between the outer surface of the spring sleeve and the inner wall of the valve sleeve and prevent liquid from leaking from the top of the valve body. The sealing ring is used to seal between the connecting pipe and the inner wall of the valve body.

[0013] A further improvement is that the bottom end of the U-shaped rod is hinged to the top surface of the adjusting screw. The bottom surface of the limiting block is fixedly connected to the top surface of the U-shaped rod. A limiting groove is formed on the inner wall of the spring sleeve. The outer surface of the limiting block is adapted to the inner wall of the limiting groove. The adjusting screw can be adjusted or limited by the U-shaped rod and the limiting block.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: for the safety valve of the high-pressure metering pump, by setting a spring sleeve, an adjusting screw, a drain hole, a spring, a spring seat, a valve sleeve, a first through hole, a second through hole, a valve core and a baffle plate, the baffle plate is used to limit the spring seat to prevent the spring from failing after the spring seat topples over. By rotating the adjusting screw, the pre-tightening force of the spring is adjusted. The opening of the safety valve is changed to face upward. Two new threads are added to one model, and the pipes can be directly connected at both ends, and it can be used without a flange, which is very convenient for on-site installation and management, and elbows and pads can be saved; by setting a sealing ring and a sealing ring, the sealing ring is used to seal the outer surface of the spring sleeve and the inner wall of the valve seat to prevent high-pressure liquid from leaking from the third groove at the top of the valve body. After the connecting pipe is installed on both sides of the valve body, the sealing ring is used to seal the outer surface of the connecting pipe and the inner wall of the valve seat; by setting a U-shaped rod and a limiting block, rotating the U-shaped rod can drive the adjusting screw to rotate, and the pre-tightening force of the spring can be adjusted. After the rotation is completed, the U-shaped rod is placed flat so that the limiting block is adapted to the limiting groove inside the spring sleeve to prevent the adjusting screw from rotating due to vibration during use. Description of the Drawings

[0015] Figure 1 is a three-dimensional schematic diagram of the overall structure of the utility model;

[0016] Figure 2 is a left-side schematic diagram of the valve body structure of the utility model;

[0017] Figure 3 is a cross-sectional view of the three-dimensional structure of the installation mechanism of the utility model;

[0018] Figure 4 is Figure 3 the enlarged view of the structure at A in

[0019] Figure 5 is a three-dimensional schematic diagram of the valve core structure of the utility model.

[0020] In the figure: 1 valve body, 3 installation mechanism, 301 spring sleeve, 305 adjusting screw, 3051 drain hole, 306 sealing ring, 307 spring, 308 spring seat, 309 valve sleeve, 3091 first through hole, 3092 second through hole, 310 valve core, 3101 baffle plate, 311 U-shaped rod, 312 limiting block, 313 sealing ring, 4 first groove, 5 second groove, 6 third groove, 7 pressure relief hole, 8 liquid guide hole. Detailed Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-5 , the present utility model provides a technical solution: a safety valve for a high-pressure metering pump, including a valve body 1. A pressure relief hole 7 is provided on the right end face of the valve body 1. A third groove 6 is provided on the top surface of the valve body 1. A second groove 5 is provided on the inner wall of the third groove 6. A first groove 4 is provided on the inner wall of the second groove 5. A liquid guide hole 8 is provided on the left end face of the valve body 1. The inside of the liquid guide hole 8 is communicated with the inside of the first groove 4. An installation mechanism 3 is provided inside the valve body 1;

[0023] The installation mechanism 3 includes a spring sleeve 301, an adjustment screw 305, a spring 307, a spring seat 308, a valve sleeve 309 and a valve core 310. Drain holes are provided on the outer surface of the spring sleeve 301. A first through hole is provided on the left end face of the valve sleeve 309. A second through hole is provided on the top surface of the valve sleeve 309. The inside of the first through hole is communicated with the inside of the second through hole. The top end of the spring 307 is sleeved on the outer surface of the bottom end of the adjustment screw 305. The bottom end of the spring 307 is sleeved on the outer surface of the top end of the spring seat 308. The installation mechanism 3 further includes a sealing ring 306, a baffle 3101, a U-shaped rod 311, a limit block 312 and a sealing ring 313. The bottom outer surface of the valve core 310 extends into the valve sleeve 309. The outer surface of the adjustment screw 305 is threadedly connected with the inner wall of the spring sleeve 301;

[0024] The outer surface of the spring sleeve 301 is threadedly connected with the inside of the third groove 6. The bottom surface of the spring sleeve 301 is in pressing contact with the top surface of the valve sleeve 309. The outer surface of the valve sleeve 309 is in pressing contact with the inner wall of the second groove 5. A docking groove is provided on the bottom surface of the spring seat 308. The top end of the valve core 310 extends into the spring seat 308 and is adapted to the inner wall of the spring seat 308. The baffle 3101 is fixedly sleeved on the outer surface of the valve core 310. The diameters of both the baffle 3101 and the spring seat 308 are smaller than the inner diameter of the bottom end of the spring sleeve 301;

[0025] The outer surface of the bottom end of the valve core 310 is slidably connected to the inner wall of the second through hole 3209. The diameter of the middle part of the valve core 310 is smaller than the inner diameter of the second through hole 3209. The outer surface diameter of the bottom end of the valve sleeve 309 is smaller than the inner diameter of the first groove 4. By providing a spring sleeve 301, an adjusting screw 305, a drain hole 3051, a spring 307, a spring seat 308, a valve sleeve 309, a first through hole 3091, a second through hole 3092, a valve core 310 and a baffle 3101, the baffle 3101 is used to limit the spring seat 308 to prevent the spring from failing after the spring seat 308 topples over. By rotating the adjusting screw 305, the pre-tightening force of the spring 307 is adjusted. The opening of the safety valve is changed to face upward. Two new threads are added to one model, and the pipes can be directly connected at both ends, and it can be used without a flange, which is very convenient for on-site installation and management, and elbows and pads can be saved;

[0026] The sealing ring 306 is arranged inside the third groove 6. The top surface of the sealing ring 306 is in extrusion contact with the outer surface of the spring sleeve 301, and the bottom surface of the sealing ring 306 is in extrusion contact with the inner wall of the third groove 6. The outer surface of the sealing ring 313 is fixedly connected to the inner wall of the valve body 1. Internal threads are provided on the inner wall of the liquid guide hole 8. By providing the sealing ring 306 and the sealing ring 313, the outer surface of the spring sleeve 301 and the inner wall of the valve seat 1 are sealed by the sealing ring 306 to prevent high-pressure liquid from leaking from the third groove 6 at the top of the valve body 1. After the connecting pipes are installed on both sides of the valve body 1, the outer surface of the connecting pipes and the inner wall of the valve seat 1 are sealed by the sealing ring 313;

[0027] The bottom end of the U-shaped rod 311 is hinged to the top surface of the adjusting screw 305. The bottom surface of the limiting block 312 is fixedly connected to the top surface of the U-shaped rod 311. A limiting groove is provided on the inner wall of the spring sleeve 301, and the outer surface of the limiting block 312 is adapted to the inner wall of the limiting groove. By providing the U-shaped rod 311 and the limiting block 312, rotating the U-shaped rod 311 can drive the adjusting screw 305 to rotate, and thus the pre-tightening force of the spring 307 can be adjusted. After the rotation is completed, the U-shaped rod 311 is laid flat so that the limiting block 312 is adapted to the limiting groove inside the spring sleeve 301 to prevent the adjusting screw 305 from rotating due to vibration during use.

[0028] During use, when the liquid oil pressure inside the liquid guide hole 8 is relatively high, the liquid pushes the valve core 310 to move upward. The valve core 310 compresses the spring 307 through the spring seat 308. The liquid passes through the first through hole 3091 and the second through hole 3092 and enters the inside of the spring sleeve 301, and then the liquid passes through the drain hole 3051 and the pressure relief hole 7 and is discharged to the right.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety valve for a high-pressure metering pump, comprising a valve body (1), characterized in that: The right end surface of the valve body (1) is provided with a pressure relief hole (7), the top surface of the valve body (1) is provided with a third groove (6), the inner wall of the third groove (6) is provided with a second groove (5), the inner wall of the second groove (5) is provided with a first groove (4), the left end surface of the valve body (1) is provided with a liquid guide hole (8), the interior of the liquid guide hole (8) is connected with the interior of the first groove (4), and the interior of the valve body (1) is provided with a mounting mechanism (3); The mounting mechanism (3) comprises a spring sleeve (301), an adjusting screw (305), a spring (307), a spring seat (308), a valve sleeve (309) and a valve core (310). A drainage hole is provided on the outer surface of the spring sleeve (301), a first through hole is provided on the left end surface of the valve sleeve (309), a second through hole is provided on the top surface of the valve sleeve (309), the interior of the first through hole is connected to the interior of the second through hole, the top end of the spring (307) is sleeved on the outer surface of the bottom end of the adjusting screw (305), the bottom end of the spring (307) is sleeved on the outer surface of the top end of the spring seat (308), the outer surface of the bottom end of the valve core (310) extends to the inside of the valve sleeve (309), and the outer surface of the adjusting screw (305) is threadedly connected to the inner wall of the spring sleeve (301).

2. A safety valve for a high-pressure metering pump according to claim 1, characterized in that: The mounting mechanism (3) further comprises a sealing ring (306), a baffle (3101), a U-shaped rod (311), a limit block (312) and a sealing ring (313); a docking groove is provided on the bottom surface of the spring seat (308); and the top end of the valve core (310) extends into the interior of the spring seat (308) and is adapted to the inner wall of the spring seat (308).

3. A safety valve for a high-pressure metering pump according to claim 2, characterized in that: The baffle (3101) is fixedly sleeved on the outer surface of the valve core (310), and the diameter of the baffle (3101) and the diameter of the spring seat (308) are both smaller than the diameter of the inner wall of the bottom end of the spring sleeve (301).

4. A safety valve for a high-pressure metering pump according to claim 1, characterized in that: The outer surface of the spring sleeve (301) is threadedly connected to the inside of the third groove (6), the bottom surface of the spring sleeve (301) is in compression contact with the top surface of the valve sleeve (309), and the outer surface of the valve sleeve (309) is in compression contact with the inner wall of the second groove (5).

5. A safety valve for a high-pressure metering pump according to claim 1, characterized in that: The outer surface of the bottom end of the valve core (310) is slidably connected to the inner wall of the second through hole (3209), the middle diameter of the valve core (310) is smaller than the inner diameter of the second through hole (3209), and the outer surface diameter of the bottom end of the valve sleeve (309) is smaller than the inner wall diameter of the first groove (4).

6. A safety valve for a high-pressure metering pump according to claim 2, characterized in that: The sealing ring (306) is arranged inside the third groove (6); the top surface of the sealing ring (306) is in compression contact with the outer surface of the spring sleeve (301); the bottom surface of the sealing ring (306) is in compression contact with the inner wall of the third groove (6); the outer surface of the sealing ring (313) is fixedly connected to the inner wall of the valve body (1); and the inner wall of the liquid guide hole (8) is provided with an internal thread.

7. A safety valve for a high-pressure metering pump according to claim 2, characterized in that: The bottom end of the U-shaped rod (311) is hinged to the top surface of the adjusting screw (305), the bottom surface of the limit block (312) is fixedly connected to the top surface of the U-shaped rod (311), the inner wall of the spring sleeve (301) is provided with a limit groove, and the outer surface of the limit block (312) is adapted to the inner wall of the limit groove.

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