CN102921821A - High-pressure liquid tube expanding device for fin arrangement - Google Patents

Abstract

The invention discloses a high-pressure liquid tube expanding device for fin arrangement. The device comprises a hydraulic pump, a high-pressure hose, a pipe switch, an overflow valve, a pressure gage, a joint, a seal pressure head and a base, wherein one end of the high-pressure hose is connected with the hydraulic pump, and the other end of the high-pressure hose is connected with the joint; the pipe switch, the overflow valve and the pressure gage are sequentially arranged between the hydraulic pump and the joint on the high-pressure hose; a through hole is opened in the center of the joint, and a thread is arranged at one end of the through hole which is in a threaded seal connection with the high-pressure hose through the thread; one end of the joint is fixed on the base, the other end is provided with a concave inner cavity, a groove is arranged in the concave inner cavity, and a seal ring is placed in the groove; a through hole is arranged in the center of the seal pressure head, and a fluted tube penetrates through the through hole and is fastened with the seal pressure head through a brazing mode; and the seal pressure head is arranged in the concave inner cavity of the joint, preferably, the seal pressure head is fixed on the joint. According to the device, the fluted tube is sealed, pressure control is achieved for hydraulic expansion forming, and the device is simple in structure, easy to achieve, and convenient and reliable in operate.

Description

A high-pressure liquid tube expansion device for fin installation

technical field

The invention relates to the technical field of hydraulic tube expansion, in particular to a simple high-pressure tube expansion device, which is used for clamping, fixing, sealing and expanding the grooved tube with fins.

Background technique

With the rapid development of petrochemical, electric power and other industries, the shell-and-tube heat exchange equipment has been widely used. The tube bundle of this type of heat exchange equipment is formed by connecting many heat transfer tubes and tube sheets. At present, the main use in our country is the mechanical expansion tube connection method. Due to the limitation of the pipe diameter and the length of the expander, the expansion depth and the total length of the expansion tube are not easy to be too large and the leakage rate at the end of the mechanical expansion tube is high. The quality of the expansion joint is completely determined by human factors. The requirements for the skills of the operator are very high and the operation intensity is high. Hydraulic pipe expansion is a pipe expansion method that uses hydraulic pressure as power, that is, by pouring high-pressure liquid into the casing to generate static and uniform internal pressure on the inner wall of the pipe to deform the pipe wall, and the deformation can be restored under the action of fluid fatigue load. Compared with mechanical expansion tubes, hydraulic expansion tubes have uniform expansion stress, large expansion length, large expansion pipe diameter, high work efficiency, stable expansion, and high process yield. The difficulty of hydraulic tube expansion lies in the process of tube expansion, the tube must be sealed well, no liquid leakage is allowed, and the pressure of the expansion joint must be well controlled at the same time. Therefore, it is of great significance to propose a simple and reliable high-pressure liquid tube expansion device.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art, and propose a high-pressure liquid tube expansion device for fin installation with no liquid leakage and good pressure control.

The invention seals the high-pressure liquid and the grooved pipe, uses the high-pressure liquid to expand the grooved pipe, and makes the surface closely connected with the fins. The structure is simple, easy to realize, and convenient and reliable to operate. The invention utilizes the sealing pressure head to squeeze the sealing ring to cause elastic deformation to isolate the internal environment of the pipeline from the external environment; and by adjusting the overflow valve, a certain pressure is stabilized to control the swelling result.

The purpose of the patent of the present invention is achieved through the following technical solutions:

A high-pressure liquid tube expansion device for fin installation, including a hydraulic pump, a high-pressure rubber hose, a pipeline switch, an overflow valve, a pressure gauge, a joint, a sealing pressure head and a base; one end of the high-pressure rubber hose is connected to the hydraulic pump, and the other end is connected to the joint; The high-pressure hose from the hydraulic pump to the joint is provided with a pipeline switch, a relief valve and a pressure gauge in sequence; a through hole is opened in the center of the joint, and one end of the through hole is provided with a thread, through which the thread is sealed with the high-pressure hose 2; One end of the joint is fixed on the base, and the other end is provided with a concave inner cavity, and a groove is arranged in the concave inner cavity, and a sealing ring is placed in the groove;

There is a through hole in the center of the sealing pressure head, and the grooved pipe passes through the through hole, and the sealing pressure head and the grooved pipe are fastened by brazing to realize seamless connection; the size of the through hole is determined according to the diameter of the grooved pipe; The pressure head is arranged in the concave inner cavity of the joint, and the sealing pressure head is fastened on the joint.

In order to further realize the purpose of the present invention, one end of the joint should be fixed on the base by bolt connection.

The sealing head is preferably fastened to the joint by screws.

The diameter of the through hole of the sealing pressure head is equal to the outer diameter of the grooved pipe.

The groove is a ring groove; the size parameters of the groove can be adjusted according to the demand.

The sealing pressure head of the present invention is fastened on the joint by screws, a through hole is drilled at the center to match the grooved pipe, and the sealing pressure head and the grooved pipe are fastened by brazing to realize seamless connection. The size of the through hole is determined according to the diameter of the grooved pipe.

The base is used for fixing the joint and the grooved tube with fins, and at the same time prevents the grooved tube from flying out accidentally, which has a certain protective effect.

The dimensional parameters of the inner cavity groove of the joint can be adjusted according to requirements, and have a certain degree of flexibility.

Advantage and positive effect of the present invention:

(1) A high-pressure liquid tube expansion device for fin installation seals the grooved tube, and uses high-pressure liquid to expand the grooved tube to connect the fins. It has a simple structure, is easy to implement, and is convenient and reliable to operate.

(2) The present invention adopts brazing method to connect the sealing pressure head and the grooved pipe, the connection is firm and reliable, the sealing performance is good, and it is easy to realize. The size of the through hole is determined according to the diameter of the grooved pipe, which can realize the expansion joint of grooved pipes with different pipe diameters, and has certain flexibility.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the device embodiment of the present invention;

Figure 2 is an exploded view of the connecting element between the finned grooved pipe and the hydraulic pipeline;

Fig. 3 is a schematic diagram of the joint structure of the present invention.

Detailed ways

For a better understanding of the present invention, the present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in Figures 1 and 2, a high-pressure liquid tube expansion device for fin installation includes a hydraulic pump 1, a high-pressure rubber hose 2, a pipeline switch 3, an overflow valve 4, a pressure gauge 5, a joint 6, a sealing pressure head 7 and The base 8; one end of the high-pressure rubber hose 2 is connected to the hydraulic pump 1, and the other end is connected to the joint 6; the high-pressure rubber hose 2 between the hydraulic pump 1 and the joint 6 is provided with a pipeline switch 3, an overflow valve 4 and a pressure gauge 5 in sequence; As shown in Figure 3, there is a through hole in the center of the joint 6, and one end of the through hole is provided with a thread, through which the thread is tightly connected with the high-pressure rubber hose 2; one end of the joint 6 is fixed on the base 8 through bolt connection, and the other end is provided with a concave Shaped inner cavity, cooperates with sealing pressure head 7, is provided with groove 12 in concave shaped inner cavity, and groove 12 places sealing ring 11.

The center of sealing head 7 is provided with a through hole, and the grooved pipe 10 passes through the through hole. The diameter of the through hole of the sealing head 7 is preferably equal to the outer diameter of the grooved pipe 10, and the sealing head 7 is connected to the groove by brazing. The pipe 10 is fastened to achieve seamless connection; the size of the through hole is determined according to the diameter of the grooved pipe; the sealing head 7 is set in the concave inner cavity of the joint 6 and fastened to the joint 6 by screws; the sealing head 7 is used to Squeeze the sealing ring 11 to cause elastic deformation to isolate the internal environment of the pipeline from the external environment.

The base 8 is used for fixing the joint 6 and placing the grooved tube 10 with fins 9 , and at the same time prevents the grooved tube from flying out accidentally, which has a certain protective effect.

The groove 12 is preferably an annular groove 12; the size parameters of the groove 12 can be adjusted according to requirements, and have certain flexibility.

The present invention stabilizes a certain pressure by adjusting the overflow valve 4, and controls the expansion result.

The working process of the device of the present invention is as follows: artificially insert the fin 9 into the grooved tube 10, at one end of the grooved tube 10 opening, use the brazing method to tightly connect the sealing pressure head 7 with the grooved tube, then put it into the station, And tighten the sealing pressure head 7 to the sealing ring 11 on the joint 6 through screw fastening; start the hydraulic pump 1, open the pipeline switch 3, adjust the overflow valve 4 to a certain pressure, the pressure gauge 5 displays the pressure parameter, and keep 30- 60s, the hydraulic expansion is completed, and the disassembly completes the whole process.

The invention uses a high-pressure liquid tube expansion device for fin installation to seal the grooved tube, and uses high-pressure liquid to expand the grooved tube to connect the fins. The structure is simple, easy to realize, and convenient and reliable to operate.

The present invention uses a brazing method to connect the sealing pressure head with the grooved pipe, the connection is firm and reliable, the sealing performance is good, and it is easy to realize.

The size of the through hole of the sealing head 7 of the present invention is determined according to the pipe diameter of the grooved pipe, which can realize the expansion joint of grooved pipes with different pipe diameters, and has good flexibility.

In the device of the present invention, the high-pressure liquid is transported through the high-pressure rubber hose connected to the hydraulic pump, and the pipeline and each component are connected by pipe threads, and the connection method is firm, reliable and non-leakage; a sealing ring is added between the sealing pressure head and the contact surface of the joint , The plastic deformation of the sealing ring is used to prevent liquid leakage, and the structure is simple and reliable.

Claims (5)

1. a fin is installed and is used the highly pressurised liquid pipe-expanding device, it is characterized in that, comprises hydraulic pump, high-pressure rubber pipe, pipe switch, overflow valve, Pressure gauge, joint, sealing pressure head and base; High-pressure rubber pipe one end connecting fluid press pump, the other end is connected with joint; Be provided with successively pipe switch, overflow valve and Pressure gauge on the high-pressure rubber pipe between from the hydraulic pump to the joint; The joint center has through hole, and an end of through hole is provided with screw thread, is connected with the high-pressure rubber pipe thread seal by this screw thread; One end of joint is fixed on the base, and the other end is provided with the spill inner chamber, is provided with groove at the spill inner chamber, and groove is placed sealing ring;

Sealing pressure head center is provided with through hole, passes fluted tube in the through hole, and the employing brazing mode will seal pressure head and fluted tube is fastening, realizes seamless link; Clear size of opening is determined according to the fluted tube caliber; The sealing pressure head is arranged in the spill inner chamber of joint, and the envelope pressure head is fastened on the joint.

2. fin according to claim 1 is installed and is used the highly pressurised liquid pipe-expanding device, and it is characterized in that: an end of joint is fixed on the base by bolt-connection.

3. fin according to claim 1 is installed and use the highly pressurised liquid pipe-expanding device, it is characterized in that: seal pressure head by screw fastening on joint.

4. fin according to claim 1 is installed and used the highly pressurised liquid pipe-expanding device, it is characterized in that: the through-hole diameter of sealing pressure head equals the fluted tube external diameter.

5. a kind of fin according to claim 1 is installed and is used the highly pressurised liquid pipe-expanding device, and it is characterized in that: groove is the annulus groove.

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