Novel portable liquid nitrogen recondensation refrigeration high-purity germanium detector

Abstract

The utility model discloses a novel portable liquid nitrogen recondensation refrigeration high-purity germanium detector, which comprises a Dewar tank, a low-temperature refrigerator, a cold guide rod, a vacuum mechanism and a high-purity germanium detector, liquid nitrogen is filled in the Dewar tank, the low-temperature refrigerator is arranged at the Dewar tank, the refrigeration end of the low-temperature refrigerator is inserted into the Dewar tank, and the refrigeration end of the low-temperature refrigerator is connected with the high-purity germanium detector. The vacuum mechanism is mounted at one end of the Dewar tank, the high-purity germanium detector is mounted in the vacuum mechanism, and the cold guide rod is connected with the high-purity germanium detector and the Dewar tank; according to the novel portable liquid nitrogen recondensation refrigeration high-purity germanium detector, the interior of the Dewar tank can be cooled through the low-temperature refrigerator, gasified nitrogen in the Dewar tank is condensed into liquid nitrogen, and then the high-purity germanium detector is in a low-temperature state through the heat exchange effect of the cold conduction copper rod; the detector is small in size and convenient to carry by a user, nitrogen in the Dewar tank can be effectively condensed into liquid nitrogen, the filling frequency of the liquid nitrogen is effectively reduced, and electromagnetic interference of a circuit system on the high-purity germanium detector is reduced.

Description

Technical Field

[0001] This utility model relates to the field of high-purity germanium detector technology, specifically a novel portable high-purity germanium detector cooled by liquid nitrogen recondensation. Background Technology

[0002] High-purity germanium detectors are widely used in environmental protection, nuclear power, homeland security, and scientific research due to their excellent energy resolution and high detector efficiency. However, high-purity germanium detectors require a cryogenic environment to operate, and conventionally, liquid nitrogen or cryogenic refrigerators are used as the cold source to bring the detector in the system to its operating temperature. Traditional liquid nitrogen refrigeration systems have poor performance, require frequent replenishment of liquid nitrogen, and are cumbersome and inconvenient to operate. While electric refrigeration allows high-purity germanium to operate as long as there is electricity, greatly improving the system's convenience, existing electric refrigeration systems directly affect the high-purity germanium detector, causing it to be subject to a large amount of electromagnetic interference, affecting the detection accuracy. Existing electric refrigeration structures are complex, costly, and bulky, making them inconvenient for users to carry. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a novel portable high-purity germanium detector cooled by liquid nitrogen recondensation.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A novel portable liquid nitrogen condensation-cooled high-purity germanium detector includes a Dewar jar, a cryogenic refrigerator, a cooling rod, a vacuum mechanism, and a high-purity germanium detector. The Dewar jar is filled with liquid nitrogen. The cryogenic refrigerator is installed at the Dewar jar, with its cooling end inserted into the Dewar jar. The vacuum mechanism is installed at one end of the Dewar jar, and the high-purity germanium detector is installed inside the vacuum mechanism. One end of the cooling rod abuts against the high-purity germanium detector, and the cooling rod is installed inside the vacuum mechanism. The other end of the cooling rod is inserted into the Dewar jar.

[0006] Furthermore, the cryogenic refrigerator is installed in the vacuum jacket of the Dewar jar.

[0007] Furthermore, the cooling rod is a cooling copper rod.

[0008] Furthermore, a filling port is provided on one side of the Dewar can.

[0009] Furthermore, the vacuum mechanism includes a vacuum tube and a vacuum shroud. One end of the vacuum tube is fixedly connected to the Dewar jar, and the other end of the vacuum tube is provided with a vacuum shroud. A high-purity germanium detector is installed inside the vacuum shroud, and a cooling copper rod is installed in the vacuum tube.

[0010] Furthermore, the cooling rod has an "L" shaped structure, and the bent end of the cooling rod is inserted into the Dewar jar.

[0011] Compared with the prior art, this utility model provides a novel portable liquid nitrogen recondensation-cooled high-purity germanium detector, which has the following beneficial effects:

[0012] This novel portable liquid nitrogen re-condensation cooled high-purity germanium detector utilizes a cryogenic refrigerator installed in the vacuum jacket of a Dewar flask. This refrigerator cools the interior of the Dewar flask, causing the vaporized nitrogen to condense into liquid nitrogen. This liquid nitrogen is then cooled by a cooling copper rod, keeping the high-purity germanium detector at a low temperature, thus enabling it to function normally. The detector is small and portable. Through the synergistic effect of liquid nitrogen and the cryogenic refrigerator, the nitrogen inside the Dewar flask is effectively re-condensed into liquid nitrogen, significantly reducing the frequency of liquid nitrogen refills and minimizing electromagnetic interference from the circuitry to the high-purity germanium detector. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present utility model;

[0014] Figure 2 This is a cross-sectional view of the present invention.

[0015] In the diagram: 1. Dewar jar, 2. Inlet, 3. Cryogenic refrigerator, 4. Cooling copper rod, 5. Vacuum tube, 6. Vacuum hood, 7. High-purity germanium detector. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1 to 2 The present invention provides the following technical solution:

[0018] A novel portable liquid nitrogen condensation-cooled high-purity germanium detector includes a Dewar jar 1, a cryogenic refrigerator 3, a cooling rod, a vacuum mechanism, and a high-purity germanium detector 7. The Dewar jar 1 is used to hold liquid nitrogen, and the cryogenic refrigerator 3 is installed in the vacuum jacket of the Dewar jar 1 to further reduce the loss of cooling capacity. The cryogenic refrigerator 3 is an existing mature product that users can purchase as needed, while improving the system's integration. The cooling end of the cryogenic refrigerator 3 is inserted into the Dewar jar 1 to cool the internal space of the Dewar jar 1, causing the nitrogen gas inside the Dewar jar 1 to condense into liquid nitrogen. The vacuum mechanism is installed at one end of the Dewar jar 1 and is used to install the high-purity germanium detector 7 and the cooling rod, reducing heat exchange between the two and the outside environment. One end of the cooling rod abuts against the high-purity germanium detector 7 and is installed in the vacuum mechanism. The other end of the cooling rod is inserted into the Dewar jar 1, allowing the cooling rod to exchange heat between the interior of the Dewar jar 1 and the high-purity germanium detector 7, thereby reducing the temperature of the high-purity germanium detector 7 and enabling it to operate stably.

[0019] The heat-conducting rod is a heat-conducting copper rod 4, which has good heat exchange performance.

[0020] The Dewar jar 1 has a filling port 2 on one side, which allows the user to fill the Dewar jar 1 with liquid nitrogen. After the liquid nitrogen is filled into the Dewar jar 1, the filling port 2 can be sealed.

[0021] The vacuum mechanism includes a vacuum tube 5 and a vacuum cover 6. One end of the vacuum tube 5 is fixedly connected to the Dewar jar 1, and the other end of the vacuum tube 5 is provided with a vacuum cover 6. The high-purity germanium detector 7 is installed inside the vacuum cover 6, and the cooling copper rod 4 is installed in the vacuum tube 5, so that the high-purity germanium detector 7 and the cooling copper rod 4 are both located in a vacuum environment, reducing the heat exchange between the two and the outside world.

[0022] The cooling rod has an "L" shaped structure, with the bent end inserted into the Dewar jar 1, so that the cooling rod is in full contact with the liquid nitrogen, ensuring the heat exchange efficiency between the high-purity germanium detector 7 and the liquid nitrogen in the Dewar jar 1.

[0023] The specific implementation process is as follows:

[0024] When using this novel portable liquid nitrogen re-condensation cooling high-purity germanium detector, firstly, sufficient liquid nitrogen is poured into the Dewar jar 1 through the filling port 2, and then the filling port 2 is sealed. Then, the cryogenic refrigerator 3 is started, and the cryogenic refrigerator 3 cools the inside of the Dewar jar 1, so that the vaporized nitrogen in the Dewar jar 1 is condensed back into liquid nitrogen. At the same time, the temperature of the liquid nitrogen is conducted to the cooling copper rod 4, and the cooling copper rod 4 conducts heat to the high-purity germanium detector 7, so that the high-purity germanium detector 7 exchanges heat with the liquid nitrogen in the Dewar jar 1, so that the high-purity germanium detector 7 is in a low-temperature state, and thus the high-purity germanium detector 7 can work normally.

[0025] This novel portable liquid nitrogen re-condensation cooled high-purity germanium detector utilizes a cryogenic refrigerator 3 installed in the vacuum jacket of a Dewar flask 1. This refrigerator cools the interior of the Dewar flask 1, causing the vaporized nitrogen to condense into liquid nitrogen. The liquid nitrogen is then cooled by a cooling copper rod 4, keeping the high-purity germanium detector 7 at a low temperature, thus enabling it to operate normally. The detector is small and portable. Through the synergistic effect of liquid nitrogen and the cryogenic refrigerator 3, the nitrogen inside the Dewar flask 1 is effectively re-condensed into liquid nitrogen, significantly reducing the frequency of liquid nitrogen refills and minimizing electromagnetic interference from the circuitry to the high-purity germanium detector 7.

[0026] The above description is merely an embodiment of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the applicability of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A novel portable high-purity germanium detector cooled by liquid nitrogen recondensation, characterized in that: The device includes a Dewar jar, a cryogenic refrigerator, a cooling rod, a vacuum mechanism, and a high-purity germanium detector. The Dewar jar is filled with liquid nitrogen. The cryogenic refrigerator is installed at the Dewar jar, with its cooling end inserted into the Dewar jar. The vacuum mechanism is installed at one end of the Dewar jar, and the high-purity germanium detector is installed inside the vacuum mechanism. One end of the cooling rod is against the high-purity germanium detector, and the cooling rod is installed inside the vacuum mechanism. The other end of the cooling rod is inserted into the Dewar jar.

2. The novel portable liquid nitrogen recondensation-cooled high-purity germanium detector according to claim 1, characterized in that: The cryogenic refrigerator is installed in the vacuum jacket of the Dewar jar.

3. The novel portable liquid nitrogen recondensation-cooled high-purity germanium detector according to claim 1, characterized in that: The cooling rod is a cooling copper rod.

4. The novel portable liquid nitrogen recondensation-cooled high-purity germanium detector according to claim 1, characterized in that: The Dewar can has a filling port on one side.

5. The novel portable liquid nitrogen recondensation-cooled high-purity germanium detector according to claim 1, characterized in that: The vacuum mechanism includes a vacuum tube and a vacuum shroud. One end of the vacuum tube is fixedly connected to the Dewar jar, and the other end of the vacuum tube is equipped with a vacuum shroud. A high-purity germanium detector is installed inside the vacuum shroud, and a cooling copper rod is installed in the vacuum tube.

6. The novel portable liquid nitrogen recondensation-cooled high-purity germanium detector according to claim 1, characterized in that: The cooling rod has an "L" shaped structure, and the bent end of the cooling rod is inserted into the Dewar jar.

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