JPH0557650U - Hose pressure resistance test equipment - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To provide a hose pressure resistance test device capable of easily performing a pressure resistance test of the hose pressure resistance according to the actual usage conditions of the hose. A constant temperature water tank 10 for accommodating a sample hose W, the temperature of which is adjustable, a connection pipe 13 having a pressure sensor 11 for connecting one end of the sample hose W and a pressure release valve 12, and the sample hose Safety valve 14 at the other end of W
It is composed of a (shutoff valve) and a pressure cylinder 16 (an LPG cylinder in this embodiment) which is connected via a connection pipe 15. The water temperature of the constant temperature water tank 10 is set to 4 by the heating means.
It is configured to be adjustable from 0 ° C to 100 ° C. Further, the pressure sensor 11 and the pressure release valve 12 that connect one end of the sample hose W have a pressure drop when the sample hose W is cracked and the pressure fluid in the hose leaks into the constant temperature water tank 10. Is detected and the safety valve 14 is operated.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a pressure test device for a hose, and more particularly, to a test device for performing a pressure test according to actual usage conditions of a hose for LPG (liquefied petroleum gas), for example.

[0002]

[Prior Art]

Conventionally, as a hose for passing the liquid of LPG, generally, as shown in FIG. 3, a hose in which a reinforcing layer 3 is laminated on an inner rubber layer 1 having LPG resistance and further covered with an outer rubber layer 4. Is basically used. Liquid flows through the hose used in engines that use LPG as fuel, but the heat resistance and pressure resistance required for hoses have become stricter year by year as the weight and size of vehicle bodies have been reduced in recent years. The maximum operating temperature of about ℃ is about + 70 ℃, and the hose pressure at that time is as high as 24.6kgf / cm ² .

[0003]

[Problems to be solved by the device]

 However, under the above-described high temperature use condition, it was found that in the case of a normal LPG hose, the inner rubber layer 1 is cracked due to the influence of the liquid pressure and temperature of the LPG during use. By the way, as a general test method for oil-resistant hoses, a method of applying a liquid such as water or oil to the hose under pressure is generally used. The test method of LPG in a liquid state has not been particularly performed.

The present invention has been devised in view of such conventional problems, and is a hose pressure resistance test device capable of easily performing a hose pressure resistance test according to actual usage conditions of the hose. It is intended to provide. Another object of the present invention is to provide a hose pressure resistance test device that can easily perform a pressure resistance test at any pressure according to the usage conditions by changing the pressure inside the hose.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a connection pipe equipped with a constant temperature water bath in which a sample hose is submerged and accommodated and whose water temperature can be adjusted, a pressure sensor connecting one end of the sample hose, and a pressure discharge valve. And a pressure cylinder connected to the other end of the sample hose via a safety valve and a connecting pipe.

Further, the present invention is directed to a constant temperature water bath in which a sample hose is submerged and accommodated, in which the temperature of water can be adjusted, and a connection pipe including a pressure sensor for connecting one end of the sample hose and a pressure release valve. , A pressure cylinder connected to the other end of the sample hose via a safety valve and a connecting pipe, and a connecting pipe connecting the safety valve and the pressure vessel with a pressure regulator via a switching valve. The point is to connect a pressure cylinder.

[0007]

[Function of the device]

 This invention is configured as described above, and submerges a sample hose enclosing a liquid of a predetermined pressure supplied from a pressure cylinder into a constant temperature water tank set to a predetermined water temperature, and successively cools the water temperature in the constant temperature water tank. This is to test the pressure resistance of the hose at high temperature while changing to the high temperature side.

In addition, when a test is performed by applying a water pressure equal to or higher than the pressure of the pressure cylinder to the inside of the hose, by supplying pressure from the additional pressure cylinder in addition to the pressure of the pressure cylinder, the pressure resistance of the hose against the high pressure is further increased. A sex test can be performed.

[0009]

[Example of device]

 An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a pressure resistance test apparatus showing a first embodiment of the present invention. This pressure resistance test apparatus includes a constant temperature water tank 10 for accommodating a sample hose W and having a water temperature adjustable, and the sample hose W. A connecting pipe 13 having a pressure sensor 11 and a pressure releasing valve 12 which are connected to one end of the pressure hose W, and a pressure cylinder 16 (which is connected to the other end of the sample hose W via a safety valve 14 (a shutoff valve) and a connecting pipe 15 ( In this embodiment, the LPG cylinder) is used. The constant temperature water tank 10 is configured such that the water temperature can be adjusted to 40 ° C. to 100 ° C. by a heating means (not shown).

Further, the pressure sensor 11 and the pressure release valve 12 that connect one end of the sample hose W, such as when the sample hose W is cracked and the pressure fluid in the hose leaks into the constant temperature water tank 10, etc. First, the pressure drop is detected, the safety valve 14 is operated, and the supply of the pressurized liquid supplied from the pressure cylinder 16 is shut off. In the pressure test method of the sample hose W configured as above, one end of the sample hose W to be subjected to the pressure test outside the constant temperature water tank 10 is provided with a connection pipe 13 including a pressure sensor 11 and a pressure release valve 12. , And the other end of the sample hose W is connected to a connecting pipe 15 equipped with a safety valve 14 (shutoff valve), and a predetermined pressure is supplied from a pressure cylinder 16 (7.4 kgf / cm at 20 ° C. for propane gas). The liquid LPG of ² ) is always supplied through the safety valve 14, and in this state, the liquid LPG is submerged in the liquid of the constant temperature water tank 10 to be contained.

From this state, the temperature of the liquid in the constant temperature water tank 10 is gradually increased from room temperature to 100 ° C., and the pressure of the sample hose W due to the change in the temperature (for example, in the case of propane gas, 60 ° C.). The pressure sensor 11 measures 21.6 kgf / cm ² , 96.8 and 42.0 kgf / cm ² . When the pressure sensor 11 detects that the pressure in the sample hose W has dropped due to cracks or the like in the sample hose W, the pressure release valve 12 is opened to release the pressure to the outside and the safety valve 14 To shut off the supply of the pressurized liquid supplied from the pressure cylinder 16.

By doing so, the internal pressure until the sample hose W is broken due to the temperature rise can be measured, and the pressure resistance test can be performed. FIG. 2 shows a second embodiment of the present invention. This embodiment is carried out when a test is performed by applying a pressure higher than the pressure by the pressure cylinder 16a into the sample hose W. A constant temperature water bath 10 for accommodating the water temperature for containing the hose W, a connection pipe 13 having a pressure sensor 11 for connecting one end of the sample hose W and a pressure release valve 12, and the sample hose W A pressure cylinder 16a connected to the end via a safety valve 14 and a connection pipe 15, and a branch pipe 18 via a switching valve 17 in the middle of the connection pipe 15 connecting the safety valve 14 and the pressure cylinder 16a. Is connected to one end of the branch pipe 18 and the other end of the branch pipe 18 is connected to an additional pressurizing cylinder 20 such as a nitrogen gas equipped with a pressure regulator 19. A pressure gauge 21 for measuring the pressure inside the sample hose W is provided in the middle of the branch pipe 18.

In this embodiment, it is possible to perform a pressure resistance test until the sample hose W is destroyed in the high temperature constant temperature water tank 10, and the sample hose W is subjected to a pressure load equal to or higher than the pressure by the pressure cylinder 16a in the first embodiment. By pressurizing inside, the pressure resistance test at higher pressure can be easily performed.

[0014]

[Effect of the device]

 This invention makes it possible to easily perform a pressure test of a sample hose as described above in a state that complies with the actual usage conditions of the hose. In addition to the effect that can be achieved, even when performing a high pressure test at a higher temperature, by changing the pressure in the hose, a pressure resistance test can be easily performed at any pressure according to the operating conditions. There is.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a withstand voltage test apparatus showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a withstand voltage test apparatus showing a second embodiment of the present invention.

FIG. 3 is a sectional view of a conventionally used oil resistant hose.

[Explanation of symbols]

 10 Constant Temperature Water Tank 11 Pressure Sensor 12 Pressure Release Valve 13 Connection Pipe 14 Safety Valve 15 Connection Pipe 16 Pressure Cylinder W Sample Hose 17 Switching Valve 18 Branch Pipe 19 Pressure Regulator 20 Additional Pressurized Cylinder

Claims (2)

[Scope of utility model registration request] 1. A constant temperature water bath capable of adjusting the temperature of water for submerging and containing a sample hose, a connection pipe having a pressure sensor and a pressure release valve for connecting one end of the sample hose, and a sample hose of the sample hose. A pressure resistance testing device for a hose, which comprises a pressure cylinder connected to the other end through a safety valve and a connection pipe. 2. A constant temperature water bath capable of adjusting the temperature of the water for submerging and containing a sample hose, a connection pipe provided with a pressure sensor and a pressure release valve for connecting one end of the sample hose, and a sample hose of the sample hose. It consists of a pressure cylinder connected to the other end via a safety valve and a connection pipe,
A pressure test device for a hose, wherein an additional pressurizing cylinder equipped with a pressure regulator is connected to a connecting pipe connecting the safety valve and the pressure cylinder via a switching valve.