Heat tracing cable watertight performance tester
By designing a heat-tracing cable watertight performance tester that includes a booster pump and cooling tube, the problems of long test cycles and complex and high low-temperature simulation in the existing test methods are solved, and fast and low-cost watertight performance and low-temperature resistance testing are achieved.
Patent Information
- Application Number
- CN202421531692.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The existing watertight performance testing methods for heat-tracing cables require a long test cycle and are complex and costly to simulate low-temperature environments.
A heat-tracing cable watertight performance tester is designed to increase the water pressure through a booster pump, shorten the test cycle, and simulate the low-temperature environment by adding ice cubes to the water tank, and combine it with cooling pipes to keep the equipment stable and reduce the testing cost.
It achieves a shortening of the watertight performance test cycle of heat-tracing cables, and at the same time conducts low-temperature testing under low temperature conditions, reducing operational complexity and cost.
Smart Images
Figure CN222825196U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of cable testing, in particular to a watertight performance tester for a heating cable. Background Art
[0002] The heating cable is heated by electric current, generating heat to supplement the heat lost by the insulation equipment, thereby maintaining or raising its temperature to the required level. In northern cities, due to the extremely low temperature in winter, domestic water in municipal pipelines is prone to freezing, so it needs to be heated by heating cables. At present, the heating cables on the market are placed in municipal pipelines to directly heat the water, and the number of inspections of the heating cables needs to be minimized throughout the winter. This requires the heating cable to have excellent watertightness. At present, one end of the heating cable is generally sealed and placed in a pipeline loop to simulate the water flow velocity in the municipal pipeline. The heating cable is flushed by the water flow. After a period of time, the heating cable is taken out to check whether there is water infiltration into the heating cable. Since the water pressure generated by the simulated flow velocity in the municipal pipeline is relatively low, a long test cycle is required to detect whether the watertightness of the heating cable meets the standard, and it is generally carried out at room temperature. If a low temperature environment needs to be simulated, the pipeline loop needs to be placed in a low temperature box for testing, which is not only complicated to operate, but also costly. Utility Model Content
[0003] The utility model aims to provide a watertight performance tester for a heating cable which can reduce the test cycle and perform low-temperature withstand voltage test at a relatively low cost.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a heating cable watertight performance tester, comprising: a bracket, a water tank, a booster pump and a water pump are arranged on the bracket, the water inlet ends of the booster pump and the water pump are connected to the water tank, a horizontal pipe is horizontally arranged on the bracket, a liquid inlet valve and a liquid outlet valve are respectively arranged at both ends of the horizontal pipe, the liquid inlet valve is connected to the water outlet end of the booster pump, the liquid outlet valve is connected to the water tank through the water outlet pipe, a plurality of vertical pipes are vertically connected on the horizontal pipe, a ball valve is arranged on the top of the vertical pipe, and a pressure self-locking valve is arranged on the ball valve. The pressure-bearing self-locking valve comprises: a valve seat connected to a ball valve, a tapered hole is arranged in the valve seat, a plastic tapered sleeve is slidably clamped in the tapered hole, a step hole is arranged in the plastic tapered sleeve, a sealing rubber sleeve is arranged in the step hole, an external thread section is extended on the plastic tapered sleeve, a positioning sleeve is arranged on the valve seat, an internal thread is arranged in the positioning sleeve, the external thread section on the plastic tapered sleeve is threadedly connected with the internal thread of the positioning sleeve, a continuous cooling pipe is wound on the horizontal pipe and the vertical pipe, one end of the cooling pipe is connected to a water pump, and the other end of the cooling pipe extends into a water tank.
[0005] Furthermore, in the aforementioned heating cable watertight performance tester, a pressure gauge is provided on the booster pump and any vertical pipe.
[0006] Furthermore, in the aforementioned heating cable watertightness tester, temperature sensors are provided on the water tank and any vertical pipe.
[0007] Furthermore, in the aforementioned heating cable watertightness tester, the vertical pipe is connected to the bracket.
[0008] Furthermore, in the aforementioned heating cable watertight performance tester, a first clamp is provided at the connection between the horizontal pipe and the liquid inlet valve and the liquid outlet valve, a second clamp is provided at the connection between the vertical pipe and the ball valve, and a third clamp is provided at the connection between the valve seat and the ball valve.
[0009] Furthermore, in the aforementioned heating cable watertight performance tester, a positioning groove is coaxially arranged on the top wall of the valve seat, a plurality of threaded holes are evenly distributed circumferentially in the positioning groove, a plurality of connecting holes are evenly distributed circumferentially on the positioning sleeve, the positioning sleeve is clamped in the positioning groove, the connecting holes are aligned one by one with the threaded holes, and screws are threadedly connected in the relatively aligned connecting holes and threaded holes.
[0010] Furthermore, in the aforementioned heating cable watertight performance tester, the outer wall of the water tank is coated with a first thermal insulation cotton, an opening is opened on the top wall of the water tank, an insulation cover is covered on the opening, a feeding hole is provided on the insulation cover, and a cover plate is hinged on the feeding hole.
[0011] Furthermore, in the aforementioned heating cable watertight performance tester, the horizontal pipe and the vertical pipe are both coated with a second thermal insulation cotton, and the second thermal insulation cotton is also coated on the cooling pipe.
[0012] The utility model has the advantages that: after the water pressure in the horizontal pipe and the vertical pipe is increased to a level far higher than the water pressure generated by the water flow in the municipal pipeline by the booster pump, the test period of the watertight test of the heating cable can be shortened; when performing the watertight test, ice cubes can be added to the water tank to make the test water close to the water temperature in the municipal pipeline in winter, so that while performing the watertight test on the heating cable, the low-temperature resistance test can also be performed on the heating cable, and the cooling pipe can be used to ensure that the horizontal pipe and the vertical pipe are stably tested in a low-temperature environment, the structure is simple, and the test cost is low; when performing the test, the pressure-bearing self-locking valve locks the heating cable, and the pressure-bearing self-locking valve can improve its own sealing performance and the sealing performance of the heating cable after being subjected to the high water pressure in the vertical pipe, thereby preventing leakage due to loose sealing during the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 The utility model is a schematic diagram of the structure of the heating cable watertight performance tester.
[0014] Figure 2 yes Figure 1 Schematic diagram of the structure when viewed from above after removing the second thermal insulation cotton.
[0015] Figure 3 yes Figure 1 Schematic diagram of the structure in which the middle ball valve is connected to the pressure self-locking valve. DETAILED DESCRIPTION
[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.
[0017] like Figure 1 to Figure 3 As shown, the utility model of the heating cable watertight performance tester comprises: a bracket 1, a water tank 2, a booster pump 3 and a water pump 4 are arranged on the bracket 1, the outer wall of the water tank 2 is coated with a first thermal insulation cotton, an opening is opened on the top wall of the water tank 2, a thermal insulation cover 21 is covered on the opening, a feeding hole is arranged on the thermal insulation cover 21, a cover plate 22 is hinged on the feeding hole, the water inlet ends of the booster pump 3 and the water pump 4 are connected to the water tank 2, a horizontal pipe 5 is horizontally arranged on the bracket 1, a liquid inlet valve 51 and a liquid outlet valve 52 are respectively arranged at both ends of the horizontal pipe 5, and a first clamp is arranged at the connection between the horizontal pipe 5 and the liquid inlet valve 51 and the liquid outlet valve 52 to improve the connection between the liquid inlet valve 51, the liquid outlet valve 52 and the horizontal pipe 5 The connection strength between them is improved. The liquid inlet valve 51 is connected to the water outlet end of the booster pump 3, and the liquid outlet valve 52 is connected to the water tank 2 through the water outlet pipe. A plurality of vertical pipes 53 are vertically connected and arranged on the horizontal pipe 5. The vertical pipes 53 are all connected to the bracket 1 to improve the stability of the vertical pipes 53. A temperature sensor 54 is arranged on the water tank 2 and any one of the vertical pipes 53. A pressure gauge 55 is arranged on the booster pump 3 and any one of the vertical pipes 53. A continuous cooling pipe 56 is wound around the horizontal pipe 5 and the vertical pipe 53. One end of the cooling pipe 56 is connected to the water pump 4, and the other end of the cooling pipe 56 extends into the water tank 2. The horizontal pipe 5 and the vertical pipe 53 are coated with a second thermal insulation cotton 7, and the second thermal insulation cotton 7 is also coated on the cooling pipe 56.
[0018] A ball valve 57 is provided at the top of the vertical pipe 53, and a second clamp 58 is provided at the connection between the vertical pipe 53 and the ball valve 57 to improve the connection strength between the ball valve 57 and the vertical pipe 53. A pressure-bearing self-locking valve 6 is provided on the ball valve 57, and the pressure-bearing self-locking valve 6 includes: a valve seat 61 connected to the ball valve 57, the valve seat 61 is sleeved on the ball valve 57 and threadedly connected, and a third clamp 59 is provided at the connection between the valve seat 61 and the ball valve 57, a tapered hole is provided in the valve seat 61, a plastic cone sleeve 62 is slidably provided in the cone hole, a step hole 621 is provided in the plastic cone sleeve 62, and a sealing rubber sleeve 63 is provided in the step hole 621, which can be passed through Changing the sealing rubber sleeve 63 can make the plastic cone sleeve 62 adapt to heating cables of different diameters. An external thread section 622 is extended on the plastic cone sleeve 62, and a positioning groove is coaxially arranged on the top wall of the valve seat 61. A plurality of threaded holes are evenly distributed circumferentially in the positioning groove. A positioning sleeve 64 is clamped in the positioning groove. A plurality of connecting holes are evenly distributed circumferentially on the positioning sleeve 64. The connecting holes and the threaded holes are aligned one by one. Screws are threadedly connected in the relatively aligned connecting holes and threaded holes. An internal thread is arranged in the positioning sleeve 64. The external thread section 622 on the plastic cone sleeve 62 is threadedly connected to the internal thread of the positioning sleeve 64. A hexagonal cap 623 is also arranged on the plastic cone sleeve 62.
[0019] When in use, close the liquid outlet valve 52, open the liquid inlet valve 51, open the ball valve 57, pass the electric heating cable to be tested through the step hole 621 in the plastic cone sleeve 62 to contact the sealing rubber sleeve 63, insert the plastic cone sleeve 62 into the tapered hole of the valve seat 61, and the external thread section 622 on the plastic cone sleeve 62 is threadedly connected with the internal thread of the positioning sleeve 64. Then, use a wrench to clamp the hexagonal cap 623 of the column and tighten the plastic cone sleeve 62 on the positioning sleeve 64. During this process, the plastic cone sleeve 62 It will be squeezed by the tapered hole, which not only improves the sealing between the plastic cone sleeve 62 and the valve seat 61, but also can exert extrusion force on the sealing rubber sleeve 63 so that the sealing rubber sleeve 63 tightly clamps the heating cable, thereby improving the sealing between the sealing rubber sleeve 63 and the heating cable and the plastic cone sleeve 62. Then, the heating cable fixed on the pressurized self-locking valve 6 passes through the ball valve 57 and extends into the vertical pipe 53. The valve seat 61 on the pressurized self-locking valve 6 is threadedly connected to the vertical pipe 53 and clamped with the third clamp 59. After all vertical pipes 53 are fixed with pressurized self-locking valves 6, start the booster pump 3, which transports the water in the water tank 2 to the horizontal pipe 5 and pressurizes it. Through the principle of communicating vessels, the pressure in all vertical pipes 53 is the same. When the pressure of the pressure gauge 55 on the booster pump 3 reaches the test pressure, the pressurization is stopped and the liquid inlet valve 51 is closed. The test pressure is much greater than the pressure generated by the water flow in the municipal pipeline, so that the lumens of the horizontal pipe 5 and the vertical pipe 53 are under the test pressure and maintained for a certain period of time. The plastic cone sleeve 62 in the pressurized self-locking valve 6 has a tendency to move upward under the jacking effect of water, and the more the plastic cone sleeve 62 moves upward, the greater the squeezing force of the conical hole of the valve seat 61 on the plastic cone sleeve 62, and the plastic cone sleeve 62 is pressed. The better the sealing between the cone sleeve 62 and the valve seat 61, the plastic cone sleeve 62 and the sealing rubber sleeve 63, and the sealing rubber sleeve 63 and the heating cable, during the test, the pressure in the vertical pipe 53 and the horizontal pipe 5 is observed through the pressure gauge 55 on the vertical pipe 53 to see if there is any leakage. After the heating cable is pressurized in the vertical pipe 53 for a period of time, the liquid outlet valve 52 is opened to discharge the water in the vertical pipe 53 and the horizontal pipe 5 into the water tank 2, the pressurized self-locking valve 6 is removed, the heating cable is removed, and it is checked whether there is water infiltrating into the heating cable. Under high pressure, moisture is more likely to infiltrate into the heating cable. Therefore, when the test pressure is greater than the pressure in the municipal pipeline, the water tightness problem of the heating cable can be discovered more quickly, which can greatly shorten the test cycle.
[0020] When it is necessary to test the low-temperature resistance of the heating cable, fix the heating cable in the pressure-bearing self-locking valve 6, then put the heating cable into the vertical pipe 53, and fix the pressure-bearing self-locking valve 6 on the vertical pipe 53. After opening the cover plate 22, add ice cubes into the water tank 2 through the feeding hole to reduce the water temperature in the water tank 2. When the temperature sensor 54 on the water tank 2 measures that the water temperature in the water tank 2 is reduced to the test temperature, the test temperature is similar to the water temperature in the municipal pipeline under the winter environment. First, open the liquid inlet valve 51 and the liquid outlet valve 52, first use the booster pump 3 to flush the horizontal pipe 5 and the vertical pipe 53 with the cold water in the water tank 2 to reduce the temperature of the horizontal pipe 5 and the vertical pipe 53. At the same time, start the water pump 4, and the water pump transports the cold water in the water tank 2 to the cooling pipe 56 for circulation to increase the cooling speed of the horizontal pipe 5 and the vertical pipe 53. When the water temperature measured by the temperature sensor 54 on the vertical pipe 53 is the same as the temperature of the water in the water tank 2, the test temperature is close to the water temperature in the municipal pipeline under the winter environment. After the water temperature displayed by the sensor 54 is the same, the liquid outlet valve 52 is closed, and the booster pump 3 continues to deliver water to make the pressure in the horizontal pipe 5 and the vertical pipe 53 reach the test pressure, and the liquid inlet valve 51 and the booster pump 3 are closed and maintained for a certain period of time, while the water pump 4 continues to deliver cold water to the cooling pipe 56 to ensure that the water temperature in the horizontal pipe 5 and the vertical pipe 53 is always maintained at the test temperature. When the ice cubes in the water tank 2 melt and the water temperature rises, it is necessary to open the cover plate 22 to add ice cubes again. The first thermal insulation cotton on the water tank 2 and the second thermal insulation cotton on the horizontal pipe 5 and the vertical pipe 53 all play a heat insulation role to prevent the external temperature from affecting the water temperature in the water tank, the horizontal pipe 5 and the vertical pipe 3. After the heating cable is under pressure for a certain period of time, the liquid outlet valve 52 is opened to discharge the cold water in the horizontal pipe 5 and the vertical pipe 53, and the heating cable is taken out. Then, the heating cable is subjected to tensile and impact tests to evaluate the performance of the heating cable in low-temperature water.
[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.
Claims
1. Heating cable watertightness tester, including: The bracket is characterized in that: a water tank, a booster pump and a water pump are arranged on the bracket, the water inlet ends of the booster pump and the water pump are connected to the water tank, a horizontal pipe is horizontally arranged on the bracket, a liquid inlet valve and a liquid outlet valve are arranged at both ends of the horizontal pipe, the liquid inlet valve is connected to the water outlet end of the booster pump, the liquid outlet valve is connected to the water tank through the outlet pipe, a plurality of vertical pipes are arranged vertically on the horizontal pipe, a ball valve is arranged on the top of the vertical pipe, a pressure self-locking valve is arranged on the ball valve, and the pressure self-locking valve includes: a valve connected to the ball valve A seat is provided with a tapered hole in the valve seat, a plastic tapered sleeve is slidably provided in the tapered hole, a step hole is provided in the plastic tapered sleeve, a sealing rubber sleeve is provided in the step hole, an external thread section is extended on the plastic tapered sleeve, a positioning sleeve is provided on the valve seat, an internal thread is provided in the positioning sleeve, the external thread section on the plastic tapered sleeve is threadedly connected with the internal thread of the positioning sleeve, a continuous cooling pipe is wound around the horizontal pipe and the vertical pipe, one end of the cooling pipe is connected to the water pump, and the other end of the cooling pipe extends into the water tank.
2. The heating cable watertightness tester according to claim 1, characterized in that: A pressure gauge is provided on the booster pump and any vertical pipe.
3. The heating cable watertightness tester according to claim 1, characterized in that: Temperature sensors are provided on the water tank and any vertical pipe.
4. The heating cable watertightness tester according to claim 1, characterized in that: The vertical pipe is connected to the bracket.
5. The heating cable watertightness tester according to claim 1, characterized in that: A first clamp is provided at the connection between the horizontal pipe and the liquid inlet valve and the liquid outlet valve, a second clamp is provided at the connection between the vertical pipe and the ball valve, and a third clamp is provided at the connection between the valve seat and the ball valve.
6. The heating cable watertightness tester according to claim 1, characterized in that: A positioning groove is coaxially arranged on the top wall of the valve seat, a plurality of threaded holes are evenly distributed on the circumference of the positioning groove, a plurality of connecting holes are evenly distributed on the circumference of the positioning sleeve, the positioning sleeve is clamped in the positioning groove, the connecting holes are aligned with the threaded holes one by one, and screws are threadedly connected in the relatively aligned connecting holes and threaded holes.
7. The heating cable watertightness tester according to claim 1, characterized in that: The outer wall of the water tank is covered with a first heat-insulating cotton, an opening is opened on the top wall of the water tank, a heat-insulating cover is closed on the opening, a feeding hole is arranged on the heat-insulating cover, and a cover plate is hinged on the feeding hole.
8. The heating cable watertightness tester according to claim 1, characterized in that: The horizontal pipe and the vertical pipe are both covered with second thermal insulation cotton, and the second thermal insulation cotton is also covered on the cooling pipe.