CN217059301U - Positive and negative pressure test device - Google Patents
Positive and negative pressure test device Download PDFInfo
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- CN217059301U CN217059301U CN202123393115.6U CN202123393115U CN217059301U CN 217059301 U CN217059301 U CN 217059301U CN 202123393115 U CN202123393115 U CN 202123393115U CN 217059301 U CN217059301 U CN 217059301U
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Abstract
The invention provides a positive and negative pressure test device, which comprises a device body, a positive pressure test assembly and a negative pressure test assembly, wherein the positive pressure test assembly and the negative pressure test assembly are arranged on the device body; in a positive pressure test state, a channel between the negative pressure test assembly and the cavity is sealed; and in the negative pressure test state, a channel between the positive pressure test assembly and the cavity is sealed.
Description
Technical Field
The utility model relates to a positive negative pressure test technical field especially relates to a positive negative pressure test device.
Background
With the rapid development of deep space exploration technology in China, the functional requirements of people on the ground environment simulation device are higher and higher. The environmental simulation test generally comprises a positive pressure test and a negative pressure test, wherein the positive pressure test is generally realized by a pressure container, and the negative pressure test is realized by a vacuum container. At present, positive pressure test and negative pressure test are respectively carried out in two devices and in sealed containers with different working conditions.
SUMMERY OF THE UTILITY MODEL
The present disclosure provides a positive and negative pressure test apparatus to at least solve the above technical problems existing in the prior art.
The invention provides a positive and negative pressure test device, which comprises a device body, a positive pressure test component and a negative pressure test component, wherein the positive pressure test component and the negative pressure test component are arranged on the device body;
in the positive pressure test state, a channel between the negative pressure test assembly and the cavity is sealed; and in the negative pressure test state, the positive pressure test assembly is sealed with a channel between the cavities.
In an implementation manner, a plurality of interfaces serving as the channels are formed in the device body, the interfaces are communicated to the cavity, and the positive pressure test assembly and the negative pressure test assembly are connected with the device body in a flange connection manner.
In one implementation mode, the interfaces comprise a rough pumping interface, a liquid nitrogen inlet and outlet interface, a cryogenic pump interface, a negative pressure pumping interface and a negative pressure inflation interface; the negative pressure test assembly comprises a rough pump communicated with a rough pump interface, a liquid nitrogen device communicated with a liquid nitrogen inlet and outlet interface, a cryogenic pump communicated with the cryogenic pump interface, an air pump communicated with the negative pressure air pumping interface and a first air pump communicated with the negative pressure air inflation interface.
In an implementation manner, the negative pressure test assembly further includes a vacuum gauge for measuring the pressure inside the cavity, the interface further includes a negative pressure measurement interface, the vacuum gauge is connected with the negative pressure measurement interface through a positive pressure ball valve and a vacuum valve, the apparatus body is further provided with a display instrument for receiving a signal of the vacuum gauge, and an upper limit value and a lower limit value of the display instrument are respectively interlocked with the air pump and the first air pump;
when the vacuum gauge signal is higher than the upper limit value, the air pump is started, and the first air pump is stopped; and when the vacuum gauge signal is lower than the lower limit value, the first air pump is started, and the air pump is stopped.
In one embodiment, the interface further comprises a positive pressure inflation/deflation interface, and the positive pressure test assembly comprises a second inflator pump communicated with the positive pressure inflation/deflation interface.
In one embodiment, the positive pressure test assembly includes a positive pressure gauge for measuring the air pressure in the cavity, and the interface further includes a positive pressure measurement interface, the positive pressure gauge being mounted on the positive pressure measurement interface.
In an implementation manner, each of the interfaces includes a connection pipe, a flange and a flange outer pipeline which are sequentially connected, a first end of the connection pipe is connected to the device body, a second end of the connection pipe is sleeved with the flange, one end of the flange outer pipeline is fixedly connected with the flange, and the other end of the flange outer pipeline is a free end; and a positive pressure ball valve and a vacuum valve are assembled in the outer pipeline of the flange.
In an implementation manner, the flange includes a first flange located on the device body and a second flange matched with the first flange, the first flange is provided with a trapezoidal sealing groove, and an O-shaped fluororubber sealing ring is installed in the sealing groove.
In one embodiment, the cryopump is provided with a vacuum gate valve and the roughing pump is provided with a vacuum flapper valve.
In an embodiment, the device body includes a first body and a second body, the first body and the second body form the complete cavity when connected, and the first body and the second body are connected by a sealing device in a sealing manner.
Based on the above scheme, this disclosure has following beneficial effect:
(1) the negative pressure test assembly and the positive pressure test assembly are integrated on one device, and the positive pressure test and the negative pressure test are respectively carried out under the condition of a sealed cavity, so that compared with the existing device which only can provide a positive pressure test working condition or a negative pressure test working condition, the positive pressure test device and the negative pressure test device can carry out the positive pressure test and the negative pressure test on the same device body only by switching the positive pressure test assembly or the negative pressure test assembly without using two sets of test working conditions;
(2) the positive pressure test assembly and the negative pressure test assembly are respectively connected with the interfaces on the device body in a flange mode, so that the device is convenient to disassemble, and the sealing treatment means of each interface under positive pressure and negative pressure tests are added;
(3) when a negative pressure test is carried out, the cavity is pumped to a required vacuum state through the rough pump, the pressure in the closed cavity is further controlled by starting the low-temperature pump and filling liquid nitrogen into the tank through heat sink, and the air pressure in the cavity can be kept to a target vacuum state by matching with the air pump and the first air pump;
(4) the vacuum gauge can be used for timely detecting and receiving the current air pressure feedback of the cavity, and the starting and stopping of the air extracting pump and the first inflating pump can be conveniently adjusted in an interlocking manner, so that the air pressure state in the cavity can be further accurately controlled;
(5) the second air pump is arranged, when the cavity is switched to the positive pressure test state, air is filled into the cavity, and the positive pressure measuring instrument can be used for measuring the air pressure in the cavity in real time, so that the cavity can keep the optimal positive pressure test state;
(6) the first flange is provided with the sealing groove and the O-shaped fluororubber sealing ring on the interface connected with the negative pressure test assembly and the positive pressure test assembly, so that the sealing performance of each interface in the use process can be effectively enhanced, the sealing performance of the whole cavity is enhanced, and the accuracy of a positive pressure test and a negative pressure test is improved;
(7) by arranging the positive pressure ball valve and the vacuum valve, the interface can be effectively closed when a positive pressure test or a negative pressure test is carried out, the influence on the cavity is blocked, and a better test state is achieved;
(8) the gate valve is of a bidirectional sealing structure, no sealing material is required to be coated, and the valve plate of the gate valve can keep a vacuum sealing effect when any side of the valve plate is under atmospheric pressure and the other side of the valve plate is under vacuum; the sealing performance of the whole device in positive and negative pressure tests is further improved by using the sealing device.
Drawings
FIG. 1 is a schematic diagram of a front view of an apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic side view of a device according to an embodiment of the present disclosure;
fig. 3 is a schematic top view of a device according to an embodiment of the present disclosure.
In the figure: 1. a device body; 101. a first body; 102. a second body; 2. a coarse pumping machine interface; 3. a liquid nitrogen inlet and outlet interface; 4. a cryopump interface; 5. a negative pressure air extraction interface; 6. a negative pressure inflation interface; 7. a negative pressure measurement interface; 8. a positive pressure air charging and discharging interface; 9. a positive pressure measurement interface; 10. a sealing device; 11. a standby port; 12. an emergency air release port.
Detailed Description
In order to make the objects, features and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In order to complete positive and negative pressure tests in the same device, as shown in fig. 1, an embodiment of the disclosure provides a positive and negative pressure test device, which comprises a device body 1, a positive pressure test assembly and a negative pressure test assembly, wherein the positive pressure test assembly and the negative pressure test assembly are arranged on the device body 1;
in a positive pressure test state, a channel between the negative pressure test assembly and the cavity is sealed; and in the negative pressure test state, a channel between the positive pressure test assembly and the cavity is sealed.
Wherein, set up a plurality of interfaces as the passageway on the device body 1, the interface communicates to the cavity, and positive pressure test subassembly and negative pressure test subassembly all link to each other with device body 1 through the form with interface flange joint.
It should be understood that the switching between positive and negative pressure in this embodiment is indicative of a need to perform either a positive pressure test or a negative pressure test. Even though the device body 1 is provided with the plurality of interfaces communicated to the cavity, when the cavity is used for positive pressure test or negative pressure test, part of the interfaces are in a closed state, and part of the interfaces are in a state of working with the test component in a corresponding test state, so that the cavity is in a closed state to provide a test environment.
The negative pressure test assembly is used for providing equipment or conditions for vacuumizing the cavity so as to enable the interior of the cavity to form a negative pressure test state, therefore, the negative pressure test assembly is communicated with the cavity through the interface serving as the channel when the negative pressure test is carried out, the negative pressure test assembly is not communicated with the cavity when the positive pressure test is carried out, and the channel, namely the interface, is in a closed state. The positive pressure test assembly is used for providing equipment or conditions for applying positive pressure to the cavity so as to form a positive pressure test state in the cavity; therefore, it can be understood that the positive pressure test assembly is communicated with the cavity through the interface serving as the channel when the positive pressure test is carried out, and the positive pressure test assembly is not communicated with the cavity when the negative pressure test is carried out, so that the channel, namely the interface, is in a closed state.
Preferably, the interface for connecting the negative pressure test assembly comprises a rough pumping machine interface 2, a liquid nitrogen inlet and outlet interface 3, a low-temperature pump interface 4, a negative pressure pumping interface 5, a negative pressure inflation interface 6 and a negative pressure measurement interface 7; the negative pressure test assembly comprises a rough pump communicated with a rough pump interface 2, a liquid nitrogen device communicated with a liquid nitrogen inlet and outlet interface 3, a cryogenic pump communicated with a cryogenic pump interface 4, an air pump communicated with a negative pressure air pumping interface 5, an air source communicated with a negative pressure inflation interface 6 and a vacuum gauge communicated with a negative pressure measurement interface 7, wherein the air source can be from a first inflation pump.
The vacuum gauge is used for detecting the vacuum degree in the cavity under the negative pressure test state, still installs the display instrument who is used for receiving the vacuum gauge signal on the device body 1, and wherein, the display instrument is the display instrument of vacuum gauge, and the vacuum gauge is used for showing and control vacuum gauge, and the signal of telecommunication of receiving the vacuum gauge converts numerical value into, and the rethread display instrument shows. The upper limit value and the lower limit value of the display instrument are respectively interlocked with the signals of the rough pumping machine or the air pump and the first inflator pump. The vacuum gauge measures the vacuum degree in the cavity according to the vacuum gauge, and when a vacuum gauge signal is higher than an upper limit, the rough pumping machine or the air pumping pump is started to continue pumping air in the cavity; when the negative pressure inflation interface 6 is communicated with a direct air source, the air source can be controlled to be input into the cavity through the switch of the pneumatic valve; when the vacuum gauge signal is lower than the lower limit, starting a first inflator pump to inflate the cavity; the upper and lower limit values of the display instrument of the vacuum gauge are used in cooperation with the air pump and the first inflator pump in an interlocking mode, so that the required vacuum degree of the interior of the closed cavity in the negative pressure test state can be maintained.
As shown in fig. 1 to 3, the interface further includes a positive pressure inflation/deflation interface 8 and a positive pressure measurement interface 9 connected to the positive pressure test component, the positive pressure test component includes a second inflator pump communicated with the positive pressure inflation/deflation interface 8, and further includes a positive pressure measurement instrument for measuring the air pressure in the cavity, and the positive pressure measurement instrument is installed on the positive pressure measurement interface 9.
Preferably, the interface comprises a connecting pipe, the flange and an outer flange pipeline which are sequentially connected, a first end of the connecting pipe is connected to the device body 1, a second end of the connecting pipe is sleeved with the flange, one end of the outer flange pipeline is fixedly connected with the flange, and the other end of the outer flange pipeline is a free end; the flange outer pipeline is internally provided with a positive pressure ball valve and a vacuum valve, the installation sequence and the connection mode of the positive pressure ball valve and the vacuum valve are determined according to the device body 1 and test requirements, and no specific limitation is made here.
The flange includes the first flange that is close to the takeover and the supporting second flange with first flange, and the second flange can be fixed on the interface with first flange mating connection, also can set up on negative pressure test subassembly and malleation test subassembly so that carry out the flange when with interface connection and mate. A trapezoid sealing groove is formed in the first flange, a sealing ring is installed in the sealing groove, and preferably, the sealing ring is an O-shaped fluororubber sealing ring.
Preferably, the cryogenic pump is provided with a gate valve, and the gate valve is of a bidirectional sealing structure, so that an interface connected with the cryogenic pump can be effectively sealed, and the sealing state in the cavity is kept.
As shown in fig. 1 and 3, the device body 1 includes a first body 101 and a second body 102, the first body 101 and the second body 102 form a complete cavity when connected, and the first body 101 and the second body 102 are hermetically connected by a sealing device 10. In this scheme, sealing device 10 can also be called the quick-open gate, and the quick-open type adopts general quick-open mechanical form, and this sealing device 10 is used for when beginning or faster test article, through opening sealing device 10 to dismantle device body 1 for first body 101 and second body 102, expose the cavity, put into the test article.
Preferably, still be equipped with reserve mouth 11 and emergent relief of air port 12 on the device body 1, reserve mouth 11 is used for when carrying out positive pressure test or negative pressure test, according to the relevant subassembly of in time demand switch-on. The emergency relief port 12 is used for relieving air when the air pressure in the cavity is abnormal.
It should be understood that there is a heat sink in the cavity, and in this embodiment, the heat sink is a stainless steel plate or black paint is painted on the inner surface of the cavity, which is only an example and not a specific limitation to the heat sink.
Because the sealing device 10 on the device body 1 and the sealing performance of each interface during the positive and negative pressure test are better, the purpose of performing the positive and negative pressure test in the same device body 1 can be realized.
The specific implementation mode is as follows:
before the test, the sealing device 10 is opened to expose the cavity, the test object is put in, and the sealing device 10 is closed, so that the first body 101 and the second body 102 are hermetically connected to form the device body 1.
When the negative pressure test is carried out, all the interfaces connected with the positive pressure test assembly are closed in a mode of closing the vacuum valve and the positive pressure ball valve of the corresponding interfaces; opening all the interfaces connected with the negative pressure test assembly in a manner of opening the vacuum valve and the positive pressure ball valve of the corresponding interfaces;
pumping air pressure in the cavity to be lower than 10Pa by a rough pumping machine, opening a liquid nitrogen inlet and outlet port 3, introducing liquid nitrogen at-196 ℃ into the cavity through heat sink of a liquid nitrogen device, starting a low-temperature pump which is precooled in advance, and further reducing the air pressure in the cavity, wherein the air pressure target in the cavity is lower than 1 x 10 in a negative pressure test state -5 Pa, the air pressure in the cavity is reduced to less than 1 x 10 -5 Pa; the whole process is detected in time by a vacuum gauge and interlocked with a rough pump or an air pump and a first inflator pump, and because the device body 1 has the inevitable possibility of leakage, in order to ensure the vacuum degree in the cavity, when the pressure in the cavity is higher than 1 x 10 - 5 When Pa, namely the value fed back by the vacuum gauge is higher than the upper limit, starting the rough pumping machine or the air pumping pump to perform the pumping step, and when the air pressure in the cavity is lower than 1 x 10 -5 Pa, i.e. when the value fed back by the vacuum gauge is lower than the upper limit, the first inflator pump is started to perform the inflation step, so that the air pressure in the cavity is kept at 1 × 10 -5 Pa or so. It should be noted that the air pressure value in the present embodiment is only an example, and a specific vacuum degree target needs to be established according to actual requirements, for example, as long as a high vacuum state is ensured in the cavity.
When the positive pressure test is carried out, all the interfaces connected with the negative pressure test assembly are closed in a mode of closing the vacuum valve and the positive pressure ball valve of the corresponding interfaces; opening all the interfaces connected with the positive pressure test assembly in a manner of opening the vacuum valve and the positive pressure ball valve of the corresponding interfaces;
the second inflator pump is used for inflating towards the positive pressure inflation and deflation interface 8, and the air pressure condition in the cavity is monitored through the positive pressure measuring instrument so as to control the inflation degree of the second inflator pump.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A positive and negative pressure test device is characterized by comprising a device body (1), a positive pressure test component and a negative pressure test component, wherein the positive pressure test component and the negative pressure test component are arranged on the device body (1), a cavity is arranged in the device body (1), the cavity forms at least two states through the switching of positive pressure and negative pressure, and the states comprise a positive pressure test state for applying positive pressure to the cavity through the positive pressure test component and a negative pressure test state for vacuumizing the cavity through the negative pressure test component;
in the positive pressure test state, a channel between the negative pressure test assembly and the cavity is sealed; and in the negative pressure test state, the positive pressure test assembly is sealed with a channel between the cavities.
2. The positive-negative pressure test device is characterized in that a plurality of interfaces serving as the channels are formed in the device body (1), the interfaces are communicated to the cavity, and the positive pressure test assembly and the negative pressure test assembly are connected with the device body (1) in a flange connection mode.
3. The positive and negative pressure test device according to claim 2, wherein the interface comprises a rough pumping interface (2), a liquid nitrogen inlet and outlet interface (3), a cryogenic pump interface (4), a negative pressure pumping interface (5) and a negative pressure gas charging interface (6); the negative pressure test assembly comprises a rough pump communicated with the rough pump connector (2), a liquid nitrogen device communicated with the liquid nitrogen inlet and outlet connector (3), a cryogenic pump communicated with the cryogenic pump connector (4), an air pump communicated with the negative pressure air pumping connector (5) and a first air pump communicated with the negative pressure air inflation connector (6).
4. The positive-negative pressure test device according to claim 3, wherein the negative pressure test assembly further comprises a vacuum gauge for measuring the pressure inside the cavity, the interface further comprises a negative pressure measurement interface (7), the vacuum gauge is connected with the negative pressure measurement interface (7) through a positive pressure ball valve and a vacuum valve, a display instrument for receiving signals of the vacuum gauge is further mounted on the device body (1), and the upper limit value and the lower limit value of the display instrument are respectively interlocked with the air pump and the first air pump;
when the vacuum gauge signal is higher than the upper limit value, the air pump is started, and the first air pump is stopped; and when the vacuum gauge signal is lower than the lower limit value, the first air pump is started, and the air pump is stopped.
5. The positive and negative pressure test device according to any one of claims 2 to 4, wherein the interface further comprises a positive pressure inflation and deflation interface (8), and the positive pressure test assembly comprises a second inflator pump communicated with the positive pressure inflation and deflation interface (8).
6. The positive and negative pressure test device according to claim 5, wherein the positive pressure test assembly comprises a positive pressure gauge for measuring the air pressure within the cavity, the interface further comprising a positive pressure measurement interface (9), the positive pressure gauge being mounted on the positive pressure measurement interface (9).
7. The positive-negative pressure test device according to claim 2, 3 or 4, wherein the interface comprises a connecting pipe, the flange and an outer flange pipeline which are sequentially connected, a first end of the connecting pipe is connected to the device body (1), a second end of the connecting pipe is sleeved with the flange, one end of the outer flange pipeline is fixedly connected with the flange, and the other end of the outer flange pipeline is a free end; and a positive pressure ball valve and a vacuum valve are assembled in the outer pipeline of the flange.
8. The positive and negative pressure test device as claimed in claim 7, wherein the flanges comprise a first flange close to the connection pipe and a second flange matched with the first flange, the first flange is provided with a trapezoidal sealing groove, and an O-shaped fluororubber sealing ring is installed in the sealing groove.
9. Positive and negative pressure test device according to claim 3 or 4, characterized in that the cryogenic pump is provided with a vacuum gate valve and the roughing pump is provided with a vacuum flapper valve.
10. The positive-negative pressure test device according to any one of claims 1 to 4, wherein the device body (1) comprises a first body (101) and a second body (102), the first body (101) and the second body (102) form a complete cavity when connected, and the first body (101) and the second body (102) are connected in a sealing manner through a sealing device (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123393115.6U CN217059301U (en) | 2021-12-30 | 2021-12-30 | Positive and negative pressure test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123393115.6U CN217059301U (en) | 2021-12-30 | 2021-12-30 | Positive and negative pressure test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217059301U true CN217059301U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123393115.6U Active CN217059301U (en) | 2021-12-30 | 2021-12-30 | Positive and negative pressure test device |
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| CN (1) | CN217059301U (en) |
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2021
- 2021-12-30 CN CN202123393115.6U patent/CN217059301U/en active Active
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