CN206310133U - Single tube pressure test quick connector - Google Patents

Abstract

The utility model provides a single-tube pressure test quick connector, which comprises a cylinder, a piston, a seal head, a clamping mechanism and a connecting tube; the piston, the end socket and the clamping mechanism are arranged in the cylinder body, the clamping mechanism and the end socket are respectively arranged at two ends of an inlet and an outlet of the cylinder body, the piston is arranged between the end socket and the clamping mechanism, the connecting pipe penetrates through the end socket and is connected with the inlet end of the piston, a water outlet is arranged on the connecting pipe, a sealing cavity is defined by the inner walls of the piston, the end socket and the cylinder body, and the water outlet is positioned in the sealing cavity; the thickness of the inner wall of the cylinder body close to the outlet end of the cylinder body is gradually reduced from the outlet end to the inside of the cylinder body to form a cylinder body conical surface; the clamping mechanism is arranged at the outlet end of the cylinder and is a round table which is formed by a plurality of clamping blocks in a surrounding mode and provided with a clamping opening, the round table is inserted into the outlet end of the cylinder and is in adaptive fit with the conical surface of the cylinder and then is embedded with the piston, the pressure test tube penetrates through the clamping opening to be connected with the outlet end of the piston, the connecting tube is pulled, the piston slides left and right along the cylinder and drives the clamping opening of the conical body to tighten or enlarge, and then the conical body is controlled to be clamped or loosened.

Description

Single tube pressure test quick connector

technical field

The utility model relates to a quick plug connection device for pressure testing of heat exchanger tube bundles.

Background technique

Daqing Petrochemical Machinery Factory mainly produces tube bundle heat exchangers. The average annual production of heat exchanger tube bundles is about 100,000. A large number of tube bundles need to be tested for leaks with high-pressure water after simmering. Generally, pressure tests are performed according to the requirements of heat exchange capacity. The pressure is between 5Mpa and 15Mpa, and the pressure test has been carried out by means of welded connection of pressure test tubes: that is, a single tube bundle is welded in a "head-to-tail" manner, and after multiple groups of tube bundles form a sealed cavity, it is finally connected to a high-pressure water pump for pressure. After the pressure test is completed, it is necessary to cut the ends of each welded tube bundle, disconnect them one by one, and reprocess the tube heads to meet the service conditions, and proceed to the next process. Among them, there are many problems in this pressure test method: 1. The welding process of the tube bundle is very demanding and the efficiency is extremely low; 2. After the pressure test, the cutting is damaged, resulting in waste of materials. Each heat exchange tube must be reserved for processing with a length of more than 100 mm. 3. After cutting, the high temperature of the pipe head after cutting makes reprocessing difficult; 4. The whole pressure test process is cumbersome and complicated, time-consuming and labor-intensive, costing people and money. This process seriously affects the manufacturing period of the equipment, so the appearance of a good tube bundle pressure test tool is imminent.

Utility model content

In order to solve the time-consuming and labor-intensive problems in the traditional pressure test method of tube bundles, Daqing Petrochemical Machinery Factory organized technical personnel to develop and manufacture a single-tube pressure test quick joint, which greatly improved the efficiency of single-tube pressure test .

The utility model provides a single-pipe pressure test quick joint, including: a cylinder body, a piston, a head, a clamping mechanism, and a connecting pipe;

The piston, head and clamping mechanism are arranged in the cylinder body, the clamping mechanism and the head are arranged at both ends of the inlet and outlet of the cylinder, the piston is arranged between the head and the clamping mechanism, and the connecting pipe passes through the head and the The inlet end of the piston is connected, and the connecting pipe is provided with a water outlet. The piston, the head, and the inner wall of the cylinder form a sealed cavity, and the water outlet is located in the sealed cavity;

The thickness of the inner wall of the cylinder close to the outlet end of the cylinder gradually decreases from the outlet end to the inside of the cylinder to form a cone surface of the cylinder; the clamping mechanism is a round table with a jaw formed by a plurality of clamping blocks, The round table is inserted into the cylinder body and adapted to match the cone surface of the cylinder body, and then fitted with the piston, the pressure test tube is connected to the outlet end of the piston through the clamp, and the connecting tube is pulled left and right, and the piston is driven by the connecting tube along the left and right sides of the cylinder body. Slide and drive the jaw of the cone to tighten or enlarge, and then control the cone to clamp or loosen the pressure test tube.

The single-pipe pressure test quick connector is characterized in that the quick connector further includes a push piece, and the push piece is arranged between the head and the piston and abuts against the piston.

The single-tube pressure test quick connector is characterized in that the pushing member is a spring member.

The single-tube pressure test quick connector is characterized in that a handle is provided on the cylinder body, and the handle is fixed on the inlet end of the cylinder body.

The single-tube pressure test quick connector is characterized in that the handle includes a handle handle, a fixed piece connected with the handle handle and provided with a mounting hole, the fixed piece cover is arranged on the inlet end of the cylinder body, and the handle handle is fixed along the The sheet extends obliquely upwards, and the angle between the handle handle and the fixed sheet is 95-105 degrees.

The single-pipe pressure test quick joint is characterized in that the round table is a detachable round table surrounded by four clamping blocks, and the clamping mouth runs through the center of the round table.

The single tube pressure test quick joint is characterized in that the radius of the bottom surface of the round platform is greater than the radius of the top surface, and an annular groove and an annular flange are provided along the circumference of the round platform near the bottom surface of the round platform.

The single-tube pressure test quick connector is characterized in that the piston includes a piston top and a piston skirt integrally formed and connected with the piston top, and an annular locking groove is provided between the piston top and the piston skirt. The top of the piston is embedded in the annular groove, the annular flange is snapped into the annular groove, the top of the piston is provided with a first groove, and the first groove extends from the top of the piston To the piston skirt and communicate with the second groove provided on the piston skirt through a channel, the inner surface of the first groove is provided with a first seal ring groove circumferentially, and the outer circumference of the piston skirt is provided with a second The sealing ring groove, the first sealing ring groove and the second sealing ring groove are all provided with sealing rings.

The single-tube pressure test quick connector is characterized in that an accommodating cavity is provided at the head end close to the piston, and the spring part is partially snapped into the accommodating cavity.

The single-tube pressure test quick joint is characterized in that a third sealing ring groove is provided on the outer side of the head, a fourth sealing ring groove is provided on the inner wall of the head, and the third sealing ring groove and the fourth sealing ring groove are arranged on the sealing ring. At opposite ends of the head, the third sealing ring groove is set corresponding to the accommodating cavity.

The beneficial effects of the utility model are: the quick connector has been tested in the actual production of Daqing Petrochemical Machinery Factory, and the use effect is good, omitting the procedures of single-pipe welding, multi-pipe cutting and pipe head reprocessing, and improving production efficiency Nearly 50 times, the manufacturing period of the equipment is shortened, the production cost is greatly reduced (the pressure test cost of each pipe is below 0.2 yuan), and the labor intensity of the workers is greatly reduced at the same time.

Description of drawings

Figure 1 is a schematic diagram of the structure of a single-pipe pressure test quick connector.

Wherein reference sign is:

Barrel 1

Piston 11

Piston skirt 111

Second sealing ring groove 1111

Ring slot 1112

Piston top 112

First sealing ring groove 1121

sealed chamber 113

Head 12

push piece 121

Accommodating cavity 122

The third sealing ring groove 123

Fourth sealing ring groove 124

Sealing ring 125

Clamping mechanism 13

Jaw 131

Annular groove 132

Ring flange 133

Cylinder cone 14

connecting pipe 2

Outlet 21

handle 3

handle handle 31

Fixed sheet 32

Pressure test tube 4

detailed description

The single-tube pressure test quick joint provided by the utility model, as shown in Fig. 1 , includes: a cylinder body 1, a connecting pipe 2, a piston 11, a sealing head 12, a pushing member 121, a clamping mechanism 13, and a handle 3.

The cylinder body 1 is provided with a piston 11, a sealing head 12, and a clamping mechanism 13. The clamping mechanism 13 and the sealing head 11 are respectively arranged at both ends of the inlet and outlet of the cylinder body, and the sealing head 12 is screwed on the inlet end of the cylinder body. The tightening mechanism 13 is embedded on the outlet end of the barrel, the piston 11 is arranged between the head 12 and the clamping mechanism 13, the connecting pipe passes through the head to connect with the piston inlet, and the pressure test tube 4 passes through the clamping mechanism to connect with the piston outlet. The thickness of the inner wall of the cylinder 1 near the outlet end gradually decreases from the outlet end to the inside of the cylinder 1 to form a cone 14 of the cylinder. The clamping mechanism 13 is a round platform with jaws formed by four clamping blocks. The jaws 131 Through the center of the round table, the radius of the bottom surface of the round table is greater than the radius of the top surface, the round table is inserted into the entrance of the cylinder body 1 and connected with the tapered surface 14 of the cylinder body, the bottom surface of the round table is fitted with the piston 11, the clamping mechanism 13, the piston 11, and the head 12 , The connecting pipe 2 is connected into one body.

The radius of the bottom surface of the circular platform is greater than the radius of the top surface, and the circular platform near the bottom surface is recessed inward along the circumferential direction to form an annular groove 132 and an annular flange 133 . The piston 11 includes a piston top 112, a piston skirt 111 integrally formed with the piston top 112, an annular snap groove 1112 is arranged between the piston top 112 and the piston skirt, the piston top 112 is embedded in the annular groove 132, and the ring The shaped flange 133 is snapped into the annular slot for tight engagement of the clamping mechanism with the piston. The piston is provided with a first groove and a second groove. The piston top 112 is provided with a first groove. The first groove extends from the piston top 112 to the piston skirt 111 and the second groove arranged on the piston skirt. Connected by a channel, the inner surface of the first groove is provided with a first sealing ring groove 1121 in the circumferential direction, and the outer circumference of the piston skirt 111 is provided with a second sealing ring groove 1111, and both the first sealing ring groove and the second sealing ring groove are provided with sealing rings. ring. Open an annular groove 132 along the circumferential direction inside the round platform. The annular groove 132 is close to the bottom surface. In the groove 132, the annular flange 133 in the round table is snapped into the annular groove 1112, the clamping mechanism is fitted with the piston, the pressure test tube 4 passes through the jaw 131 and snaps into the first groove, and the connecting pipe passes through The over-head is snapped into the second groove, and the water pressure from the sealing chamber is transmitted to the pressure test tube through the channel, which is especially important for the sealing of the sealing chamber. There are sealing grooves at the head and the piston.

The sealing head 12 provided by the utility model is a casing structure provided with an external thread portion at one end, and a pushing member 121 is arranged between the sealing head and the piston, and the pushing member 121 extends along the connecting pipe to the piston 11 and resists the piston 11, In the present utility model, the pushing member 121 is a spring, and an accommodating cavity is provided between the head end close to the piston and the connecting pipe, and part of the spring is arranged in the accommodating cavity. A third sealing ring groove 123 is provided on the outside of the head 12 in the circumferential direction, and a fourth sealing ring groove 124 is provided on the inner wall of the head 12 in the circumferential direction. The three sealing ring grooves 123 are arranged correspondingly to the housing cavity 122, the third sealing ring groove 123 and the fourth sealing ring groove 124 are equipped with sealing rings, the sealing head, the piston, the cylinder body 1 and the sealing rings arranged on the sealing head and the piston formed sealed chamber.

One end of the connecting pipe 2 is connected to the piston skirt 111, and the other end of the connecting pipe 2 is connected to a high-pressure pump (not shown). cavity. The pressure test tube 4 passes through the jaw 131 to connect with the top of the piston 112. Since the connecting tube and the piston 11 are fixed as one, the connecting tube is pulled left and right, and the piston 11 slides left and right along the barrel 1 and drives the jaw 131 of the cone to tighten. Or enlarge, and then control the cone to loosen or clamp the pressure test tube 4.

The handle 3 is arranged on the cylinder body 1 , and the handle 3 is fixed on the inlet end of the cylinder body 1 . The handle 3 includes a handle handle 31 and a fixed piece 32 provided with a mounting hole. The fixed piece 32 is arranged at the inlet end face of the cylinder body 1. The handle handle 31 extends obliquely upward along the fixed piece 32. The handle handle 31 and the fixed piece 32 The included angle is 95-105 degrees.

The working principle of this device is as follows, mainly using the pressure of the pressure test medium (clear water) to tighten the pressure test tube 4 to prevent detachment (the greater the pressure of the medium, the greater the clamping force of the clamping block), and the seal made of special materials It is designed on the principle of ring pressure guaranteeing no leakage. The water flow from the high-pressure water pump is injected into the sealing chamber 113 through the two water outlets 21 on the connecting pipe, and the other part is directly injected into the piston 11 through the connecting pipe 2. As the pressure increases, the pressurized medium in the sealing chamber 113 pushes the piston 11 Move the clamp block to the outside of the cylinder body 1, tighten the clamp block under the reaction force of the cone surface 14 of the cylinder body, clamp the pressure test tube 4 to prevent it from falling out, and complete the pressure test after maintaining the pressure for a specified time.

The key components of the quick connector provided by this device are that the piston 11 and the head 12 are arranged at the outlet and inlet of the cylinder 1, the second seal ring groove 1111 on the piston 11, the first seal ring groove 1121 and the seal head 12 The third sealing ring groove 123, the fourth sealing ring groove 124, the first sealing ring groove 1121, the second sealing ring groove 1111, the third sealing ring groove 123, and the fourth sealing ring groove 124 are equipped with sealing rings. The ring is made of special material, and its function is to withstand the pressure of the high-pressure medium. Four sets of sealing rings are used, one is to ensure the dynamic seal between the head 12, the piston 11 and the cylinder body 1, and the other is to ensure the connection between the connecting pipe 2 and the head 12. The third is to ensure the static seal between the piston 11 and the pressure test tube 4; thereby ensuring that the pressure from the connecting pipe 2 is transmitted to the pressure test tube 4.

The number of pressure test tubes 4 to be tested is huge, and improving the test speed is the key. One of the key components of the quick connector provided by this device is a clamping piece 131 formed by setting a plurality of clamping blocks at the outlet end of the cylinder body 1. Round table, when testing, insert the pressure test tube 4 into the jaw 131, when the connecting tube 2 is moved, the piston 11 can move horizontally in the cylinder 1, and the clamp can be dragged to enlarge or tighten the jaw 131, in detail When testing the pressure test tube 4, grasp the handle with one hand and push the connecting tube 2 to the left with the other hand. Under the push of the spring, the seal head 12 and the clamp block pre-clamp the pressure test tube 4 inserted into the seal head 12, and the test is completed Finally, hold the handle with one hand, and pull the connecting pipe 2 outward with the other hand. The connecting pipe 2 drives the piston 11 to move to the right, and then drives the round table to move to the right. , so that the jaw 131 loosens the pressure test tube 4, thereby taking out the pressure test tube 4.

Claims (10)

1. Single-pipe pressure test quick connector, characterized in that it includes a cylinder, a piston, a head, a clamping mechanism, and a connecting pipe; The piston, head and clamping mechanism are arranged in the cylinder body, the clamping mechanism and the head are arranged at both ends of the inlet and outlet of the cylinder, the piston is arranged between the head and the clamping mechanism, and the connecting pipe passes through the head Connected to the inlet end of the piston, the connecting pipe is provided with a water outlet, the piston, the head, and the inner wall of the cylinder form a sealed cavity, and the water outlet is located in the sealed cavity; The thickness of the inner wall of the cylinder close to the outlet end of the cylinder gradually decreases from the outlet end to the inside of the cylinder to form a cone surface of the cylinder; the clamping mechanism is a round table with a jaw formed by a plurality of clamping blocks, The round table is inserted into the cylinder body and adapted to match the cone surface of the cylinder body, and then fitted with the piston, the pressure test tube is connected to the outlet end of the piston through the clamp, and the connecting tube is pulled left and right, and the piston is driven by the connecting tube along the left and right sides of the cylinder body. Slide and drive the jaw of the cone to tighten or enlarge, and then control the cone to clamp or loosen the pressure test tube. 2 . The single-pipe pressure test quick connector according to claim 1 , wherein the quick connector further comprises a pushing member, and the pushing member is arranged between the head and the piston and abuts against the piston. 3 . 3. The single tube pressure test quick connector according to claim 2, wherein the pushing member is a spring member. 4. The single tube pressure test quick connector according to claim 1, characterized in that a handle is provided on the barrel, and the handle is fixed at the inlet end of the barrel. 5. The single-tube pressure test quick connector according to claim 4, wherein the handle includes a handle handle, a fixed piece connected with the handle handle and provided with a mounting hole, and the fixed piece cover is arranged on the inlet end of the cylinder body , the handle handle extends obliquely upward along the fixed piece, and the angle between the handle handle and the fixed piece is 95-105 degrees. 6. The single-pipe pressure test quick joint according to claim 1, wherein the round table is a detachable round table, which is formed by four clamping blocks, and the clamp mouth runs through the center of the round table. 7. The single tube pressure test quick joint according to claim 6, wherein the radius of the bottom surface of the round platform is greater than the radius of the top surface, and an annular groove and an annular flange are provided along the circumference of the round platform near the bottom surface of the round platform. 8. The single-tube pressure test quick connector according to claim 7, wherein the piston comprises a piston top and a piston skirt integrally formed with the piston top, and the gap between the piston top and the piston skirt is An annular groove is provided, the top of the piston is embedded in the annular groove, the annular flange is inserted into the annular groove, a first groove is arranged in the top of the piston, and the first groove Extending from the top of the piston to the piston skirt and communicating with the second groove provided on the piston skirt through a channel, the inner surface of the first groove is circumferentially provided with a first seal ring groove, the piston skirt A second sealing ring groove is arranged on the outer circumference, and sealing rings are arranged in the first sealing ring groove and the second sealing ring groove. 9 . The single-tube pressure test quick connector according to claim 3 , wherein an accommodating cavity is provided at one end of the head close to the piston, and the spring part is partially snapped into the accommodating cavity. 10 . 10. The single-pipe pressure test quick joint according to claim 9, wherein a third sealing ring groove is provided on the outside of the head, a fourth sealing ring groove is provided on the inner wall of the head, the third sealing ring groove, the fourth sealing ring groove The sealing ring grooves are arranged at opposite ends of the head, and the third sealing ring groove is arranged corresponding to the accommodating cavity.