Automatic test device for durability of thermosensitive overflow valve

Abstract

The utility model discloses an automatic test device for durability of a thermosensitive overflow valve. The automatic test device comprises an operation panel, a moving device, a water level monitoring device, a heating constant temperature device and a timing device. Operators do not need to stare at a test site all the time, the space occupancy rate is small, and safety accidents are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of thermal-sensitive overflow valves, and in particular relates to an automatic durability test device for thermal-sensitive overflow valves. Background Art

[0002] The thermal relief valve is a direct-acting two-way type, consisting of a valve body, a valve seat, a valve core, a spring, a support sleeve, a spring seat, a fixed sleeve, a temperature sensing element, an O-ring, etc. The pressure oil port P and the return oil port T are located on the same end face. The oil port is threaded and needs to be connected to the oil pipe with a pipe joint. At room temperature, the valve core is in an open state. The core of the temperature sensing element is a mixture of paraffin and metal powder. The temperature sensing ability of paraffin itself is not good. In applications, it is improved by adding metal powder to make a composite material, and its expansion ability mainly depends on the characteristics of the paraffin itself. As the temperature of the temperature sensing element gradually increases, the relationship curve between the volume and temperature of paraffin is nonlinear as a whole. However, it can be divided into three zones, low temperature zone AB (paraffin is all solid), phase change zone BC (paraffin is in a solid-liquid mixed state) and high temperature CD (paraffin is all liquid), and all three zones show an approximate linear relationship. It is best to work in the phase change zone, where the body expansion coefficient is the largest. When the temperature control valve is in a static state, the reset spring and the pressure regulating spring are in a balanced state, the valve core is in linear contact with the valve seat, and the oil port P is disconnected from the oil port T. As the temperature rises (<75℃, in the low temperature zone, paraffin is solid), the volume of paraffin expands less, and the spring preload is correspondingly smaller. At this time, the oil port P is passed through a pressure oil of <2MPa, and the valve core can be opened. When the temperature is >75℃, <85℃, the paraffin is in the phase change zone, gradually changing from solid to liquid. At this time, the paraffin body expansion coefficient is the largest, and the spring preload increases linearly. A larger pressure oil needs to be passed through to open the valve core.

[0003] When conducting a durability test on a thermal relief valve, it is necessary to introduce 28MPa pressure oil, place the thermal relief valve temperature sensing element in boiling water, and when the pressure rises to 28MPa, the upper limit of the pressure regulating range, place it in normal temperature water and wait until the pressure drops to 0. This process is one cycle and needs to be repeated 100,000 times manually.

[0004] During this process, the durability test requires two operators, one to operate the power switch (in order to save energy, the power needs to be turned on and off repeatedly, and the hot water needs to be heated repeatedly. On the other hand, for safety reasons, continuous heating should be avoided to reduce the life of the heating device wires), and one to repeatedly place the valve in hot water and room temperature water, which is time-consuming and labor-intensive. The power source needs to remain on for a long time, making the working environment noise higher than 85 decibels, which is harmful to the occupational health of the operators; the hydraulic valve is always in a process of building pressure (28MPa) and unloading pressure, and there is a possibility that the joint interface will be impacted and collapsed, causing a safety accident; on the other hand, if it is in boiling water, there is also a possibility of burns. Utility Model Content

[0005] The utility model aims to provide an automatic durability test device for a thermal-sensitive overflow valve, which does not require an operator to keep a close eye on the test site all the time, has a low space occupancy rate, and reduces the occurrence of safety accidents.

[0006] The technical solution is as follows:

[0007] The thermal relief valve durability automatic test device includes: an operation panel, a moving device, a water level monitoring device, a heating constant temperature device, and a timing device; the operation panel is provided with a display screen and operation buttons, through which the temperature control valve action, temperature setting, and static time can be set respectively; the moving device includes: a temperature control valve fixing frame, a fixing plate, a cylinder, a pneumatic triplet, a pneumatic reversing valve, a vertical automatic lifting slider, and a horizontal linear moving slider; the temperature control valve fixing frame is fixed to the fixing plate by screws through the lifting slider, and the other side of the fixing plate is connected to the horizontal linear moving slider by screws, and the cylinder is provided with a plurality of pneumatic reversing valves, and the pneumatic reversing valves are ... A pressure difference is formed between the rod cavity and the rodless cavity, so that the temperature control valve and the fixed frame reciprocate along the linear sliding guide rail; through the pneumatic reversing valve and the pneumatic triplet, it acts on the lifting cylinder, and a pressure difference is formed between the rod cavity and the rodless cavity inside the cylinder, so that the temperature control valve and the fixed frame move up and down along the vertical guide rail; the water level monitoring device includes: a water level sensor, a water pump, and a water pipe. The water level sensor is fixed on the temperature control valve fixed frame; the heating constant temperature device includes: a heater, an aluminum water bucket, and a temperature sensor. The aluminum water bucket is fixed on the bottom plate of the test device, and the medium temperature in the aluminum water bucket is reflected on the control panel through the temperature sensor.

[0008] Further, the timing device is connected to the control panel through a wire.

[0009] Compared with the prior art, the utility model has the following advantages:

[0010] The utility model can automatically control the temperature control valve to repeatedly stand in hot water and cold water after the temperature control valve is fed with 28MPa pressure oil; the standing time in hot water and cold water can be set; the water temperature can be set; the straight line and lifting time can be set; and the water level can be automatically monitored. This frees up manpower, and the operator does not need to keep an eye on the test site all the time, and can avoid staying in a high-noise environment for a long time; and it is highly integrated, with less space occupancy, and can be placed in a relatively closed space to reduce the occurrence of safety accidents.

[0011] The operation panel includes a display screen and operation buttons, through which the test device can be operated and shut down, the time for the temperature control valve to automatically rise and fall vertically and travel in a straight line to reach the limit position can be set, the medium temperature in the aluminum water bucket can be set, and the time for the aluminum water bucket to stand still can be set.

[0012] The temperature control valve is an automatic vertical lifting and horizontal linear moving device. The temperature control valve fixing frame is fixed to the fixing plate through the lifting slider with screws, and the other side of the fixing plate is connected to the linear moving slider with screws. The external air source supplies air, which acts on the cylinder through the pneumatic reversing valve and the pneumatic triplet. The rod cavity and the rodless cavity inside the cylinder form a pressure difference, so that the temperature control valve and the fixing frame reciprocate along the linear moving slider; the pneumatic reversing valve and the pneumatic triplet act on the lifting cylinder, and the rod cavity and the rodless cavity inside the cylinder form a pressure difference, so that the temperature control valve and the fixing frame move up and down along the lifting slider.

[0013] The water level sensor of the automatic water level monitoring device is fixed on the temperature control valve fixing frame. When the temperature control valve fixing frame descends and reaches the limit point, the water level sensor automatically monitors the water level. When the water level drops, the water pump works automatically through program control, thereby realizing the automatic water adding function.

[0014] The 1300W heater in the automatic heating constant temperature device is fixed to the aluminum bucket by bolts. The temperature sensor is located at the bottom of the aluminum bucket, and the aluminum bucket is fixed to the bottom plate of the test device. The medium temperature in the aluminum bucket can be reflected on the control panel through the temperature sensor. When it is higher than the temperature setting value, the heater is turned on through program control, and when it is heated to the set temperature, the heater stops working.

[0015] The automatic cooling thermostatic device includes a cooler, an aluminum bucket, a water pipe, and a temperature sensor. The aluminum bucket is fixed on the bottom plate of the test device. The temperature of the medium in the aluminum bucket can be reflected on the control panel through the temperature sensor. When the temperature is higher than the set value, the cooler is turned on through program control, and the medium in the aluminum bucket is extracted through a water pump, cooled by the cooler, and flows back to the aluminum bucket. When the temperature drops to the set value, the cooler stops working.

[0016] The timing device can control the time for automatic vertical lifting and straight line travel to reach the limit position, and can also set the time for the temperature control valve to remain in the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of the structure of the automatic test device for the durability of the thermal-sensitive overflow valve. DETAILED DESCRIPTION

[0018] The following description sufficiently illustrates specific embodiments of the present invention to enable those skilled in the art to practice and reproduce the same.

[0019] like Figure 1 The figure is a schematic diagram of the structure of the automatic test device for durability of the thermal-sensitive overflow valve in the utility model.

[0020] The thermal relief valve durability automated testing device comprises: an operation panel 2, a moving device 7, a water level monitoring device, a heating constant temperature device, a cooling constant temperature device, and a timing device;

[0021] The moving device 7 includes: a temperature control valve fixing frame, a fixing plate 4, a cylinder 5, an air pipe, a pneumatic triplet 6, a pneumatic reversing valve, a lifting slider, and a linear moving slider 3; the temperature control valve fixing frame is fixed to the fixing plate by screws through the lifting slider, and the other side of the fixing plate is connected to the linear moving slider by screws; the external air source acts on the cylinder 5 through the pneumatic reversing valve and the pneumatic triplet 6, and a pressure difference is formed between the rod cavity and the rodless cavity inside the cylinder 5, so that the temperature control valve and the fixing frame reciprocate along the linear sliding guide rail; the pneumatic reversing valve and the pneumatic triplet 6 act on the cylinder 5, and a pressure difference is formed between the rod cavity and the rodless cavity inside the cylinder 5, so that the temperature control valve and the fixing frame move up and down along the lifting guide rail.

[0022] The operation panel 2 includes a display screen and operation buttons. The display screen has 5 modules. The operation buttons can be used to set the temperature control valve action, temperature setting, and static time respectively.

[0023] The water level monitoring device includes: a water level sensor, a water pump, and a water pipe; the water level sensor is fixed on the temperature control valve fixing frame. When the temperature control valve fixing frame descends and reaches the limit point, the water level sensor automatically monitors the water level. When the water level drops, the water pump is controlled by the program and works automatically, thereby realizing the automatic water adding function.

[0024] Automatic heating constant temperature device: including 1300W heater, aluminum bucket 1, temperature sensor. The aluminum bucket is fixed on the bottom plate of the test device. The medium temperature in the aluminum bucket can be reflected on the control panel through the temperature sensor. When it is higher than the temperature setting value, the heater is turned on through program control, and when it is heated to the set temperature, the heater stops working.

[0025] The cooling thermostatic device includes: a cooler, an aluminum bucket, a water pipe, a water pump, and a temperature sensor. The timing device requires an operation panel to program. The water level sensor is fixed on the temperature control valve fixing frame. When the temperature control valve fixing frame drops and reaches the limit point, the water level sensor automatically monitors the water level. When the water level drops, the water pump automatically works through program control to realize the automatic water adding function. The aluminum bucket is fixed on the bottom plate of the test device. The temperature of the medium in the aluminum bucket can be reflected on the control panel through the temperature sensor. When it is higher than the temperature setting value, the heater is turned on through program control and heated to the set temperature, and the heater stops working. The aluminum bucket is fixed on the bottom plate of the test device. The temperature of the medium in the aluminum bucket can be reflected on the control panel through the temperature sensor. When it is higher than the temperature setting value, the cooler is turned on through program control, and the medium in the aluminum bucket is extracted through the water pump. After being cooled by the cooler, it flows back to the aluminum bucket. When it drops to the set temperature, the cooler stops working.

[0026] The timing device can control the time for automatic vertical lifting and horizontal linear movement to reach the limit position, and can also set the time for the temperature control valve to remain in the medium.

[0027] The terms used in the present invention are illustrative and exemplary, rather than restrictive. Since the present invention can be implemented in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. An automated durability test device for thermal relief valves, characterized in that: include: Operation panel, moving device, water level monitoring device, heating constant temperature device, timing device; the operation panel is provided with a display screen and operation buttons, through which the temperature control valve action, temperature setting, and static time can be set respectively; the moving device includes: temperature control valve fixing frame, fixing plate, cylinder, pneumatic triplet, pneumatic reversing valve, vertical automatic lifting slider, horizontal linear moving slider; the temperature control valve fixing frame is fixed to the fixing plate by screws through the lifting slider, and the other side of the fixing plate is connected to the horizontal linear moving slider by screws, and the cylinder has a rod cavity and a rodless cavity to form The pressure difference causes the temperature control valve and the fixed frame to reciprocate along the linear sliding guide rail; through the pneumatic reversing valve and the pneumatic triplet, it acts on the lifting cylinder, and the rod chamber and the rodless chamber inside the cylinder form a pressure difference, causing the temperature control valve and the fixed frame to move up and down along the vertical guide rail; the water level monitoring device includes: a water level sensor, a water pump, and a water pipe. The water level sensor is fixed on the temperature control valve fixed frame; the heating constant temperature device includes: a heater, an aluminum water bucket, and a temperature sensor. The aluminum water bucket is fixed on the bottom plate of the test device. The medium temperature in the aluminum water bucket is reflected on the control panel through the temperature sensor.

2. The thermal relief valve durability automated testing device according to claim 1, characterized in that: The timing device is connected to the control panel via wires.

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