Safety device of propane heat pump system

Abstract

The invention provides a safety device of a propane heat pump system, and belongs to the technical field of heat pump systems. The problem that an existing heat pump system is insufficient in use safety when propane is adopted as a heat transfer working medium is solved. According to the safety device of the propane heat pump system, the propane heat pump system comprises a heat exchanger and a water tank, a water inlet pipe for conveying water from the heat exchanger to the water tank is connected between the heat exchanger and the water tank, and the safety device comprises a safety valve connected to the water inlet pipe and a microbubble exhaust valve connected in the water inlet pipe and used for collecting and exhausting propane gas in water. The safety valve and the microbubble exhaust valve are both installed outdoors. After the safety device is mounted on the propane heat pump system, the use safety of the propane heat pump system can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pump systems and relates to a safety device for a propane heat pump system. Background Art

[0002] A heat pump system is a device that absorbs heat from a low-temperature heat source and releases heat to a high-temperature heat source, and is an energy-efficient heating device. The heat pump system includes an evaporator, a compressor, a heat exchanger (condenser), a water tank, etc. The heat exchanger is connected to the evaporator and the compressor through an external circulation pipeline, and the heat exchanger is also connected to the water tank through an internal circulation pipeline. When the heat pump system operates, the evaporator absorbs heat from the air to evaporate the heat transfer medium into a gas. The gaseous heat transfer medium is compressed by the compressor, and its pressure and temperature increase. The high-temperature and high-pressure heat transfer medium exchanges heat with the low-temperature water medium in the heat exchanger. The heat transfer medium in the heat exchanger condenses into a liquid and is then transported back to the evaporator. The water in the heat exchanger is heated and then transported to the water tank.

[0003] The traditional heat transfer medium of heat pump systems is Freon. However, Freon can damage the ozone layer and has been gradually phased out. Currently, the heat transfer medium widely used to replace traditional Freon (chlorofluorocarbons) is R22 (dichlorofluoromethane). However, R22 is also a type of Freon and belongs to hydrochlorofluorocarbons, which is still harmful to the ozone layer and will be prohibited from use in the next few years. Therefore, it is very important to select an environmentally friendly and energy-saving refrigerant and develop a suitable heat pump system. Among them, R290 (propane) is very close to R22 in terms of basic physical properties such as standard boiling point, freezing point, critical point, etc., and has the basic conditions to replace R22. R290 is an important option to replace R22 as the heat transfer medium of heat pumps. However, when using R290 as the heat transfer medium in existing heat pump systems, its use safety still needs to be improved.

[0004] Under normal circumstances, the water medium and the heat transfer working medium in the heat exchanger are in an isolated state, and the heat transfer working medium will not mix into the water medium. However, heat exchangers are generally installed outdoors. In winter, especially in the north, the outdoor temperature is too low, which may cause fine cracks in the pipes inside the heat exchanger, allowing the gaseous heat transfer working medium to leak into the water medium. Since propane is an inflammable and explosive gas, propane is transported indoors through the flow of the water medium. When too much propane accumulates indoors, it is likely to cause safety hazards. In addition, in order to prevent the pressure in the pipeline from being too high, a safety valve for pressure relief is generally installed in the pipeline. However, the safety valve is in a closed state when the pipeline is under normal pressure, and the pipeline mostly operates under normal pressure. Therefore, simply installing a safety valve on the pipeline often cannot discharge the propane gas mixed in the water at any time, and it will still cause the propane gas to enter the water tank and accumulate indoors. Moreover, the conventional function of the safety valve in the water pipe is to drain water, not to exhaust gas. For this reason, propane heat pump systems usually need to coat the pipes inside the heat exchanger with an anti-freeze coating or thicken the pipes to prevent freezing. However, the use of the anti-freeze coating and thickening the pipes will both reduce the heat exchange efficiency of the heat exchanger, which is not conducive to the efficient use of the heat pump system. Summary of the Invention

[0005] The object of the present invention is to address the above problems existing in the prior art and propose a safety device for a propane heat pump system, which solves the technical problem of insufficient safety in the use of existing heat pump systems when propane is used as the heat transfer working medium.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] A safety device for a propane heat pump system, the propane heat pump system includes a heat exchanger and a water tank, and a water inlet pipe for conveying water from the heat exchanger to the water tank is connected between the heat exchanger and the water tank. The safety device is characterized in that it includes a safety valve connected to the water inlet pipe and a microbubble exhaust valve connected in the water inlet pipe for collecting and discharging propane gas in the water. Both the safety valve and the microbubble exhaust valve are installed outdoors.

[0008] If propane gas leaks into the water medium in the heat exchanger when the heat pump system is operating, since the solubility of propane gas in water is very low, it exists in the form of microbubbles in the water. When the water flows through the microbubble exhaust valve in the inlet pipe, the microbubble exhaust valve can adsorb and collect the propane gas in the water and discharge it. And the microbubble exhaust valve is set outdoors. After the propane is discharged into the atmosphere, it will be greatly diluted and there will be no danger. In this way, there will be no propane gas or only very little residual propane gas in the water entering the water tank, ensuring that no excessive propane gas will accumulate indoors and posing a safety hazard, thus improving the safety of using the propane heat pump system. Moreover, when the pressure in the inlet pipe increases or there is a large amount of propane gas causing the pressure to increase, the safety valve on the inlet pipe can timely discharge the excess water and gas outdoors. This can not only ensure that the pressure in the inlet pipe is within the safe range, but also discharge the excess propane gas, ensuring the safety of using the propane heat pump system. And because the safety valve and the microbubble exhaust valve are both installed on the inlet pipe, not only can the microbubble exhaust valve discharge the propane gas mixed in the water at any time when the inlet pipe is under normal pressure, but also when there is high pressure in the inlet pipe (especially the high pressure caused by a large amount of propane gas in the inlet pipe), while the safety valve timely discharges a large amount of propane gas, the microbubble exhaust valve also assists in discharging the propane gas mixed in the water part. The simultaneous use of the safety valve and the microbubble exhaust valve greatly improves the safety of use and gives play to the function of "1 + 1 > 2". Therefore, after installing this safety device on the propane heat pump system, the safety of using the propane heat pump system can be improved. And the safety valve and the microbubble exhaust valve are installed on the inlet pipe, which will not affect the heat exchange efficiency of the heat exchanger and ensure the efficient use of the propane heat pump system.

[0009] In the safety device of the above-mentioned propane heat pump system, the safety valve is located between the microbubble exhaust valve and the heat exchanger.

[0010] When the pressure in the inlet pipe is too high or there is a large amount of propane gas, the safety valve is first used to relieve the pressure and discharge the excess water and gas. In this way, when the water enters the microbubble exhaust valve downstream of the safety valve, the microbubble exhaust valve can normally adsorb, collect and discharge the remaining propane gas in the water, thus avoiding the situation that propane gas escapes from the microbubble exhaust valve into the water tank due to too high pressure in the inlet pipe, and improving the safety of use.

[0011] In the safety device of the above-mentioned propane heat pump system, an outlet pipe is also connected between the heat exchanger and the water tank, and the safety device further includes a check valve connected in the outlet pipe to make the water flow only from the water tank to the heat exchanger.

[0012] The installation of the one-way valve can prevent the water mixed with propane gas from flowing backward into the water tank through the outlet pipe, ensuring that all water passes through the microbubble exhaust valve to adsorb and discharge propane gas before entering the water tank, thus improving the safety of use.

[0013] In the safety device of the above propane heat pump system, there are several microbubble exhaust valves connected in series or / and in parallel with each other. This can adsorb, collect and discharge as much propane gas in the water as possible, ensuring that there will be no excessive propane gas in the room.

[0014] In the safety device of the above propane heat pump system, the microbubble exhaust valve includes a valve body and a microbubble adsorption net. The valve body is provided with a water inlet part having a water inlet channel, a water outlet part having a water outlet channel, and an exhaust part having an exhaust channel. The microbubble exhaust valve is connected to the water inlet pipe through the water inlet part and the water outlet part. The microbubble adsorption net is installed in the valve body and located between the water inlet part and the water outlet part. A valve core for controlling the opening and closing of the exhaust channel is also installed in the valve body.

[0015] The hot water flowing out from the heat exchanger flows into the valve body through the water inlet part, passes through the microbubble adsorption net in the valve body, then flows out from the water outlet part, and finally flows into the water tank. When the water passes through the microbubble adsorption net, by using the different surface tensions of propane gas in the microbubble state on the water surface and the solid surface, the propane gas in the microbubble state is retained and adsorbed on the microbubble adsorption net. When the microbubble propane gas accumulates on the microbubble adsorption net, they collide with each other to form large bubbles, and under the action of gas buoyancy, they rise and break away from the water surface and enter the upper part of the valve body. As the gas accumulates, the gas volume in the upper part of the valve body increases, and the valve core uses the increased gas volume to open the exhaust channel to discharge the propane gas into the outdoor atmosphere. In this way, through the adsorption and collection of propane gas in the water by the microbubble adsorption net and then being controlled by the valve core to be discharged into the atmosphere, it is avoided that propane gas enters the water tank and causes excessive propane in the room, thus improving the safety of use.

[0016] In the safety device of the above propane heat pump system, the microbubble adsorption net includes a cylindrical central cylinder made of a non-porous plate, an outer cylindrical net and an intermediate cylindrical net both made of a perforated net. The central cylinder is inserted into the outer cylindrical net and an intermediate channel is formed between the central cylinder and the outer cylindrical net. The intermediate cylindrical net is inserted into the intermediate channel, and there are several intermediate cylindrical nets arranged in sequence along the outer circumference of the central cylinder. The bottom of the outer cylindrical net is covered with a water control sealing plate, and water passing holes communicating the water outlet channel and the intermediate channel are opened on the water control sealing plate. The water inlet channel is located on the outer peripheral side of the outer cylindrical net, and the water passing holes are opposite to one side of the bottom of the intermediate channel and away from the water inlet channel.

[0017] When water enters the valve body through the water inlet channel and contacts the microbubble adsorption net, a part of the water enters the middle channel through the outer net cylinder. Since the side of the bottom of the middle channel close to the water inlet channel is blocked by the water control seal plate, and at the same time the central cylinder is made of a non-porous plate and also has a blocking effect on the water flow, the water will flow around the central cylinder in the middle channel and then flow out from the water passing holes far away from the water inlet channel. Another part of the water flow first flows outside the outer net cylinder and finally still enters the middle channel through the outer net cylinder and then flows out from the water passing holes. After the water leaves the microbubble adsorption net from the water passing holes, it then flows out from the water outlet channel. In this way, the propane gas in the water can contact more of the middle net cylinder and the outer net cylinder, so that the propane gas can be more fully adsorbed, aggregated and discharged in the microbubble adsorption net, reducing the possibility of propane gas escaping from the microbubble exhaust valve and improving the safety of the propane system.

[0018] In the safety device of the propane heat pump system described above, the microbubble adsorption net includes an outer net cylinder, a central net cylinder and a middle net cylinder that are all in a cylindrical shape made of a pore net. The central net cylinder is inserted into the outer net cylinder and a middle channel is formed between the central net cylinder and the outer net cylinder. The middle net cylinder is inserted into the middle channel, and there are several middle net cylinders arranged in sequence along the outer circumference of the central net cylinder. The bottom of the outer net cylinder is covered with a water control seal plate, and water passing holes communicating with the water outlet channel are opened on the water control seal plate. The water inlet channel is located on the outer peripheral side of the outer net cylinder, and the water passing holes are directly opposite to the inner hole of the central net cylinder.

[0019] When water enters the valve body through the water inlet channel and contacts the microbubble adsorption net, the water enters the middle channel through the outer net cylinder. Since the bottom of the middle channel is blocked by the water control seal plate, the water can only enter the inner hole of the central net cylinder after passing through the middle channel and then flow out from the water passing holes. After the water leaves the microbubble adsorption net from the water passing holes, it then flows out from the water outlet channel. In this way, the propane gas in the water can fully contact the outer net cylinder, the middle net cylinder and the central net cylinder, so that the propane gas can be more fully adsorbed, aggregated and discharged on the microbubble adsorption net, reducing the possibility of propane gas escaping from the microbubble exhaust valve and improving the safety of the propane system.

[0020] In the safety device of the propane heat pump system described above, the microbubble adsorption net further includes a spiral net cylinder formed by spirally winding a pore net, and the spiral net cylinder is inserted into each middle net cylinder.

[0021] The setting of the spiral mesh cylinder can not only provide more adsorption positions for propane gas, but also generate more disturbances and vortices when water passes through the spiral mesh cylinder, enabling small bubbles to hit and form large bubbles more quickly and break away from the water surface, so as to more fully adsorb, collect and discharge the propane gas in the water. At the same time, there are spiral channels and central channels between the cylinder walls of the spiral mesh cylinder, providing space for the rise of large bubbles and preventing the large bubbles from being cut into small bubbles due to overcrowding between the cylinder walls of the spiral mesh cylinder, which is conducive to the collection and discharge of gas and improves the safety of the propane system.

[0022] In the safety device of the above propane heat pump system, the bottom ends of the intermediate mesh cylinder and the spiral mesh cylinder both abut against the water control sealing plate, the side walls of two adjacent intermediate mesh cylinders abut against each other, and the side walls of the intermediate mesh cylinder also respectively abut against the central cylinder and the outer mesh cylinder.

[0023] Such a setting can, on the one hand, make the microbubble adsorption net structure more stable, thus ensuring the effectiveness of the long-term use of the microbubble exhaust valve, and on the other hand, provide more adsorption positions for propane gas, more fully adsorb, collect and discharge the propane gas in the water, and improve the safety of the propane system.

[0024] In the safety device of the above propane heat pump system, the outer edge of the water control sealing plate protrudes outward to the top of the outer mesh cylinder to form a fixing ring, and the fixing ring is located outside the outer mesh cylinder and abuts and fixes against the outer mesh cylinder. The setting of the fixing ring makes the outer mesh cylinder and the water control sealing plate fixed stably, ensuring the effectiveness of the long-term use of the microbubble exhaust valve.

[0025] In the safety device of the above propane heat pump system, there is a water passing gap between the bottom surface of the central cylinder and the water control sealing plate.

[0026] After water enters the intermediate channel, most of the water flows around the central cylinder, a small part of the water enters the central cylinder from the bottom of the central cylinder through the water passing gap, and another part of the water flows into the central cylinder from the top of the central cylinder. In this way, the water flows flowing in from the bottom and top of the central cylinder form a convection in the central cylinder, which is conducive to the impact and merger of propane bubbles in the water, and thus is also conducive to the discharge of propane gas.

[0027] In the safety device of the above propane heat pump system, there is a water passing annular gap between the outer side surface of the outer mesh cylinder and the wall surface of the inner cavity of the valve body. There is a positioning convex ring protruding towards the water passing annular gap on the wall surface of the inner cavity of the valve body, and the microbubble adsorption net is inserted into the positioning convex ring. The setting of the water passing annular gap enables the water flow to flow through the outer mesh cylinder and the intermediate mesh cylinder more fully, and utilizes the adsorption effect of the outer mesh cylinder and the intermediate mesh cylinder to adsorb propane gas. The positioning convex ring not only has a radial positioning effect on the microbubble adsorption net, but also has a blocking and vortex-forming effect on the water flowing in the water passing annular gap, which is also conducive to the adsorption, collection and discharge of propane gas.

[0028] In the safety device of the propane heat pump system described above, a positioning convex column is provided on one side of the bottom surface of the water control sealing plate opposite to the water through hole. The valve body has a positioning groove, and the positioning convex column is inserted into the positioning groove. The cooperation between the positioning convex column and the positioning groove circumferentially positions the microbubble adsorption net in the valve body, preventing the microbubble adsorption net from shaking during water passage and affecting the adsorption of propane gas, which is beneficial to ensuring the use safety of the propane heat pump system.

[0029] In the safety device of the propane heat pump system described above, the valve core includes a valve needle penetrating through the exhaust passage. A spring is connected to the valve needle, and the valve needle has a sealing portion. Under the action of the spring, the sealing portion abuts upward against the wall surface of the exhaust passage and seals. The lower end of the valve needle extends out of the exhaust passage and is connected to a lever. One end of the lever is hinged to the valve body, and the other end of the lever is connected to a hook. A floating block located above the microbubble adsorption net is fixed to the lower end of the hook.

[0030] After the microbubble exhaust valve is filled with water, water enters the inner cavity of the valve body and the water level exceeds the microbubble adsorption net. At this time, the floating block floats upward, and the floating block does not exert a force on the lever. The valve needle closes the exhaust passage under the action of the spring. When propane gas escapes from the water surface and enters above the microbubble adsorption net, the gas volume in the upper part of the valve body increases and the water level drops. In this way, the floating block drops, and the floating block pulls the lever to swing downward, thereby driving the valve needle to move downward to open the exhaust passage. Although the density of propane is greater than that of air, by using the pipeline in a pressurized state (greater than atmospheric pressure), propane can also be smoothly discharged into the atmosphere.

[0031] In the safety device of the propane heat pump system described above, a cover plate is fixed on the top wall of the valve body. An exhaust hole is provided on the cover plate. The exhaust passage includes the exhaust hole. A valve seat located below the exhaust hole is snap-fitted and fixed on the cover plate. The valve core includes a valve needle penetrating through the valve seat and a lever connected to the valve needle. A through slot is provided on the valve seat. One end of the lever passes through the slot and is hinged to the cover plate. The upper end of the valve needle passes through the lever and has a sealing portion. A spring is connected between the valve needle and the valve seat. Under the action of the spring, the sealing portion abuts upward against the wall surface of the exhaust hole and seals. The other end of the lever is connected to a hook. A floating block located above the adsorption filter net is fixed to the lower end of the hook.

[0032] After the microbubble exhaust valve is filled with water, water enters the inner cavity of the valve body and the water level exceeds the microbubble adsorption net. At this time, the floating block floats upward, and the floating block does not exert a force on the lever. The valve needle closes the exhaust hole under the action of the spring. When propane gas escapes from the water surface and enters above the microbubble adsorption net, the gas volume in the upper part of the valve body increases and the water level drops. In this way, the floating block drops, and the floating block pulls the lever to swing downward, thereby driving the valve needle to move downward to open the exhaust hole.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1. A safety valve and a microbubble exhaust valve are sequentially connected to the water inlet pipe, and both the safety valve and the microbubble exhaust valve are arranged outdoors. The propane gas in the water is discharged through the safety valve and the microbubble exhaust valve, avoiding the safety hazards caused by the excessive accumulation of propane gas indoors and improving the use safety.

[0035] 2. The structural setting of the microbubble adsorption net can more fully adsorb, collect and discharge the propane gas in the water in the microbubble exhaust valve, which is beneficial to improving the safety of the propane heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic structural diagram when the safety device is set in the propane heat pump system.

[0037] Figure 2 is a cross-sectional view of the microbubble exhaust valve in the first embodiment of the safety device.

[0038] Figure 3 is Figure 2 an enlarged schematic view of the simplified structure at A in

[0039] Figure 4 is Figure 2 a top view of the microbubble adsorption net in

[0040] Figure 5 is Figure 2 a bottom view of the microbubble adsorption net in

[0041] Figure 6 is Figure 2 a three-dimensional view of the microbubble adsorption net with the middle cylinder and the spiral cylinder hidden.

[0042] Figure 7 is Figure 2 a disassembled three-dimensional view of the middle cylinder and the spiral cylinder in the microbubble adsorption net.

[0043] Figure 8 is Figure 2 a partial enlarged view of B in

[0044] Figure 9 is a top view of the microbubble adsorption net in the second embodiment of the safety device.

[0045] Figure 10 is Figure 9 a three-dimensional view of the outer cylinder in the microbubble adsorption net.

[0046] Figure 11 is Figure 9 a disassembled three-dimensional view of the middle cylinder and the central cylinder in the microbubble adsorption net.

[0047] Figure 12 This is a cross-sectional view of the microbubble exhaust valve in the fourth embodiment of the present safety device.

[0048] Figure 13 is Figure 12 A partial enlarged view of the upper part.

[0049] Figure 14 This is a three-dimensional view of the valve core of the microbubble exhaust valve in the fourth embodiment.

[0050] In the figure, 1, heat exchanger; 2, water tank; 3, water inlet pipe; 4, water outlet pipe; 5, check valve; 6, water tank safety valve; 7, water tank exhaust valve; 8, expansion tank; 9, pressure gauge; 10, globe valve; 11, water pump; 12, flowmeter; 13, filter ball valve; 14, safety valve; 15, microbubble exhaust valve; 16, valve body; 16a, water inlet part; 16a1, water inlet channel; 16b, water outlet part; 16b1, water outlet channel; 16c, exhaust part; 16c1, exhaust channel; 16c2, step; 16d, water passing annular gap; 16e, positioning convex ring; 16f, concave surface; 16g, positioning groove; 16h, valve cover; 16h1, exhaust outer channel; 17, valve core; 17a, valve needle; 17a1, sealing part; 17a2, retaining ring; 17b, spring; 17c, lever; 17c1, sliding hole; 17c2, hinge shaft; 17d, hook; 17e, floating block; 18, partition board; 18a, guide rod; 19, microbubble adsorption net; 19a, central cylinder; 19b, outer net cylinder; 19c, intermediate net cylinder; 19d, spiral net cylinder; 19e, water control sealing plate; 19e1, water passing hole; 19e2, fixing ring; 19f, intermediate channel; 19g, water passing gap; 19h, positioning convex column; 19k, central net cylinder; 20, sealing ring; 21, cover plate; 21a, exhaust hole; 21b, clamping foot; 21b1, buckling part; 21c, hinge ear; 21c1, hinge hole; 21c2, notch; 21d, strengthening part; 22, valve seat; 22a, slot; 22c, positioning groove; 22e, avoidance groove; 22f, installation groove; 22g, guide hole. Detailed implementation manners

[0051] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0052] Embodiment 1

[0053] Such as Figure 1 and Figure 2As shown in the figure, a safety device for a propane heat pump system. The propane heat pump system includes a heat exchanger 1 and a water tank 2. The heat exchanger 1 is installed outdoors, and the water tank 2 is installed indoors. A water inlet pipe 3 for conveying water from the heat exchanger 1 to the water tank 2 and a water outlet pipe 4 for conveying water from the water tank 2 to the heat exchanger 1 are connected between the heat exchanger 1 and the water tank 2. The safety device includes a safety valve 14 connected to the water inlet pipe 3 and a microbubble exhaust valve 15 connected in the water inlet pipe 3 for collecting and discharging propane gas in the water. Both the safety valve 14 and the microbubble exhaust valve 15 are installed outdoors, and the safety valve 14 is located between the microbubble exhaust valve 15 and the heat exchanger 1. The safety device also includes a check valve 5 connected in the water outlet pipe 4 to allow water to flow only from the water tank 2 to the heat exchanger 1. The check valve 5 is installed outdoors. A safety pipe is installed at the top of the water tank 2, and a water tank safety valve 6, a water tank exhaust valve 7 and an expansion tank 8 are installed on the safety pipe. A pressure gauge 9 is also provided on the connecting pipe of the expansion tank 8 and the safety pipe. These components are used to ensure the safety of the water tank 2 during indoor use. A stop valve 10 is also connected downstream of the microbubble exhaust valve 15 in the water inlet pipe 3. The stop valve 10 is located indoors to facilitate the control of the water inlet. A water pump 11, a flow meter 12 and a filter ball valve 13 are successively connected in the water outlet pipe 4. The water pump 11 provides power for the water circulation of the heat pump system to facilitate the water circulation of the heat pump system. The flow meter 12 is provided to allow the user to understand the flow rate of the water circulation of the heat pump system. The filter ball valve 13 can not only filter impurities in the water, but also control the flow rate of the water circulation of the heat pump system.

[0054] As Figure 1 and Figure 2 shown in the figure, the water inlet pipe 3 includes a first branch pipe and a second branch pipe. The safety valve 14 is installed on the first branch pipe, and the microbubble exhaust valve 15 is installed between the first branch pipe and the second branch pipe. The microbubble exhaust valve 15 includes a valve body 16 and a microbubble adsorption net 19. The valve body 16 has a water inlet part 16a, a water outlet part 16b and an exhaust part 16c. The two ends of the first branch pipe are respectively connected to the heat exchanger 1 and the water inlet part 16a. The two ends of the second branch pipe are respectively connected to the water outlet part 16b and the water tank 2. The water inlet part 16a is provided with a water inlet channel 16a1 communicating with the inner cavity of the valve body 16. The water outlet part 16b is provided with a water outlet channel 16b1 communicating with the inner cavity of the valve body 16. The exhaust part 16c is provided with an exhaust channel 16c1 communicating with the inner cavity of the valve body 16. The microbubble adsorption net 19 is installed in the inner cavity of the valve body 16 and is located between the water inlet channel 16a1 and the water outlet channel 16b1. A valve core 17 capable of opening and closing the exhaust channel 16c1 by using the volume change of the gas in the inner cavity of the valve body 16 is also installed in the valve body 16.

[0055] The water inlet part 16a is arranged on the outer side surface of the valve body 16, the water outlet part 16b is arranged on the bottom of the valve body 16, and the exhaust part 16c is arranged on the top of the valve body 16. A partition plate 18 is fixed inside the valve body 16. The partition plate 18 divides the inner cavity of the valve body 16 into an upper cavity and a lower cavity, and a through hole is formed on the partition plate 18. The valve body 17 includes a main body and a valve cover 16h fixed on the top of the main body. An exhaust passage 16c1 is arranged on the valve cover 16h. As Figure 8 shown, the valve core 17 includes a valve needle 17a penetrating through the exhaust passage 16c1. The upper end of the valve needle 17a is connected with a spring 17b. A step 16c2 is provided on the wall surface of the exhaust passage 16c1. The upper end of the spring 17b abuts against the upper end of the valve needle 17a, and the lower end of the spring 17b abuts against the step 16c2. The lower end of the valve needle 17a has a sealing part 17a1, and the sealing part 17a1 is conical. Under the action of the spring 17b, the sealing part 17a1 abuts against the wall surface at the lower end of the water outlet passage 16b1 and seals. In order to improve the sealing performance, a sealing ring 20 is fixed on the wall surface at the lower end of the water outlet passage 16b1, and the sealing part 17a1 abuts against the sealing ring 20 to form a seal. The lower end of the valve needle 17a extends out of the exhaust passage 16c1 and is connected with a lever 17c. The lever 17c is located below the sealing part 17a1. One end of the lever 17c is hinged on the top wall of the valve body 16 (i.e., the valve cover 16h), and the other end of the lever 17c is connected with a hook 17d. A floating block 17e is fixed at the lower end of the hook 17d. The connection position of the valve needle 17a and the lever 17c is close to one end of the lever 17c hinged with the valve body 16. A guide rod 18a is fixed on the partition plate 18, and the floating block 17e is sleeved on the guide rod 18a and can float up and down along the guide rod 18a. After the microbubble exhaust valve 15 is filled with water, when the water enters the upper cavity, the floating block 17e floats up. When the floating block 17e floats up, the floating block 17e does not exert a force on the lever 17c, and the valve needle 17a closes the exhaust passage 16c1 under the action of the spring 17b. When the propane gas detaches from the water surface and enters the upper cavity, increasing the gas volume in the upper cavity, the water level drops. In this way, the floating block 17e drops, and the floating block 17e pulls the lever 17c to swing downward, thereby driving the valve needle 17a to move downward to open the exhaust passage 16c1. When the propane gas is discharged through the exhaust passage 16c1, the gas volume in the upper cavity of the valve body 16 becomes smaller, and the water level rises. In this way, the floating block 17e rises, and the floating block 17e no longer exerts a force on the lever 17c. Under the action of the spring 17b, the valve needle 17a moves upward so that the sealing part 17a1 re-closes the exhaust passage 16c1. Although the density of propane is greater than that of air, by using the pipeline in a pressurized state (greater than atmospheric pressure), the propane can also be smoothly discharged into the atmosphere.

[0056] The microbubble adsorption net 19 is installed in the lower cavity. The water inlet channel 16a1 is located on the outer peripheral side of the microbubble adsorption net 19, and the water outlet channel 16b1 is located below the microbubble adsorption net 19. The water outlet channel 16b1 is perpendicular to the water inlet channel 16a1 and coaxial with the lower cavity. There is a water passing annular gap 16d between the outer side surface of the microbubble adsorption net 19 and the cavity wall surface of the lower cavity. There is a positioning convex ring 16e protruding towards the water passing annular gap 16d on the cavity wall surface of the lower cavity, and the microbubble adsorption net 19 is inserted into the positioning convex ring 16e. There are two positioning convex rings 16e, which are respectively arranged above and below the water inlet channel 16a1, and the microbubble adsorption net 19 is radially positioned in the lower cavity through the positioning convex ring 16e. The bottom surface of the lower cavity is a concave surface 16f. The outer edge of the bottom of the microbubble adsorption net 19 abuts against the concave surface 16f. The concave surface 16f and the partition 18 are used to axially limit the microbubble adsorption net 19 in the lower cavity. At the same time, the setting of the concave surface 16f enables there to be a space between the microbubble adsorption net 19 and the bottom surface of the lower cavity for water to flow smoothly into the water outlet channel 16b1. There are positioning convex columns 19h arranged on the bottom surface of the microbubble adsorption net 19, and there are positioning grooves 16g on the concave surface 16f. The positioning convex columns 19h are inserted into the positioning grooves 16g to circumferentially position the microbubble adsorption net 19 in the lower cavity.

[0057] Such as Figures 3 - 7As shown, the microbubble adsorption net 19 includes a cylindrical central cylinder 19a made of a non-porous plate, an outer net cylinder 19b and an intermediate net cylinder 19c both made of a perforated net and in a cylindrical shape. The central cylinder 19a is inserted into the outer net cylinder 19b and arranged coaxially, and an intermediate channel 19f is formed between the central cylinder 19a and the outer net cylinder 19b. The intermediate net cylinder 19c is inserted into the intermediate channel 19f, and there are several intermediate net cylinders 19c arranged in sequence along the outer periphery of the central cylinder 19a. There are 6 intermediate net cylinders 19c shown in the figure, and the number of intermediate net cylinders 19c can be appropriately increased or decreased. The bottom of the outer net cylinder 19b is covered with a water control sealing plate 19e, and a water passing hole 19e1 communicating the water outlet channel 16b1 and the intermediate channel 19f is opened on the water control sealing plate 19e. The water inlet channel 16a1 is located on the outer peripheral side of the outer net cylinder 19b, and the water passing hole 19e1 is opposite to one side of the bottom of the intermediate channel 19f and away from the water inlet channel 16a1. The microbubble adsorption net 19 further includes a spiral net cylinder 19d formed by helically winding a perforated net, and a spiral net cylinder 19d is inserted into each intermediate net cylinder 19c. A spiral channel is formed between the cylinder walls of each spiral net cylinder 19d, and a central channel is provided at the center of the spiral net cylinder 19d. There is a water passing gap 19g between the bottom surface of the central cylinder 19a and the water control sealing plate 19e. The bottom ends of the intermediate net cylinder 19c and the spiral net cylinder 19d are both abutted against the water control sealing plate 19e. The side walls of two adjacent intermediate net cylinders 19c are abutted against each other, and the side walls of the intermediate net cylinder 19c are also respectively abutted against the central cylinder 19a and the outer net cylinder 19b. The side wall of the central cylinder 19a is fixed to the side wall of the intermediate net cylinder 19c. The outer edge of the water control sealing plate 19e protrudes outward from the top of the outer net cylinder 19b to form a fixing ring 19e2, and the fixing ring 19e2 is located outside the outer net cylinder 19b and is abutted and fixed to the outer net cylinder 19b. The outer edge of the water control sealing plate 19e is abutted against the concave surface 16f, and a positioning convex column 19h is provided on the bottom surface of the water control sealing plate 19e and on the side opposite to the water passing hole 19e1.

[0058] As Figure 6 and Figure 7 shown, the pore sizes and the structural dimensions of the pores of the outer net cylinder 19b, the intermediate net cylinder 19c and the spiral net cylinder 19d are all different. Among them, the pores of the outer net cylinder 19b are rhombus-shaped and close to square, with the largest pore size and the thinnest side bars forming the pores; the pores of the spiral net cylinder 19d are also rhombus-shaped and close to square, and the pore size of the spiral net cylinder 19d is slightly smaller than that of the outer net cylinder 19b, with the thickest side bars forming the pores; the pores of the intermediate net cylinder 19c are rhombus-shaped, and the acute angle of the pores is approximately 45°, and the thickness of the side bars forming the pores is between that of the spiral net cylinder 19d and the outer net cylinder 19b. Such an arrangement can enable the propane gas in the water to be more fully adsorbed on the microbubble adsorption net 19, which is beneficial to better collecting the propane gas in the water and discharging it.

[0059] When water flows through the microbubble exhaust valve 15 in the water inlet pipe 3, the microbubble exhaust valve 15 can adsorb and collect the propane gas in the water through the microbubble adsorption net 19, and then discharge it through the exhaust passage 16c1 controlled by the valve core 17. The microbubble exhaust valve 15 is arranged outdoors. After the propane is discharged into the atmosphere, it will be greatly diluted and there will be no danger. In this way, the water entering the water tank 2 will have no propane gas or only a very small amount of propane gas remaining, ensuring that no excessive propane gas will accumulate indoors and posing a safety hazard, thus improving the safety of using the propane heat pump system. Moreover, when the pressure in the water inlet pipe 3 increases or there is more propane gas, the safety valve 14 on the water inlet pipe 3 can timely discharge the excess water and gas outdoors. This can not only ensure that the pressure in the water inlet pipe 3 is within the safe range, but also discharge the excess propane gas. At the same time, it can also avoid the situation where propane gas escapes from the microbubble exhaust valve 15 into the water tank 2 due to too high pressure in the water inlet pipe 3, further improving the safety of using the propane heat pump system. Therefore, after installing this safety device on the propane heat pump system, the safety of using the propane heat pump system can be improved. Moreover, the safety valve 14 and the microbubble exhaust valve 15 are installed on the water inlet pipe 3, which will not affect the heat exchange efficiency of the heat exchanger 1, ensuring the efficient use of the propane heat pump system, being economical and practical.

[0060] Embodiment 2

[0061] As Figures 9 - 11As shown, the structure of the microbubble adsorption net 19 is different from that of the first embodiment, and other structures are the same as those of the first embodiment. The microbubble adsorption net 19 includes an outer net cylinder 19b, a central net cylinder 19k, and an intermediate net cylinder 19c, all of which are in a cylindrical shape made of a pore net. The central net cylinder 19k is inserted into the outer net cylinder 19b, and an intermediate channel 19f is formed between the central net cylinder 19k and the outer net cylinder 19b. The central net cylinder 19k and the outer net cylinder 19b are coaxially arranged. The intermediate net cylinder 19c is inserted into the intermediate channel 19f, and there are several intermediate net cylinders 19c arranged in sequence along the outer circumference of the central net cylinder 19c. In the figure, there are six intermediate net cylinders 19c shown and they are evenly arranged circumferentially. The number of intermediate net cylinders 19c can also be appropriately increased or decreased. The bottom of the outer net cylinder 19b is covered with a water control sealing plate 19e, and the water control sealing plate 19e closes the bottom of the intermediate channel 19f. A water passing hole 19e1 communicating with the water outlet channel 16b1 is formed on the water control sealing plate 19e, and the water passing hole 19e1 is directly opposite to the inner hole of the central net cylinder 19k. The water inlet channel 16a1 is located on the outer peripheral side of the outer net cylinder 19b. The bottom ends of the intermediate net cylinder 19c and the central net cylinder 19k both abut against the water control sealing plate 19e. The side walls of two adjacent intermediate net cylinders 19c abut against each other, and the side walls of the intermediate net cylinder 19c also respectively abut against the central net cylinder 19k and the outer net cylinder 19b. The side wall of the central net cylinder 19k is fixed to the side wall of the intermediate net cylinder 19c, and the side wall of the outer net cylinder 19b is fixed to the side wall of the intermediate net cylinder 19c. The outer edge of the water control sealing plate 19e protrudes outward to the top of the outer net cylinder 19b to form a fixing ring 19e2, and the fixing ring 19e2 is located outside the outer net cylinder 19b and is fixedly attached to the outer net cylinder 19b. In addition, as Figure 9 and Figure 11 shown, the structures of the central net cylinder 19k and the intermediate net cylinder 19c are the same.

[0062] Embodiment Three

[0063] The microbubble adsorption net 19 includes a central net cylinder 19k and an intermediate net cylinder 19c, both of which are in a cylindrical shape made of a pore net. There are several intermediate net cylinders 19c arranged evenly around the central net cylinder 19k. The side walls of the intermediate net cylinder 19c abut against and are fixed to the side walls of the central net cylinder 19c. The side walls of two adjacent intermediate net cylinders 19c abut against and are fixed to each other (that is, the outer net cylinder 19b and the water control sealing plate 19e in the microbubble adsorption net structure of the second embodiment are omitted). Other structures are the same as those of the first embodiment.

[0064] Embodiment Four

[0065] As Figures 12 - 14As shown in the figure, there is another microbubble exhaust valve 15 suitable for the safety device of the propane heat pump system. The microbubble exhaust valve 15 includes a valve body 16 and a microbubble adsorption net 19. The structure of the microbubble adsorption net 19 is the same as that in the third embodiment, and it can also be replaced with the structure of the microbubble adsorption net 19 in the first embodiment or the second embodiment. The structure of the valve body 16 is roughly the same as that in the first embodiment, and the main difference lies in the valve core 17 and the matching structure between the valve core 17 and the valve body 16.

[0066] The valve core 17 includes a valve needle 17a, a lever 17c, a floating block 17e, a spring 17b and a hook 17d. The floating block 17e is fixedly separated or integrally connected with the hook 17d. A cover plate 21 is clamped and fixed between the main body and the valve cover 16h. An exhaust outer channel 16h1 is provided at the center of the valve cover 16h. The cover plate 21 is in a disc shape, and the outer edge of the cover plate 21 is clamped between the upper end surface of the main body and the lower end surface of the valve cover 16h. The outer edge of the lower end surface of the valve cover 16h has a downwardly protruding connecting cylinder, and the connecting cylinder is sleeved outside the upper end of the main body and forms a threaded connection. A sealing washer is fixed on the outer edge of the cover plate 21, and the sealing washer abuts against the upper end surface of the main body to form a seal. An exhaust hole 21a for cooperating with the valve needle 17a is provided on the cover plate 21. A diversion channel is provided on the upper surface of the cover plate 21. The exhaust hole 21a is communicated with the exhaust outer channel 16h1 through a feeding channel. The exhaust hole 21a, the diversion channel and the exhaust outer channel 16h1 form an exhaust channel. A valve seat 22 is fixedly separated on the cover plate 21, and the valve seat 22 is fixed on the lower surface of the cover plate 21 and is located below the exhaust hole 21a. A through slot 22a is provided on the outer side surface of the valve seat 22, and the upper side part of the slot 22a also penetrates upward through the upper end surface of the valve seat 22. The head end of the lever 17c passes through the slot 22a and is hinged to the cover plate 21. The upper end of the valve needle 17a passes through the lever 17c and is inserted into the exhaust hole 21a. The upper end of the hook 17d is hooked to the tail end of the lever 17c.

[0067] On the lower surface of the cover plate 21, clamping feet 21b and hinge ears 21c are convexly provided on both sides of the exhaust hole 21a. The clamping feet 21b and the hinge ears 21c are integrally formed with the cover plate 21. The clamping feet 21b and the hinge ears 21c have a certain rigidity and elastic deformation ability, and the cover plate 21 is generally made of plastic. The two clamping feet 21b are symmetrically arranged, and the two hinge ears 21c are symmetrically arranged. There is an integrally connected reinforcing portion 21d between the upper end of the hinge ear 21c and the clamping foot 21b on the same side as the exhaust hole 21a, and there is a gap between the lower end of the hinge ear 21c and the clamping foot 21b on the same side as the exhaust hole 21a. The valve seat 22 is embedded between the two clamping feet 21b and is clamped and fixed. The valve seat 22 is in the shape of a cuboid and has a symmetrical structure. On the side surface of the valve seat 22 opposite to the clamping foot 21b, there is a step, and the step surface of the step is arranged downward. On the side surface of the valve seat 22 opposite to the clamping foot 21b, there is a buckle portion, and the clamping foot 21b has a corresponding mating portion 21b1 with respect to the buckle portion. The mating portion 21b1 is located below the buckle portion and abuts against the buckle portion. The upper end surface of the valve seat 22 abuts against the lower surface of the cover plate 21, and the upper end surface of the buckle portion is inclined downward. On the side surface of the valve seat 22 opposite to the clamping foot 21b, there is also a positioning groove 22c. The upper side portion of the positioning groove 22c penetrates the upper end surface of the valve seat 22, and the clamping foot 21b is embedded in the positioning groove 22c. The buckle portion is arranged at the lower side portion of the positioning groove 22c. The two opposite side surfaces of the clamping foot 21b are the inner side surfaces of the clamping foot 21b, and the width of the clamping foot 21b is the distance between the two side surfaces of the clamping foot 21b opposite to the two side surfaces of the positioning groove 22c. There is a card slot above the mating portion 21b1 on the inner side surface of the clamping foot 21b, and the buckle portion is located in the card slot. There are also positioning holes opened on the lower surface of the cover plate 21, and there are protruding positioning posts on the upper end surface of the valve seat 22. The positioning posts are embedded in the positioning holes. There are several positioning holes and they are arranged around the exhaust hole 21a. There are several positioning posts and they correspond to the positioning holes one by one. The upper end of the positioning post is in a conical shape, which is convenient for inserting the positioning post into the positioning hole. The number of positioning holes is generally set to two, three or four.

[0068] A sliding hole 17c1 is formed in the head end of the lever 17c. The sliding hole 17c1 extends along the length direction of the lever 17c to form a strip-shaped hole, and the upper end of the valve core 17 passes through the sliding hole 17c1. A hinge hole 21c1 is formed in the hinge ear 21c. Hinge shafts 17c2 corresponding to the hinge hole 21c1 are respectively provided on both sides of the head end of the lever 17c. The hinge shafts 17c2 are rotatably inserted into the hinge hole 21c1. A notch 21c2 is formed in the side surface of the hinge ear 21c facing away from the clamping foot 21b. The notch 21c2 extends towards the hinge hole 21c1 and penetrates the wall surface of the hinge hole 21c1. The hinge shaft 17c2 can be embedded into the hinge hole 21c1 from the notch 21c2. The width of the notch 21c2 is the distance between the upper side surface and the lower side surface of the notch 21c2. The upper side surface of the notch 21c2 slopes upwards, and the lower side surface of the notch 21c2 slopes downwards, so that the entrance width of the notch 21c2 is the largest, facilitating the hinge shaft 17c2 to be embedded into the hinge hole 21c1 through the notch 21c2. An avoidance groove 22e is formed in the side surface of the valve seat 22 facing the hinge shaft 17c2. A part of the entity of the hinge shaft 17c2 is located in the avoidance groove 22e.

[0069] A retaining ring 17a2 is provided on the outer side surface of the valve needle 17a. The retaining ring 17a2 is located below the lever 17c and abuts against the lever 17c. The upper end of the spring 17b abuts against the lower end surface of the retaining ring 17a2. An installation groove 22f is formed in the lower side surface of the slot 22a. A through guiding hole 22g is formed in the bottom surface of the installation groove 22f. The lower end of the valve needle 17a passes through the installation groove 22f and then penetrates into the guiding hole 22g. The spring 17b is installed in the installation groove 22f and the lower end of the spring 17b abuts against the bottom surface of the installation groove 22f. A sealing ring 20 is fixed at the lower port of the exhaust hole 21a. The upper end of the valve needle 17a has a conical sealing portion 17a1. The sealing portion 17a1 abuts against the sealing ring 20 to form a seal.

[0070] After the microbubble exhaust valve is filled with water, the water enters the inner cavity of the valve body and the water level exceeds the adsorption filter screen. At this time, the floating block 17e floats up, and the floating block 17e does not apply a force to the lever 17c. The valve needle 17a closes the exhaust hole 21a under the action of the spring 17b. When the propane gas breaks away from the water surface and enters above the adsorption filter screen, the gas volume in the upper part of the valve body increases and the water level drops. In this way, the floating block 17e drops, and the floating block 17e pulls the lever 17c to swing downwards, thereby driving the valve needle 17a to move downwards to open the exhaust hole 21a. When the propane gas is discharged through the exhaust channel, the gas volume in the upper cavity of the valve body becomes smaller and the water level rises. In this way, the floating block 17e rises, and the floating block 17e no longer applies a force to the lever 17c. Under the action of the spring 17b, the valve needle 17a moves upwards so that the sealing portion 17a1 re-closes the exhaust hole 21a.

[0071] Example Five

[0072] In order to discharge as much propane gas in water as possible, several microbubble exhaust valves 15 are provided in the water inlet pipe 3. The several microbubble exhaust valves 15 are connected in series in the water inlet pipe 3 in sequence, or the several microbubble exhaust valves 15 are connected in parallel between the first branch pipe and the second branch pipe of the water inlet pipe 3, or the several microbubble exhaust valves 15 are connected in a series-parallel hybrid manner and then connected between the first branch pipe and the second branch pipe of the water inlet pipe 3. For example, when three microbubble exhaust valves 15 are provided, these three microbubble exhaust valves 15 can be connected in series to the water inlet pipe 3; these three microbubble exhaust valves 15 can also be connected in parallel between the first branch pipe and the second branch pipe of the water inlet pipe 3; or two microbubble exhaust valves 15 are connected in series and then connected in parallel with another microbubble exhaust valve 15, and then connected between the first branch pipe and the second branch pipe of the water inlet pipe 3; or two microbubble exhaust valves 15 are connected in parallel and then connected in series with another microbubble exhaust valve 15, and then connected between the first branch pipe and the second branch pipe of the water inlet pipe 3. Other structures are the same as those in the first embodiment.

[0073] Embodiment Six

[0074] The spiral mesh cylinder 19d is cancelled in the microbubble adsorption net 19, and other structures are the same as those in the first embodiment.

[0075] Embodiment Seven

[0076] The installation position of the spring 17b of the valve core 17 is different from that in the first embodiment, and other structures are the same as those in the first embodiment. A valve seat is provided on the valve body 16 below the lever 17c. The upper end of the spring 17b abuts against the lower end of the valve needle 17a, and the lower end of the spring 17b abuts against the valve seat.

[0077] Embodiment Eight

[0078] The water inlet part 16a and the water outlet part 16b on the valve body 16 are respectively located on both sides of the microbubble adsorption net 19. Other structures are the same as those in the first embodiment.

[0079] Embodiment Nine

[0080] The safety valve 14 is installed downstream of the microbubble exhaust valve 15, that is, the microbubble exhaust valve 15 is between the heat exchanger 1 and the safety valve 14. Other structures are the same as those in the first embodiment.

[0081] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A safety device for a propane heat pump system, the propane heat pump system comprising a heat exchanger (1) and a water tank (2), a water inlet pipe (3) for conveying water from the heat exchanger (1) to the water tank (2) is connected between the heat exchanger (1) and the water tank (2), characterized in that, The safety device includes a safety valve (14) connected to the water inlet pipe (3) and a microbubble exhaust valve (15) connected in the water inlet pipe (3) for collecting and discharging propane gas in the water. Both the safety valve (14) and the microbubble exhaust valve (15) are installed outdoors.

2. The safety device of the propane heat pump system according to claim 1, characterized in that, The safety valve (14) is located between the microbubble exhaust valve (15) and the heat exchanger (1).

3. The safety device of the propane heat pump system according to claim 1, characterized in that, An outlet pipe (4) is also connected between the heat exchanger (1) and the water tank (2). The safety device further includes a check valve (5) connected in the outlet pipe (4) to allow water to flow only from the water tank (2) to the heat exchanger (1).

4. The safety device of the propane heat pump system according to claim 1, characterized in that, There are several microbubble exhaust valves (15) connected in series and / or in parallel.

5. The safety device of the propane heat pump system according to any one of claims 1-4, characterized in that, The microbubble exhaust valve (15) includes a valve body (16) and a microbubble adsorption net (19). The valve body (16) is provided with a water inlet part (16a) having a water inlet channel (16a1), a water outlet part (16b) having a water outlet channel (16b1), and an exhaust part (16c) having an exhaust channel (16c1). The microbubble exhaust valve (15) is connected to the water inlet pipe (3) through the water inlet part (16a) and the water outlet part (16b). The microbubble adsorption net (19) is installed inside the valve body (16) and located between the water inlet part (16a) and the water outlet part (16b). A valve core (17) for controlling the opening and closing of the exhaust channel (16c1) is also installed inside the valve body (16).

6. The safety device of the propane heat pump system according to claim 5, characterized in that, The microbubble adsorption net (19) includes a cylindrical central cylinder (19a) made of a non-porous plate, and an outer cylindrical net (19b) and an intermediate cylindrical net (19c) both made of a perforated net. The central cylinder (19a) is inserted into the outer cylindrical net (19b) to form an intermediate channel (19f) between the central cylinder (19a) and the outer cylindrical net (19b). The intermediate cylindrical net (19c) is inserted into the intermediate channel (19f), and there are several intermediate cylindrical nets (19c) arranged in sequence along the outer circumference of the central cylinder (19a). The bottom of the outer cylindrical net (19b) is covered with a water control sealing plate (19e). A water passing hole (19e1) communicating the water outlet channel (16b1) and the intermediate channel (19f) is opened on the water control sealing plate (19e). The water inlet channel (16a1) is located on the outer peripheral side of the outer cylindrical net (19b). The water passing hole (19e1) is opposite to one side of the bottom of the intermediate channel (19f) and away from the water inlet channel (16a1).

7. The safety device of the propane heat pump system according to claim 5, characterized in that, The microbubble adsorption net (19) includes an outer net cylinder (19b) in the shape of a cylinder, a central net cylinder (19k), and an intermediate net cylinder (19c), all of which are made of a pore net. The central net cylinder (19k) is inserted into the outer net cylinder (19b), and an intermediate channel (19f) is formed between the central net cylinder (19k) and the outer net cylinder (19b). The intermediate net cylinder (19c) is inserted into the intermediate channel (19f), and there are several intermediate net cylinders (19c) arranged in sequence along the outer circumference of the central net cylinder (19k). The bottom of the outer net cylinder (19b) is covered with a water control sealing plate (19e), and a water passing hole (19e1) communicating with the water outlet channel (16b1) is opened on the water control sealing plate (19e). The water inlet channel (16a1) is located on the outer peripheral side of the outer net cylinder (19b), and the water passing hole (19e1) is opposite to the inner hole of the central net cylinder (19k).

8. The safety device of the propane heat pump system according to claim 6, characterized in that, The microbubble adsorption net (19) further includes a spiral net cylinder (19d) formed by spirally winding a pore net, and the spiral net cylinder (19d) is inserted into each intermediate net cylinder (19c).

9. The safety device of the propane heat pump system according to claim 8, characterized in that, The bottom ends of the intermediate net cylinder (19c) and the spiral net cylinder (19d) are both abutted against the water control sealing plate (19e). The side walls of two adjacent intermediate net cylinders (19c) are abutted against each other, and the side walls of the intermediate net cylinder (19c) are also respectively abutted against the central cylinder (19a) and the outer net cylinder (19b).

10. The safety device of the propane heat pump system according to claim 6, characterized in that, There is a water passing gap (19g) between the bottom surface of the central cylinder (19a) and the water control sealing plate (19e).

11. The safety device of the propane heat pump system according to claim 5, characterized in that, The valve core (17) includes a valve needle (17a) inserted into the exhaust channel (16c1). A spring (17b) is connected to the valve needle (17a). The valve needle (17a) has a sealing portion (17a1). Under the action of the spring (17b), the sealing portion (17a1) abuts upward against the wall surface of the exhaust channel (16c1) and seals. The lower end of the valve needle (17a) extends out of the exhaust channel (16c1) and is connected to a lever (17c). One end of the lever (17c) is hinged to the valve body (16), and the other end of the lever (17c) is connected to a hook (17d). A floating block (17e) located above the adsorption filter net (19) is fixed to the lower end of the hook (17d).

12. The safety device of the propane heat pump system according to claim 5, characterized in that, A cover plate (21) is fixed on the top wall of the valve body (16). An exhaust hole (21a) is formed in the cover plate (21). The exhaust passage (16c1) includes the exhaust hole (21a). A valve seat (22) located below the exhaust hole (21a) is snap-fitted and fixed on the cover plate (21). The valve core (17) includes a valve needle (17a) inserted through the valve seat (22) and a lever (17c) connected to the valve needle (17a). A through slot (22a) is formed in the valve seat (22). One end of the lever (17c) passes through the slot (22a) and is hinged on the cover plate (21). The upper end of the valve needle (17a) passes through the lever (17c) and has a sealing portion (17a1). A spring (17b) is connected between the valve needle (17a) and the valve seat (22). Under the action of the spring (17b), the sealing portion (17a1) abuts upward against the wall surface of the exhaust hole (21a) and seals it. The other end of the lever (17c) is connected with a hook (17d). A floating block (17e) located above the adsorption filter screen (19) is fixed at the lower end of the hook (17d).

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