A temperature control structure for diaphragm reciprocating pumps suitable for high temperature and high pressure conditions

Abstract

This invention relates to the field of positive displacement pumps and high-temperature medium transportation technology, and discloses a temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions. The structure includes a three-head pump body, a pumping structure, and three pump pipes connecting the two. The pump head jacket cavities of the three pump heads are connected in series via jacket cavity connecting pipes, and are respectively connected to a steam inlet pipe and a steam outlet pipe. Each pump pipe is fitted with a jacket pipe to form a water cavity. The three water cavities are connected in series via cooling connecting pipes, and are respectively connected to a cooling water inlet pipe and a cooling water outlet pipe. During the reciprocating transportation process, the pumped medium undergoes repeated heat exchange through the pump pipes, and the steam heating of the pump heads compensates for the heat of the medium, keeping the temperature of the diaphragm region between the medium crystallization temperature and the diaphragm's tolerance temperature, thus reducing medium crystallization blockage and diaphragm overheating damage.

Description

Technical Field

[0001] This invention relates to the technical field of positive displacement pumps and high-temperature medium conveying equipment, and in particular to a temperature control structure for a diaphragm reciprocating pump that uses a combination of heating the diaphragm pump head and cooling the pump pipe to keep the temperature of the diaphragm cavity area above the crystallization temperature of the pumped medium and below the diaphragm's tolerance temperature. Background Technology

[0002] Liquid sulfur, as well as some high-melting-point, easily crystallizing, or high-viscosity media, typically need to remain in a fluid state at high temperatures and be pumped to process pipelines with certain pressure requirements. The transportation of such media requires not only pumps with high outlet pressure and stable flow output, but also minimizing media leakage, cooling crystallization, and flow channel blockage during the pumping process. Existing high-temperature, high-pressure media transportation equipment mainly includes plunger reciprocating pumps, centrifugal pumps, and diaphragm positive displacement pumps. While plunger reciprocating pumps can achieve high discharge pressure through the reciprocating motion of the plunger within the pumping chamber, the reciprocating dynamic seal between the plunger and packing is prone to wear and leakage during long-term operation, limiting their application to toxic, corrosive, or non-leaking media. Centrifugal pumps, operating under high-temperature, high-pressure conditions, typically require high-temperature resistant shaft seals, bearing cooling, and auxiliary sealing systems, resulting in higher requirements for equipment configuration and maintenance.

[0003] Diaphragm reciprocating pumps are positive displacement reciprocating pumps. They typically use a mechanical or hydraulic drive mechanism to cause the diaphragm to reciprocate, periodically changing the volume of the pumping chamber. This, combined with inlet and outlet check valves, completes the intake and discharge strokes of the medium. The diaphragm isolates the pumped medium from the drive mechanism or drive fluid, thus offering advantages such as good sealing, stable discharge pressure, high metering accuracy, and suitability for transporting hazardous media. However, when used for transporting high-temperature media, the diaphragm, pump head, pumping chamber, and check valve assembly are simultaneously affected by both the medium temperature and pumping pressure. Especially under conditions of continuous reciprocating deflection, alternating pressure differentials, and the thermal effects of the medium, the allowable operating temperature of the diaphragm is usually lower than the static temperature resistance limit of the diaphragm material.

[0004] Taking polytetrafluoroethylene (PTFE) diaphragms as an example, the material itself has high static temperature resistance. However, during the suction and discharge strokes of a diaphragm reciprocating pump, the diaphragm needs to repeatedly bend and deform and withstand pressure changes within the pumping chamber. When the temperature of the pumped medium remains higher than the diaphragm's allowable dynamic operating temperature, the diaphragm is prone to thermal creep, accelerated fatigue, decreased sealing performance, and even damage, thus affecting the pressure output stability and continuous operation safety of the positive displacement pump. If the diaphragm pump head or pumping chamber is directly subjected to forced cooling, the temperature of the medium near the diaphragm, inlet check valve, or outlet check valve may drop below the crystallization point or freezing point, causing blockage of the pumping flow channel, malfunction of the check valve, insufficient filling of the pumping chamber, and difficulty in starting the diaphragm reciprocating pump.

[0005] Existing heat tracing structures for diaphragm reciprocating pumps typically focus on overall insulation of the pump head, valve assembly, or media pipeline to prevent high-melting-point media from solidifying. However, this simple heat tracing method is insufficient to prevent the continuous transfer of heat from the high-temperature media to the diaphragm region during the suction and discharge strokes, meaning the diaphragm may still be in a high-temperature environment. While existing simple cooling methods can reduce the temperature of the media or pump head, they easily cause high-melting-point media to crystallize in the pumping chamber, check valve assembly, or connecting channels, and their cooling effect is easily affected by changes in cooling water temperature, flow rate, and ambient temperature.

[0006] Especially when the temperature difference between the crystallization temperature of the pumped medium and the allowable dynamic operating temperature of the diaphragm is small, the diaphragm reciprocating pump needs to complete the high-pressure suction and discharge process within a narrow temperature range. Neither pump head heating nor overall cooling can simultaneously meet the requirements of preventing medium crystallization and diaphragm overheating. Therefore, it is necessary to provide a temperature control structure that separates the heating and cooling zones, and utilizes the reciprocating flow of the pumped medium during the suction and discharge strokes for repeated heat exchange, specifically addressing the arrangement of the pump head, pumping chamber, connecting pump pipes, and check valve assembly in a positive displacement diaphragm reciprocating pump. This structure aims to create a dynamic temperature balance near the diaphragm chamber that is higher than the medium crystallization temperature but lower than the allowable operating temperature of the diaphragm. Summary of the Invention

[0007] The purpose of this invention is to overcome the contradiction in the transportation of high-temperature, easily crystallizing media: "lowering the pump head temperature leads to media crystallization, while maintaining the high temperature of the media leads to diaphragm overheating." This invention provides a temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions. This structure involves moving the one-way valve assembly upwards, placing a cooled pump pipe between the one-way valve assembly and the diaphragm pump head, and setting a heating zone at the diaphragm pump head. This allows the pumped medium to repeatedly pass through the cooling heat exchange section during the suction and discharge strokes, while the heating section at the pump head compensates for the heat, thereby creating an adjustable dynamic temperature window between the media crystallization temperature and the diaphragm's withstand temperature.

[0008] To achieve the above objectives, the present invention adopts the following technical solution.

[0009] A temperature control structure for a diaphragm reciprocating pump suitable for high temperature and high pressure conditions includes a temperature control structure installed on the diaphragm reciprocating pump. The diaphragm reciprocating pump includes a pump mounting base. A motor, a reducer, and a three-head pump body are sequentially installed on the pump mounting base. The three-head pump body and the reducer, as well as the reducer and the three-head pump body, are connected by a coupling transmission box. The three-head pump body has three pump heads, each with a matching pump head jacket cavity. The three pump heads are designated as pump head A, pump head B, and pump head C. Pump head A and pump head C are respectively connected to a diaphragm cavity jacket steam inlet pipe and a diaphragm cavity jacket steam outlet pipe. These pipes connect the pump head jacket cavities in pump head A and pump head C. The pump head jacket cavities in pump head A and pump head B are connected via a jacket cavity connecting pipe A. Pump head B and pump head C... The pump head jacket cavities are connected by a jacket cavity connecting pipe B. Steam enters the pump head jacket cavity in pump head A from the diaphragm cavity jacket steam inlet pipe. The steam in the pump head jacket cavity in pump head A enters the pump head jacket cavity in pump head B through the jacket cavity connecting pipe A. The steam in the pump head jacket cavity in pump head B enters the pump head jacket cavity in pump head C through the jacket cavity connecting pipe B, and then exits from the diaphragm cavity jacket steam outlet pipe, thereby heating the three-head pump body.

[0010] The temperature control structure includes a pumping structure and three pump tubes connected between the three-head pump body and the pumping structure. The three pump heads of the three-head pump body are all connected to pump pipes, and a pumping structure is connected between the three pump pipes. The pumping structure includes a pumping box, with multiple pump outlet connecting pipes at the top and a pump inlet connecting pipe at the bottom. The pumping box, pump outlet connecting pipes, and pump inlet connecting pipes are connected together by a tie rod and a positioning plate. The ends of the multiple pump outlet connecting pipes furthest from the pumping box are connected to a common pump outlet pipe, and the ends of the multiple pump inlet connecting pipes furthest from the pumping box are connected to a common pump inlet pipe. The pumping medium inlet pipe is located at one end of the pumping pipe, and the pumping medium outlet pipe is located at the other end of the pumping pipe. There are one-way valves in the pumping inlet pipe and the pumping outlet pipe. The diaphragm reciprocating pump operates as follows: when the diaphragm bulges and separates, it generates suction, which is drawn through the pumping pipe and creates negative pressure on the pumping box. Under negative pressure, the pumping box draws the medium into the pumping box through the pumping inlet connecting pipe, the pumping inlet pipe, and the pumping medium inlet pipe. When the diaphragm closes together, it generates a pushing force to discharge the medium in the pumping box through the pumping outlet connecting pipe and the pumping outlet pipe and from the pumping medium outlet pipe.

[0011] The three pump pipes are connected at both ends by a pump check valve assembly connecting flange and a three-head pump body connecting flange via threaded connections. The pump check valve assembly connecting flange and the three-head pump body connecting flange are connected to the pump pipes. The pump check valve assembly connecting flange is connected to the pumping box. The three-head pump body connecting flange is connected to the three-head pump body via bolts. The pumping box and the three-head pump body are connected via the pump check valve assembly connecting flange, the three-head pump body connecting flange and the pump pipes.

[0012] Each of the three pump pipes has a cooling jacket fitting on the outside. Each cooling jacket fitting includes a jacket tube, and both ends of the jacket tube are welded to the outside of the pump pipe, forming a water cavity between the inside of the jacket tube and the outside of the pump pipe. The three water cavities are denoted as water cavity A, water cavity B, and water cavity C. For ease of description, the three jacket tubes are respectively denoted as sleeve A, sleeve B, and sleeve C. Cooling water inlet pipe is connected to sleeve A, and cooling water outlet pipe is connected to sleeve C. Water cavity A in sleeve A is connected to water cavity B in sleeve B through cooling connecting pipe A, and water cavity B in sleeve B is connected to water cavity B in sleeve C through cooling connecting pipe B. Cooling water enters water cavity A from the cooling water inlet pipe, and after filling water cavity A, it enters water cavity B through cooling connecting pipe A. After filling water cavity B, the cooling water enters water cavity C through cooling connecting pipe B. After filling water cavity C, the cooling water is discharged from the cooling water outlet pipe to cool the pumped medium.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects.

[0014] 1. This invention sets up a steam heating zone at the three-head pump body and a cooling zone at the pump pipe between the three-head pump and the pumping structure, separating the heating and cooling positions. Pump pipe cooling reduces the temperature of the medium entering the diaphragm cavity, while pump head heating prevents medium crystallization. This balances the diaphragm's temperature resistance requirements with the anti-crystallization requirements of high-temperature media, resolving the contradiction that simple heating easily leads to diaphragm overheating, while simple cooling easily leads to medium crystallization.

[0015] 2. The pumped medium passes through the pump pipe during both the suction and discharge strokes and exchanges heat with the cooling water in the external water chamber of the pump pipe. This allows the pumped medium to repeatedly pass through the cooling heat exchange section within one reciprocating pumping cycle. Compared to a structure that only cools once at the medium inlet, this increases the heat exchange frequency, reduces the continuous heat transfer from the high-temperature medium to the diaphragm area, and lowers the risk of diaphragm creep, accelerated fatigue, and thermal damage.

[0016] 3. The pump head jacket cavities of the three pump heads are connected in series via jacket cavity connecting pipe A and jacket cavity connecting pipe B, so that steam can flow continuously through the three pump heads; the water cavities outside the three pump pipes are connected in series via cooling connecting pipe A and cooling connecting pipe B, so that cooling water can flow continuously through the three cooling jacket pipe fittings. This structure can reduce the number of dispersed inlet and outlet pipes and enable the three pump heads and three pump pipes to obtain continuous heating and cooling effects respectively.

[0017] 4. The cooling water inlet pipe, cooling connecting pipe A, cooling connecting pipe B, and cooling water outlet pipe are arranged alternately on the three jacketed pipes, so that the cooling water flows through and fills water chamber A, water chamber B, and water chamber C in sequence, reducing short-circuiting and local stagnation, which helps to improve the heat exchange uniformity of the three pump pipes and avoids the medium temperature corresponding to a single pump head being significantly higher.

[0018] 5. The pumping structure and the three-head pump body 1 are separated by pump pipes, which provides an independent installation and heat exchange space for the cooling jacket fittings. There is no need to directly force cooling the diaphragm pump head. Therefore, while reducing the heat load in the diaphragm area, the pump head heat tracing conditions can be retained, reducing the probability of crystallization blockage or start-up difficulties in the pump head flow channel, near the diaphragm cavity and check valve.

[0019] 6. The two ends of the jacketed pipe are welded and sealed to the pump pipe to form a water chamber. The pump pipe is connected to the pumping structure and the three-head pump body via the pump check valve assembly flange and the three-head pump body flange, respectively. The pumping box, pump outlet connecting pipe, and pump inlet connecting pipe are connected as a whole by tie rods and positioning plates. The above connection structure takes into account the sealing performance of the cooling water chamber, the pressure stability of the pumped medium flow channel, and the convenience of component disassembly and maintenance, making it more suitable for the continuous transportation of high temperature and high pressure media.

[0020] 7. This invention, through the coordination of pump pipe cooling and pump head heat tracing, enables the temperature of the diaphragm cavity area to be maintained within a temperature range above the crystallization temperature of the pumped medium and below the allowable operating temperature of the diaphragm. It is particularly suitable for media conveying conditions where the temperature difference between the crystallization temperature and the allowable diaphragm temperature is small, which helps to extend the service life of the diaphragm and improve the continuity of the operation of the diaphragm reciprocating pump. Attached Figure Description

[0021] Figure 1 This is a planar schematic diagram of a temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions.

[0022] Figure 2 for Figure 1 Schematic diagram of the pumping structure; Figure 3 for Figure 2 Schematic diagram of cooling jacket fittings, pump pipes, and jacket pipes; Figure 4 for Figure 3 A schematic diagram showing the pump pipe protruding from the cut-out of the jacketed pipe; Figure 5 for Figure 4 Another perspective view in the middle; Figure 6 for Figure 1 A schematic diagram showing the connection of the diaphragm chamber jacketed steam inlet pipe and the diaphragm chamber jacketed steam outlet pipe to the three-head pump body.

[0023] Reference numerals: 1. Three-head pump body; 2. Diaphragm chamber jacketed steam inlet pipe; 3. Diaphragm chamber jacketed steam outlet pipe; 4. Pumping medium outlet pipe; 5. Cooling water inlet pipe; 6. Pumping medium inlet pipe; 7. Cooling water outlet pipe; 8. Cooling jacket fittings; 81. Pump pipe; 811. Pump check valve assembly connecting flange; 812. Three-head pump body connecting flange; 82. Jacketed pipe; 821. Cooling connecting pipe A; 822. Cooling connecting pipe B; 9. Coupling transmission box; 10. Motor; 11. Reducer; 12. Pump mounting base; 13. Pumping structure; 131. Pumping box; 132. Pump outlet connecting pipe; 133. Pump inlet pipe; 134. Pump outlet pipe; 135. Pump inlet connecting pipe; 136. Tie rod; 137. Positioning plate; 14. Jacketed chamber connecting pipe A; 15. Jacketed chamber connecting pipe B. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the concept of the present invention, those skilled in the art can make adaptive adjustments to the steam temperature, steam flow rate, cooling water temperature, cooling water flow rate, pump pipe length, and jacket pipe size according to the crystallization temperature, operating temperature, viscosity, conveying pressure, and allowable operating temperature of the diaphragm material of the pumping medium.

[0025] Reference Figures 1 to 6 This embodiment provides a temperature control structure for a diaphragm reciprocating pump suitable for high temperature and high pressure conditions, including a three-head pump body 1, a pumping structure 13, and three pump pipes 81 connected between the three-head pump body 1 and the pumping structure 13.

[0026] Reference Figure 1 The diaphragm reciprocating pump also includes a pump mounting base 12, a motor 10, a reducer 11, and a coupling transmission box 9. The motor 10, the reducer 11, and the three-head pump body 1 are sequentially mounted on the pump mounting base 12. The motor 10 and the reducer 11, as well as the reducer 11 and the three-head pump body 1, are respectively connected by the coupling transmission box 9. The power output by the motor 10 is reduced and amplified by the reducer 11 and then transmitted to the three-head pump body 1 to drive the diaphragm inside the three-head pump body 1 to reciprocate.

[0027] The three-head pump body 1 includes pump heads A, B, and C arranged sequentially, each with a pump head jacket cavity corresponding to the diaphragm cavity region. Pump head A is connected to a diaphragm cavity jacket steam inlet pipe 2, and pump head C is connected to a diaphragm cavity jacket steam outlet pipe 3. The pump head jacket cavity of pump head A is connected to the pump head jacket cavity of pump head B through a jacket cavity connecting pipe A14, and the pump head jacket cavity of pump head B is connected to the pump head jacket cavity of pump head C through a jacket cavity connecting pipe B15.

[0028] Thus, the diaphragm cavity jacketed steam inlet pipe 2, the pump head jacket cavity of pump head A, the jacket cavity connecting pipe A14, the pump head jacket cavity of pump head B, the jacket cavity connecting pipe B15, the pump head jacket cavity of pump head C, and the diaphragm cavity jacketed steam outlet pipe 3 form a series steam flow path.

[0029] During operation, steam enters the pump head jacket cavity of pump head A through the steam inlet pipe 2 of the diaphragm cavity jacket, and flows through the pump head jacket cavities of pump head B and pump head C in sequence, and finally exits through the steam outlet pipe 3 of the diaphragm cavity jacket. During the flow process, the steam heats the three pump heads, keeping the pumping medium near the diaphragm cavity in a flowing state and preventing the medium from crystallizing, solidifying or excessively increasing in viscosity inside the pump head.

[0030] Reference Figure 1 and Figure 2 The pumping structure 13 is located on one side or above the three-head pump body 1, and includes a pumping box 131, multiple pumping outlet connecting pipes 132, a pumping outlet pipe 134, multiple pumping inlet connecting pipes 135 and a pumping inlet pipe 133.

[0031] The top of the pumping box 131 is connected to multiple pumping outlet connecting pipes 132. The ends of the multiple pumping outlet connecting pipes 132 away from the pumping box 131 are connected to the pumping outlet pipe 134. The end of the pumping outlet pipe 134 is connected to the pumping medium outlet pipe 4. The bottom of the pumping box 131 is connected to multiple pumping in connecting pipes 135. The ends of the multiple pumping in connecting pipes 135 away from the pumping box 131 are connected to the pumping inlet pipe 133. The end of the pumping inlet pipe 133 is connected to the pumping medium inlet pipe 6.

[0032] In this embodiment, three pump outlet connecting pipes 132 and three pump inlet connecting pipes 135 are provided, each corresponding to one of the three pump heads of the three-head pump body 1. The pumping box 131, the pump outlet connecting pipes 132 and the pump inlet connecting pipes 135 are connected as one unit by a tie rod 136 and a positioning plate 137. The tie rod 136 provides axial tension to the upper and lower connecting parts of the pumping structure 13, and the positioning plate 137 positions each pump outlet connecting pipe 132 and pump inlet connecting pipe 135 to improve the connection stability of the pumping structure 13 under high-pressure conveying conditions.

[0033] A liquid inlet check valve is installed in the pump inlet pipe 133. The liquid inlet check valve allows the pumping medium to flow from the pumping medium inlet pipe 6 to the pumping tank 131 and prevents the pumping medium from flowing back to the pumping medium inlet pipe 6. A liquid outlet check valve is installed in the pump outlet pipe 134. The liquid outlet check valve allows the pumping medium to flow from the pumping tank 131 to the pumping medium outlet pipe 4 and prevents the pumping medium that has been discharged from flowing back to the pumping tank 131.

[0034] Reference Figures 2 to 5Three pump pipes 81 are respectively connected between the three pump heads of the three-head pump body 1 and the pumping structure 13. One end of each pump pipe 81 is threaded to a pump check valve assembly connecting flange 811, and the other end is threaded to a three-head pump body connecting flange 812. The pump check valve assembly connecting flange 811 is connected to the pumping box 131, and the three-head pump body connecting flange 812 is connected to the corresponding pump head by bolts, so that the pumping box 131 is connected to the medium chamber of the three pump heads through the three pump pipes 81 respectively.

[0035] The pump pipe 81 is made of metal fittings that can withstand pumping pressure and medium temperature. The two ends of the pump pipe 81 are connected by a combination of threads and flanges. On the one hand, it is convenient for the pump pipe 81 to be reliably connected to the pumping structure 13 and the three-head pump body 1. On the other hand, it is convenient to disassemble a single pump pipe 81 or the corresponding pump head during maintenance.

[0036] Each pump pipe 81 is provided with a cooling jacket fitting 8 on its exterior. The cooling jacket fitting 8 includes a jacket pipe 82 sleeved on the outside of the pump pipe 81. Both ends of the jacket pipe 82 are welded and sealed to the outer wall of the pump pipe 81, so that a closed annular water cavity is formed between the inner wall of the jacket pipe 82 and the outer wall of the pump pipe 81. The jacket pipe 82 is located between the pump one-way valve group connecting flange 811 and the three-head pump body connecting flange 812, so that the cooling water and the pumping medium flowing through the pump pipe 81 can exchange heat indirectly.

[0037] For ease of explanation, the three jacketed tubes 82 are referred to as sleeve A, sleeve B and sleeve C, respectively, and the water cavities formed inside the three jacketed tubes 82 are referred to as water cavity A, water cavity B and water cavity C, respectively.

[0038] The lower part of the sleeve A is connected to a cooling water inlet pipe 5 that communicates with the water cavity A. The water cavity A and the water cavity B are connected by a cooling connecting pipe A821. The water cavity B and the water cavity C are connected by a cooling connecting pipe B822. The upper part of the sleeve C is connected to a cooling water outlet pipe 7 that communicates with the water cavity C.

[0039] In this embodiment, cooling connecting pipe A821 is connected to the upper part of sleeve A and sleeve B, and cooling connecting pipe B822 is connected to the lower part of sleeve B and sleeve C. After cooling water enters water cavity A through cooling water inlet pipe 5, it flows upward from the lower part of water cavity A and enters water cavity B through cooling connecting pipe A821. Cooling water flows downward in water cavity B and enters water cavity C through cooling connecting pipe B822. Cooling water flows upward in water cavity C and is finally discharged through cooling water outlet pipe 7.

[0040] Through the above-mentioned alternating series flow method, the cooling water can sequentially fill water chamber A, water chamber B and water chamber C, reducing the formation of short-flow areas or stagnant areas in the water chambers that do not participate in heat exchange, so that all three pump pipes 81 can exchange heat with the cooling water.

[0041] In operation, this invention first introduces steam into the jacket cavities of the three pump heads based on the crystallization temperature of the pumping medium and the allowable operating temperature of the diaphragm material, and then introduces cooling water into the water cavities outside the three pump pipes 81. The steam heats the three-head pump body 1, while the cooling water cools the pumping medium flowing through the pump pipes 81.

[0042] After the motor 10 starts, it drives the three-head pump body 1 to run through the reducer 11 and the coupling transmission box 9. When the diaphragm in the corresponding pump head moves in the suction direction, suction is formed in the medium chamber of the pump head, the inlet check valve opens, and the outlet check valve closes. The pumping medium enters the corresponding pump pipe 81 through the pumping medium inlet pipe 6, the pump inlet pipe 133, the pump inlet connecting pipe 135, and the pumping box 131 in sequence, and then enters the medium chamber of the corresponding pump head through the pump pipe 81.

[0043] When the pumping medium passes through the pump pipe 81, it indirectly exchanges heat with the cooling water in the external water cavity of the pump pipe 81, which lowers the temperature of the medium entering the diaphragm cavity and reduces the heat continuously transferred from the high-temperature medium to the diaphragm.

[0044] When the diaphragm in the corresponding pump head moves in the discharge direction, the inlet check valve closes and the outlet check valve opens. The pumping medium in the pump head medium chamber returns to the pumping box 131 through the pump pipe 81, and is discharged in sequence through the pump outlet connecting pipe 132, the pump outlet pipe 134 and the pumping medium outlet pipe 4.

[0045] During the discharge process, the pumping medium flows through the pump pipe 81 again and exchanges heat with the cooling water again. Therefore, the pumping medium passes through the cooling heat exchange section formed by the pump pipe 81 in each suction stroke and discharge stroke, which increases the heat exchange frequency per unit pumping cycle.

[0046] At the same time, the pump head jacket cavity of the three pump heads continuously provides steam heating to the vicinity of the diaphragm cavity, replenishing the heat of the cooled pumping medium and preventing the medium from dropping below the crystallization temperature inside the pump head, near the diaphragm cavity, or in the one-way valve flow channel.

[0047] The cooling zone outside the pump pipe 81 and the heating zone at the three-head pump body 1 are separated along the flow path of the pumped medium. The cooling zone is used to reduce the heat load transferred from the high-temperature medium to the diaphragm, and the heating zone is used to prevent the medium from crystallizing or solidifying. By adjusting the temperature and flow rate of steam and cooling water, the operating temperature of the diaphragm cavity area is made higher than the crystallization temperature of the pumped medium and lower than the allowable operating temperature of the diaphragm material, thereby forming a dynamic temperature window suitable for the continuous operation of the diaphragm reciprocating pump.

[0048] For liquid sulfur and other high-melting-point, easily crystallizing, or high-viscosity media, the supply parameters of steam and cooling water can be determined according to the physical properties of the media. For media with a small temperature difference between the crystallization temperature and the allowable temperature of the diaphragm, the effective heat exchange length of the pump pipe 81 and the jacket pipe 82 can be appropriately extended, or the cooling water flow rate can be adjusted to change the cooling heat exchange capacity. The heat tracing of the pump head can also be changed by adjusting the steam flow rate, thereby adapting to different conveying conditions.

[0049] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any equivalent changes, substitutions, combinations, or simplifications made to the number of pump heads, jacket length, connecting pipe position, pipeline connection form, and heat exchange medium type without departing from the spirit and basic principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature control structure for a diaphragm reciprocating pump suitable for high temperature and high pressure conditions, comprising a three-head pump body (1), a pumping structure (13), and three pump pipes (81) connected between the three-head pump body (1) and the pumping structure (13). The three-head pump body (1) includes pump head A, pump head B and pump head C. Pump head A, pump head B and pump head C are respectively provided with pump head jacket cavities. The pump head jacket cavity of pump head A is connected to the pump head jacket cavity of pump head B through the jacket cavity connecting pipe A (14). The pump head jacket cavity of pump head B is connected to the pump head jacket cavity of pump head C through the jacket cavity connecting pipe B (15). Pump head A is connected to a diaphragm cavity jacket steam inlet pipe (2) that is connected to its pump head jacket cavity. Pump head C is connected to a diaphragm cavity jacket steam outlet pipe (3) that is connected to its pump head jacket cavity. Three pump pipes (81) are connected to pump head A, pump head B and pump head C in a one-to-one correspondence. Each pump pipe (81) is provided with a jacket pipe (82) on the outside. A water cavity is formed between the inner wall of the jacket pipe (82) and the outer wall of the corresponding pump pipe (81). The three jacket pipes (82) are referred to as jacket A, jacket B and jacket C in sequence. The three water cavities are referred to as water cavity A, water cavity B and water cavity C in sequence. Water cavity A and water cavity B are connected by cooling connecting pipe A (821), and water cavity B and water cavity C are connected by cooling connecting pipe B (822). Sleeve A is connected to a cooling water inlet pipe (5) connected to water cavity A, and sleeve C is connected to a cooling water outlet pipe (7) connected to water cavity C.

2. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 1, characterized in that, It also includes a pump mounting base (12), a motor (10) and a reducer (11). The three-head pump body (1), the reducer (11) and the motor (10) are all mounted on the pump mounting base (12). The motor (10) is connected to the three-head pump body (1) through the reducer (11).

3. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 2, characterized in that, The motor (10) and the reducer (11) are connected by a coupling transmission box (9) and the reducer (11) is connected to the three-head pump body (1).

4. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 1, characterized in that, Each pump pipe (81) has a pump check valve assembly connecting flange (811) and a three-head pump body connecting flange (812) threaded to both ends. The pump check valve assembly connecting flange (811) is connected to the pumping structure (13), and the three-head pump body connecting flange (812) is connected to the three-head pump body (1) by bolts.

5. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 4, characterized in that, The jacketed tube (82) is fitted around the outer periphery of the corresponding pump tube (81) and located between the pump check valve assembly connecting flange (811) and the three-head pump body connecting flange (812). The two ends of the jacketed tube (82) are welded and sealed to the outer wall of the corresponding pump tube (81).

6. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 1, characterized in that, Cooling water inlet pipe (5) is located at the lower part of sleeve A, cooling connecting pipe A (821) is connected to the upper part of sleeve A and sleeve B, cooling connecting pipe B (822) is connected to the lower part of sleeve B and sleeve C, cooling connecting pipe A (821) is connected to sleeve A and sleeve B, and cooling water outlet pipe (7) is located at the upper part of sleeve C.

7. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 1, characterized in that, The pumping structure (13) includes a pumping box (131), with multiple pumping outlet connecting pipes (132) connected to the top of the pumping box (131) and multiple pumping in connecting pipes (135) connected to the bottom of the pumping box (131). Multiple pump outlet connecting pipes (132) are connected to a pump outlet pipe (134) at the end away from the pumping box (131), and multiple pump inlet connecting pipes (135) are connected to a pump inlet pipe (133) at the end away from the pumping box (131). The pump outlet pipe (134) is connected to a pumping medium outlet pipe (4), and the pump inlet pipe (133) is connected to a pumping medium inlet pipe (6).

8. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 7, characterized in that, The pump outlet connecting pipe (132) and the pump inlet connecting pipe (135) are both set to three, and are respectively corresponding to the three pump heads of the three-head pump body (1). The pumping box (131), the pump outlet connecting pipe (132) and the pump inlet connecting pipe (135) are connected as one unit by the tie rod (136) and the positioning plate (137).

9. A temperature control structure for a diaphragm reciprocating pump suitable for high-temperature and high-pressure conditions according to claim 7, characterized in that, A one-way valve is provided in the pump inlet pipe (133) to allow the pumping medium to flow from the pumping medium inlet pipe (6) to the pumping box (131), and a one-way valve is provided in the pump outlet pipe (134) to allow the pumping medium to flow from the pumping box (131) to the pumping medium outlet pipe (4).

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