A refrigerant pump

Abstract

The application belongs to the technical field of pumps and discloses a refrigerant pump, which comprises a pump shell assembly, an impeller assembly is arranged rotatably in the pump shell assembly, an electromagnetic positive stop assembly is arranged at one end of the impeller assembly, and an electromagnetic reverse stop assembly is arranged at the other end of the impeller assembly. The bidirectional stop of the impeller assembly by the electromagnetic reverse stop assembly and the electromagnetic positive stop assembly avoids the continuous work of the impeller assembly on the cold liquid that is not discharged in time after the power-off of the pump shell assembly, thereby generating huge heat energy, and further causing deflagration or pressure increase. The pump is stopped, the impeller assembly is immediately stopped, when the pressure in the pump increases sharply, the high pressure in the pump pushes the arc-shaped buffer piston to slide to the top of the cylinder groove, so that the capacity of the pump shell is increased, the pressure of the pump body is instantaneously decompressed, and the annular buffer cylinder is provided with a plurality of cylinder grooves. The plurality of cylinder grooves serve as a plurality of independent buffer cavities and jointly play a protection role, and multi-point annular buffer pressure relief protection is realized.

Description

Technical Field

[0001] This invention belongs to the field of pump technology, and specifically relates to a refrigerant pump. Background Technology

[0002] In existing technologies, refrigerant pumps typically employ mechanical seals or electromagnetic clutches to brake the impeller during shutdown. However, these methods have the following main problems:

[0003] The impeller cannot stop immediately when the pump is shut down: After the power is cut off, the impeller of a traditional pump often continues to rotate due to inertia. Especially when there is residual cold liquid in the pump, the impeller continues to do work on the medium, which causes the local temperature to rise sharply. This may reach the ignition point of the refrigerant or lubricating oil, causing deflagration or explosion of the sealed cavity, which seriously threatens the safety of the system.

[0004] Lack of effective pressure buffering mechanism: When the system experiences a sudden increase in medium volume or pressure due to temperature changes or sudden changes in operating conditions, traditional pump structures often cannot accommodate or release the pressure in time, which can easily cause damage to the internal sealing structure of the pump body, cracking of the casing, or failure of connecting parts, affecting the service life of the pump and the stability of the system.

[0005] The buffer structure is simple and asynchronous: Although some existing pumps are equipped with buffer chambers or pressure relief devices, they are mostly single-point buffers with limited buffering capacity. Moreover, there is a lack of linkage mechanism between multiple buffer units, making it difficult to achieve synchronous operation and automatic reset, which affects the timeliness and uniformity of pressure release.

[0006] Therefore, there is an urgent need for a refrigerant pump that can achieve immediate bidirectional impeller stoppage during shutdown and has multi-point synchronous buffering capability to improve its operational safety and system reliability. Summary of the Invention

[0007] To address the problems mentioned in the background section, this invention provides a refrigerant pump with multi-point synchronous buffering capability.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a refrigerant pump, comprising a pump housing assembly, wherein an impeller assembly is rotatably disposed inside the pump housing assembly, an electromagnetic positive stop assembly is disposed at one end of the impeller assembly, and an electromagnetic negative stop assembly is disposed at the other end of the impeller assembly. The electromagnetic negative stop assembly and the electromagnetic positive stop assembly provide bidirectional stop to the impeller assembly, preventing the impeller assembly from generating enormous heat energy due to continuous work on the undischarged refrigerant after the pump housing assembly is de-energized, which could lead to deflagration or pressurization. Simultaneously, a pressurization self-buffering module is disposed in the middle of the pump housing assembly, which accommodates the expansion of the medium volume caused by temperature changes or pressure increases, preventing pressure shocks from damaging the internal sealing structure of the pump housing assembly.

[0009] In a preferred embodiment of a refrigerant pump, the pressurization self-buffering module includes a buffer cylinder assembly, a buffer piston assembly, and a buffer drive assembly;

[0010] The buffer cylinder assembly includes an annular buffer cylinder, which has multiple cylinder grooves on its upper ring and end rings fixedly installed on both sides of the annular buffer cylinder. A guide rail groove is opened at the top of the cylinder grooves. Multiple wall plates are fixedly installed on the outer wall of the annular buffer cylinder, and ring arms are fixedly installed on the wall plates. An arc-shaped abutment spring is sleeved on the ring arm.

[0011] The buffer piston assembly includes a drive arm, an arc-shaped buffer piston is fixedly disposed at the bottom of the drive arm, and a drive rod is fixedly disposed at the top of the drive arm;

[0012] The buffer drive assembly includes a slotted cross arm, and side ring disks are fixedly arranged on both sides of the slotted cross arm. Multiple drive arc grooves are opened on the side ring disks.

[0013] In a preferred embodiment of a refrigerant pump, the pump housing assembly includes a buffer housing, impeller housings are fixedly disposed on both sides of the buffer housing, an end cover housing is fixedly disposed on the side of the impeller housing away from the buffer housing, a drive motor is fixedly disposed at the end of one end cover housing, a base is fixedly disposed at the bottom of the impeller housing and the end cover housing, an inlet pipe and an outlet pipe are respectively disposed on the two impeller housings, and a guide rail groove is formed on the inner wall of the end cover housing, an electromagnet and a fixing block are fixedly disposed inside the guide rail groove.

[0014] In a preferred embodiment of a refrigerant pump, the impeller assembly includes an impeller shaft, with a positive ratchet and a negative ratchet fixedly disposed at both ends of the impeller shaft, and an impeller fixedly disposed in the middle of the impeller shaft.

[0015] In a preferred embodiment of a refrigerant pump, the electromagnetic positive stop assembly includes a stop ring and a stop gear. A guide rail slide is fixedly provided on the outer wall of the stop ring. Side ear plates are fixedly provided on both sides of the guide rail slide. An arc-shaped return spring and a powerful magnet are fixedly provided on both sides of the side ear plates. A gear support shaft and a stop pawl are fixedly provided on the stop gear.

[0016] In a preferred embodiment of a refrigerant pump, the side ring disc is rotatably mounted outside the end ring via a bearing, the grooved cross arm slides through the ring arm, and the two ends of the arc-shaped contact spring abut against the wall plate and the grooved cross arm respectively. Through the pushing action of the arc-shaped contact spring against the grooved cross arm, the side ring disc is in a clockwise rotational structure on the annular buffer cylinder.

[0017] In a preferred embodiment of a refrigerant pump, the drive arm slides through a guide rail groove on an annular buffer cylinder, the arc-shaped buffer piston moves within the cylinder groove, the drive rod is located outside the guide rail groove and is inserted into the drive arc groove, the buffer cylinder assembly, the buffer piston assembly, and the buffer drive assembly are disposed within a buffer housing, and the two end rings on both sides of the annular buffer cylinder are fixedly connected to the two impeller housings on both sides of the buffer housing.

[0018] In a preferred embodiment of a refrigerant pump, the impeller shaft is rotatably mounted in the impeller housing and the end cover housing via bearings. The impeller shaft is connected to the output shaft of the drive motor. The positive ratchet and the negative ratchet are rotatably mounted in the two end cover housings, respectively. The electromagnetic positive stop assembly is located outside the positive ratchet, and the electromagnetic negative stop assembly is located outside the negative ratchet.

[0019] In a preferred embodiment of a refrigerant pump, the stop gear ring rotates on the inner wall of the end cover housing via a guide rail slide and a guide rail groove. The stop gear is rotatably mounted on the end housing of the impeller housing via a gear support shaft and a bearing. The stop gear ring meshes with multiple stop gears. The two ends of the arc-shaped return spring are respectively fixed on the side ear plate and the fixing block. The powerful magnet and the electromagnet are arranged facing each other.

[0020] In a preferred embodiment of a refrigerant pump, the electromagnetic anti-stop assembly has the same structure as the electromagnetic positive stop assembly. The electromagnetic anti-stop assembly and the electromagnetic positive stop assembly are mirror images of each other at both ends of the impeller assembly. The connection structure of the electromagnetic anti-stop assembly in one end cover housing is the same as the connection structure of the electromagnetic positive stop assembly in the other end cover housing. The stop pawl engages with the positive ratchet.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The present invention has an impeller assembly rotatably mounted inside the pump casing assembly. One end of the impeller assembly is provided with an electromagnetic positive stop assembly, and the other end of the impeller assembly is provided with an electromagnetic negative stop assembly. Through the bidirectional stop of the impeller assembly by the electromagnetic negative stop assembly and the electromagnetic positive stop assembly, the impeller assembly is prevented from generating huge heat energy due to the impeller assembly continuously doing work on the cold liquid that has not been discharged in time after the pump casing assembly is de-energized, which could lead to deflagration or pressurization. This ensures that the impeller assembly stops immediately when the pump stops, thus avoiding the generation of huge heat energy or a surge in pressure inside the pump.

[0023] 2. The pump housing assembly of the present invention is provided with a pressure boosting self-buffering module in the middle of the housing. The pressure boosting self-buffering module is used to accommodate the expansion of the medium volume caused by temperature changes or pressure increases, and to prevent pressure shock from damaging the sealing structure inside the pump housing assembly. When the pressure inside the pump increases sharply, the high pressure inside the pump pushes the arc-shaped buffer piston to slide to the top of the cylinder groove, thereby increasing the capacity of the pump housing and realizing instantaneous pressure reduction of the pump body. At the same time, the annular buffer cylinder of the present invention is provided with multiple cylinder grooves on the upper ring. The multiple cylinder grooves serve as multiple independent buffer chambers to play a protective role, realizing multi-point ring buffering and pressure relief protection.

[0024] 3. The buffer cylinder assembly of the present invention is provided with a buffer drive assembly on its periphery. The reset driving force of multiple sets of buffer piston assemblies on the buffer cylinder assembly is provided by the arc-shaped contact spring. That is, the force of the arc-shaped contact spring is converted into the rotational force of the buffer drive assembly. The rotation of the buffer drive assembly drives multiple sets of buffer piston assemblies to move synchronously, thereby ensuring the synchronicity and self-resetting of the multi-point ring buffer depressurization protection structure. Attached Figure Description

[0025] Figure 1 This is an exploded view of the present invention;

[0026] Figure 2 This is a perspective view of the present invention;

[0027] Figure 3 This is a cross-sectional view of the pump housing assembly of the present invention;

[0028] Figure 4 This is a cross-sectional view of the end cap housing of the present invention;

[0029] Figure 5 This is a perspective view of the buffer cylinder assembly, buffer piston assembly, and buffer drive assembly of the present invention.

[0030] Figure 6 This is an exploded view of the buffer cylinder assembly, buffer piston assembly, and buffer drive assembly of the present invention.

[0031] Figure 7 This is a perspective view of the impeller assembly, electromagnetic anti-stop assembly, and electromagnetic positive stop assembly of the present invention;

[0032] Figure 8 This is a perspective view of the impeller assembly of the present invention;

[0033] Figure 9 This is a perspective view of the electromagnetic positive stop assembly of the present invention.

[0034] Explanation of reference numerals in the attached drawings: 100, Pump casing assembly; 101, Buffer housing; 102, Impeller housing; 103, Base; 104, End cover housing; 105, Drive motor; 106, Inlet pipe; 107, Outlet pipe; 108, Guide rail groove; 109, Electromagnet; 110, Fixing block; 200, Buffer cylinder assembly; 201, Annular buffer cylinder; 202, End ring; 203, Guide rail groove; 204, Cylinder groove; 205, Ring arm; 206, Arc-shaped contact spring; 207, Wall plate; 300, Buffer piston assembly; 301, Drive arm; 302... Drive rod; 303, arc-shaped buffer piston; 400, buffer drive assembly; 401, grooved cross arm; 402, side ring disc; 403, drive arc groove; 500, impeller assembly; 501, impeller shaft; 502, impeller; 503, positive ratchet; 504, negative ratchet; 600, electromagnetic anti-stop assembly; 700, electromagnetic positive stop assembly; 701, stop gear ring; 702, stop gear; 703, gear support shaft; 704, stop pawl; 705, guide rail slide; 706, arc-shaped return spring; 707, side ear plate; 708, powerful magnet. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-9 As shown, the present invention provides a refrigerant pump, including a pump housing assembly 100, an impeller assembly 500 rotatably disposed inside the pump housing assembly 100, an electromagnetic positive stop assembly 700 disposed at one end of the impeller assembly 500, and an electromagnetic negative stop assembly 600 disposed at the other end of the impeller assembly 500. The electromagnetic negative stop assembly 600 and the electromagnetic positive stop assembly 700 provide bidirectional stop for the impeller assembly 500, thereby preventing the impeller assembly 500 from generating huge heat energy due to continuous work on the refrigerant that has not been discharged in time after the pump housing assembly 100 is de-energized, which could lead to deflagration or pressurization. At the same time, a pressurization self-buffering module is disposed in the middle of the housing of the pump housing assembly 100, which accommodates the expansion of the medium volume caused by temperature changes or pressure increases, and prevents pressure shock from damaging the sealing structure inside the pump housing assembly 100.

[0037] The pressurized self-buffered module includes a buffer cylinder assembly 200, a buffer piston assembly 300, and a buffer drive assembly 400.

[0038] In a preferred embodiment, please refer to Figure 3 and Figure 4The pump housing assembly 100 includes a buffer housing 101. Impeller housings 102 are fixedly installed on both sides of the buffer housing 101. An end cover housing 104 is fixedly installed on the side of the impeller housing 102 away from the buffer housing 101. A drive motor 105 is fixedly installed at the end of one end cover housing 104. A base 103 is fixedly installed at the bottom of the impeller housing 102 and the end cover housing 104. An inlet pipe 106 and an outlet pipe 107 are respectively installed on the two impeller housings 102. A guide rail groove 108 is opened on the inner wall of the end cover housing 104. An electromagnet 109 and a fixing block 110 are fixedly installed inside the guide rail groove 108.

[0039] In this embodiment, the buffer cylinder assembly 200, the buffer piston assembly 300, and the buffer drive assembly 400 are disposed within the buffer housing 101.

[0040] In this embodiment, the structure of the electromagnetic anti-stop component 600 is the same as that of the electromagnetic positive stop component 700.

[0041] In this embodiment, the electromagnetic anti-stop component 600 and the electromagnetic positive stop component 700 are mirror images of each other at both ends of the impeller assembly 500.

[0042] In this embodiment, the connection structure of the electromagnetic anti-stop assembly 600 within one end cap housing 104 is consistent with the connection structure of the electromagnetic positive stop assembly 700 within the other end cap housing 104.

[0043] In a preferred embodiment, please refer to Figure 6 The buffer cylinder assembly 200 includes an annular buffer cylinder 201. The annular buffer cylinder 201 is provided with multiple cylinder grooves 204, and end rings 202 are fixedly provided on both sides of the annular buffer cylinder 201. A guide rail groove 203 is provided on the top of the cylinder grooves 204. Multiple wall plates 207 are fixedly provided on the outer wall of the annular buffer cylinder 201. A ring arm 205 is fixedly provided on the wall plate 207, and an arc-shaped abutment spring 206 is sleeved on the ring arm 205.

[0044] In this embodiment, the two ends of the arc-shaped abutment spring 206 abut against the wall plate 207 and the grooved cross arm 401, respectively.

[0045] In this embodiment, the two end rings 202 on both sides of the annular buffer cylinder 201 are fixedly connected to the two impeller housings 102 on both sides of the buffer housing 101.

[0046] In a preferred embodiment, please refer to Figure 6 The buffer piston assembly 300 includes a drive arm 301, an arc-shaped buffer piston 303 fixedly disposed at the bottom of the drive arm 301, and a drive rod 302 fixedly disposed at the top of the drive arm 301.

[0047] In this embodiment, the drive arm 301 slides through the guide rail groove 203 on the annular buffer cylinder 201.

[0048] In this embodiment, the arc-shaped buffer piston 303 moves within the cylinder groove 204.

[0049] In this embodiment, the drive rod 302 is located outside the guide rail groove 203.

[0050] In this embodiment, the drive rod 302 is inserted into the drive arc groove 403.

[0051] In a preferred embodiment, please refer to Figure 6 The buffer drive assembly 400 includes a grooved cross arm 401, with side ring disks 402 fixedly arranged on both sides of the grooved cross arm 401, and multiple drive arc grooves 403 opened on the side ring disks 402.

[0052] In this embodiment, the side ring disk 402 is rotatably disposed outside the end ring 202 via a bearing.

[0053] In this embodiment, the slotted cross arm 401 slides through the ring arm 205.

[0054] In this embodiment, the side ring disc 402 is rotated clockwise on the annular buffer cylinder 201 by the pushing of the arc-shaped contact spring 206 against the grooved cross arm 401.

[0055] In a preferred embodiment, please refer to Figure 8 The impeller assembly 500 includes an impeller shaft 501, with a positive ratchet 503 and a negative ratchet 504 fixedly installed at both ends of the impeller shaft 501, and an impeller 502 fixedly installed in the middle of the impeller shaft 501.

[0056] In this embodiment, the impeller shaft 501 is rotatably mounted within the impeller housing 102 and the end cover housing 104 via bearings.

[0057] In this embodiment, the impeller shaft 501 is connected to the output shaft of the drive motor 105.

[0058] In this embodiment, the positive ratchet 503 and the negative ratchet 504 are respectively rotatably disposed within the two end cap housings 104.

[0059] In this embodiment, the electromagnetic positive stop assembly 700 is disposed outside the positive ratchet 503.

[0060] In this embodiment, the electromagnetic anti-stop component 600 is disposed outside the anti-ratchet 504.

[0061] In a preferred embodiment, please refer to Figure 9The electromagnetic positive stop assembly 700 includes a stop ring 701 and a stop gear 702. A guide rail slide 705 is fixedly installed on the outer wall of the stop ring 701. Side ear plates 707 are fixedly installed on both sides of the guide rail slide 705. An arc-shaped return spring 706 and a strong magnet 708 are fixedly installed on both sides of the side ear plates 707 respectively. A gear support shaft 703 and a stop pawl 704 are fixedly installed on the stop gear 702.

[0062] In this embodiment, the stop ring 701 rotates on the inner wall of the end cover housing 104 via the guide rail slide 705 and the guide rail groove 108.

[0063] In this embodiment, the stop gear 702 is rotatably mounted on the end housing of the impeller housing 102 via the gear support rod 703 and the bearing.

[0064] In this embodiment, the stop ring 701 and a plurality of stop gears 702 mesh.

[0065] In this embodiment, the two ends of the arc-shaped return spring 706 are fixedly mounted on the side ear plate 707 and the fixing block 110, respectively.

[0066] In this embodiment, the powerful magnet 708 and the electromagnet 109 are positioned facing each other.

[0067] In this embodiment, the stop pawl 704 engages with the positive ratchet 503.

[0068] The working principle of this invention is as follows: When conveying cooling medium, if the pump operates at extremely low flow rate and near the shut-off point for an extended period, or if the pump fails to stop promptly after the outlet valve is mistakenly closed, the impeller inside the pump continues to perform work on the undischarged coolant, generating enormous heat energy. The sealed cooling medium trapped between the casing and the impeller is adiabatically compressed by the high-speed rotating impeller. Because it is conveying cooling medium with an extremely low initial temperature, under dynamic operating conditions, the compression ratio far exceeds the design value, causing the temperature to rise instantaneously to the auto-ignition point of the cooling medium, the flash point of the lubricating oil, or an increase in internal pressure, leading to deflagration within the sealed cavity, destroying the mechanical seal, the sealing cavity cover, etc. To solve the above problems, it is necessary to ensure that the impeller stops synchronously when the pump stops. Therefore, the impeller assembly 50 is rotatably installed inside the pump casing assembly 100 of this invention. 0. One end of the impeller assembly 500 is equipped with an electromagnetic positive stop component 700, and the other end is equipped with an electromagnetic negative stop component 600. The electromagnetic negative stop component 600 and the electromagnetic positive stop component 700 provide bidirectional stop for the impeller assembly 500, preventing the impeller assembly 500 from generating significant heat due to continuous work on the undischarged coolant after the pump housing assembly 100 is de-energized, which could lead to deflagration or pressurization. Specifically, when the drive motor 105 is energized and drives the impeller assembly 500 to rotate within the pump housing assembly 100, the electromagnet 109 is simultaneously energized. The magnetic force generated by the energized electromagnet 109 pushes the guide rail slide 705 to rotate clockwise within the guide rail groove 108 via the strong magnet 708. At this time, the guide rail slide 705 drives the stop teeth. When ring 701 rotates clockwise, the stop ring 701 meshes with the stop gear 702, causing the stop pawl 704 on the stop gear 702 to lift, thus disengaging the stop gear 702 from the positive ratchet 503. At this time, the impeller assembly 500 rotates normally within the pump housing assembly 100. When the pump housing assembly 100 is de-energized and stopped, the electromagnet 109 is de-energized and demagnetized. At this time, the push of the side ear plate 707 by the arc-shaped return spring 706 causes the guide rail slide 705 to drive the stop ring 701 to rotate counterclockwise on the inner wall of the end cover housing 104. At this time, the stop ring 701 meshes with the stop gear 702, causing the stop pawl 704 to move downward. When the stop pawl 704 moves downward, it meshes with the positive ratchet 503, thus disengaging the stop pawl. The engagement of 704 and the positive ratchet 503 ensures that the impeller assembly 500 can only rotate forward and not backward within the pump housing assembly 100. Simultaneously, the structure of the electromagnetic anti-stop component 600 is identical to that of the electromagnetic positive stop component 700. The electromagnetic anti-stop component 600 and the electromagnetic positive stop component 700 are mirror images of each other at both ends of the impeller assembly 500. The connection structure of the electromagnetic anti-stop component 600 within one end cover housing 104 is identical to the connection structure of the electromagnetic positive stop component 700 within the other end cover housing 104. The electromagnetic anti-stop component 600 is fitted onto the anti-ratchet 504. Through the cooperation of the electromagnetic anti-stop component 600 and the anti-ratchet 504, the impeller assembly 500 can only rotate backward and not forward within the pump housing assembly 100. That is, when the pump stops...The electromagnetic forward stop assembly 700 forms a stop structure for the impeller assembly 500, allowing only forward rotation and not reverse rotation. The electromagnetic reverse stop assembly 600 forms a stop structure for the impeller assembly 500, allowing only reverse rotation and not forward rotation. Through these structures, the impeller assembly 500 immediately stops when the pump stops, preventing the impeller from continuously performing work on the undischarged cold liquid, thus avoiding the generation of huge amounts of heat energy or a sharp increase in pump pressure.

[0069] Based on the above, in order to eliminate the potential danger of a sudden increase in pump pressure when the internal pressure or volume of the pump increases, a pressure-boosting self-buffering module is provided in the middle of the pump housing assembly 100 of this invention. This module accommodates the expansion of the medium volume caused by temperature changes or increased pressure, preventing pressure shocks from damaging the internal sealing structure of the pump housing assembly 100. Specifically, the buffer cylinder assembly 200, the buffer piston assembly 300, and the buffer drive assembly 400 are disposed within the buffer housing 101. The two end rings 202 on both sides of the annular buffer cylinder 201 are connected to the two impeller housings on both sides of the buffer housing 101. The body 102 is fixedly connected, and the drive arm 301 slides through the guide rail groove 203 on the annular buffer cylinder 201. The arc-shaped buffer piston 303 moves in the cylinder groove 204. In actual use, when the pressure inside the pump increases sharply, the high pressure inside the pump pushes the arc-shaped buffer piston 303 to slide towards the top of the cylinder groove 204, thereby increasing the capacity of the pump housing. In this way, the pressure of the pump body is reduced instantly. At the same time, the annular buffer cylinder 201 of this invention is provided with multiple cylinder grooves 204. The multiple cylinder grooves 204 serve as multiple independent buffer chambers to play a protective role, realizing multi-point ring buffer pressure relief protection.

[0070] Based on the above, in order to solve the problem of synchronous depressurization or synchronous reset of multiple sets of buffer piston assemblies 300 on the buffer cylinder assembly 200, a buffer drive assembly 400 is provided around the buffer cylinder assembly 200 of the present invention. In specific use, the side ring disc 402 is rotatably mounted outside the end ring 202 via bearings, the grooved cross arm 401 slides through the ring arm 205, and the two ends of the arc-shaped contact spring 206 abut against the wall plate 207 and the grooved cross arm 401 respectively. At the same time, the drive rod 302 is inserted into the drive arc groove 403. In actual use, the side ring disc 402 rotates clockwise on the annular buffer cylinder 201 by pushing the grooved cross arm 401 with the arc-shaped contact spring 206. When the side ring disc 402 rotates clockwise... The drive arc groove 403 on the side ring disc 402 moves the drive arm 301 downward in the guide rail groove 203 via the drive rod 302. At this time, the arc-shaped buffer piston 303 at the bottom of the drive arm 301 slides downward in the cylinder groove 204. In this way, the multiple sets of buffer piston assemblies 300 are reset on the buffer cylinder assembly 200. At the same time, the reset driving force of the multiple sets of buffer piston assemblies 300 on the buffer cylinder assembly 200 is provided by the arc-shaped resisting spring 206. That is, the force of the arc-shaped resisting spring 206 is converted into the rotational force of the buffer drive assembly 400. The rotation of the buffer drive assembly 400 drives the multiple sets of buffer piston assemblies 300 to move synchronously, thereby ensuring the synchronicity and self-resetting of the multi-point ring buffer depressurization protection structure.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A refrigerant pump, comprising a pump housing assembly (100), characterized in that: An impeller assembly (500) is rotatably mounted inside the pump housing assembly (100). An electromagnetic positive stop assembly (700) is provided at one end of the impeller assembly (500), and an electromagnetic negative stop assembly (600) is provided at the other end of the impeller assembly (500). The electromagnetic negative stop assembly (600) and the electromagnetic positive stop assembly (700) provide bidirectional stop to the impeller assembly (500), preventing the impeller assembly (500) from generating huge heat energy due to continuous work on the cold liquid that has not been discharged in time after the pump housing assembly (100) is de-energized, which could lead to deflagration or pressurization. At the same time, a pressurization self-buffering module is provided in the middle of the pump housing assembly (100) housing. The pressurization self-buffering module is used to accommodate the expansion of the medium volume caused by temperature changes or pressure increases, and to prevent pressure shock from damaging the sealing structure inside the pump housing assembly (100).

2. A refrigerant pump according to claim 1, characterized in that: The pressurized self-buffering module includes a buffer cylinder assembly (200), a buffer piston assembly (300), and a buffer drive assembly (400). The buffer cylinder assembly (200) includes an annular buffer cylinder (201), which has multiple cylinder grooves (204) on its upper ring and end rings (202) fixedly installed on both sides of the annular buffer cylinder (201). The top of the cylinder grooves (204) is provided with guide rail grooves (203). Multiple wall plates (207) are fixedly installed on the outer wall of the annular buffer cylinder (201). Ring arms (205) are fixedly installed on the wall plates (207), and arc-shaped abutment springs (206) are sleeved on the ring arms (205). The buffer piston assembly (300) includes a drive arm (301), an arc-shaped buffer piston (303) is fixedly disposed at the bottom of the drive arm (301), and a drive rod (302) is fixedly disposed at the top of the drive arm (301). The buffer drive assembly (400) includes a slotted cross arm (401), and side ring disks (402) are fixedly provided on both sides of the slotted cross arm (401). Multiple drive arc grooves (403) are opened on the side ring disks (402).

3. A refrigerant pump according to claim 2, characterized in that: The pump housing assembly (100) includes a buffer housing (101), and impeller housings (102) are fixedly provided on both sides of the buffer housing (101). An end cover housing (104) is fixedly provided on the side of the impeller housing (102) away from the buffer housing (101). A drive motor (105) is fixedly provided at the end of one end cover housing (104). A base (103) is fixedly provided at the bottom of the impeller housing (102) and the end cover housing (104). An inlet pipe (106) and an outlet pipe (107) are respectively provided on the two impeller housings (102). A guide rail groove (108) is opened on the inner wall of the end cover housing (104). An electromagnet (109) and a fixing block (110) are fixedly provided inside the guide rail groove (108).

4. A refrigerant pump according to claim 3, characterized in that: The impeller assembly (500) includes an impeller shaft (501), with a positive ratchet (503) and a negative ratchet (504) fixedly disposed at both ends of the impeller shaft (501), and an impeller (502) fixedly disposed in the middle of the impeller shaft (501).

5. A refrigerant pump according to claim 4, characterized in that: The electromagnetic positive stop assembly (700) includes a stop ring (701) and a stop gear (702). A guide rail slide (705) is fixedly provided on the outer wall of the stop ring (701). Side ear plates (707) are fixedly provided on both sides of the guide rail slide (705). An arc-shaped return spring (706) and a strong magnet (708) are fixedly provided on both sides of the side ear plate (707). A gear support shaft (703) and a stop pawl (704) are fixedly provided on the stop gear (702).

6. A refrigerant pump according to claim 5, characterized in that: The side ring disc (402) is rotatably mounted outside the end ring (202) via a bearing. The grooved cross arm (401) slides through the ring arm (205). The two ends of the arc-shaped abutment spring (206) abut against the wall plate (207) and the grooved cross arm (401) respectively. Through the pushing of the grooved cross arm (401) by the arc-shaped abutment spring (206), the side ring disc (402) is in a clockwise rotation structure on the annular buffer cylinder (201).

7. A refrigerant pump according to claim 5, characterized in that: The drive arm (301) slides through the guide rail groove (203) on the annular buffer cylinder (201). The arc-shaped buffer piston (303) moves in the cylinder groove (204). The drive rod (302) is located outside the guide rail groove (203) and is inserted in the drive arc groove (403). The buffer cylinder assembly (200), the buffer piston assembly (300), and the buffer drive assembly (400) are arranged in the buffer housing (101). The two end rings (202) on both sides of the annular buffer cylinder (201) are fixedly connected to the two impeller housings (102) on both sides of the buffer housing (101).

8. A refrigerant pump according to claim 5, characterized in that: The impeller shaft (501) is rotatably mounted in the impeller housing (102) and the end cover housing (104) via bearings. The impeller shaft (501) is connected to the output shaft of the drive motor (105). The positive ratchet (503) and the negative ratchet (504) are rotatably mounted in the two end cover housings (104) respectively. The electromagnetic positive stop assembly (700) is located outside the positive ratchet (503), and the electromagnetic negative stop assembly (600) is located outside the negative ratchet (504).

9. A refrigerant pump according to claim 5, characterized in that: The stop ring (701) rotates on the inner wall of the end cover housing (104) via the guide rail slide (705) and the guide rail groove (108). The stop gear (702) is rotatably mounted on the end housing of the impeller housing (102) via the gear support rod (703) and the bearing. The stop ring (701) meshes with multiple stop gears (702). The two ends of the arc-shaped return spring (706) are fixedly mounted on the side ear plate (707) and the fixing block (110) respectively. The strong magnet (708) and the electromagnet (109) are arranged facing each other.

10. A refrigerant pump according to claim 5, characterized in that: The structure of the electromagnetic anti-stop assembly (600) is the same as that of the electromagnetic positive stop assembly (700). The electromagnetic anti-stop assembly (600) and the electromagnetic positive stop assembly (700) are mirror images of each other and are arranged at both ends of the impeller assembly (500). The connection structure of the electromagnetic anti-stop assembly (600) in one end cover housing (104) is the same as the connection structure of the electromagnetic positive stop assembly (700) in the other end cover housing (104). The stop pawl (704) engages with the positive ratchet (503).

Images