Bridge type loading loop for storing low-temperature medium and working method of bridge type loading loop

Abstract

The invention discloses a bridge type loading loop for storing a low-temperature medium and a working method of the bridge type loading loop. The bridge type loading loop comprises two low-temperature storage loading cylinders, an overflow valve and six switching valves. According to the bridge type loading loop, firstly, low-temperature circulation is carried out, a medium reaching the temperature required by a product is stored in the two low-temperature storage loading cylinders, then the low-temperature medium in the low-temperature loading cylinders is injected into the product by utilizing the one-way conduction characteristic of the one-way valves on the pistons of the low-temperature storage loading cylinders, and then the product is loaded. Therefore, the problem of medium temperature rise caused by long distance between the low-temperature medium source and the product is solved. The low-temperature medium loading device can stably and reliably load the low-temperature medium to the tested product, and is easy to process and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a bridge loading circuit for storing cryogenic media and its working method. Background Art

[0002] In some hydraulic test systems for testing products under extreme conditions, it is often necessary to reduce the temperature of the test medium to the extreme temperature of the medium. Due to the different test conditions of the products under test, the pump station energy and the test device are often at a certain distance from each other. At the same time, when the hydraulic medium passes through throttle components such as overflow valves and pressure reducing valves, corresponding temperature rises will occur. Therefore, it is difficult to ensure that the medium temperature is transmitted from the pump station energy to the product and the medium temperature remains stable all the time.

[0003] Therefore, in order to meet the temperature requirements of some products for cryogenic media with a long transmission distance, it is necessary to develop a bridge loading circuit for storing cryogenic media. Summary of the Invention

[0004] The purpose of the present invention is to provide a bridge loading circuit for storing cryogenic media and its working method.

[0005] The technical solution for achieving the purpose of the present invention is: A bridge loading circuit for storing cryogenic media, including a first cryogenic storage loading cylinder, a second cryogenic storage loading cylinder, an overflow valve, and a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, a fifth switching valve, and a sixth switching valve;

[0006] The oil path is divided into three paths after the P port of the loop medium inlet, and is respectively connected to the inlets of the first switching valve, the second switching valve, and the fifth switching valve: Among them, the outlet of the first switching valve is divided into three paths, and is respectively connected to the A chamber of the first cryogenic storage loading cylinder, the A chamber of the second cryogenic storage loading cylinder, and the inlet of the fourth switching valve; the outlet of the second switching valve is divided into three paths, and is respectively connected to the B chamber of the first cryogenic storage loading cylinder, the B chamber of the second cryogenic storage loading cylinder, and the inlet of the third switching valve; the outlet of the fifth switching valve is divided into four paths, and is respectively connected to the outlet of the third switching valve, the outlet of the fourth switching valve, the inlet of the sixth switching valve, and the inlet of the overflow valve; the outlet of the sixth switching valve is connected to the product; the outlet of the overflow valve is connected to the fuel tank of the cryogenic medium.

[0007] Furthermore, the structural composition of the second cryogenic storage loading cylinder is exactly the same as that of the first cryogenic storage loading cylinder.

[0008] Further, the first low-temperature storage and loading cylinder mainly consists of an oil cylinder barrel, a sealing ring, a cover plate for chamber A, a cover plate for chamber B, a connector for chamber A, a connector for chamber B, a piston, a sealing pair, a check valve, and a proximity switch; the cover plate for chamber A and the cover plate for chamber B are respectively installed at both ends of the oil cylinder barrel, the sealing ring is installed in the grooves of the cover plate for chamber A and the cover plate for chamber B and is closely attached to the oil cylinder barrel, and the oil cylinder barrel, the sealing ring, the cover plate for chamber A, and the cover plate for chamber B form a low-temperature medium storage cavity; the connector for chamber A and the connector for chamber B are respectively installed on the cover plate for chamber A and the cover plate for chamber B and are medium inlet and outlet interfaces; the piston is installed inside the oil cylinder barrel and forms a sliding pair with the oil cylinder barrel to form chamber A and chamber B inside the oil cylinder barrel. Two circles of sealing pairs are installed in the grooves of the piston to ensure that the media in chamber A and chamber B cannot flow through the gap between the piston and the oil cylinder barrel; the check valve is located at the center of the piston, and the medium can only flow from chamber A into chamber B through the check valve; the proximity switch is installed on the cover plate for chamber A, and its detection end is located inside the oil cylinder passage to detect whether the piston moves to closely adhere to the cover plate for chamber A.

[0009] The present invention also provides a working method for the above-mentioned bridge-type loading circuit for storing low-temperature media, including the following steps:

[0010] Connect the medium inlet of the bridge-type loading circuit for storing low-temperature media to the liquid outlet of the low-temperature medium source, connect the outlet of the sixth switching valve to the product medium inlet, and connect the product outlet and the outlet of the overflow valve to the storage tank of the low-temperature medium source;

[0011] When it is necessary to provide product low-temperature media, open the fifth switching valve, keep all other switching valves closed, adjust the overflow pressure of the overflow valve to 0, and then start the pump and cooling equipment of the low-temperature medium source. The low-temperature medium returns to the low-temperature medium source through the fifth switching valve and the overflow valve for circulating cooling;

[0012] After the medium temperature approaches the required value, adjust the pressure of the overflow valve to the pressure required by the product, open the first switching valve and the third switching valve, close the fifth switching valve, and keep the remaining switching valves closed. At this time, the medium enters the first low-temperature storage and loading cylinder and the second low-temperature storage and loading cylinder respectively through the first switching valve, pushing the pistons of the two cylinders to move from the side of the cover plate for chamber A to the cover plate for chamber B. At this time, the check valve is in the conducting state. After the B chambers of the first low-temperature storage and loading cylinder and the second low-temperature storage and loading cylinder are filled with the medium, the medium continues to pass through the check valve, passes through the switching valve and the overflow valve, and finally returns to the medium storage tank of the low-temperature clean source for continuous circulating cooling;

[0013] After the temperature of the medium to be circulated reaches the final target temperature requirement, simultaneously open the second, fourth, and sixth switching valves, and close the first and third switching valves. At this time, after the medium enters the loop from the P port, it flows into the B chambers of the two low-temperature loading cylinders through the second switching valve. The check valve is in the closed state at this time, and the medium pushes the piston to load the medium in the A chamber into the test product through the fourth and sixth switching valves.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By means of two groups of low-temperature storage and loading cylinders, the problem of medium temperature rise caused by the long distance between the low-temperature medium source (composed of a pump, a cooling device, and a medium storage tank, which can cool and discharge the medium) and the product is eliminated. The low-temperature medium can be stably and reliably loaded into the test product, and it is easy to process with low cost; (2) The designed bridge-type loading loop for storing low-temperature medium in the present invention can adapt to the characteristics of a small on-site space and high environmental requirements of the product; (3) The bridge-type loading loop for the low-temperature medium can realize the serialization of products according to the loading volume and loading pressure, and has a large market space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of the bridge-type loading loop for storing low-temperature medium in the embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the low-temperature storage and loading cylinder in the embodiment of the present invention.

[0018] Figure 3 It is a three-dimensional schematic diagram of the low-temperature storage and loading cylinder in the embodiment of the present invention.

[0019] Reference numerals: 1-1 First low-temperature storage and loading cylinder; 1-2 Second low-temperature storage and loading cylinder; 2 Relief valve; 3-1 First switching valve; 3-2 Second switching valve; 3-3 Third switching valve; 3-4 Fourth switching valve; 3-5 Fifth switching valve; 3-6 Sixth switching valve; 1-1-1 Cylinder barrel; 1-1-2 Sealing ring; 1-1-3 A-chamber cover plate; 1-1-4 B-chamber cover plate; 1-1-5 A-chamber joint; 1-1-6 B-chamber joint; 1-1-7 Piston; 1-1-8 Sealing pair; 1-1-9 Proximity switch; 1-1-10 Check valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] As Figure 1 shown, the described bridge loading circuit for storing cryogenic media includes a first cryogenic storage loading cylinder 1-1, a second cryogenic storage loading cylinder 1-2, a relief valve 2, and a first switching valve 3-1, a second switching valve 3-2, a third switching valve 3-3, a fourth switching valve 3-4, a fifth switching valve 3-5, and a sixth switching valve 3-6.

[0024] After the P port of the circuit medium inlet, the oil path is divided into three paths, which are respectively connected to the inlets of the first switching valve 3-1, the second switching valve 3-2, and the fifth switching valve 3-5: Among them, the outlet of the first switching valve 3-1 is divided into three paths, which are respectively connected to the A chamber of the first cryogenic storage loading cylinder 1-1, the A chamber of the second cryogenic storage loading cylinder 1-2, and the inlet of the fourth switching valve 3-4; the outlet of the second switching valve 3-2 is divided into three paths, which are respectively connected to the B chamber of the first cryogenic storage loading cylinder 1-1, the B chamber of the second cryogenic storage loading cylinder 1-2, and the inlet of the third switching valve 3-3; the outlet of the fifth switching valve 3-5 is divided into four paths, which are respectively connected to the outlet of the third switching valve 3-3, the outlet of the fourth switching valve 3-4, the inlet of the sixth switching valve 3-6, and the inlet of the relief valve 2.

[0025] The outlet of the described sixth switching valve 3-6 is connected to the product; the outlet of the relief valve 2 is connected to the fuel tank of the cryogenic medium.

[0026] As Figure 2 、 Figure 3As shown in the figure, the low-temperature storage loading cylinder mainly consists of an oil cylinder barrel 1-1-1, a sealing ring 1-1-2, an A-chamber cover plate 1-1-3, a B-chamber cover plate 1-1-4, an A-chamber joint 1-1-5, a B-chamber joint 1-1-6, a piston 1-1-7, a sealing pair 1-1-8, a check valve 1-1-10, a proximity switch 1-1-9, etc. The oil cylinder barrel 1-1-1, the sealing ring 1-1-2, the A-chamber cover plate 1-1-3, and the B-chamber cover plate 1-1-4 provide a storage cavity for the low-temperature medium; the A-chamber joint 1-1-5 and the B-chamber joint 1-1-6 are medium inlet and outlet interfaces and can be connected to the low-temperature bridge loading circuit; the piston 1-1-7 and the oil cylinder barrel 1-1-1 form a sliding pair, forming an A-chamber and a B-chamber inside the oil cylinder barrel. Two circles of sealing pairs are installed in the groove of the piston 1-1-7 to ensure that the media in the A-chamber and the B-chamber cannot flow through the gap between the piston and the oil cylinder barrel; the check valve 1-1-10 is located at the center of the piston, and the medium can only flow from the A-chamber into the B-chamber through the check valve; the proximity switch 1-1-9 is installed on the A-chamber cover plate 1-1-3, and its detection end is located inside the oil cylinder, and it can detect whether the piston 1-1-7 moves to abut against the A-chamber cover plate.

[0027] The working principle of the first low-temperature storage loading cylinder 1-1 is as follows: Before the system works, the medium enters the A-chamber through the A-chamber joint 1-1-5. The medium pushes the piston 1-1-7 to move to the right. At the same time, the medium flows into the B-chamber through the check valve 1-1-10 and flows out of the low-temperature storage loading cylinder through the B-chamber joint 1-1-6; when the test system needs to be loaded with the medium, the medium is flowed into the B-chamber through the B-chamber joint 1-1-6. The piston 1-1-7 is driven to move to the left under the pressure difference of the media in the B-chamber and the A-chamber, and then the medium in the A-chamber flows through the A-chamber joint 1-1-5 to the test product until the piston 1-1-7 moves to abut against the A-chamber cover plate. After the proximity switch 1-1-9 senses the feedback signal, the loading of the medium through the B-chamber joint 1-1-6 is stopped, and the loading work of the low-temperature storage loading cylinder is completed.

[0028] The structural composition and working principle of the second low-temperature storage loading cylinder 1-2 are exactly the same as those of the first low-temperature storage loading cylinder 1-1, and it also mainly consists of an oil cylinder barrel, a sealing ring, an A-chamber cover plate, a B-chamber cover plate, an A-chamber joint, a B-chamber joint, a piston, a sealing pair, a check valve, a proximity switch, etc. The structure is referred to in Attachment Figure 2 、Attachment Figure 3 .

[0029] Now, a specific application occasion of the present invention for providing a low-temperature (constant) liquid medium for a product will be described in detail.

[0030] First, connect the medium inlet (P port) of the bridge loading circuit for storing cryogenic medium to the liquid outlet of the cryogenic medium source (composed of a pump, a cooling device, and a medium storage tank, which can cool and discharge the medium); connect the outlet of the sixth switching valve 3-6 to the product medium inlet; connect both the product outlet and the outlet of the overflow valve 2 to the storage tank of the cryogenic medium source.

[0031] When it is necessary to supply the product with cryogenic medium, only open the fifth switching valve 3-5, and keep all other switching valves closed. Adjust the overflow pressure of the overflow valve 2 to 0, then start the pump and cooling device of the cryogenic medium source. The cryogenic medium circulates and cools back to the cryogenic medium source via the fifth switching valve 3-5 and the overflow valve 2.

[0032] After the medium temperature approaches the required value, adjust the pressure of the overflow valve 2 to the pressure required by the product. Open the first switching valve 3-1 and the third switching valve 3-3, close the fifth switching valve 3-5, and keep the remaining switching valves closed. At this time, the medium enters the first cryogenic storage loading cylinder 1-1 and the second cryogenic storage loading cylinder 1-2 through the first switching valve 3-1 respectively, pushing the pistons 1-1-7 and 1-2-7 of the two cylinders to move from the side of the A chamber cover plate 1-1-3 to the B chamber cover plate 1-1-4. At this time, the check valve 1-1-9 is in the conducting state. After the B chambers of the first cryogenic storage loading cylinder 1-1 and the second cryogenic storage loading cylinder 1-2 are filled with the medium, the medium continues to pass through the check valve, passes through the switching valve 3-3 and the overflow valve 2, and finally returns to the medium storage tank of the cryogenic clean source for continuous circulation cooling.

[0033] After the circulating medium temperature reaches the final specified temperature requirement, simultaneously open the second switching valve 3-2, the fourth switching valve 3-4, and the sixth switching valve 3-6, and close the first switching valve 3-1 and the third switching valve 3-3. At this time, after the medium enters the circuit from the P port, it flows into the B chambers of the two cryogenic loading cylinders through the second switching valve 3-2. The check valve 1-1-9 is in the closed state due to its working principle at this time. Therefore, the medium pushes the piston to load the medium in the A chamber into the test product through the fourth switching valve 3-4 and the sixth switching valve 3-6. In this way, the temperature of the medium loaded into the test product is guaranteed to the greatest extent, and the reliability of the test of the test product is improved.

[0034] In summary, a bridge loading circuit for storing cryogenic medium according to the present invention realizes stable and reliable loading of cryogenic medium to a test product through two groups of cryogenic storage loading cylinders, is easy to process, has a low cost, and achieves good use effects. At present, the demand for testing extreme temperatures in domestic reliability test systems is gradually increasing. Therefore, this loading circuit has great market potential. Subsequently, the bridge loading circuit of this cryogenic medium can be serialized according to the loading volume and loading pressure, having a large market space.

[0035] The above are only the main features, working principles and advantages of the present invention. For those skilled in the art, the present invention is not limited by the above embodiments. Without departing from its basic principles, the present invention can be flexibly changed and varied for different embodiments. These changes and variations, as long as they are within the spirit and scope of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A bridge-loading circuit for storing cryogenic media, characterized in that, It includes a first low-temperature storage loading cylinder (1-1), a second low-temperature storage loading cylinder (1-2), a relief valve (2), a first switching valve (3-1), a second switching valve (3-2), a third switching valve (3-3), a fourth switching valve (3-4), a fifth switching valve (3-5) and a sixth switching valve (3-6); The oil path is divided into three paths after the P port of the loop medium inlet, and is respectively connected to the inlets of the first switching valve (3-1), the second switching valve (3-2) and the fifth switching valve (3-5): Among them, the outlet of the first switching valve (3-1) is divided into three paths, and is respectively connected to the A chamber of the first low-temperature storage loading cylinder (1-1), the A chamber of the second low-temperature storage loading cylinder (1-2) and the inlet of the fourth switching valve (3-4); the outlet of the second switching valve (3-2) is divided into three paths, and is respectively connected to the B chamber of the first low-temperature storage loading cylinder (1-1), the B chamber of the second low-temperature storage loading cylinder (1-2) and the inlet of the third switching valve (3-3); the outlet of the fifth switching valve (3-5) is divided into four paths, and is respectively connected to the outlet of the third switching valve (3-3), the outlet of the fourth switching valve (3-4), the inlet of the sixth switching valve (3-6) and the inlet of the relief valve (2); the outlet of the sixth switching valve (3-6) is connected to the product; the outlet of the relief valve (2) is connected to the fuel tank of the low-temperature medium.

2. The bridge loading circuit for storing cryogenic media according to claim 1, wherein, The structural composition and working principle of the second low-temperature storage loading cylinder (1-2) are the same as those of the first low-temperature storage loading cylinder (1-1).

3. The bridge loading circuit for storing cryogenic media according to claim 2, characterized in that, The first low-temperature storage loading cylinder (1-1) mainly consists of an oil cylinder barrel (1-1-1), a sealing ring (1-1-2), a cover plate for chamber A (1-1-3), a cover plate for chamber B (1-1-4), a connector for chamber A (1-1-5), a connector for chamber B (1-1-6), a piston (1-1-7), a sealing pair (1-1-8), a check valve (1-1-10), and a proximity switch (1-1-9); the cover plate for chamber A (1-1-3) and the cover plate for chamber B (1-1-4) are respectively installed at both ends of the oil cylinder barrel (1-1-1), the sealing ring (1-1-2) is installed in the grooves of the cover plate for chamber A (1-1-3) and the cover plate for chamber B (1-1-4), and is in close contact with the oil cylinder barrel (1-1-1). The oil cylinder barrel (1-1-1), the sealing ring (1-1-2), the cover plate for chamber A (1-1-3), and the cover plate for chamber B (1-1-4) form a low-temperature medium storage cavity; the connector for chamber A (1-1-5) and the connector for chamber B (1-1-6) are respectively installed on the cover plate for chamber A (1-1-3) and the cover plate for chamber B (1-1-4), and are the medium inlet and outlet interfaces; the piston (1-1-7) is installed inside the oil cylinder barrel (1-1-1) and forms a sliding pair with the oil cylinder barrel (1-1-1), forming chamber A and chamber B inside the oil cylinder barrel. Two circles of sealing pairs (1-1-8) are installed in the grooves of the piston (1-1-7) to ensure that the media in chamber A and chamber B cannot flow through the gap between the piston and the oil cylinder barrel; the check valve (1-1-10) is located at the center of the piston, and the medium can only flow from chamber A into chamber B through the check valve; the proximity switch (1-1-9) is installed on the cover plate for chamber A (1-1-3), and its detection end is located inside the oil cylinder, for detecting whether the piston (1-1-7) moves to be close to the cover plate for chamber A.

4. A working method of a bridge loading circuit for storing cryogenic media as described in any one of claims 1 to 3, characterized in that, Including: Connect the medium inlet of the bridge-type loading circuit for storing low-temperature medium to the liquid outlet of the low-temperature medium source, connect the outlet of the sixth switching valve (3-6) to the product medium inlet, and connect the product outlet and the overflow valve outlet to the storage tank of the low-temperature medium source; When it is necessary to provide low-temperature product medium, open the fifth switching valve (3-5), keep all other switching valves closed, adjust the overflow pressure of the overflow valve (2) to 0, and then start the pump and cooling equipment of the low-temperature medium source. The low-temperature medium returns to the low-temperature medium source through the fifth switching valve (3-5) and the overflow valve (2) for circulating cooling; After the medium temperature approaches the required value, adjust the pressure of the overflow valve (2) to the pressure required by the product. Open the first switching valve (3-1) and the third switching valve (3-3), close the fifth switching valve (3-5), and keep the other switching valves closed. At this time, the medium enters the first low-temperature storage loading cylinder (1-1) and the second low-temperature storage loading cylinder (1-2) through the first switching valve (3-1) respectively, pushing the pistons of the two cylinders to move from the side of the A-chamber cover plate to the B-chamber cover plate. At this time, the check valve is in the conducting state, and the medium fills the B-chambers of the first low-temperature storage loading cylinder (1-1) and the second low-temperature storage loading cylinder (1-2) and then continues to pass through the check valve, passes through the switching valve (3-3) and the overflow valve (2), and finally returns to the medium storage tank of the low-temperature clean source to continue the cycle cooling; After the circulating medium temperature reaches the final specified temperature requirement, open the second switching valve (3-2), the fourth switching valve (3-4) and the sixth switching valve (3-6) simultaneously, and close the first switching valve (3-1) and the third switching valve (3-3); At this time, after the medium enters the circuit from the P port, it flows into the B-chambers of the two low-temperature loading cylinders through the second switching valve (3-2). The check valve is in the closed state at this time, and the medium pushes the piston to load the medium in the A-chamber into the test product through the fourth switching valve (3-4) and the sixth switching valve (3-6).

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