Large-diameter liquid nitrogen pump

Abstract

The application discloses a large-diameter liquid nitrogen pump, which comprises a quick connector, a heat sink, a safety valve, a sealing nut, a pressing screw, a screw, a pressing plate, an outer upper sleeve, an outer sealing ring, an outer lower sleeve, a pump head, a pump rod, a liquid discharge pipe, a pressure gauge, a liquid discharge valve, an inner upper sleeve, an inner sealing ring and an inner lower sleeve, the heat sink is provided with the quick connector on the top and is threadedly connected with the top of the pump rod at the bottom, the safety valve and the pressure gauge are arranged on the upper portion of the pump rod, the liquid discharge pipe is arranged in the pump rod, the inner hole of the pump head is in sliding fit with the pump rod, an annular hole is arranged on the top of the pump head and the inner sealing ring, the inner lower sleeve and the inner upper sleeve are arranged in the annular hole, the sealing nut is screw-connected with the top of the pump head, the pressing plate is uniformly arranged on the plane of the pump head through the screw, the pressing screw is screw-connected with the pressing plate, and the outer sealing ring, the outer lower sleeve and the outer upper sleeve are respectively sleeved on the outer circle of the pump head. Compared with the prior art, the large-diameter liquid nitrogen pump has the advantages of good sealing effect, convenient operation and labor saving.

Description

Technical fields:

[0001] This invention relates to the field of liquid nitrogen transportation, and is particularly applicable to a large-diameter liquid nitrogen pump. Background technology:

[0002] Currently, the common method for extracting liquid nitrogen from liquid nitrogen containers is to use a liquid nitrogen pump. Current liquid nitrogen pumps rely on a tightening nut to deform the sealing ring, sealing the pump body to the inner opening of the liquid nitrogen container and thus allowing liquid to drain. This structure works well for small-diameter (≤80mm) liquid nitrogen containers. However, when used on large-diameter liquid nitrogen containers (>80mm), this sealing structure requires manual tightening of the tightening nut. Due to limited human strength, the sealing ring cannot be fully tightened, leading to a poor seal between the pump body and the inner opening of the liquid nitrogen container. This can cause leaks or the pump body to pop out under pressure during use, affecting the normal operation of the liquid nitrogen pump. Summary of the Invention:

[0003] The purpose of this invention is to design a large-diameter liquid nitrogen pump that has good sealing performance, is easy to operate, and saves effort.

[0004] The technical solution to achieve the objective of this invention is: a large-diameter liquid nitrogen pump, comprising a quick-connect coupling, a heat dissipation sleeve, a safety valve, a sealing nut, a clamping screw, a screw, a pressure plate, an outer upper sleeve, an outer sealing ring, an outer lower sleeve, a pump head, a pump rod, a drain pipe, a pressure gauge, a drain valve, an inner upper sleeve, an inner sealing ring, an inner lower sleeve, and a liquid nitrogen container. The quick-connect coupling is installed on the top of the heat dissipation sleeve. The top of the pump rod is threaded to the bottom of the heat dissipation sleeve for sealing. The safety valve is installed on one side of the upper part of the pump rod and communicates with the inner hole of the pump rod. The pressure gauge is installed on the front of the upper part of the pump rod and communicates with the inner hole of the pump rod. The top of the drain pipe is bent at 90° and... The pump rod extends from the opening on its side and is welded and sealed. The lower part extends downward from the pump rod hole to the outside of the pump rod. The drain valve is connected to the drain pipe. The inner hole of the pump head is slidably fitted with the pump rod. An annular hole is provided at its top and an inner sealing ring, an inner lower sleeve, and an inner upper sleeve are placed there. The sealing nut is screwed to the top of the pump head. The pressure plate is evenly arranged on the circumference of the pump head plane by screws. The clamping screw is screwed to the pressure plate. The outer sealing ring, the outer lower sleeve, and the outer upper sleeve are respectively fitted on the outer circle of the pump head. The outer circle of the outer sealing ring is fitted with the inner wall of the neck of the liquid nitrogen container. At least two clamping screws are arranged and their front ends are spherical. Attached image description:

[0005] Figure 1 This is a schematic diagram of the structure of the present invention.

[0006] Figure 2 This is a schematic diagram of the sealing structure of the present invention. Detailed implementation method:

[0007] To address the shortcomings of poor sealing in existing large-diameter liquid nitrogen pumps, this invention employs the following technical solution: A quick-connect fitting 1 is installed on the top of the heat sink 2; the top of the pump rod 12 is threaded to the bottom of the heat sink 2 for sealing; a safety valve 3 is installed on the upper side of the pump rod and communicates with the inner hole of the pump rod; a pressure gauge 14 is installed on the upper front of the pump rod and communicates with the inner hole of the pump rod; the top of the drain pipe 13 is bent at 90° and extends from an opening on the side of the pump rod, where it is welded and sealed; the lower part extends downwards from the pump rod hole to the outside of the pump rod; and a drain valve 15 is connected to the drain pipe. The inner hole of the pump head 11 slides with the pump rod. A ring hole is provided at the top of the pump head to hold two inner sealing rings 17, an inner lower sleeve 18, and an inner upper sleeve 16. The sealing nut 4 is screwed to the top of the pump head. The inner sealing rings are pressed by rotating the sealing nut, thereby sealing the pump head and the pump rod. The pressure plate 7 is evenly pressed on the circumference of the pump head plane by the screw 6. The pressing screw 5 is screwed to the pressure plate. The two outer sealing rings 9, the outer lower sleeve 10, and the outer upper sleeve 8 are respectively fitted on the outer circle of the pump head. The outer circle of the outer sealing ring contacts and seals the inner wall of the neck of the liquid nitrogen container 19.

[0008] Working Principle: Install the outer sealing ring, lower outer sleeve, and upper outer sleeve sequentially on the pump head. Then install the pressure plate and clamping screws. Place the assembled pump head assembly into the neck of the liquid nitrogen container. Tighten the clamping screws diagonally, pressing the upper and lower outer sleeves downwards to fully compress and deform the two outer sealing rings, thus sealing the pump head between the neck of the liquid nitrogen container and the outer circle of the pump head. Next, install the inner sealing ring, lower inner sleeve, and upper inner sleeve sequentially into the annular hole at the top of the pump head. Screw the sealing nut onto the threads at the top of the pump head. Install the quick-connect fitting, heat sink, safety valve, pressure gauge, and drain valve sequentially onto the pump rod. Insert the pump rod into the inner hole of the sealing nut. When the drain pipe touches the bottom of the liquid nitrogen container, lift it upwards by 1-3 cm. Tighten the sealing nut, pressing the upper and lower inner sleeves downwards to compress and deform the two inner sealing rings, thus sealing the pump rod between the pump rod and the inner annular hole of the pump head.

[0009] When liquid nitrogen needs to be discharged, connect the discharge pipe, open the discharge valve, and introduce compressed gas through the quick-connect interface. The compressed gas enters the top of the liquid nitrogen container through the gap between the heat sink, pump rod, and discharge pipe. Since the pump head, the neck of the liquid nitrogen container, and the pump rod are all sealed, the internal pressure of the liquid nitrogen container rises, discharging the liquid nitrogen through the discharge pipe and discharge valve to the designated container. After discharge is complete, close the inlet and discharge valves, open the safety valve to release pressure, and the entire process is complete after pressure release.

Claims

1. A large-diameter liquid nitrogen pump, comprising a quick-connect coupling, a heat dissipation sleeve, a safety valve, a sealing nut, a clamping screw, a screw, a pressure plate, an outer upper sleeve, an outer sealing ring, an outer lower sleeve, a pump head, a pump rod, a drain pipe, a pressure gauge, a drain valve, an inner upper sleeve, an inner sealing ring, an inner lower sleeve, and a liquid nitrogen container, characterized in that... The quick-connect fitting is installed on the top of the heat sink sleeve. The top of the pump rod and the bottom of the heat sink sleeve are sealed by a threaded connection. The safety valve is installed on the upper side of the pump rod and communicates with the inner hole of the pump rod. The pressure gauge is installed on the upper front of the pump rod and communicates with the inner hole of the pump rod. The top of the drain pipe is bent at 90° and extends out from the opening on the side of the pump rod and is welded and sealed. The lower part extends downward from the pump rod hole to the outside of the pump rod. The drain valve is connected to the drain pipe. The inner hole of the pump head is slidably fitted with the pump rod. An annular hole is provided at its top and an inner sealing ring, an inner lower sleeve, and an inner upper sleeve are placed there. The sealing nut is screwed to the top of the pump head. The pressure plate is evenly arranged on the circumference of the flat surface of the pump head by screws. The clamping screw is screwed to the pressure plate. The outer sealing ring, the outer lower sleeve, and the outer upper sleeve are respectively fitted on the outer circle of the pump head. The outer circle of the outer sealing ring is fitted with the inner wall of the neck of the liquid nitrogen container.

2. The large-diameter liquid nitrogen pump as described in claim 1, characterized in that... At least two clamping screws are arranged.

3. A large-diameter liquid nitrogen pump as described in claim 1, characterized in that... The front end of the clamping screw is spherical.

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