Water bath heating double-acting pump

Abstract

The utility model provides a water bath heating double-acting pump which comprises a frame body, a linear driving mechanism, a pumping assembly and a heating assembly, and the linear driving mechanism is installed on the frame body; the pumping assembly comprises a cylinder body, a rod body, a piston, a first one-way valve and a second one-way valve, the cylinder body is installed on the frame body, the piston is slidably connected into the cylinder body, the two ends of the rod body are connected with the piston and the output end of the linear driving mechanism respectively, and the piston divides a rod cavity and a rodless cavity in the cylinder body; a feed port communicated with the rodless cavity and a discharge port communicated with the rod cavity are formed in the cylinder body; the first one-way valve is arranged on the piston, communicates with the rod cavity and the rodless cavity, and enables materials in the rodless cavity to flow to the rod cavity in one direction; the second one-way valve is arranged at the feeding hole in the cylinder body, so that the material flows into the rodless cavity in one direction; the heating assembly is arranged outside the cylinder in a surrounding mode. Materials are directly heated in the pumping process, waiting is not needed, and the heating efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of emulsion explosive conveying equipment, in particular to a water bath heated double-acting pump. Background Art

[0002] Emulsion explosives are widely used in mining and tunnel construction, but one disadvantage of emulsion explosives is that the prepared emulsion explosives cannot be stored for too long. Emulsion explosives stored for too long may cause segregation and stratification, which will affect the use of emulsion explosives. Therefore, emulsion explosives are prepared in time or on-site when used. In the process of production and preparation of existing emulsion explosives, three raw materials, namely water phase, oil phase and sensitizer, are generally used, and a mixing emulsifier is used to fully mix, sensitize and emulsify them at a set temperature.

[0003] The existing design sets a heating rod in the material storage tank, and directly heats the material in the material storage tank through the electric heating rod. The disadvantage of this arrangement is that all the materials in the storage tank need to be heated. When a small amount of emulsion explosive is urgently needed, it is necessary to wait for all the materials in the storage tank to be heated to the set temperature before the delivery pump can be driven to carry out the delivery work, which takes a long time. After a small amount of emulsion explosive is configured, if the emulsion explosive is not further configured within a short period of time, the heat of the material in the storage tank will slowly dissipate, resulting in a waste of energy.

[0004] In summary, there is an urgent need for a water bath heated double-acting pump to solve or at least partially solve the problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a double-acting pump for water bath heating, aiming to solve the problem that the existing equipment cannot meet the requirement of quickly heating the raw materials to the set temperature. The specific technical scheme is as follows:

[0006] A double-acting pump for water bath heating comprises a frame, a linear drive mechanism, a pumping assembly and a heating assembly, wherein the linear drive mechanism is mounted on the frame; the pumping assembly comprises a cylinder, a rod, a piston, a first one-way valve and a second one-way valve, the cylinder is mounted on the frame, the piston is slidably connected in the cylinder, the first end of the rod is fixedly connected to the piston, the second end of the rod extends from one end of the cylinder and is connected to the output end of the linear drive mechanism, and the piston separates a rod chamber and a rodless chamber in the cylinder; a feed port and a discharge port are provided on the cylinder, the feed port is connected to the rodless chamber, and the discharge port is connected to the rod chamber; the first one-way valve is arranged on the piston, the first end of the first one-way valve is connected to the rod chamber, and the second end of the first one-way valve is connected to the rodless chamber, so that the material in the rodless chamber flows to the rod chamber in one direction; the second one-way valve is arranged at the feed port on the cylinder, so that the material flows into the rodless chamber in one direction; the heating assembly is arranged around the outside of the cylinder.

[0007] Furthermore, the heating component includes a sleeve, which is coaxially sleeved outside the barrel, and an annular heating chamber is left between the sleeve and the outer wall of the barrel. The sleeve is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet and the first liquid outlet are both connected to the annular heating chamber.

[0008] Furthermore, the first liquid inlet is arranged at one end close to the discharge port, and the first liquid outlet is arranged at one end close to the feed port.

[0009] Furthermore, the area of ​​the flow cross section of the rodless cavity is twice the area of ​​the flow cross section of the rod cavity.

[0010] Furthermore, a columnar heating chamber is arranged in the rod body, and a second liquid inlet and a second liquid outlet are arranged at one end of the rod body away from the piston, and the second liquid inlet and the second liquid outlet are both connected to the columnar heating chamber.

[0011] Furthermore, a flow guide tube is provided in the columnar heating chamber, a first end of the flow guide tube is connected to the second liquid outlet, and a second end of the flow guide tube extends toward a direction close to the piston and extends to the bottom of the columnar heating chamber.

[0012] Furthermore, the linear drive mechanism is a hydraulic cylinder or an electric push rod or a pneumatic cylinder.

[0013] Furthermore, the first one-way valve includes a ball and an elastic member, and a accommodating chamber, a main channel and a branch channel are provided on the piston. The two ends of the main channel are respectively connected with the rodless chamber and the accommodating chamber, and the two ends of the branch channel are respectively connected with the rod chamber and the accommodating chamber; the ball is arranged in the accommodating chamber, and the ball abuts at the junction of the main channel and the accommodating chamber, the elastic member is arranged in the accommodating chamber, the first end of the elastic member abuts on the ball, and the second end of the elastic member abuts on the inner wall of the accommodating chamber; the diameter of the accommodating chamber is larger than the diameter of the ball, and the diameter of the main channel is smaller than the diameter of the ball.

[0014] Furthermore, a plurality of branch flow channels are arranged, and the plurality of branch flow channels are evenly distributed along the circumference of the piston.

[0015] Furthermore, the heating component also includes a liquid distribution ring, which is arranged in the annular heating chamber and is arranged around the cylinder. The liquid distribution ring is hollow, and the first liquid inlet is connected to the interior of the liquid distribution ring. A plurality of liquid distribution holes are arranged at one end of the liquid distribution ring close to the second one-way valve, and the liquid distribution holes connect the annular heating chamber and the interior of the liquid distribution ring.

[0016] The application of the technical solution of the utility model has the following beneficial effects:

[0017] During the movement of the material of the present application, when the material reaches the rodless cavity, the heating component heats the cylinder body, thereby indirectly heating the material in the rodless cavity inside the cylinder body. When the material moves to the rod cavity, it is heated again. Therefore, during the pumping process, the raw materials for emulsification are directly heated, and there is no need to heat the materials stored in the entire storage tank. There is no need to wait when preparing the emulsified explosive, and the heating efficiency is high.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. Figure 1-Figure 4 , the utility model is further described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a double-acting pump for water bath heating of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of a double-acting pump for water bath heating of the utility model;

[0022] Figure 3 It is a partial enlarged schematic diagram of the interior of a double-acting pump for water bath heating of the utility model;

[0023] Figure 4 yes Figure 3 Magnified view at A in the middle.

[0024] Among them, 1. frame; 2. linear drive mechanism; 3. pumping assembly; 31. cylinder; 311. rod chamber; 312. rodless chamber; 313. feed port; 314. discharge port; 32. rod body; 321. columnar heating chamber; 322. second liquid inlet; 323. second liquid outlet; 324. flow guide tube; 33. piston; 331. accommodating chamber; 332. main flow channel; 333. branch flow channel; 34. first one-way valve; 341. sphere; 342. elastic member; 35. second one-way valve; 4. heating assembly; 41. sleeve; 411. first liquid inlet; 412. first liquid outlet; 42. liquid distribution ring; 421. liquid distribution hole; 43. annular heating chamber. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] Example:

[0028] See also Figure 1-Figure 4 The present embodiment provides a double-acting pump for water bath heating, comprising a frame 1, a linear drive mechanism 2, a pumping assembly 3 and a heating assembly 4, wherein the linear drive mechanism 2 is mounted on the frame 1; the pumping assembly 3 comprises a cylinder 31, a rod 32, a piston 33, a first one-way valve 34 and a second one-way valve 35, the cylinder 31 is mounted on the frame 1, the piston 33 is slidably connected in the cylinder 31, the first end of the rod 32 is fixedly connected to the piston 33, the second end of the rod 32 extends from one end of the cylinder 31 and is connected to the output end of the linear drive mechanism 2, and the piston 33 separates a rod cavity 31 in the cylinder 31 1 and the rodless chamber 312; a feed port 313 and a discharge port 314 are provided on the cylinder 31, the feed port 313 is communicated with the rodless chamber 312, and the discharge port 314 is communicated with the rod chamber 311; a first one-way valve 34 is arranged on the piston 33, a first end of the first one-way valve 34 is communicated with the rod chamber 311, and a second end of the first one-way valve 34 is communicated with the rodless chamber 312, so that the material in the rodless chamber 312 flows unidirectionally to the rod chamber 311; a second one-way valve 35 is arranged at the feed port 313 on the cylinder 31, so that the material flows unidirectionally into the rodless chamber 312; the heating component 4 is arranged around the outside of the cylinder 31.

[0029] It can be known that the piston 33 and the rod body 32 are driven to reciprocate in the cylinder body 31 by the linear drive mechanism 2. When the piston 33 moves upward (moves toward the end away from the rodless chamber 312), the first one-way valve 34 is closed and the second one-way valve 35 is opened. The volume of the rodless chamber 312 increases, and the external materials are sucked into the rodless chamber 312 from the feed port 313. When the linear drive mechanism 2 drives the piston 33 downward (moves toward the end close to the rodless chamber 312), the first one-way valve 34 is turned to open and the second one-way valve 35 is turned to close. The volume of the rodless chamber 312 decreases, and the volume of the rod chamber 311 increases. The materials in the rodless chamber 312 pass through the first one-way valve 34 and the second one-way valve 35 is turned to close. The valve 34 flows into the rod chamber 311. Due to the existence of the rod body 32, the reduced volume of the rodless chamber 312 is greater than the increased volume of the rod chamber 311. Therefore, a part of the material flowing from the rodless chamber 312 to the rod chamber 311 is temporarily stored in the rod chamber 311, and the other excess material is pumped out from the discharge port 314; when the linear drive mechanism 2 drives the piston 33 to move upward again, the first one-way valve 34 turns to closed, and the second one-way valve 35 turns to open. The volume of the rod chamber 311 becomes smaller, and the material temporarily stored in the rod chamber 311 is pumped out from the discharge port 314, the volume of the rodless chamber 312 becomes larger, and the external material continues to be sucked into the rodless chamber 312 from the feed port 313. During the movement of materials, when the materials reach the rodless chamber 312, the heating component 4 heats the cylinder 31, thereby indirectly heating the materials in the rodless chamber 312 in the cylinder 31. When the materials move to the rod chamber 311, they are heated again. Thus, during the pumping process, the raw materials for emulsification are directly heated, and there is no need to heat the materials stored in the entire storage tank. There is no need to wait when configuring the emulsified explosive, and the heating efficiency is high.

[0030] Furthermore, the heating assembly 4 includes a sleeve 41, which is sleeved outside the cylinder 31, and an annular heating chamber 43 is left between the sleeve 41 and the outer wall of the cylinder 31. The sleeve 41 is provided with a first liquid inlet 411 and a first liquid outlet 412, and the first liquid inlet 411 and the first liquid outlet 412 are both connected to the annular heating chamber 43.

[0031] It can be known that hot water is input from the first liquid inlet 411 to fill the entire annular heating chamber 43 with hot water, and the hot water in the annular heating chamber 43 exchanges heat with the cylinder 31 by heat conduction, and the cylinder 31 exchanges heat with the material in the cylinder 31 by heat conduction, so as to achieve heating of the materials in the rodless chamber 312 and the rod chamber 311. During the entire heating process, heat is transferred from the hot water to the cylinder 31 and then to the material, without directly heating the material. The heating process is gentle and not prone to danger, thereby improving the safety of the material heating process. Of course, the liquid used for heating can be a liquid substance that is easy to flow, such as water and oil.

[0032] Further, the first liquid inlet 411 is arranged at one end close to the discharge port 314 , and the first liquid outlet 412 is arranged at one end close to the feed port 313 .

[0033] It can be known that, from the first liquid inlet 411 to the first liquid outlet 412, the temperature of the liquid gradually decreases as the heat exchange proceeds. Therefore, by arranging the first liquid inlet 411 at one end close to the outlet 314 and the first liquid outlet 412 at one end close to the feed port 313, the material is gradually heated in the process of moving from the feed port 313 to the outlet 314, and when the material is pumped out from the outlet 314, the temperature is closer to the temperature of the liquid input by the first liquid inlet 411, so that the material can obtain more heat during the heating process, and the heating effect on the material is better.

[0034] Furthermore, the sleeve 41 is coaxially arranged with the cylinder body 31 , and the flow cross-section area of ​​the rodless cavity 312 is twice the flow cross-section area of ​​the rod cavity 311 .

[0035] It can be known that, through such a setting, when the linear drive mechanism 2 drives the piston 33 and the cylinder body to move upward and downward at the same speed, half of the volume of the material in the rodless chamber 312 enters the rod chamber 311 for temporary storage when the piston 33 moves downward, and the other half is pumped out; when the piston 33 moves upward, the temporarily stored material in the rod chamber 311 is pumped out, so it takes the same time to pump out the same volume of material during the piston 33's upward and downward processes, that is, the flow rate of the material pumped out when the piston 33 moves upward and when the piston 33 moves downward is equal. Through such a setting, when the linear drive mechanism 2 drives the piston 33 and the rod body 32 to move, the flow rate of the pumped material is always stable, creating favorable conditions for subsequent emulsification.

[0036] Furthermore, a columnar heating chamber 321 is provided in the rod body 32 , and a second liquid inlet 322 and a second liquid outlet 323 are provided at one end of the rod body 32 away from the piston 33 . Both the second liquid inlet 322 and the second liquid outlet 323 are connected to the columnar heating chamber 321 .

[0037] It can be known that hot water is input from the second liquid inlet 322, and the hot water undergoes heat exchange in the columnar heating chamber 321, so that the heat is transferred to the rod body 32 by heat conduction, and is transferred from the outer wall of the rod body 32 to the material in the rod chamber 311, thereby heating the material in the rod chamber 311. After the heat exchange occurs, the hot water becomes cold water, and the cold water is discharged from the second liquid outlet 323. After the material is heated once in the rodless chamber 312, it is heated again in the rod chamber 311, and the heating component 4 in the rod chamber 311 and the columnar heating chamber 321 in the rod body 32 heat the material at the same time, so that the heating is more sufficient, the heating efficiency is improved, and the material can be heated quickly. In addition, through hot water isolation heating, because the temperature of the hot water itself is easy to control and the temperature is not too high, the probability of safety accidents during heating is greatly reduced, and the safety of production is improved.

[0038] Furthermore, a flow guide tube 324 is disposed in the columnar heating chamber 321 , a first end of the flow guide tube 324 is connected to the second liquid outlet 323 , and a second end of the flow guide tube 324 extends toward a direction close to the piston 33 and extends to the bottom of the columnar heating chamber 321 .

[0039] It can be known that the hot water moves from the top of the rod body 32 toward the piston 33. As the heat exchange proceeds, the heat in the hot water is continuously dissipated until it is discharged from the guide tube 324 through the second liquid outlet 323. By setting the guide tube 324, the water with the lowest temperature near the end of the piston 33 in the columnar heating chamber 321 is discharged, so that the hot water can transfer as much heat as possible to the material in the rod chamber 311 during the heat exchange process, thereby improving the efficiency of the heat exchange.

[0040] Furthermore, the linear drive mechanism 2 is a hydraulic cylinder or an electric push rod or a pneumatic cylinder.

[0041] It can be known that in this embodiment, the linear drive mechanism 2 is a hydraulic cylinder, the housing of the hydraulic cylinder is fixedly connected to the frame 1 by bolts, the piston 33 of the hydraulic cylinder is hinged to the rod body 32, and when the hydraulic cylinder is working, it pushes the rod body 32 and the piston 33 to move back and forth in the cylinder 31 to achieve the pumping of materials. Similarly, in some other embodiments of the present application, an electric push rod or a cylinder can also be used to replace the hydraulic cylinder to work, and of course, other mechanisms or components that can drive the rod body 32 and the piston 33 to move back and forth in the cylinder 31 can also be used.

[0042] Furthermore, the first one-way valve 34 includes a ball 341 and an elastic member 342, and the piston 33 is provided with a accommodating chamber 331, a main channel 332 and a branch channel 333, the two ends of the main channel 332 are respectively connected with the rodless chamber 312 and the accommodating chamber 331, and the two ends of the branch channel 333 are respectively connected with the rod chamber 311 and the accommodating chamber 331; the ball 341 is arranged in the accommodating chamber 331, and the ball 341 abuts at the junction of the main channel 332 and the accommodating chamber 331, the elastic member 342 is arranged in the accommodating chamber 331, the first end of the elastic member 342 abuts on the ball 341, and the second end of the elastic member 342 abuts on the inner wall of the accommodating chamber 331; the diameter of the accommodating chamber 331 is larger than the diameter of the ball 341, and the diameter of the main channel 332 is smaller than the diameter of the ball 341.

[0043] It can be known that when the piston 33 moves downward, the second one-way valve 35 is closed, the pressure in the rodless chamber 312 increases, and the material in the rodless chamber 312 applies pressure to the ball 341 through the main channel 332, pushing the ball 341 to move upward and compressing the elastic member 342. At this time, the main channel 332 and the accommodating chamber 331 are connected, and the accommodating chamber 331 is connected to the branch channel 333. The first one-way valve 34 is opened, so that the material in the rodless chamber 312 can flow smoothly to the rod chamber 311; when the piston 33 moves upward, the ball 341 moves downward under the elastic force of the elastic member 342, and re-contacts the junction of the accommodating chamber 331 and the main channel 332, closing the main channel 332, and the first one-way valve 34 is closed. It should be noted that, in the present embodiment, the elastic member 342 is a helical compression spring, and in some other embodiments of the present application, the elastic member 342 may also be a rubber spring, a reed, or other component or structure that can accumulate elastic potential energy.

[0044] Furthermore, a plurality of branch channels 333 are arranged, and the plurality of branch channels 333 are evenly distributed along the circumference of the piston 33 .

[0045] It can be known that by arranging multiple branch channels 333, the material can quickly flow from the main channel 332 to the rod chamber 311. In addition, by evenly distributing multiple branch channels 333 along the axial direction of the piston 33, the material in the rodless chamber 312 can be evenly transported toward the rod chamber 311, preventing the material from accumulating in the corner of the rod chamber 311, which is beneficial to heat exchange.

[0046] Furthermore, the heating component 4 also includes a liquid distribution ring 42, which is arranged in the annular heating chamber 43 and is arranged around the cylinder 31. The liquid distribution ring 42 is hollow, and the first liquid inlet 411 is connected to the interior of the liquid distribution ring 42. A plurality of liquid distribution holes 421 are arranged at one end of the liquid distribution ring 42 close to the second one-way valve 35, and the liquid distribution holes 421 connect the annular heating chamber 43 and the interior of the liquid distribution ring 42.

[0047] It can be known that by inputting hot water from the first liquid inlet 411, the hot water enters the liquid distribution ring 42 and flows out evenly from each liquid distribution hole 421 of the liquid distribution ring 42. By setting the liquid distribution ring 42, the hot water can flow evenly from one end of the annular heating chamber 43 to the other end when flowing to the annular heating chamber 43, so that the temperature of each point on the uniform annular surface of the annular chamber is equal, and the uniformity of the temperature in the same annular plane of the annular chamber is improved, so that the material is heated more evenly. If the annular material distribution ring is not set, in the same annular plane, the temperature of the side close to the first liquid inlet 411 is higher than the temperature of the side away from the first liquid inlet 411, so that uneven heating is likely to occur.

[0048] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A double-acting pump for water bath heating, characterized in that: It comprises a frame (1), a linear drive mechanism (2), a pumping assembly (3) and a heating assembly (4), wherein the linear drive mechanism (2) is mounted on the frame (1); The pumping assembly (3) comprises a cylinder (31), a rod (32), a piston (33), a first one-way valve (34) and a second one-way valve (35); the cylinder (31) is mounted on the frame (1); the piston (33) is slidably connected in the cylinder (31); a first end of the rod (32) is fixedly connected to the piston (33); a second end of the rod (32) extends from one end of the cylinder (31) and is connected to an output end of the linear drive mechanism (2); and the piston (33) separates a rod chamber (311) and a rodless chamber (312) in the cylinder (31); The cylinder (31) is provided with a feed port (313) and a discharge port (314), the feed port (313) is communicated with the rodless cavity (312), and the discharge port (314) is communicated with the rod-containing cavity (311); The first one-way valve (34) is arranged on the piston (33) to allow the material in the rodless chamber (312) to flow unidirectionally to the rod chamber (311); The second one-way valve (35) is arranged at the feed port (313) on the cylinder (31) to allow the material to flow into the rodless chamber (312) in a one-way manner; The heating component (4) is arranged around the outside of the cylinder (31).

2. A double-acting pump for water bath heating according to claim 1, characterized in that: The heating component (4) comprises a sleeve (41), the sleeve (41) being sleeved outside the cylinder (31), and an annular heating chamber (43) being left between the sleeve (41) and the outer wall of the cylinder (31), and a first liquid inlet (411) and a first liquid outlet (412) being provided on the sleeve (41), and the first liquid inlet (411) and the first liquid outlet (412) are both in communication with the annular heating chamber (43).

3. A double-acting pump for water bath heating according to claim 2, characterized in that: The first liquid inlet (411) is arranged at one end close to the discharge port (314), and the first liquid outlet (412) is arranged at one end close to the feed port (313).

4. A double-acting pump for water bath heating according to claim 3, characterized in that: The flow cross section area of ​​the rodless cavity (312) is twice the flow cross section area of ​​the rod-containing cavity (311).

5. A double-acting pump for water bath heating according to any one of claims 1 to 4, characterized in that: A columnar heating chamber (321) is arranged in the rod body (32); a second liquid inlet (322) and a second liquid outlet (323) are arranged at one end of the rod body (32) away from the piston (33); and the second liquid inlet (322) and the second liquid outlet (323) are both in communication with the columnar heating chamber (321).

6. A double-acting pump for water bath heating according to claim 5, characterized in that: A flow guide tube (324) is provided in the columnar heating chamber (321); a first end of the flow guide tube (324) is connected to the second liquid outlet (323); a second end of the flow guide tube (324) extends in a direction close to the piston (33) and extends to the bottom of the columnar heating chamber (321).

7. A double-acting pump for water bath heating according to any one of claims 1 to 4, characterized in that: The linear drive mechanism (2) is a hydraulic cylinder or an electric push rod or a pneumatic cylinder.

8. A double-acting pump for water bath heating according to any one of claims 1 to 4, characterized in that: The first one-way valve (34) comprises a ball (341) and an elastic member (342); the piston (33) is provided with a receiving chamber (331), a main channel (332) and a branch channel (333); two ends of the main channel (332) are respectively connected to the rodless chamber (312) and the receiving chamber (331); two ends of the branch channel (333) are respectively connected to the rod chamber (311) and the receiving chamber (331); The spherical body (341) is arranged in the accommodating cavity (331), and the spherical body (341) abuts against the junction between the main flow channel (332) and the accommodating cavity (331); the elastic member (342) is arranged in the accommodating cavity (331), the first end of the elastic member (342) abuts against the spherical body (341), and the second end of the elastic member (342) abuts against the inner wall of the accommodating cavity (331); The diameter of the accommodating cavity (331) is greater than the diameter of the sphere (341), and the diameter of the main flow channel (332) is smaller than the diameter of the sphere (341).

9. A double-acting pump for water bath heating according to claim 8, characterized in that: A plurality of branch flow channels (333) are arranged, and the plurality of branch flow channels (333) are evenly distributed along the circumference of the piston (33).

10. A double-acting pump for water bath heating according to any one of claims 2 to 4, characterized in that: The heating component (4) further comprises a liquid distribution ring (42), wherein the liquid distribution ring (42) is arranged in the annular heating chamber (43) and the liquid distribution ring (42) is arranged around the cylinder (31); the liquid distribution ring (42) is hollow, and the first liquid inlet (411) is connected to the interior of the liquid distribution ring (42); a plurality of liquid distribution holes (421) are arranged at one end of the liquid distribution ring (42) close to the second one-way valve (35); the liquid distribution holes (421) connect the annular heating chamber (43) and the interior of the liquid distribution ring (42).

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