WO2018086136A1

WO2018086136A1 - Pressure stabilizing pump

Info

Publication number: WO2018086136A1
Application number: PCT/CN2016/105796
Authority: WO
Inventors: 罗凤玲
Original assignee: 惠州科赛医疗有限公司
Priority date: 2016-11-14
Filing date: 2016-11-14
Publication date: 2018-05-17

Abstract

A pressure stabilizing pump, comprising a pump body (10), a low pressure fluid valve (11), and a high pressure fluid valve (12). The pump body (10) comprises a first low pressure fluid inlet (101a), a second low pressure fluid inlet (101b), a first high pressure fluid outlet (102a), and a second high pressure fluid outlet (102b); the low pressure fluid valve (11) comprises a three-way low pressure valve body (111), a first low pressure fluid connector (112a), and a second low pressure fluid connector (112b); the high pressure fluid valve (12) comprises a three-way high pressure valve body (121), a first high pressure fluid connector (122a), and a second high pressure fluid connector (122b); the three-way low pressure valve body (111) is separately in transition fit and laser welded or in interference fit with the first low pressure fluid connector (112a) and the second low pressure fluid connector (112b); the three-way high pressure valve body (121) is separately in transition fit and laser welded with or in interference fit with the first high pressure fluid connector (122a) and the second high pressure fluid connector (122b). The low pressure fluid valve (11) and the high pressure fluid valve (12) of the pressure stabilizing pump are assembled from multiple elements, and thus if the low pressure fluid valve (11) or the high pressure fluid valve (12) is damaged, it is only needed to replace the damaged element without replacing a whole assembly.

Description

Constant pressure pump

Technical field

The invention relates to the technical field of pumps, in particular to a constant pressure pump and is applied to the medical field.

Background technique

Medical waterjet is a kind of surgical equipment that uses high-pressure water jet technology to selectively cut human tissue, can precisely protect blood vessels and nerves, and achieve minimally invasive surgery. Medical waterjet has been widely used in trauma surgery, otolaryngology Surgery, surgery such as maxillofacial surgery. The constant pressure pump is one of the core parts of the medical waterjet design. The constant pressure pump includes a single piston chamber and a double piston chamber. At present, the constant pressure pump of the double piston chamber is commonly used, and the switching of the double piston chamber is realized by means of an electromagnetic control valve and the like. The structure is complex and the cost is high. However, the structure of the current constant pressure pump is complicated. When the constant pressure pump is damaged, the whole set of the constant pressure pump must be replaced.

Summary of the invention

In view of the deficiencies in the prior art, it is an object of the present invention to provide a constant pressure pump.

In order to solve the above technical problem, the present application discloses a constant pressure pump, comprising: a pump body having a first low pressure fluid inlet, a second low pressure fluid inlet, a first high pressure fluid outlet, and a second high pressure fluid outlet, a first piston chamber and a second piston chamber, the first low pressure fluid inlet and the first high pressure fluid outlet are in communication with the first piston chamber, the second low pressure fluid inlet and the second high pressure fluid outlet are opposite to the first The two piston chambers are in communication, the first piston chamber and the second piston chamber are respectively provided with a piston structure; the low pressure fluid valve comprises a three-way low pressure valve body and a first low pressure fluid connection member connecting the three-way low pressure valve body And a second low pressure fluid connection, the first low pressure fluid connection and the second low pressure fluid connection respectively connecting the first low pressure fluid inlet and the second low pressure fluid inlet; and a high pressure fluid valve located at the low pressure fluid valve One side and including a three-way high pressure valve body and a first high pressure fluid connection member and a second high pressure fluid connection member connecting the three-way high pressure valve body, the first high pressure fluid connection And the second highest The pressure fluid connection member is respectively connected to the first high pressure fluid outlet and the second high pressure fluid outlet; wherein the three-way low pressure valve body respectively passes through a transition fit with the first low pressure fluid connection member and the second low pressure fluid connection member And a laser welding or interference fit connection, the first low pressure fluid connection and the first low pressure fluid inlet and the second low pressure fluid connection and the second low pressure fluid inlet are coupled and laser welded or interference fit Connecting, the three-way high-pressure valve body is respectively connected with the first high-pressure fluid connection member and the second high-pressure fluid connection member by a transient fit and a laser welding or an interference fit, the first high-pressure fluid connection member and the first The high pressure fluid outlet and the second high pressure fluid connection and the second high pressure fluid outlet are connected by a transition fit and a laser welding or an interference fit.

According to an embodiment of the present application, the three-way low pressure valve body has a first low pressure fluid end, a second low pressure fluid end, and a low pressure fluid inlet end, and the first low pressure valve core of the first low pressure fluid end a space and a second low pressure spool receiving space of the second low pressure fluid end are respectively in communication with the low pressure fluid inlet passage of the low pressure fluid inlet end; the first low pressure fluid connection and the second low pressure fluid The connecting members respectively have a first connecting end portion and a second connecting end portion, and the first connecting end portion of the first low-pressure fluid connecting member is connected with the first low-pressure fluid end portion of the three-way low-pressure valve body, and has The first low-pressure valve core accommodates a space-connecting sealed space, the second connecting end of which is connected to the first low-pressure fluid inlet, and has a low-pressure fluid passage connecting the sealed space and the first low-pressure fluid inlet; a first connecting end of the second low-pressure fluid connection member is connected to the second low-pressure fluid end of the three-way low-pressure valve body, and has a sealed space communicating with the second low-pressure valve core accommodating space, Connecting a second end connected to the low pressure fluid inlet and a low pressure fluid passage communication with the enclosed space and a first low pressure fluid inlet.

According to an embodiment of the present application, the first low pressure valve core accommodating space accommodates the first low pressure valve core and the first low pressure spring, and the first low pressure valve core abuts against the first low pressure valve core accommodating space a sidewall of one end, the first low-pressure spring abuts between the first low-pressure valve core and a sidewall of one end of the sealing space; the second low-pressure valve core accommodating space accommodates the second low-pressure valve core and a second low pressure spring, the second low pressure valve core abuts a side wall of one end of the second low pressure valve core accommodating space, the second low pressure spring abuts against the second low pressure valve core and the seal Between the side walls of one end of the space.

According to an embodiment of the present application, the first low pressure fluid end and the second low pressure fluid end respectively have connection bumps, and the first connection ends of the first low pressure fluid connection and the second low pressure fluid connection respectively respectively a connecting groove having a connecting bump of the first low-pressure fluid end and the second low-pressure fluid end respectively disposed at a connection of the first connecting end of the first low-pressure fluid connector and the second low-pressure fluid connector a second connecting end of the first low-pressure fluid connection member and the second low-pressure fluid connection member has a connection bump, and the second connection end portion of the first low-pressure fluid connection member and the second low-pressure fluid connection member The connecting bumps are respectively disposed at the first low pressure fluid inlet and the second low pressure fluid inlet.

According to an embodiment of the present application, the three-way low pressure valve body includes a first valve body and a second low pressure valve body screwed to the first low pressure valve body, and the first low pressure valve body has the first low pressure a fluid end and a second low pressure fluid end, the second low pressure valve body having a low pressure fluid inlet end.

According to an embodiment of the present application, an elastic sealing ring is disposed between the first low pressure valve body and the second low pressure valve body.

According to an embodiment of the present application, the three-way high pressure valve body has a first high pressure fluid end, a second high pressure fluid end, and a high pressure fluid outlet end, and the first high pressure fluid core has a first high pressure valve core capacity a second high pressure valve core accommodating space of the second high pressure fluid end portion and a high pressure fluid outlet passage of the high pressure fluid outlet end; the first high pressure fluid connection member and the second high pressure fluid The connecting members respectively have a first connecting end portion and a second connecting end portion, and the first connecting end portion of the first high-pressure fluid connecting member is connected to the first high-pressure fluid end portion of the three-way high-pressure valve body, and has The first high-pressure valve core accommodates a space-connecting sealed space, the second connecting end of which is connected to the first high-pressure fluid outlet, and has a high-pressure fluid passage connecting the sealed space and the first high-pressure fluid outlet; a first connecting end of the second high-pressure fluid connection member is connected to the second high-pressure fluid end of the three-way high-pressure valve body, and has a sealed space communicating with the second high-pressure valve core accommodating space, the Connecting a second end connected to the high pressure fluid outlet, and having a high pressure fluid passage communication with the enclosed space and a first outlet of the high pressure fluid.

According to an embodiment of the present application, the first valve core accommodating space accommodates a first high pressure valve core and a first high pressure spring, and the first high pressure valve core abuts at one end of the first high pressure valve core accommodating space Side a wall, the first high pressure spring abuts between the first high pressure valve core and a sidewall of one end of the sealing space; the second high pressure valve core accommodating space accommodates the second high pressure valve core and the second high pressure a spring, the second high pressure valve core abuts a side wall of one end of the second high pressure valve core accommodating space, and the second high pressure spring abuts the second high pressure valve core and one end of the sealed space Between the side walls.

According to an embodiment of the present application, the first high pressure fluid end and the second high pressure fluid end respectively have connection bumps, and the first connection ends of the first high pressure fluid connection and the second high pressure fluid connection respectively respectively a connecting groove having a connecting protrusion of the first high-pressure fluid end and the second high-pressure fluid end respectively disposed at a connection of the first connecting end of the first high-pressure fluid connecting member and the second high-pressure fluid connecting member a groove; the second connecting end of the first high pressure fluid connection and the second high pressure fluid connection has a connection bump, and the second connection end of the first high pressure fluid connection and the second high pressure fluid connection The connecting bumps are respectively disposed at the first high pressure fluid inlet and the second high pressure fluid inlet.

According to an embodiment of the present application, the three-way low-pressure valve body is respectively provided with an elastic sealing ring between the first low-pressure fluid connection member and the second low-pressure fluid connection member, and the first low-pressure fluid connection member and the first low-pressure fluid connection member An elastic sealing ring is disposed between the fluid inlet and the second low pressure fluid connection and the second low pressure fluid inlet, respectively, the three-way high pressure valve body and the first high pressure fluid connection and the second high pressure fluid connection An elastic sealing ring is disposed between the first high pressure fluid connection member and the first high pressure fluid outlet and the second high pressure fluid connection member and the second high pressure fluid outlet.

According to an embodiment of the present application, the pump body has two corresponding clamping slots, and the two clamping slots are arranged in a spiral

Compared with the prior art, the present application can obtain the following technical effects:

The low-pressure fluid valve and the high-pressure fluid valve of the steady-state pump of the present application are assembled by a plurality of components, and when the constant-pressure pump is damaged, the damaged component is replaced without a complete set replacement. In addition, the components are connected by means of a transition fit and laser welding, an interference fit or an elastic sealing ring, which effectively increases the sealing of the component assembly and avoids leakage of low pressure fluid or high pressure fluid from the component assembly. The pump body of the constant pressure pump of the present application is provided with two opposite clamping grooves, so that the pump body clamping device is stably fixed to the medical device by matching with the two clamping grooves of the pump body.

DRAWINGS

Fig. 1 is a perspective view of a constant pressure pump of a first embodiment of the present application.

Figure 2 is a first cross-sectional view of the steady-state pump of the first embodiment of the present application.

Fig. 3 is an enlarged view of a broken line portion of Fig. 2.

Figure 4 is a second cross-sectional view of the steady-state pump of the first embodiment of the present application.

Fig. 5 is an enlarged view of a broken line portion of Fig. 4.

Fig. 6 is a view showing a first use state of the low pressure fluid valve of the first embodiment of the present application.

Fig. 7a is a second use state diagram of the low pressure fluid valve of the first embodiment of the present application.

Fig. 7b is a first use state view of the high pressure fluid valve of the first embodiment of the present application.

Fig. 8a is a second use state diagram of the high pressure fluid valve of the first embodiment of the present application.

Fig. 8b is a third use state diagram of the low pressure fluid valve of the first embodiment of the present application.

FIG. 9a is a view showing a state of use of a Zener pump according to a first embodiment of the present application in a medical device.

Figure 9b is a partial cross-sectional view showing the Zener pump of the first embodiment of the present application disposed on a medical device.

Figure 10a is a first cross-sectional view of a constant pressure pump of a second embodiment of the present application.

Figure 10b is a second cross-sectional view of the constant pressure pump of the second embodiment of the present application.

detailed description

In the following, various embodiments of the present application are disclosed in the drawings. For the sake of clarity, the details of the invention are described in the following description. However, it should be understood that these practical details are not intended to limit the application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, some of the conventional structures and components are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

The use of "first", "second", etc., as used herein, does not specifically mean the order or order, and is not intended to limit the application, but merely to distinguish between components or operations described in the same technical terms. .

Please refer to FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 and FIG. 5 , which are a perspective view, a first cross-sectional view, an enlarged view of a broken line portion of FIG. 2 , and a second view of the constant pressure pump 1 of the first embodiment of the present application. The cross-sectional view and the enlarged view of the broken line portion of FIG. 4; as shown, the steady-state pump 1 of the present embodiment includes a pump body 10, a low-pressure fluid valve 11, and a high-pressure fluid valve 12. The pump body 10 has a first low pressure fluid inlet 101a, a second low pressure fluid inlet 101b, a first high pressure fluid outlet 102a, a second high pressure fluid outlet 102b, a first piston chamber 103a and a second piston chamber 103b, and a first low pressure fluid inlet 101a. And the second low pressure fluid inlet 101b is located at one side of the first piston chamber 103a and the second piston chamber 103b, and the first high pressure fluid outlet 102a and the second high pressure fluid outlet 102b are located at the other of the first piston chamber 103a and the second piston chamber 103b. On one side, the first piston chamber 103a corresponds to and communicates with the first low pressure fluid inlet 101a and the first high pressure fluid outlet 102a, and the second piston chamber 103b corresponds to and communicates with the second low pressure fluid inlet 101b and the second high pressure fluid outlet 102b. . A piston structure 1031 is installed in each of the first piston chamber 103a and the second piston chamber 103b.

The low pressure fluid valve 11 is connected to the first low pressure fluid inlet 101a and the second low pressure fluid inlet 101b, and includes a three-way low pressure valve body 111, a first low pressure fluid connection 112a and a second low pressure fluid connection 112b, three-way low pressure The valve body 111 connects the first low pressure fluid connection 112a and the first low pressure fluid connection 112b, and the first low pressure fluid connection 112a and the second low pressure fluid connection 112b are connected to the first low pressure fluid inlet 101a and the second low pressure fluid outlet 101b, respectively. . The three-way low pressure valve body 111 has a first low pressure fluid end portion 1111, a second low pressure fluid end portion 1112, and a low pressure fluid inlet end portion 1113. The first low pressure fluid end portion 1111 and the second low pressure fluid end portion 1112 of the present embodiment are mutually Correspondingly, the low pressure fluid inlet end 1113 is perpendicular to the first low pressure fluid end 1111 and the second low pressure fluid end 1112. The first low pressure fluid end 1111 has a first low pressure spool receiving space 1114, the second low pressure fluid end 1112 has a second low pressure spool receiving space 1115, and the low pressure fluid inlet end 1113 has a low pressure fluid inlet passage 1116. The fluid inlet channel 1116 is in communication with the first low pressure valve core accommodating space 1114 and the second low pressure valve core accommodating space 1115. The first low pressure valve core accommodating space 1114 is provided with a first low pressure valve core 113a and at the first low pressure. A first low pressure spring 114a on one side of the spool 113a, a second low pressure spool 113b and a second low pressure spring 114b at the second low pressure spool 113b are disposed in the second low pressure spool receiving space 1115.

The first low-pressure fluid connection 112a has a first connecting end portion 1121 and a second connecting end portion 1122, the first connecting end portion 1121 of which connects the first low-pressure fluid end portion 1111 of the three-way low-pressure valve body 111, and the second connecting end thereof The portion 1122 is connected to the first low pressure fluid inlet 101a of the pump body 10. The first connecting end portion 1121 has a closed space 1123. When the first connecting end portion 1121 is connected to the first low-pressure fluid end portion 1111, the closed space 1123 closes the first low-pressure valve core accommodating space 1114, and the first low-pressure valve core 113a and The first low pressure spring 114a is located in the first low pressure valve core accommodating space 1114 and the closed space 1123. The first low pressure valve core 113a is adjacent to the low pressure fluid inlet passage 1116. The first low pressure spring 114a is adjacent to the first low pressure fluid connection member 112a. One end of the low pressure spring 114a abuts against the side wall of one end of the closed space 1123, and the other end of the first low pressure spring 114a abuts against the first low pressure valve core 113a, so that the first low pressure valve core 113a abuts the low pressure fluid inlet passage 1116. The first low pressure valve core accommodates a side wall at one end of the space 1114 to block the communication between the low pressure fluid inlet passage 1116 and the first low pressure spool storage space 1114. The second connecting end 1122 of the first low pressure fluid connection 112a has a low pressure fluid passage 1124 that communicates with the sealed space 1123 and the first low pressure fluid inlet 101a.

The second low pressure fluid connection 112b of the present embodiment has the same structure as the first low pressure fluid connection 112a, and the second low pressure fluid connection 112b includes a first connection end 1121 having a sealed space 1123 and a low pressure fluid passage 1124. The second connecting end portion 1122 defines a second low pressure valve core 113b and a second low pressure spring 114b when the first connecting end portion 1121 of the second low pressure fluid connecting member 112b is connected to the second low pressure fluid end portion 1112. In the second low pressure valve core accommodating space 1115, the low pressure fluid passage 1124 communicates with the sealed space 1123 and the second low pressure fluid inlet 101b. The second low pressure valve core 113b and the second low pressure spring 114b of the present embodiment are symmetrically disposed with the first low pressure valve core 113a and the first low pressure spring 113b located in the first low pressure valve core accommodation space 1114, and also represent the second low pressure valve. The core 113b is adjacent to the low pressure fluid entering the flow path 1116, and the second low pressure spring 114b abuts between the second low pressure valve core 113b and the side wall of one end of the sealed space 1123, and the second low pressure valve core 113b abuts close to the low pressure fluid. The second low pressure spool of the flow passage 1116 accommodates a side wall of one end of the space 1115 to block the communication of the low pressure fluid into the flow passage 1116 and the second low pressure spool accommodation space 1115.

The high pressure fluid valve 12 is located at one side of the low pressure fluid valve 11 and is connected to the first high pressure fluid outlet 102a and a second high pressure fluid outlet 102b comprising a three-way high pressure valve body 121, a first high pressure fluid connection 122a and a second high pressure fluid connection 122b. The three-way high pressure valve body 121 connects the first high pressure fluid connection 122a and the second high pressure fluid connection 122b, and the first high pressure fluid connection 122a and the second high pressure fluid connection 122b are respectively connected to the first high pressure fluid outlet 102a and the second high pressure. Fluid outlet 102b. The three-way high pressure valve body 121 has a first high pressure fluid end portion 1211, a second high pressure fluid end portion 1212 and a high pressure fluid outlet end portion 1213. The first high pressure fluid end portion 1211 and the second high pressure fluid end portion 1212 of the present embodiment are mutually Correspondingly, the high pressure fluid outlet end portion 1213 is perpendicular to the first high pressure fluid end portion 1211 and the second high pressure fluid end portion 1212, and the first high pressure fluid end portion 1211 has a first high pressure valve core accommodation space 1214 and a second high pressure fluid end. The portion 1212 has a second high pressure valve core accommodating space 1215, and the high pressure fluid outlet end portion 1213 has a high pressure fluid outlet passage 1216, a high pressure fluid outlet passage 1216 and a first high pressure valve core accommodating space 1214 and a second high pressure valve core accommodating space. 1215 is connected. The first high pressure valve core 123a and the first high pressure spring 124a on the side of the first high pressure valve core 123a are disposed in the first high pressure valve core accommodating space 1214, and the second high pressure is disposed in the second high pressure valve core accommodating space 1215. The valve body 123b and the second high pressure spring 124b on the side of the first high pressure valve core 123b.

The first high pressure fluid connection 122a and the second high pressure fluid connection 122b have the same structure, and have a first connection end portion 1221 and a second connection end portion 1222, respectively. The first connecting end portion 1221 of the first high pressure fluid connecting member 122a is connected to the first high pressure fluid end portion 1211 of the three-way high pressure valve body 121, and the second connecting end portion 1222 is connected to the first high pressure fluid outlet portion 102a; likewise, the second The first connecting end portion 1221 of the high pressure fluid connection 122b is coupled to the second high pressure fluid end 1212 of the three-way high pressure valve body 121, and the second connecting end portion 1222 is coupled to the second high pressure fluid outlet 102b. The first connecting end portions 1221 of the first high-pressure fluid connecting member 122a and the second high-pressure fluid connecting member 122b respectively have a sealing space 1223, and the sealed space 1223 of the first high-pressure fluid connecting member 122a seals the first high-pressure valve core receiving space 1214. The sealing space 1223 of the second high-pressure fluid connecting member 122b seals the second high-pressure valve core accommodating space 1215, and the first high-pressure valve core 123a and the first high-pressure spring 124a are located in the first high-pressure valve core accommodating space 1214 and the sealed space 1223. The second high pressure valve core 123b and the second high pressure spring 124b are located in the second high pressure valve core accommodating space 1215 and the sealed space 1223. First high pressure fluid connection 122a and The second connecting end portions 1222 of the two high-pressure fluid connecting members 122b respectively have a high-pressure fluid passage 1224, and the high-pressure fluid passage 1224 of the first high-pressure fluid connecting member 122a communicates with the sealed space 1223 and the first high-pressure fluid outlet 102a, and the second high-pressure fluid connecting member The high pressure fluid passage 1224 of 122b communicates with the sealed space 1223 and the second high pressure flow outlet 102b. The first high pressure valve core 123a is adjacent to the high pressure fluid passage 1224 of the first high pressure fluid connection member 122a, and one end of the first high pressure spring 124a abuts the side of the first high pressure valve core accommodation space 1214 adjacent to the high pressure fluid outlet passage 1216. The one end of the wall abuts against the first high-pressure valve core 123a, so that the first high-pressure valve core 123a abuts against the side wall of one end of the sealed space 1223, and blocks the communication between the high-pressure fluid passage 1224 and the first high-pressure valve core accommodating space 1214. Similarly, the second high pressure valve core 123b is adjacent to the high pressure fluid passage 1224 of the second high pressure fluid connection 122b, and one end of the first high pressure spring 124b abuts against the second high pressure valve core accommodation space 1215 adjacent to the high pressure fluid outlet passage 1216. One end side wall has one end abutting against the second high pressure valve core 123b, so that the second high pressure valve core 123b abuts against the side wall of one end of the sealed space 1223, blocking the high pressure fluid passage 1224 and the second high pressure valve core accommodating space. 1215 connectivity.

As can be seen from the above, the low pressure fluid valve 11 of the present embodiment is composed of a three-way low pressure valve body 111, a first low pressure fluid connection member 112a and a second low pressure fluid connection member 112b. The high pressure fluid valve 12 is composed of a three-way high pressure valve body 121, A high pressure fluid connection member 122a and a second high pressure fluid connection member 122b are configured such that the low pressure fluid valve 11 and the high pressure fluid valve 12 are easily assembled, and when the low pressure fluid valve 11 or the high pressure fluid valve 12 is damaged, only the damaged component is replaced. , no need to replace the entire group.

Referring to FIG. 2 and FIG. 4, the first low-pressure fluid end portion 1111 and the second low-pressure fluid end portion 1112 of the three-way low-pressure valve body 111 of the low-pressure fluid valve 11 of the present embodiment respectively have connecting bumps 115, the first low-pressure fluid. The first connecting end portion 1121 of the connecting member 112a and the second low-pressure fluid connecting member 112b respectively have a connecting groove 1125, and the first low-pressure fluid end portion 1111 and the second low-pressure fluid end portion 1112 respectively and the first low-pressure fluid connecting member 112a When the first connecting end portion 1121 of the second low-pressure fluid connecting member 112b is connected, the connecting bumps 115 of the first low-pressure fluid end portion 1111 and the second low-pressure fluid end portion 1112 are respectively disposed on the first low-pressure fluid connecting member 112a and the first a connecting groove 1125 of the first connecting end portion 1121 of the low-pressure fluid connecting member 112b; a first low-pressure fluid connecting member 112a and a second low-pressure fluid The second connecting ends 1122 of the connecting members 112b respectively have connecting lugs 1126, and the second connecting ends 1122 of the first low-pressure fluid connecting member 112a and the second low-pressure fluid connecting member 112b are respectively connected to the first low-pressure fluid inlet 101a and the first The second low pressure fluid inlet 112a and the second connection end 1122 of the second low pressure fluid connection 112b are respectively disposed at the first low pressure fluid inlet 101a and the second low pressure fluid inlet 101b. .

Similarly, the first high pressure fluid end portion 1211 and the second high pressure fluid end portion 1212 of the three-way high pressure valve body 121 of the high pressure fluid valve 12 of the present embodiment respectively have a connection bump 125, a first high pressure fluid connection member 122a and a The first connecting end portions 1221 of the two high-pressure fluid connecting members 122b respectively have connecting grooves 1225, and the first high-pressure fluid end portion 1211 and the second high-pressure fluid end portion 1212 are respectively connected to the first high-pressure fluid connecting member 122a and the second high-pressure fluid. When the first connecting end portion 1221 of the connecting member 122b is connected, the connecting protrusions 125 of the first high-pressure fluid end portion 1211 and the second high-pressure fluid end portion 1212 are respectively disposed on the first high-pressure fluid connecting member 122a and the second high-pressure fluid connecting member. The connecting groove 1225 of the first connecting end portion 1221 of 122b; the first connecting end portion 1222 of the first high pressure fluid connecting piece 122a and the second high pressure fluid connecting piece 122b respectively have a connecting protrusion 1226 when the first high pressure fluid connecting piece The first high pressure fluid connection member 122a and the second high pressure flow when the second connection end portion 1222 of the 122a and the second high pressure fluid connection member 122b are connected to the first high pressure fluid outlet 102a and the second high pressure fluid outlet 102b, respectively. A second connecting member connecting end portions 122b 12261222 connection bumps are provided on the first high-pressure fluid outlet 102a and a second high pressure fluid outlet 102b.

In order to ensure the tightness of the connection between the components of the low pressure fluid valve 11 and the high pressure fluid valve 12, the first low pressure fluid end portion 1111 of the three-way low pressure valve body 111 of the low pressure fluid valve 11 of the present embodiment and the first low pressure fluid connection member 112a Between the first connection end portion 1121, the second low pressure fluid end portion 1112 of the three-way low pressure valve body 111 and the first connection end portion 1121 of the second low pressure fluid connection member 112a, the second of the first low pressure fluid connection member 112a Laser welding between the connecting end 1122 and the first low pressure fluid inlet 101a and between the second connecting end 1122 of the second low pressure fluid connection 112b and the second low pressure fluid inlet 101b prevents low pressure fluid from leaking therefrom; a first high pressure fluid end portion 1211 of the three-way high pressure valve body 121 of the high pressure fluid valve 12 and a first connection end portion of the first high pressure fluid connection member 122a 1221, the second high pressure fluid end 1212 of the three-way high pressure valve body 121 and the first connection end portion 1221 of the second high pressure fluid connection member 122a, the second connection end portion 1222 of the first high pressure fluid connection member 122a and the first A high pressure fluid inlet 102a and a second connecting end portion 1222 of the second high pressure fluid connection member 122b are laser welded to the second high pressure fluid inlet 102b so that high pressure fluid does not leak therebetween.

Please refer to FIG. 6 , FIG. 7 a , FIG. 7 b , FIG. 8 a and FIG. 8 b , which are a first use state diagram of the low pressure fluid valve 11 and a second use state diagram of the low pressure fluid valve 11 according to the first embodiment of the present application. A first usage state diagram of the high pressure fluid valve 12, a second usage state diagram of the high pressure fluid valve 12, and a third usage state diagram of the low pressure fluid valve 11; as shown, the mode of use of the steady pressure pump 1 of the present embodiment is The external fluid supply device connects the low pressure fluid of the three-way low pressure valve body 111 of the low pressure fluid valve 11 into the end portion 1113, and the external fluid supply device supplies the low pressure fluid to the low pressure fluid valve 11, which flows from the low pressure fluid inlet passage 1116 and simultaneously enters the first a low pressure valve core accommodating space 1114 and a second low pressure valve core accommodating space 1115, and the low pressure fluid pushes the first low pressure valve core 113a located in the first low pressure valve core accommodating space 1114 toward the first low pressure fluid connection member 112a and The second low pressure valve core 113b pushing the second low pressure valve core accommodating space 1115 is moved to the second low pressure fluid connection member 112b, the first low pressure valve core 113a is pressed against the first low pressure spring 114a, and the second low pressure valve core 113b is pressed Two low The compression spring 114b allows the low pressure fluid to enter the passage 1116, the first low pressure spool accommodation space 1114, the sealed space 1123 of the first low pressure fluid connection 112a, the low pressure fluid passage 1124 of the first low pressure fluid connection 112a, and the first low pressure fluid. The inlet 101a forms a passage, and the low pressure fluid flows from the first low pressure fluid inlet 101a into the first piston chamber 103a; likewise, the low pressure fluid enters the seal of the passage 1116, the second low pressure spool receiving space 1115, and the second low pressure fluid connecting member 112b. The space 1123, the low pressure fluid passage 1124 of the second low pressure fluid connection 112b and the first low pressure fluid inlet 101b form a passage from which the fluid flows from the first low pressure fluid inlet 101b into the second piston chamber 103b, such that the piston structure of the first piston chamber 103a When the piston structure 1031 of the 1031 and the second piston chamber 103b is not in operation, the fluid first fills the first piston chamber 103a and the second piston chamber 103b.

The piston structure 1031 in the first piston chamber 103a and the second piston chamber 103b starts to operate, when the piston structure 1031 of the first piston chamber 103a presses the low pressure fluid in the first piston chamber 103a, A high pressure fluid is generated in a piston chamber 103a. At this time, the high pressure fluid flows from the first low pressure fluid inlet 101a and the first high pressure fluid inlet 102a, and the high pressure fluid flowing into the first low pressure fluid inlet 101a pushes the first low pressure spool receiving space 1114. The first low pressure spool 113a moves toward the low pressure fluid inlet passage 1116, and the thrust of the high pressure fluid and the recovery of the compressed first low pressure spring 114a are greater than the thrust of the low pressure fluid flowing from the low pressure fluid inlet passage 1116, so the first The low pressure valve core 113a abuts against a side wall of one end of the first low pressure valve core accommodating space 1114 of the low pressure fluid inlet passage 1116, and the first low pressure valve core 113a blocks the low pressure fluid entering the passage 1116 and the first low pressure valve core accommodating space. In the communication of 1114, the low pressure fluid does not flow from the low pressure fluid inlet passage 1116 into the first low pressure spool accommodation space 1114, and the high pressure fluid does not flow from the first low pressure spool accommodation space 1114 to the low pressure fluid inlet passage 1116, the low pressure fluid Only the low pressure fluid inlet passage 1116 flows into the second low pressure spool receiving space 1115, the second low pressure fluid connecting member 112b, and the second low pressure fluid inlet. The port 101b and the second piston chamber 103b are as shown in Fig. 7a.

In addition, the high pressure fluid flows from the first high pressure fluid outlet 102a into the first high pressure valve core accommodating space 1214, and pushes the first high pressure valve core 123a to press the first high pressure spring 124a and move toward the high pressure fluid outlet passage 1216, the second high pressure fluid. The outlet 102a, the first high pressure fluid connection 122a, the first high pressure spool receiving space 1214, and the high pressure fluid outlet passage 1216 form a passage from which the high pressure fluid flows out, as shown in Figure 7b. When the high pressure fluid is generated in the second piston chamber 103b, the first piston chamber 103a stops supplying the high pressure fluid, and the elastic force generated by the extruded first high pressure spring 124a in the first high pressure valve core accommodation space 1214 pushes the first high pressure. The valve body 123a moves toward the first high-pressure fluid connection member 122a, so that the first high-pressure valve core 123a abuts against the side wall of one end of the sealed space 1213, and blocks the first high-pressure flow outlet port 102a and the first high-pressure valve core accommodation space 1214. Connected. The second piston chamber 103b supplies the high pressure fluid to the second low pressure valve core accommodating space 1115 and the second high pressure valve core accommodating space 1215 via the second low pressure fluid inlet 101b and the second high pressure fluid outlet 102b, and changes the second low pressure valve core 113b. And the position of the second high pressure valve core 123b, the second low pressure valve core 113b abuts the side wall adjacent to one end of the low pressure fluid inlet passage 1116, blocking the communication between the second low pressure valve core accommodation space 1115 and the low pressure fluid inlet passage 1116 , the low pressure fluid does not flow into the second low pressure spool accommodation space 1115, high pressure The fluid does not flow into the low pressure fluid inlet passage 1116; the second high pressure spool 123b is urged by the high pressure fluid to move toward the high pressure fluid outlet passage 1216, so that the second high pressure fluid outlet 102b, the second high pressure fluid connection 122b, and the second high pressure spool The accommodating space 1215 and the high pressure fluid outlet passage 1216 form a passage through which the high pressure fluid can flow out.

Referring to FIG. 3 and FIG. 5, the first low pressure valve core 113a, the second low pressure valve core 113b, the first high pressure valve core 123a and the second high pressure valve core 123b of the present embodiment are respectively solid spheres, and the first low pressure valve core is accommodated. The diameter of the space 1114, the second low-pressure valve core accommodating space 1115, the first high-pressure valve core accommodating space 1214, and the second high-pressure valve core accommodating space 1215 are larger than the first low-pressure valve core 113a and the second low-pressure valve core 113b, respectively. The diameters of the first high pressure valve core 123a and the second high pressure valve core 123b are such that the first low pressure valve core accommodation space 1114, the second low pressure valve core accommodation space 1115, the first high pressure valve core accommodation space 1214 and the second high pressure The spool receiving space 1215 accommodates the first low pressure valve core 113a, the second low pressure valve core 113b, the first high pressure valve core 123a, and the second high pressure valve core 123b, respectively. The diameters of the low-pressure fluid inlet passage 1116, the low-pressure fluid passage 1124, the high-pressure fluid outlet passage 1216, and the high-pressure fluid passage 1224 are respectively smaller than the first low-pressure valve core accommodation space 1114, the second low-pressure valve core accommodation space 1115, and the first high-pressure valve core. The diameters of the accommodating space 1214 and the second high pressure valve core accommodating space 1215 also indicate that the diameters of the low pressure fluid inlet passage 1116, the low pressure fluid passage 1124, the high pressure fluid outlet passage 1216, and the high pressure fluid passage 1224 are smaller than the first low pressure spool 113a, The diameters of the second low pressure valve core 113b, the first high pressure valve core 123a and the second high pressure valve core 123b, the first low pressure valve core 113a and the second low pressure valve core 113b can close the low pressure fluid inlet passage 1116 to avoid high pressure fluid from the low pressure fluid The inlet passage 1116 flows out, and the first high pressure spool 123a and the second high pressure spool 123b close the high pressure fluid passage 1224 to prevent low pressure fluid from flowing out of the high pressure fluid outflow passage 1216.

The first low pressure valve core 113a, the second low pressure valve core 113b, the first high pressure valve core 123a and the second high pressure valve core 123b of the embodiment may also be a hollow sphere, a solid cylinder, a hollow cylinder, a solid cylinder, and a hollow. a cylinder, a solid shaped body or a hollow shaped body, when the first low pressure valve core 113a, the second low pressure valve core 113b, the first high pressure valve core 123a and the second high pressure valve core 123b are spherical or curved bodies on both sides When the first low pressure valve core accommodates the side wall of the space 1114, the first low pressure fluid connection 112a and the a side wall of one end of the sealed space 1123 of the low-pressure fluid connecting member 112b, a side wall of one end of the second low-pressure valve core accommodating space 1115, a side wall of one end of the first high-pressure valve core accommodating space 1214, and a first high-pressure fluid connecting member 122a And a side wall of one end of the sealed space 1123 of the second high-pressure fluid connecting member 122b and a side wall of one end of the second high-pressure valve core accommodating space 1215 are inclined surfaces; when the first low-pressure valve core 113a, the second low-pressure valve core 113b, the first When the high pressure valve core 123a and the second high pressure valve core 123b are cylindrical bodies or irregular bodies having vertical planes on both sides, the side wall of one end of the first low pressure valve core accommodating space 1114, the first low pressure fluid connection member 112a and the second low pressure a side wall of one end of the sealed space 1123 of the fluid connecting member 112b, a side wall of one end of the second low-pressure valve core accommodating space 1115, a side wall of one end of the first high-pressure valve core accommodating space 1214, a first high-pressure fluid connecting member 122a and a The side wall of one end of the sealed space 1123 of the high-pressure fluid connecting member 122b and the side wall of one end of the second high-pressure valve core receiving space 1215 are vertical planes, so that the first low-pressure valve core 113a or the second low-pressure valve core 113b respectively abuts First low pressure spool The side wall of one end of the space 1114 or the side wall of one end of the second low pressure valve core accommodating space 1115, the first low pressure valve core 113a or the second low pressure valve core 113b can completely close the low pressure fluid inlet passage 1116 to prevent the high pressure fluid from flowing into the low pressure fluid. In the same manner, the first high pressure valve core 123a or the second high pressure valve core 123b respectively abuts the side wall of one end of the sealed space 1223 of the first high pressure fluid connection member 122a or the sealed space of the second high pressure fluid connection member 122b. The side wall of one end of 1223, the first high pressure valve core 123a or the second high pressure valve core 123b can completely close the high pressure fluid passage 1224 of the first high pressure fluid connection 122a or the high pressure fluid passage 1224 of the second high pressure fluid connection 122b, avoiding low pressure The fluid flows into the first high pressure spool receiving space 1214 or the second high pressure spool receiving space 1215.

Referring to FIG. 1 , the outer surface of the pump body 10 of the present embodiment has two opposite clamping slots 104 . The two clamping slots 104 are arranged on both sides of the pump body 10 and are arranged in a spiral. Please refer to FIG. 9 a and FIG. 9b is a view showing a use state and a partial cross-sectional view of the steady-state pump 1 of the first embodiment of the present application, which is disposed on the medical device 2; as shown, the steady-state pump 1 of the present embodiment passes the pump body clamping device. 3 is disposed in the medical device 2, the pump body clamping device 3 includes a fixing member 31, a rotating shaft 32, a follower member 33, a connecting rod 34 and a clamping ring 35. One end of the fixing member 31 has a pump body setting opening 311, and the rotating shaft 32 is disposed at the other end of the fixing member 31. The follower member 33 is disposed on the rotating shaft 32. The clamping ring 35 is sleeved on the fixing member 31. The clamping member 35 and the clamping ring 35 are pivotally connected to each other. The clamping ring 35 has two opposing clamping blocks 351. The two clamping blocks 351 are arranged in a spiral. The fixing member 31 of the pump body clamping device 3 is first fixed to the connecting portion 21 of the medical device 2, the clamping ring 35 is located between the fixing member 31 and the connecting portion 21, and then the pump body 10 of the constant pressure pump 1 is provided with the opening 311 from the pump body. When the rotating shaft 32 is rotated, the driven member 33 is rotated, and the follower 33 drives the clamping ring 35 to rotate through the connecting rod 34. The two clamping blocks 351 of the clamping ring 35 are engaged with the pump body 10. The clamping grooves 104 are used to stably fix the pump body 10 to the medical device 2 in such a manner as to prevent the pump body 10 from being detached from the medical device 2 during use.

Referring to Figures 2 and 4, the first low pressure fluid end 1111 of the three-way low pressure valve body 111 of the low pressure fluid valve 11 of the above embodiment and the connecting projection 115 of the second low pressure fluid end portion 1112 and the first low pressure fluid connection member The connection of the connection groove 1125 of the first connection end portion 1121 of the 112a and the second low-pressure fluid connection member 112b, and the connection of the second connection end portion 1122 of the first low-pressure fluid connection member 112a and the second low-pressure fluid connection member 112b Connection of the bump 1126 with the first low pressure fluid inlet 101a and the second low pressure fluid inlet 101b, and the connection bumps 125 of the first high pressure fluid end 1211 and the second high pressure fluid end 1212 and the first high pressure fluid connection 122a And a connection manner of the connection groove 1225 of the first connection end portion 1221 of the second high-pressure fluid connection member 122b, and a connection convexity of the second connection end portion 1222 of the first high-pressure fluid connection member 122a and the second high-pressure fluid connection member 122b The connection of the block 1226 with the first high pressure fluid outlet 102a and the second high pressure fluid outlet 102b is a transition fit and is connected by laser welding.

The first low pressure fluid end 1111 of the three-way low pressure valve body 111 of the low pressure fluid valve 11 of the above embodiment and the connection bump 115 of the second low pressure fluid end portion 1112 and the first low pressure fluid connection member 112a and the second low pressure fluid The connecting groove 1125 of the first connecting end portion 1121 of the connecting member 112b is connected, and the connecting bump 1126 of the first connecting end portion 1122 of the first low-pressure fluid connecting member 112a and the second low-pressure fluid connecting member 112b is first and first. The connection mode of the low pressure fluid inlet 101a and the second low pressure fluid inlet 101b, and the connection bumps 125 of the first high pressure fluid end portion 1211 and the second high pressure fluid end portion 1212 are fluidly connected to the first high pressure fluid connection member 122a and the second high pressure fluid. Connection manner of the connecting groove 1225 of the first connecting end portion 1221 of the member 122b, and the first high-pressure fluid connecting member 122a and the second high-voltage The connection manner of the connecting protrusion 1226 of the second connecting end portion 1222 of the fluid connecting member 122b and the first high-pressure fluid outlet 102a and the second high-pressure fluid outlet 102b can be connected by an interference fit, that is, the connecting bump 115 and the connection Between the grooves 1125, the connection bump 1126 and the first low pressure fluid inlet 101a between the second drip fluid inlet 101b, the connection bump 125 and the connection groove 1225, and the connection bump 1226 and the first high pressure fluid outlet 102a or The two high pressure fluid outlets 102b are hard sealed by a structure. Connection convexity of the connection bumps 115 of the first low-pressure fluid end 1111 and the second low-pressure fluid end 1112 of the present embodiment, the first low-pressure fluid connection 112a and the second connection end 1122 of the second low-pressure fluid connection 112b Block 1126, connecting bumps 125 of the first high pressure fluid end 1211 and the second high pressure fluid end 1212, and connecting bumps of the first connecting end portion 1222 of the first high pressure fluid connecting member 122a and the second high pressure fluid connecting member 122b 1226 is a cone. The connection between the components of the Zener pump 1 can also be well sealed by means of an interference fit.

Please refer to FIG. 10a and FIG. 10b, which are a first sectional view and a second sectional view of the constant pressure pump 1 of the second embodiment of the present application; as shown, the three-way low pressure valve body of the low pressure fluid valve 11 of the present embodiment is shown. The first low pressure fluid end 1111 of the 111 is connected to the first connection end 1121 of the first low pressure fluid connection 112a, and the first low pressure fluid end 1111 is disposed between the first connection end 1121 of the first low pressure fluid connection 112a. The elastic sealing ring 16 seals the connection gap between the first low pressure fluid end 1111 and the first connecting end 1121 of the first low pressure fluid connection 112a; similarly, the second low pressure fluid end 1112 and the second low pressure fluid connection Between the first connection ends 1121 of 112b, the second connection end 1122 of the first low pressure fluid connection 112a and the first low pressure fluid inlet 101a and the second connection end 1122 and the second of the second low pressure fluid connection 112b An elastic sealing ring 16 is respectively disposed between the low-pressure fluid inlets 101b to seal the second connection between the second low-pressure fluid end 1112 and the first connecting end portion 1121 of the second low-pressure fluid connecting member 112b and the first low-pressure fluid connecting member 112a. End 1122 and first low pressure fluid A second connecting end portion between the

ports

101a and 112b of the second pressure fluid connection to a second low pressure fluid 1122 between the inlet 101b.

Similarly, between the first high pressure fluid end portion 1211 of the three-way high pressure valve body 121 of the high pressure fluid valve 12 of the present embodiment and the first connection end portion 1221 of the first high pressure fluid connection member 122a, the second high pressure flow The body end portion 1212 is interposed between the first connection end portion 1221 of the second high pressure fluid connection member 122b, the second connection end portion 1222 of the first high pressure fluid connection member 122a and the first high pressure fluid outlet port 102a, and the second high pressure fluid connection member. An elastic sealing ring 16 is respectively disposed between the second connecting end portion 1222 of the 122b and the second high pressure fluid outlet port 102b to seal between the first high pressure fluid end portion 1211 and the first connecting end portion 1221 of the first high pressure fluid connecting member 122a. The second high pressure fluid end 1212 is interposed between the first connection end portion 1221 of the second high pressure fluid connection member 122b, the second connection end portion 1222 of the first high pressure fluid connection member 122a and the first high pressure fluid outlet port 102a and the second high pressure. The second connecting end 1222 of the fluid connection 122b is in communication with the second high pressure fluid outlet 102b. Thus, the three-way low pressure valve body 111 of the low pressure fluid valve 11 and the first low pressure fluid connection member 112a and the second low pressure fluid connection member 112b and the three-way high pressure valve body 121 of the high pressure fluid valve 12 and the first high pressure fluid connection member 122a are disposed. And a good seal between the second high pressure fluid connection 122b, the first low pressure fluid connection 112a and the second low pressure fluid connection 112b of the low pressure fluid valve 11 and the first low pressure fluid inlet 101a and the second low pressure fluid inlet 101b, respectively With good sealing, the first high pressure fluid connection 122a and the second high pressure fluid connection 122b of the high pressure fluid valve 12 have good sealing properties with the first high pressure fluid outlet 102a and the second high pressure fluid outlet 102b, respectively.

The first low-pressure fluid end 1111 of the three-way low-pressure valve body 111 of the low-pressure fluid valve 11 of the present embodiment and the connecting bump 115 of the second low-pressure fluid end 1112 are fluidly connected to the first low-pressure fluid connection member 112a and the second low-pressure fluid connection member 112a. The connecting groove 1125 of the first connecting end portion 1121 of the piece 112b is connected, and the connecting bump 1126 of the first connecting end portion 1122 of the first low-pressure fluid connecting piece 112a and the second low-pressure fluid connecting piece 112b is connected with the first low pressure The connection manner of the fluid inlet 101a and the second low pressure fluid inlet 101b, and the connection bumps 125 of the first high pressure fluid end portion 1211 and the second high pressure fluid end portion 1212 and the first high pressure fluid connection member 122a and the second high pressure fluid connection member The connection groove 1225 of the first connection end portion 1221 of 122b is connected, and the connection bump 1226 of the first connection end portion 1222 of the first high-pressure fluid connection member 122a and the second high-pressure fluid connection member 122b and the first high-pressure fluid The connection mode of the outlet 102a and the second high-pressure fluid outlet 102b can be a transition fit and connected by laser welding or interference fit, thus increasing the overall sealing performance of the constant pressure pump 1.

The three-way low pressure valve body 111 of the low pressure fluid valve 11 of the present embodiment includes a first low pressure valve body 111a and a second low pressure valve body 111b. The first low pressure valve body 111a includes a first low pressure fluid end portion 1111 and a second low pressure fluid. The end portion 1112, the second low pressure valve body 111b includes a low pressure fluid inlet end portion 1113, and the second low pressure valve body 111b is screwed to the first low pressure valve body 111a, and the first low pressure valve body 111a and the second low pressure valve body An elastic sealing ring 16 is disposed between the 111b, and the connection gap between the first low pressure valve body 111a and the second low pressure valve body 111b is sealed by the elastic sealing ring 16 to prevent low pressure fluid from flowing from the second low pressure valve body 111b to the first low pressure valve body 111a. The leakage from the first low pressure valve body 111a and the second low pressure valve body 111b.

In summary, the low-pressure fluid valve and the high-pressure fluid valve of the steady-state pump of the present application are assembled by a plurality of components. When the pressure-stabilizing pump is damaged, the damaged component is replaced without replacing the entire group. In addition, the components are connected by means of a transition fit and laser welding, an interference fit or an elastic sealing ring, which effectively increases the sealing of the component assembly and avoids leakage of low pressure fluid or high pressure fluid from the component assembly. The pump body of the constant pressure pump of the present application is provided with two opposite clamping grooves, so that the pump body clamping device is stably fixed to the medical device by matching with the two clamping grooves of the pump body.

The above description is only for the embodiments of the present application and is not intended to limit the application. Various changes and modifications can be made to the present application by those skilled in the art. Any modifications, equivalents, improvements, etc. made within the spirit and principles of the present application are intended to be included within the scope of the appended claims.

Claims

A constant pressure pump, comprising:

a pump body having a first low pressure fluid inlet, a second low pressure fluid inlet, a first high pressure fluid outlet, a second high pressure fluid outlet, a first piston chamber and a second piston chamber, the first low pressure fluid inlet and the first high pressure fluid The outlet is in communication with the first piston chamber, the second low pressure fluid inlet and the second high pressure fluid outlet are in communication with the second piston chamber, and the first piston chamber and the second piston chamber are respectively provided with a piston structure;

a low pressure fluid valve comprising a three-way low pressure valve body and a first low pressure fluid connection member and a second low pressure fluid connection member connecting the three-way low pressure valve body, the first low pressure fluid connection member and the second low pressure fluid connection member respectively Connecting the first low pressure fluid inlet and the second low pressure fluid inlet;

a high pressure fluid valve, located at one side of the low pressure fluid valve, and comprising a three-way high pressure valve body and a first high pressure fluid connection member and a second high pressure fluid connection member connecting the three-way high pressure valve body, the first high pressure The fluid connection member and the second high pressure fluid connection member are respectively connected to the first high pressure fluid outlet and the second high pressure fluid outlet;

Wherein the three-way low-pressure valve body is respectively connected with the first low-pressure fluid connection member and the second low-pressure fluid connection member by a transient fit and a laser welding or an interference fit, the first low-pressure fluid connection member and the first Connecting between the low pressure fluid inlet and the second low pressure fluid connection and the second low pressure fluid inlet by means of a hybrid and laser welding or interference fit, the three-way high pressure valve body and the first high pressure fluid connection and The second high pressure fluid connection is connected by a transition fit and a laser welding or an interference fit, and the transition between the first high pressure fluid connection and the first high pressure fluid outlet and between the second high pressure fluid connection and the second high pressure fluid outlet Fit and laser weld or interference fit.
The constant pressure pump according to claim 1, wherein said three-way low pressure valve body has a first low pressure fluid end, a second low pressure fluid end, and a low pressure fluid inlet end, said first low pressure fluid end a first low pressure valve core accommodating space of the portion and a second low pressure valve core accommodating space of the second low pressure fluid end portion respectively communicate with a low pressure fluid inlet passage of the low pressure fluid inlet end; the first low pressure Flow The body connecting member and the second low pressure fluid connecting member respectively have a first connecting end portion and a second connecting end portion, the first connecting end portion of the first low pressure fluid connecting member and the first low pressure of the three-way low pressure valve body a fluid end connected and having a sealed space in communication with the first low pressure spool housing space, the second connecting end connecting the first low pressure fluid inlet and having the sealed space and the first low pressure fluid a low pressure fluid passage of the inlet; a first connection end of the second low pressure fluid connection coupled to a second low pressure fluid end of the three-way low pressure valve body and having a second low pressure spool housing space A communicating sealed space having a second connecting end connected to the second low pressure fluid inlet and having a low pressure fluid passage communicating the sealed space and the first low pressure fluid inlet.
The constant pressure pump according to claim 2, wherein the first low pressure valve core accommodating space accommodates a first low pressure valve core and a first low pressure spring, and the first low pressure valve core abuts a first low-pressure valve core accommodating a side wall of one end of the space, the first low-pressure spring abutting between the first low-pressure valve core and a sidewall of one end of the sealed space; the second low-pressure valve core accommodating space Having a second low pressure valve core and a second low pressure spring, the second low pressure valve core abutting a side wall of one end of the second low pressure valve core accommodating space, the second low pressure spring abutting the first Two low pressure valve cores and a side wall of one end of the sealed space.
The constant pressure pump according to claim 2, wherein the first low pressure fluid end and the second low pressure fluid end respectively have connection bumps, the first low pressure fluid connection and the second low pressure fluid connection The first connecting ends of the pieces respectively have connecting grooves, and the connecting protrusions of the first low-pressure fluid end and the second low-pressure fluid end are respectively disposed on the first low-pressure fluid connecting member and the second low-pressure fluid connecting member a connection groove of the first connection end; the second connection end of the first low pressure fluid connection and the second low pressure fluid connection has a connection bump, the first low pressure fluid connection and the second low pressure fluid Connecting lugs of the second connecting end of the connecting member are respectively disposed at the first low pressure fluid inlet and the second low pressure fluid inlet.
The constant pressure pump according to claim 2, wherein the three-way low pressure valve body comprises a first valve body and a second low pressure valve body screwed to the first low pressure valve body, the first low pressure The valve body has the first low pressure fluid end and a second low pressure fluid end, the second low pressure valve body having a low pressure fluid inlet end.
The constant pressure pump according to claim 5, wherein an elastic sealing ring is disposed between the first low pressure valve body and the second low pressure valve body.
The constant pressure pump according to claim 1, wherein said three-way high pressure valve body has a first high pressure fluid end, a second high pressure fluid end, and a high pressure fluid outlet end, said first high pressure fluid end a first high pressure valve core accommodating space of the portion and a second high pressure valve core accommodating space of the second high pressure fluid end portion respectively communicate with a high pressure fluid outlet passage of the high pressure fluid outlet end; the first high pressure The fluid connection member and the second high pressure fluid connection member respectively have a first connection end portion and a second connection end portion, the first connection end portion of the first high pressure fluid connection member and the first high pressure of the three-way high pressure valve body a fluid end connected and having a sealed space in communication with the first high pressure spool accommodating space, the second connecting end connecting the first high pressure fluid outlet and having the sealed space and the first high pressure fluid a high pressure fluid passage of the outlet; the first connecting end of the second high pressure fluid connection is connected to the second high pressure fluid end of the three-way high pressure valve body, and has a space with the second high pressure valve core Connected a sealed space having a second connecting end connected to the second high pressure fluid outlet and having a high pressure fluid passage connecting the sealed space and the first high pressure fluid outlet.
The constant pressure pump according to claim 7, wherein the first valve core accommodating space houses a first high pressure valve core and a first high pressure spring, and the first high pressure valve core abuts against the first a high pressure valve core accommodating a side wall of one end of the space, the first high pressure spring abutting between the first high pressure valve core and a side wall of one end of the sealing space; the second high pressure valve core accommodating space a second high pressure valve core and a second high pressure spring, wherein the second high pressure valve core abuts against a side wall of one end of the second high pressure valve core accommodation space, and the second high pressure spring abuts against the second The high pressure valve core and the side wall of one end of the sealed space.
The constant pressure pump according to claim 7, wherein the first high pressure fluid end and the second high pressure fluid end respectively have connection bumps, the first high pressure fluid connection and the second high pressure fluid connection The first connecting ends of the pieces respectively have connecting grooves, and the connecting protrusions of the first high-pressure fluid end and the second high-pressure fluid end are respectively disposed on the first high-pressure fluid connecting member and the second high-pressure fluid connecting member a connecting groove of the first connecting end; the second connecting end of the first high pressure fluid connecting member and the second high pressure fluid connecting member has a connecting bump, the first high pressure fluid connecting member and the second high pressure fluid Connecting lugs of the second connecting end of the connecting member are respectively disposed at the first high pressure fluid inlet and the second high pressure fluid inlet.
The constant pressure pump according to any one of claims 1 to 9, wherein the three-way low-pressure valve body is provided with an elastic sealing ring between the first low-pressure fluid connection member and the second low-pressure fluid connection member, respectively. An elastic sealing ring is respectively disposed between the first low-pressure fluid connection member and the first low-pressure fluid inlet and between the second low-pressure fluid connection member and the second low-pressure fluid inlet, and the three-way high-pressure valve body respectively An elastic sealing ring is disposed between the first high pressure fluid connecting member and the second high pressure fluid connecting member, and the first high pressure fluid connecting member and the first high pressure fluid outlet and the second high pressure fluid connecting member and the second high pressure fluid outlet respectively With elastic sealing ring.
The constant pressure pump according to any one of claims 1 to 9, wherein the pump body has two corresponding clamping grooves, and the two clamping grooves are arranged in a spiral.