Mine cooling chilled water high-low pressure conversion device

Abstract

The invention discloses a mine cooling chilled water high-low pressure conversion device which comprises a high-pressure chilled water pressure reduction module and a low-pressure chilled water pressurization module. High-pressure chilled water enters the water tank through the water inlet pipe, pressure relief is conducted through volume buffering of the water tank, then the hydraulic fins are impacted to drive the main shaft and the main gear to rotate, secondary pressure relief is achieved, and low-pressure chilled water is output. The main gear drives the transmission gear to convert rotary motion into reciprocating motion of the sliding rod, a piston in the pressure cylinder is driven to pressurize return water, and check valves are arranged on a liquid inlet branch and a liquid outlet branch to guarantee one-way flow. The device can be arranged in multiple groups in parallel or in series, key parts are made of wear-resistant steel, electrical elements are not included, mechanical transmission is achieved through hydraulic potential energy of high-pressure chilled water, the structure is reliable, the device is suitable for the underground high-humidity high-pressure low-temperature environment, the anti-explosion requirement and the operation risk are lowered, pipe network pressure fluctuation is reduced, and the system energy efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mine cooling machinery, in particular to a mine cooling chilled water high-low pressure conversion device. Background Art

[0002] As shallow coal resources are gradually depleted and mining depths increase rapidly, the problem of high-temperature heat damage in mines is becoming increasingly severe. The high-temperature and high-humidity working environment underground not only harms workers' health but also significantly reduces labor productivity, seriously affecting coal mine safety.

[0003] In order to improve the working environment in mines, improve labor efficiency and safety benefits, and reduce the impact of heat damage in mines, the technology of coal mine refrigeration and cooling has been continuously developed. Initially, it focused on technologies such as improving ventilation and controlling heat sources. However, as the mining depth of mines increases, this type of non-artificial refrigeration and cooling technology has gradually been limited, and mine air conditioning and refrigeration technology has begun to become mainstream.

[0004] When using a centralized surface cooling system, the pressure of surface chilled water reaches over 10 MPa after being transported underground, far exceeding the tolerance of the terminal air cooler. Therefore, the high-pressure chilled water needs to be converted to a low pressure before being delivered to the air cooler. Traditional methods of reducing the pressure of chilled water by building a water storage tank and installing a pressure reducing valve result in significant cooling losses and difficult-to-control pipeline pressure fluctuations. Newer pressure reducing devices using solenoid valves and sensors are complex and prone to damage, and the electrical components used must meet underground explosion-proof requirements, resulting in high equipment costs.

[0005] To this end, the present application designs a mine cooling chilled water high-low pressure conversion device to solve the above problems. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention proposes a high-low pressure conversion device for cooling chilled water in a mine.

[0007] A high-low pressure conversion device for cooling chilled water in a mine, comprising a high-pressure chilled water pressure reducing module and a low-pressure chilled water return pressure increasing module, characterized in that: The high-pressure chilled water pressure reducing module includes a high-pressure chilled water tank, hydraulic fins arranged in the high-pressure chilled water tank, a high-pressure chilled water inlet pipe connected to the chilled water outlet of the ground refrigeration unit, and a low-pressure chilled water outlet pipe connected to the terminal air cooler; the hydraulic fins are fixed to the main shaft, and the main shaft is fixedly connected to the main gear. When high-pressure chilled water enters the high-pressure chilled water tank through the high-pressure chilled water inlet pipe and impacts the hydraulic fins, the main shaft and the main gear are driven to rotate, thereby depressurizing the high-pressure chilled water and outputting low-pressure chilled water to the low-pressure chilled water outlet pipe; The chilled return water boosting module includes a chilled return water inlet pipe connected to the return water end of the downhole air cooler, an inlet branch connected to the boosting cylinder through the chilled return water inlet branch, an outlet branch connected to the chilled return water outlet pipe through the chilled return water outlet branch, a piston arranged in the boosting cylinder, a guide member and a sliding rod linked to the piston, and a transmission gear meshed with the main gear; wherein the transmission gear is constructed to convert the rotational motion of the main gear into the reciprocating motion of the sliding rod, and the sliding rod reciprocates up and down in the guide groove of the guide member to drive the piston to reciprocate in the boosting cylinder, thereby pressurizing the chilled return water entering the boosting cylinder; check valves are respectively provided on the chilled return water inlet branch and the chilled return water outlet branch to limit the one-way flow direction of the fluid to the liquid into the boosting cylinder and the discharge from the boosting cylinder to the chilled return water outlet pipe.

[0008] Furthermore, in order to better implement the present invention, a bearing assembly is provided at the mating portion between the high-pressure freezing water tank and the main shaft to reduce rotational resistance and improve sealing and wear resistance.

[0009] Furthermore, in order to better implement the present invention, a sliding rod is connected to the center of the transmission gear, the sliding rod is a crank slider mechanism, and one end of the sliding rod is slidably connected to the guide member.

[0010] Furthermore, in order to better implement the present invention, the volume of the high-pressure chilled water tank is selected according to the inlet pressure of the high-pressure chilled water, so that the high-pressure chilled water completes the first stage of buffer pressure relief when entering the water tank, and then completes the second stage of pressure relief by impacting the hydraulic fins.

[0011] Furthermore, in order to better realize the present invention, the low-pressure refrigeration return water boosting module is set up in multiple groups; the main gear is respectively engaged with multiple groups of transmission gears to simultaneously drive the pistons in multiple groups of boosting cylinders to reciprocate, thereby improving the boosting processing capacity of the return water side.

[0012] Furthermore, in order to better realize the present invention, the mine cooling chilled water high-low pressure conversion device supports series or parallel arrangement: when arranged in series, the low-pressure chilled water outlet pipe of the upstream device is connected to the high-pressure chilled water inlet pipe of the downstream device, and the chilled return water outlet pipe of the upstream device is connected to the chilled return water inlet pipe of the downstream device; when arranged in parallel, the high-pressure chilled water inlet pipes of multiple sets of devices are supplied in parallel through a water distributor.

[0013] Furthermore, in order to better implement the present invention, the opening direction of the check valve on the chilled return water inlet branch is from the chilled return water inlet pipe to the boosting cylinder, and the opening direction of the check valve on the chilled return water outlet branch is from the boosting cylinder to the chilled return water outlet pipe.

[0014] Further, in order to better realize the present application, the high-pressure chilled water tank, the main shaft, the water force fin, the transmission gear and the pressure cylinder are made of wear-resistant steel material, which is suitable for the high-humidity, high-pressure and low-temperature environment in the mine.

[0015] Further, in order to better realize the present application, the mine cooling chilled water high-low pressure conversion device does not contain electrical elements, and the pressure of the return water side is increased by mechanical transmission relying on the water force potential energy of the high-pressure chilled water, so as to reduce the explosion-proof requirement and operation risk in the mine.

[0016] The present application has the following beneficial effects: The potential energy of the high-pressure chilled water transported on the ground is converted into the potential energy of the chilled return water, not only the high-pressure chilled water is converted into the low-pressure chilled water suitable for the end air cooler, but also the chilled return water is pressurized, and the circulating water pump work is reduced. The low-pressure chilled water and the high-pressure chilled return water after pressure conversion can be continuously output, the pipeline pressure fluctuation is small, and the equipment is easy to manage. The equipment does not use electrical elements, and when used in the underground environment, the equipment does not need to be explosion-proof, and the safety performance is excellent. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is a structural schematic diagram of the mine cooling chilled water high-low pressure conversion device of the present application; Figure 2 The figure is an internal structure schematic diagram of the water tank of the mine cooling chilled water high-low pressure conversion device of the present application; Figure 3 The figure is a pressure cylinder sectional view of the mine cooling chilled water high-low pressure conversion device of the present application; Figure 4 The figure is a series arrangement diagram of the mine cooling chilled water high-low pressure conversion device of the present application; Figure 5 The figure is a parallel arrangement diagram of the mine cooling chilled water high-low pressure conversion device of the present application.

[0018] In the figure, 1-high-pressure chilled water tank, 2-water force fin, 3-high-pressure chilled water inlet pipe, 4-low-pressure chilled water outlet pipe, 5-chilled return water inlet pipe, 7-main shaft, 8-main gear, 9-transmission gear, 10-sliding rod, 11-guide piece, 12-piston, 13-pressure cylinder, 14-chilled return water outlet branch pipe, 15-chilled return water inlet branch pipe, 16-chilled return water outlet pipe, 17-check valve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0021] Figure 1-Figure 5This embodiment of the present invention is a high-low pressure conversion device for chilled water cooling in a mine, comprising a high-pressure chilled water pressure reducing module and a low-pressure chilled water return pressure boosting module. The high-pressure chilled water pressure reducing module comprises a high-pressure chilled water tank 1, hydraulic fins 2, a high-pressure chilled water inlet pipe 3, a low-pressure chilled water outlet pipe 4, a main shaft 7, and a main gear 8. One side of the high-pressure chilled water tank 1 is connected to the high-pressure chilled water inlet pipe 3 and the other side is connected to the low-pressure chilled water outlet pipe 4. The hydraulic fins 2 are positioned within the high-pressure chilled water tank 1 and connected at one end to the main shaft 7, which is connected to the main gear 8. Under the impact of high-pressure chilled water, the hydraulic fins 2 drive the main gear 8 to rotate via the main shaft 7. The low-pressure chilled water return pressure boosting module comprises a chilled water return inlet pipe 5, a chilled water return inlet branch pipe 15, a chilled water return outlet pipe 16, a chilled water return outlet branch pipe 14, a booster cylinder 13, a piston 12, a guide 11, a sliding rod 10, and a transmission gear 9. One end of the chilled return water inlet pipe 5 is connected to the downhole air cooler. One end of the chilled return water inlet branch pipe 15 is connected to the chilled return water inlet pipe 5, and the other end is connected to the boosting cylinder 13. A check valve 17 is installed on the chilled return water inlet branch pipe 15 to ensure that the chilled return water inlet direction is from the chilled return water inlet pipe 5 to the boosting cylinder 13; one end of the chilled return water outlet pipe 16 is connected to the ground refrigeration unit; the chilled return water outlet branch pipe 14 is connected to the boosting cylinder 13, and a check valve 17 is installed on the branch pipe to ensure that the chilled water outlet direction is from the boosting cylinder 13 to the chilled return water outlet pipe 16; the boosting cylinder 15 has a built-in piston 12, and under the drive of the transmission mechanism, the piston 12 reciprocates in the boosting cylinder; the transmission mechanism includes a guide member 11, a sliding rod 10, and a transmission gear 9; the guide member 11 is connected to the piston 12, and a guide groove is provided in the guide member; the sliding rod 10 passes through the guide member 11 and reciprocates up and down in the guide groove driven by the rotation of the transmission gear 9. The transmission gear 9 is connected to the sliding rod 10 and meshes with the main gear 8, rotating under the drive of the main gear 8. A bearing is installed at the connection between the high-pressure chilled water tank 1 and the main shaft 7 to reduce transmission resistance. The size of the high-pressure chilled water tank 1 can be adjusted according to the chilled water pressure. If the chilled water pressure is too high, a larger tank can be installed to release pressure first, then impact the hydraulic fins 2. Main gear 8 and transmission gear 9 are meshed and connected. With proper design, multiple low-pressure chilled water return booster modules can be deployed. The high-low pressure conversion device proposed in this invention can be arranged in multiple groups in parallel or series. In a series arrangement, the low-pressure chilled water outlet pipe 4 of the previous group is connected to the high-pressure chilled water inlet pipe 3 of the next group, and the high-pressure chilled water return outlet pipe 16 of the previous group is connected to the low-pressure chilled water return inlet pipe 5 of the next group. In a parallel arrangement, a water distributor is installed before the device, and the high-pressure chilled water inlet pipe 3 is connected to the distributor to achieve a parallel arrangement. The high-pressure chilled water tank 1, the main shaft 7, the hydraulic fins 2, the transmission mechanism, and the booster cylinder 13 in the device are all made of wear-resistant steel.

[0022] Workflow 1 of this embodiment: Chilled water produced by the surface refrigeration unit is transported through the chilled water inlet pipe to the high-low pressure conversion device located underground. It first enters the high-pressure chilled water tank, where its volume suddenly increases. The high-pressure chilled water undergoes a first decompression. The chilled water then impacts the hydraulic fins, causing them to rotate. The potential energy of the high-pressure chilled water is converted into kinetic energy, achieving a second decompression, transforming the water into low-pressure chilled water. The water then flows through the low-pressure chilled water outlet pipe into the terminal air cooler, cooling the tunnel air. The hydraulic fins rotate via the main shaft, driving the main gear. The transmission gear in the low-pressure chilled water return booster module meshes with the main gear, driving the main gear to initiate rotation. A sliding rod is connected to the transmission gear at one end and passes through a guide member at the other. Driven by the rotation of the transmission gear, the sliding rod reciprocates up and down within the guide member's guide slot, driving the guide member back and forth. The piston is rigidly connected to the guide member, which drives the piston back and forth within the booster cylinder.

[0023] In this embodiment, two positions are defined: a "first position" and a "second position." The first position is located away from the chilled return water outlet branch, while the second position is located closer to the chilled return water outlet branch. When the piston is in the first position, the pressure in the booster cylinder is less than that in the chilled return water inlet branch. When the piston is in the second position, the pressure in the booster cylinder is greater than that in the chilled return water inlet branch. As the piston moves from the second position toward the first position, chilled water, after heat exchange in the chilled return water inlet pipe, enters the booster cylinder through the branch. When the piston reaches the first position, the low-pressure chilled return water fills the booster cylinder. The piston, then propelled by the guide member, moves from the first position toward the second position, pushing the low-pressure chilled return water out of the booster cylinder through the chilled return water outlet branch. This push of the piston increases the potential energy of the chilled return water within the cylinder. Check valves are installed on both the chilled return water inlet branch and the chilled return water outlet branch to ensure water flow direction. When the piston moves from the second position to the first position, the fluid pressure in the booster cylinder is lower than that in the chilled return water inlet branch, allowing the chilled return water to flow into the booster cylinder. At the same time, the check valve prevents the chilled return water from entering the booster cylinder through the chilled return water outlet branch. As the piston moves from the first position to the second position, the pressure in the booster cylinder gradually increases. When it exceeds the pressure in the chilled return water inlet pipe, the low-pressure chilled return water stops flowing into the booster cylinder. At the same time, the check valve prevents the chilled return water from flowing back into the chilled return water inlet pipe and can only leave the booster cylinder through the chilled return water outlet branch. As the piston reciprocates within the booster cylinder, the fluid in the cylinder repeats this process.

[0024] Workflow 2 of this embodiment: The high-low pressure conversion device for cooling chilled water in a mine proposed by the present invention can be arranged in series or in parallel in multiple groups.

[0025] When the device is arranged in series, the inlet and outlet pipes of the chilled return water are blocked. When arranged in series, the unblocked end of the inlet pipe of the chilled return water of the first device is connected with the return pipe of the air cooler, the unblocked end of the outlet pipe of the chilled return water is connected with the unblocked end of the inlet pipe of the chilled return water of the second device, the unblocked end of the outlet pipe of the chilled return water of the second device is connected with the unblocked end of the inlet pipe of the chilled return water of the third device, and the connection mode of the subsequent devices is the same as the above mode. The series arrangement is suitable for the case that the high-pressure chilled water pressure is too high, and multiple devices can be used to continuously release the pressure of the high-pressure chilled water supply and increase the pressure of the chilled return water.

[0026] When the device is arranged in parallel, a high-pressure water distributor is configured, the inlet end of the high-pressure water distributor is connected with the outlet pipe of the high-pressure chilled water of the refrigeration system, and the multiple outlet ends of the high-pressure water distributor are connected with the high-pressure chilled water inlets of the multiple devices arranged through pipelines one by one; for the low-pressure sides of the multiple conversion devices arranged, a low-pressure chilled return water outlet main pipe and a low-pressure chilled return water inlet main pipe are arranged, wherein the low-pressure chilled return water outlet main pipe is connected with the low-pressure chilled water outlets of the devices through branch pipelines, and the low-pressure chilled return water inlet main pipe is connected with the low-pressure chilled water inlets of the conversion devices through branch pipelines, so as to realize the parallel and cooperative operation of the multiple conversion devices in the high and low pressure chilled water systems. The parallel arrangement is suitable for the case that the high-pressure chilled water supply is too large, and multiple devices can be used to simultaneously release the pressure of the high-pressure chilled water supply and increase the pressure of the chilled return water.

[0027] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application, and other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application as long as they do not deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A high-low pressure conversion device for cooling chilled water in a mine, comprising a high-pressure chilled water pressure reducing module and a low-pressure chilled water return pressure increasing module, characterized in that: The high-pressure chilled water pressure reducing module comprises a high-pressure chilled water tank (1), a hydraulic fin (2) arranged in the high-pressure chilled water tank (1), a high-pressure chilled water inlet pipe (3) connected to the chilled water outlet of the ground refrigeration unit, and a low-pressure chilled water outlet pipe (4) connected to the terminal air cooler; the hydraulic fin (2) is fixed to the main shaft (7), and the main shaft (7) is fixedly connected to the main gear (8); when the high-pressure chilled water enters the high-pressure chilled water tank (1) through the high-pressure chilled water inlet pipe (3) and impacts the hydraulic fin (2), the main shaft (7) and the main gear (8) are driven to rotate, thereby achieving pressure relief of the high-pressure chilled water and outputting low-pressure chilled water to the low-pressure chilled water outlet pipe (4); The chilled water return boosting module comprises a chilled water return inlet pipe (5) connected to the return water end of the downhole air cooler, an inlet branch connected to the boosting cylinder (13) via the chilled water return inlet branch pipe (15), an outlet branch connected to the chilled water return outlet pipe (16) via the chilled water return outlet branch pipe (14), a piston (12) arranged in the boosting cylinder (13), a guide member (11) and a sliding rod (10) linked to the piston (12), and a transmission gear (9) meshed with the main gear (8); wherein the transmission gear (9) is configured to move the main gear (8) The rotational motion is converted into the reciprocating motion of the sliding rod (10), and the sliding rod (10) reciprocates up and down in the guide groove of the guide member (11) to drive the piston (12) to reciprocate in the boosting cylinder (13), thereby pressurizing the chilled return water entering the boosting cylinder (13); a check valve (17) is respectively provided on the chilled return water inlet branch pipe (15) and the chilled return water outlet branch pipe (14) to limit the unidirectional flow direction of the fluid to the chilled return water inlet branch pipe (15) entering the boosting cylinder (13) and being discharged from the boosting cylinder (13) to the chilled return water outlet pipe (16).

2. The mine cooling chilled water high-low pressure conversion device according to claim 1 is characterized in that: The mating portion between the high-pressure freezing water tank (1) and the main shaft (7) is provided with a bearing assembly to reduce rotational resistance and improve sealing and wear resistance.

3. The mine cooling chilled water high-low pressure conversion device according to claim 1, characterized in that: The center of the transmission gear (9) is connected to a sliding rod (10), which is a crank slider mechanism. One end of the sliding rod (10) is slidably connected to the guide member (11).

4. The mine cooling chilled water high-low pressure conversion device according to claim 1, characterized in that: The volume of the high-pressure chilled water tank (1) is selected according to the inlet pressure of the high-pressure chilled water, so that the high-pressure chilled water completes the first stage of buffer pressure relief when entering the water tank, and then completes the second stage of pressure relief by impacting the hydraulic fins (2).

5. The mine cooling chilled water high-low pressure conversion device according to claim 1, characterized in that: The transmission gear (9), sliding rod (10), guide member (11), piston (12), boosting cylinder (13), chilled return water outlet branch (14), and chilled return water inlet branch (15) in the low-pressure chilled return water boosting module are arranged in multiple groups; the main gear (8) is respectively engaged with the multiple groups of transmission gears (9) to simultaneously drive the pistons (12) in the multiple groups of boosting cylinders (13) to reciprocate, thereby improving the boosting processing capacity of the return water side.

6. The mine cooling chilled water high-low pressure conversion device according to claim 1, characterized in that: The mine cooling chilled water high-low pressure conversion device supports series or parallel arrangement: when arranged in series, the low-pressure chilled water outlet pipe (4) of the upstream device is connected to the high-pressure chilled water inlet pipe (3) of the downstream device, and the chilled return water outlet pipe (16) of the upstream device is connected to the chilled return water inlet pipe (5) of the downstream device; when arranged in parallel, the outlet side of the water distributor is connected to the high-pressure chilled water inlet pipes (3) of multiple sets of devices, and high-pressure chilled water is supplied in parallel.

7. The mine cooling chilled water high-low pressure conversion device according to claim 1, characterized in that: The opening direction of the check valve (17) on the chilled return water inlet branch (15) is from the chilled return water inlet pipe (5) to the booster cylinder (13), and the opening direction of the check valve (17) on the chilled return water outlet branch (14) is from the booster cylinder (13) to the chilled return water outlet pipe (16).

8. The mine cooling chilled water high-low pressure conversion device according to claim 1, characterized in that: The high-pressure refrigerated water tank (1), main shaft (7), hydraulic fins (2), transmission gears (9), and booster cylinder (13) are made of wear-resistant steel and are suitable for use in underground high-humidity, high-pressure, and low-temperature environments.

9. The mine cooling chilled water high-low pressure conversion device according to claim 1, characterized in that: The mine cooling chilled water high-low pressure conversion device does not contain electrical components, fundamentally avoiding the risk of underground explosion caused by electrical sparks, and relies on mechanical transmission and volume expansion structure to complete the pressure relief of high-pressure chilled water; at the same time, during the pressure relief process, the mechanical transmission structure is used to directionally transfer the gravitational potential energy contained in the high-pressure chilled water to the low-pressure chilled return water side, thereby realizing energy recovery and utilization.

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